diff options
119 files changed, 46657 insertions, 56 deletions
diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX index 7e17712..74052d2 100644 --- a/Documentation/filesystems/00-INDEX +++ b/Documentation/filesystems/00-INDEX @@ -12,10 +12,14 @@ cifs.txt - description of the CIFS filesystem coda.txt - description of the CODA filesystem. +configfs/ + - directory containing configfs documentation and example code. cramfs.txt - info on the cram filesystem for small storage (ROMs etc) devfs/ - directory containing devfs documentation. +dlmfs.txt + - info on the userspace interface to the OCFS2 DLM. ext2.txt - info, mount options and specifications for the Ext2 filesystem. hpfs.txt @@ -30,6 +34,8 @@ ntfs.txt - info and mount options for the NTFS filesystem (Windows NT). proc.txt - info on Linux's /proc filesystem. +ocfs2.txt + - info and mount options for the OCFS2 clustered filesystem. romfs.txt - Description of the ROMFS filesystem. smbfs.txt diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt new file mode 100644 index 0000000..c4ff96b --- /dev/null +++ b/Documentation/filesystems/configfs/configfs.txt @@ -0,0 +1,434 @@ + +configfs - Userspace-driven kernel object configuation. + +Joel Becker <joel.becker@oracle.com> + +Updated: 31 March 2005 + +Copyright (c) 2005 Oracle Corporation, + Joel Becker <joel.becker@oracle.com> + + +[What is configfs?] + +configfs is a ram-based filesystem that provides the converse of +sysfs's functionality. Where sysfs is a filesystem-based view of +kernel objects, configfs is a filesystem-based manager of kernel +objects, or config_items. + +With sysfs, an object is created in kernel (for example, when a device +is discovered) and it is registered with sysfs. Its attributes then +appear in sysfs, allowing userspace to read the attributes via +readdir(3)/read(2). It may allow some attributes to be modified via +write(2). The important point is that the object is created and +destroyed in kernel, the kernel controls the lifecycle of the sysfs +representation, and sysfs is merely a window on all this. + +A configfs config_item is created via an explicit userspace operation: +mkdir(2). It is destroyed via rmdir(2). The attributes appear at +mkdir(2) time, and can be read or modified via read(2) and write(2). +As with sysfs, readdir(3) queries the list of items and/or attributes. +symlink(2) can be used to group items together. Unlike sysfs, the +lifetime of the representation is completely driven by userspace. The +kernel modules backing the items must respond to this. + +Both sysfs and configfs can and should exist together on the same +system. One is not a replacement for the other. + +[Using configfs] + +configfs can be compiled as a module or into the kernel. You can access +it by doing + + mount -t configfs none /config + +The configfs tree will be empty unless client modules are also loaded. +These are modules that register their item types with configfs as +subsystems. Once a client subsystem is loaded, it will appear as a +subdirectory (or more than one) under /config. Like sysfs, the +configfs tree is always there, whether mounted on /config or not. + +An item is created via mkdir(2). The item's attributes will also +appear at this time. readdir(3) can determine what the attributes are, +read(2) can query their default values, and write(2) can store new +values. Like sysfs, attributes should be ASCII text files, preferably +with only one value per file. The same efficiency caveats from sysfs +apply. Don't mix more than one attribute in one attribute file. + +Like sysfs, configfs expects write(2) to store the entire buffer at +once. When writing to configfs attributes, userspace processes should +first read the entire file, modify the portions they wish to change, and +then write the entire buffer back. Attribute files have a maximum size +of one page (PAGE_SIZE, 4096 on i386). + +When an item needs to be destroyed, remove it with rmdir(2). An +item cannot be destroyed if any other item has a link to it (via +symlink(2)). Links can be removed via unlink(2). + +[Configuring FakeNBD: an Example] + +Imagine there's a Network Block Device (NBD) driver that allows you to +access remote block devices. Call it FakeNBD. FakeNBD uses configfs +for its configuration. Obviously, there will be a nice program that +sysadmins use to configure FakeNBD, but somehow that program has to tell +the driver about it. Here's where configfs comes in. + +When the FakeNBD driver is loaded, it registers itself with configfs. +readdir(3) sees this just fine: + + # ls /config + fakenbd + +A fakenbd connection can be created with mkdir(2). The name is +arbitrary, but likely the tool will make some use of the name. Perhaps +it is a uuid or a disk name: + + # mkdir /config/fakenbd/disk1 + # ls /config/fakenbd/disk1 + target device rw + +The target attribute contains the IP address of the server FakeNBD will +connect to. The device attribute is the device on the server. +Predictably, the rw attribute determines whether the connection is +read-only or read-write. + + # echo 10.0.0.1 > /config/fakenbd/disk1/target + # echo /dev/sda1 > /config/fakenbd/disk1/device + # echo 1 > /config/fakenbd/disk1/rw + +That's it. That's all there is. Now the device is configured, via the +shell no less. + +[Coding With configfs] + +Every object in configfs is a config_item. A config_item reflects an +object in the subsystem. It has attributes that match values on that +object. configfs handles the filesystem representation of that object +and its attributes, allowing the subsystem to ignore all but the +basic show/store interaction. + +Items are created and destroyed inside a config_group. A group is a +collection of items that share the same attributes and operations. +Items are created by mkdir(2) and removed by rmdir(2), but configfs +handles that. The group has a set of operations to perform these tasks + +A subsystem is the top level of a client module. During initialization, +the client module registers the subsystem with configfs, the subsystem +appears as a directory at the top of the configfs filesystem. A +subsystem is also a config_group, and can do everything a config_group +can. + +[struct config_item] + + struct config_item { + char *ci_name; + char ci_namebuf[UOBJ_NAME_LEN]; + struct kref ci_kref; + struct list_head ci_entry; + struct config_item *ci_parent; + struct config_group *ci_group; + struct config_item_type *ci_type; + struct dentry *ci_dentry; + }; + + void config_item_init(struct config_item *); + void config_item_init_type_name(struct config_item *, + const char *name, + struct config_item_type *type); + struct config_item *config_item_get(struct config_item *); + void config_item_put(struct config_item *); + +Generally, struct config_item is embedded in a container structure, a +structure that actually represents what the subsystem is doing. The +config_item portion of that structure is how the object interacts with +configfs. + +Whether statically defined in a source file or created by a parent +config_group, a config_item must have one of the _init() functions +called on it. This initializes the reference count and sets up the +appropriate fields. + +All users of a config_item should have a reference on it via +config_item_get(), and drop the reference when they are done via +config_item_put(). + +By itself, a config_item cannot do much more than appear in configfs. +Usually a subsystem wants the item to display and/or store attributes, +among other things. For that, it needs a type. + +[struct config_item_type] + + struct configfs_item_operations { + void (*release)(struct config_item *); + ssize_t (*show_attribute)(struct config_item *, + struct configfs_attribute *, + char *); + ssize_t (*store_attribute)(struct config_item *, + struct configfs_attribute *, + const char *, size_t); + int (*allow_link)(struct config_item *src, + struct config_item *target); + int (*drop_link)(struct config_item *src, + struct config_item *target); + }; + + struct config_item_type { + struct module *ct_owner; + struct configfs_item_operations *ct_item_ops; + struct configfs_group_operations *ct_group_ops; + struct configfs_attribute **ct_attrs; + }; + +The most basic function of a config_item_type is to define what +operations can be performed on a config_item. All items that have been +allocated dynamically will need to provide the ct_item_ops->release() +method. This method is called when the config_item's reference count +reaches zero. Items that wish to display an attribute need to provide +the ct_item_ops->show_attribute() method. Similarly, storing a new +attribute value uses the store_attribute() method. + +[struct configfs_attribute] + + struct configfs_attribute { + char *ca_name; + struct module *ca_owner; + mode_t ca_mode; + }; + +When a config_item wants an attribute to appear as a file in the item's +configfs directory, it must define a configfs_attribute describing it. +It then adds the attribute to the NULL-terminated array +config_item_type->ct_attrs. When the item appears in configfs, the +attribute file will appear with the configfs_attribute->ca_name +filename. configfs_attribute->ca_mode specifies the file permissions. + +If an attribute is readable and the config_item provides a +ct_item_ops->show_attribute() method, that method will be called +whenever userspace asks for a read(2) on the attribute. The converse +will happen for write(2). + +[struct config_group] + +A config_item cannot live in a vaccum. The only way one can be created +is via mkdir(2) on a config_group. This will trigger creation of a +child item. + + struct config_group { + struct config_item cg_item; + struct list_head cg_children; + struct configfs_subsystem *cg_subsys; + struct config_group **default_groups; + }; + + void config_group_init(struct config_group *group); + void config_group_init_type_name(struct config_group *group, + const char *name, + struct config_item_type *type); + + +The config_group structure contains a config_item. Properly configuring +that item means that a group can behave as an item in its own right. +However, it can do more: it can create child items or groups. This is +accomplished via the group operations specified on the group's +config_item_type. + + struct configfs_group_operations { + struct config_item *(*make_item)(struct config_group *group, + const char *name); + struct config_group *(*make_group)(struct config_group *group, + const char *name); + int (*commit_item)(struct config_item *item); + void (*drop_item)(struct config_group *group, + struct config_item *item); + }; + +A group creates child items by providing the +ct_group_ops->make_item() method. If provided, this method is called from mkdir(2) in the group's directory. The subsystem allocates a new +config_item (or more likely, its container structure), initializes it, +and returns it to configfs. Configfs will then populate the filesystem +tree to reflect the new item. + +If the subsystem wants the child to be a group itself, the subsystem +provides ct_group_ops->make_group(). Everything else behaves the same, +using the group _init() functions on the group. + +Finally, when userspace calls rmdir(2) on the item or group, +ct_group_ops->drop_item() is called. As a config_group is also a +config_item, it is not necessary for a seperate drop_group() method. +The subsystem must config_item_put() the reference that was initialized +upon item allocation. If a subsystem has no work to do, it may omit +the ct_group_ops->drop_item() method, and configfs will call +config_item_put() on the item on behalf of the subsystem. + +IMPORTANT: drop_item() is void, and as such cannot fail. When rmdir(2) +is called, configfs WILL remove the item from the filesystem tree +(assuming that it has no children to keep it busy). The subsystem is +responsible for responding to this. If the subsystem has references to +the item in other threads, the memory is safe. It may take some time +for the item to actually disappear from the subsystem's usage. But it +is gone from configfs. + +A config_group cannot be removed while it still has child items. This +is implemented in the configfs rmdir(2) code. ->drop_item() will not be +called, as the item has not been dropped. rmdir(2) will fail, as the +directory is not empty. + +[struct configfs_subsystem] + +A subsystem must register itself, ususally at module_init time. This +tells configfs to make the subsystem appear in the file tree. + + struct configfs_subsystem { + struct config_group su_group; + struct semaphore su_sem; + }; + + int configfs_register_subsystem(struct configfs_subsystem *subsys); + void configfs_unregister_subsystem(struct configfs_subsystem *subsys); + + A subsystem consists of a toplevel config_group and a semaphore. +The group is where child config_items are created. For a subsystem, +this group is usually defined statically. Before calling +configfs_register_subsystem(), the subsystem must have initialized the +group via the usual group _init() functions, and it must also have +initialized the semaphore. + When the register call returns, the subsystem is live, and it +will be visible via configfs. At that point, mkdir(2) can be called and +the subsystem must be ready for it. + +[An Example] + +The best example of these basic concepts is the simple_children +subsystem/group and the simple_child item in configfs_example.c It +shows a trivial object displaying and storing an attribute, and a simple +group creating and destroying these children. + +[Hierarchy Navigation and the Subsystem Semaphore] + +There is an extra bonus that configfs provides. The config_groups and +config_items are arranged in a hierarchy due to the fact that they +appear in a filesystem. A subsystem is NEVER to touch the filesystem +parts, but the subsystem might be interested in this hierarchy. For +this reason, the hierarchy is mirrored via the config_group->cg_children +and config_item->ci_parent structure members. + +A subsystem can navigate the cg_children list and the ci_parent pointer +to see the tree created by the subsystem. This can race with configfs' +management of the hierarchy, so configfs uses the subsystem semaphore to +protect modifications. Whenever a subsystem wants to navigate the +hierarchy, it must do so under the protection of the subsystem +semaphore. + +A subsystem will be prevented from acquiring the semaphore while a newly +allocated item has not been linked into this hierarchy. Similarly, it +will not be able to acquire the semaphore while a dropping item has not +yet been unlinked. This means that an item's ci_parent pointer will +never be NULL while the item is in configfs, and that an item will only +be in its parent's cg_children list for the same duration. This allows +a subsystem to trust ci_parent and cg_children while they hold the +semaphore. + +[Item Aggregation Via symlink(2)] + +configfs provides a simple group via the group->item parent/child +relationship. Often, however, a larger environment requires aggregation +outside of the parent/child connection. This is implemented via +symlink(2). + +A config_item may provide the ct_item_ops->allow_link() and +ct_item_ops->drop_link() methods. If the ->allow_link() method exists, +symlink(2) may be called with the config_item as the source of the link. +These links are only allowed between configfs config_items. Any +symlink(2) attempt outside the configfs filesystem will be denied. + +When symlink(2) is called, the source config_item's ->allow_link() +method is called with itself and a target item. If the source item +allows linking to target item, it returns 0. A source item may wish to +reject a link if it only wants links to a certain type of object (say, +in its own subsystem). + +When unlink(2) is called on the symbolic link, the source item is +notified via the ->drop_link() method. Like the ->drop_item() method, +this is a void function and cannot return failure. The subsystem is +responsible for responding to the change. + +A config_item cannot be removed while it links to any other item, nor +can it be removed while an item links to it. Dangling symlinks are not +allowed in configfs. + +[Automatically Created Subgroups] + +A new config_group may want to have two types of child config_items. +While this could be codified by magic names in ->make_item(), it is much +more explicit to have a method whereby userspace sees this divergence. + +Rather than have a group where some items behave differently than +others, configfs provides a method whereby one or many subgroups are +automatically created inside the parent at its creation. Thus, +mkdir("parent) results in "parent", "parent/subgroup1", up through +"parent/subgroupN". Items of type 1 can now be created in +"parent/subgroup1", and items of type N can be created in +"parent/subgroupN". + +These automatic subgroups, or default groups, do not preclude other +children of the parent group. If ct_group_ops->make_group() exists, +other child groups can be created on the parent group directly. + +A configfs subsystem specifies default groups by filling in the +NULL-terminated array default_groups on the config_group structure. +Each group in that array is populated in the configfs tree at the same +time as the parent group. Similarly, they are removed at the same time +as the parent. No extra notification is provided. When a ->drop_item() +method call notifies the subsystem the parent group is going away, it +also means every default group child associated with that parent group. + +As a consequence of this, default_groups cannot be removed directly via +rmdir(2). They also are not considered when rmdir(2) on the parent +group is checking for children. + +[Committable Items] + +NOTE: Committable items are currently unimplemented. + +Some config_items cannot have a valid initial state. That is, no +default values can be specified for the item's attributes such that the +item can do its work. Userspace must configure one or more attributes, +after which the subsystem can start whatever entity this item +represents. + +Consider the FakeNBD device from above. Without a target address *and* +a target device, the subsystem has no idea what block device to import. +The simple example assumes that the subsystem merely waits until all the +appropriate attributes are configured, and then connects. This will, +indeed, work, but now every attribute store must check if the attributes +are initialized. Every attribute store must fire off the connection if +that condition is met. + +Far better would be an explicit action notifying the subsystem that the +config_item is ready to go. More importantly, an explicit action allows +the subsystem to provide feedback as to whether the attibutes are +initialized in a way that makes sense. configfs provides this as +committable items. + +configfs still uses only normal filesystem operations. An item is +committed via rename(2). The item is moved from a directory where it +can be modified to a directory where it cannot. + +Any group that provides the ct_group_ops->commit_item() method has +committable items. When this group appears in configfs, mkdir(2) will +not work directly in the group. Instead, the group will have two +subdirectories: "live" and "pending". The "live" directory does not +support mkdir(2) or rmdir(2) either. It only allows rename(2). The +"pending" directory does allow mkdir(2) and rmdir(2). An item is +created in the "pending" directory. Its attributes can be modified at +will. Userspace commits the item by renaming it into the "live" +directory. At this point, the subsystem recieves the ->commit_item() +callback. If all required attributes are filled to satisfaction, the +method returns zero and the item is moved to the "live" directory. + +As rmdir(2) does not work in the "live" directory, an item must be +shutdown, or "uncommitted". Again, this is done via rename(2), this +time from the "live" directory back to the "pending" one. The subsystem +is notified by the ct_group_ops->uncommit_object() method. + + diff --git a/Documentation/filesystems/configfs/configfs_example.c b/Documentation/filesystems/configfs/configfs_example.c new file mode 100644 index 0000000..f3c6e49 --- /dev/null +++ b/Documentation/filesystems/configfs/configfs_example.c @@ -0,0 +1,474 @@ +/* + * vim: noexpandtab ts=8 sts=0 sw=8: + * + * configfs_example.c - This file is a demonstration module containing + * a number of configfs subsystems. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <linux/configfs.h> + + + +/* + * 01-childless + * + * This first example is a childless subsystem. It cannot create + * any config_items. It just has attributes. + * + * Note that we are enclosing the configfs_subsystem inside a container. + * This is not necessary if a subsystem has no attributes directly + * on the subsystem. See the next example, 02-simple-children, for + * such a subsystem. + */ + +struct childless { + struct configfs_subsystem subsys; + int showme; + int storeme; +}; + +struct childless_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct childless *, char *); + ssize_t (*store)(struct childless *, const char *, size_t); +}; + +static inline struct childless *to_childless(struct config_item *item) +{ + return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct childless, subsys) : NULL; +} + +static ssize_t childless_showme_read(struct childless *childless, + char *page) +{ + ssize_t pos; + + pos = sprintf(page, "%d\n", childless->showme); + childless->showme++; + + return pos; +} + +static ssize_t childless_storeme_read(struct childless *childless, + char *page) +{ + return sprintf(page, "%d\n", childless->storeme); +} + +static ssize_t childless_storeme_write(struct childless *childless, + const char *page, + size_t count) +{ + unsigned long tmp; + char *p = (char *) page; + + tmp = simple_strtoul(p, &p, 10); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + if (tmp > INT_MAX) + return -ERANGE; + + childless->storeme = tmp; + + return count; +} + +static ssize_t childless_description_read(struct childless *childless, + char *page) +{ + return sprintf(page, +"[01-childless]\n" +"\n" +"The childless subsystem is the simplest possible subsystem in\n" +"configfs. It does not support the creation of child config_items.\n" +"It only has a few attributes. In fact, it isn't much different\n" +"than a directory in /proc.\n"); +} + +static struct childless_attribute childless_attr_showme = { + .attr = { .ca_owner = THIS_MODULE, .ca_name = "showme", .ca_mode = S_IRUGO }, + .show = childless_showme_read, +}; +static struct childless_attribute childless_attr_storeme = { + .attr = { .ca_owner = THIS_MODULE, .ca_name = "storeme", .ca_mode = S_IRUGO | S_IWUSR }, + .show = childless_storeme_read, + .store = childless_storeme_write, +}; +static struct childless_attribute childless_attr_description = { + .attr = { .ca_owner = THIS_MODULE, .ca_name = "description", .ca_mode = S_IRUGO }, + .show = childless_description_read, +}; + +static struct configfs_attribute *childless_attrs[] = { + &childless_attr_showme.attr, + &childless_attr_storeme.attr, + &childless_attr_description.attr, + NULL, +}; + +static ssize_t childless_attr_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct childless *childless = to_childless(item); + struct childless_attribute *childless_attr = + container_of(attr, struct childless_attribute, attr); + ssize_t ret = 0; + + if (childless_attr->show) + ret = childless_attr->show(childless, page); + return ret; +} + +static ssize_t childless_attr_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct childless *childless = to_childless(item); + struct childless_attribute *childless_attr = + container_of(attr, struct childless_attribute, attr); + ssize_t ret = -EINVAL; + + if (childless_attr->store) + ret = childless_attr->store(childless, page, count); + return ret; +} + +static struct configfs_item_operations childless_item_ops = { + .show_attribute = childless_attr_show, + .store_attribute = childless_attr_store, +}; + +static struct config_item_type childless_type = { + .ct_item_ops = &childless_item_ops, + .ct_attrs = childless_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct childless childless_subsys = { + .subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "01-childless", + .ci_type = &childless_type, + }, + }, + }, +}; + + +/* ----------------------------------------------------------------- */ + +/* + * 02-simple-children + * + * This example merely has a simple one-attribute child. Note that + * there is no extra attribute structure, as the child's attribute is + * known from the get-go. Also, there is no container for the + * subsystem, as it has no attributes of its own. + */ + +struct simple_child { + struct config_item item; + int storeme; +}; + +static inline struct simple_child *to_simple_child(struct config_item *item) +{ + return item ? container_of(item, struct simple_child, item) : NULL; +} + +static struct configfs_attribute simple_child_attr_storeme = { + .ca_owner = THIS_MODULE, + .ca_name = "storeme", + .ca_mode = S_IRUGO | S_IWUSR, +}; + +static struct configfs_attribute *simple_child_attrs[] = { + &simple_child_attr_storeme, + NULL, +}; + +static ssize_t simple_child_attr_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + ssize_t count; + struct simple_child *simple_child = to_simple_child(item); + + count = sprintf(page, "%d\n", simple_child->storeme); + + return count; +} + +static ssize_t simple_child_attr_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct simple_child *simple_child = to_simple_child(item); + unsigned long tmp; + char *p = (char *) page; + + tmp = simple_strtoul(p, &p, 10); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + if (tmp > INT_MAX) + return -ERANGE; + + simple_child->storeme = tmp; + + return count; +} + +static void simple_child_release(struct config_item *item) +{ + kfree(to_simple_child(item)); +} + +static struct configfs_item_operations simple_child_item_ops = { + .release = simple_child_release, + .show_attribute = simple_child_attr_show, + .store_attribute = simple_child_attr_store, +}; + +static struct config_item_type simple_child_type = { + .ct_item_ops = &simple_child_item_ops, + .ct_attrs = simple_child_attrs, + .ct_owner = THIS_MODULE, +}; + + +static struct config_item *simple_children_make_item(struct config_group *group, const char *name) +{ + struct simple_child *simple_child; + + simple_child = kmalloc(sizeof(struct simple_child), GFP_KERNEL); + if (!simple_child) + return NULL; + + memset(simple_child, 0, sizeof(struct simple_child)); + + config_item_init_type_name(&simple_child->item, name, + &simple_child_type); + + simple_child->storeme = 0; + + return &simple_child->item; +} + +static struct configfs_attribute simple_children_attr_description = { + .ca_owner = THIS_MODULE, + .ca_name = "description", + .ca_mode = S_IRUGO, +}; + +static struct configfs_attribute *simple_children_attrs[] = { + &simple_children_attr_description, + NULL, +}; + +static ssize_t simple_children_attr_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + return sprintf(page, +"[02-simple-children]\n" +"\n" +"This subsystem allows the creation of child config_items. These\n" +"items have only one attribute that is readable and writeable.\n"); +} + +static struct configfs_item_operations simple_children_item_ops = { + .show_attribute = simple_children_attr_show, +}; + +/* + * Note that, since no extra work is required on ->drop_item(), + * no ->drop_item() is provided. + */ +static struct configfs_group_operations simple_children_group_ops = { + .make_item = simple_children_make_item, +}; + +static struct config_item_type simple_children_type = { + .ct_item_ops = &simple_children_item_ops, + .ct_group_ops = &simple_children_group_ops, + .ct_attrs = simple_children_attrs, +}; + +static struct configfs_subsystem simple_children_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "02-simple-children", + .ci_type = &simple_children_type, + }, + }, +}; + + +/* ----------------------------------------------------------------- */ + +/* + * 03-group-children + * + * This example reuses the simple_children group from above. However, + * the simple_children group is not the subsystem itself, it is a + * child of the subsystem. Creation of a group in the subsystem creates + * a new simple_children group. That group can then have simple_child + * children of its own. + */ + +struct simple_children { + struct config_group group; +}; + +static struct config_group *group_children_make_group(struct config_group *group, const char *name) +{ + struct simple_children *simple_children; + + simple_children = kmalloc(sizeof(struct simple_children), + GFP_KERNEL); + if (!simple_children) + return NULL; + + memset(simple_children, 0, sizeof(struct simple_children)); + + config_group_init_type_name(&simple_children->group, name, + &simple_children_type); + + return &simple_children->group; +} + +static struct configfs_attribute group_children_attr_description = { + .ca_owner = THIS_MODULE, + .ca_name = "description", + .ca_mode = S_IRUGO, +}; + +static struct configfs_attribute *group_children_attrs[] = { + &group_children_attr_description, + NULL, +}; + +static ssize_t group_children_attr_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + return sprintf(page, +"[03-group-children]\n" +"\n" +"This subsystem allows the creation of child config_groups. These\n" +"groups are like the subsystem simple-children.\n"); +} + +static struct configfs_item_operations group_children_item_ops = { + .show_attribute = group_children_attr_show, +}; + +/* + * Note that, since no extra work is required on ->drop_item(), + * no ->drop_item() is provided. + */ +static struct configfs_group_operations group_children_group_ops = { + .make_group = group_children_make_group, +}; + +static struct config_item_type group_children_type = { + .ct_item_ops = &group_children_item_ops, + .ct_group_ops = &group_children_group_ops, + .ct_attrs = group_children_attrs, +}; + +static struct configfs_subsystem group_children_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "03-group-children", + .ci_type = &group_children_type, + }, + }, +}; + +/* ----------------------------------------------------------------- */ + +/* + * We're now done with our subsystem definitions. + * For convenience in this module, here's a list of them all. It + * allows the init function to easily register them. Most modules + * will only have one subsystem, and will only call register_subsystem + * on it directly. + */ +static struct configfs_subsystem *example_subsys[] = { + &childless_subsys.subsys, + &simple_children_subsys, + &group_children_subsys, + NULL, +}; + +static int __init configfs_example_init(void) +{ + int ret; + int i; + struct configfs_subsystem *subsys; + + for (i = 0; example_subsys[i]; i++) { + subsys = example_subsys[i]; + + config_group_init(&subsys->su_group); + init_MUTEX(&subsys->su_sem); + ret = configfs_register_subsystem(subsys); + if (ret) { + printk(KERN_ERR "Error %d while registering subsystem %s\n", + ret, + subsys->su_group.cg_item.ci_namebuf); + goto out_unregister; + } + } + + return 0; + +out_unregister: + for (; i >= 0; i--) { + configfs_unregister_subsystem(example_subsys[i]); + } + + return ret; +} + +static void __exit configfs_example_exit(void) +{ + int i; + + for (i = 0; example_subsys[i]; i++) { + configfs_unregister_subsystem(example_subsys[i]); + } +} + +module_init(configfs_example_init); +module_exit(configfs_example_exit); +MODULE_LICENSE("GPL"); diff --git a/Documentation/filesystems/dlmfs.txt b/Documentation/filesystems/dlmfs.txt new file mode 100644 index 0000000..9afab84 --- /dev/null +++ b/Documentation/filesystems/dlmfs.txt @@ -0,0 +1,130 @@ +dlmfs +================== +A minimal DLM userspace interface implemented via a virtual file +system. + +dlmfs is built with OCFS2 as it requires most of its infrastructure. + +Project web page: http://oss.oracle.com/projects/ocfs2 +Tools web page: http://oss.oracle.com/projects/ocfs2-tools +OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/ + +All code copyright 2005 Oracle except when otherwise noted. + +CREDITS +======= + +Some code taken from ramfs which is Copyright (C) 2000 Linus Torvalds +and Transmeta Corp. + +Mark Fasheh <mark.fasheh@oracle.com> + +Caveats +======= +- Right now it only works with the OCFS2 DLM, though support for other + DLM implementations should not be a major issue. + +Mount options +============= +None + +Usage +===== + +If you're just interested in OCFS2, then please see ocfs2.txt. The +rest of this document will be geared towards those who want to use +dlmfs for easy to setup and easy to use clustered locking in +userspace. + +Setup +===== + +dlmfs requires that the OCFS2 cluster infrastructure be in +place. Please download ocfs2-tools from the above url and configure a +cluster. + +You'll want to start heartbeating on a volume which all the nodes in +your lockspace can access. The easiest way to do this is via +ocfs2_hb_ctl (distributed with ocfs2-tools). Right now it requires +that an OCFS2 file system be in place so that it can automatically +find it's heartbeat area, though it will eventually support heartbeat +against raw disks. + +Please see the ocfs2_hb_ctl and mkfs.ocfs2 manual pages distributed +with ocfs2-tools. + +Once you're heartbeating, DLM lock 'domains' can be easily created / +destroyed and locks within them accessed. + +Locking +======= + +Users may access dlmfs via standard file system calls, or they can use +'libo2dlm' (distributed with ocfs2-tools) which abstracts the file +system calls and presents a more traditional locking api. + +dlmfs handles lock caching automatically for the user, so a lock +request for an already acquired lock will not generate another DLM +call. Userspace programs are assumed to handle their own local +locking. + +Two levels of locks are supported - Shared Read, and Exlcusive. +Also supported is a Trylock operation. + +For information on the libo2dlm interface, please see o2dlm.h, +distributed with ocfs2-tools. + +Lock value blocks can be read and written to a resource via read(2) +and write(2) against the fd obtained via your open(2) call. The +maximum currently supported LVB length is 64 bytes (though that is an +OCFS2 DLM limitation). Through this mechanism, users of dlmfs can share +small amounts of data amongst their nodes. + +mkdir(2) signals dlmfs to join a domain (which will have the same name +as the resulting directory) + +rmdir(2) signals dlmfs to leave the domain + +Locks for a given domain are represented by regular inodes inside the +domain directory. Locking against them is done via the open(2) system +call. + +The open(2) call will not return until your lock has been granted or +an error has occurred, unless it has been instructed to do a trylock +operation. If the lock succeeds, you'll get an fd. + +open(2) with O_CREAT to ensure the resource inode is created - dlmfs does +not automatically create inodes for existing lock resources. + +Open Flag Lock Request Type +--------- ----------------- +O_RDONLY Shared Read +O_RDWR Exclusive + +Open Flag Resulting Locking Behavior +--------- -------------------------- +O_NONBLOCK Trylock operation + +You must provide exactly one of O_RDONLY or O_RDWR. + +If O_NONBLOCK is also provided and the trylock operation was valid but +could not lock the resource then open(2) will return ETXTBUSY. + +close(2) drops the lock associated with your fd. + +Modes passed to mkdir(2) or open(2) are adhered to locally. Chown is +supported locally as well. This means you can use them to restrict +access to the resources via dlmfs on your local node only. + +The resource LVB may be read from the fd in either Shared Read or +Exclusive modes via the read(2) system call. It can be written via +write(2) only when open in Exclusive mode. + +Once written, an LVB will be visible to other nodes who obtain Read +Only or higher level locks on the resource. + +See Also +======== +http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf + +For more information on the VMS distributed locking API. diff --git a/Documentation/filesystems/ocfs2.txt b/Documentation/filesystems/ocfs2.txt new file mode 100644 index 0000000..f2595ca --- /dev/null +++ b/Documentation/filesystems/ocfs2.txt @@ -0,0 +1,55 @@ +OCFS2 filesystem +================== +OCFS2 is a general purpose extent based shared disk cluster file +system with many similarities to ext3. It supports 64 bit inode +numbers, and has automatically extending metadata groups which may +also make it attractive for non-clustered use. + +You'll want to install the ocfs2-tools package in order to at least +get "mount.ocfs2" and "ocfs2_hb_ctl". + +Project web page: http://oss.oracle.com/projects/ocfs2 +Tools web page: http://oss.oracle.com/projects/ocfs2-tools +OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/ + +All code copyright 2005 Oracle except when otherwise noted. + +CREDITS: +Lots of code taken from ext3 and other projects. + +Authors in alphabetical order: +Joel Becker <joel.becker@oracle.com> +Zach Brown <zach.brown@oracle.com> +Mark Fasheh <mark.fasheh@oracle.com> +Kurt Hackel <kurt.hackel@oracle.com> +Sunil Mushran <sunil.mushran@oracle.com> +Manish Singh <manish.singh@oracle.com> + +Caveats +======= +Features which OCFS2 does not support yet: + - sparse files + - extended attributes + - shared writeable mmap + - loopback is supported, but data written will not + be cluster coherent. + - quotas + - cluster aware flock + - Directory change notification (F_NOTIFY) + - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease) + - POSIX ACLs + - readpages / writepages (not user visible) + +Mount options +============= + +OCFS2 supports the following mount options: +(*) == default + +barrier=1 This enables/disables barriers. barrier=0 disables it, + barrier=1 enables it. +errors=remount-ro(*) Remount the filesystem read-only on an error. +errors=panic Panic and halt the machine if an error occurs. +intr (*) Allow signals to interrupt cluster operations. +nointr Do not allow signals to interrupt cluster + operations. diff --git a/MAINTAINERS b/MAINTAINERS index 5daae53..e9db0d6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -554,6 +554,11 @@ W: http://us1.samba.org/samba/Linux_CIFS_client.html T: git kernel.org:/pub/scm/linux/kernel/git/sfrench/cifs-2.6.git S: Supported +CONFIGFS +P: Joel Becker +M: Joel Becker <joel.becker@oracle.com> +S: Supported + CIRRUS LOGIC GENERIC FBDEV DRIVER P: Jeff Garzik M: jgarzik@pobox.com @@ -1898,6 +1903,15 @@ M: ajoshi@shell.unixbox.com L: linux-nvidia@lists.surfsouth.com S: Maintained +ORACLE CLUSTER FILESYSTEM 2 (OCFS2) +P: Mark Fasheh +M: mark.fasheh@oracle.com +P: Kurt Hackel +M: kurt.hackel@oracle.com +L: ocfs2-devel@oss.oracle.com +W: http://oss.oracle.com/projects/ocfs2/ +S: Supported + OLYMPIC NETWORK DRIVER P: Peter De Shrijver M: p2@ace.ulyssis.student.kuleuven.ac.be diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 96c664a..a452b13 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -213,7 +213,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec, struct address_space_operations *aops = mapping->a_ops; pgoff_t index; unsigned offset, bv_offs; - int len, ret = 0; + int len, ret; down(&mapping->host->i_sem); index = pos >> PAGE_CACHE_SHIFT; @@ -232,9 +232,15 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec, page = grab_cache_page(mapping, index); if (unlikely(!page)) goto fail; - if (unlikely(aops->prepare_write(file, page, offset, - offset + size))) + ret = aops->prepare_write(file, page, offset, + offset + size); + if (unlikely(ret)) { + if (ret == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + continue; + } goto unlock; + } transfer_result = lo_do_transfer(lo, WRITE, page, offset, bvec->bv_page, bv_offs, size, IV); if (unlikely(transfer_result)) { @@ -251,9 +257,15 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec, kunmap_atomic(kaddr, KM_USER0); } flush_dcache_page(page); - if (unlikely(aops->commit_write(file, page, offset, - offset + size))) + ret = aops->commit_write(file, page, offset, + offset + size); + if (unlikely(ret)) { + if (ret == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + continue; + } goto unlock; + } if (unlikely(transfer_result)) goto unlock; bv_offs += size; @@ -264,6 +276,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec, unlock_page(page); page_cache_release(page); } + ret = 0; out: up(&mapping->host->i_sem); return ret; diff --git a/drivers/block/rd.c b/drivers/block/rd.c index 68c60a5..ffd6abd 100644 --- a/drivers/block/rd.c +++ b/drivers/block/rd.c @@ -154,7 +154,7 @@ static int ramdisk_commit_write(struct file *file, struct page *page, /* * ->writepage to the the blockdev's mapping has to redirty the page so that the - * VM doesn't go and steal it. We return WRITEPAGE_ACTIVATE so that the VM + * VM doesn't go and steal it. We return AOP_WRITEPAGE_ACTIVATE so that the VM * won't try to (pointlessly) write the page again for a while. * * Really, these pages should not be on the LRU at all. @@ -165,7 +165,7 @@ static int ramdisk_writepage(struct page *page, struct writeback_control *wbc) make_page_uptodate(page); SetPageDirty(page); if (wbc->for_reclaim) - return WRITEPAGE_ACTIVATE; + return AOP_WRITEPAGE_ACTIVATE; unlock_page(page); return 0; } @@ -70,6 +70,7 @@ config FS_XIP config EXT3_FS tristate "Ext3 journalling file system support" + select JBD help This is the journaling version of the Second extended file system (often called ext3), the de facto standard Linux file system @@ -138,23 +139,20 @@ config EXT3_FS_SECURITY extended attributes for file security labels, say N. config JBD -# CONFIG_JBD could be its own option (even modular), but until there are -# other users than ext3, we will simply make it be the same as CONFIG_EXT3_FS -# dep_tristate ' Journal Block Device support (JBD for ext3)' CONFIG_JBD $CONFIG_EXT3_FS tristate - default EXT3_FS help This is a generic journaling layer for block devices. It is - currently used by the ext3 file system, but it could also be used to - add journal support to other file systems or block devices such as - RAID or LVM. + currently used by the ext3 and OCFS2 file systems, but it could + also be used to add journal support to other file systems or block + devices such as RAID or LVM. - If you are using the ext3 file system, you need to say Y here. If - you are not using ext3 then you will probably want to say N. + If you are using the ext3 or OCFS2 file systems, you need to + say Y here. If you are not using ext3 OCFS2 then you will probably + want to say N. To compile this device as a module, choose M here: the module will be - called jbd. If you are compiling ext3 into the kernel, you cannot - compile this code as a module. + called jbd. If you are compiling ext3 or OCFS2 into the kernel, + you cannot compile this code as a module. config JBD_DEBUG bool "JBD (ext3) debugging support" @@ -326,6 +324,38 @@ config FS_POSIX_ACL source "fs/xfs/Kconfig" +config OCFS2_FS + tristate "OCFS2 file system support (EXPERIMENTAL)" + depends on NET && EXPERIMENTAL + select CONFIGFS_FS + select JBD + select CRC32 + select INET + help + OCFS2 is a general purpose extent based shared disk cluster file + system with many similarities to ext3. It supports 64 bit inode + numbers, and has automatically extending metadata groups which may + also make it attractive for non-clustered use. + + You'll want to install the ocfs2-tools package in order to at least + get "mount.ocfs2". + + Project web page: http://oss.oracle.com/projects/ocfs2 + Tools web page: http://oss.oracle.com/projects/ocfs2-tools + OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/ + + Note: Features which OCFS2 does not support yet: + - extended attributes + - shared writeable mmap + - loopback is supported, but data written will not + be cluster coherent. + - quotas + - cluster aware flock + - Directory change notification (F_NOTIFY) + - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease) + - POSIX ACLs + - readpages / writepages (not user visible) + config MINIX_FS tristate "Minix fs support" help @@ -841,6 +871,20 @@ config RELAYFS_FS If unsure, say N. +config CONFIGFS_FS + tristate "Userspace-driven configuration filesystem (EXPERIMENTAL)" + depends on EXPERIMENTAL + help + configfs is a ram-based filesystem that provides the converse + of sysfs's functionality. Where sysfs is a filesystem-based + view of kernel objects, configfs is a filesystem-based manager + of kernel objects, or config_items. + + Both sysfs and configfs can and should exist together on the + same system. One is not a replacement for the other. + + If unsure, say N. + endmenu menu "Miscellaneous filesystems" diff --git a/fs/Makefile b/fs/Makefile index 4c26557..7367611 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -101,3 +101,5 @@ obj-$(CONFIG_BEFS_FS) += befs/ obj-$(CONFIG_HOSTFS) += hostfs/ obj-$(CONFIG_HPPFS) += hppfs/ obj-$(CONFIG_DEBUG_FS) += debugfs/ +obj-$(CONFIG_CONFIGFS_FS) += configfs/ +obj-$(CONFIG_OCFS2_FS) += ocfs2/ diff --git a/fs/configfs/Makefile b/fs/configfs/Makefile new file mode 100644 index 0000000..00ffb27 --- /dev/null +++ b/fs/configfs/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the configfs virtual filesystem +# + +obj-$(CONFIG_CONFIGFS_FS) += configfs.o + +configfs-objs := inode.o file.o dir.o symlink.o mount.o item.o diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h new file mode 100644 index 0000000..8899d9c --- /dev/null +++ b/fs/configfs/configfs_internal.h @@ -0,0 +1,142 @@ +/* -*- mode: c; c-basic-offset:8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * configfs_internal.h - Internal stuff for configfs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#include <linux/slab.h> +#include <linux/list.h> + +struct configfs_dirent { + atomic_t s_count; + struct list_head s_sibling; + struct list_head s_children; + struct list_head s_links; + void * s_element; + int s_type; + umode_t s_mode; + struct dentry * s_dentry; +}; + +#define CONFIGFS_ROOT 0x0001 +#define CONFIGFS_DIR 0x0002 +#define CONFIGFS_ITEM_ATTR 0x0004 +#define CONFIGFS_ITEM_LINK 0x0020 +#define CONFIGFS_USET_DIR 0x0040 +#define CONFIGFS_USET_DEFAULT 0x0080 +#define CONFIGFS_USET_DROPPING 0x0100 +#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR) + +extern struct vfsmount * configfs_mount; + +extern int configfs_is_root(struct config_item *item); + +extern struct inode * configfs_new_inode(mode_t mode); +extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *)); + +extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); +extern int configfs_make_dirent(struct configfs_dirent *, + struct dentry *, void *, umode_t, int); + +extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int); +extern void configfs_hash_and_remove(struct dentry * dir, const char * name); + +extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); +extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); + +extern int configfs_pin_fs(void); +extern void configfs_release_fs(void); + +extern struct rw_semaphore configfs_rename_sem; +extern struct super_block * configfs_sb; +extern struct file_operations configfs_dir_operations; +extern struct file_operations configfs_file_operations; +extern struct file_operations bin_fops; +extern struct inode_operations configfs_dir_inode_operations; +extern struct inode_operations configfs_symlink_inode_operations; + +extern int configfs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname); +extern int configfs_unlink(struct inode *dir, struct dentry *dentry); + +struct configfs_symlink { + struct list_head sl_list; + struct config_item *sl_target; +}; + +extern int configfs_create_link(struct configfs_symlink *sl, + struct dentry *parent, + struct dentry *dentry); + +static inline struct config_item * to_item(struct dentry * dentry) +{ + struct configfs_dirent * sd = dentry->d_fsdata; + return ((struct config_item *) sd->s_element); +} + +static inline struct configfs_attribute * to_attr(struct dentry * dentry) +{ + struct configfs_dirent * sd = dentry->d_fsdata; + return ((struct configfs_attribute *) sd->s_element); +} + +static inline struct config_item *configfs_get_config_item(struct dentry *dentry) +{ + struct config_item * item = NULL; + + spin_lock(&dcache_lock); + if (!d_unhashed(dentry)) { + struct configfs_dirent * sd = dentry->d_fsdata; + if (sd->s_type & CONFIGFS_ITEM_LINK) { + struct configfs_symlink * sl = sd->s_element; + item = config_item_get(sl->sl_target); + } else + item = config_item_get(sd->s_element); + } + spin_unlock(&dcache_lock); + + return item; +} + +static inline void release_configfs_dirent(struct configfs_dirent * sd) +{ + if (!(sd->s_type & CONFIGFS_ROOT)) + kfree(sd); +} + +static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) +{ + if (sd) { + WARN_ON(!atomic_read(&sd->s_count)); + atomic_inc(&sd->s_count); + } + return sd; +} + +static inline void configfs_put(struct configfs_dirent * sd) +{ + WARN_ON(!atomic_read(&sd->s_count)); + if (atomic_dec_and_test(&sd->s_count)) + release_configfs_dirent(sd); +} + diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c new file mode 100644 index 0000000..e48b539 --- /dev/null +++ b/fs/configfs/dir.c @@ -0,0 +1,1102 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dir.c - Operations for configfs directories. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#undef DEBUG + +#include <linux/fs.h> +#include <linux/mount.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <linux/configfs.h> +#include "configfs_internal.h" + +DECLARE_RWSEM(configfs_rename_sem); + +static void configfs_d_iput(struct dentry * dentry, + struct inode * inode) +{ + struct configfs_dirent * sd = dentry->d_fsdata; + + if (sd) { + BUG_ON(sd->s_dentry != dentry); + sd->s_dentry = NULL; + configfs_put(sd); + } + iput(inode); +} + +/* + * We _must_ delete our dentries on last dput, as the chain-to-parent + * behavior is required to clear the parents of default_groups. + */ +static int configfs_d_delete(struct dentry *dentry) +{ + return 1; +} + +static struct dentry_operations configfs_dentry_ops = { + .d_iput = configfs_d_iput, + /* simple_delete_dentry() isn't exported */ + .d_delete = configfs_d_delete, +}; + +/* + * Allocates a new configfs_dirent and links it to the parent configfs_dirent + */ +static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent * parent_sd, + void * element) +{ + struct configfs_dirent * sd; + + sd = kmalloc(sizeof(*sd), GFP_KERNEL); + if (!sd) + return NULL; + + memset(sd, 0, sizeof(*sd)); + atomic_set(&sd->s_count, 1); + INIT_LIST_HEAD(&sd->s_links); + INIT_LIST_HEAD(&sd->s_children); + list_add(&sd->s_sibling, &parent_sd->s_children); + sd->s_element = element; + + return sd; +} + +int configfs_make_dirent(struct configfs_dirent * parent_sd, + struct dentry * dentry, void * element, + umode_t mode, int type) +{ + struct configfs_dirent * sd; + + sd = configfs_new_dirent(parent_sd, element); + if (!sd) + return -ENOMEM; + + sd->s_mode = mode; + sd->s_type = type; + sd->s_dentry = dentry; + if (dentry) { + dentry->d_fsdata = configfs_get(sd); + dentry->d_op = &configfs_dentry_ops; + } + + return 0; +} + +static int init_dir(struct inode * inode) +{ + inode->i_op = &configfs_dir_inode_operations; + inode->i_fop = &configfs_dir_operations; + + /* directory inodes start off with i_nlink == 2 (for "." entry) */ + inode->i_nlink++; + return 0; +} + +static int init_file(struct inode * inode) +{ + inode->i_size = PAGE_SIZE; + inode->i_fop = &configfs_file_operations; + return 0; +} + +static int init_symlink(struct inode * inode) +{ + inode->i_op = &configfs_symlink_inode_operations; + return 0; +} + +static int create_dir(struct config_item * k, struct dentry * p, + struct dentry * d) +{ + int error; + umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; + + error = configfs_create(d, mode, init_dir); + if (!error) { + error = configfs_make_dirent(p->d_fsdata, d, k, mode, + CONFIGFS_DIR); + if (!error) { + p->d_inode->i_nlink++; + (d)->d_op = &configfs_dentry_ops; + } + } + return error; +} + + +/** + * configfs_create_dir - create a directory for an config_item. + * @item: config_itemwe're creating directory for. + * @dentry: config_item's dentry. + */ + +static int configfs_create_dir(struct config_item * item, struct dentry *dentry) +{ + struct dentry * parent; + int error = 0; + + BUG_ON(!item); + + if (item->ci_parent) + parent = item->ci_parent->ci_dentry; + else if (configfs_mount && configfs_mount->mnt_sb) + parent = configfs_mount->mnt_sb->s_root; + else + return -EFAULT; + + error = create_dir(item,parent,dentry); + if (!error) + item->ci_dentry = dentry; + return error; +} + +int configfs_create_link(struct configfs_symlink *sl, + struct dentry *parent, + struct dentry *dentry) +{ + int err = 0; + umode_t mode = S_IFLNK | S_IRWXUGO; + + err = configfs_create(dentry, mode, init_symlink); + if (!err) { + err = configfs_make_dirent(parent->d_fsdata, dentry, sl, + mode, CONFIGFS_ITEM_LINK); + if (!err) + dentry->d_op = &configfs_dentry_ops; + } + return err; +} + +static void remove_dir(struct dentry * d) +{ + struct dentry * parent = dget(d->d_parent); + struct configfs_dirent * sd; + + sd = d->d_fsdata; + list_del_init(&sd->s_sibling); + configfs_put(sd); + if (d->d_inode) + simple_rmdir(parent->d_inode,d); + + pr_debug(" o %s removing done (%d)\n",d->d_name.name, + atomic_read(&d->d_count)); + + dput(parent); +} + +/** + * configfs_remove_dir - remove an config_item's directory. + * @item: config_item we're removing. + * + * The only thing special about this is that we remove any files in + * the directory before we remove the directory, and we've inlined + * what used to be configfs_rmdir() below, instead of calling separately. + */ + +static void configfs_remove_dir(struct config_item * item) +{ + struct dentry * dentry = dget(item->ci_dentry); + + if (!dentry) + return; + + remove_dir(dentry); + /** + * Drop reference from dget() on entrance. + */ + dput(dentry); +} + + +/* attaches attribute's configfs_dirent to the dentry corresponding to the + * attribute file + */ +static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry) +{ + struct configfs_attribute * attr = sd->s_element; + int error; + + error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG, init_file); + if (error) + return error; + + dentry->d_op = &configfs_dentry_ops; + dentry->d_fsdata = configfs_get(sd); + sd->s_dentry = dentry; + d_rehash(dentry); + + return 0; +} + +static struct dentry * configfs_lookup(struct inode *dir, + struct dentry *dentry, + struct nameidata *nd) +{ + struct configfs_dirent * parent_sd = dentry->d_parent->d_fsdata; + struct configfs_dirent * sd; + int found = 0; + int err = 0; + + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (sd->s_type & CONFIGFS_NOT_PINNED) { + const unsigned char * name = configfs_get_name(sd); + + if (strcmp(name, dentry->d_name.name)) + continue; + + found = 1; + err = configfs_attach_attr(sd, dentry); + break; + } + } + + if (!found) { + /* + * If it doesn't exist and it isn't a NOT_PINNED item, + * it must be negative. + */ + return simple_lookup(dir, dentry, nd); + } + + return ERR_PTR(err); +} + +/* + * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are + * attributes and are removed by rmdir(). We recurse, taking i_sem + * on all children that are candidates for default detach. If the + * result is clean, then configfs_detach_group() will handle dropping + * i_sem. If there is an error, the caller will clean up the i_sem + * holders via configfs_detach_rollback(). + */ +static int configfs_detach_prep(struct dentry *dentry) +{ + struct configfs_dirent *parent_sd = dentry->d_fsdata; + struct configfs_dirent *sd; + int ret; + + ret = -EBUSY; + if (!list_empty(&parent_sd->s_links)) + goto out; + + ret = 0; + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (sd->s_type & CONFIGFS_NOT_PINNED) + continue; + if (sd->s_type & CONFIGFS_USET_DEFAULT) { + down(&sd->s_dentry->d_inode->i_sem); + /* Mark that we've taken i_sem */ + sd->s_type |= CONFIGFS_USET_DROPPING; + + ret = configfs_detach_prep(sd->s_dentry); + if (!ret) + continue; + } else + ret = -ENOTEMPTY; + + break; + } + +out: + return ret; +} + +/* + * Walk the tree, dropping i_sem wherever CONFIGFS_USET_DROPPING is + * set. + */ +static void configfs_detach_rollback(struct dentry *dentry) +{ + struct configfs_dirent *parent_sd = dentry->d_fsdata; + struct configfs_dirent *sd; + + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (sd->s_type & CONFIGFS_USET_DEFAULT) { + configfs_detach_rollback(sd->s_dentry); + + if (sd->s_type & CONFIGFS_USET_DROPPING) { + sd->s_type &= ~CONFIGFS_USET_DROPPING; + up(&sd->s_dentry->d_inode->i_sem); + } + } + } +} + +static void detach_attrs(struct config_item * item) +{ + struct dentry * dentry = dget(item->ci_dentry); + struct configfs_dirent * parent_sd; + struct configfs_dirent * sd, * tmp; + + if (!dentry) + return; + + pr_debug("configfs %s: dropping attrs for dir\n", + dentry->d_name.name); + + parent_sd = dentry->d_fsdata; + list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { + if (!sd->s_element || !(sd->s_type & CONFIGFS_NOT_PINNED)) + continue; + list_del_init(&sd->s_sibling); + configfs_drop_dentry(sd, dentry); + configfs_put(sd); + } + + /** + * Drop reference from dget() on entrance. + */ + dput(dentry); +} + +static int populate_attrs(struct config_item *item) +{ + struct config_item_type *t = item->ci_type; + struct configfs_attribute *attr; + int error = 0; + int i; + + if (!t) + return -EINVAL; + if (t->ct_attrs) { + for (i = 0; (attr = t->ct_attrs[i]) != NULL; i++) { + if ((error = configfs_create_file(item, attr))) + break; + } + } + + if (error) + detach_attrs(item); + + return error; +} + +static int configfs_attach_group(struct config_item *parent_item, + struct config_item *item, + struct dentry *dentry); +static void configfs_detach_group(struct config_item *item); + +static void detach_groups(struct config_group *group) +{ + struct dentry * dentry = dget(group->cg_item.ci_dentry); + struct dentry *child; + struct configfs_dirent *parent_sd; + struct configfs_dirent *sd, *tmp; + + if (!dentry) + return; + + parent_sd = dentry->d_fsdata; + list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { + if (!sd->s_element || + !(sd->s_type & CONFIGFS_USET_DEFAULT)) + continue; + + child = sd->s_dentry; + + configfs_detach_group(sd->s_element); + child->d_inode->i_flags |= S_DEAD; + + /* + * From rmdir/unregister, a configfs_detach_prep() pass + * has taken our i_sem for us. Drop it. + * From mkdir/register cleanup, there is no sem held. + */ + if (sd->s_type & CONFIGFS_USET_DROPPING) + up(&child->d_inode->i_sem); + + d_delete(child); + dput(child); + } + + /** + * Drop reference from dget() on entrance. + */ + dput(dentry); +} + +/* + * This fakes mkdir(2) on a default_groups[] entry. It + * creates a dentry, attachs it, and then does fixup + * on the sd->s_type. + * + * We could, perhaps, tweak our parent's ->mkdir for a minute and + * try using vfs_mkdir. Just a thought. + */ +static int create_default_group(struct config_group *parent_group, + struct config_group *group) +{ + int ret; + struct qstr name; + struct configfs_dirent *sd; + /* We trust the caller holds a reference to parent */ + struct dentry *child, *parent = parent_group->cg_item.ci_dentry; + + if (!group->cg_item.ci_name) + group->cg_item.ci_name = group->cg_item.ci_namebuf; + name.name = group->cg_item.ci_name; + name.len = strlen(name.name); + name.hash = full_name_hash(name.name, name.len); + + ret = -ENOMEM; + child = d_alloc(parent, &name); + if (child) { + d_add(child, NULL); + + ret = configfs_attach_group(&parent_group->cg_item, + &group->cg_item, child); + if (!ret) { + sd = child->d_fsdata; + sd->s_type |= CONFIGFS_USET_DEFAULT; + } else { + d_delete(child); + dput(child); + } + } + + return ret; +} + +static int populate_groups(struct config_group *group) +{ + struct config_group *new_group; + struct dentry *dentry = group->cg_item.ci_dentry; + int ret = 0; + int i; + + if (group && group->default_groups) { + /* FYI, we're faking mkdir here + * I'm not sure we need this semaphore, as we're called + * from our parent's mkdir. That holds our parent's + * i_sem, so afaik lookup cannot continue through our + * parent to find us, let alone mess with our tree. + * That said, taking our i_sem is closer to mkdir + * emulation, and shouldn't hurt. */ + down(&dentry->d_inode->i_sem); + + for (i = 0; group->default_groups[i]; i++) { + new_group = group->default_groups[i]; + + ret = create_default_group(group, new_group); + if (ret) + break; + } + + up(&dentry->d_inode->i_sem); + } + + if (ret) + detach_groups(group); + + return ret; +} + +/* + * All of link_obj/unlink_obj/link_group/unlink_group require that + * subsys->su_sem is held. + */ + +static void unlink_obj(struct config_item *item) +{ + struct config_group *group; + + group = item->ci_group; + if (group) { + list_del_init(&item->ci_entry); + + item->ci_group = NULL; + item->ci_parent = NULL; + config_item_put(item); + + config_group_put(group); + } +} + +static void link_obj(struct config_item *parent_item, struct config_item *item) +{ + /* Parent seems redundant with group, but it makes certain + * traversals much nicer. */ + item->ci_parent = parent_item; + item->ci_group = config_group_get(to_config_group(parent_item)); + list_add_tail(&item->ci_entry, &item->ci_group->cg_children); + + config_item_get(item); +} + +static void unlink_group(struct config_group *group) +{ + int i; + struct config_group *new_group; + + if (group->default_groups) { + for (i = 0; group->default_groups[i]; i++) { + new_group = group->default_groups[i]; + unlink_group(new_group); + } + } + + group->cg_subsys = NULL; + unlink_obj(&group->cg_item); +} + +static void link_group(struct config_group *parent_group, struct config_group *group) +{ + int i; + struct config_group *new_group; + struct configfs_subsystem *subsys = NULL; /* gcc is a turd */ + + link_obj(&parent_group->cg_item, &group->cg_item); + + if (parent_group->cg_subsys) + subsys = parent_group->cg_subsys; + else if (configfs_is_root(&parent_group->cg_item)) + subsys = to_configfs_subsystem(group); + else + BUG(); + group->cg_subsys = subsys; + + if (group->default_groups) { + for (i = 0; group->default_groups[i]; i++) { + new_group = group->default_groups[i]; + link_group(group, new_group); + } + } +} + +/* + * The goal is that configfs_attach_item() (and + * configfs_attach_group()) can be called from either the VFS or this + * module. That is, they assume that the items have been created, + * the dentry allocated, and the dcache is all ready to go. + * + * If they fail, they must clean up after themselves as if they + * had never been called. The caller (VFS or local function) will + * handle cleaning up the dcache bits. + * + * configfs_detach_group() and configfs_detach_item() behave similarly on + * the way out. They assume that the proper semaphores are held, they + * clean up the configfs items, and they expect their callers will + * handle the dcache bits. + */ +static int configfs_attach_item(struct config_item *parent_item, + struct config_item *item, + struct dentry *dentry) +{ + int ret; + + ret = configfs_create_dir(item, dentry); + if (!ret) { + ret = populate_attrs(item); + if (ret) { + configfs_remove_dir(item); + d_delete(dentry); + } + } + + return ret; +} + +static void configfs_detach_item(struct config_item *item) +{ + detach_attrs(item); + configfs_remove_dir(item); +} + +static int configfs_attach_group(struct config_item *parent_item, + struct config_item *item, + struct dentry *dentry) +{ + int ret; + struct configfs_dirent *sd; + + ret = configfs_attach_item(parent_item, item, dentry); + if (!ret) { + sd = dentry->d_fsdata; + sd->s_type |= CONFIGFS_USET_DIR; + + ret = populate_groups(to_config_group(item)); + if (ret) { + configfs_detach_item(item); + d_delete(dentry); + } + } + + return ret; +} + +static void configfs_detach_group(struct config_item *item) +{ + detach_groups(to_config_group(item)); + configfs_detach_item(item); +} + +/* + * Drop the initial reference from make_item()/make_group() + * This function assumes that reference is held on item + * and that item holds a valid reference to the parent. Also, it + * assumes the caller has validated ci_type. + */ +static void client_drop_item(struct config_item *parent_item, + struct config_item *item) +{ + struct config_item_type *type; + + type = parent_item->ci_type; + BUG_ON(!type); + + if (type->ct_group_ops && type->ct_group_ops->drop_item) + type->ct_group_ops->drop_item(to_config_group(parent_item), + item); + else + config_item_put(item); +} + + +static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) +{ + int ret; + struct config_group *group; + struct config_item *item; + struct config_item *parent_item; + struct configfs_subsystem *subsys; + struct configfs_dirent *sd; + struct config_item_type *type; + struct module *owner; + char *name; + + if (dentry->d_parent == configfs_sb->s_root) + return -EPERM; + + sd = dentry->d_parent->d_fsdata; + if (!(sd->s_type & CONFIGFS_USET_DIR)) + return -EPERM; + + parent_item = configfs_get_config_item(dentry->d_parent); + type = parent_item->ci_type; + subsys = to_config_group(parent_item)->cg_subsys; + BUG_ON(!subsys); + + if (!type || !type->ct_group_ops || + (!type->ct_group_ops->make_group && + !type->ct_group_ops->make_item)) { + config_item_put(parent_item); + return -EPERM; /* What lack-of-mkdir returns */ + } + + name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); + if (!name) { + config_item_put(parent_item); + return -ENOMEM; + } + snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); + + down(&subsys->su_sem); + group = NULL; + item = NULL; + if (type->ct_group_ops->make_group) { + group = type->ct_group_ops->make_group(to_config_group(parent_item), name); + if (group) { + link_group(to_config_group(parent_item), group); + item = &group->cg_item; + } + } else { + item = type->ct_group_ops->make_item(to_config_group(parent_item), name); + if (item) + link_obj(parent_item, item); + } + up(&subsys->su_sem); + + kfree(name); + if (!item) { + config_item_put(parent_item); + return -ENOMEM; + } + + ret = -EINVAL; + type = item->ci_type; + if (type) { + owner = type->ct_owner; + if (try_module_get(owner)) { + if (group) { + ret = configfs_attach_group(parent_item, + item, + dentry); + } else { + ret = configfs_attach_item(parent_item, + item, + dentry); + } + + if (ret) { + down(&subsys->su_sem); + if (group) + unlink_group(group); + else + unlink_obj(item); + client_drop_item(parent_item, item); + up(&subsys->su_sem); + + config_item_put(parent_item); + module_put(owner); + } + } + } + + return ret; +} + +static int configfs_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct config_item *parent_item; + struct config_item *item; + struct configfs_subsystem *subsys; + struct configfs_dirent *sd; + struct module *owner = NULL; + int ret; + + if (dentry->d_parent == configfs_sb->s_root) + return -EPERM; + + sd = dentry->d_fsdata; + if (sd->s_type & CONFIGFS_USET_DEFAULT) + return -EPERM; + + parent_item = configfs_get_config_item(dentry->d_parent); + subsys = to_config_group(parent_item)->cg_subsys; + BUG_ON(!subsys); + + if (!parent_item->ci_type) { + config_item_put(parent_item); + return -EINVAL; + } + + ret = configfs_detach_prep(dentry); + if (ret) { + configfs_detach_rollback(dentry); + config_item_put(parent_item); + return ret; + } + + item = configfs_get_config_item(dentry); + + /* Drop reference from above, item already holds one. */ + config_item_put(parent_item); + + if (item->ci_type) + owner = item->ci_type->ct_owner; + + if (sd->s_type & CONFIGFS_USET_DIR) { + configfs_detach_group(item); + + down(&subsys->su_sem); + unlink_group(to_config_group(item)); + } else { + configfs_detach_item(item); + + down(&subsys->su_sem); + unlink_obj(item); + } + + client_drop_item(parent_item, item); + up(&subsys->su_sem); + + /* Drop our reference from above */ + config_item_put(item); + + module_put(owner); + + return 0; +} + +struct inode_operations configfs_dir_inode_operations = { + .mkdir = configfs_mkdir, + .rmdir = configfs_rmdir, + .symlink = configfs_symlink, + .unlink = configfs_unlink, + .lookup = configfs_lookup, +}; + +#if 0 +int configfs_rename_dir(struct config_item * item, const char *new_name) +{ + int error = 0; + struct dentry * new_dentry, * parent; + + if (!strcmp(config_item_name(item), new_name)) + return -EINVAL; + + if (!item->parent) + return -EINVAL; + + down_write(&configfs_rename_sem); + parent = item->parent->dentry; + + down(&parent->d_inode->i_sem); + + new_dentry = lookup_one_len(new_name, parent, strlen(new_name)); + if (!IS_ERR(new_dentry)) { + if (!new_dentry->d_inode) { + error = config_item_set_name(item, "%s", new_name); + if (!error) { + d_add(new_dentry, NULL); + d_move(item->dentry, new_dentry); + } + else + d_delete(new_dentry); + } else + error = -EEXIST; + dput(new_dentry); + } + up(&parent->d_inode->i_sem); + up_write(&configfs_rename_sem); + + return error; +} +#endif + +static int configfs_dir_open(struct inode *inode, struct file *file) +{ + struct dentry * dentry = file->f_dentry; + struct configfs_dirent * parent_sd = dentry->d_fsdata; + + down(&dentry->d_inode->i_sem); + file->private_data = configfs_new_dirent(parent_sd, NULL); + up(&dentry->d_inode->i_sem); + + return file->private_data ? 0 : -ENOMEM; + +} + +static int configfs_dir_close(struct inode *inode, struct file *file) +{ + struct dentry * dentry = file->f_dentry; + struct configfs_dirent * cursor = file->private_data; + + down(&dentry->d_inode->i_sem); + list_del_init(&cursor->s_sibling); + up(&dentry->d_inode->i_sem); + + release_configfs_dirent(cursor); + + return 0; +} + +/* Relationship between s_mode and the DT_xxx types */ +static inline unsigned char dt_type(struct configfs_dirent *sd) +{ + return (sd->s_mode >> 12) & 15; +} + +static int configfs_readdir(struct file * filp, void * dirent, filldir_t filldir) +{ + struct dentry *dentry = filp->f_dentry; + struct configfs_dirent * parent_sd = dentry->d_fsdata; + struct configfs_dirent *cursor = filp->private_data; + struct list_head *p, *q = &cursor->s_sibling; + ino_t ino; + int i = filp->f_pos; + + switch (i) { + case 0: + ino = dentry->d_inode->i_ino; + if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) + break; + filp->f_pos++; + i++; + /* fallthrough */ + case 1: + ino = parent_ino(dentry); + if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) + break; + filp->f_pos++; + i++; + /* fallthrough */ + default: + if (filp->f_pos == 2) { + list_del(q); + list_add(q, &parent_sd->s_children); + } + for (p=q->next; p!= &parent_sd->s_children; p=p->next) { + struct configfs_dirent *next; + const char * name; + int len; + + next = list_entry(p, struct configfs_dirent, + s_sibling); + if (!next->s_element) + continue; + + name = configfs_get_name(next); + len = strlen(name); + if (next->s_dentry) + ino = next->s_dentry->d_inode->i_ino; + else + ino = iunique(configfs_sb, 2); + + if (filldir(dirent, name, len, filp->f_pos, ino, + dt_type(next)) < 0) + return 0; + + list_del(q); + list_add(q, p); + p = q; + filp->f_pos++; + } + } + return 0; +} + +static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin) +{ + struct dentry * dentry = file->f_dentry; + + down(&dentry->d_inode->i_sem); + switch (origin) { + case 1: + offset += file->f_pos; + case 0: + if (offset >= 0) + break; + default: + up(&file->f_dentry->d_inode->i_sem); + return -EINVAL; + } + if (offset != file->f_pos) { + file->f_pos = offset; + if (file->f_pos >= 2) { + struct configfs_dirent *sd = dentry->d_fsdata; + struct configfs_dirent *cursor = file->private_data; + struct list_head *p; + loff_t n = file->f_pos - 2; + + list_del(&cursor->s_sibling); + p = sd->s_children.next; + while (n && p != &sd->s_children) { + struct configfs_dirent *next; + next = list_entry(p, struct configfs_dirent, + s_sibling); + if (next->s_element) + n--; + p = p->next; + } + list_add_tail(&cursor->s_sibling, p); + } + } + up(&dentry->d_inode->i_sem); + return offset; +} + +struct file_operations configfs_dir_operations = { + .open = configfs_dir_open, + .release = configfs_dir_close, + .llseek = configfs_dir_lseek, + .read = generic_read_dir, + .readdir = configfs_readdir, +}; + +int configfs_register_subsystem(struct configfs_subsystem *subsys) +{ + int err; + struct config_group *group = &subsys->su_group; + struct qstr name; + struct dentry *dentry; + struct configfs_dirent *sd; + + err = configfs_pin_fs(); + if (err) + return err; + + if (!group->cg_item.ci_name) + group->cg_item.ci_name = group->cg_item.ci_namebuf; + + sd = configfs_sb->s_root->d_fsdata; + link_group(to_config_group(sd->s_element), group); + + down(&configfs_sb->s_root->d_inode->i_sem); + + name.name = group->cg_item.ci_name; + name.len = strlen(name.name); + name.hash = full_name_hash(name.name, name.len); + + err = -ENOMEM; + dentry = d_alloc(configfs_sb->s_root, &name); + if (!dentry) + goto out_release; + + d_add(dentry, NULL); + + err = configfs_attach_group(sd->s_element, &group->cg_item, + dentry); + if (!err) + dentry = NULL; + else + d_delete(dentry); + + up(&configfs_sb->s_root->d_inode->i_sem); + + if (dentry) { + dput(dentry); +out_release: + unlink_group(group); + configfs_release_fs(); + } + + return err; +} + +void configfs_unregister_subsystem(struct configfs_subsystem *subsys) +{ + struct config_group *group = &subsys->su_group; + struct dentry *dentry = group->cg_item.ci_dentry; + + if (dentry->d_parent != configfs_sb->s_root) { + printk(KERN_ERR "configfs: Tried to unregister non-subsystem!\n"); + return; + } + + down(&configfs_sb->s_root->d_inode->i_sem); + down(&dentry->d_inode->i_sem); + if (configfs_detach_prep(dentry)) { + printk(KERN_ERR "configfs: Tried to unregister non-empty subsystem!\n"); + } + configfs_detach_group(&group->cg_item); + dentry->d_inode->i_flags |= S_DEAD; + up(&dentry->d_inode->i_sem); + + d_delete(dentry); + + up(&configfs_sb->s_root->d_inode->i_sem); + + dput(dentry); + + unlink_group(group); + configfs_release_fs(); +} + +EXPORT_SYMBOL(configfs_register_subsystem); +EXPORT_SYMBOL(configfs_unregister_subsystem); diff --git a/fs/configfs/file.c b/fs/configfs/file.c new file mode 100644 index 0000000..af1ffc9 --- /dev/null +++ b/fs/configfs/file.c @@ -0,0 +1,360 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * file.c - operations for regular (text) files. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/dnotify.h> +#include <linux/slab.h> +#include <asm/uaccess.h> +#include <asm/semaphore.h> + +#include <linux/configfs.h> +#include "configfs_internal.h" + + +struct configfs_buffer { + size_t count; + loff_t pos; + char * page; + struct configfs_item_operations * ops; + struct semaphore sem; + int needs_read_fill; +}; + + +/** + * fill_read_buffer - allocate and fill buffer from item. + * @dentry: dentry pointer. + * @buffer: data buffer for file. + * + * Allocate @buffer->page, if it hasn't been already, then call the + * config_item's show() method to fill the buffer with this attribute's + * data. + * This is called only once, on the file's first read. + */ +static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buffer) +{ + struct configfs_attribute * attr = to_attr(dentry); + struct config_item * item = to_item(dentry->d_parent); + struct configfs_item_operations * ops = buffer->ops; + int ret = 0; + ssize_t count; + + if (!buffer->page) + buffer->page = (char *) get_zeroed_page(GFP_KERNEL); + if (!buffer->page) + return -ENOMEM; + + count = ops->show_attribute(item,attr,buffer->page); + buffer->needs_read_fill = 0; + BUG_ON(count > (ssize_t)PAGE_SIZE); + if (count >= 0) + buffer->count = count; + else + ret = count; + return ret; +} + + +/** + * flush_read_buffer - push buffer to userspace. + * @buffer: data buffer for file. + * @userbuf: user-passed buffer. + * @count: number of bytes requested. + * @ppos: file position. + * + * Copy the buffer we filled in fill_read_buffer() to userspace. + * This is done at the reader's leisure, copying and advancing + * the amount they specify each time. + * This may be called continuously until the buffer is empty. + */ +static int flush_read_buffer(struct configfs_buffer * buffer, char __user * buf, + size_t count, loff_t * ppos) +{ + int error; + + if (*ppos > buffer->count) + return 0; + + if (count > (buffer->count - *ppos)) + count = buffer->count - *ppos; + + error = copy_to_user(buf,buffer->page + *ppos,count); + if (!error) + *ppos += count; + return error ? -EFAULT : count; +} + +/** + * configfs_read_file - read an attribute. + * @file: file pointer. + * @buf: buffer to fill. + * @count: number of bytes to read. + * @ppos: starting offset in file. + * + * Userspace wants to read an attribute file. The attribute descriptor + * is in the file's ->d_fsdata. The target item is in the directory's + * ->d_fsdata. + * + * We call fill_read_buffer() to allocate and fill the buffer from the + * item's show() method exactly once (if the read is happening from + * the beginning of the file). That should fill the entire buffer with + * all the data the item has to offer for that attribute. + * We then call flush_read_buffer() to copy the buffer to userspace + * in the increments specified. + */ + +static ssize_t +configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos) +{ + struct configfs_buffer * buffer = file->private_data; + ssize_t retval = 0; + + down(&buffer->sem); + if (buffer->needs_read_fill) { + if ((retval = fill_read_buffer(file->f_dentry,buffer))) + goto out; + } + pr_debug("%s: count = %d, ppos = %lld, buf = %s\n", + __FUNCTION__,count,*ppos,buffer->page); + retval = flush_read_buffer(buffer,buf,count,ppos); +out: + up(&buffer->sem); + return retval; +} + + +/** + * fill_write_buffer - copy buffer from userspace. + * @buffer: data buffer for file. + * @userbuf: data from user. + * @count: number of bytes in @userbuf. + * + * Allocate @buffer->page if it hasn't been already, then + * copy the user-supplied buffer into it. + */ + +static int +fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count) +{ + int error; + + if (!buffer->page) + buffer->page = (char *)get_zeroed_page(GFP_KERNEL); + if (!buffer->page) + return -ENOMEM; + + if (count > PAGE_SIZE) + count = PAGE_SIZE; + error = copy_from_user(buffer->page,buf,count); + buffer->needs_read_fill = 1; + return error ? -EFAULT : count; +} + + +/** + * flush_write_buffer - push buffer to config_item. + * @file: file pointer. + * @buffer: data buffer for file. + * + * Get the correct pointers for the config_item and the attribute we're + * dealing with, then call the store() method for the attribute, + * passing the buffer that we acquired in fill_write_buffer(). + */ + +static int +flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size_t count) +{ + struct configfs_attribute * attr = to_attr(dentry); + struct config_item * item = to_item(dentry->d_parent); + struct configfs_item_operations * ops = buffer->ops; + + return ops->store_attribute(item,attr,buffer->page,count); +} + + +/** + * configfs_write_file - write an attribute. + * @file: file pointer + * @buf: data to write + * @count: number of bytes + * @ppos: starting offset + * + * Similar to configfs_read_file(), though working in the opposite direction. + * We allocate and fill the data from the user in fill_write_buffer(), + * then push it to the config_item in flush_write_buffer(). + * There is no easy way for us to know if userspace is only doing a partial + * write, so we don't support them. We expect the entire buffer to come + * on the first write. + * Hint: if you're writing a value, first read the file, modify only the + * the value you're changing, then write entire buffer back. + */ + +static ssize_t +configfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t *ppos) +{ + struct configfs_buffer * buffer = file->private_data; + + down(&buffer->sem); + count = fill_write_buffer(buffer,buf,count); + if (count > 0) + count = flush_write_buffer(file->f_dentry,buffer,count); + if (count > 0) + *ppos += count; + up(&buffer->sem); + return count; +} + +static int check_perm(struct inode * inode, struct file * file) +{ + struct config_item *item = configfs_get_config_item(file->f_dentry->d_parent); + struct configfs_attribute * attr = to_attr(file->f_dentry); + struct configfs_buffer * buffer; + struct configfs_item_operations * ops = NULL; + int error = 0; + + if (!item || !attr) + goto Einval; + + /* Grab the module reference for this attribute if we have one */ + if (!try_module_get(attr->ca_owner)) { + error = -ENODEV; + goto Done; + } + + if (item->ci_type) + ops = item->ci_type->ct_item_ops; + else + goto Eaccess; + + /* File needs write support. + * The inode's perms must say it's ok, + * and we must have a store method. + */ + if (file->f_mode & FMODE_WRITE) { + + if (!(inode->i_mode & S_IWUGO) || !ops->store_attribute) + goto Eaccess; + + } + + /* File needs read support. + * The inode's perms must say it's ok, and we there + * must be a show method for it. + */ + if (file->f_mode & FMODE_READ) { + if (!(inode->i_mode & S_IRUGO) || !ops->show_attribute) + goto Eaccess; + } + + /* No error? Great, allocate a buffer for the file, and store it + * it in file->private_data for easy access. + */ + buffer = kmalloc(sizeof(struct configfs_buffer),GFP_KERNEL); + if (buffer) { + memset(buffer,0,sizeof(struct configfs_buffer)); + init_MUTEX(&buffer->sem); + buffer->needs_read_fill = 1; + buffer->ops = ops; + file->private_data = buffer; + } else + error = -ENOMEM; + goto Done; + + Einval: + error = -EINVAL; + goto Done; + Eaccess: + error = -EACCES; + module_put(attr->ca_owner); + Done: + if (error && item) + config_item_put(item); + return error; +} + +static int configfs_open_file(struct inode * inode, struct file * filp) +{ + return check_perm(inode,filp); +} + +static int configfs_release(struct inode * inode, struct file * filp) +{ + struct config_item * item = to_item(filp->f_dentry->d_parent); + struct configfs_attribute * attr = to_attr(filp->f_dentry); + struct module * owner = attr->ca_owner; + struct configfs_buffer * buffer = filp->private_data; + + if (item) + config_item_put(item); + /* After this point, attr should not be accessed. */ + module_put(owner); + + if (buffer) { + if (buffer->page) + free_page((unsigned long)buffer->page); + kfree(buffer); + } + return 0; +} + +struct file_operations configfs_file_operations = { + .read = configfs_read_file, + .write = configfs_write_file, + .llseek = generic_file_llseek, + .open = configfs_open_file, + .release = configfs_release, +}; + + +int configfs_add_file(struct dentry * dir, const struct configfs_attribute * attr, int type) +{ + struct configfs_dirent * parent_sd = dir->d_fsdata; + umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG; + int error = 0; + + down(&dir->d_inode->i_sem); + error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type); + up(&dir->d_inode->i_sem); + + return error; +} + + +/** + * configfs_create_file - create an attribute file for an item. + * @item: item we're creating for. + * @attr: atrribute descriptor. + */ + +int configfs_create_file(struct config_item * item, const struct configfs_attribute * attr) +{ + BUG_ON(!item || !item->ci_dentry || !attr); + + return configfs_add_file(item->ci_dentry, attr, + CONFIGFS_ITEM_ATTR); +} + diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c new file mode 100644 index 0000000..6b274c6 --- /dev/null +++ b/fs/configfs/inode.c @@ -0,0 +1,162 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * inode.c - basic inode and dentry operations. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + * + * Please see Documentation/filesystems/configfs.txt for more information. + */ + +#undef DEBUG + +#include <linux/pagemap.h> +#include <linux/namei.h> +#include <linux/backing-dev.h> + +#include <linux/configfs.h> +#include "configfs_internal.h" + +extern struct super_block * configfs_sb; + +static struct address_space_operations configfs_aops = { + .readpage = simple_readpage, + .prepare_write = simple_prepare_write, + .commit_write = simple_commit_write +}; + +static struct backing_dev_info configfs_backing_dev_info = { + .ra_pages = 0, /* No readahead */ + .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, +}; + +struct inode * configfs_new_inode(mode_t mode) +{ + struct inode * inode = new_inode(configfs_sb); + if (inode) { + inode->i_mode = mode; + inode->i_uid = 0; + inode->i_gid = 0; + inode->i_blksize = PAGE_CACHE_SIZE; + inode->i_blocks = 0; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_mapping->a_ops = &configfs_aops; + inode->i_mapping->backing_dev_info = &configfs_backing_dev_info; + } + return inode; +} + +int configfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *)) +{ + int error = 0; + struct inode * inode = NULL; + if (dentry) { + if (!dentry->d_inode) { + if ((inode = configfs_new_inode(mode))) { + if (dentry->d_parent && dentry->d_parent->d_inode) { + struct inode *p_inode = dentry->d_parent->d_inode; + p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME; + } + goto Proceed; + } + else + error = -ENOMEM; + } else + error = -EEXIST; + } else + error = -ENOENT; + goto Done; + + Proceed: + if (init) + error = init(inode); + if (!error) { + d_instantiate(dentry, inode); + if (S_ISDIR(mode) || S_ISLNK(mode)) + dget(dentry); /* pin link and directory dentries in core */ + } else + iput(inode); + Done: + return error; +} + +/* + * Get the name for corresponding element represented by the given configfs_dirent + */ +const unsigned char * configfs_get_name(struct configfs_dirent *sd) +{ + struct attribute * attr; + + if (!sd || !sd->s_element) + BUG(); + + /* These always have a dentry, so use that */ + if (sd->s_type & (CONFIGFS_DIR | CONFIGFS_ITEM_LINK)) + return sd->s_dentry->d_name.name; + + if (sd->s_type & CONFIGFS_ITEM_ATTR) { + attr = sd->s_element; + return attr->name; + } + return NULL; +} + + +/* + * Unhashes the dentry corresponding to given configfs_dirent + * Called with parent inode's i_sem held. + */ +void configfs_drop_dentry(struct configfs_dirent * sd, struct dentry * parent) +{ + struct dentry * dentry = sd->s_dentry; + + if (dentry) { + spin_lock(&dcache_lock); + if (!(d_unhashed(dentry) && dentry->d_inode)) { + dget_locked(dentry); + __d_drop(dentry); + spin_unlock(&dcache_lock); + simple_unlink(parent->d_inode, dentry); + } else + spin_unlock(&dcache_lock); + } +} + +void configfs_hash_and_remove(struct dentry * dir, const char * name) +{ + struct configfs_dirent * sd; + struct configfs_dirent * parent_sd = dir->d_fsdata; + + down(&dir->d_inode->i_sem); + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (!sd->s_element) + continue; + if (!strcmp(configfs_get_name(sd), name)) { + list_del_init(&sd->s_sibling); + configfs_drop_dentry(sd, dir); + configfs_put(sd); + break; + } + } + up(&dir->d_inode->i_sem); +} + + diff --git a/fs/configfs/item.c b/fs/configfs/item.c new file mode 100644 index 0000000..e07485a --- /dev/null +++ b/fs/configfs/item.c @@ -0,0 +1,227 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * item.c - library routines for handling generic config items + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on kobject: + * kobject is Copyright (c) 2002-2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + * + * Please see the file Documentation/filesystems/configfs.txt for + * critical information about using the config_item interface. + */ + +#include <linux/string.h> +#include <linux/module.h> +#include <linux/stat.h> +#include <linux/slab.h> + +#include <linux/configfs.h> + + +static inline struct config_item * to_item(struct list_head * entry) +{ + return container_of(entry,struct config_item,ci_entry); +} + +/* Evil kernel */ +static void config_item_release(struct kref *kref); + +/** + * config_item_init - initialize item. + * @item: item in question. + */ +void config_item_init(struct config_item * item) +{ + kref_init(&item->ci_kref); + INIT_LIST_HEAD(&item->ci_entry); +} + +/** + * config_item_set_name - Set the name of an item + * @item: item. + * @name: name. + * + * If strlen(name) >= CONFIGFS_ITEM_NAME_LEN, then use a + * dynamically allocated string that @item->ci_name points to. + * Otherwise, use the static @item->ci_namebuf array. + */ + +int config_item_set_name(struct config_item * item, const char * fmt, ...) +{ + int error = 0; + int limit = CONFIGFS_ITEM_NAME_LEN; + int need; + va_list args; + char * name; + + /* + * First, try the static array + */ + va_start(args,fmt); + need = vsnprintf(item->ci_namebuf,limit,fmt,args); + va_end(args); + if (need < limit) + name = item->ci_namebuf; + else { + /* + * Need more space? Allocate it and try again + */ + limit = need + 1; + name = kmalloc(limit,GFP_KERNEL); + if (!name) { + error = -ENOMEM; + goto Done; + } + va_start(args,fmt); + need = vsnprintf(name,limit,fmt,args); + va_end(args); + + /* Still? Give up. */ + if (need >= limit) { + kfree(name); + error = -EFAULT; + goto Done; + } + } + + /* Free the old name, if necessary. */ + if (item->ci_name && item->ci_name != item->ci_namebuf) + kfree(item->ci_name); + + /* Now, set the new name */ + item->ci_name = name; + Done: + return error; +} + +EXPORT_SYMBOL(config_item_set_name); + +void config_item_init_type_name(struct config_item *item, + const char *name, + struct config_item_type *type) +{ + config_item_set_name(item, name); + item->ci_type = type; + config_item_init(item); +} +EXPORT_SYMBOL(config_item_init_type_name); + +void config_group_init_type_name(struct config_group *group, const char *name, + struct config_item_type *type) +{ + config_item_set_name(&group->cg_item, name); + group->cg_item.ci_type = type; + config_group_init(group); +} +EXPORT_SYMBOL(config_group_init_type_name); + +struct config_item * config_item_get(struct config_item * item) +{ + if (item) + kref_get(&item->ci_kref); + return item; +} + +/** + * config_item_cleanup - free config_item resources. + * @item: item. + */ + +void config_item_cleanup(struct config_item * item) +{ + struct config_item_type * t = item->ci_type; + struct config_group * s = item->ci_group; + struct config_item * parent = item->ci_parent; + + pr_debug("config_item %s: cleaning up\n",config_item_name(item)); + if (item->ci_name != item->ci_namebuf) + kfree(item->ci_name); + item->ci_name = NULL; + if (t && t->ct_item_ops && t->ct_item_ops->release) + t->ct_item_ops->release(item); + if (s) + config_group_put(s); + if (parent) + config_item_put(parent); +} + +static void config_item_release(struct kref *kref) +{ + config_item_cleanup(container_of(kref, struct config_item, ci_kref)); +} + +/** + * config_item_put - decrement refcount for item. + * @item: item. + * + * Decrement the refcount, and if 0, call config_item_cleanup(). + */ +void config_item_put(struct config_item * item) +{ + if (item) + kref_put(&item->ci_kref, config_item_release); +} + + +/** + * config_group_init - initialize a group for use + * @k: group + */ + +void config_group_init(struct config_group *group) +{ + config_item_init(&group->cg_item); + INIT_LIST_HEAD(&group->cg_children); +} + + +/** + * config_group_find_obj - search for item in group. + * @group: group we're looking in. + * @name: item's name. + * + * Lock group via @group->cg_subsys, and iterate over @group->cg_list, + * looking for a matching config_item. If matching item is found + * take a reference and return the item. + */ + +struct config_item * config_group_find_obj(struct config_group * group, const char * name) +{ + struct list_head * entry; + struct config_item * ret = NULL; + + /* XXX LOCKING! */ + list_for_each(entry,&group->cg_children) { + struct config_item * item = to_item(entry); + if (config_item_name(item) && + !strcmp(config_item_name(item), name)) { + ret = config_item_get(item); + break; + } + } + return ret; +} + + +EXPORT_SYMBOL(config_item_init); +EXPORT_SYMBOL(config_group_init); +EXPORT_SYMBOL(config_item_get); +EXPORT_SYMBOL(config_item_put); + diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c new file mode 100644 index 0000000..1a2f6f6 --- /dev/null +++ b/fs/configfs/mount.c @@ -0,0 +1,159 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * mount.c - operations for initializing and mounting configfs. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/mount.h> +#include <linux/pagemap.h> +#include <linux/init.h> + +#include <linux/configfs.h> +#include "configfs_internal.h" + +/* Random magic number */ +#define CONFIGFS_MAGIC 0x62656570 + +struct vfsmount * configfs_mount = NULL; +struct super_block * configfs_sb = NULL; +static int configfs_mnt_count = 0; + +static struct super_operations configfs_ops = { + .statfs = simple_statfs, + .drop_inode = generic_delete_inode, +}; + +static struct config_group configfs_root_group = { + .cg_item = { + .ci_namebuf = "root", + .ci_name = configfs_root_group.cg_item.ci_namebuf, + }, +}; + +int configfs_is_root(struct config_item *item) +{ + return item == &configfs_root_group.cg_item; +} + +static struct configfs_dirent configfs_root = { + .s_sibling = LIST_HEAD_INIT(configfs_root.s_sibling), + .s_children = LIST_HEAD_INIT(configfs_root.s_children), + .s_element = &configfs_root_group.cg_item, + .s_type = CONFIGFS_ROOT, +}; + +static int configfs_fill_super(struct super_block *sb, void *data, int silent) +{ + struct inode *inode; + struct dentry *root; + + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + sb->s_magic = CONFIGFS_MAGIC; + sb->s_op = &configfs_ops; + configfs_sb = sb; + + inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO); + if (inode) { + inode->i_op = &configfs_dir_inode_operations; + inode->i_fop = &configfs_dir_operations; + /* directory inodes start off with i_nlink == 2 (for "." entry) */ + inode->i_nlink++; + } else { + pr_debug("configfs: could not get root inode\n"); + return -ENOMEM; + } + + root = d_alloc_root(inode); + if (!root) { + pr_debug("%s: could not get root dentry!\n",__FUNCTION__); + iput(inode); + return -ENOMEM; + } + config_group_init(&configfs_root_group); + configfs_root_group.cg_item.ci_dentry = root; + root->d_fsdata = &configfs_root; + sb->s_root = root; + return 0; +} + +static struct super_block *configfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_single(fs_type, flags, data, configfs_fill_super); +} + +static struct file_system_type configfs_fs_type = { + .owner = THIS_MODULE, + .name = "configfs", + .get_sb = configfs_get_sb, + .kill_sb = kill_litter_super, +}; + +int configfs_pin_fs(void) +{ + return simple_pin_fs("configfs", &configfs_mount, + &configfs_mnt_count); +} + +void configfs_release_fs(void) +{ + simple_release_fs(&configfs_mount, &configfs_mnt_count); +} + + +static decl_subsys(config, NULL, NULL); + +static int __init configfs_init(void) +{ + int err; + + kset_set_kset_s(&config_subsys, kernel_subsys); + err = subsystem_register(&config_subsys); + if (err) + return err; + + err = register_filesystem(&configfs_fs_type); + if (err) { + printk(KERN_ERR "configfs: Unable to register filesystem!\n"); + subsystem_unregister(&config_subsys); + } + + return err; +} + +static void __exit configfs_exit(void) +{ + unregister_filesystem(&configfs_fs_type); + subsystem_unregister(&config_subsys); +} + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.0.1"); +MODULE_DESCRIPTION("Simple RAM filesystem for user driven kernel subsystem configuration."); + +module_init(configfs_init); +module_exit(configfs_exit); diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c new file mode 100644 index 0000000..50f5840 --- /dev/null +++ b/fs/configfs/symlink.c @@ -0,0 +1,281 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * symlink.c - operations for configfs symlinks. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/namei.h> + +#include <linux/configfs.h> +#include "configfs_internal.h" + +static int item_depth(struct config_item * item) +{ + struct config_item * p = item; + int depth = 0; + do { depth++; } while ((p = p->ci_parent) && !configfs_is_root(p)); + return depth; +} + +static int item_path_length(struct config_item * item) +{ + struct config_item * p = item; + int length = 1; + do { + length += strlen(config_item_name(p)) + 1; + p = p->ci_parent; + } while (p && !configfs_is_root(p)); + return length; +} + +static void fill_item_path(struct config_item * item, char * buffer, int length) +{ + struct config_item * p; + + --length; + for (p = item; p && !configfs_is_root(p); p = p->ci_parent) { + int cur = strlen(config_item_name(p)); + + /* back up enough to print this bus id with '/' */ + length -= cur; + strncpy(buffer + length,config_item_name(p),cur); + *(buffer + --length) = '/'; + } +} + +static int create_link(struct config_item *parent_item, + struct config_item *item, + struct dentry *dentry) +{ + struct configfs_dirent *target_sd = item->ci_dentry->d_fsdata; + struct configfs_symlink *sl; + int ret; + + ret = -ENOMEM; + sl = kmalloc(sizeof(struct configfs_symlink), GFP_KERNEL); + if (sl) { + sl->sl_target = config_item_get(item); + /* FIXME: needs a lock, I'd bet */ + list_add(&sl->sl_list, &target_sd->s_links); + ret = configfs_create_link(sl, parent_item->ci_dentry, + dentry); + if (ret) { + list_del_init(&sl->sl_list); + config_item_put(item); + kfree(sl); + } + } + + return ret; +} + + +static int get_target(const char *symname, struct nameidata *nd, + struct config_item **target) +{ + int ret; + + ret = path_lookup(symname, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, nd); + if (!ret) { + if (nd->dentry->d_sb == configfs_sb) { + *target = configfs_get_config_item(nd->dentry); + if (!*target) { + ret = -ENOENT; + path_release(nd); + } + } else + ret = -EPERM; + } + + return ret; +} + + +int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) +{ + int ret; + struct nameidata nd; + struct config_item *parent_item; + struct config_item *target_item; + struct config_item_type *type; + + ret = -EPERM; /* What lack-of-symlink returns */ + if (dentry->d_parent == configfs_sb->s_root) + goto out; + + parent_item = configfs_get_config_item(dentry->d_parent); + type = parent_item->ci_type; + + if (!type || !type->ct_item_ops || + !type->ct_item_ops->allow_link) + goto out_put; + + ret = get_target(symname, &nd, &target_item); + if (ret) + goto out_put; + + ret = type->ct_item_ops->allow_link(parent_item, target_item); + if (!ret) + ret = create_link(parent_item, target_item, dentry); + + config_item_put(target_item); + path_release(&nd); + +out_put: + config_item_put(parent_item); + +out: + return ret; +} + +int configfs_unlink(struct inode *dir, struct dentry *dentry) +{ + struct configfs_dirent *sd = dentry->d_fsdata; + struct configfs_symlink *sl; + struct config_item *parent_item; + struct config_item_type *type; + int ret; + + ret = -EPERM; /* What lack-of-symlink returns */ + if (!(sd->s_type & CONFIGFS_ITEM_LINK)) + goto out; + + if (dentry->d_parent == configfs_sb->s_root) + BUG(); + + sl = sd->s_element; + + parent_item = configfs_get_config_item(dentry->d_parent); + type = parent_item->ci_type; + + list_del_init(&sd->s_sibling); + configfs_drop_dentry(sd, dentry->d_parent); + dput(dentry); + configfs_put(sd); + + /* + * drop_link() must be called before + * list_del_init(&sl->sl_list), so that the order of + * drop_link(this, target) and drop_item(target) is preserved. + */ + if (type && type->ct_item_ops && + type->ct_item_ops->drop_link) + type->ct_item_ops->drop_link(parent_item, + sl->sl_target); + + /* FIXME: Needs lock */ + list_del_init(&sl->sl_list); + + /* Put reference from create_link() */ + config_item_put(sl->sl_target); + kfree(sl); + + config_item_put(parent_item); + + ret = 0; + +out: + return ret; +} + +static int configfs_get_target_path(struct config_item * item, struct config_item * target, + char *path) +{ + char * s; + int depth, size; + + depth = item_depth(item); + size = item_path_length(target) + depth * 3 - 1; + if (size > PATH_MAX) + return -ENAMETOOLONG; + + pr_debug("%s: depth = %d, size = %d\n", __FUNCTION__, depth, size); + + for (s = path; depth--; s += 3) + strcpy(s,"../"); + + fill_item_path(target, path, size); + pr_debug("%s: path = '%s'\n", __FUNCTION__, path); + + return 0; +} + +static int configfs_getlink(struct dentry *dentry, char * path) +{ + struct config_item *item, *target_item; + int error = 0; + + item = configfs_get_config_item(dentry->d_parent); + if (!item) + return -EINVAL; + + target_item = configfs_get_config_item(dentry); + if (!target_item) { + config_item_put(item); + return -EINVAL; + } + + down_read(&configfs_rename_sem); + error = configfs_get_target_path(item, target_item, path); + up_read(&configfs_rename_sem); + + config_item_put(item); + config_item_put(target_item); + return error; + +} + +static void *configfs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + int error = -ENOMEM; + unsigned long page = get_zeroed_page(GFP_KERNEL); + + if (page) { + error = configfs_getlink(dentry, (char *)page); + if (!error) { + nd_set_link(nd, (char *)page); + return (void *)page; + } + } + + nd_set_link(nd, ERR_PTR(error)); + return NULL; +} + +static void configfs_put_link(struct dentry *dentry, struct nameidata *nd, + void *cookie) +{ + if (cookie) { + unsigned long page = (unsigned long)cookie; + free_page(page); + } +} + +struct inode_operations configfs_symlink_inode_operations = { + .follow_link = configfs_follow_link, + .readlink = generic_readlink, + .put_link = configfs_put_link, +}; + @@ -721,7 +721,7 @@ retry: &last_block_in_bio, &ret, wbc, page->mapping->a_ops->writepage); } - if (unlikely(ret == WRITEPAGE_ACTIVATE)) + if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) unlock_page(page); if (ret || (--(wbc->nr_to_write) <= 0)) done = 1; diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile new file mode 100644 index 0000000..7d3be84 --- /dev/null +++ b/fs/ocfs2/Makefile @@ -0,0 +1,33 @@ +EXTRA_CFLAGS += -Ifs/ocfs2 + +EXTRA_CFLAGS += -DCATCH_BH_JBD_RACES + +obj-$(CONFIG_OCFS2_FS) += ocfs2.o + +ocfs2-objs := \ + alloc.o \ + aops.o \ + buffer_head_io.o \ + dcache.o \ + dir.o \ + dlmglue.o \ + export.o \ + extent_map.o \ + file.o \ + heartbeat.o \ + inode.o \ + journal.o \ + localalloc.o \ + mmap.o \ + namei.o \ + slot_map.o \ + suballoc.o \ + super.o \ + symlink.o \ + sysfile.o \ + uptodate.o \ + ver.o \ + vote.o + +obj-$(CONFIG_OCFS2_FS) += cluster/ +obj-$(CONFIG_OCFS2_FS) += dlm/ diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c new file mode 100644 index 0000000..465f797 --- /dev/null +++ b/fs/ocfs2/alloc.c @@ -0,0 +1,2040 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * alloc.c + * + * Extent allocs and frees + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#define MLOG_MASK_PREFIX ML_DISK_ALLOC +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "suballoc.h" +#include "sysfile.h" +#include "file.h" +#include "super.h" +#include "uptodate.h" + +#include "buffer_head_io.h" + +static int ocfs2_extent_contig(struct inode *inode, + struct ocfs2_extent_rec *ext, + u64 blkno); + +static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + int wanted, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head *bhs[]); + +static int ocfs2_add_branch(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + struct buffer_head *eb_bh, + struct buffer_head *last_eb_bh, + struct ocfs2_alloc_context *meta_ac); + +static int ocfs2_shift_tree_depth(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head **ret_new_eb_bh); + +static int ocfs2_do_insert_extent(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 blkno, + u32 new_clusters); + +static int ocfs2_find_branch_target(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct buffer_head **target_bh); + +static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb, + struct inode *inode, + struct ocfs2_dinode *fe, + unsigned int new_i_clusters, + struct buffer_head *old_last_eb, + struct buffer_head **new_last_eb); + +static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc); + +static int ocfs2_extent_contig(struct inode *inode, + struct ocfs2_extent_rec *ext, + u64 blkno) +{ + return blkno == (le64_to_cpu(ext->e_blkno) + + ocfs2_clusters_to_blocks(inode->i_sb, + le32_to_cpu(ext->e_clusters))); +} + +/* + * How many free extents have we got before we need more meta data? + */ +int ocfs2_num_free_extents(struct ocfs2_super *osb, + struct inode *inode, + struct ocfs2_dinode *fe) +{ + int retval; + struct ocfs2_extent_list *el; + struct ocfs2_extent_block *eb; + struct buffer_head *eb_bh = NULL; + + mlog_entry_void(); + + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); + retval = -EIO; + goto bail; + } + + if (fe->i_last_eb_blk) { + retval = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk), + &eb_bh, OCFS2_BH_CACHED, inode); + if (retval < 0) { + mlog_errno(retval); + goto bail; + } + eb = (struct ocfs2_extent_block *) eb_bh->b_data; + el = &eb->h_list; + } else + el = &fe->id2.i_list; + + BUG_ON(el->l_tree_depth != 0); + + retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec); +bail: + if (eb_bh) + brelse(eb_bh); + + mlog_exit(retval); + return retval; +} + +/* expects array to already be allocated + * + * sets h_signature, h_blkno, h_suballoc_bit, h_suballoc_slot, and + * l_count for you + */ +static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + int wanted, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head *bhs[]) +{ + int count, status, i; + u16 suballoc_bit_start; + u32 num_got; + u64 first_blkno; + struct ocfs2_extent_block *eb; + + mlog_entry_void(); + + count = 0; + while (count < wanted) { + status = ocfs2_claim_metadata(osb, + handle, + meta_ac, + wanted - count, + &suballoc_bit_start, + &num_got, + &first_blkno); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + for(i = count; i < (num_got + count); i++) { + bhs[i] = sb_getblk(osb->sb, first_blkno); + if (bhs[i] == NULL) { + status = -EIO; + mlog_errno(status); + goto bail; + } + ocfs2_set_new_buffer_uptodate(inode, bhs[i]); + + status = ocfs2_journal_access(handle, inode, bhs[i], + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + memset(bhs[i]->b_data, 0, osb->sb->s_blocksize); + eb = (struct ocfs2_extent_block *) bhs[i]->b_data; + /* Ok, setup the minimal stuff here. */ + strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE); + eb->h_blkno = cpu_to_le64(first_blkno); + eb->h_fs_generation = cpu_to_le32(osb->fs_generation); + +#ifndef OCFS2_USE_ALL_METADATA_SUBALLOCATORS + /* we always use slot zero's suballocator */ + eb->h_suballoc_slot = 0; +#else + eb->h_suballoc_slot = cpu_to_le16(osb->slot_num); +#endif + eb->h_suballoc_bit = cpu_to_le16(suballoc_bit_start); + eb->h_list.l_count = + cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb)); + + suballoc_bit_start++; + first_blkno++; + + /* We'll also be dirtied by the caller, so + * this isn't absolutely necessary. */ + status = ocfs2_journal_dirty(handle, bhs[i]); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + count += num_got; + } + + status = 0; +bail: + if (status < 0) { + for(i = 0; i < wanted; i++) { + if (bhs[i]) + brelse(bhs[i]); + bhs[i] = NULL; + } + } + mlog_exit(status); + return status; +} + +/* + * Add an entire tree branch to our inode. eb_bh is the extent block + * to start at, if we don't want to start the branch at the dinode + * structure. + * + * last_eb_bh is required as we have to update it's next_leaf pointer + * for the new last extent block. + * + * the new branch will be 'empty' in the sense that every block will + * contain a single record with e_clusters == 0. + */ +static int ocfs2_add_branch(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + struct buffer_head *eb_bh, + struct buffer_head *last_eb_bh, + struct ocfs2_alloc_context *meta_ac) +{ + int status, new_blocks, i; + u64 next_blkno, new_last_eb_blk; + struct buffer_head *bh; + struct buffer_head **new_eb_bhs = NULL; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *eb_el; + struct ocfs2_extent_list *el; + + mlog_entry_void(); + + BUG_ON(!last_eb_bh); + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + if (eb_bh) { + eb = (struct ocfs2_extent_block *) eb_bh->b_data; + el = &eb->h_list; + } else + el = &fe->id2.i_list; + + /* we never add a branch to a leaf. */ + BUG_ON(!el->l_tree_depth); + + new_blocks = le16_to_cpu(el->l_tree_depth); + + /* allocate the number of new eb blocks we need */ + new_eb_bhs = kcalloc(new_blocks, sizeof(struct buffer_head *), + GFP_KERNEL); + if (!new_eb_bhs) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + status = ocfs2_create_new_meta_bhs(osb, handle, inode, new_blocks, + meta_ac, new_eb_bhs); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* Note: new_eb_bhs[new_blocks - 1] is the guy which will be + * linked with the rest of the tree. + * conversly, new_eb_bhs[0] is the new bottommost leaf. + * + * when we leave the loop, new_last_eb_blk will point to the + * newest leaf, and next_blkno will point to the topmost extent + * block. */ + next_blkno = new_last_eb_blk = 0; + for(i = 0; i < new_blocks; i++) { + bh = new_eb_bhs[i]; + eb = (struct ocfs2_extent_block *) bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + eb_el = &eb->h_list; + + status = ocfs2_journal_access(handle, inode, bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb->h_next_leaf_blk = 0; + eb_el->l_tree_depth = cpu_to_le16(i); + eb_el->l_next_free_rec = cpu_to_le16(1); + eb_el->l_recs[0].e_cpos = fe->i_clusters; + eb_el->l_recs[0].e_blkno = cpu_to_le64(next_blkno); + eb_el->l_recs[0].e_clusters = cpu_to_le32(0); + if (!eb_el->l_tree_depth) + new_last_eb_blk = le64_to_cpu(eb->h_blkno); + + status = ocfs2_journal_dirty(handle, bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + next_blkno = le64_to_cpu(eb->h_blkno); + } + + /* This is a bit hairy. We want to update up to three blocks + * here without leaving any of them in an inconsistent state + * in case of error. We don't have to worry about + * journal_dirty erroring as it won't unless we've aborted the + * handle (in which case we would never be here) so reserving + * the write with journal_access is all we need to do. */ + status = ocfs2_journal_access(handle, inode, last_eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + if (eb_bh) { + status = ocfs2_journal_access(handle, inode, eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* Link the new branch into the rest of the tree (el will + * either be on the fe, or the extent block passed in. */ + i = le16_to_cpu(el->l_next_free_rec); + el->l_recs[i].e_blkno = cpu_to_le64(next_blkno); + el->l_recs[i].e_cpos = fe->i_clusters; + el->l_recs[i].e_clusters = 0; + le16_add_cpu(&el->l_next_free_rec, 1); + + /* fe needs a new last extent block pointer, as does the + * next_leaf on the previously last-extent-block. */ + fe->i_last_eb_blk = cpu_to_le64(new_last_eb_blk); + + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + eb->h_next_leaf_blk = cpu_to_le64(new_last_eb_blk); + + status = ocfs2_journal_dirty(handle, last_eb_bh); + if (status < 0) + mlog_errno(status); + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) + mlog_errno(status); + if (eb_bh) { + status = ocfs2_journal_dirty(handle, eb_bh); + if (status < 0) + mlog_errno(status); + } + + status = 0; +bail: + if (new_eb_bhs) { + for (i = 0; i < new_blocks; i++) + if (new_eb_bhs[i]) + brelse(new_eb_bhs[i]); + kfree(new_eb_bhs); + } + + mlog_exit(status); + return status; +} + +/* + * adds another level to the allocation tree. + * returns back the new extent block so you can add a branch to it + * after this call. + */ +static int ocfs2_shift_tree_depth(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head **ret_new_eb_bh) +{ + int status, i; + struct buffer_head *new_eb_bh = NULL; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *fe_el; + struct ocfs2_extent_list *eb_el; + + mlog_entry_void(); + + status = ocfs2_create_new_meta_bhs(osb, handle, inode, 1, meta_ac, + &new_eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb = (struct ocfs2_extent_block *) new_eb_bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + + eb_el = &eb->h_list; + fe = (struct ocfs2_dinode *) fe_bh->b_data; + fe_el = &fe->id2.i_list; + + status = ocfs2_journal_access(handle, inode, new_eb_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* copy the fe data into the new extent block */ + eb_el->l_tree_depth = fe_el->l_tree_depth; + eb_el->l_next_free_rec = fe_el->l_next_free_rec; + for(i = 0; i < le16_to_cpu(fe_el->l_next_free_rec); i++) { + eb_el->l_recs[i].e_cpos = fe_el->l_recs[i].e_cpos; + eb_el->l_recs[i].e_clusters = fe_el->l_recs[i].e_clusters; + eb_el->l_recs[i].e_blkno = fe_el->l_recs[i].e_blkno; + } + + status = ocfs2_journal_dirty(handle, new_eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* update fe now */ + le16_add_cpu(&fe_el->l_tree_depth, 1); + fe_el->l_recs[0].e_cpos = 0; + fe_el->l_recs[0].e_blkno = eb->h_blkno; + fe_el->l_recs[0].e_clusters = fe->i_clusters; + for(i = 1; i < le16_to_cpu(fe_el->l_next_free_rec); i++) { + fe_el->l_recs[i].e_cpos = 0; + fe_el->l_recs[i].e_clusters = 0; + fe_el->l_recs[i].e_blkno = 0; + } + fe_el->l_next_free_rec = cpu_to_le16(1); + + /* If this is our 1st tree depth shift, then last_eb_blk + * becomes the allocated extent block */ + if (fe_el->l_tree_depth == cpu_to_le16(1)) + fe->i_last_eb_blk = eb->h_blkno; + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + *ret_new_eb_bh = new_eb_bh; + new_eb_bh = NULL; + status = 0; +bail: + if (new_eb_bh) + brelse(new_eb_bh); + + mlog_exit(status); + return status; +} + +/* + * Expects the tree to already have room in the rightmost leaf for the + * extent. Updates all the extent blocks (and the dinode) on the way + * down. + */ +static int ocfs2_do_insert_extent(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 start_blk, + u32 new_clusters) +{ + int status, i, num_bhs = 0; + u64 next_blkno; + u16 next_free; + struct buffer_head **eb_bhs = NULL; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + + mlog_entry_void(); + + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + el = &fe->id2.i_list; + if (el->l_tree_depth) { + /* This is another operation where we want to be + * careful about our tree updates. An error here means + * none of the previous changes we made should roll + * forward. As a result, we have to record the buffers + * for this part of the tree in an array and reserve a + * journal write to them before making any changes. */ + num_bhs = le16_to_cpu(fe->id2.i_list.l_tree_depth); + eb_bhs = kcalloc(num_bhs, sizeof(struct buffer_head *), + GFP_KERNEL); + if (!eb_bhs) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + i = 0; + while(el->l_tree_depth) { + next_free = le16_to_cpu(el->l_next_free_rec); + if (next_free == 0) { + ocfs2_error(inode->i_sb, + "Dinode %"MLFu64" has a bad " + "extent list", + OCFS2_I(inode)->ip_blkno); + status = -EIO; + goto bail; + } + next_blkno = le64_to_cpu(el->l_recs[next_free - 1].e_blkno); + + BUG_ON(i >= num_bhs); + status = ocfs2_read_block(osb, next_blkno, &eb_bhs[i], + OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, + eb); + status = -EIO; + goto bail; + } + + status = ocfs2_journal_access(handle, inode, eb_bhs[i], + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + el = &eb->h_list; + i++; + /* When we leave this loop, eb_bhs[num_bhs - 1] will + * hold the bottom-most leaf extent block. */ + } + BUG_ON(el->l_tree_depth); + + el = &fe->id2.i_list; + /* If we have tree depth, then the fe update is + * trivial, and we want to switch el out for the + * bottom-most leaf in order to update it with the + * actual extent data below. */ + next_free = le16_to_cpu(el->l_next_free_rec); + if (next_free == 0) { + ocfs2_error(inode->i_sb, + "Dinode %"MLFu64" has a bad " + "extent list", + OCFS2_I(inode)->ip_blkno); + status = -EIO; + goto bail; + } + le32_add_cpu(&el->l_recs[next_free - 1].e_clusters, + new_clusters); + /* (num_bhs - 1) to avoid the leaf */ + for(i = 0; i < (num_bhs - 1); i++) { + eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data; + el = &eb->h_list; + + /* finally, make our actual change to the + * intermediate extent blocks. */ + next_free = le16_to_cpu(el->l_next_free_rec); + le32_add_cpu(&el->l_recs[next_free - 1].e_clusters, + new_clusters); + + status = ocfs2_journal_dirty(handle, eb_bhs[i]); + if (status < 0) + mlog_errno(status); + } + BUG_ON(i != (num_bhs - 1)); + /* note that the leaf block wasn't touched in + * the loop above */ + eb = (struct ocfs2_extent_block *) eb_bhs[num_bhs - 1]->b_data; + el = &eb->h_list; + BUG_ON(el->l_tree_depth); + } + + /* yay, we can finally add the actual extent now! */ + i = le16_to_cpu(el->l_next_free_rec) - 1; + if (le16_to_cpu(el->l_next_free_rec) && + ocfs2_extent_contig(inode, &el->l_recs[i], start_blk)) { + le32_add_cpu(&el->l_recs[i].e_clusters, new_clusters); + } else if (le16_to_cpu(el->l_next_free_rec) && + (le32_to_cpu(el->l_recs[i].e_clusters) == 0)) { + /* having an empty extent at eof is legal. */ + if (el->l_recs[i].e_cpos != fe->i_clusters) { + ocfs2_error(inode->i_sb, + "Dinode %"MLFu64" trailing extent is bad: " + "cpos (%u) != number of clusters (%u)", + le32_to_cpu(el->l_recs[i].e_cpos), + le32_to_cpu(fe->i_clusters)); + status = -EIO; + goto bail; + } + el->l_recs[i].e_blkno = cpu_to_le64(start_blk); + el->l_recs[i].e_clusters = cpu_to_le32(new_clusters); + } else { + /* No contiguous record, or no empty record at eof, so + * we add a new one. */ + + BUG_ON(le16_to_cpu(el->l_next_free_rec) >= + le16_to_cpu(el->l_count)); + i = le16_to_cpu(el->l_next_free_rec); + + el->l_recs[i].e_blkno = cpu_to_le64(start_blk); + el->l_recs[i].e_clusters = cpu_to_le32(new_clusters); + el->l_recs[i].e_cpos = fe->i_clusters; + le16_add_cpu(&el->l_next_free_rec, 1); + } + + /* + * extent_map errors are not fatal, so they are ignored outside + * of flushing the thing. + */ + status = ocfs2_extent_map_append(inode, &el->l_recs[i], + new_clusters); + if (status) { + mlog_errno(status); + ocfs2_extent_map_drop(inode, le32_to_cpu(fe->i_clusters)); + } + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) + mlog_errno(status); + if (fe->id2.i_list.l_tree_depth) { + status = ocfs2_journal_dirty(handle, eb_bhs[num_bhs - 1]); + if (status < 0) + mlog_errno(status); + } + + status = 0; +bail: + if (eb_bhs) { + for (i = 0; i < num_bhs; i++) + if (eb_bhs[i]) + brelse(eb_bhs[i]); + kfree(eb_bhs); + } + + mlog_exit(status); + return status; +} + +/* + * Should only be called when there is no space left in any of the + * leaf nodes. What we want to do is find the lowest tree depth + * non-leaf extent block with room for new records. There are three + * valid results of this search: + * + * 1) a lowest extent block is found, then we pass it back in + * *lowest_eb_bh and return '0' + * + * 2) the search fails to find anything, but the dinode has room. We + * pass NULL back in *lowest_eb_bh, but still return '0' + * + * 3) the search fails to find anything AND the dinode is full, in + * which case we return > 0 + * + * return status < 0 indicates an error. + */ +static int ocfs2_find_branch_target(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct buffer_head **target_bh) +{ + int status = 0, i; + u64 blkno; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *bh = NULL; + struct buffer_head *lowest_bh = NULL; + + mlog_entry_void(); + + *target_bh = NULL; + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + el = &fe->id2.i_list; + + while(le16_to_cpu(el->l_tree_depth) > 1) { + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ocfs2_error(inode->i_sb, "Dinode %"MLFu64" has empty " + "extent list (next_free_rec == 0)", + OCFS2_I(inode)->ip_blkno); + status = -EIO; + goto bail; + } + i = le16_to_cpu(el->l_next_free_rec) - 1; + blkno = le64_to_cpu(el->l_recs[i].e_blkno); + if (!blkno) { + ocfs2_error(inode->i_sb, "Dinode %"MLFu64" has extent " + "list where extent # %d has no physical " + "block start", + OCFS2_I(inode)->ip_blkno, i); + status = -EIO; + goto bail; + } + + if (bh) { + brelse(bh); + bh = NULL; + } + + status = ocfs2_read_block(osb, blkno, &bh, OCFS2_BH_CACHED, + inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb = (struct ocfs2_extent_block *) bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + el = &eb->h_list; + + if (le16_to_cpu(el->l_next_free_rec) < + le16_to_cpu(el->l_count)) { + if (lowest_bh) + brelse(lowest_bh); + lowest_bh = bh; + get_bh(lowest_bh); + } + } + + /* If we didn't find one and the fe doesn't have any room, + * then return '1' */ + if (!lowest_bh + && (fe->id2.i_list.l_next_free_rec == fe->id2.i_list.l_count)) + status = 1; + + *target_bh = lowest_bh; +bail: + if (bh) + brelse(bh); + + mlog_exit(status); + return status; +} + +/* the caller needs to update fe->i_clusters */ +int ocfs2_insert_extent(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 start_blk, + u32 new_clusters, + struct ocfs2_alloc_context *meta_ac) +{ + int status, i, shift; + struct buffer_head *last_eb_bh = NULL; + struct buffer_head *bh = NULL; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + + mlog_entry_void(); + + mlog(0, "add %u clusters starting at block %"MLFu64" to " + "inode %"MLFu64"\n", + new_clusters, start_blk, OCFS2_I(inode)->ip_blkno); + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + el = &fe->id2.i_list; + + if (el->l_tree_depth) { + /* jump to end of tree */ + status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk), + &last_eb_bh, OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_exit(status); + goto bail; + } + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + el = &eb->h_list; + } + + /* Can we allocate without adding/shifting tree bits? */ + i = le16_to_cpu(el->l_next_free_rec) - 1; + if (le16_to_cpu(el->l_next_free_rec) == 0 + || (le16_to_cpu(el->l_next_free_rec) < le16_to_cpu(el->l_count)) + || le32_to_cpu(el->l_recs[i].e_clusters) == 0 + || ocfs2_extent_contig(inode, &el->l_recs[i], start_blk)) + goto out_add; + + mlog(0, "ocfs2_allocate_extent: couldn't do a simple add, traversing " + "tree now.\n"); + + shift = ocfs2_find_branch_target(osb, inode, fe_bh, &bh); + if (shift < 0) { + status = shift; + mlog_errno(status); + goto bail; + } + + /* We traveled all the way to the bottom of the allocation tree + * and didn't find room for any more extents - we need to add + * another tree level */ + if (shift) { + /* if we hit a leaf, we'd better be empty :) */ + BUG_ON(le16_to_cpu(el->l_next_free_rec) != + le16_to_cpu(el->l_count)); + BUG_ON(bh); + mlog(0, "ocfs2_allocate_extent: need to shift tree depth " + "(current = %u)\n", + le16_to_cpu(fe->id2.i_list.l_tree_depth)); + + /* ocfs2_shift_tree_depth will return us a buffer with + * the new extent block (so we can pass that to + * ocfs2_add_branch). */ + status = ocfs2_shift_tree_depth(osb, handle, inode, fe_bh, + meta_ac, &bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + /* Special case: we have room now if we shifted from + * tree_depth 0 */ + if (fe->id2.i_list.l_tree_depth == cpu_to_le16(1)) + goto out_add; + } + + /* call ocfs2_add_branch to add the final part of the tree with + * the new data. */ + mlog(0, "ocfs2_allocate_extent: add branch. bh = %p\n", bh); + status = ocfs2_add_branch(osb, handle, inode, fe_bh, bh, last_eb_bh, + meta_ac); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +out_add: + /* Finally, we can add clusters. */ + status = ocfs2_do_insert_extent(osb, handle, inode, fe_bh, + start_blk, new_clusters); + if (status < 0) + mlog_errno(status); + +bail: + if (bh) + brelse(bh); + + if (last_eb_bh) + brelse(last_eb_bh); + + mlog_exit(status); + return status; +} + +static inline int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb) +{ + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + + mlog_bug_on_msg(le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count), + "slot %d, invalid truncate log parameters: used = " + "%u, count = %u\n", osb->slot_num, + le16_to_cpu(tl->tl_used), le16_to_cpu(tl->tl_count)); + return le16_to_cpu(tl->tl_used) == le16_to_cpu(tl->tl_count); +} + +static int ocfs2_truncate_log_can_coalesce(struct ocfs2_truncate_log *tl, + unsigned int new_start) +{ + unsigned int tail_index; + unsigned int current_tail; + + /* No records, nothing to coalesce */ + if (!le16_to_cpu(tl->tl_used)) + return 0; + + tail_index = le16_to_cpu(tl->tl_used) - 1; + current_tail = le32_to_cpu(tl->tl_recs[tail_index].t_start); + current_tail += le32_to_cpu(tl->tl_recs[tail_index].t_clusters); + + return current_tail == new_start; +} + +static int ocfs2_truncate_log_append(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + u64 start_blk, + unsigned int num_clusters) +{ + int status, index; + unsigned int start_cluster, tl_count; + struct inode *tl_inode = osb->osb_tl_inode; + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + mlog_entry("start_blk = %"MLFu64", num_clusters = %u\n", start_blk, + num_clusters); + + BUG_ON(!down_trylock(&tl_inode->i_sem)); + + start_cluster = ocfs2_blocks_to_clusters(osb->sb, start_blk); + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + if (!OCFS2_IS_VALID_DINODE(di)) { + OCFS2_RO_ON_INVALID_DINODE(osb->sb, di); + status = -EIO; + goto bail; + } + + tl_count = le16_to_cpu(tl->tl_count); + mlog_bug_on_msg(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) || + tl_count == 0, + "Truncate record count on #%"MLFu64" invalid (" + "wanted %u, actual %u\n", OCFS2_I(tl_inode)->ip_blkno, + ocfs2_truncate_recs_per_inode(osb->sb), + le16_to_cpu(tl->tl_count)); + + /* Caller should have known to flush before calling us. */ + index = le16_to_cpu(tl->tl_used); + if (index >= tl_count) { + status = -ENOSPC; + mlog_errno(status); + goto bail; + } + + status = ocfs2_journal_access(handle, tl_inode, tl_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + mlog(0, "Log truncate of %u clusters starting at cluster %u to " + "%"MLFu64" (index = %d)\n", num_clusters, start_cluster, + OCFS2_I(tl_inode)->ip_blkno, index); + + if (ocfs2_truncate_log_can_coalesce(tl, start_cluster)) { + /* + * Move index back to the record we are coalescing with. + * ocfs2_truncate_log_can_coalesce() guarantees nonzero + */ + index--; + + num_clusters += le32_to_cpu(tl->tl_recs[index].t_clusters); + mlog(0, "Coalesce with index %u (start = %u, clusters = %u)\n", + index, le32_to_cpu(tl->tl_recs[index].t_start), + num_clusters); + } else { + tl->tl_recs[index].t_start = cpu_to_le32(start_cluster); + tl->tl_used = cpu_to_le16(index + 1); + } + tl->tl_recs[index].t_clusters = cpu_to_le32(num_clusters); + + status = ocfs2_journal_dirty(handle, tl_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_replay_truncate_records(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *data_alloc_inode, + struct buffer_head *data_alloc_bh) +{ + int status = 0; + int i; + unsigned int num_clusters; + u64 start_blk; + struct ocfs2_truncate_rec rec; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + struct inode *tl_inode = osb->osb_tl_inode; + struct buffer_head *tl_bh = osb->osb_tl_bh; + + mlog_entry_void(); + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + i = le16_to_cpu(tl->tl_used) - 1; + while (i >= 0) { + /* Caller has given us at least enough credits to + * update the truncate log dinode */ + status = ocfs2_journal_access(handle, tl_inode, tl_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + tl->tl_used = cpu_to_le16(i); + + status = ocfs2_journal_dirty(handle, tl_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* TODO: Perhaps we can calculate the bulk of the + * credits up front rather than extending like + * this. */ + status = ocfs2_extend_trans(handle, + OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + rec = tl->tl_recs[i]; + start_blk = ocfs2_clusters_to_blocks(data_alloc_inode->i_sb, + le32_to_cpu(rec.t_start)); + num_clusters = le32_to_cpu(rec.t_clusters); + + /* if start_blk is not set, we ignore the record as + * invalid. */ + if (start_blk) { + mlog(0, "free record %d, start = %u, clusters = %u\n", + i, le32_to_cpu(rec.t_start), num_clusters); + + status = ocfs2_free_clusters(handle, data_alloc_inode, + data_alloc_bh, start_blk, + num_clusters); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + i--; + } + +bail: + mlog_exit(status); + return status; +} + +/* Expects you to already be holding tl_inode->i_sem */ +static int __ocfs2_flush_truncate_log(struct ocfs2_super *osb) +{ + int status; + unsigned int num_to_flush; + struct ocfs2_journal_handle *handle = NULL; + struct inode *tl_inode = osb->osb_tl_inode; + struct inode *data_alloc_inode = NULL; + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct buffer_head *data_alloc_bh = NULL; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + mlog_entry_void(); + + BUG_ON(!down_trylock(&tl_inode->i_sem)); + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + if (!OCFS2_IS_VALID_DINODE(di)) { + OCFS2_RO_ON_INVALID_DINODE(osb->sb, di); + status = -EIO; + goto bail; + } + + num_to_flush = le16_to_cpu(tl->tl_used); + mlog(0, "Flush %u records from truncate log #%"MLFu64"\n", + num_to_flush, OCFS2_I(tl_inode)->ip_blkno); + if (!num_to_flush) { + status = 0; + goto bail; + } + + handle = ocfs2_alloc_handle(osb); + if (!handle) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + data_alloc_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!data_alloc_inode) { + status = -EINVAL; + mlog(ML_ERROR, "Could not get bitmap inode!\n"); + goto bail; + } + + ocfs2_handle_add_inode(handle, data_alloc_inode); + status = ocfs2_meta_lock(data_alloc_inode, handle, &data_alloc_bh, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_TRUNCATE_LOG_UPDATE); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_replay_truncate_records(osb, handle, data_alloc_inode, + data_alloc_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (data_alloc_inode) + iput(data_alloc_inode); + + if (data_alloc_bh) + brelse(data_alloc_bh); + + mlog_exit(status); + return status; +} + +int ocfs2_flush_truncate_log(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = osb->osb_tl_inode; + + down(&tl_inode->i_sem); + status = __ocfs2_flush_truncate_log(osb); + up(&tl_inode->i_sem); + + return status; +} + +static void ocfs2_truncate_log_worker(void *data) +{ + int status; + struct ocfs2_super *osb = data; + + mlog_entry_void(); + + status = ocfs2_flush_truncate_log(osb); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); +} + +#define OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL (2 * HZ) +void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, + int cancel) +{ + if (osb->osb_tl_inode) { + /* We want to push off log flushes while truncates are + * still running. */ + if (cancel) + cancel_delayed_work(&osb->osb_truncate_log_wq); + + queue_delayed_work(ocfs2_wq, &osb->osb_truncate_log_wq, + OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL); + } +} + +static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb, + int slot_num, + struct inode **tl_inode, + struct buffer_head **tl_bh) +{ + int status; + struct inode *inode = NULL; + struct buffer_head *bh = NULL; + + inode = ocfs2_get_system_file_inode(osb, + TRUNCATE_LOG_SYSTEM_INODE, + slot_num); + if (!inode) { + status = -EINVAL; + mlog(ML_ERROR, "Could not get load truncate log inode!\n"); + goto bail; + } + + status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, + OCFS2_BH_CACHED, inode); + if (status < 0) { + iput(inode); + mlog_errno(status); + goto bail; + } + + *tl_inode = inode; + *tl_bh = bh; +bail: + mlog_exit(status); + return status; +} + +/* called during the 1st stage of node recovery. we stamp a clean + * truncate log and pass back a copy for processing later. if the + * truncate log does not require processing, a *tl_copy is set to + * NULL. */ +int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, + int slot_num, + struct ocfs2_dinode **tl_copy) +{ + int status; + struct inode *tl_inode = NULL; + struct buffer_head *tl_bh = NULL; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + *tl_copy = NULL; + + mlog(0, "recover truncate log from slot %d\n", slot_num); + + status = ocfs2_get_truncate_log_info(osb, slot_num, &tl_inode, &tl_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + if (!OCFS2_IS_VALID_DINODE(di)) { + OCFS2_RO_ON_INVALID_DINODE(tl_inode->i_sb, di); + status = -EIO; + goto bail; + } + + if (le16_to_cpu(tl->tl_used)) { + mlog(0, "We'll have %u logs to recover\n", + le16_to_cpu(tl->tl_used)); + + *tl_copy = kmalloc(tl_bh->b_size, GFP_KERNEL); + if (!(*tl_copy)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* Assuming the write-out below goes well, this copy + * will be passed back to recovery for processing. */ + memcpy(*tl_copy, tl_bh->b_data, tl_bh->b_size); + + /* All we need to do to clear the truncate log is set + * tl_used. */ + tl->tl_used = 0; + + status = ocfs2_write_block(osb, tl_bh, tl_inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + +bail: + if (tl_inode) + iput(tl_inode); + if (tl_bh) + brelse(tl_bh); + + if (status < 0 && (*tl_copy)) { + kfree(*tl_copy); + *tl_copy = NULL; + } + + mlog_exit(status); + return status; +} + +int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, + struct ocfs2_dinode *tl_copy) +{ + int status = 0; + int i; + unsigned int clusters, num_recs, start_cluster; + u64 start_blk; + struct ocfs2_journal_handle *handle; + struct inode *tl_inode = osb->osb_tl_inode; + struct ocfs2_truncate_log *tl; + + mlog_entry_void(); + + if (OCFS2_I(tl_inode)->ip_blkno == le64_to_cpu(tl_copy->i_blkno)) { + mlog(ML_ERROR, "Asked to recover my own truncate log!\n"); + return -EINVAL; + } + + tl = &tl_copy->id2.i_dealloc; + num_recs = le16_to_cpu(tl->tl_used); + mlog(0, "cleanup %u records from %"MLFu64"\n", num_recs, + tl_copy->i_blkno); + + down(&tl_inode->i_sem); + for(i = 0; i < num_recs; i++) { + if (ocfs2_truncate_log_needs_flush(osb)) { + status = __ocfs2_flush_truncate_log(osb); + if (status < 0) { + mlog_errno(status); + goto bail_up; + } + } + + handle = ocfs2_start_trans(osb, NULL, + OCFS2_TRUNCATE_LOG_UPDATE); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto bail_up; + } + + clusters = le32_to_cpu(tl->tl_recs[i].t_clusters); + start_cluster = le32_to_cpu(tl->tl_recs[i].t_start); + start_blk = ocfs2_clusters_to_blocks(osb->sb, start_cluster); + + status = ocfs2_truncate_log_append(osb, handle, + start_blk, clusters); + ocfs2_commit_trans(handle); + if (status < 0) { + mlog_errno(status); + goto bail_up; + } + } + +bail_up: + up(&tl_inode->i_sem); + + mlog_exit(status); + return status; +} + +void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = osb->osb_tl_inode; + + mlog_entry_void(); + + if (tl_inode) { + cancel_delayed_work(&osb->osb_truncate_log_wq); + flush_workqueue(ocfs2_wq); + + status = ocfs2_flush_truncate_log(osb); + if (status < 0) + mlog_errno(status); + + brelse(osb->osb_tl_bh); + iput(osb->osb_tl_inode); + } + + mlog_exit_void(); +} + +int ocfs2_truncate_log_init(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = NULL; + struct buffer_head *tl_bh = NULL; + + mlog_entry_void(); + + status = ocfs2_get_truncate_log_info(osb, + osb->slot_num, + &tl_inode, + &tl_bh); + if (status < 0) + mlog_errno(status); + + /* ocfs2_truncate_log_shutdown keys on the existence of + * osb->osb_tl_inode so we don't set any of the osb variables + * until we're sure all is well. */ + INIT_WORK(&osb->osb_truncate_log_wq, ocfs2_truncate_log_worker, osb); + osb->osb_tl_bh = tl_bh; + osb->osb_tl_inode = tl_inode; + + mlog_exit(status); + return status; +} + +/* This function will figure out whether the currently last extent + * block will be deleted, and if it will, what the new last extent + * block will be so we can update his h_next_leaf_blk field, as well + * as the dinodes i_last_eb_blk */ +static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb, + struct inode *inode, + struct ocfs2_dinode *fe, + u32 new_i_clusters, + struct buffer_head *old_last_eb, + struct buffer_head **new_last_eb) +{ + int i, status = 0; + u64 block = 0; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *bh = NULL; + + *new_last_eb = NULL; + + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); + status = -EIO; + goto bail; + } + + /* we have no tree, so of course, no last_eb. */ + if (!fe->id2.i_list.l_tree_depth) + goto bail; + + /* trunc to zero special case - this makes tree_depth = 0 + * regardless of what it is. */ + if (!new_i_clusters) + goto bail; + + eb = (struct ocfs2_extent_block *) old_last_eb->b_data; + el = &(eb->h_list); + BUG_ON(!el->l_next_free_rec); + + /* Make sure that this guy will actually be empty after we + * clear away the data. */ + if (le32_to_cpu(el->l_recs[0].e_cpos) < new_i_clusters) + goto bail; + + /* Ok, at this point, we know that last_eb will definitely + * change, so lets traverse the tree and find the second to + * last extent block. */ + el = &(fe->id2.i_list); + /* go down the tree, */ + do { + for(i = (le16_to_cpu(el->l_next_free_rec) - 1); i >= 0; i--) { + if (le32_to_cpu(el->l_recs[i].e_cpos) < + new_i_clusters) { + block = le64_to_cpu(el->l_recs[i].e_blkno); + break; + } + } + BUG_ON(i < 0); + + if (bh) { + brelse(bh); + bh = NULL; + } + + status = ocfs2_read_block(osb, block, &bh, OCFS2_BH_CACHED, + inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + eb = (struct ocfs2_extent_block *) bh->b_data; + el = &eb->h_list; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + } while (el->l_tree_depth); + + *new_last_eb = bh; + get_bh(*new_last_eb); + mlog(0, "returning block %"MLFu64"\n", le64_to_cpu(eb->h_blkno)); +bail: + if (bh) + brelse(bh); + + return status; +} + +static int ocfs2_do_truncate(struct ocfs2_super *osb, + unsigned int clusters_to_del, + struct inode *inode, + struct buffer_head *fe_bh, + struct buffer_head *old_last_eb_bh, + struct ocfs2_journal_handle *handle, + struct ocfs2_truncate_context *tc) +{ + int status, i, depth; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_block *last_eb = NULL; + struct ocfs2_extent_list *el; + struct buffer_head *eb_bh = NULL; + struct buffer_head *last_eb_bh = NULL; + u64 next_eb = 0; + u64 delete_blk = 0; + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + status = ocfs2_find_new_last_ext_blk(osb, + inode, + fe, + le32_to_cpu(fe->i_clusters) - + clusters_to_del, + old_last_eb_bh, + &last_eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + if (last_eb_bh) + last_eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + el = &(fe->id2.i_list); + + spin_lock(&OCFS2_I(inode)->ip_lock); + OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters) - + clusters_to_del; + spin_unlock(&OCFS2_I(inode)->ip_lock); + le32_add_cpu(&fe->i_clusters, -clusters_to_del); + fe->i_mtime = cpu_to_le64(CURRENT_TIME.tv_sec); + fe->i_mtime_nsec = cpu_to_le32(CURRENT_TIME.tv_nsec); + + i = le16_to_cpu(el->l_next_free_rec) - 1; + + BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del); + le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del); + /* tree depth zero, we can just delete the clusters, otherwise + * we need to record the offset of the next level extent block + * as we may overwrite it. */ + if (!el->l_tree_depth) + delete_blk = le64_to_cpu(el->l_recs[i].e_blkno) + + ocfs2_clusters_to_blocks(osb->sb, + le32_to_cpu(el->l_recs[i].e_clusters)); + else + next_eb = le64_to_cpu(el->l_recs[i].e_blkno); + + if (!el->l_recs[i].e_clusters) { + /* if we deleted the whole extent record, then clear + * out the other fields and update the extent + * list. For depth > 0 trees, we've already recorded + * the extent block in 'next_eb' */ + el->l_recs[i].e_cpos = 0; + el->l_recs[i].e_blkno = 0; + BUG_ON(!el->l_next_free_rec); + le16_add_cpu(&el->l_next_free_rec, -1); + } + + depth = le16_to_cpu(el->l_tree_depth); + if (!fe->i_clusters) { + /* trunc to zero is a special case. */ + el->l_tree_depth = 0; + fe->i_last_eb_blk = 0; + } else if (last_eb) + fe->i_last_eb_blk = last_eb->h_blkno; + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (last_eb) { + /* If there will be a new last extent block, then by + * definition, there cannot be any leaves to the right of + * him. */ + status = ocfs2_journal_access(handle, inode, last_eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + last_eb->h_next_leaf_blk = 0; + status = ocfs2_journal_dirty(handle, last_eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* if our tree depth > 0, update all the tree blocks below us. */ + while (depth) { + mlog(0, "traveling tree (depth = %d, next_eb = %"MLFu64")\n", + depth, next_eb); + status = ocfs2_read_block(osb, next_eb, &eb_bh, + OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + eb = (struct ocfs2_extent_block *)eb_bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + el = &(eb->h_list); + + status = ocfs2_journal_access(handle, inode, eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0); + BUG_ON(depth != (le16_to_cpu(el->l_tree_depth) + 1)); + + i = le16_to_cpu(el->l_next_free_rec) - 1; + + mlog(0, "extent block %"MLFu64", before: record %d: " + "(%u, %u, %"MLFu64"), next = %u\n", + le64_to_cpu(eb->h_blkno), i, + le32_to_cpu(el->l_recs[i].e_cpos), + le32_to_cpu(el->l_recs[i].e_clusters), + le64_to_cpu(el->l_recs[i].e_blkno), + le16_to_cpu(el->l_next_free_rec)); + + BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del); + le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del); + + next_eb = le64_to_cpu(el->l_recs[i].e_blkno); + /* bottom-most block requires us to delete data.*/ + if (!el->l_tree_depth) + delete_blk = le64_to_cpu(el->l_recs[i].e_blkno) + + ocfs2_clusters_to_blocks(osb->sb, + le32_to_cpu(el->l_recs[i].e_clusters)); + if (!el->l_recs[i].e_clusters) { + el->l_recs[i].e_cpos = 0; + el->l_recs[i].e_blkno = 0; + BUG_ON(!el->l_next_free_rec); + le16_add_cpu(&el->l_next_free_rec, -1); + } + mlog(0, "extent block %"MLFu64", after: record %d: " + "(%u, %u, %"MLFu64"), next = %u\n", + le64_to_cpu(eb->h_blkno), i, + le32_to_cpu(el->l_recs[i].e_cpos), + le32_to_cpu(el->l_recs[i].e_clusters), + le64_to_cpu(el->l_recs[i].e_blkno), + le16_to_cpu(el->l_next_free_rec)); + + status = ocfs2_journal_dirty(handle, eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (!el->l_next_free_rec) { + mlog(0, "deleting this extent block.\n"); + + ocfs2_remove_from_cache(inode, eb_bh); + + BUG_ON(eb->h_suballoc_slot); + BUG_ON(el->l_recs[0].e_clusters); + BUG_ON(el->l_recs[0].e_cpos); + BUG_ON(el->l_recs[0].e_blkno); + status = ocfs2_free_extent_block(handle, + tc->tc_ext_alloc_inode, + tc->tc_ext_alloc_bh, + eb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + brelse(eb_bh); + eb_bh = NULL; + depth--; + } + + BUG_ON(!delete_blk); + status = ocfs2_truncate_log_append(osb, handle, delete_blk, + clusters_to_del); + if (status < 0) { + mlog_errno(status); + goto bail; + } + status = 0; +bail: + if (!status) + ocfs2_extent_map_trunc(inode, le32_to_cpu(fe->i_clusters)); + else + ocfs2_extent_map_drop(inode, 0); + mlog_exit(status); + return status; +} + +/* + * It is expected, that by the time you call this function, + * inode->i_size and fe->i_size have been adjusted. + * + * WARNING: This will kfree the truncate context + */ +int ocfs2_commit_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_truncate_context *tc) +{ + int status, i, credits, tl_sem = 0; + u32 clusters_to_del, target_i_clusters; + u64 last_eb = 0; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *last_eb_bh; + struct ocfs2_journal_handle *handle = NULL; + struct inode *tl_inode = osb->osb_tl_inode; + + mlog_entry_void(); + + down_write(&OCFS2_I(inode)->ip_alloc_sem); + + target_i_clusters = ocfs2_clusters_for_bytes(osb->sb, + i_size_read(inode)); + + last_eb_bh = tc->tc_last_eb_bh; + tc->tc_last_eb_bh = NULL; + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + if (fe->id2.i_list.l_tree_depth) { + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + el = &eb->h_list; + } else + el = &fe->id2.i_list; + last_eb = le64_to_cpu(fe->i_last_eb_blk); +start: + mlog(0, "ocfs2_commit_truncate: fe->i_clusters = %u, " + "last_eb = %"MLFu64", fe->i_last_eb_blk = %"MLFu64", " + "fe->id2.i_list.l_tree_depth = %u last_eb_bh = %p\n", + le32_to_cpu(fe->i_clusters), last_eb, + le64_to_cpu(fe->i_last_eb_blk), + le16_to_cpu(fe->id2.i_list.l_tree_depth), last_eb_bh); + + if (last_eb != le64_to_cpu(fe->i_last_eb_blk)) { + mlog(0, "last_eb changed!\n"); + BUG_ON(!fe->id2.i_list.l_tree_depth); + last_eb = le64_to_cpu(fe->i_last_eb_blk); + /* i_last_eb_blk may have changed, read it if + * necessary. We don't have to worry about the + * truncate to zero case here (where there becomes no + * last_eb) because we never loop back after our work + * is done. */ + if (last_eb_bh) { + brelse(last_eb_bh); + last_eb_bh = NULL; + } + + status = ocfs2_read_block(osb, last_eb, + &last_eb_bh, OCFS2_BH_CACHED, + inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + status = -EIO; + goto bail; + } + el = &(eb->h_list); + } + + /* by now, el will point to the extent list on the bottom most + * portion of this tree. */ + i = le16_to_cpu(el->l_next_free_rec) - 1; + if (le32_to_cpu(el->l_recs[i].e_cpos) >= target_i_clusters) + clusters_to_del = le32_to_cpu(el->l_recs[i].e_clusters); + else + clusters_to_del = (le32_to_cpu(el->l_recs[i].e_clusters) + + le32_to_cpu(el->l_recs[i].e_cpos)) - + target_i_clusters; + + mlog(0, "clusters_to_del = %u in this pass\n", clusters_to_del); + + down(&tl_inode->i_sem); + tl_sem = 1; + /* ocfs2_truncate_log_needs_flush guarantees us at least one + * record is free for use. If there isn't any, we flush to get + * an empty truncate log. */ + if (ocfs2_truncate_log_needs_flush(osb)) { + status = __ocfs2_flush_truncate_log(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + credits = ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del, + fe, el); + handle = ocfs2_start_trans(osb, NULL, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + inode->i_ctime = inode->i_mtime = CURRENT_TIME; + status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); + if (status < 0) + mlog_errno(status); + + status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh, + last_eb_bh, handle, tc); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + up(&tl_inode->i_sem); + tl_sem = 0; + + ocfs2_commit_trans(handle); + handle = NULL; + + BUG_ON(le32_to_cpu(fe->i_clusters) < target_i_clusters); + if (le32_to_cpu(fe->i_clusters) > target_i_clusters) + goto start; +bail: + up_write(&OCFS2_I(inode)->ip_alloc_sem); + + ocfs2_schedule_truncate_log_flush(osb, 1); + + if (tl_sem) + up(&tl_inode->i_sem); + + if (handle) + ocfs2_commit_trans(handle); + + if (last_eb_bh) + brelse(last_eb_bh); + + /* This will drop the ext_alloc cluster lock for us */ + ocfs2_free_truncate_context(tc); + + mlog_exit(status); + return status; +} + + +/* + * Expects the inode to already be locked. This will figure out which + * inodes need to be locked and will put them on the returned truncate + * context. + */ +int ocfs2_prepare_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_truncate_context **tc) +{ + int status, metadata_delete; + unsigned int new_i_clusters; + struct ocfs2_dinode *fe; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *last_eb_bh = NULL; + struct inode *ext_alloc_inode = NULL; + struct buffer_head *ext_alloc_bh = NULL; + + mlog_entry_void(); + + *tc = NULL; + + new_i_clusters = ocfs2_clusters_for_bytes(osb->sb, + i_size_read(inode)); + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + mlog(0, "fe->i_clusters = %u, new_i_clusters = %u, fe->i_size =" + "%"MLFu64"\n", fe->i_clusters, new_i_clusters, fe->i_size); + + if (le32_to_cpu(fe->i_clusters) <= new_i_clusters) { + ocfs2_error(inode->i_sb, "Dinode %"MLFu64" has cluster count " + "%u and size %"MLFu64" whereas struct inode has " + "cluster count %u and size %llu which caused an " + "invalid truncate to %u clusters.", + le64_to_cpu(fe->i_blkno), + le32_to_cpu(fe->i_clusters), + le64_to_cpu(fe->i_size), + OCFS2_I(inode)->ip_clusters, i_size_read(inode), + new_i_clusters); + mlog_meta_lvb(ML_ERROR, &OCFS2_I(inode)->ip_meta_lockres); + status = -EIO; + goto bail; + } + + *tc = kcalloc(1, sizeof(struct ocfs2_truncate_context), GFP_KERNEL); + if (!(*tc)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + metadata_delete = 0; + if (fe->id2.i_list.l_tree_depth) { + /* If we have a tree, then the truncate may result in + * metadata deletes. Figure this out from the + * rightmost leaf block.*/ + status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk), + &last_eb_bh, OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + + brelse(last_eb_bh); + status = -EIO; + goto bail; + } + el = &(eb->h_list); + if (le32_to_cpu(el->l_recs[0].e_cpos) >= new_i_clusters) + metadata_delete = 1; + } + + (*tc)->tc_last_eb_bh = last_eb_bh; + + if (metadata_delete) { + mlog(0, "Will have to delete metadata for this trunc. " + "locking allocator.\n"); + ext_alloc_inode = ocfs2_get_system_file_inode(osb, EXTENT_ALLOC_SYSTEM_INODE, 0); + if (!ext_alloc_inode) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + down(&ext_alloc_inode->i_sem); + (*tc)->tc_ext_alloc_inode = ext_alloc_inode; + + status = ocfs2_meta_lock(ext_alloc_inode, + NULL, + &ext_alloc_bh, + 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + (*tc)->tc_ext_alloc_bh = ext_alloc_bh; + (*tc)->tc_ext_alloc_locked = 1; + } + + status = 0; +bail: + if (status < 0) { + if (*tc) + ocfs2_free_truncate_context(*tc); + *tc = NULL; + } + mlog_exit_void(); + return status; +} + +static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc) +{ + if (tc->tc_ext_alloc_inode) { + if (tc->tc_ext_alloc_locked) + ocfs2_meta_unlock(tc->tc_ext_alloc_inode, 1); + + up(&tc->tc_ext_alloc_inode->i_sem); + iput(tc->tc_ext_alloc_inode); + } + + if (tc->tc_ext_alloc_bh) + brelse(tc->tc_ext_alloc_bh); + + if (tc->tc_last_eb_bh) + brelse(tc->tc_last_eb_bh); + + kfree(tc); +} diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h new file mode 100644 index 0000000..12ba897 --- /dev/null +++ b/fs/ocfs2/alloc.h @@ -0,0 +1,82 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * alloc.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_ALLOC_H +#define OCFS2_ALLOC_H + +struct ocfs2_alloc_context; +int ocfs2_insert_extent(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 blkno, + u32 new_clusters, + struct ocfs2_alloc_context *meta_ac); +int ocfs2_num_free_extents(struct ocfs2_super *osb, + struct inode *inode, + struct ocfs2_dinode *fe); +/* how many new metadata chunks would an allocation need at maximum? */ +static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe) +{ + /* + * Rather than do all the work of determining how much we need + * (involves a ton of reads and locks), just ask for the + * maximal limit. That's a tree depth shift. So, one block for + * level of the tree (current l_tree_depth), one block for the + * new tree_depth==0 extent_block, and one block at the new + * top-of-the tree. + */ + return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2; +} + +int ocfs2_truncate_log_init(struct ocfs2_super *osb); +void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb); +void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, + int cancel); +int ocfs2_flush_truncate_log(struct ocfs2_super *osb); +int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, + int slot_num, + struct ocfs2_dinode **tl_copy); +int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, + struct ocfs2_dinode *tl_copy); + +struct ocfs2_truncate_context { + struct inode *tc_ext_alloc_inode; + struct buffer_head *tc_ext_alloc_bh; + int tc_ext_alloc_locked; /* is it cluster locked? */ + /* these get destroyed once it's passed to ocfs2_commit_truncate. */ + struct buffer_head *tc_last_eb_bh; +}; + +int ocfs2_prepare_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_truncate_context **tc); +int ocfs2_commit_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_truncate_context *tc); + +#endif /* OCFS2_ALLOC_H */ diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c new file mode 100644 index 0000000..8f4467a --- /dev/null +++ b/fs/ocfs2/aops.c @@ -0,0 +1,643 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <asm/byteorder.h> + +#define MLOG_MASK_PREFIX ML_FILE_IO +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "aops.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "super.h" +#include "symlink.h" + +#include "buffer_head_io.h" + +static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int err = -EIO; + int status; + struct ocfs2_dinode *fe = NULL; + struct buffer_head *bh = NULL; + struct buffer_head *buffer_cache_bh = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + void *kaddr; + + mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, + (unsigned long long)iblock, bh_result, create); + + BUG_ON(ocfs2_inode_is_fast_symlink(inode)); + + if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { + mlog(ML_ERROR, "block offset > PATH_MAX: %llu", + (unsigned long long)iblock); + goto bail; + } + + status = ocfs2_read_block(OCFS2_SB(inode->i_sb), + OCFS2_I(inode)->ip_blkno, + &bh, OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + fe = (struct ocfs2_dinode *) bh->b_data; + + if (!OCFS2_IS_VALID_DINODE(fe)) { + mlog(ML_ERROR, "Invalid dinode #%"MLFu64": signature = %.*s\n", + fe->i_blkno, 7, fe->i_signature); + goto bail; + } + + if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, + le32_to_cpu(fe->i_clusters))) { + mlog(ML_ERROR, "block offset is outside the allocated size: " + "%llu\n", (unsigned long long)iblock); + goto bail; + } + + /* We don't use the page cache to create symlink data, so if + * need be, copy it over from the buffer cache. */ + if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { + u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + + iblock; + buffer_cache_bh = sb_getblk(osb->sb, blkno); + if (!buffer_cache_bh) { + mlog(ML_ERROR, "couldn't getblock for symlink!\n"); + goto bail; + } + + /* we haven't locked out transactions, so a commit + * could've happened. Since we've got a reference on + * the bh, even if it commits while we're doing the + * copy, the data is still good. */ + if (buffer_jbd(buffer_cache_bh) + && ocfs2_inode_is_new(inode)) { + kaddr = kmap_atomic(bh_result->b_page, KM_USER0); + if (!kaddr) { + mlog(ML_ERROR, "couldn't kmap!\n"); + goto bail; + } + memcpy(kaddr + (bh_result->b_size * iblock), + buffer_cache_bh->b_data, + bh_result->b_size); + kunmap_atomic(kaddr, KM_USER0); + set_buffer_uptodate(bh_result); + } + brelse(buffer_cache_bh); + } + + map_bh(bh_result, inode->i_sb, + le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); + + err = 0; + +bail: + if (bh) + brelse(bh); + + mlog_exit(err); + return err; +} + +static int ocfs2_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int err = 0; + u64 p_blkno, past_eof; + + mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, + (unsigned long long)iblock, bh_result, create); + + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) + mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", + inode, inode->i_ino); + + if (S_ISLNK(inode->i_mode)) { + /* this always does I/O for some reason. */ + err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); + goto bail; + } + + /* this can happen if another node truncs after our extend! */ + spin_lock(&OCFS2_I(inode)->ip_lock); + if (iblock >= ocfs2_clusters_to_blocks(inode->i_sb, + OCFS2_I(inode)->ip_clusters)) + err = -EIO; + spin_unlock(&OCFS2_I(inode)->ip_lock); + if (err) + goto bail; + + err = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno, + NULL); + if (err) { + mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " + "%"MLFu64", NULL)\n", err, inode, + (unsigned long long)iblock, p_blkno); + goto bail; + } + + map_bh(bh_result, inode->i_sb, p_blkno); + + if (bh_result->b_blocknr == 0) { + err = -EIO; + mlog(ML_ERROR, "iblock = %llu p_blkno = %"MLFu64" " + "blkno=(%"MLFu64")\n", (unsigned long long)iblock, + p_blkno, OCFS2_I(inode)->ip_blkno); + } + + past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); + mlog(0, "Inode %lu, past_eof = %"MLFu64"\n", inode->i_ino, past_eof); + + if (create && (iblock >= past_eof)) + set_buffer_new(bh_result); + +bail: + if (err < 0) + err = -EIO; + + mlog_exit(err); + return err; +} + +static int ocfs2_readpage(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; + int ret, unlock = 1; + + mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); + + ret = ocfs2_meta_lock_with_page(inode, NULL, NULL, 0, page); + if (ret != 0) { + if (ret == AOP_TRUNCATED_PAGE) + unlock = 0; + mlog_errno(ret); + goto out; + } + + down_read(&OCFS2_I(inode)->ip_alloc_sem); + + /* + * i_size might have just been updated as we grabed the meta lock. We + * might now be discovering a truncate that hit on another node. + * block_read_full_page->get_block freaks out if it is asked to read + * beyond the end of a file, so we check here. Callers + * (generic_file_read, fault->nopage) are clever enough to check i_size + * and notice that the page they just read isn't needed. + * + * XXX sys_readahead() seems to get that wrong? + */ + if (start >= i_size_read(inode)) { + char *addr = kmap(page); + memset(addr, 0, PAGE_SIZE); + flush_dcache_page(page); + kunmap(page); + SetPageUptodate(page); + ret = 0; + goto out_alloc; + } + + ret = ocfs2_data_lock_with_page(inode, 0, page); + if (ret != 0) { + if (ret == AOP_TRUNCATED_PAGE) + unlock = 0; + mlog_errno(ret); + goto out_alloc; + } + + ret = block_read_full_page(page, ocfs2_get_block); + unlock = 0; + + ocfs2_data_unlock(inode, 0); +out_alloc: + up_read(&OCFS2_I(inode)->ip_alloc_sem); + ocfs2_meta_unlock(inode, 0); +out: + if (unlock) + unlock_page(page); + mlog_exit(ret); + return ret; +} + +/* Note: Because we don't support holes, our allocation has + * already happened (allocation writes zeros to the file data) + * so we don't have to worry about ordered writes in + * ocfs2_writepage. + * + * ->writepage is called during the process of invalidating the page cache + * during blocked lock processing. It can't block on any cluster locks + * to during block mapping. It's relying on the fact that the block + * mapping can't have disappeared under the dirty pages that it is + * being asked to write back. + */ +static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) +{ + int ret; + + mlog_entry("(0x%p)\n", page); + + ret = block_write_full_page(page, ocfs2_get_block, wbc); + + mlog_exit(ret); + + return ret; +} + +/* + * ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called + * from loopback. It must be able to perform its own locking around + * ocfs2_get_block(). + */ +int ocfs2_prepare_write(struct file *file, struct page *page, + unsigned from, unsigned to) +{ + struct inode *inode = page->mapping->host; + int ret; + + mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to); + + ret = ocfs2_meta_lock_with_page(inode, NULL, NULL, 0, page); + if (ret != 0) { + mlog_errno(ret); + goto out; + } + + down_read(&OCFS2_I(inode)->ip_alloc_sem); + + ret = block_prepare_write(page, from, to, ocfs2_get_block); + + up_read(&OCFS2_I(inode)->ip_alloc_sem); + + ocfs2_meta_unlock(inode, 0); +out: + mlog_exit(ret); + return ret; +} + +/* Taken from ext3. We don't necessarily need the full blown + * functionality yet, but IMHO it's better to cut and paste the whole + * thing so we can avoid introducing our own bugs (and easily pick up + * their fixes when they happen) --Mark */ +static int walk_page_buffers( handle_t *handle, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)( handle_t *handle, + struct buffer_head *bh)) +{ + struct buffer_head *bh; + unsigned block_start, block_end; + unsigned blocksize = head->b_size; + int err, ret = 0; + struct buffer_head *next; + + for ( bh = head, block_start = 0; + ret == 0 && (bh != head || !block_start); + block_start = block_end, bh = next) + { + next = bh->b_this_page; + block_end = block_start + blocksize; + if (block_end <= from || block_start >= to) { + if (partial && !buffer_uptodate(bh)) + *partial = 1; + continue; + } + err = (*fn)(handle, bh); + if (!ret) + ret = err; + } + return ret; +} + +struct ocfs2_journal_handle *ocfs2_start_walk_page_trans(struct inode *inode, + struct page *page, + unsigned from, + unsigned to) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_journal_handle *handle = NULL; + int ret = 0; + + handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); + if (!handle) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + if (ocfs2_should_order_data(inode)) { + ret = walk_page_buffers(handle->k_handle, + page_buffers(page), + from, to, NULL, + ocfs2_journal_dirty_data); + if (ret < 0) + mlog_errno(ret); + } +out: + if (ret) { + if (handle) + ocfs2_commit_trans(handle); + handle = ERR_PTR(ret); + } + return handle; +} + +static int ocfs2_commit_write(struct file *file, struct page *page, + unsigned from, unsigned to) +{ + int ret, extending = 0, locklevel = 0; + loff_t new_i_size; + struct buffer_head *di_bh = NULL; + struct inode *inode = page->mapping->host; + struct ocfs2_journal_handle *handle = NULL; + + mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to); + + /* NOTE: ocfs2_file_aio_write has ensured that it's safe for + * us to sample inode->i_size here without the metadata lock: + * + * 1) We're currently holding the inode alloc lock, so no + * nodes can change it underneath us. + * + * 2) We've had to take the metadata lock at least once + * already to check for extending writes, hence insuring + * that our current copy is also up to date. + */ + new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; + if (new_i_size > i_size_read(inode)) { + extending = 1; + locklevel = 1; + } + + ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, locklevel, page); + if (ret != 0) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_data_lock_with_page(inode, 1, page); + if (ret != 0) { + mlog_errno(ret); + goto out_unlock_meta; + } + + if (extending) { + handle = ocfs2_start_walk_page_trans(inode, page, from, to); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + handle = NULL; + goto out_unlock_data; + } + + /* Mark our buffer early. We'd rather catch this error up here + * as opposed to after a successful commit_write which would + * require us to set back inode->i_size. */ + ret = ocfs2_journal_access(handle, inode, di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + mlog_errno(ret); + goto out_commit; + } + } + + /* might update i_size */ + ret = generic_commit_write(file, page, from, to); + if (ret < 0) { + mlog_errno(ret); + goto out_commit; + } + + if (extending) { + loff_t size = (u64) i_size_read(inode); + struct ocfs2_dinode *di = + (struct ocfs2_dinode *)di_bh->b_data; + + /* ocfs2_mark_inode_dirty is too heavy to use here. */ + inode->i_blocks = ocfs2_align_bytes_to_sectors(size); + inode->i_ctime = inode->i_mtime = CURRENT_TIME; + + di->i_size = cpu_to_le64(size); + di->i_ctime = di->i_mtime = + cpu_to_le64(inode->i_mtime.tv_sec); + di->i_ctime_nsec = di->i_mtime_nsec = + cpu_to_le32(inode->i_mtime.tv_nsec); + + ret = ocfs2_journal_dirty(handle, di_bh); + if (ret < 0) { + mlog_errno(ret); + goto out_commit; + } + } + + BUG_ON(extending && (i_size_read(inode) != new_i_size)); + +out_commit: + if (handle) + ocfs2_commit_trans(handle); +out_unlock_data: + ocfs2_data_unlock(inode, 1); +out_unlock_meta: + ocfs2_meta_unlock(inode, locklevel); +out: + if (di_bh) + brelse(di_bh); + + mlog_exit(ret); + return ret; +} + +static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) +{ + sector_t status; + u64 p_blkno = 0; + int err = 0; + struct inode *inode = mapping->host; + + mlog_entry("(block = %llu)\n", (unsigned long long)block); + + /* We don't need to lock journal system files, since they aren't + * accessed concurrently from multiple nodes. + */ + if (!INODE_JOURNAL(inode)) { + err = ocfs2_meta_lock(inode, NULL, NULL, 0); + if (err) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + down_read(&OCFS2_I(inode)->ip_alloc_sem); + } + + err = ocfs2_extent_map_get_blocks(inode, block, 1, &p_blkno, + NULL); + + if (!INODE_JOURNAL(inode)) { + up_read(&OCFS2_I(inode)->ip_alloc_sem); + ocfs2_meta_unlock(inode, 0); + } + + if (err) { + mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", + (unsigned long long)block); + mlog_errno(err); + goto bail; + } + + +bail: + status = err ? 0 : p_blkno; + + mlog_exit((int)status); + + return status; +} + +/* + * TODO: Make this into a generic get_blocks function. + * + * From do_direct_io in direct-io.c: + * "So what we do is to permit the ->get_blocks function to populate + * bh.b_size with the size of IO which is permitted at this offset and + * this i_blkbits." + * + * This function is called directly from get_more_blocks in direct-io.c. + * + * called like this: dio->get_blocks(dio->inode, fs_startblk, + * fs_count, map_bh, dio->rw == WRITE); + */ +static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, + unsigned long max_blocks, + struct buffer_head *bh_result, int create) +{ + int ret; + u64 vbo_max; /* file offset, max_blocks from iblock */ + u64 p_blkno; + int contig_blocks; + unsigned char blocksize_bits; + + if (!inode || !bh_result) { + mlog(ML_ERROR, "inode or bh_result is null\n"); + return -EIO; + } + + blocksize_bits = inode->i_sb->s_blocksize_bits; + + /* This function won't even be called if the request isn't all + * nicely aligned and of the right size, so there's no need + * for us to check any of that. */ + + vbo_max = ((u64)iblock + max_blocks) << blocksize_bits; + + spin_lock(&OCFS2_I(inode)->ip_lock); + if ((iblock + max_blocks) > + ocfs2_clusters_to_blocks(inode->i_sb, + OCFS2_I(inode)->ip_clusters)) { + spin_unlock(&OCFS2_I(inode)->ip_lock); + ret = -EIO; + goto bail; + } + spin_unlock(&OCFS2_I(inode)->ip_lock); + + /* This figures out the size of the next contiguous block, and + * our logical offset */ + ret = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno, + &contig_blocks); + if (ret) { + mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", + (unsigned long long)iblock); + ret = -EIO; + goto bail; + } + + map_bh(bh_result, inode->i_sb, p_blkno); + + /* make sure we don't map more than max_blocks blocks here as + that's all the kernel will handle at this point. */ + if (max_blocks < contig_blocks) + contig_blocks = max_blocks; + bh_result->b_size = contig_blocks << blocksize_bits; +bail: + return ret; +} + +/* + * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're + * particularly interested in the aio/dio case. Like the core uses + * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from + * truncation on another. + */ +static void ocfs2_dio_end_io(struct kiocb *iocb, + loff_t offset, + ssize_t bytes, + void *private) +{ + struct inode *inode = iocb->ki_filp->f_dentry->d_inode; + + /* this io's submitter should not have unlocked this before we could */ + BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); + ocfs2_iocb_clear_rw_locked(iocb); + up_read(&inode->i_alloc_sem); + ocfs2_rw_unlock(inode, 0); +} + +static ssize_t ocfs2_direct_IO(int rw, + struct kiocb *iocb, + const struct iovec *iov, + loff_t offset, + unsigned long nr_segs) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_dentry->d_inode->i_mapping->host; + int ret; + + mlog_entry_void(); + ret = blockdev_direct_IO_no_locking(rw, iocb, inode, + inode->i_sb->s_bdev, iov, offset, + nr_segs, + ocfs2_direct_IO_get_blocks, + ocfs2_dio_end_io); + mlog_exit(ret); + return ret; +} + +struct address_space_operations ocfs2_aops = { + .readpage = ocfs2_readpage, + .writepage = ocfs2_writepage, + .prepare_write = ocfs2_prepare_write, + .commit_write = ocfs2_commit_write, + .bmap = ocfs2_bmap, + .sync_page = block_sync_page, + .direct_IO = ocfs2_direct_IO +}; diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h new file mode 100644 index 0000000..d40456d --- /dev/null +++ b/fs/ocfs2/aops.h @@ -0,0 +1,41 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2002, 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_AOPS_H +#define OCFS2_AOPS_H + +int ocfs2_prepare_write(struct file *file, struct page *page, + unsigned from, unsigned to); + +struct ocfs2_journal_handle *ocfs2_start_walk_page_trans(struct inode *inode, + struct page *page, + unsigned from, + unsigned to); + +/* all ocfs2_dio_end_io()'s fault */ +#define ocfs2_iocb_is_rw_locked(iocb) \ + test_bit(0, (unsigned long *)&iocb->private) +#define ocfs2_iocb_set_rw_locked(iocb) \ + set_bit(0, (unsigned long *)&iocb->private) +#define ocfs2_iocb_clear_rw_locked(iocb) \ + clear_bit(0, (unsigned long *)&iocb->private) + +#endif /* OCFS2_FILE_H */ diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c new file mode 100644 index 0000000..d424041 --- /dev/null +++ b/fs/ocfs2/buffer_head_io.c @@ -0,0 +1,232 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * io.c + * + * Buffer cache handling + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "inode.h" +#include "journal.h" +#include "uptodate.h" + +#include "buffer_head_io.h" + +int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh, + struct inode *inode) +{ + int ret = 0; + + mlog_entry("(bh->b_blocknr = %llu, inode=%p)\n", + (unsigned long long)bh->b_blocknr, inode); + + BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO); + BUG_ON(buffer_jbd(bh)); + + /* No need to check for a soft readonly file system here. non + * journalled writes are only ever done on system files which + * can get modified during recovery even if read-only. */ + if (ocfs2_is_hard_readonly(osb)) { + ret = -EROFS; + goto out; + } + + down(&OCFS2_I(inode)->ip_io_sem); + + lock_buffer(bh); + set_buffer_uptodate(bh); + + /* remove from dirty list before I/O. */ + clear_buffer_dirty(bh); + + get_bh(bh); /* for end_buffer_write_sync() */ + bh->b_end_io = end_buffer_write_sync; + submit_bh(WRITE, bh); + + wait_on_buffer(bh); + + if (buffer_uptodate(bh)) { + ocfs2_set_buffer_uptodate(inode, bh); + } else { + /* We don't need to remove the clustered uptodate + * information for this bh as it's not marked locally + * uptodate. */ + ret = -EIO; + brelse(bh); + } + + up(&OCFS2_I(inode)->ip_io_sem); +out: + mlog_exit(ret); + return ret; +} + +int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr, + struct buffer_head *bhs[], int flags, + struct inode *inode) +{ + int status = 0; + struct super_block *sb; + int i, ignore_cache = 0; + struct buffer_head *bh; + + mlog_entry("(block=(%"MLFu64"), nr=(%d), flags=%d, inode=%p)\n", + block, nr, flags, inode); + + if (osb == NULL || osb->sb == NULL || bhs == NULL) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + if (nr < 0) { + mlog(ML_ERROR, "asked to read %d blocks!\n", nr); + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + if (nr == 0) { + mlog(ML_BH_IO, "No buffers will be read!\n"); + status = 0; + goto bail; + } + + sb = osb->sb; + + if (flags & OCFS2_BH_CACHED && !inode) + flags &= ~OCFS2_BH_CACHED; + + if (inode) + down(&OCFS2_I(inode)->ip_io_sem); + for (i = 0 ; i < nr ; i++) { + if (bhs[i] == NULL) { + bhs[i] = sb_getblk(sb, block++); + if (bhs[i] == NULL) { + if (inode) + up(&OCFS2_I(inode)->ip_io_sem); + status = -EIO; + mlog_errno(status); + goto bail; + } + } + bh = bhs[i]; + ignore_cache = 0; + + if (flags & OCFS2_BH_CACHED && + !ocfs2_buffer_uptodate(inode, bh)) { + mlog(ML_UPTODATE, + "bh (%llu), inode %"MLFu64" not uptodate\n", + (unsigned long long)bh->b_blocknr, + OCFS2_I(inode)->ip_blkno); + ignore_cache = 1; + } + + /* XXX: Can we ever get this and *not* have the cached + * flag set? */ + if (buffer_jbd(bh)) { + if (!(flags & OCFS2_BH_CACHED) || ignore_cache) + mlog(ML_BH_IO, "trying to sync read a jbd " + "managed bh (blocknr = %llu)\n", + (unsigned long long)bh->b_blocknr); + continue; + } + + if (!(flags & OCFS2_BH_CACHED) || ignore_cache) { + if (buffer_dirty(bh)) { + /* This should probably be a BUG, or + * at least return an error. */ + mlog(ML_BH_IO, "asking me to sync read a dirty " + "buffer! (blocknr = %llu)\n", + (unsigned long long)bh->b_blocknr); + continue; + } + + lock_buffer(bh); + if (buffer_jbd(bh)) { +#ifdef CATCH_BH_JBD_RACES + mlog(ML_ERROR, "block %llu had the JBD bit set " + "while I was in lock_buffer!", + (unsigned long long)bh->b_blocknr); + BUG(); +#else + unlock_buffer(bh); + continue; +#endif + } + clear_buffer_uptodate(bh); + get_bh(bh); /* for end_buffer_read_sync() */ + bh->b_end_io = end_buffer_read_sync; + if (flags & OCFS2_BH_READAHEAD) + submit_bh(READA, bh); + else + submit_bh(READ, bh); + continue; + } + } + + status = 0; + + for (i = (nr - 1); i >= 0; i--) { + bh = bhs[i]; + + /* We know this can't have changed as we hold the + * inode sem. Avoid doing any work on the bh if the + * journal has it. */ + if (!buffer_jbd(bh)) + wait_on_buffer(bh); + + if (!buffer_uptodate(bh)) { + /* Status won't be cleared from here on out, + * so we can safely record this and loop back + * to cleanup the other buffers. Don't need to + * remove the clustered uptodate information + * for this bh as it's not marked locally + * uptodate. */ + status = -EIO; + brelse(bh); + bhs[i] = NULL; + continue; + } + + if (inode) + ocfs2_set_buffer_uptodate(inode, bh); + } + if (inode) + up(&OCFS2_I(inode)->ip_io_sem); + + mlog(ML_BH_IO, "block=(%"MLFu64"), nr=(%d), cached=%s\n", block, nr, + (!(flags & OCFS2_BH_CACHED) || ignore_cache) ? "no" : "yes"); + +bail: + + mlog_exit(status); + return status; +} diff --git a/fs/ocfs2/buffer_head_io.h b/fs/ocfs2/buffer_head_io.h new file mode 100644 index 0000000..6ecb909 --- /dev/null +++ b/fs/ocfs2/buffer_head_io.h @@ -0,0 +1,73 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2_buffer_head.h + * + * Buffer cache handling functions defined + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_BUFFER_HEAD_IO_H +#define OCFS2_BUFFER_HEAD_IO_H + +#include <linux/buffer_head.h> + +void ocfs2_end_buffer_io_sync(struct buffer_head *bh, + int uptodate); + +static inline int ocfs2_read_block(struct ocfs2_super *osb, + u64 off, + struct buffer_head **bh, + int flags, + struct inode *inode); + +int ocfs2_write_block(struct ocfs2_super *osb, + struct buffer_head *bh, + struct inode *inode); +int ocfs2_read_blocks(struct ocfs2_super *osb, + u64 block, + int nr, + struct buffer_head *bhs[], + int flags, + struct inode *inode); + + +#define OCFS2_BH_CACHED 1 +#define OCFS2_BH_READAHEAD 8 /* use this to pass READA down to submit_bh */ + +static inline int ocfs2_read_block(struct ocfs2_super * osb, u64 off, + struct buffer_head **bh, int flags, + struct inode *inode) +{ + int status = 0; + + if (bh == NULL) { + printk("ocfs2: bh == NULL\n"); + status = -EINVAL; + goto bail; + } + + status = ocfs2_read_blocks(osb, off, 1, bh, + flags, inode); + +bail: + return status; +} + +#endif /* OCFS2_BUFFER_HEAD_IO_H */ diff --git a/fs/ocfs2/cluster/Makefile b/fs/ocfs2/cluster/Makefile new file mode 100644 index 0000000..cdd162f --- /dev/null +++ b/fs/ocfs2/cluster/Makefile @@ -0,0 +1,4 @@ +obj-$(CONFIG_OCFS2_FS) += ocfs2_nodemanager.o + +ocfs2_nodemanager-objs := heartbeat.o masklog.o sys.o nodemanager.o \ + quorum.o tcp.o ver.o diff --git a/fs/ocfs2/cluster/endian.h b/fs/ocfs2/cluster/endian.h new file mode 100644 index 0000000..2df9082 --- /dev/null +++ b/fs/ocfs2/cluster/endian.h @@ -0,0 +1,30 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_CLUSTER_ENDIAN_H +#define OCFS2_CLUSTER_ENDIAN_H + +static inline void be32_add_cpu(__be32 *var, u32 val) +{ + *var = cpu_to_be32(be32_to_cpu(*var) + val); +} + +#endif /* OCFS2_CLUSTER_ENDIAN_H */ diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c new file mode 100644 index 0000000..7307ba5 --- /dev/null +++ b/fs/ocfs2/cluster/heartbeat.c @@ -0,0 +1,1797 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/delay.h> +#include <linux/file.h> +#include <linux/kthread.h> +#include <linux/configfs.h> +#include <linux/random.h> +#include <linux/crc32.h> +#include <linux/time.h> + +#include "heartbeat.h" +#include "tcp.h" +#include "nodemanager.h" +#include "quorum.h" + +#include "masklog.h" + + +/* + * The first heartbeat pass had one global thread that would serialize all hb + * callback calls. This global serializing sem should only be removed once + * we've made sure that all callees can deal with being called concurrently + * from multiple hb region threads. + */ +static DECLARE_RWSEM(o2hb_callback_sem); + +/* + * multiple hb threads are watching multiple regions. A node is live + * whenever any of the threads sees activity from the node in its region. + */ +static spinlock_t o2hb_live_lock = SPIN_LOCK_UNLOCKED; +static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; +static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; +static LIST_HEAD(o2hb_node_events); +static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); + +static LIST_HEAD(o2hb_all_regions); + +static struct o2hb_callback { + struct list_head list; +} o2hb_callbacks[O2HB_NUM_CB]; + +static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); + +#define O2HB_DEFAULT_BLOCK_BITS 9 + +unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; + +/* Only sets a new threshold if there are no active regions. + * + * No locking or otherwise interesting code is required for reading + * o2hb_dead_threshold as it can't change once regions are active and + * it's not interesting to anyone until then anyway. */ +static void o2hb_dead_threshold_set(unsigned int threshold) +{ + if (threshold > O2HB_MIN_DEAD_THRESHOLD) { + spin_lock(&o2hb_live_lock); + if (list_empty(&o2hb_all_regions)) + o2hb_dead_threshold = threshold; + spin_unlock(&o2hb_live_lock); + } +} + +struct o2hb_node_event { + struct list_head hn_item; + enum o2hb_callback_type hn_event_type; + struct o2nm_node *hn_node; + int hn_node_num; +}; + +struct o2hb_disk_slot { + struct o2hb_disk_heartbeat_block *ds_raw_block; + u8 ds_node_num; + u64 ds_last_time; + u64 ds_last_generation; + u16 ds_equal_samples; + u16 ds_changed_samples; + struct list_head ds_live_item; +}; + +/* each thread owns a region.. when we're asked to tear down the region + * we ask the thread to stop, who cleans up the region */ +struct o2hb_region { + struct config_item hr_item; + + struct list_head hr_all_item; + unsigned hr_unclean_stop:1; + + /* protected by the hr_callback_sem */ + struct task_struct *hr_task; + + unsigned int hr_blocks; + unsigned long long hr_start_block; + + unsigned int hr_block_bits; + unsigned int hr_block_bytes; + + unsigned int hr_slots_per_page; + unsigned int hr_num_pages; + + struct page **hr_slot_data; + struct block_device *hr_bdev; + struct o2hb_disk_slot *hr_slots; + + /* let the person setting up hb wait for it to return until it + * has reached a 'steady' state. This will be fixed when we have + * a more complete api that doesn't lead to this sort of fragility. */ + atomic_t hr_steady_iterations; + + char hr_dev_name[BDEVNAME_SIZE]; + + unsigned int hr_timeout_ms; + + /* randomized as the region goes up and down so that a node + * recognizes a node going up and down in one iteration */ + u64 hr_generation; + + struct work_struct hr_write_timeout_work; + unsigned long hr_last_timeout_start; + + /* Used during o2hb_check_slot to hold a copy of the block + * being checked because we temporarily have to zero out the + * crc field. */ + struct o2hb_disk_heartbeat_block *hr_tmp_block; +}; + +struct o2hb_bio_wait_ctxt { + atomic_t wc_num_reqs; + struct completion wc_io_complete; +}; + +static void o2hb_write_timeout(void *arg) +{ + struct o2hb_region *reg = arg; + + mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " + "milliseconds\n", reg->hr_dev_name, + jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); + o2quo_disk_timeout(); +} + +static void o2hb_arm_write_timeout(struct o2hb_region *reg) +{ + mlog(0, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS); + + cancel_delayed_work(®->hr_write_timeout_work); + reg->hr_last_timeout_start = jiffies; + schedule_delayed_work(®->hr_write_timeout_work, + msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); +} + +static void o2hb_disarm_write_timeout(struct o2hb_region *reg) +{ + cancel_delayed_work(®->hr_write_timeout_work); + flush_scheduled_work(); +} + +static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc, + unsigned int num_ios) +{ + atomic_set(&wc->wc_num_reqs, num_ios); + init_completion(&wc->wc_io_complete); +} + +/* Used in error paths too */ +static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, + unsigned int num) +{ + /* sadly atomic_sub_and_test() isn't available on all platforms. The + * good news is that the fast path only completes one at a time */ + while(num--) { + if (atomic_dec_and_test(&wc->wc_num_reqs)) { + BUG_ON(num > 0); + complete(&wc->wc_io_complete); + } + } +} + +static void o2hb_wait_on_io(struct o2hb_region *reg, + struct o2hb_bio_wait_ctxt *wc) +{ + struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping; + + blk_run_address_space(mapping); + + wait_for_completion(&wc->wc_io_complete); +} + +static int o2hb_bio_end_io(struct bio *bio, + unsigned int bytes_done, + int error) +{ + struct o2hb_bio_wait_ctxt *wc = bio->bi_private; + + if (error) + mlog(ML_ERROR, "IO Error %d\n", error); + + if (bio->bi_size) + return 1; + + o2hb_bio_wait_dec(wc, 1); + return 0; +} + +/* Setup a Bio to cover I/O against num_slots slots starting at + * start_slot. */ +static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, + struct o2hb_bio_wait_ctxt *wc, + unsigned int start_slot, + unsigned int num_slots) +{ + int i, nr_vecs, len, first_page, last_page; + unsigned int vec_len, vec_start; + unsigned int bits = reg->hr_block_bits; + unsigned int spp = reg->hr_slots_per_page; + struct bio *bio; + struct page *page; + + nr_vecs = (num_slots + spp - 1) / spp; + + /* Testing has shown this allocation to take long enough under + * GFP_KERNEL that the local node can get fenced. It would be + * nicest if we could pre-allocate these bios and avoid this + * all together. */ + bio = bio_alloc(GFP_ATOMIC, nr_vecs); + if (!bio) { + mlog(ML_ERROR, "Could not alloc slots BIO!\n"); + bio = ERR_PTR(-ENOMEM); + goto bail; + } + + /* Must put everything in 512 byte sectors for the bio... */ + bio->bi_sector = (reg->hr_start_block + start_slot) << (bits - 9); + bio->bi_bdev = reg->hr_bdev; + bio->bi_private = wc; + bio->bi_end_io = o2hb_bio_end_io; + + first_page = start_slot / spp; + last_page = first_page + nr_vecs; + vec_start = (start_slot << bits) % PAGE_CACHE_SIZE; + for(i = first_page; i < last_page; i++) { + page = reg->hr_slot_data[i]; + + vec_len = PAGE_CACHE_SIZE; + /* last page might be short */ + if (((i + 1) * spp) > (start_slot + num_slots)) + vec_len = ((num_slots + start_slot) % spp) << bits; + vec_len -= vec_start; + + mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", + i, vec_len, vec_start); + + len = bio_add_page(bio, page, vec_len, vec_start); + if (len != vec_len) { + bio_put(bio); + bio = ERR_PTR(-EIO); + + mlog(ML_ERROR, "Error adding page to bio i = %d, " + "vec_len = %u, len = %d\n, start = %u\n", + i, vec_len, len, vec_start); + goto bail; + } + + vec_start = 0; + } + +bail: + return bio; +} + +/* + * Compute the maximum number of sectors the bdev can handle in one bio, + * as a power of two. + * + * Stolen from oracleasm, thanks Joel! + */ +static int compute_max_sectors(struct block_device *bdev) +{ + int max_pages, max_sectors, pow_two_sectors; + + struct request_queue *q; + + q = bdev_get_queue(bdev); + max_pages = q->max_sectors >> (PAGE_SHIFT - 9); + if (max_pages > BIO_MAX_PAGES) + max_pages = BIO_MAX_PAGES; + if (max_pages > q->max_phys_segments) + max_pages = q->max_phys_segments; + if (max_pages > q->max_hw_segments) + max_pages = q->max_hw_segments; + max_pages--; /* Handle I/Os that straddle a page */ + + max_sectors = max_pages << (PAGE_SHIFT - 9); + + /* Why is fls() 1-based???? */ + pow_two_sectors = 1 << (fls(max_sectors) - 1); + + return pow_two_sectors; +} + +static inline void o2hb_compute_request_limits(struct o2hb_region *reg, + unsigned int num_slots, + unsigned int *num_bios, + unsigned int *slots_per_bio) +{ + unsigned int max_sectors, io_sectors; + + max_sectors = compute_max_sectors(reg->hr_bdev); + + io_sectors = num_slots << (reg->hr_block_bits - 9); + + *num_bios = (io_sectors + max_sectors - 1) / max_sectors; + *slots_per_bio = max_sectors >> (reg->hr_block_bits - 9); + + mlog(ML_HB_BIO, "My io size is %u sectors for %u slots. This " + "device can handle %u sectors of I/O\n", io_sectors, num_slots, + max_sectors); + mlog(ML_HB_BIO, "Will need %u bios holding %u slots each\n", + *num_bios, *slots_per_bio); +} + +static int o2hb_read_slots(struct o2hb_region *reg, + unsigned int max_slots) +{ + unsigned int num_bios, slots_per_bio, start_slot, num_slots; + int i, status; + struct o2hb_bio_wait_ctxt wc; + struct bio **bios; + struct bio *bio; + + o2hb_compute_request_limits(reg, max_slots, &num_bios, &slots_per_bio); + + bios = kcalloc(num_bios, sizeof(struct bio *), GFP_KERNEL); + if (!bios) { + status = -ENOMEM; + mlog_errno(status); + return status; + } + + o2hb_bio_wait_init(&wc, num_bios); + + num_slots = slots_per_bio; + for(i = 0; i < num_bios; i++) { + start_slot = i * slots_per_bio; + + /* adjust num_slots at last bio */ + if (max_slots < (start_slot + num_slots)) + num_slots = max_slots - start_slot; + + bio = o2hb_setup_one_bio(reg, &wc, start_slot, num_slots); + if (IS_ERR(bio)) { + o2hb_bio_wait_dec(&wc, num_bios - i); + + status = PTR_ERR(bio); + mlog_errno(status); + goto bail_and_wait; + } + bios[i] = bio; + + submit_bio(READ, bio); + } + + status = 0; + +bail_and_wait: + o2hb_wait_on_io(reg, &wc); + + if (bios) { + for(i = 0; i < num_bios; i++) + if (bios[i]) + bio_put(bios[i]); + kfree(bios); + } + + return status; +} + +static int o2hb_issue_node_write(struct o2hb_region *reg, + struct bio **write_bio, + struct o2hb_bio_wait_ctxt *write_wc) +{ + int status; + unsigned int slot; + struct bio *bio; + + o2hb_bio_wait_init(write_wc, 1); + + slot = o2nm_this_node(); + + bio = o2hb_setup_one_bio(reg, write_wc, slot, 1); + if (IS_ERR(bio)) { + status = PTR_ERR(bio); + mlog_errno(status); + goto bail; + } + + submit_bio(WRITE, bio); + + *write_bio = bio; + status = 0; +bail: + return status; +} + +static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, + struct o2hb_disk_heartbeat_block *hb_block) +{ + __le32 old_cksum; + u32 ret; + + /* We want to compute the block crc with a 0 value in the + * hb_cksum field. Save it off here and replace after the + * crc. */ + old_cksum = hb_block->hb_cksum; + hb_block->hb_cksum = 0; + + ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); + + hb_block->hb_cksum = old_cksum; + + return ret; +} + +static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) +{ + mlog(ML_ERROR, "Dump slot information: seq = 0x%"MLFx64", node = %u, " + "cksum = 0x%x, generation 0x%"MLFx64"\n", + le64_to_cpu(hb_block->hb_seq), hb_block->hb_node, + le32_to_cpu(hb_block->hb_cksum), + le64_to_cpu(hb_block->hb_generation)); +} + +static int o2hb_verify_crc(struct o2hb_region *reg, + struct o2hb_disk_heartbeat_block *hb_block) +{ + u32 read, computed; + + read = le32_to_cpu(hb_block->hb_cksum); + computed = o2hb_compute_block_crc_le(reg, hb_block); + + return read == computed; +} + +/* We want to make sure that nobody is heartbeating on top of us -- + * this will help detect an invalid configuration. */ +static int o2hb_check_last_timestamp(struct o2hb_region *reg) +{ + int node_num, ret; + struct o2hb_disk_slot *slot; + struct o2hb_disk_heartbeat_block *hb_block; + + node_num = o2nm_this_node(); + + ret = 1; + slot = ®->hr_slots[node_num]; + /* Don't check on our 1st timestamp */ + if (slot->ds_last_time) { + hb_block = slot->ds_raw_block; + + if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time) + ret = 0; + } + + return ret; +} + +static inline void o2hb_prepare_block(struct o2hb_region *reg, + u64 generation) +{ + int node_num; + u64 cputime; + struct o2hb_disk_slot *slot; + struct o2hb_disk_heartbeat_block *hb_block; + + node_num = o2nm_this_node(); + slot = ®->hr_slots[node_num]; + + hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; + memset(hb_block, 0, reg->hr_block_bytes); + /* TODO: time stuff */ + cputime = CURRENT_TIME.tv_sec; + if (!cputime) + cputime = 1; + + hb_block->hb_seq = cpu_to_le64(cputime); + hb_block->hb_node = node_num; + hb_block->hb_generation = cpu_to_le64(generation); + + /* This step must always happen last! */ + hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, + hb_block)); + + mlog(ML_HB_BIO, "our node generation = 0x%"MLFx64", cksum = 0x%x\n", + cpu_to_le64(generation), le32_to_cpu(hb_block->hb_cksum)); +} + +static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, + struct o2nm_node *node, + int idx) +{ + struct list_head *iter; + struct o2hb_callback_func *f; + + list_for_each(iter, &hbcall->list) { + f = list_entry(iter, struct o2hb_callback_func, hc_item); + mlog(ML_HEARTBEAT, "calling funcs %p\n", f); + (f->hc_func)(node, idx, f->hc_data); + } +} + +/* Will run the list in order until we process the passed event */ +static void o2hb_run_event_list(struct o2hb_node_event *queued_event) +{ + int empty; + struct o2hb_callback *hbcall; + struct o2hb_node_event *event; + + spin_lock(&o2hb_live_lock); + empty = list_empty(&queued_event->hn_item); + spin_unlock(&o2hb_live_lock); + if (empty) + return; + + /* Holding callback sem assures we don't alter the callback + * lists when doing this, and serializes ourselves with other + * processes wanting callbacks. */ + down_write(&o2hb_callback_sem); + + spin_lock(&o2hb_live_lock); + while (!list_empty(&o2hb_node_events) + && !list_empty(&queued_event->hn_item)) { + event = list_entry(o2hb_node_events.next, + struct o2hb_node_event, + hn_item); + list_del_init(&event->hn_item); + spin_unlock(&o2hb_live_lock); + + mlog(ML_HEARTBEAT, "Node %s event for %d\n", + event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", + event->hn_node_num); + + hbcall = hbcall_from_type(event->hn_event_type); + + /* We should *never* have gotten on to the list with a + * bad type... This isn't something that we should try + * to recover from. */ + BUG_ON(IS_ERR(hbcall)); + + o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); + + spin_lock(&o2hb_live_lock); + } + spin_unlock(&o2hb_live_lock); + + up_write(&o2hb_callback_sem); +} + +static void o2hb_queue_node_event(struct o2hb_node_event *event, + enum o2hb_callback_type type, + struct o2nm_node *node, + int node_num) +{ + assert_spin_locked(&o2hb_live_lock); + + event->hn_event_type = type; + event->hn_node = node; + event->hn_node_num = node_num; + + mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", + type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); + + list_add_tail(&event->hn_item, &o2hb_node_events); +} + +static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) +{ + struct o2hb_node_event event = + { .hn_item = LIST_HEAD_INIT(event.hn_item), }; + struct o2nm_node *node; + + node = o2nm_get_node_by_num(slot->ds_node_num); + if (!node) + return; + + spin_lock(&o2hb_live_lock); + if (!list_empty(&slot->ds_live_item)) { + mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", + slot->ds_node_num); + + list_del_init(&slot->ds_live_item); + + if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { + clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); + + o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, + slot->ds_node_num); + } + } + spin_unlock(&o2hb_live_lock); + + o2hb_run_event_list(&event); + + o2nm_node_put(node); +} + +static int o2hb_check_slot(struct o2hb_region *reg, + struct o2hb_disk_slot *slot) +{ + int changed = 0, gen_changed = 0; + struct o2hb_node_event event = + { .hn_item = LIST_HEAD_INIT(event.hn_item), }; + struct o2nm_node *node; + struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; + u64 cputime; + + memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); + + /* Is this correct? Do we assume that the node doesn't exist + * if we're not configured for him? */ + node = o2nm_get_node_by_num(slot->ds_node_num); + if (!node) + return 0; + + if (!o2hb_verify_crc(reg, hb_block)) { + /* all paths from here will drop o2hb_live_lock for + * us. */ + spin_lock(&o2hb_live_lock); + + /* Don't print an error on the console in this case - + * a freshly formatted heartbeat area will not have a + * crc set on it. */ + if (list_empty(&slot->ds_live_item)) + goto out; + + /* The node is live but pushed out a bad crc. We + * consider it a transient miss but don't populate any + * other values as they may be junk. */ + mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", + slot->ds_node_num, reg->hr_dev_name); + o2hb_dump_slot(hb_block); + + slot->ds_equal_samples++; + goto fire_callbacks; + } + + /* we don't care if these wrap.. the state transitions below + * clear at the right places */ + cputime = le64_to_cpu(hb_block->hb_seq); + if (slot->ds_last_time != cputime) + slot->ds_changed_samples++; + else + slot->ds_equal_samples++; + slot->ds_last_time = cputime; + + /* The node changed heartbeat generations. We assume this to + * mean it dropped off but came back before we timed out. We + * want to consider it down for the time being but don't want + * to lose any changed_samples state we might build up to + * considering it live again. */ + if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { + gen_changed = 1; + slot->ds_equal_samples = 0; + mlog(ML_HEARTBEAT, "Node %d changed generation (0x%"MLFx64" " + "to 0x%"MLFx64")\n", slot->ds_node_num, + slot->ds_last_generation, + le64_to_cpu(hb_block->hb_generation)); + } + + slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); + + mlog(ML_HEARTBEAT, "Slot %d gen 0x%"MLFx64" cksum 0x%x " + "seq %"MLFu64" last %"MLFu64" changed %u equal %u\n", + slot->ds_node_num, slot->ds_last_generation, + le32_to_cpu(hb_block->hb_cksum), le64_to_cpu(hb_block->hb_seq), + slot->ds_last_time, slot->ds_changed_samples, + slot->ds_equal_samples); + + spin_lock(&o2hb_live_lock); + +fire_callbacks: + /* dead nodes only come to life after some number of + * changes at any time during their dead time */ + if (list_empty(&slot->ds_live_item) && + slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { + mlog(ML_HEARTBEAT, "Node %d (id 0x%"MLFx64") joined my " + "region\n", slot->ds_node_num, slot->ds_last_generation); + + /* first on the list generates a callback */ + if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { + set_bit(slot->ds_node_num, o2hb_live_node_bitmap); + + o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, + slot->ds_node_num); + + changed = 1; + } + + list_add_tail(&slot->ds_live_item, + &o2hb_live_slots[slot->ds_node_num]); + + slot->ds_equal_samples = 0; + goto out; + } + + /* if the list is dead, we're done.. */ + if (list_empty(&slot->ds_live_item)) + goto out; + + /* live nodes only go dead after enough consequtive missed + * samples.. reset the missed counter whenever we see + * activity */ + if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { + mlog(ML_HEARTBEAT, "Node %d left my region\n", + slot->ds_node_num); + + /* last off the live_slot generates a callback */ + list_del_init(&slot->ds_live_item); + if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { + clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); + + o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, + slot->ds_node_num); + + changed = 1; + } + + /* We don't clear this because the node is still + * actually writing new blocks. */ + if (!gen_changed) + slot->ds_changed_samples = 0; + goto out; + } + if (slot->ds_changed_samples) { + slot->ds_changed_samples = 0; + slot->ds_equal_samples = 0; + } +out: + spin_unlock(&o2hb_live_lock); + + o2hb_run_event_list(&event); + + o2nm_node_put(node); + return changed; +} + +/* This could be faster if we just implmented a find_last_bit, but I + * don't think the circumstances warrant it. */ +static int o2hb_highest_node(unsigned long *nodes, + int numbits) +{ + int highest, node; + + highest = numbits; + node = -1; + while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) { + if (node >= numbits) + break; + + highest = node; + } + + return highest; +} + +static void o2hb_do_disk_heartbeat(struct o2hb_region *reg) +{ + int i, ret, highest_node, change = 0; + unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; + struct bio *write_bio; + struct o2hb_bio_wait_ctxt write_wc; + + if (o2nm_configured_node_map(configured_nodes, sizeof(configured_nodes))) + return; + + highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); + if (highest_node >= O2NM_MAX_NODES) { + mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n"); + return; + } + + /* No sense in reading the slots of nodes that don't exist + * yet. Of course, if the node definitions have holes in them + * then we're reading an empty slot anyway... Consider this + * best-effort. */ + ret = o2hb_read_slots(reg, highest_node + 1); + if (ret < 0) { + mlog_errno(ret); + return; + } + + /* With an up to date view of the slots, we can check that no + * other node has been improperly configured to heartbeat in + * our slot. */ + if (!o2hb_check_last_timestamp(reg)) + mlog(ML_ERROR, "Device \"%s\": another node is heartbeating " + "in our slot!\n", reg->hr_dev_name); + + /* fill in the proper info for our next heartbeat */ + o2hb_prepare_block(reg, reg->hr_generation); + + /* And fire off the write. Note that we don't wait on this I/O + * until later. */ + ret = o2hb_issue_node_write(reg, &write_bio, &write_wc); + if (ret < 0) { + mlog_errno(ret); + return; + } + + i = -1; + while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { + + change |= o2hb_check_slot(reg, ®->hr_slots[i]); + } + + /* + * We have to be sure we've advertised ourselves on disk + * before we can go to steady state. This ensures that + * people we find in our steady state have seen us. + */ + o2hb_wait_on_io(reg, &write_wc); + bio_put(write_bio); + o2hb_arm_write_timeout(reg); + + /* let the person who launched us know when things are steady */ + if (!change && (atomic_read(®->hr_steady_iterations) != 0)) { + if (atomic_dec_and_test(®->hr_steady_iterations)) + wake_up(&o2hb_steady_queue); + } +} + +/* Subtract b from a, storing the result in a. a *must* have a larger + * value than b. */ +static void o2hb_tv_subtract(struct timeval *a, + struct timeval *b) +{ + /* just return 0 when a is after b */ + if (a->tv_sec < b->tv_sec || + (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) { + a->tv_sec = 0; + a->tv_usec = 0; + return; + } + + a->tv_sec -= b->tv_sec; + a->tv_usec -= b->tv_usec; + while ( a->tv_usec < 0 ) { + a->tv_sec--; + a->tv_usec += 1000000; + } +} + +static unsigned int o2hb_elapsed_msecs(struct timeval *start, + struct timeval *end) +{ + struct timeval res = *end; + + o2hb_tv_subtract(&res, start); + + return res.tv_sec * 1000 + res.tv_usec / 1000; +} + +/* + * we ride the region ref that the region dir holds. before the region + * dir is removed and drops it ref it will wait to tear down this + * thread. + */ +static int o2hb_thread(void *data) +{ + int i, ret; + struct o2hb_region *reg = data; + struct bio *write_bio; + struct o2hb_bio_wait_ctxt write_wc; + struct timeval before_hb, after_hb; + unsigned int elapsed_msec; + + mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); + + set_user_nice(current, -20); + + while (!kthread_should_stop() && !reg->hr_unclean_stop) { + /* We track the time spent inside + * o2hb_do_disk_heartbeat so that we avoid more then + * hr_timeout_ms between disk writes. On busy systems + * this should result in a heartbeat which is less + * likely to time itself out. */ + do_gettimeofday(&before_hb); + + o2hb_do_disk_heartbeat(reg); + + do_gettimeofday(&after_hb); + elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb); + + mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n", + before_hb.tv_sec, before_hb.tv_usec, + after_hb.tv_sec, after_hb.tv_usec, elapsed_msec); + + if (elapsed_msec < reg->hr_timeout_ms) { + /* the kthread api has blocked signals for us so no + * need to record the return value. */ + msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); + } + } + + o2hb_disarm_write_timeout(reg); + + /* unclean stop is only used in very bad situation */ + for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) + o2hb_shutdown_slot(®->hr_slots[i]); + + /* Explicit down notification - avoid forcing the other nodes + * to timeout on this region when we could just as easily + * write a clear generation - thus indicating to them that + * this node has left this region. + * + * XXX: Should we skip this on unclean_stop? */ + o2hb_prepare_block(reg, 0); + ret = o2hb_issue_node_write(reg, &write_bio, &write_wc); + if (ret == 0) { + o2hb_wait_on_io(reg, &write_wc); + bio_put(write_bio); + } else { + mlog_errno(ret); + } + + mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n"); + + return 0; +} + +void o2hb_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) + INIT_LIST_HEAD(&o2hb_callbacks[i].list); + + for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) + INIT_LIST_HEAD(&o2hb_live_slots[i]); + + INIT_LIST_HEAD(&o2hb_node_events); + + memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); +} + +/* if we're already in a callback then we're already serialized by the sem */ +static void o2hb_fill_node_map_from_callback(unsigned long *map, + unsigned bytes) +{ + BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); + + memcpy(map, &o2hb_live_node_bitmap, bytes); +} + +/* + * get a map of all nodes that are heartbeating in any regions + */ +void o2hb_fill_node_map(unsigned long *map, unsigned bytes) +{ + /* callers want to serialize this map and callbacks so that they + * can trust that they don't miss nodes coming to the party */ + down_read(&o2hb_callback_sem); + spin_lock(&o2hb_live_lock); + o2hb_fill_node_map_from_callback(map, bytes); + spin_unlock(&o2hb_live_lock); + up_read(&o2hb_callback_sem); +} +EXPORT_SYMBOL_GPL(o2hb_fill_node_map); + +/* + * heartbeat configfs bits. The heartbeat set is a default set under + * the cluster set in nodemanager.c. + */ + +static struct o2hb_region *to_o2hb_region(struct config_item *item) +{ + return item ? container_of(item, struct o2hb_region, hr_item) : NULL; +} + +/* drop_item only drops its ref after killing the thread, nothing should + * be using the region anymore. this has to clean up any state that + * attributes might have built up. */ +static void o2hb_region_release(struct config_item *item) +{ + int i; + struct page *page; + struct o2hb_region *reg = to_o2hb_region(item); + + if (reg->hr_tmp_block) + kfree(reg->hr_tmp_block); + + if (reg->hr_slot_data) { + for (i = 0; i < reg->hr_num_pages; i++) { + page = reg->hr_slot_data[i]; + if (page) + __free_page(page); + } + kfree(reg->hr_slot_data); + } + + if (reg->hr_bdev) + blkdev_put(reg->hr_bdev); + + if (reg->hr_slots) + kfree(reg->hr_slots); + + spin_lock(&o2hb_live_lock); + list_del(®->hr_all_item); + spin_unlock(&o2hb_live_lock); + + kfree(reg); +} + +static int o2hb_read_block_input(struct o2hb_region *reg, + const char *page, + size_t count, + unsigned long *ret_bytes, + unsigned int *ret_bits) +{ + unsigned long bytes; + char *p = (char *)page; + + bytes = simple_strtoul(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + /* Heartbeat and fs min / max block sizes are the same. */ + if (bytes > 4096 || bytes < 512) + return -ERANGE; + if (hweight16(bytes) != 1) + return -EINVAL; + + if (ret_bytes) + *ret_bytes = bytes; + if (ret_bits) + *ret_bits = ffs(bytes) - 1; + + return 0; +} + +static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, + char *page) +{ + return sprintf(page, "%u\n", reg->hr_block_bytes); +} + +static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, + const char *page, + size_t count) +{ + int status; + unsigned long block_bytes; + unsigned int block_bits; + + if (reg->hr_bdev) + return -EINVAL; + + status = o2hb_read_block_input(reg, page, count, + &block_bytes, &block_bits); + if (status) + return status; + + reg->hr_block_bytes = (unsigned int)block_bytes; + reg->hr_block_bits = block_bits; + + return count; +} + +static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, + char *page) +{ + return sprintf(page, "%llu\n", reg->hr_start_block); +} + +static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, + const char *page, + size_t count) +{ + unsigned long long tmp; + char *p = (char *)page; + + if (reg->hr_bdev) + return -EINVAL; + + tmp = simple_strtoull(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + reg->hr_start_block = tmp; + + return count; +} + +static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, + char *page) +{ + return sprintf(page, "%d\n", reg->hr_blocks); +} + +static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, + const char *page, + size_t count) +{ + unsigned long tmp; + char *p = (char *)page; + + if (reg->hr_bdev) + return -EINVAL; + + tmp = simple_strtoul(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + if (tmp > O2NM_MAX_NODES || tmp == 0) + return -ERANGE; + + reg->hr_blocks = (unsigned int)tmp; + + return count; +} + +static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, + char *page) +{ + unsigned int ret = 0; + + if (reg->hr_bdev) + ret = sprintf(page, "%s\n", reg->hr_dev_name); + + return ret; +} + +static void o2hb_init_region_params(struct o2hb_region *reg) +{ + reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; + reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; + + mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", + reg->hr_start_block, reg->hr_blocks); + mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", + reg->hr_block_bytes, reg->hr_block_bits); + mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); + mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); +} + +static int o2hb_map_slot_data(struct o2hb_region *reg) +{ + int i, j; + unsigned int last_slot; + unsigned int spp = reg->hr_slots_per_page; + struct page *page; + char *raw; + struct o2hb_disk_slot *slot; + + reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); + if (reg->hr_tmp_block == NULL) { + mlog_errno(-ENOMEM); + return -ENOMEM; + } + + reg->hr_slots = kcalloc(reg->hr_blocks, + sizeof(struct o2hb_disk_slot), GFP_KERNEL); + if (reg->hr_slots == NULL) { + mlog_errno(-ENOMEM); + return -ENOMEM; + } + + for(i = 0; i < reg->hr_blocks; i++) { + slot = ®->hr_slots[i]; + slot->ds_node_num = i; + INIT_LIST_HEAD(&slot->ds_live_item); + slot->ds_raw_block = NULL; + } + + reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; + mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " + "at %u blocks per page\n", + reg->hr_num_pages, reg->hr_blocks, spp); + + reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), + GFP_KERNEL); + if (!reg->hr_slot_data) { + mlog_errno(-ENOMEM); + return -ENOMEM; + } + + for(i = 0; i < reg->hr_num_pages; i++) { + page = alloc_page(GFP_KERNEL); + if (!page) { + mlog_errno(-ENOMEM); + return -ENOMEM; + } + + reg->hr_slot_data[i] = page; + + last_slot = i * spp; + raw = page_address(page); + for (j = 0; + (j < spp) && ((j + last_slot) < reg->hr_blocks); + j++) { + BUG_ON((j + last_slot) >= reg->hr_blocks); + + slot = ®->hr_slots[j + last_slot]; + slot->ds_raw_block = + (struct o2hb_disk_heartbeat_block *) raw; + + raw += reg->hr_block_bytes; + } + } + + return 0; +} + +/* Read in all the slots available and populate the tracking + * structures so that we can start with a baseline idea of what's + * there. */ +static int o2hb_populate_slot_data(struct o2hb_region *reg) +{ + int ret, i; + struct o2hb_disk_slot *slot; + struct o2hb_disk_heartbeat_block *hb_block; + + mlog_entry_void(); + + ret = o2hb_read_slots(reg, reg->hr_blocks); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* We only want to get an idea of the values initially in each + * slot, so we do no verification - o2hb_check_slot will + * actually determine if each configured slot is valid and + * whether any values have changed. */ + for(i = 0; i < reg->hr_blocks; i++) { + slot = ®->hr_slots[i]; + hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; + + /* Only fill the values that o2hb_check_slot uses to + * determine changing slots */ + slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); + slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); + } + +out: + mlog_exit(ret); + return ret; +} + +/* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ +static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, + const char *page, + size_t count) +{ + long fd; + int sectsize; + char *p = (char *)page; + struct file *filp = NULL; + struct inode *inode = NULL; + ssize_t ret = -EINVAL; + + if (reg->hr_bdev) + goto out; + + /* We can't heartbeat without having had our node number + * configured yet. */ + if (o2nm_this_node() == O2NM_MAX_NODES) + goto out; + + fd = simple_strtol(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + goto out; + + if (fd < 0 || fd >= INT_MAX) + goto out; + + filp = fget(fd); + if (filp == NULL) + goto out; + + if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || + reg->hr_block_bytes == 0) + goto out; + + inode = igrab(filp->f_mapping->host); + if (inode == NULL) + goto out; + + if (!S_ISBLK(inode->i_mode)) + goto out; + + reg->hr_bdev = I_BDEV(filp->f_mapping->host); + ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, 0); + if (ret) { + reg->hr_bdev = NULL; + goto out; + } + inode = NULL; + + bdevname(reg->hr_bdev, reg->hr_dev_name); + + sectsize = bdev_hardsect_size(reg->hr_bdev); + if (sectsize != reg->hr_block_bytes) { + mlog(ML_ERROR, + "blocksize %u incorrect for device, expected %d", + reg->hr_block_bytes, sectsize); + ret = -EINVAL; + goto out; + } + + o2hb_init_region_params(reg); + + /* Generation of zero is invalid */ + do { + get_random_bytes(®->hr_generation, + sizeof(reg->hr_generation)); + } while (reg->hr_generation == 0); + + ret = o2hb_map_slot_data(reg); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = o2hb_populate_slot_data(reg); + if (ret) { + mlog_errno(ret); + goto out; + } + + INIT_WORK(®->hr_write_timeout_work, o2hb_write_timeout, reg); + + /* + * A node is considered live after it has beat LIVE_THRESHOLD + * times. We're not steady until we've given them a chance + * _after_ our first read. + */ + atomic_set(®->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1); + + reg->hr_task = kthread_run(o2hb_thread, reg, "o2hb-%s", + reg->hr_item.ci_name); + if (IS_ERR(reg->hr_task)) { + ret = PTR_ERR(reg->hr_task); + mlog_errno(ret); + reg->hr_task = NULL; + goto out; + } + + ret = wait_event_interruptible(o2hb_steady_queue, + atomic_read(®->hr_steady_iterations) == 0); + if (ret) { + kthread_stop(reg->hr_task); + reg->hr_task = NULL; + goto out; + } + + ret = count; +out: + if (filp) + fput(filp); + if (inode) + iput(inode); + if (ret < 0) { + if (reg->hr_bdev) { + blkdev_put(reg->hr_bdev); + reg->hr_bdev = NULL; + } + } + return ret; +} + +struct o2hb_region_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct o2hb_region *, char *); + ssize_t (*store)(struct o2hb_region *, const char *, size_t); +}; + +static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "block_bytes", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2hb_region_block_bytes_read, + .store = o2hb_region_block_bytes_write, +}; + +static struct o2hb_region_attribute o2hb_region_attr_start_block = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "start_block", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2hb_region_start_block_read, + .store = o2hb_region_start_block_write, +}; + +static struct o2hb_region_attribute o2hb_region_attr_blocks = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "blocks", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2hb_region_blocks_read, + .store = o2hb_region_blocks_write, +}; + +static struct o2hb_region_attribute o2hb_region_attr_dev = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "dev", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2hb_region_dev_read, + .store = o2hb_region_dev_write, +}; + +static struct configfs_attribute *o2hb_region_attrs[] = { + &o2hb_region_attr_block_bytes.attr, + &o2hb_region_attr_start_block.attr, + &o2hb_region_attr_blocks.attr, + &o2hb_region_attr_dev.attr, + NULL, +}; + +static ssize_t o2hb_region_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct o2hb_region *reg = to_o2hb_region(item); + struct o2hb_region_attribute *o2hb_region_attr = + container_of(attr, struct o2hb_region_attribute, attr); + ssize_t ret = 0; + + if (o2hb_region_attr->show) + ret = o2hb_region_attr->show(reg, page); + return ret; +} + +static ssize_t o2hb_region_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct o2hb_region *reg = to_o2hb_region(item); + struct o2hb_region_attribute *o2hb_region_attr = + container_of(attr, struct o2hb_region_attribute, attr); + ssize_t ret = -EINVAL; + + if (o2hb_region_attr->store) + ret = o2hb_region_attr->store(reg, page, count); + return ret; +} + +static struct configfs_item_operations o2hb_region_item_ops = { + .release = o2hb_region_release, + .show_attribute = o2hb_region_show, + .store_attribute = o2hb_region_store, +}; + +static struct config_item_type o2hb_region_type = { + .ct_item_ops = &o2hb_region_item_ops, + .ct_attrs = o2hb_region_attrs, + .ct_owner = THIS_MODULE, +}; + +/* heartbeat set */ + +struct o2hb_heartbeat_group { + struct config_group hs_group; + /* some stuff? */ +}; + +static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) +{ + return group ? + container_of(group, struct o2hb_heartbeat_group, hs_group) + : NULL; +} + +static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, + const char *name) +{ + struct o2hb_region *reg = NULL; + struct config_item *ret = NULL; + + reg = kcalloc(1, sizeof(struct o2hb_region), GFP_KERNEL); + if (reg == NULL) + goto out; /* ENOMEM */ + + config_item_init_type_name(®->hr_item, name, &o2hb_region_type); + + ret = ®->hr_item; + + spin_lock(&o2hb_live_lock); + list_add_tail(®->hr_all_item, &o2hb_all_regions); + spin_unlock(&o2hb_live_lock); +out: + if (ret == NULL) + kfree(reg); + + return ret; +} + +static void o2hb_heartbeat_group_drop_item(struct config_group *group, + struct config_item *item) +{ + struct o2hb_region *reg = to_o2hb_region(item); + + /* stop the thread when the user removes the region dir */ + if (reg->hr_task) { + kthread_stop(reg->hr_task); + reg->hr_task = NULL; + } + + config_item_put(item); +} + +struct o2hb_heartbeat_group_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct o2hb_heartbeat_group *, char *); + ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); +}; + +static ssize_t o2hb_heartbeat_group_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); + struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = + container_of(attr, struct o2hb_heartbeat_group_attribute, attr); + ssize_t ret = 0; + + if (o2hb_heartbeat_group_attr->show) + ret = o2hb_heartbeat_group_attr->show(reg, page); + return ret; +} + +static ssize_t o2hb_heartbeat_group_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); + struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = + container_of(attr, struct o2hb_heartbeat_group_attribute, attr); + ssize_t ret = -EINVAL; + + if (o2hb_heartbeat_group_attr->store) + ret = o2hb_heartbeat_group_attr->store(reg, page, count); + return ret; +} + +static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, + char *page) +{ + return sprintf(page, "%u\n", o2hb_dead_threshold); +} + +static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, + const char *page, + size_t count) +{ + unsigned long tmp; + char *p = (char *)page; + + tmp = simple_strtoul(p, &p, 10); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + /* this will validate ranges for us. */ + o2hb_dead_threshold_set((unsigned int) tmp); + + return count; +} + +static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "dead_threshold", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2hb_heartbeat_group_threshold_show, + .store = o2hb_heartbeat_group_threshold_store, +}; + +static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { + &o2hb_heartbeat_group_attr_threshold.attr, + NULL, +}; + +static struct configfs_item_operations o2hb_hearbeat_group_item_ops = { + .show_attribute = o2hb_heartbeat_group_show, + .store_attribute = o2hb_heartbeat_group_store, +}; + +static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { + .make_item = o2hb_heartbeat_group_make_item, + .drop_item = o2hb_heartbeat_group_drop_item, +}; + +static struct config_item_type o2hb_heartbeat_group_type = { + .ct_group_ops = &o2hb_heartbeat_group_group_ops, + .ct_item_ops = &o2hb_hearbeat_group_item_ops, + .ct_attrs = o2hb_heartbeat_group_attrs, + .ct_owner = THIS_MODULE, +}; + +/* this is just here to avoid touching group in heartbeat.h which the + * entire damn world #includes */ +struct config_group *o2hb_alloc_hb_set(void) +{ + struct o2hb_heartbeat_group *hs = NULL; + struct config_group *ret = NULL; + + hs = kcalloc(1, sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); + if (hs == NULL) + goto out; + + config_group_init_type_name(&hs->hs_group, "heartbeat", + &o2hb_heartbeat_group_type); + + ret = &hs->hs_group; +out: + if (ret == NULL) + kfree(hs); + return ret; +} + +void o2hb_free_hb_set(struct config_group *group) +{ + struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); + kfree(hs); +} + +/* hb callback registration and issueing */ + +static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) +{ + if (type == O2HB_NUM_CB) + return ERR_PTR(-EINVAL); + + return &o2hb_callbacks[type]; +} + +void o2hb_setup_callback(struct o2hb_callback_func *hc, + enum o2hb_callback_type type, + o2hb_cb_func *func, + void *data, + int priority) +{ + INIT_LIST_HEAD(&hc->hc_item); + hc->hc_func = func; + hc->hc_data = data; + hc->hc_priority = priority; + hc->hc_type = type; + hc->hc_magic = O2HB_CB_MAGIC; +} +EXPORT_SYMBOL_GPL(o2hb_setup_callback); + +int o2hb_register_callback(struct o2hb_callback_func *hc) +{ + struct o2hb_callback_func *tmp; + struct list_head *iter; + struct o2hb_callback *hbcall; + int ret; + + BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); + BUG_ON(!list_empty(&hc->hc_item)); + + hbcall = hbcall_from_type(hc->hc_type); + if (IS_ERR(hbcall)) { + ret = PTR_ERR(hbcall); + goto out; + } + + down_write(&o2hb_callback_sem); + + list_for_each(iter, &hbcall->list) { + tmp = list_entry(iter, struct o2hb_callback_func, hc_item); + if (hc->hc_priority < tmp->hc_priority) { + list_add_tail(&hc->hc_item, iter); + break; + } + } + if (list_empty(&hc->hc_item)) + list_add_tail(&hc->hc_item, &hbcall->list); + + up_write(&o2hb_callback_sem); + ret = 0; +out: + mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n", + ret, __builtin_return_address(0), hc); + return ret; +} +EXPORT_SYMBOL_GPL(o2hb_register_callback); + +int o2hb_unregister_callback(struct o2hb_callback_func *hc) +{ + BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); + + mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n", + __builtin_return_address(0), hc); + + if (list_empty(&hc->hc_item)) + return 0; + + down_write(&o2hb_callback_sem); + + list_del_init(&hc->hc_item); + + up_write(&o2hb_callback_sem); + + return 0; +} +EXPORT_SYMBOL_GPL(o2hb_unregister_callback); + +int o2hb_check_node_heartbeating(u8 node_num) +{ + unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + + o2hb_fill_node_map(testing_map, sizeof(testing_map)); + if (!test_bit(node_num, testing_map)) { + mlog(ML_HEARTBEAT, + "node (%u) does not have heartbeating enabled.\n", + node_num); + return 0; + } + + return 1; +} +EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); + +int o2hb_check_node_heartbeating_from_callback(u8 node_num) +{ + unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + + o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); + if (!test_bit(node_num, testing_map)) { + mlog(ML_HEARTBEAT, + "node (%u) does not have heartbeating enabled.\n", + node_num); + return 0; + } + + return 1; +} +EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); + +/* Makes sure our local node is configured with a node number, and is + * heartbeating. */ +int o2hb_check_local_node_heartbeating(void) +{ + u8 node_num; + + /* if this node was set then we have networking */ + node_num = o2nm_this_node(); + if (node_num == O2NM_MAX_NODES) { + mlog(ML_HEARTBEAT, "this node has not been configured.\n"); + return 0; + } + + return o2hb_check_node_heartbeating(node_num); +} +EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); + +/* + * this is just a hack until we get the plumbing which flips file systems + * read only and drops the hb ref instead of killing the node dead. + */ +void o2hb_stop_all_regions(void) +{ + struct o2hb_region *reg; + + mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); + + spin_lock(&o2hb_live_lock); + + list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) + reg->hr_unclean_stop = 1; + + spin_unlock(&o2hb_live_lock); +} +EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); diff --git a/fs/ocfs2/cluster/heartbeat.h b/fs/ocfs2/cluster/heartbeat.h new file mode 100644 index 0000000..cac6223 --- /dev/null +++ b/fs/ocfs2/cluster/heartbeat.h @@ -0,0 +1,82 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * heartbeat.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef O2CLUSTER_HEARTBEAT_H +#define O2CLUSTER_HEARTBEAT_H + +#include "ocfs2_heartbeat.h" + +#define O2HB_REGION_TIMEOUT_MS 2000 + +/* number of changes to be seen as live */ +#define O2HB_LIVE_THRESHOLD 2 +/* number of equal samples to be seen as dead */ +extern unsigned int o2hb_dead_threshold; +#define O2HB_DEFAULT_DEAD_THRESHOLD 7 +/* Otherwise MAX_WRITE_TIMEOUT will be zero... */ +#define O2HB_MIN_DEAD_THRESHOLD 2 +#define O2HB_MAX_WRITE_TIMEOUT_MS (O2HB_REGION_TIMEOUT_MS * (o2hb_dead_threshold - 1)) + +#define O2HB_CB_MAGIC 0x51d1e4ec + +/* callback stuff */ +enum o2hb_callback_type { + O2HB_NODE_DOWN_CB = 0, + O2HB_NODE_UP_CB, + O2HB_NUM_CB +}; + +struct o2nm_node; +typedef void (o2hb_cb_func)(struct o2nm_node *, int, void *); + +struct o2hb_callback_func { + u32 hc_magic; + struct list_head hc_item; + o2hb_cb_func *hc_func; + void *hc_data; + int hc_priority; + enum o2hb_callback_type hc_type; +}; + +struct config_group *o2hb_alloc_hb_set(void); +void o2hb_free_hb_set(struct config_group *group); + +void o2hb_setup_callback(struct o2hb_callback_func *hc, + enum o2hb_callback_type type, + o2hb_cb_func *func, + void *data, + int priority); +int o2hb_register_callback(struct o2hb_callback_func *hc); +int o2hb_unregister_callback(struct o2hb_callback_func *hc); +void o2hb_fill_node_map(unsigned long *map, + unsigned bytes); +void o2hb_init(void); +int o2hb_check_node_heartbeating(u8 node_num); +int o2hb_check_node_heartbeating_from_callback(u8 node_num); +int o2hb_check_local_node_heartbeating(void); +void o2hb_stop_all_regions(void); + +#endif /* O2CLUSTER_HEARTBEAT_H */ diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c new file mode 100644 index 0000000..fd741ce --- /dev/null +++ b/fs/ocfs2/cluster/masklog.c @@ -0,0 +1,166 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <asm/uaccess.h> + +#include "masklog.h" + +struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK); +EXPORT_SYMBOL_GPL(mlog_and_bits); +struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(MLOG_INITIAL_NOT_MASK); +EXPORT_SYMBOL_GPL(mlog_not_bits); + +static ssize_t mlog_mask_show(u64 mask, char *buf) +{ + char *state; + + if (__mlog_test_u64(mask, mlog_and_bits)) + state = "allow"; + else if (__mlog_test_u64(mask, mlog_not_bits)) + state = "deny"; + else + state = "off"; + + return snprintf(buf, PAGE_SIZE, "%s\n", state); +} + +static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count) +{ + if (!strnicmp(buf, "allow", 5)) { + __mlog_set_u64(mask, mlog_and_bits); + __mlog_clear_u64(mask, mlog_not_bits); + } else if (!strnicmp(buf, "deny", 4)) { + __mlog_set_u64(mask, mlog_not_bits); + __mlog_clear_u64(mask, mlog_and_bits); + } else if (!strnicmp(buf, "off", 3)) { + __mlog_clear_u64(mask, mlog_not_bits); + __mlog_clear_u64(mask, mlog_and_bits); + } else + return -EINVAL; + + return count; +} + +struct mlog_attribute { + struct attribute attr; + u64 mask; +}; + +#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr) + +#define define_mask(_name) { \ + .attr = { \ + .name = #_name, \ + .mode = S_IRUGO | S_IWUSR, \ + }, \ + .mask = ML_##_name, \ +} + +static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = { + define_mask(ENTRY), + define_mask(EXIT), + define_mask(TCP), + define_mask(MSG), + define_mask(SOCKET), + define_mask(HEARTBEAT), + define_mask(HB_BIO), + define_mask(DLMFS), + define_mask(DLM), + define_mask(DLM_DOMAIN), + define_mask(DLM_THREAD), + define_mask(DLM_MASTER), + define_mask(DLM_RECOVERY), + define_mask(AIO), + define_mask(JOURNAL), + define_mask(DISK_ALLOC), + define_mask(SUPER), + define_mask(FILE_IO), + define_mask(EXTENT_MAP), + define_mask(DLM_GLUE), + define_mask(BH_IO), + define_mask(UPTODATE), + define_mask(NAMEI), + define_mask(INODE), + define_mask(VOTE), + define_mask(DCACHE), + define_mask(CONN), + define_mask(QUORUM), + define_mask(EXPORT), + define_mask(ERROR), + define_mask(NOTICE), + define_mask(KTHREAD), +}; + +static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, }; + +static ssize_t mlog_show(struct kobject *obj, struct attribute *attr, + char *buf) +{ + struct mlog_attribute *mlog_attr = to_mlog_attr(attr); + + return mlog_mask_show(mlog_attr->mask, buf); +} + +static ssize_t mlog_store(struct kobject *obj, struct attribute *attr, + const char *buf, size_t count) +{ + struct mlog_attribute *mlog_attr = to_mlog_attr(attr); + + return mlog_mask_store(mlog_attr->mask, buf, count); +} + +static struct sysfs_ops mlog_attr_ops = { + .show = mlog_show, + .store = mlog_store, +}; + +static struct kobj_type mlog_ktype = { + .default_attrs = mlog_attr_ptrs, + .sysfs_ops = &mlog_attr_ops, +}; + +static struct kset mlog_kset = { + .kobj = {.name = "logmask", .ktype = &mlog_ktype}, +}; + +int mlog_sys_init(struct subsystem *o2cb_subsys) +{ + int i = 0; + + while (mlog_attrs[i].attr.mode) { + mlog_attr_ptrs[i] = &mlog_attrs[i].attr; + i++; + } + mlog_attr_ptrs[i] = NULL; + + mlog_kset.subsys = o2cb_subsys; + return kset_register(&mlog_kset); +} + +void mlog_sys_shutdown(void) +{ + kset_unregister(&mlog_kset); +} diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h new file mode 100644 index 0000000..f5ef5ea --- /dev/null +++ b/fs/ocfs2/cluster/masklog.h @@ -0,0 +1,275 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef O2CLUSTER_MASKLOG_H +#define O2CLUSTER_MASKLOG_H + +/* + * For now this is a trivial wrapper around printk() that gives the critical + * ability to enable sets of debugging output at run-time. In the future this + * will almost certainly be redirected to relayfs so that it can pay a + * substantially lower heisenberg tax. + * + * Callers associate the message with a bitmask and a global bitmask is + * maintained with help from /proc. If any of the bits match the message is + * output. + * + * We must have efficient bit tests on i386 and it seems gcc still emits crazy + * code for the 64bit compare. It emits very good code for the dual unsigned + * long tests, though, completely avoiding tests that can never pass if the + * caller gives a constant bitmask that fills one of the longs with all 0s. So + * the desire is to have almost all of the calls decided on by comparing just + * one of the longs. This leads to having infrequently given bits that are + * frequently matched in the high bits. + * + * _ERROR and _NOTICE are used for messages that always go to the console and + * have appropriate KERN_ prefixes. We wrap these in our function instead of + * just calling printk() so that this can eventually make its way through + * relayfs along with the debugging messages. Everything else gets KERN_DEBUG. + * The inline tests and macro dance give GCC the opportunity to quite cleverly + * only emit the appropriage printk() when the caller passes in a constant + * mask, as is almost always the case. + * + * All this bitmask nonsense is hidden from the /proc interface so that Joel + * doesn't have an aneurism. Reading the file gives a straight forward + * indication of which bits are on or off: + * ENTRY off + * EXIT off + * TCP off + * MSG off + * SOCKET off + * ERROR off + * NOTICE on + * + * Writing changes the state of a given bit and requires a strictly formatted + * single write() call: + * + * write(fd, "ENTRY on", 8); + * + * would turn the entry bit on. "1" is also accepted in the place of "on", and + * "off" and "0" behave as expected. + * + * Some trivial shell can flip all the bits on or off: + * + * log_mask="/proc/fs/ocfs2_nodemanager/log_mask" + * cat $log_mask | ( + * while read bit status; do + * # $1 is "on" or "off", say + * echo "$bit $1" > $log_mask + * done + * ) + */ + +/* for task_struct */ +#include <linux/sched.h> + +/* bits that are frequently given and infrequently matched in the low word */ +/* NOTE: If you add a flag, you need to also update mlog.c! */ +#define ML_ENTRY 0x0000000000000001ULL /* func call entry */ +#define ML_EXIT 0x0000000000000002ULL /* func call exit */ +#define ML_TCP 0x0000000000000004ULL /* net cluster/tcp.c */ +#define ML_MSG 0x0000000000000008ULL /* net network messages */ +#define ML_SOCKET 0x0000000000000010ULL /* net socket lifetime */ +#define ML_HEARTBEAT 0x0000000000000020ULL /* hb all heartbeat tracking */ +#define ML_HB_BIO 0x0000000000000040ULL /* hb io tracing */ +#define ML_DLMFS 0x0000000000000080ULL /* dlm user dlmfs */ +#define ML_DLM 0x0000000000000100ULL /* dlm general debugging */ +#define ML_DLM_DOMAIN 0x0000000000000200ULL /* dlm domain debugging */ +#define ML_DLM_THREAD 0x0000000000000400ULL /* dlm domain thread */ +#define ML_DLM_MASTER 0x0000000000000800ULL /* dlm master functions */ +#define ML_DLM_RECOVERY 0x0000000000001000ULL /* dlm master functions */ +#define ML_AIO 0x0000000000002000ULL /* ocfs2 aio read and write */ +#define ML_JOURNAL 0x0000000000004000ULL /* ocfs2 journalling functions */ +#define ML_DISK_ALLOC 0x0000000000008000ULL /* ocfs2 disk allocation */ +#define ML_SUPER 0x0000000000010000ULL /* ocfs2 mount / umount */ +#define ML_FILE_IO 0x0000000000020000ULL /* ocfs2 file I/O */ +#define ML_EXTENT_MAP 0x0000000000040000ULL /* ocfs2 extent map caching */ +#define ML_DLM_GLUE 0x0000000000080000ULL /* ocfs2 dlm glue layer */ +#define ML_BH_IO 0x0000000000100000ULL /* ocfs2 buffer I/O */ +#define ML_UPTODATE 0x0000000000200000ULL /* ocfs2 caching sequence #'s */ +#define ML_NAMEI 0x0000000000400000ULL /* ocfs2 directory / namespace */ +#define ML_INODE 0x0000000000800000ULL /* ocfs2 inode manipulation */ +#define ML_VOTE 0x0000000001000000ULL /* ocfs2 node messaging */ +#define ML_DCACHE 0x0000000002000000ULL /* ocfs2 dcache operations */ +#define ML_CONN 0x0000000004000000ULL /* net connection management */ +#define ML_QUORUM 0x0000000008000000ULL /* net connection quorum */ +#define ML_EXPORT 0x0000000010000000ULL /* ocfs2 export operations */ +/* bits that are infrequently given and frequently matched in the high word */ +#define ML_ERROR 0x0000000100000000ULL /* sent to KERN_ERR */ +#define ML_NOTICE 0x0000000200000000ULL /* setn to KERN_NOTICE */ +#define ML_KTHREAD 0x0000000400000000ULL /* kernel thread activity */ + +#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE) +#define MLOG_INITIAL_NOT_MASK (ML_ENTRY|ML_EXIT) +#ifndef MLOG_MASK_PREFIX +#define MLOG_MASK_PREFIX 0 +#endif + +#define MLOG_MAX_BITS 64 + +struct mlog_bits { + unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG]; +}; + +extern struct mlog_bits mlog_and_bits, mlog_not_bits; + +#if BITS_PER_LONG == 32 + +#define __mlog_test_u64(mask, bits) \ + ( (u32)(mask & 0xffffffff) & bits.words[0] || \ + ((u64)(mask) >> 32) & bits.words[1] ) +#define __mlog_set_u64(mask, bits) do { \ + bits.words[0] |= (u32)(mask & 0xffffffff); \ + bits.words[1] |= (u64)(mask) >> 32; \ +} while (0) +#define __mlog_clear_u64(mask, bits) do { \ + bits.words[0] &= ~((u32)(mask & 0xffffffff)); \ + bits.words[1] &= ~((u64)(mask) >> 32); \ +} while (0) +#define MLOG_BITS_RHS(mask) { \ + { \ + [0] = (u32)(mask & 0xffffffff), \ + [1] = (u64)(mask) >> 32, \ + } \ +} + +#else /* 32bit long above, 64bit long below */ + +#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0]) +#define __mlog_set_u64(mask, bits) do { \ + bits.words[0] |= (mask); \ +} while (0) +#define __mlog_clear_u64(mask, bits) do { \ + bits.words[0] &= ~(mask); \ +} while (0) +#define MLOG_BITS_RHS(mask) { { (mask) } } + +#endif + +/* + * smp_processor_id() "helpfully" screams when called outside preemptible + * regions in current kernels. sles doesn't have the variants that don't + * scream. just do this instead of trying to guess which we're building + * against.. *sigh*. + */ +#define __mlog_cpu_guess ({ \ + unsigned long _cpu = get_cpu(); \ + put_cpu(); \ + _cpu; \ +}) + +/* In the following two macros, the whitespace after the ',' just + * before ##args is intentional. Otherwise, gcc 2.95 will eat the + * previous token if args expands to nothing. + */ +#define __mlog_printk(level, fmt, args...) \ + printk(level "(%u,%lu):%s:%d " fmt, current->pid, \ + __mlog_cpu_guess, __PRETTY_FUNCTION__, __LINE__ , \ + ##args) + +#define mlog(mask, fmt, args...) do { \ + u64 __m = MLOG_MASK_PREFIX | (mask); \ + if (__mlog_test_u64(__m, mlog_and_bits) && \ + !__mlog_test_u64(__m, mlog_not_bits)) { \ + if (__m & ML_ERROR) \ + __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \ + else if (__m & ML_NOTICE) \ + __mlog_printk(KERN_NOTICE, fmt , ##args); \ + else __mlog_printk(KERN_INFO, fmt , ##args); \ + } \ +} while (0) + +#define mlog_errno(st) do { \ + int _st = (st); \ + if (_st != -ERESTARTSYS && _st != -EINTR && \ + _st != AOP_TRUNCATED_PAGE) \ + mlog(ML_ERROR, "status = %lld\n", (long long)_st); \ +} while (0) + +#define mlog_entry(fmt, args...) do { \ + mlog(ML_ENTRY, "ENTRY:" fmt , ##args); \ +} while (0) + +#define mlog_entry_void() do { \ + mlog(ML_ENTRY, "ENTRY:\n"); \ +} while (0) + +/* We disable this for old compilers since they don't have support for + * __builtin_types_compatible_p. + */ +#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && \ + !defined(__CHECKER__) +#define mlog_exit(st) do { \ + if (__builtin_types_compatible_p(typeof(st), unsigned long)) \ + mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st)); \ + else if (__builtin_types_compatible_p(typeof(st), signed long)) \ + mlog(ML_EXIT, "EXIT: %ld\n", (signed long) (st)); \ + else if (__builtin_types_compatible_p(typeof(st), unsigned int) \ + || __builtin_types_compatible_p(typeof(st), unsigned short) \ + || __builtin_types_compatible_p(typeof(st), unsigned char)) \ + mlog(ML_EXIT, "EXIT: %u\n", (unsigned int) (st)); \ + else if (__builtin_types_compatible_p(typeof(st), signed int) \ + || __builtin_types_compatible_p(typeof(st), signed short) \ + || __builtin_types_compatible_p(typeof(st), signed char)) \ + mlog(ML_EXIT, "EXIT: %d\n", (signed int) (st)); \ + else if (__builtin_types_compatible_p(typeof(st), long long)) \ + mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \ + else \ + mlog(ML_EXIT, "EXIT: %llu\n", (unsigned long long) (st)); \ +} while (0) +#else +#define mlog_exit(st) do { \ + mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \ +} while (0) +#endif + +#define mlog_exit_ptr(ptr) do { \ + mlog(ML_EXIT, "EXIT: %p\n", ptr); \ +} while (0) + +#define mlog_exit_void() do { \ + mlog(ML_EXIT, "EXIT\n"); \ +} while (0) + +#define mlog_bug_on_msg(cond, fmt, args...) do { \ + if (cond) { \ + mlog(ML_ERROR, "bug expression: " #cond "\n"); \ + mlog(ML_ERROR, fmt, ##args); \ + BUG(); \ + } \ +} while (0) + +#if (BITS_PER_LONG == 32) || defined(CONFIG_X86_64) +#define MLFi64 "lld" +#define MLFu64 "llu" +#define MLFx64 "llx" +#else +#define MLFi64 "ld" +#define MLFu64 "lu" +#define MLFx64 "lx" +#endif + +#include <linux/kobject.h> +#include <linux/sysfs.h> +int mlog_sys_init(struct subsystem *o2cb_subsys); +void mlog_sys_shutdown(void); + +#endif /* O2CLUSTER_MASKLOG_H */ diff --git a/fs/ocfs2/cluster/nodemanager.c b/fs/ocfs2/cluster/nodemanager.c new file mode 100644 index 0000000..5fd60c1 --- /dev/null +++ b/fs/ocfs2/cluster/nodemanager.c @@ -0,0 +1,791 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sysctl.h> +#include <linux/configfs.h> + +#include "endian.h" +#include "tcp.h" +#include "nodemanager.h" +#include "heartbeat.h" +#include "masklog.h" +#include "sys.h" +#include "ver.h" + +/* for now we operate under the assertion that there can be only one + * cluster active at a time. Changing this will require trickling + * cluster references throughout where nodes are looked up */ +static struct o2nm_cluster *o2nm_single_cluster = NULL; + +#define OCFS2_MAX_HB_CTL_PATH 256 +static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; + +static ctl_table ocfs2_nm_table[] = { + { + .ctl_name = 1, + .procname = "hb_ctl_path", + .data = ocfs2_hb_ctl_path, + .maxlen = OCFS2_MAX_HB_CTL_PATH, + .mode = 0644, + .proc_handler = &proc_dostring, + .strategy = &sysctl_string, + }, + { .ctl_name = 0 } +}; + +static ctl_table ocfs2_mod_table[] = { + { + .ctl_name = KERN_OCFS2_NM, + .procname = "nm", + .data = NULL, + .maxlen = 0, + .mode = 0555, + .child = ocfs2_nm_table + }, + { .ctl_name = 0} +}; + +static ctl_table ocfs2_kern_table[] = { + { + .ctl_name = KERN_OCFS2, + .procname = "ocfs2", + .data = NULL, + .maxlen = 0, + .mode = 0555, + .child = ocfs2_mod_table + }, + { .ctl_name = 0} +}; + +static ctl_table ocfs2_root_table[] = { + { + .ctl_name = CTL_FS, + .procname = "fs", + .data = NULL, + .maxlen = 0, + .mode = 0555, + .child = ocfs2_kern_table + }, + { .ctl_name = 0 } +}; + +static struct ctl_table_header *ocfs2_table_header = NULL; + +const char *o2nm_get_hb_ctl_path(void) +{ + return ocfs2_hb_ctl_path; +} +EXPORT_SYMBOL_GPL(o2nm_get_hb_ctl_path); + +struct o2nm_cluster { + struct config_group cl_group; + unsigned cl_has_local:1; + u8 cl_local_node; + rwlock_t cl_nodes_lock; + struct o2nm_node *cl_nodes[O2NM_MAX_NODES]; + struct rb_root cl_node_ip_tree; + /* this bitmap is part of a hack for disk bitmap.. will go eventually. - zab */ + unsigned long cl_nodes_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; +}; + +struct o2nm_node *o2nm_get_node_by_num(u8 node_num) +{ + struct o2nm_node *node = NULL; + + if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL) + goto out; + + read_lock(&o2nm_single_cluster->cl_nodes_lock); + node = o2nm_single_cluster->cl_nodes[node_num]; + if (node) + config_item_get(&node->nd_item); + read_unlock(&o2nm_single_cluster->cl_nodes_lock); +out: + return node; +} +EXPORT_SYMBOL_GPL(o2nm_get_node_by_num); + +int o2nm_configured_node_map(unsigned long *map, unsigned bytes) +{ + struct o2nm_cluster *cluster = o2nm_single_cluster; + + BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap))); + + if (cluster == NULL) + return -EINVAL; + + read_lock(&cluster->cl_nodes_lock); + memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap)); + read_unlock(&cluster->cl_nodes_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(o2nm_configured_node_map); + +static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster, + __be32 ip_needle, + struct rb_node ***ret_p, + struct rb_node **ret_parent) +{ + struct rb_node **p = &cluster->cl_node_ip_tree.rb_node; + struct rb_node *parent = NULL; + struct o2nm_node *node, *ret = NULL; + + while (*p) { + parent = *p; + node = rb_entry(parent, struct o2nm_node, nd_ip_node); + + if (memcmp(&ip_needle, &node->nd_ipv4_address, + sizeof(ip_needle)) < 0) + p = &(*p)->rb_left; + else if (memcmp(&ip_needle, &node->nd_ipv4_address, + sizeof(ip_needle)) > 0) + p = &(*p)->rb_right; + else { + ret = node; + break; + } + } + + if (ret_p != NULL) + *ret_p = p; + if (ret_parent != NULL) + *ret_parent = parent; + + return ret; +} + +struct o2nm_node *o2nm_get_node_by_ip(__be32 addr) +{ + struct o2nm_node *node = NULL; + struct o2nm_cluster *cluster = o2nm_single_cluster; + + if (cluster == NULL) + goto out; + + read_lock(&cluster->cl_nodes_lock); + node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL); + if (node) + config_item_get(&node->nd_item); + read_unlock(&cluster->cl_nodes_lock); + +out: + return node; +} +EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip); + +void o2nm_node_put(struct o2nm_node *node) +{ + config_item_put(&node->nd_item); +} +EXPORT_SYMBOL_GPL(o2nm_node_put); + +void o2nm_node_get(struct o2nm_node *node) +{ + config_item_get(&node->nd_item); +} +EXPORT_SYMBOL_GPL(o2nm_node_get); + +u8 o2nm_this_node(void) +{ + u8 node_num = O2NM_MAX_NODES; + + if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local) + node_num = o2nm_single_cluster->cl_local_node; + + return node_num; +} +EXPORT_SYMBOL_GPL(o2nm_this_node); + +/* node configfs bits */ + +static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item) +{ + return item ? + container_of(to_config_group(item), struct o2nm_cluster, + cl_group) + : NULL; +} + +static struct o2nm_node *to_o2nm_node(struct config_item *item) +{ + return item ? container_of(item, struct o2nm_node, nd_item) : NULL; +} + +static void o2nm_node_release(struct config_item *item) +{ + struct o2nm_node *node = to_o2nm_node(item); + kfree(node); +} + +static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page) +{ + return sprintf(page, "%d\n", node->nd_num); +} + +static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node) +{ + /* through the first node_set .parent + * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */ + return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent); +} + +enum { + O2NM_NODE_ATTR_NUM = 0, + O2NM_NODE_ATTR_PORT, + O2NM_NODE_ATTR_ADDRESS, + O2NM_NODE_ATTR_LOCAL, +}; + +static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page, + size_t count) +{ + struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node); + unsigned long tmp; + char *p = (char *)page; + + tmp = simple_strtoul(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + if (tmp >= O2NM_MAX_NODES) + return -ERANGE; + + /* once we're in the cl_nodes tree networking can look us up by + * node number and try to use our address and port attributes + * to connect to this node.. make sure that they've been set + * before writing the node attribute? */ + if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || + !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) + return -EINVAL; /* XXX */ + + write_lock(&cluster->cl_nodes_lock); + if (cluster->cl_nodes[tmp]) + p = NULL; + else { + cluster->cl_nodes[tmp] = node; + node->nd_num = tmp; + set_bit(tmp, cluster->cl_nodes_bitmap); + } + write_unlock(&cluster->cl_nodes_lock); + if (p == NULL) + return -EEXIST; + + return count; +} +static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page) +{ + return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port)); +} + +static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node, + const char *page, size_t count) +{ + unsigned long tmp; + char *p = (char *)page; + + tmp = simple_strtoul(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + if (tmp == 0) + return -EINVAL; + if (tmp >= (u16)-1) + return -ERANGE; + + node->nd_ipv4_port = htons(tmp); + + return count; +} + +static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page) +{ + return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address)); +} + +static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node, + const char *page, + size_t count) +{ + struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node); + int ret, i; + struct rb_node **p, *parent; + unsigned int octets[4]; + __be32 ipv4_addr = 0; + + ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2], + &octets[1], &octets[0]); + if (ret != 4) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(octets); i++) { + if (octets[i] > 255) + return -ERANGE; + be32_add_cpu(&ipv4_addr, octets[i] << (i * 8)); + } + + ret = 0; + write_lock(&cluster->cl_nodes_lock); + if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent)) + ret = -EEXIST; + else { + rb_link_node(&node->nd_ip_node, parent, p); + rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree); + } + write_unlock(&cluster->cl_nodes_lock); + if (ret) + return ret; + + memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr)); + + return count; +} + +static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page) +{ + return sprintf(page, "%d\n", node->nd_local); +} + +static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page, + size_t count) +{ + struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node); + unsigned long tmp; + char *p = (char *)page; + ssize_t ret; + + tmp = simple_strtoul(p, &p, 0); + if (!p || (*p && (*p != '\n'))) + return -EINVAL; + + tmp = !!tmp; /* boolean of whether this node wants to be local */ + + /* setting local turns on networking rx for now so we require having + * set everything else first */ + if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || + !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) || + !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) + return -EINVAL; /* XXX */ + + /* the only failure case is trying to set a new local node + * when a different one is already set */ + if (tmp && tmp == cluster->cl_has_local && + cluster->cl_local_node != node->nd_num) + return -EBUSY; + + /* bring up the rx thread if we're setting the new local node. */ + if (tmp && !cluster->cl_has_local) { + ret = o2net_start_listening(node); + if (ret) + return ret; + } + + if (!tmp && cluster->cl_has_local && + cluster->cl_local_node == node->nd_num) { + o2net_stop_listening(node); + cluster->cl_local_node = O2NM_INVALID_NODE_NUM; + } + + node->nd_local = tmp; + if (node->nd_local) { + cluster->cl_has_local = tmp; + cluster->cl_local_node = node->nd_num; + } + + return count; +} + +struct o2nm_node_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct o2nm_node *, char *); + ssize_t (*store)(struct o2nm_node *, const char *, size_t); +}; + +static struct o2nm_node_attribute o2nm_node_attr_num = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "num", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2nm_node_num_read, + .store = o2nm_node_num_write, +}; + +static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "ipv4_port", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2nm_node_ipv4_port_read, + .store = o2nm_node_ipv4_port_write, +}; + +static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "ipv4_address", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2nm_node_ipv4_address_read, + .store = o2nm_node_ipv4_address_write, +}; + +static struct o2nm_node_attribute o2nm_node_attr_local = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "local", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2nm_node_local_read, + .store = o2nm_node_local_write, +}; + +static struct configfs_attribute *o2nm_node_attrs[] = { + [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr, + [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr, + [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr, + [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr, + NULL, +}; + +static int o2nm_attr_index(struct configfs_attribute *attr) +{ + int i; + for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) { + if (attr == o2nm_node_attrs[i]) + return i; + } + BUG(); + return 0; +} + +static ssize_t o2nm_node_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct o2nm_node *node = to_o2nm_node(item); + struct o2nm_node_attribute *o2nm_node_attr = + container_of(attr, struct o2nm_node_attribute, attr); + ssize_t ret = 0; + + if (o2nm_node_attr->show) + ret = o2nm_node_attr->show(node, page); + return ret; +} + +static ssize_t o2nm_node_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct o2nm_node *node = to_o2nm_node(item); + struct o2nm_node_attribute *o2nm_node_attr = + container_of(attr, struct o2nm_node_attribute, attr); + ssize_t ret; + int attr_index = o2nm_attr_index(attr); + + if (o2nm_node_attr->store == NULL) { + ret = -EINVAL; + goto out; + } + + if (test_bit(attr_index, &node->nd_set_attributes)) + return -EBUSY; + + ret = o2nm_node_attr->store(node, page, count); + if (ret < count) + goto out; + + set_bit(attr_index, &node->nd_set_attributes); +out: + return ret; +} + +static struct configfs_item_operations o2nm_node_item_ops = { + .release = o2nm_node_release, + .show_attribute = o2nm_node_show, + .store_attribute = o2nm_node_store, +}; + +static struct config_item_type o2nm_node_type = { + .ct_item_ops = &o2nm_node_item_ops, + .ct_attrs = o2nm_node_attrs, + .ct_owner = THIS_MODULE, +}; + +/* node set */ + +struct o2nm_node_group { + struct config_group ns_group; + /* some stuff? */ +}; + +#if 0 +static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group) +{ + return group ? + container_of(group, struct o2nm_node_group, ns_group) + : NULL; +} +#endif + +static struct config_item *o2nm_node_group_make_item(struct config_group *group, + const char *name) +{ + struct o2nm_node *node = NULL; + struct config_item *ret = NULL; + + if (strlen(name) > O2NM_MAX_NAME_LEN) + goto out; /* ENAMETOOLONG */ + + node = kcalloc(1, sizeof(struct o2nm_node), GFP_KERNEL); + if (node == NULL) + goto out; /* ENOMEM */ + + strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */ + config_item_init_type_name(&node->nd_item, name, &o2nm_node_type); + spin_lock_init(&node->nd_lock); + + ret = &node->nd_item; + +out: + if (ret == NULL) + kfree(node); + + return ret; +} + +static void o2nm_node_group_drop_item(struct config_group *group, + struct config_item *item) +{ + struct o2nm_node *node = to_o2nm_node(item); + struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent); + + o2net_disconnect_node(node); + + if (cluster->cl_has_local && + (cluster->cl_local_node == node->nd_num)) { + cluster->cl_has_local = 0; + cluster->cl_local_node = O2NM_INVALID_NODE_NUM; + o2net_stop_listening(node); + } + + /* XXX call into net to stop this node from trading messages */ + + write_lock(&cluster->cl_nodes_lock); + + /* XXX sloppy */ + if (node->nd_ipv4_address) + rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree); + + /* nd_num might be 0 if the node number hasn't been set.. */ + if (cluster->cl_nodes[node->nd_num] == node) { + cluster->cl_nodes[node->nd_num] = NULL; + clear_bit(node->nd_num, cluster->cl_nodes_bitmap); + } + write_unlock(&cluster->cl_nodes_lock); + + config_item_put(item); +} + +static struct configfs_group_operations o2nm_node_group_group_ops = { + .make_item = o2nm_node_group_make_item, + .drop_item = o2nm_node_group_drop_item, +}; + +static struct config_item_type o2nm_node_group_type = { + .ct_group_ops = &o2nm_node_group_group_ops, + .ct_owner = THIS_MODULE, +}; + +/* cluster */ + +static void o2nm_cluster_release(struct config_item *item) +{ + struct o2nm_cluster *cluster = to_o2nm_cluster(item); + + kfree(cluster->cl_group.default_groups); + kfree(cluster); +} + +static struct configfs_item_operations o2nm_cluster_item_ops = { + .release = o2nm_cluster_release, +}; + +static struct config_item_type o2nm_cluster_type = { + .ct_item_ops = &o2nm_cluster_item_ops, + .ct_owner = THIS_MODULE, +}; + +/* cluster set */ + +struct o2nm_cluster_group { + struct configfs_subsystem cs_subsys; + /* some stuff? */ +}; + +#if 0 +static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group) +{ + return group ? + container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys) + : NULL; +} +#endif + +static struct config_group *o2nm_cluster_group_make_group(struct config_group *group, + const char *name) +{ + struct o2nm_cluster *cluster = NULL; + struct o2nm_node_group *ns = NULL; + struct config_group *o2hb_group = NULL, *ret = NULL; + void *defs = NULL; + + /* this runs under the parent dir's i_sem; there can be only + * one caller in here at a time */ + if (o2nm_single_cluster) + goto out; /* ENOSPC */ + + cluster = kcalloc(1, sizeof(struct o2nm_cluster), GFP_KERNEL); + ns = kcalloc(1, sizeof(struct o2nm_node_group), GFP_KERNEL); + defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL); + o2hb_group = o2hb_alloc_hb_set(); + if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL) + goto out; + + config_group_init_type_name(&cluster->cl_group, name, + &o2nm_cluster_type); + config_group_init_type_name(&ns->ns_group, "node", + &o2nm_node_group_type); + + cluster->cl_group.default_groups = defs; + cluster->cl_group.default_groups[0] = &ns->ns_group; + cluster->cl_group.default_groups[1] = o2hb_group; + cluster->cl_group.default_groups[2] = NULL; + rwlock_init(&cluster->cl_nodes_lock); + cluster->cl_node_ip_tree = RB_ROOT; + + ret = &cluster->cl_group; + o2nm_single_cluster = cluster; + +out: + if (ret == NULL) { + kfree(cluster); + kfree(ns); + o2hb_free_hb_set(o2hb_group); + kfree(defs); + } + + return ret; +} + +static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item) +{ + struct o2nm_cluster *cluster = to_o2nm_cluster(item); + int i; + struct config_item *killme; + + BUG_ON(o2nm_single_cluster != cluster); + o2nm_single_cluster = NULL; + + for (i = 0; cluster->cl_group.default_groups[i]; i++) { + killme = &cluster->cl_group.default_groups[i]->cg_item; + cluster->cl_group.default_groups[i] = NULL; + config_item_put(killme); + } + + config_item_put(item); +} + +static struct configfs_group_operations o2nm_cluster_group_group_ops = { + .make_group = o2nm_cluster_group_make_group, + .drop_item = o2nm_cluster_group_drop_item, +}; + +static struct config_item_type o2nm_cluster_group_type = { + .ct_group_ops = &o2nm_cluster_group_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct o2nm_cluster_group o2nm_cluster_group = { + .cs_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "cluster", + .ci_type = &o2nm_cluster_group_type, + }, + }, + }, +}; + +static void __exit exit_o2nm(void) +{ + if (ocfs2_table_header) + unregister_sysctl_table(ocfs2_table_header); + + /* XXX sync with hb callbacks and shut down hb? */ + o2net_unregister_hb_callbacks(); + configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys); + o2cb_sys_shutdown(); + + o2net_exit(); +} + +static int __init init_o2nm(void) +{ + int ret = -1; + + cluster_print_version(); + + o2hb_init(); + o2net_init(); + + ocfs2_table_header = register_sysctl_table(ocfs2_root_table, 0); + if (!ocfs2_table_header) { + printk(KERN_ERR "nodemanager: unable to register sysctl\n"); + ret = -ENOMEM; /* or something. */ + goto out; + } + + ret = o2net_register_hb_callbacks(); + if (ret) + goto out_sysctl; + + config_group_init(&o2nm_cluster_group.cs_subsys.su_group); + init_MUTEX(&o2nm_cluster_group.cs_subsys.su_sem); + ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys); + if (ret) { + printk(KERN_ERR "nodemanager: Registration returned %d\n", ret); + goto out_callbacks; + } + + ret = o2cb_sys_init(); + if (!ret) + goto out; + + configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys); +out_callbacks: + o2net_unregister_hb_callbacks(); +out_sysctl: + unregister_sysctl_table(ocfs2_table_header); +out: + return ret; +} + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); + +module_init(init_o2nm) +module_exit(exit_o2nm) diff --git a/fs/ocfs2/cluster/nodemanager.h b/fs/ocfs2/cluster/nodemanager.h new file mode 100644 index 0000000..fce8033 --- /dev/null +++ b/fs/ocfs2/cluster/nodemanager.h @@ -0,0 +1,64 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * nodemanager.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef O2CLUSTER_NODEMANAGER_H +#define O2CLUSTER_NODEMANAGER_H + +#include "ocfs2_nodemanager.h" + +/* This totally doesn't belong here. */ +#include <linux/configfs.h> +#include <linux/rbtree.h> + +#define KERN_OCFS2 988 +#define KERN_OCFS2_NM 1 + +const char *o2nm_get_hb_ctl_path(void); + +struct o2nm_node { + spinlock_t nd_lock; + struct config_item nd_item; + char nd_name[O2NM_MAX_NAME_LEN+1]; /* replace? */ + __u8 nd_num; + /* only one address per node, as attributes, for now. */ + __be32 nd_ipv4_address; + __be16 nd_ipv4_port; + struct rb_node nd_ip_node; + /* there can be only one local node for now */ + int nd_local; + + unsigned long nd_set_attributes; +}; + +u8 o2nm_this_node(void); + +int o2nm_configured_node_map(unsigned long *map, unsigned bytes); +struct o2nm_node *o2nm_get_node_by_num(u8 node_num); +struct o2nm_node *o2nm_get_node_by_ip(__be32 addr); +void o2nm_node_get(struct o2nm_node *node); +void o2nm_node_put(struct o2nm_node *node); + +#endif /* O2CLUSTER_NODEMANAGER_H */ diff --git a/fs/ocfs2/cluster/ocfs2_heartbeat.h b/fs/ocfs2/cluster/ocfs2_heartbeat.h new file mode 100644 index 0000000..9409606 --- /dev/null +++ b/fs/ocfs2/cluster/ocfs2_heartbeat.h @@ -0,0 +1,37 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2_heartbeat.h + * + * On-disk structures for ocfs2_heartbeat + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _OCFS2_HEARTBEAT_H +#define _OCFS2_HEARTBEAT_H + +struct o2hb_disk_heartbeat_block { + __le64 hb_seq; + __u8 hb_node; + __u8 hb_pad1[3]; + __le32 hb_cksum; + __le64 hb_generation; +}; + +#endif /* _OCFS2_HEARTBEAT_H */ diff --git a/fs/ocfs2/cluster/ocfs2_nodemanager.h b/fs/ocfs2/cluster/ocfs2_nodemanager.h new file mode 100644 index 0000000..5b9854b --- /dev/null +++ b/fs/ocfs2/cluster/ocfs2_nodemanager.h @@ -0,0 +1,39 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2_nodemanager.h + * + * Header describing the interface between userspace and the kernel + * for the ocfs2_nodemanager module. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef _OCFS2_NODEMANAGER_H +#define _OCFS2_NODEMANAGER_H + +#define O2NM_API_VERSION 5 + +#define O2NM_MAX_NODES 255 +#define O2NM_INVALID_NODE_NUM 255 + +/* host name, group name, cluster name all 64 bytes */ +#define O2NM_MAX_NAME_LEN 64 // __NEW_UTS_LEN + +#endif /* _OCFS2_NODEMANAGER_H */ diff --git a/fs/ocfs2/cluster/quorum.c b/fs/ocfs2/cluster/quorum.c new file mode 100644 index 0000000..7bba98f --- /dev/null +++ b/fs/ocfs2/cluster/quorum.c @@ -0,0 +1,315 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +/* This quorum hack is only here until we transition to some more rational + * approach that is driven from userspace. Honest. No foolin'. + * + * Imagine two nodes lose network connectivity to each other but they're still + * up and operating in every other way. Presumably a network timeout indicates + * that a node is broken and should be recovered. They can't both recover each + * other and both carry on without serialising their access to the file system. + * They need to decide who is authoritative. Now extend that problem to + * arbitrary groups of nodes losing connectivity between each other. + * + * So we declare that a node which has given up on connecting to a majority + * of nodes who are still heartbeating will fence itself. + * + * There are huge opportunities for races here. After we give up on a node's + * connection we need to wait long enough to give heartbeat an opportunity + * to declare the node as truly dead. We also need to be careful with the + * race between when we see a node start heartbeating and when we connect + * to it. + * + * So nodes that are in this transtion put a hold on the quorum decision + * with a counter. As they fall out of this transition they drop the count + * and if they're the last, they fire off the decision. + */ +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +#include "heartbeat.h" +#include "nodemanager.h" +#define MLOG_MASK_PREFIX ML_QUORUM +#include "masklog.h" +#include "quorum.h" + +static struct o2quo_state { + spinlock_t qs_lock; + struct work_struct qs_work; + int qs_pending; + int qs_heartbeating; + unsigned long qs_hb_bm[BITS_TO_LONGS(O2NM_MAX_NODES)]; + int qs_connected; + unsigned long qs_conn_bm[BITS_TO_LONGS(O2NM_MAX_NODES)]; + int qs_holds; + unsigned long qs_hold_bm[BITS_TO_LONGS(O2NM_MAX_NODES)]; +} o2quo_state; + +/* this is horribly heavy-handed. It should instead flip the file + * system RO and call some userspace script. */ +static void o2quo_fence_self(void) +{ + /* panic spins with interrupts enabled. with preempt + * threads can still schedule, etc, etc */ + o2hb_stop_all_regions(); + panic("ocfs2 is very sorry to be fencing this system by panicing\n"); +} + +/* Indicate that a timeout occured on a hearbeat region write. The + * other nodes in the cluster may consider us dead at that time so we + * want to "fence" ourselves so that we don't scribble on the disk + * after they think they've recovered us. This can't solve all + * problems related to writeout after recovery but this hack can at + * least close some of those gaps. When we have real fencing, this can + * go away as our node would be fenced externally before other nodes + * begin recovery. */ +void o2quo_disk_timeout(void) +{ + o2quo_fence_self(); +} + +static void o2quo_make_decision(void *arg) +{ + int quorum; + int lowest_hb, lowest_reachable = 0, fence = 0; + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + lowest_hb = find_first_bit(qs->qs_hb_bm, O2NM_MAX_NODES); + if (lowest_hb != O2NM_MAX_NODES) + lowest_reachable = test_bit(lowest_hb, qs->qs_conn_bm); + + mlog(0, "heartbeating: %d, connected: %d, " + "lowest: %d (%sreachable)\n", qs->qs_heartbeating, + qs->qs_connected, lowest_hb, lowest_reachable ? "" : "un"); + + if (!test_bit(o2nm_this_node(), qs->qs_hb_bm) || + qs->qs_heartbeating == 1) + goto out; + + if (qs->qs_heartbeating & 1) { + /* the odd numbered cluster case is straight forward -- + * if we can't talk to the majority we're hosed */ + quorum = (qs->qs_heartbeating + 1)/2; + if (qs->qs_connected < quorum) { + mlog(ML_ERROR, "fencing this node because it is " + "only connected to %u nodes and %u is needed " + "to make a quorum out of %u heartbeating nodes\n", + qs->qs_connected, quorum, + qs->qs_heartbeating); + fence = 1; + } + } else { + /* the even numbered cluster adds the possibility of each half + * of the cluster being able to talk amongst themselves.. in + * that case we're hosed if we can't talk to the group that has + * the lowest numbered node */ + quorum = qs->qs_heartbeating / 2; + if (qs->qs_connected < quorum) { + mlog(ML_ERROR, "fencing this node because it is " + "only connected to %u nodes and %u is needed " + "to make a quorum out of %u heartbeating nodes\n", + qs->qs_connected, quorum, + qs->qs_heartbeating); + fence = 1; + } + else if ((qs->qs_connected == quorum) && + !lowest_reachable) { + mlog(ML_ERROR, "fencing this node because it is " + "connected to a half-quorum of %u out of %u " + "nodes which doesn't include the lowest active " + "node %u\n", quorum, qs->qs_heartbeating, + lowest_hb); + fence = 1; + } + } + +out: + spin_unlock(&qs->qs_lock); + if (fence) + o2quo_fence_self(); +} + +static void o2quo_set_hold(struct o2quo_state *qs, u8 node) +{ + assert_spin_locked(&qs->qs_lock); + + if (!test_and_set_bit(node, qs->qs_hold_bm)) { + qs->qs_holds++; + mlog_bug_on_msg(qs->qs_holds == O2NM_MAX_NODES, + "node %u\n", node); + mlog(0, "node %u, %d total\n", node, qs->qs_holds); + } +} + +static void o2quo_clear_hold(struct o2quo_state *qs, u8 node) +{ + assert_spin_locked(&qs->qs_lock); + + if (test_and_clear_bit(node, qs->qs_hold_bm)) { + mlog(0, "node %u, %d total\n", node, qs->qs_holds - 1); + if (--qs->qs_holds == 0) { + if (qs->qs_pending) { + qs->qs_pending = 0; + schedule_work(&qs->qs_work); + } + } + mlog_bug_on_msg(qs->qs_holds < 0, "node %u, holds %d\n", + node, qs->qs_holds); + } +} + +/* as a node comes up we delay the quorum decision until we know the fate of + * the connection. the hold will be droped in conn_up or hb_down. it might be + * perpetuated by con_err until hb_down. if we already have a conn, we might + * be dropping a hold that conn_up got. */ +void o2quo_hb_up(u8 node) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + qs->qs_heartbeating++; + mlog_bug_on_msg(qs->qs_heartbeating == O2NM_MAX_NODES, + "node %u\n", node); + mlog_bug_on_msg(test_bit(node, qs->qs_hb_bm), "node %u\n", node); + set_bit(node, qs->qs_hb_bm); + + mlog(0, "node %u, %d total\n", node, qs->qs_heartbeating); + + if (!test_bit(node, qs->qs_conn_bm)) + o2quo_set_hold(qs, node); + else + o2quo_clear_hold(qs, node); + + spin_unlock(&qs->qs_lock); +} + +/* hb going down releases any holds we might have had due to this node from + * conn_up, conn_err, or hb_up */ +void o2quo_hb_down(u8 node) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + qs->qs_heartbeating--; + mlog_bug_on_msg(qs->qs_heartbeating < 0, + "node %u, %d heartbeating\n", + node, qs->qs_heartbeating); + mlog_bug_on_msg(!test_bit(node, qs->qs_hb_bm), "node %u\n", node); + clear_bit(node, qs->qs_hb_bm); + + mlog(0, "node %u, %d total\n", node, qs->qs_heartbeating); + + o2quo_clear_hold(qs, node); + + spin_unlock(&qs->qs_lock); +} + +/* this tells us that we've decided that the node is still heartbeating + * even though we've lost it's conn. it must only be called after conn_err + * and indicates that we must now make a quorum decision in the future, + * though we might be doing so after waiting for holds to drain. Here + * we'll be dropping the hold from conn_err. */ +void o2quo_hb_still_up(u8 node) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + mlog(0, "node %u\n", node); + + qs->qs_pending = 1; + o2quo_clear_hold(qs, node); + + spin_unlock(&qs->qs_lock); +} + +/* This is analagous to hb_up. as a node's connection comes up we delay the + * quorum decision until we see it heartbeating. the hold will be droped in + * hb_up or hb_down. it might be perpetuated by con_err until hb_down. if + * it's already heartbeating we we might be dropping a hold that conn_up got. + * */ +void o2quo_conn_up(u8 node) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + qs->qs_connected++; + mlog_bug_on_msg(qs->qs_connected == O2NM_MAX_NODES, + "node %u\n", node); + mlog_bug_on_msg(test_bit(node, qs->qs_conn_bm), "node %u\n", node); + set_bit(node, qs->qs_conn_bm); + + mlog(0, "node %u, %d total\n", node, qs->qs_connected); + + if (!test_bit(node, qs->qs_hb_bm)) + o2quo_set_hold(qs, node); + else + o2quo_clear_hold(qs, node); + + spin_unlock(&qs->qs_lock); +} + +/* we've decided that we won't ever be connecting to the node again. if it's + * still heartbeating we grab a hold that will delay decisions until either the + * node stops heartbeating from hb_down or the caller decides that the node is + * still up and calls still_up */ +void o2quo_conn_err(u8 node) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock(&qs->qs_lock); + + if (test_bit(node, qs->qs_conn_bm)) { + qs->qs_connected--; + mlog_bug_on_msg(qs->qs_connected < 0, + "node %u, connected %d\n", + node, qs->qs_connected); + + clear_bit(node, qs->qs_conn_bm); + } + + mlog(0, "node %u, %d total\n", node, qs->qs_connected); + + if (test_bit(node, qs->qs_hb_bm)) + o2quo_set_hold(qs, node); + + spin_unlock(&qs->qs_lock); +} + +void o2quo_init(void) +{ + struct o2quo_state *qs = &o2quo_state; + + spin_lock_init(&qs->qs_lock); + INIT_WORK(&qs->qs_work, o2quo_make_decision, NULL); +} + +void o2quo_exit(void) +{ + flush_scheduled_work(); +} diff --git a/fs/ocfs2/cluster/quorum.h b/fs/ocfs2/cluster/quorum.h new file mode 100644 index 0000000..6649cc6 --- /dev/null +++ b/fs/ocfs2/cluster/quorum.h @@ -0,0 +1,36 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef O2CLUSTER_QUORUM_H +#define O2CLUSTER_QUORUM_H + +void o2quo_init(void); +void o2quo_exit(void); + +void o2quo_hb_up(u8 node); +void o2quo_hb_down(u8 node); +void o2quo_hb_still_up(u8 node); +void o2quo_conn_up(u8 node); +void o2quo_conn_err(u8 node); +void o2quo_disk_timeout(void); + +#endif /* O2CLUSTER_QUORUM_H */ diff --git a/fs/ocfs2/cluster/sys.c b/fs/ocfs2/cluster/sys.c new file mode 100644 index 0000000..1d9f6ac --- /dev/null +++ b/fs/ocfs2/cluster/sys.c @@ -0,0 +1,124 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * sys.c + * + * OCFS2 cluster sysfs interface + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation, + * version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> + +#include "ocfs2_nodemanager.h" +#include "masklog.h" +#include "sys.h" + +struct o2cb_attribute { + struct attribute attr; + ssize_t (*show)(char *buf); + ssize_t (*store)(const char *buf, size_t count); +}; + +#define O2CB_ATTR(_name, _mode, _show, _store) \ +struct o2cb_attribute o2cb_attr_##_name = __ATTR(_name, _mode, _show, _store) + +#define to_o2cb_subsys(k) container_of(to_kset(k), struct subsystem, kset) +#define to_o2cb_attr(_attr) container_of(_attr, struct o2cb_attribute, attr) + +static ssize_t o2cb_interface_revision_show(char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION); +} + +static O2CB_ATTR(interface_revision, S_IFREG | S_IRUGO, o2cb_interface_revision_show, NULL); + +static struct attribute *o2cb_attrs[] = { + &o2cb_attr_interface_revision.attr, + NULL, +}; + +static ssize_t +o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer); +static ssize_t +o2cb_store(struct kobject * kobj, struct attribute * attr, + const char * buffer, size_t count); +static struct sysfs_ops o2cb_sysfs_ops = { + .show = o2cb_show, + .store = o2cb_store, +}; + +static struct kobj_type o2cb_subsys_type = { + .default_attrs = o2cb_attrs, + .sysfs_ops = &o2cb_sysfs_ops, +}; + +/* gives us o2cb_subsys */ +static decl_subsys(o2cb, NULL, NULL); + +static ssize_t +o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer) +{ + struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); + struct subsystem *sbs = to_o2cb_subsys(kobj); + + BUG_ON(sbs != &o2cb_subsys); + + if (o2cb_attr->show) + return o2cb_attr->show(buffer); + return -EIO; +} + +static ssize_t +o2cb_store(struct kobject * kobj, struct attribute * attr, + const char * buffer, size_t count) +{ + struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); + struct subsystem *sbs = to_o2cb_subsys(kobj); + + BUG_ON(sbs != &o2cb_subsys); + + if (o2cb_attr->store) + return o2cb_attr->store(buffer, count); + return -EIO; +} + +void o2cb_sys_shutdown(void) +{ + mlog_sys_shutdown(); + subsystem_unregister(&o2cb_subsys); +} + +int o2cb_sys_init(void) +{ + int ret; + + o2cb_subsys.kset.kobj.ktype = &o2cb_subsys_type; + ret = subsystem_register(&o2cb_subsys); + if (ret) + return ret; + + ret = mlog_sys_init(&o2cb_subsys); + if (ret) + subsystem_unregister(&o2cb_subsys); + return ret; +} diff --git a/fs/ocfs2/cluster/sys.h b/fs/ocfs2/cluster/sys.h new file mode 100644 index 0000000..d66b8ab --- /dev/null +++ b/fs/ocfs2/cluster/sys.h @@ -0,0 +1,33 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * sys.h + * + * Function prototypes for o2cb sysfs interface + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation, + * version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef O2CLUSTER_SYS_H +#define O2CLUSTER_SYS_H + +void o2cb_sys_shutdown(void); +int o2cb_sys_init(void); + +#endif /* O2CLUSTER_SYS_H */ diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c new file mode 100644 index 0000000..35d92c0 --- /dev/null +++ b/fs/ocfs2/cluster/tcp.c @@ -0,0 +1,1829 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * ---- + * + * Callers for this were originally written against a very simple synchronus + * API. This implementation reflects those simple callers. Some day I'm sure + * we'll need to move to a more robust posting/callback mechanism. + * + * Transmit calls pass in kernel virtual addresses and block copying this into + * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting + * for a failed socket to timeout. TX callers can also pass in a poniter to an + * 'int' which gets filled with an errno off the wire in response to the + * message they send. + * + * Handlers for unsolicited messages are registered. Each socket has a page + * that incoming data is copied into. First the header, then the data. + * Handlers are called from only one thread with a reference to this per-socket + * page. This page is destroyed after the handler call, so it can't be + * referenced beyond the call. Handlers may block but are discouraged from + * doing so. + * + * Any framing errors (bad magic, large payload lengths) close a connection. + * + * Our sock_container holds the state we associate with a socket. It's current + * framing state is held there as well as the refcounting we do around when it + * is safe to tear down the socket. The socket is only finally torn down from + * the container when the container loses all of its references -- so as long + * as you hold a ref on the container you can trust that the socket is valid + * for use with kernel socket APIs. + * + * Connections are initiated between a pair of nodes when the node with the + * higher node number gets a heartbeat callback which indicates that the lower + * numbered node has started heartbeating. The lower numbered node is passive + * and only accepts the connection if the higher numbered node is heartbeating. + */ + +#include <linux/kernel.h> +#include <linux/jiffies.h> +#include <linux/slab.h> +#include <linux/idr.h> +#include <linux/kref.h> +#include <net/tcp.h> + +#include <asm/uaccess.h> + +#include "heartbeat.h" +#include "tcp.h" +#include "nodemanager.h" +#define MLOG_MASK_PREFIX ML_TCP +#include "masklog.h" +#include "quorum.h" + +#include "tcp_internal.h" + +/* + * The linux network stack isn't sparse endian clean.. It has macros like + * ntohs() which perform the endian checks and structs like sockaddr_in + * which aren't annotated. So __force is found here to get the build + * clean. When they emerge from the dark ages and annotate the code + * we can remove these. + */ + +#define SC_NODEF_FMT "node %s (num %u) at %u.%u.%u.%u:%u" +#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ + NIPQUAD(sc->sc_node->nd_ipv4_address), \ + ntohs(sc->sc_node->nd_ipv4_port) + +/* + * In the following two log macros, the whitespace after the ',' just + * before ##args is intentional. Otherwise, gcc 2.95 will eat the + * previous token if args expands to nothing. + */ +#define msglog(hdr, fmt, args...) do { \ + typeof(hdr) __hdr = (hdr); \ + mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ + "key %08x num %u] " fmt, \ + be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ + be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ + be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ + be32_to_cpu(__hdr->msg_num) , ##args); \ +} while (0) + +#define sclog(sc, fmt, args...) do { \ + typeof(sc) __sc = (sc); \ + mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ + "pg_off %zu] " fmt, __sc, \ + atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ + __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ + ##args); \ +} while (0) + +static rwlock_t o2net_handler_lock = RW_LOCK_UNLOCKED; +static struct rb_root o2net_handler_tree = RB_ROOT; + +static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; + +/* XXX someday we'll need better accounting */ +static struct socket *o2net_listen_sock = NULL; + +/* + * listen work is only queued by the listening socket callbacks on the + * o2net_wq. teardown detaches the callbacks before destroying the workqueue. + * quorum work is queued as sock containers are shutdown.. stop_listening + * tears down all the node's sock containers, preventing future shutdowns + * and queued quroum work, before canceling delayed quorum work and + * destroying the work queue. + */ +static struct workqueue_struct *o2net_wq; +static struct work_struct o2net_listen_work; + +static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; +#define O2NET_HB_PRI 0x1 + +static struct o2net_handshake *o2net_hand; +static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; + +static int o2net_sys_err_translations[O2NET_ERR_MAX] = + {[O2NET_ERR_NONE] = 0, + [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, + [O2NET_ERR_OVERFLOW] = -EOVERFLOW, + [O2NET_ERR_DIED] = -EHOSTDOWN,}; + +/* can't quite avoid *all* internal declarations :/ */ +static void o2net_sc_connect_completed(void *arg); +static void o2net_rx_until_empty(void *arg); +static void o2net_shutdown_sc(void *arg); +static void o2net_listen_data_ready(struct sock *sk, int bytes); +static void o2net_sc_send_keep_req(void *arg); +static void o2net_idle_timer(unsigned long data); +static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); + +static inline int o2net_sys_err_to_errno(enum o2net_system_error err) +{ + int trans; + BUG_ON(err >= O2NET_ERR_MAX); + trans = o2net_sys_err_translations[err]; + + /* Just in case we mess up the translation table above */ + BUG_ON(err != O2NET_ERR_NONE && trans == 0); + return trans; +} + +static struct o2net_node * o2net_nn_from_num(u8 node_num) +{ + BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); + return &o2net_nodes[node_num]; +} + +static u8 o2net_num_from_nn(struct o2net_node *nn) +{ + BUG_ON(nn == NULL); + return nn - o2net_nodes; +} + +/* ------------------------------------------------------------ */ + +static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) +{ + int ret = 0; + + do { + if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { + ret = -EAGAIN; + break; + } + spin_lock(&nn->nn_lock); + ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); + if (ret == 0) + list_add_tail(&nsw->ns_node_item, + &nn->nn_status_list); + spin_unlock(&nn->nn_lock); + } while (ret == -EAGAIN); + + if (ret == 0) { + init_waitqueue_head(&nsw->ns_wq); + nsw->ns_sys_status = O2NET_ERR_NONE; + nsw->ns_status = 0; + } + + return ret; +} + +static void o2net_complete_nsw_locked(struct o2net_node *nn, + struct o2net_status_wait *nsw, + enum o2net_system_error sys_status, + s32 status) +{ + assert_spin_locked(&nn->nn_lock); + + if (!list_empty(&nsw->ns_node_item)) { + list_del_init(&nsw->ns_node_item); + nsw->ns_sys_status = sys_status; + nsw->ns_status = status; + idr_remove(&nn->nn_status_idr, nsw->ns_id); + wake_up(&nsw->ns_wq); + } +} + +static void o2net_complete_nsw(struct o2net_node *nn, + struct o2net_status_wait *nsw, + u64 id, enum o2net_system_error sys_status, + s32 status) +{ + spin_lock(&nn->nn_lock); + if (nsw == NULL) { + if (id > INT_MAX) + goto out; + + nsw = idr_find(&nn->nn_status_idr, id); + if (nsw == NULL) + goto out; + } + + o2net_complete_nsw_locked(nn, nsw, sys_status, status); + +out: + spin_unlock(&nn->nn_lock); + return; +} + +static void o2net_complete_nodes_nsw(struct o2net_node *nn) +{ + struct list_head *iter, *tmp; + unsigned int num_kills = 0; + struct o2net_status_wait *nsw; + + assert_spin_locked(&nn->nn_lock); + + list_for_each_safe(iter, tmp, &nn->nn_status_list) { + nsw = list_entry(iter, struct o2net_status_wait, ns_node_item); + o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); + num_kills++; + } + + mlog(0, "completed %d messages for node %u\n", num_kills, + o2net_num_from_nn(nn)); +} + +static int o2net_nsw_completed(struct o2net_node *nn, + struct o2net_status_wait *nsw) +{ + int completed; + spin_lock(&nn->nn_lock); + completed = list_empty(&nsw->ns_node_item); + spin_unlock(&nn->nn_lock); + return completed; +} + +/* ------------------------------------------------------------ */ + +static void sc_kref_release(struct kref *kref) +{ + struct o2net_sock_container *sc = container_of(kref, + struct o2net_sock_container, sc_kref); + sclog(sc, "releasing\n"); + + if (sc->sc_sock) { + sock_release(sc->sc_sock); + sc->sc_sock = NULL; + } + + o2nm_node_put(sc->sc_node); + sc->sc_node = NULL; + + kfree(sc); +} + +static void sc_put(struct o2net_sock_container *sc) +{ + sclog(sc, "put\n"); + kref_put(&sc->sc_kref, sc_kref_release); +} +static void sc_get(struct o2net_sock_container *sc) +{ + sclog(sc, "get\n"); + kref_get(&sc->sc_kref); +} +static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) +{ + struct o2net_sock_container *sc, *ret = NULL; + struct page *page = NULL; + + page = alloc_page(GFP_NOFS); + sc = kcalloc(1, sizeof(*sc), GFP_NOFS); + if (sc == NULL || page == NULL) + goto out; + + kref_init(&sc->sc_kref); + o2nm_node_get(node); + sc->sc_node = node; + + INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed, sc); + INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty, sc); + INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc, sc); + INIT_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req, sc); + + init_timer(&sc->sc_idle_timeout); + sc->sc_idle_timeout.function = o2net_idle_timer; + sc->sc_idle_timeout.data = (unsigned long)sc; + + sclog(sc, "alloced\n"); + + ret = sc; + sc->sc_page = page; + sc = NULL; + page = NULL; + +out: + if (page) + __free_page(page); + kfree(sc); + + return ret; +} + +/* ------------------------------------------------------------ */ + +static void o2net_sc_queue_work(struct o2net_sock_container *sc, + struct work_struct *work) +{ + sc_get(sc); + if (!queue_work(o2net_wq, work)) + sc_put(sc); +} +static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, + struct work_struct *work, + int delay) +{ + sc_get(sc); + if (!queue_delayed_work(o2net_wq, work, delay)) + sc_put(sc); +} +static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, + struct work_struct *work) +{ + if (cancel_delayed_work(work)) + sc_put(sc); +} + +static void o2net_set_nn_state(struct o2net_node *nn, + struct o2net_sock_container *sc, + unsigned valid, int err) +{ + int was_valid = nn->nn_sc_valid; + int was_err = nn->nn_persistent_error; + struct o2net_sock_container *old_sc = nn->nn_sc; + + assert_spin_locked(&nn->nn_lock); + + /* the node num comparison and single connect/accept path should stop + * an non-null sc from being overwritten with another */ + BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); + mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); + mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); + + /* we won't reconnect after our valid conn goes away for + * this hb iteration.. here so it shows up in the logs */ + if (was_valid && !valid && err == 0) + err = -ENOTCONN; + + mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", + o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, + nn->nn_persistent_error, err); + + nn->nn_sc = sc; + nn->nn_sc_valid = valid ? 1 : 0; + nn->nn_persistent_error = err; + + /* mirrors o2net_tx_can_proceed() */ + if (nn->nn_persistent_error || nn->nn_sc_valid) + wake_up(&nn->nn_sc_wq); + + if (!was_err && nn->nn_persistent_error) { + o2quo_conn_err(o2net_num_from_nn(nn)); + queue_delayed_work(o2net_wq, &nn->nn_still_up, + msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); + } + + if (was_valid && !valid) { + mlog(ML_NOTICE, "no longer connected to " SC_NODEF_FMT "\n", + SC_NODEF_ARGS(old_sc)); + o2net_complete_nodes_nsw(nn); + } + + if (!was_valid && valid) { + o2quo_conn_up(o2net_num_from_nn(nn)); + /* this is a bit of a hack. we only try reconnecting + * when heartbeating starts until we get a connection. + * if that connection then dies we don't try reconnecting. + * the only way to start connecting again is to down + * heartbeat and bring it back up. */ + cancel_delayed_work(&nn->nn_connect_expired); + mlog(ML_NOTICE, "%s " SC_NODEF_FMT "\n", + o2nm_this_node() > sc->sc_node->nd_num ? + "connected to" : "accepted connection from", + SC_NODEF_ARGS(sc)); + } + + /* trigger the connecting worker func as long as we're not valid, + * it will back off if it shouldn't connect. This can be called + * from node config teardown and so needs to be careful about + * the work queue actually being up. */ + if (!valid && o2net_wq) { + unsigned long delay; + /* delay if we're withing a RECONNECT_DELAY of the + * last attempt */ + delay = (nn->nn_last_connect_attempt + + msecs_to_jiffies(O2NET_RECONNECT_DELAY_MS)) + - jiffies; + if (delay > msecs_to_jiffies(O2NET_RECONNECT_DELAY_MS)) + delay = 0; + mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); + queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); + } + + /* keep track of the nn's sc ref for the caller */ + if ((old_sc == NULL) && sc) + sc_get(sc); + if (old_sc && (old_sc != sc)) { + o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); + sc_put(old_sc); + } +} + +/* see o2net_register_callbacks() */ +static void o2net_data_ready(struct sock *sk, int bytes) +{ + void (*ready)(struct sock *sk, int bytes); + + read_lock(&sk->sk_callback_lock); + if (sk->sk_user_data) { + struct o2net_sock_container *sc = sk->sk_user_data; + sclog(sc, "data_ready hit\n"); + do_gettimeofday(&sc->sc_tv_data_ready); + o2net_sc_queue_work(sc, &sc->sc_rx_work); + ready = sc->sc_data_ready; + } else { + ready = sk->sk_data_ready; + } + read_unlock(&sk->sk_callback_lock); + + ready(sk, bytes); +} + +/* see o2net_register_callbacks() */ +static void o2net_state_change(struct sock *sk) +{ + void (*state_change)(struct sock *sk); + struct o2net_sock_container *sc; + + read_lock(&sk->sk_callback_lock); + sc = sk->sk_user_data; + if (sc == NULL) { + state_change = sk->sk_state_change; + goto out; + } + + sclog(sc, "state_change to %d\n", sk->sk_state); + + state_change = sc->sc_state_change; + + switch(sk->sk_state) { + /* ignore connecting sockets as they make progress */ + case TCP_SYN_SENT: + case TCP_SYN_RECV: + break; + case TCP_ESTABLISHED: + o2net_sc_queue_work(sc, &sc->sc_connect_work); + break; + default: + o2net_sc_queue_work(sc, &sc->sc_shutdown_work); + break; + } +out: + read_unlock(&sk->sk_callback_lock); + state_change(sk); +} + +/* + * we register callbacks so we can queue work on events before calling + * the original callbacks. our callbacks our careful to test user_data + * to discover when they've reaced with o2net_unregister_callbacks(). + */ +static void o2net_register_callbacks(struct sock *sk, + struct o2net_sock_container *sc) +{ + write_lock_bh(&sk->sk_callback_lock); + + /* accepted sockets inherit the old listen socket data ready */ + if (sk->sk_data_ready == o2net_listen_data_ready) { + sk->sk_data_ready = sk->sk_user_data; + sk->sk_user_data = NULL; + } + + BUG_ON(sk->sk_user_data != NULL); + sk->sk_user_data = sc; + sc_get(sc); + + sc->sc_data_ready = sk->sk_data_ready; + sc->sc_state_change = sk->sk_state_change; + sk->sk_data_ready = o2net_data_ready; + sk->sk_state_change = o2net_state_change; + + write_unlock_bh(&sk->sk_callback_lock); +} + +static int o2net_unregister_callbacks(struct sock *sk, + struct o2net_sock_container *sc) +{ + int ret = 0; + + write_lock_bh(&sk->sk_callback_lock); + if (sk->sk_user_data == sc) { + ret = 1; + sk->sk_user_data = NULL; + sk->sk_data_ready = sc->sc_data_ready; + sk->sk_state_change = sc->sc_state_change; + } + write_unlock_bh(&sk->sk_callback_lock); + + return ret; +} + +/* + * this is a little helper that is called by callers who have seen a problem + * with an sc and want to detach it from the nn if someone already hasn't beat + * them to it. if an error is given then the shutdown will be persistent + * and pending transmits will be canceled. + */ +static void o2net_ensure_shutdown(struct o2net_node *nn, + struct o2net_sock_container *sc, + int err) +{ + spin_lock(&nn->nn_lock); + if (nn->nn_sc == sc) + o2net_set_nn_state(nn, NULL, 0, err); + spin_unlock(&nn->nn_lock); +} + +/* + * This work queue function performs the blocking parts of socket shutdown. A + * few paths lead here. set_nn_state will trigger this callback if it sees an + * sc detached from the nn. state_change will also trigger this callback + * directly when it sees errors. In that case we need to call set_nn_state + * ourselves as state_change couldn't get the nn_lock and call set_nn_state + * itself. + */ +static void o2net_shutdown_sc(void *arg) +{ + struct o2net_sock_container *sc = arg; + struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); + + sclog(sc, "shutting down\n"); + + /* drop the callbacks ref and call shutdown only once */ + if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { + /* we shouldn't flush as we're in the thread, the + * races with pending sc work structs are harmless */ + del_timer_sync(&sc->sc_idle_timeout); + o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); + sc_put(sc); + sc->sc_sock->ops->shutdown(sc->sc_sock, + RCV_SHUTDOWN|SEND_SHUTDOWN); + } + + /* not fatal so failed connects before the other guy has our + * heartbeat can be retried */ + o2net_ensure_shutdown(nn, sc, 0); + sc_put(sc); +} + +/* ------------------------------------------------------------ */ + +static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, + u32 key) +{ + int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); + + if (ret == 0) + ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); + + return ret; +} + +static struct o2net_msg_handler * +o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, + struct rb_node **ret_parent) +{ + struct rb_node **p = &o2net_handler_tree.rb_node; + struct rb_node *parent = NULL; + struct o2net_msg_handler *nmh, *ret = NULL; + int cmp; + + while (*p) { + parent = *p; + nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); + cmp = o2net_handler_cmp(nmh, msg_type, key); + + if (cmp < 0) + p = &(*p)->rb_left; + else if (cmp > 0) + p = &(*p)->rb_right; + else { + ret = nmh; + break; + } + } + + if (ret_p != NULL) + *ret_p = p; + if (ret_parent != NULL) + *ret_parent = parent; + + return ret; +} + +static void o2net_handler_kref_release(struct kref *kref) +{ + struct o2net_msg_handler *nmh; + nmh = container_of(kref, struct o2net_msg_handler, nh_kref); + + kfree(nmh); +} + +static void o2net_handler_put(struct o2net_msg_handler *nmh) +{ + kref_put(&nmh->nh_kref, o2net_handler_kref_release); +} + +/* max_len is protection for the handler func. incoming messages won't + * be given to the handler if their payload is longer than the max. */ +int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, + o2net_msg_handler_func *func, void *data, + struct list_head *unreg_list) +{ + struct o2net_msg_handler *nmh = NULL; + struct rb_node **p, *parent; + int ret = 0; + + if (max_len > O2NET_MAX_PAYLOAD_BYTES) { + mlog(0, "max_len for message handler out of range: %u\n", + max_len); + ret = -EINVAL; + goto out; + } + + if (!msg_type) { + mlog(0, "no message type provided: %u, %p\n", msg_type, func); + ret = -EINVAL; + goto out; + + } + if (!func) { + mlog(0, "no message handler provided: %u, %p\n", + msg_type, func); + ret = -EINVAL; + goto out; + } + + nmh = kcalloc(1, sizeof(struct o2net_msg_handler), GFP_NOFS); + if (nmh == NULL) { + ret = -ENOMEM; + goto out; + } + + nmh->nh_func = func; + nmh->nh_func_data = data; + nmh->nh_msg_type = msg_type; + nmh->nh_max_len = max_len; + nmh->nh_key = key; + /* the tree and list get this ref.. they're both removed in + * unregister when this ref is dropped */ + kref_init(&nmh->nh_kref); + INIT_LIST_HEAD(&nmh->nh_unregister_item); + + write_lock(&o2net_handler_lock); + if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) + ret = -EEXIST; + else { + rb_link_node(&nmh->nh_node, parent, p); + rb_insert_color(&nmh->nh_node, &o2net_handler_tree); + list_add_tail(&nmh->nh_unregister_item, unreg_list); + + mlog(ML_TCP, "registered handler func %p type %u key %08x\n", + func, msg_type, key); + /* we've had some trouble with handlers seemingly vanishing. */ + mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, + &parent) == NULL, + "couldn't find handler we *just* registerd " + "for type %u key %08x\n", msg_type, key); + } + write_unlock(&o2net_handler_lock); + if (ret) + goto out; + +out: + if (ret) + kfree(nmh); + + return ret; +} +EXPORT_SYMBOL_GPL(o2net_register_handler); + +void o2net_unregister_handler_list(struct list_head *list) +{ + struct list_head *pos, *n; + struct o2net_msg_handler *nmh; + + write_lock(&o2net_handler_lock); + list_for_each_safe(pos, n, list) { + nmh = list_entry(pos, struct o2net_msg_handler, + nh_unregister_item); + mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", + nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); + rb_erase(&nmh->nh_node, &o2net_handler_tree); + list_del_init(&nmh->nh_unregister_item); + kref_put(&nmh->nh_kref, o2net_handler_kref_release); + } + write_unlock(&o2net_handler_lock); +} +EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); + +static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) +{ + struct o2net_msg_handler *nmh; + + read_lock(&o2net_handler_lock); + nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); + if (nmh) + kref_get(&nmh->nh_kref); + read_unlock(&o2net_handler_lock); + + return nmh; +} + +/* ------------------------------------------------------------ */ + +static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) +{ + int ret; + mm_segment_t oldfs; + struct kvec vec = { + .iov_len = len, + .iov_base = data, + }; + struct msghdr msg = { + .msg_iovlen = 1, + .msg_iov = (struct iovec *)&vec, + .msg_flags = MSG_DONTWAIT, + }; + + oldfs = get_fs(); + set_fs(get_ds()); + ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); + set_fs(oldfs); + + return ret; +} + +static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, + size_t veclen, size_t total) +{ + int ret; + mm_segment_t oldfs; + struct msghdr msg = { + .msg_iov = (struct iovec *)vec, + .msg_iovlen = veclen, + }; + + if (sock == NULL) { + ret = -EINVAL; + goto out; + } + + oldfs = get_fs(); + set_fs(get_ds()); + ret = sock_sendmsg(sock, &msg, total); + set_fs(oldfs); + if (ret != total) { + mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, + total); + if (ret >= 0) + ret = -EPIPE; /* should be smarter, I bet */ + goto out; + } + + ret = 0; +out: + if (ret < 0) + mlog(0, "returning error: %d\n", ret); + return ret; +} + +static void o2net_sendpage(struct o2net_sock_container *sc, + void *kmalloced_virt, + size_t size) +{ + struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); + ssize_t ret; + + + ret = sc->sc_sock->ops->sendpage(sc->sc_sock, + virt_to_page(kmalloced_virt), + (long)kmalloced_virt & ~PAGE_MASK, + size, MSG_DONTWAIT); + if (ret != size) { + mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT + " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); + o2net_ensure_shutdown(nn, sc, 0); + } +} + +static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) +{ + memset(msg, 0, sizeof(struct o2net_msg)); + msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); + msg->data_len = cpu_to_be16(data_len); + msg->msg_type = cpu_to_be16(msg_type); + msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); + msg->status = 0; + msg->key = cpu_to_be32(key); +} + +static int o2net_tx_can_proceed(struct o2net_node *nn, + struct o2net_sock_container **sc_ret, + int *error) +{ + int ret = 0; + + spin_lock(&nn->nn_lock); + if (nn->nn_persistent_error) { + ret = 1; + *sc_ret = NULL; + *error = nn->nn_persistent_error; + } else if (nn->nn_sc_valid) { + kref_get(&nn->nn_sc->sc_kref); + + ret = 1; + *sc_ret = nn->nn_sc; + *error = 0; + } + spin_unlock(&nn->nn_lock); + + return ret; +} + +int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, + size_t caller_veclen, u8 target_node, int *status) +{ + int ret, error = 0; + struct o2net_msg *msg = NULL; + size_t veclen, caller_bytes = 0; + struct kvec *vec = NULL; + struct o2net_sock_container *sc = NULL; + struct o2net_node *nn = o2net_nn_from_num(target_node); + struct o2net_status_wait nsw = { + .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), + }; + + if (o2net_wq == NULL) { + mlog(0, "attempt to tx without o2netd running\n"); + ret = -ESRCH; + goto out; + } + + if (caller_veclen == 0) { + mlog(0, "bad kvec array length\n"); + ret = -EINVAL; + goto out; + } + + caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); + if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { + mlog(0, "total payload len %zu too large\n", caller_bytes); + ret = -EINVAL; + goto out; + } + + if (target_node == o2nm_this_node()) { + ret = -ELOOP; + goto out; + } + + ret = wait_event_interruptible(nn->nn_sc_wq, + o2net_tx_can_proceed(nn, &sc, &error)); + if (!ret && error) + ret = error; + if (ret) + goto out; + + veclen = caller_veclen + 1; + vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); + if (vec == NULL) { + mlog(0, "failed to %zu element kvec!\n", veclen); + ret = -ENOMEM; + goto out; + } + + msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); + if (!msg) { + mlog(0, "failed to allocate a o2net_msg!\n"); + ret = -ENOMEM; + goto out; + } + + o2net_init_msg(msg, caller_bytes, msg_type, key); + + vec[0].iov_len = sizeof(struct o2net_msg); + vec[0].iov_base = msg; + memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); + + ret = o2net_prep_nsw(nn, &nsw); + if (ret) + goto out; + + msg->msg_num = cpu_to_be32(nsw.ns_id); + + /* finally, convert the message header to network byte-order + * and send */ + ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, + sizeof(struct o2net_msg) + caller_bytes); + msglog(msg, "sending returned %d\n", ret); + if (ret < 0) { + mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); + goto out; + } + + /* wait on other node's handler */ + wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); + + /* Note that we avoid overwriting the callers status return + * variable if a system error was reported on the other + * side. Callers beware. */ + ret = o2net_sys_err_to_errno(nsw.ns_sys_status); + if (status && !ret) + *status = nsw.ns_status; + + mlog(0, "woken, returning system status %d, user status %d\n", + ret, nsw.ns_status); +out: + if (sc) + sc_put(sc); + if (vec) + kfree(vec); + if (msg) + kfree(msg); + o2net_complete_nsw(nn, &nsw, 0, 0, 0); + return ret; +} +EXPORT_SYMBOL_GPL(o2net_send_message_vec); + +int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, + u8 target_node, int *status) +{ + struct kvec vec = { + .iov_base = data, + .iov_len = len, + }; + return o2net_send_message_vec(msg_type, key, &vec, 1, + target_node, status); +} +EXPORT_SYMBOL_GPL(o2net_send_message); + +static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, + enum o2net_system_error syserr, int err) +{ + struct kvec vec = { + .iov_base = hdr, + .iov_len = sizeof(struct o2net_msg), + }; + + BUG_ON(syserr >= O2NET_ERR_MAX); + + /* leave other fields intact from the incoming message, msg_num + * in particular */ + hdr->sys_status = cpu_to_be32(syserr); + hdr->status = cpu_to_be32(err); + hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic + hdr->data_len = 0; + + msglog(hdr, "about to send status magic %d\n", err); + /* hdr has been in host byteorder this whole time */ + return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); +} + +/* this returns -errno if the header was unknown or too large, etc. + * after this is called the buffer us reused for the next message */ +static int o2net_process_message(struct o2net_sock_container *sc, + struct o2net_msg *hdr) +{ + struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); + int ret = 0, handler_status; + enum o2net_system_error syserr; + struct o2net_msg_handler *nmh = NULL; + + msglog(hdr, "processing message\n"); + + o2net_sc_postpone_idle(sc); + + switch(be16_to_cpu(hdr->magic)) { + case O2NET_MSG_STATUS_MAGIC: + /* special type for returning message status */ + o2net_complete_nsw(nn, NULL, + be32_to_cpu(hdr->msg_num), + be32_to_cpu(hdr->sys_status), + be32_to_cpu(hdr->status)); + goto out; + case O2NET_MSG_KEEP_REQ_MAGIC: + o2net_sendpage(sc, o2net_keep_resp, + sizeof(*o2net_keep_resp)); + goto out; + case O2NET_MSG_KEEP_RESP_MAGIC: + goto out; + case O2NET_MSG_MAGIC: + break; + default: + msglog(hdr, "bad magic\n"); + ret = -EINVAL; + goto out; + break; + } + + /* find a handler for it */ + handler_status = 0; + nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), + be32_to_cpu(hdr->key)); + if (!nmh) { + mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", + be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); + syserr = O2NET_ERR_NO_HNDLR; + goto out_respond; + } + + syserr = O2NET_ERR_NONE; + + if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) + syserr = O2NET_ERR_OVERFLOW; + + if (syserr != O2NET_ERR_NONE) + goto out_respond; + + do_gettimeofday(&sc->sc_tv_func_start); + sc->sc_msg_key = be32_to_cpu(hdr->key); + sc->sc_msg_type = be16_to_cpu(hdr->msg_type); + handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + + be16_to_cpu(hdr->data_len), + nmh->nh_func_data); + do_gettimeofday(&sc->sc_tv_func_stop); + +out_respond: + /* this destroys the hdr, so don't use it after this */ + ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, + handler_status); + hdr = NULL; + mlog(0, "sending handler status %d, syserr %d returned %d\n", + handler_status, syserr, ret); + +out: + if (nmh) + o2net_handler_put(nmh); + return ret; +} + +static int o2net_check_handshake(struct o2net_sock_container *sc) +{ + struct o2net_handshake *hand = page_address(sc->sc_page); + struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); + + if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { + mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol " + "version %llu but %llu is required, disconnecting\n", + SC_NODEF_ARGS(sc), + (unsigned long long)be64_to_cpu(hand->protocol_version), + O2NET_PROTOCOL_VERSION); + + /* don't bother reconnecting if its the wrong version. */ + o2net_ensure_shutdown(nn, sc, -ENOTCONN); + return -1; + } + + sc->sc_handshake_ok = 1; + + spin_lock(&nn->nn_lock); + /* set valid and queue the idle timers only if it hasn't been + * shut down already */ + if (nn->nn_sc == sc) { + o2net_sc_postpone_idle(sc); + o2net_set_nn_state(nn, sc, 1, 0); + } + spin_unlock(&nn->nn_lock); + + /* shift everything up as though it wasn't there */ + sc->sc_page_off -= sizeof(struct o2net_handshake); + if (sc->sc_page_off) + memmove(hand, hand + 1, sc->sc_page_off); + + return 0; +} + +/* this demuxes the queued rx bytes into header or payload bits and calls + * handlers as each full message is read off the socket. it returns -error, + * == 0 eof, or > 0 for progress made.*/ +static int o2net_advance_rx(struct o2net_sock_container *sc) +{ + struct o2net_msg *hdr; + int ret = 0; + void *data; + size_t datalen; + + sclog(sc, "receiving\n"); + do_gettimeofday(&sc->sc_tv_advance_start); + + /* do we need more header? */ + if (sc->sc_page_off < sizeof(struct o2net_msg)) { + data = page_address(sc->sc_page) + sc->sc_page_off; + datalen = sizeof(struct o2net_msg) - sc->sc_page_off; + ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); + if (ret > 0) { + sc->sc_page_off += ret; + + /* this working relies on the handshake being + * smaller than the normal message header */ + if (sc->sc_page_off >= sizeof(struct o2net_handshake)&& + !sc->sc_handshake_ok && o2net_check_handshake(sc)) { + ret = -EPROTO; + goto out; + } + + /* only swab incoming here.. we can + * only get here once as we cross from + * being under to over */ + if (sc->sc_page_off == sizeof(struct o2net_msg)) { + hdr = page_address(sc->sc_page); + if (be16_to_cpu(hdr->data_len) > + O2NET_MAX_PAYLOAD_BYTES) + ret = -EOVERFLOW; + } + } + if (ret <= 0) + goto out; + } + + if (sc->sc_page_off < sizeof(struct o2net_msg)) { + /* oof, still don't have a header */ + goto out; + } + + /* this was swabbed above when we first read it */ + hdr = page_address(sc->sc_page); + + msglog(hdr, "at page_off %zu\n", sc->sc_page_off); + + /* do we need more payload? */ + if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { + /* need more payload */ + data = page_address(sc->sc_page) + sc->sc_page_off; + datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - + sc->sc_page_off; + ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); + if (ret > 0) + sc->sc_page_off += ret; + if (ret <= 0) + goto out; + } + + if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { + /* we can only get here once, the first time we read + * the payload.. so set ret to progress if the handler + * works out. after calling this the message is toast */ + ret = o2net_process_message(sc, hdr); + if (ret == 0) + ret = 1; + sc->sc_page_off = 0; + } + +out: + sclog(sc, "ret = %d\n", ret); + do_gettimeofday(&sc->sc_tv_advance_stop); + return ret; +} + +/* this work func is triggerd by data ready. it reads until it can read no + * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing + * our work the work struct will be marked and we'll be called again. */ +static void o2net_rx_until_empty(void *arg) +{ + struct o2net_sock_container *sc = arg; + int ret; + + do { + ret = o2net_advance_rx(sc); + } while (ret > 0); + + if (ret <= 0 && ret != -EAGAIN) { + struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); + sclog(sc, "saw error %d, closing\n", ret); + /* not permanent so read failed handshake can retry */ + o2net_ensure_shutdown(nn, sc, 0); + } + + sc_put(sc); +} + +static int o2net_set_nodelay(struct socket *sock) +{ + int ret, val = 1; + mm_segment_t oldfs; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + + /* + * Dear unsuspecting programmer, + * + * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level + * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will + * silently turn into SO_DEBUG. + * + * Yours, + * Keeper of hilariously fragile interfaces. + */ + ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, + (char __user *)&val, sizeof(val)); + + set_fs(oldfs); + return ret; +} + +/* ------------------------------------------------------------ */ + +/* called when a connect completes and after a sock is accepted. the + * rx path will see the response and mark the sc valid */ +static void o2net_sc_connect_completed(void *arg) +{ + struct o2net_sock_container *sc = arg; + + mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", + (unsigned long long)O2NET_PROTOCOL_VERSION, + (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); + + o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); + sc_put(sc); +} + +/* this is called as a work_struct func. */ +static void o2net_sc_send_keep_req(void *arg) +{ + struct o2net_sock_container *sc = arg; + + o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); + sc_put(sc); +} + +/* socket shutdown does a del_timer_sync against this as it tears down. + * we can't start this timer until we've got to the point in sc buildup + * where shutdown is going to be involved */ +static void o2net_idle_timer(unsigned long data) +{ + struct o2net_sock_container *sc = (struct o2net_sock_container *)data; + struct timeval now; + + do_gettimeofday(&now); + + mlog(ML_NOTICE, "connection to " SC_NODEF_FMT " has been idle for 10 " + "seconds, shutting it down.\n", SC_NODEF_ARGS(sc)); + mlog(ML_NOTICE, "here are some times that might help debug the " + "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv " + "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n", + sc->sc_tv_timer.tv_sec, sc->sc_tv_timer.tv_usec, + now.tv_sec, now.tv_usec, + sc->sc_tv_data_ready.tv_sec, sc->sc_tv_data_ready.tv_usec, + sc->sc_tv_advance_start.tv_sec, sc->sc_tv_advance_start.tv_usec, + sc->sc_tv_advance_stop.tv_sec, sc->sc_tv_advance_stop.tv_usec, + sc->sc_msg_key, sc->sc_msg_type, + sc->sc_tv_func_start.tv_sec, sc->sc_tv_func_start.tv_usec, + sc->sc_tv_func_stop.tv_sec, sc->sc_tv_func_stop.tv_usec); + + o2net_sc_queue_work(sc, &sc->sc_shutdown_work); +} + +static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) +{ + o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); + o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, + O2NET_KEEPALIVE_DELAY_SECS * HZ); + do_gettimeofday(&sc->sc_tv_timer); + mod_timer(&sc->sc_idle_timeout, + jiffies + (O2NET_IDLE_TIMEOUT_SECS * HZ)); +} + +/* this work func is kicked whenever a path sets the nn state which doesn't + * have valid set. This includes seeing hb come up, losing a connection, + * having a connect attempt fail, etc. This centralizes the logic which decides + * if a connect attempt should be made or if we should give up and all future + * transmit attempts should fail */ +static void o2net_start_connect(void *arg) +{ + struct o2net_node *nn = arg; + struct o2net_sock_container *sc = NULL; + struct o2nm_node *node = NULL; + struct socket *sock = NULL; + struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; + int ret = 0; + + /* if we're greater we initiate tx, otherwise we accept */ + if (o2nm_this_node() <= o2net_num_from_nn(nn)) + goto out; + + /* watch for racing with tearing a node down */ + node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); + if (node == NULL) { + ret = 0; + goto out; + } + + spin_lock(&nn->nn_lock); + /* see if we already have one pending or have given up */ + if (nn->nn_sc || nn->nn_persistent_error) + arg = NULL; + spin_unlock(&nn->nn_lock); + if (arg == NULL) /* *shrug*, needed some indicator */ + goto out; + + nn->nn_last_connect_attempt = jiffies; + + sc = sc_alloc(node); + if (sc == NULL) { + mlog(0, "couldn't allocate sc\n"); + ret = -ENOMEM; + goto out; + } + + ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); + if (ret < 0) { + mlog(0, "can't create socket: %d\n", ret); + goto out; + } + sc->sc_sock = sock; /* freed by sc_kref_release */ + + sock->sk->sk_allocation = GFP_ATOMIC; + + myaddr.sin_family = AF_INET; + myaddr.sin_port = (__force u16)htons(0); /* any port */ + + ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, + sizeof(myaddr)); + if (ret) { + mlog(0, "bind failed: %d\n", ret); + goto out; + } + + ret = o2net_set_nodelay(sc->sc_sock); + if (ret) { + mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); + goto out; + } + + o2net_register_callbacks(sc->sc_sock->sk, sc); + + spin_lock(&nn->nn_lock); + /* handshake completion will set nn->nn_sc_valid */ + o2net_set_nn_state(nn, sc, 0, 0); + spin_unlock(&nn->nn_lock); + + remoteaddr.sin_family = AF_INET; + remoteaddr.sin_addr.s_addr = (__force u32)node->nd_ipv4_address; + remoteaddr.sin_port = (__force u16)node->nd_ipv4_port; + + ret = sc->sc_sock->ops->connect(sc->sc_sock, + (struct sockaddr *)&remoteaddr, + sizeof(remoteaddr), + O_NONBLOCK); + if (ret == -EINPROGRESS) + ret = 0; + +out: + if (ret) { + mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed " + "with errno %d\n", SC_NODEF_ARGS(sc), ret); + /* 0 err so that another will be queued and attempted + * from set_nn_state */ + if (sc) + o2net_ensure_shutdown(nn, sc, 0); + } + if (sc) + sc_put(sc); + if (node) + o2nm_node_put(node); + + return; +} + +static void o2net_connect_expired(void *arg) +{ + struct o2net_node *nn = arg; + + spin_lock(&nn->nn_lock); + if (!nn->nn_sc_valid) { + mlog(ML_ERROR, "no connection established with node %u after " + "%u seconds, giving up and returning errors.\n", + o2net_num_from_nn(nn), O2NET_IDLE_TIMEOUT_SECS); + + o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); + } + spin_unlock(&nn->nn_lock); +} + +static void o2net_still_up(void *arg) +{ + struct o2net_node *nn = arg; + + o2quo_hb_still_up(o2net_num_from_nn(nn)); +} + +/* ------------------------------------------------------------ */ + +void o2net_disconnect_node(struct o2nm_node *node) +{ + struct o2net_node *nn = o2net_nn_from_num(node->nd_num); + + /* don't reconnect until it's heartbeating again */ + spin_lock(&nn->nn_lock); + o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); + spin_unlock(&nn->nn_lock); + + if (o2net_wq) { + cancel_delayed_work(&nn->nn_connect_expired); + cancel_delayed_work(&nn->nn_connect_work); + cancel_delayed_work(&nn->nn_still_up); + flush_workqueue(o2net_wq); + } +} + +static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, + void *data) +{ + o2quo_hb_down(node_num); + + if (node_num != o2nm_this_node()) + o2net_disconnect_node(node); +} + +static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, + void *data) +{ + struct o2net_node *nn = o2net_nn_from_num(node_num); + + o2quo_hb_up(node_num); + + /* ensure an immediate connect attempt */ + nn->nn_last_connect_attempt = jiffies - + (msecs_to_jiffies(O2NET_RECONNECT_DELAY_MS) + 1); + + if (node_num != o2nm_this_node()) { + /* heartbeat doesn't work unless a local node number is + * configured and doing so brings up the o2net_wq, so we can + * use it.. */ + queue_delayed_work(o2net_wq, &nn->nn_connect_expired, + O2NET_IDLE_TIMEOUT_SECS * HZ); + + /* believe it or not, accept and node hearbeating testing + * can succeed for this node before we got here.. so + * only use set_nn_state to clear the persistent error + * if that hasn't already happened */ + spin_lock(&nn->nn_lock); + if (nn->nn_persistent_error) + o2net_set_nn_state(nn, NULL, 0, 0); + spin_unlock(&nn->nn_lock); + } +} + +void o2net_unregister_hb_callbacks(void) +{ + int ret; + + ret = o2hb_unregister_callback(&o2net_hb_up); + if (ret < 0) + mlog(ML_ERROR, "Status return %d unregistering heartbeat up " + "callback!\n", ret); + + ret = o2hb_unregister_callback(&o2net_hb_down); + if (ret < 0) + mlog(ML_ERROR, "Status return %d unregistering heartbeat down " + "callback!\n", ret); +} + +int o2net_register_hb_callbacks(void) +{ + int ret; + + o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, + o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); + o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, + o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); + + ret = o2hb_register_callback(&o2net_hb_up); + if (ret == 0) + ret = o2hb_register_callback(&o2net_hb_down); + + if (ret) + o2net_unregister_hb_callbacks(); + + return ret; +} + +/* ------------------------------------------------------------ */ + +static int o2net_accept_one(struct socket *sock) +{ + int ret, slen; + struct sockaddr_in sin; + struct socket *new_sock = NULL; + struct o2nm_node *node = NULL; + struct o2net_sock_container *sc = NULL; + struct o2net_node *nn; + + BUG_ON(sock == NULL); + ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, + sock->sk->sk_protocol, &new_sock); + if (ret) + goto out; + + new_sock->type = sock->type; + new_sock->ops = sock->ops; + ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); + if (ret < 0) + goto out; + + new_sock->sk->sk_allocation = GFP_ATOMIC; + + ret = o2net_set_nodelay(new_sock); + if (ret) { + mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); + goto out; + } + + slen = sizeof(sin); + ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, + &slen, 1); + if (ret < 0) + goto out; + + node = o2nm_get_node_by_ip((__force __be32)sin.sin_addr.s_addr); + if (node == NULL) { + mlog(ML_NOTICE, "attempt to connect from unknown node at " + "%u.%u.%u.%u:%d\n", NIPQUAD(sin.sin_addr.s_addr), + ntohs((__force __be16)sin.sin_port)); + ret = -EINVAL; + goto out; + } + + if (o2nm_this_node() > node->nd_num) { + mlog(ML_NOTICE, "unexpected connect attempted from a lower " + "numbered node '%s' at " "%u.%u.%u.%u:%d with num %u\n", + node->nd_name, NIPQUAD(sin.sin_addr.s_addr), + ntohs((__force __be16)sin.sin_port), node->nd_num); + ret = -EINVAL; + goto out; + } + + /* this happens all the time when the other node sees our heartbeat + * and tries to connect before we see their heartbeat */ + if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { + mlog(ML_CONN, "attempt to connect from node '%s' at " + "%u.%u.%u.%u:%d but it isn't heartbeating\n", + node->nd_name, NIPQUAD(sin.sin_addr.s_addr), + ntohs((__force __be16)sin.sin_port)); + ret = -EINVAL; + goto out; + } + + nn = o2net_nn_from_num(node->nd_num); + + spin_lock(&nn->nn_lock); + if (nn->nn_sc) + ret = -EBUSY; + else + ret = 0; + spin_unlock(&nn->nn_lock); + if (ret) { + mlog(ML_NOTICE, "attempt to connect from node '%s' at " + "%u.%u.%u.%u:%d but it already has an open connection\n", + node->nd_name, NIPQUAD(sin.sin_addr.s_addr), + ntohs((__force __be16)sin.sin_port)); + goto out; + } + + sc = sc_alloc(node); + if (sc == NULL) { + ret = -ENOMEM; + goto out; + } + + sc->sc_sock = new_sock; + new_sock = NULL; + + spin_lock(&nn->nn_lock); + o2net_set_nn_state(nn, sc, 0, 0); + spin_unlock(&nn->nn_lock); + + o2net_register_callbacks(sc->sc_sock->sk, sc); + o2net_sc_queue_work(sc, &sc->sc_rx_work); + + o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); + +out: + if (new_sock) + sock_release(new_sock); + if (node) + o2nm_node_put(node); + if (sc) + sc_put(sc); + return ret; +} + +static void o2net_accept_many(void *arg) +{ + struct socket *sock = arg; + while (o2net_accept_one(sock) == 0) + cond_resched(); +} + +static void o2net_listen_data_ready(struct sock *sk, int bytes) +{ + void (*ready)(struct sock *sk, int bytes); + + read_lock(&sk->sk_callback_lock); + ready = sk->sk_user_data; + if (ready == NULL) { /* check for teardown race */ + ready = sk->sk_data_ready; + goto out; + } + + /* ->sk_data_ready is also called for a newly established child socket + * before it has been accepted and the acceptor has set up their + * data_ready.. we only want to queue listen work for our listening + * socket */ + if (sk->sk_state == TCP_LISTEN) { + mlog(ML_TCP, "bytes: %d\n", bytes); + queue_work(o2net_wq, &o2net_listen_work); + } + +out: + read_unlock(&sk->sk_callback_lock); + ready(sk, bytes); +} + +static int o2net_open_listening_sock(__be16 port) +{ + struct socket *sock = NULL; + int ret; + struct sockaddr_in sin = { + .sin_family = PF_INET, + .sin_addr = { .s_addr = (__force u32)htonl(INADDR_ANY) }, + .sin_port = (__force u16)port, + }; + + ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); + if (ret < 0) { + mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret); + goto out; + } + + sock->sk->sk_allocation = GFP_ATOMIC; + + write_lock_bh(&sock->sk->sk_callback_lock); + sock->sk->sk_user_data = sock->sk->sk_data_ready; + sock->sk->sk_data_ready = o2net_listen_data_ready; + write_unlock_bh(&sock->sk->sk_callback_lock); + + o2net_listen_sock = sock; + INIT_WORK(&o2net_listen_work, o2net_accept_many, sock); + + sock->sk->sk_reuse = 1; + ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); + if (ret < 0) { + mlog(ML_ERROR, "unable to bind socket to port %d, ret=%d\n", + ntohs(port), ret); + goto out; + } + + ret = sock->ops->listen(sock, 64); + if (ret < 0) { + mlog(ML_ERROR, "unable to listen on port %d, ret=%d\n", + ntohs(port), ret); + } + +out: + if (ret) { + o2net_listen_sock = NULL; + if (sock) + sock_release(sock); + } + return ret; +} + +/* + * called from node manager when we should bring up our network listening + * socket. node manager handles all the serialization to only call this + * once and to match it with o2net_stop_listening(). note, + * o2nm_this_node() doesn't work yet as we're being called while it + * is being set up. + */ +int o2net_start_listening(struct o2nm_node *node) +{ + int ret = 0; + + BUG_ON(o2net_wq != NULL); + BUG_ON(o2net_listen_sock != NULL); + + mlog(ML_KTHREAD, "starting o2net thread...\n"); + o2net_wq = create_singlethread_workqueue("o2net"); + if (o2net_wq == NULL) { + mlog(ML_ERROR, "unable to launch o2net thread\n"); + return -ENOMEM; /* ? */ + } + + ret = o2net_open_listening_sock(node->nd_ipv4_port); + if (ret) { + destroy_workqueue(o2net_wq); + o2net_wq = NULL; + } else + o2quo_conn_up(node->nd_num); + + return ret; +} + +/* again, o2nm_this_node() doesn't work here as we're involved in + * tearing it down */ +void o2net_stop_listening(struct o2nm_node *node) +{ + struct socket *sock = o2net_listen_sock; + size_t i; + + BUG_ON(o2net_wq == NULL); + BUG_ON(o2net_listen_sock == NULL); + + /* stop the listening socket from generating work */ + write_lock_bh(&sock->sk->sk_callback_lock); + sock->sk->sk_data_ready = sock->sk->sk_user_data; + sock->sk->sk_user_data = NULL; + write_unlock_bh(&sock->sk->sk_callback_lock); + + for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { + struct o2nm_node *node = o2nm_get_node_by_num(i); + if (node) { + o2net_disconnect_node(node); + o2nm_node_put(node); + } + } + + /* finish all work and tear down the work queue */ + mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); + destroy_workqueue(o2net_wq); + o2net_wq = NULL; + + sock_release(o2net_listen_sock); + o2net_listen_sock = NULL; + + o2quo_conn_err(node->nd_num); +} + +/* ------------------------------------------------------------ */ + +int o2net_init(void) +{ + unsigned long i; + + o2quo_init(); + + o2net_hand = kcalloc(1, sizeof(struct o2net_handshake), GFP_KERNEL); + o2net_keep_req = kcalloc(1, sizeof(struct o2net_msg), GFP_KERNEL); + o2net_keep_resp = kcalloc(1, sizeof(struct o2net_msg), GFP_KERNEL); + if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { + kfree(o2net_hand); + kfree(o2net_keep_req); + kfree(o2net_keep_resp); + return -ENOMEM; + } + + o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); + o2net_hand->connector_id = cpu_to_be64(1); + + o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); + o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); + + for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { + struct o2net_node *nn = o2net_nn_from_num(i); + + spin_lock_init(&nn->nn_lock); + INIT_WORK(&nn->nn_connect_work, o2net_start_connect, nn); + INIT_WORK(&nn->nn_connect_expired, o2net_connect_expired, nn); + INIT_WORK(&nn->nn_still_up, o2net_still_up, nn); + /* until we see hb from a node we'll return einval */ + nn->nn_persistent_error = -ENOTCONN; + init_waitqueue_head(&nn->nn_sc_wq); + idr_init(&nn->nn_status_idr); + INIT_LIST_HEAD(&nn->nn_status_list); + } + + return 0; +} + +void o2net_exit(void) +{ + o2quo_exit(); + kfree(o2net_hand); + kfree(o2net_keep_req); + kfree(o2net_keep_resp); +} diff --git a/fs/ocfs2/cluster/tcp.h b/fs/ocfs2/cluster/tcp.h new file mode 100644 index 0000000..a6f4585 --- /dev/null +++ b/fs/ocfs2/cluster/tcp.h @@ -0,0 +1,113 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * tcp.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef O2CLUSTER_TCP_H +#define O2CLUSTER_TCP_H + +#include <linux/socket.h> +#ifdef __KERNEL__ +#include <net/sock.h> +#include <linux/tcp.h> +#else +#include <sys/socket.h> +#endif +#include <linux/inet.h> +#include <linux/in.h> + +struct o2net_msg +{ + __be16 magic; + __be16 data_len; + __be16 msg_type; + __be16 pad1; + __be32 sys_status; + __be32 status; + __be32 key; + __be32 msg_num; + __u8 buf[0]; +}; + +typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data); + +#define O2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct o2net_msg)) + +/* TODO: figure this out.... */ +static inline int o2net_link_down(int err, struct socket *sock) +{ + if (sock) { + if (sock->sk->sk_state != TCP_ESTABLISHED && + sock->sk->sk_state != TCP_CLOSE_WAIT) + return 1; + } + + if (err >= 0) + return 0; + switch (err) { + /* ????????????????????????? */ + case -ERESTARTSYS: + case -EBADF: + /* When the server has died, an ICMP port unreachable + * message prompts ECONNREFUSED. */ + case -ECONNREFUSED: + case -ENOTCONN: + case -ECONNRESET: + case -EPIPE: + return 1; + } + return 0; +} + +enum { + O2NET_DRIVER_UNINITED, + O2NET_DRIVER_READY, +}; + +int o2net_init_tcp_sock(struct inode *inode); +int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, + u8 target_node, int *status); +int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec, + size_t veclen, u8 target_node, int *status); +int o2net_broadcast_message(u32 msg_type, u32 key, void *data, u32 len, + struct inode *group); + +int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, + o2net_msg_handler_func *func, void *data, + struct list_head *unreg_list); +void o2net_unregister_handler_list(struct list_head *list); + +struct o2nm_node; +int o2net_register_hb_callbacks(void); +void o2net_unregister_hb_callbacks(void); +int o2net_start_listening(struct o2nm_node *node); +void o2net_stop_listening(struct o2nm_node *node); +void o2net_disconnect_node(struct o2nm_node *node); + +int o2net_init(void); +void o2net_exit(void); +int o2net_proc_init(struct proc_dir_entry *parent); +void o2net_proc_exit(struct proc_dir_entry *parent); + +#endif /* O2CLUSTER_TCP_H */ diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h new file mode 100644 index 0000000..ff9e2e2 --- /dev/null +++ b/fs/ocfs2/cluster/tcp_internal.h @@ -0,0 +1,174 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef O2CLUSTER_TCP_INTERNAL_H +#define O2CLUSTER_TCP_INTERNAL_H + +#define O2NET_MSG_MAGIC ((u16)0xfa55) +#define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56) +#define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57) +#define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58) + +/* same as hb delay, we're waiting for another node to recognize our hb */ +#define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS + +/* we're delaying our quorum decision so that heartbeat will have timed + * out truly dead nodes by the time we come around to making decisions + * on their number */ +#define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS) + +#define O2NET_KEEPALIVE_DELAY_SECS 5 +#define O2NET_IDLE_TIMEOUT_SECS 10 + +/* + * This version number represents quite a lot, unfortunately. It not + * only represents the raw network message protocol on the wire but also + * locking semantics of the file system using the protocol. It should + * be somewhere else, I'm sure, but right now it isn't. + * + * New in version 2: + * - full 64 bit i_size in the metadata lock lvbs + * - introduction of "rw" lock and pushing meta/data locking down + */ +#define O2NET_PROTOCOL_VERSION 2ULL +struct o2net_handshake { + __be64 protocol_version; + __be64 connector_id; +}; + +struct o2net_node { + /* this is never called from int/bh */ + spinlock_t nn_lock; + + /* set the moment an sc is allocated and a connect is started */ + struct o2net_sock_container *nn_sc; + /* _valid is only set after the handshake passes and tx can happen */ + unsigned nn_sc_valid:1; + /* if this is set tx just returns it */ + int nn_persistent_error; + + /* threads waiting for an sc to arrive wait on the wq for generation + * to increase. it is increased when a connecting socket succeeds + * or fails or when an accepted socket is attached. */ + wait_queue_head_t nn_sc_wq; + + struct idr nn_status_idr; + struct list_head nn_status_list; + + /* connects are attempted from when heartbeat comes up until either hb + * goes down, the node is unconfigured, no connect attempts succeed + * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work + * is queued from set_nn_state both from hb up and from itself if a + * connect attempt fails and so can be self-arming. shutdown is + * careful to first mark the nn such that no connects will be attempted + * before canceling delayed connect work and flushing the queue. */ + struct work_struct nn_connect_work; + unsigned long nn_last_connect_attempt; + + /* this is queued as nodes come up and is canceled when a connection is + * established. this expiring gives up on the node and errors out + * transmits */ + struct work_struct nn_connect_expired; + + /* after we give up on a socket we wait a while before deciding + * that it is still heartbeating and that we should do some + * quorum work */ + struct work_struct nn_still_up; +}; + +struct o2net_sock_container { + struct kref sc_kref; + /* the next two are vaild for the life time of the sc */ + struct socket *sc_sock; + struct o2nm_node *sc_node; + + /* all of these sc work structs hold refs on the sc while they are + * queued. they should not be able to ref a freed sc. the teardown + * race is with o2net_wq destruction in o2net_stop_listening() */ + + /* rx and connect work are generated from socket callbacks. sc + * shutdown removes the callbacks and then flushes the work queue */ + struct work_struct sc_rx_work; + struct work_struct sc_connect_work; + /* shutdown work is triggered in two ways. the simple way is + * for a code path calls ensure_shutdown which gets a lock, removes + * the sc from the nn, and queues the work. in this case the + * work is single-shot. the work is also queued from a sock + * callback, though, and in this case the work will find the sc + * still on the nn and will call ensure_shutdown itself.. this + * ends up triggering the shutdown work again, though nothing + * will be done in that second iteration. so work queue teardown + * has to be careful to remove the sc from the nn before waiting + * on the work queue so that the shutdown work doesn't remove the + * sc and rearm itself. + */ + struct work_struct sc_shutdown_work; + + struct timer_list sc_idle_timeout; + struct work_struct sc_keepalive_work; + + unsigned sc_handshake_ok:1; + + struct page *sc_page; + size_t sc_page_off; + + /* original handlers for the sockets */ + void (*sc_state_change)(struct sock *sk); + void (*sc_data_ready)(struct sock *sk, int bytes); + + struct timeval sc_tv_timer; + struct timeval sc_tv_data_ready; + struct timeval sc_tv_advance_start; + struct timeval sc_tv_advance_stop; + struct timeval sc_tv_func_start; + struct timeval sc_tv_func_stop; + u32 sc_msg_key; + u16 sc_msg_type; +}; + +struct o2net_msg_handler { + struct rb_node nh_node; + u32 nh_max_len; + u32 nh_msg_type; + u32 nh_key; + o2net_msg_handler_func *nh_func; + o2net_msg_handler_func *nh_func_data; + struct kref nh_kref; + struct list_head nh_unregister_item; +}; + +enum o2net_system_error { + O2NET_ERR_NONE = 0, + O2NET_ERR_NO_HNDLR, + O2NET_ERR_OVERFLOW, + O2NET_ERR_DIED, + O2NET_ERR_MAX +}; + +struct o2net_status_wait { + enum o2net_system_error ns_sys_status; + s32 ns_status; + int ns_id; + wait_queue_head_t ns_wq; + struct list_head ns_node_item; +}; + +#endif /* O2CLUSTER_TCP_INTERNAL_H */ diff --git a/fs/ocfs2/cluster/ver.c b/fs/ocfs2/cluster/ver.c new file mode 100644 index 0000000..7286c48 --- /dev/null +++ b/fs/ocfs2/cluster/ver.c @@ -0,0 +1,42 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ver.c + * + * version string + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> + +#include "ver.h" + +#define CLUSTER_BUILD_VERSION "1.3.3" + +#define VERSION_STR "OCFS2 Node Manager " CLUSTER_BUILD_VERSION + +void cluster_print_version(void) +{ + printk(KERN_INFO "%s\n", VERSION_STR); +} + +MODULE_DESCRIPTION(VERSION_STR); + +MODULE_VERSION(CLUSTER_BUILD_VERSION); diff --git a/fs/ocfs2/cluster/ver.h b/fs/ocfs2/cluster/ver.h new file mode 100644 index 0000000..32554c3 --- /dev/null +++ b/fs/ocfs2/cluster/ver.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ver.h + * + * Function prototypes + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef O2CLUSTER_VER_H +#define O2CLUSTER_VER_H + +void cluster_print_version(void); + +#endif /* O2CLUSTER_VER_H */ diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c new file mode 100644 index 0000000..bd85182 --- /dev/null +++ b/fs/ocfs2/dcache.c @@ -0,0 +1,91 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dcache.c + * + * dentry cache handling code + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/namei.h> + +#define MLOG_MASK_PREFIX ML_DCACHE +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dcache.h" +#include "file.h" +#include "inode.h" + +static int ocfs2_dentry_revalidate(struct dentry *dentry, + struct nameidata *nd) +{ + struct inode *inode = dentry->d_inode; + int ret = 0; /* if all else fails, just return false */ + struct ocfs2_super *osb; + + mlog_entry("(0x%p, '%.*s')\n", dentry, + dentry->d_name.len, dentry->d_name.name); + + /* Never trust a negative dentry - force a new lookup. */ + if (inode == NULL) { + mlog(0, "negative dentry: %.*s\n", dentry->d_name.len, + dentry->d_name.name); + goto bail; + } + + osb = OCFS2_SB(inode->i_sb); + + BUG_ON(!osb); + + if (inode != osb->root_inode) { + spin_lock(&OCFS2_I(inode)->ip_lock); + /* did we or someone else delete this inode? */ + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { + spin_unlock(&OCFS2_I(inode)->ip_lock); + mlog(0, "inode (%"MLFu64") deleted, returning false\n", + OCFS2_I(inode)->ip_blkno); + goto bail; + } + spin_unlock(&OCFS2_I(inode)->ip_lock); + + if (!inode->i_nlink) { + mlog(0, "Inode %"MLFu64" orphaned, returning false " + "dir = %d\n", OCFS2_I(inode)->ip_blkno, + S_ISDIR(inode->i_mode)); + goto bail; + } + } + + ret = 1; + +bail: + mlog_exit(ret); + + return ret; +} + +struct dentry_operations ocfs2_dentry_ops = { + .d_revalidate = ocfs2_dentry_revalidate, +}; diff --git a/fs/ocfs2/dcache.h b/fs/ocfs2/dcache.h new file mode 100644 index 0000000..9007277 --- /dev/null +++ b/fs/ocfs2/dcache.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dcache.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_DCACHE_H +#define OCFS2_DCACHE_H + +extern struct dentry_operations ocfs2_dentry_ops; + +#endif /* OCFS2_DCACHE_H */ diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c new file mode 100644 index 0000000..856e20a --- /dev/null +++ b/fs/ocfs2/dir.c @@ -0,0 +1,618 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dir.c + * + * Creates, reads, walks and deletes directory-nodes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * Portions of this code from linux/fs/ext3/dir.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/dir.c + * + * Copyright (C) 1991, 1992 Linux Torvalds + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#define MLOG_MASK_PREFIX ML_NAMEI +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dir.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "namei.h" +#include "suballoc.h" +#include "uptodate.h" + +#include "buffer_head_io.h" + +static unsigned char ocfs2_filetype_table[] = { + DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK +}; + +static int ocfs2_extend_dir(struct ocfs2_super *osb, + struct inode *dir, + struct buffer_head *parent_fe_bh, + struct buffer_head **new_de_bh); +/* + * ocfs2_readdir() + * + */ +int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir) +{ + int error = 0; + unsigned long offset, blk; + int i, num, stored; + struct buffer_head * bh, * tmp; + struct ocfs2_dir_entry * de; + int err; + struct inode *inode = filp->f_dentry->d_inode; + struct super_block * sb = inode->i_sb; + int have_disk_lock = 0; + + mlog_entry("dirino=%"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + stored = 0; + bh = NULL; + + error = ocfs2_meta_lock(inode, NULL, NULL, 0); + if (error < 0) { + if (error != -ENOENT) + mlog_errno(error); + /* we haven't got any yet, so propagate the error. */ + stored = error; + goto bail; + } + have_disk_lock = 1; + + offset = filp->f_pos & (sb->s_blocksize - 1); + + while (!error && !stored && filp->f_pos < i_size_read(inode)) { + blk = (filp->f_pos) >> sb->s_blocksize_bits; + bh = ocfs2_bread(inode, blk, &err, 0); + if (!bh) { + mlog(ML_ERROR, "directory #%"MLFu64" contains a hole " + "at offset %lld\n", + OCFS2_I(inode)->ip_blkno, + filp->f_pos); + filp->f_pos += sb->s_blocksize - offset; + continue; + } + + /* + * Do the readahead (8k) + */ + if (!offset) { + for (i = 16 >> (sb->s_blocksize_bits - 9), num = 0; + i > 0; i--) { + tmp = ocfs2_bread(inode, ++blk, &err, 1); + if (tmp) + brelse(tmp); + } + } + +revalidate: + /* If the dir block has changed since the last call to + * readdir(2), then we might be pointing to an invalid + * dirent right now. Scan from the start of the block + * to make sure. */ + if (filp->f_version != inode->i_version) { + for (i = 0; i < sb->s_blocksize && i < offset; ) { + de = (struct ocfs2_dir_entry *) (bh->b_data + i); + /* It's too expensive to do a full + * dirent test each time round this + * loop, but we do have to test at + * least that it is non-zero. A + * failure will be detected in the + * dirent test below. */ + if (le16_to_cpu(de->rec_len) < + OCFS2_DIR_REC_LEN(1)) + break; + i += le16_to_cpu(de->rec_len); + } + offset = i; + filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) + | offset; + filp->f_version = inode->i_version; + } + + while (!error && filp->f_pos < i_size_read(inode) + && offset < sb->s_blocksize) { + de = (struct ocfs2_dir_entry *) (bh->b_data + offset); + if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { + /* On error, skip the f_pos to the + next block. */ + filp->f_pos = (filp->f_pos | + (sb->s_blocksize - 1)) + 1; + brelse(bh); + goto bail; + } + offset += le16_to_cpu(de->rec_len); + if (le64_to_cpu(de->inode)) { + /* We might block in the next section + * if the data destination is + * currently swapped out. So, use a + * version stamp to detect whether or + * not the directory has been modified + * during the copy operation. + */ + unsigned long version = filp->f_version; + unsigned char d_type = DT_UNKNOWN; + + if (de->file_type < OCFS2_FT_MAX) + d_type = ocfs2_filetype_table[de->file_type]; + error = filldir(dirent, de->name, + de->name_len, + filp->f_pos, + ino_from_blkno(sb, le64_to_cpu(de->inode)), + d_type); + if (error) + break; + if (version != filp->f_version) + goto revalidate; + stored ++; + } + filp->f_pos += le16_to_cpu(de->rec_len); + } + offset = 0; + brelse(bh); + } + + stored = 0; +bail: + if (have_disk_lock) + ocfs2_meta_unlock(inode, 0); + + mlog_exit(stored); + + return stored; +} + +/* + * NOTE: this should always be called with parent dir i_sem taken. + */ +int ocfs2_find_files_on_disk(const char *name, + int namelen, + u64 *blkno, + struct inode *inode, + struct buffer_head **dirent_bh, + struct ocfs2_dir_entry **dirent) +{ + int status = -ENOENT; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + mlog_entry("(osb=%p, parent=%"MLFu64", name='%.*s', blkno=%p, " + "inode=%p)\n", + osb, OCFS2_I(inode)->ip_blkno, namelen, name, blkno, inode); + + *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent); + if (!*dirent_bh || !*dirent) { + status = -ENOENT; + goto leave; + } + + *blkno = le64_to_cpu((*dirent)->inode); + + status = 0; +leave: + if (status < 0) { + *dirent = NULL; + if (*dirent_bh) { + brelse(*dirent_bh); + *dirent_bh = NULL; + } + } + + mlog_exit(status); + return status; +} + +/* Check for a name within a directory. + * + * Return 0 if the name does not exist + * Return -EEXIST if the directory contains the name + * + * Callers should have i_sem + a cluster lock on dir + */ +int ocfs2_check_dir_for_entry(struct inode *dir, + const char *name, + int namelen) +{ + int ret; + struct buffer_head *dirent_bh = NULL; + struct ocfs2_dir_entry *dirent = NULL; + + mlog_entry("dir %"MLFu64", name '%.*s'\n", OCFS2_I(dir)->ip_blkno, + namelen, name); + + ret = -EEXIST; + dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent); + if (dirent_bh) + goto bail; + + ret = 0; +bail: + if (dirent_bh) + brelse(dirent_bh); + + mlog_exit(ret); + return ret; +} + +/* + * routine to check that the specified directory is empty (for rmdir) + */ +int ocfs2_empty_dir(struct inode *inode) +{ + unsigned long offset; + struct buffer_head * bh; + struct ocfs2_dir_entry * de, * de1; + struct super_block * sb; + int err; + + sb = inode->i_sb; + if ((i_size_read(inode) < + (OCFS2_DIR_REC_LEN(1) + OCFS2_DIR_REC_LEN(2))) || + !(bh = ocfs2_bread(inode, 0, &err, 0))) { + mlog(ML_ERROR, "bad directory (dir #%"MLFu64") - " + "no data block\n", + OCFS2_I(inode)->ip_blkno); + return 1; + } + + de = (struct ocfs2_dir_entry *) bh->b_data; + de1 = (struct ocfs2_dir_entry *) + ((char *)de + le16_to_cpu(de->rec_len)); + if ((le64_to_cpu(de->inode) != OCFS2_I(inode)->ip_blkno) || + !le64_to_cpu(de1->inode) || + strcmp(".", de->name) || + strcmp("..", de1->name)) { + mlog(ML_ERROR, "bad directory (dir #%"MLFu64") - " + "no `.' or `..'\n", + OCFS2_I(inode)->ip_blkno); + brelse(bh); + return 1; + } + offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len); + de = (struct ocfs2_dir_entry *)((char *)de1 + le16_to_cpu(de1->rec_len)); + while (offset < i_size_read(inode) ) { + if (!bh || (void *)de >= (void *)(bh->b_data + sb->s_blocksize)) { + brelse(bh); + bh = ocfs2_bread(inode, + offset >> sb->s_blocksize_bits, &err, 0); + if (!bh) { + mlog(ML_ERROR, "directory #%"MLFu64" contains " + "a hole at offset %lu\n", + OCFS2_I(inode)->ip_blkno, offset); + offset += sb->s_blocksize; + continue; + } + de = (struct ocfs2_dir_entry *) bh->b_data; + } + if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { + brelse(bh); + return 1; + } + if (le64_to_cpu(de->inode)) { + brelse(bh); + return 0; + } + offset += le16_to_cpu(de->rec_len); + de = (struct ocfs2_dir_entry *) + ((char *)de + le16_to_cpu(de->rec_len)); + } + brelse(bh); + return 1; +} + +/* returns a bh of the 1st new block in the allocation. */ +int ocfs2_do_extend_dir(struct super_block *sb, + struct ocfs2_journal_handle *handle, + struct inode *dir, + struct buffer_head *parent_fe_bh, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head **new_bh) +{ + int status; + int extend; + u64 p_blkno; + + spin_lock(&OCFS2_I(dir)->ip_lock); + extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); + spin_unlock(&OCFS2_I(dir)->ip_lock); + + if (extend) { + status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, 1, + parent_fe_bh, handle, + data_ac, meta_ac, NULL); + BUG_ON(status == -EAGAIN); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_extent_map_get_blocks(dir, (dir->i_blocks >> + (sb->s_blocksize_bits - 9)), + 1, &p_blkno, NULL); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + *new_bh = sb_getblk(sb, p_blkno); + if (!*new_bh) { + status = -EIO; + mlog_errno(status); + goto bail; + } + status = 0; +bail: + mlog_exit(status); + return status; +} + +/* assumes you already have a cluster lock on the directory. */ +static int ocfs2_extend_dir(struct ocfs2_super *osb, + struct inode *dir, + struct buffer_head *parent_fe_bh, + struct buffer_head **new_de_bh) +{ + int status = 0; + int credits, num_free_extents; + loff_t dir_i_size; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + struct ocfs2_alloc_context *data_ac = NULL; + struct ocfs2_alloc_context *meta_ac = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct buffer_head *new_bh = NULL; + struct ocfs2_dir_entry * de; + struct super_block *sb = osb->sb; + + mlog_entry_void(); + + dir_i_size = i_size_read(dir); + mlog(0, "extending dir %"MLFu64" (i_size = %lld)\n", + OCFS2_I(dir)->ip_blkno, dir_i_size); + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* dir->i_size is always block aligned. */ + spin_lock(&OCFS2_I(dir)->ip_lock); + if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { + spin_unlock(&OCFS2_I(dir)->ip_lock); + num_free_extents = ocfs2_num_free_extents(osb, dir, fe); + if (num_free_extents < 0) { + status = num_free_extents; + mlog_errno(status); + goto bail; + } + + if (!num_free_extents) { + status = ocfs2_reserve_new_metadata(osb, handle, + fe, &meta_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + credits = ocfs2_calc_extend_credits(sb, fe, 1); + } else { + spin_unlock(&OCFS2_I(dir)->ip_lock); + credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; + } + + handle = ocfs2_start_trans(osb, handle, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, + data_ac, meta_ac, &new_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_set_new_buffer_uptodate(dir, new_bh); + + status = ocfs2_journal_access(handle, dir, new_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + memset(new_bh->b_data, 0, sb->s_blocksize); + de = (struct ocfs2_dir_entry *) new_bh->b_data; + de->inode = 0; + de->rec_len = cpu_to_le16(sb->s_blocksize); + status = ocfs2_journal_dirty(handle, new_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + dir_i_size += dir->i_sb->s_blocksize; + i_size_write(dir, dir_i_size); + dir->i_blocks = ocfs2_align_bytes_to_sectors(dir_i_size); + status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + *new_de_bh = new_bh; + get_bh(*new_de_bh); +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if (meta_ac) + ocfs2_free_alloc_context(meta_ac); + + if (new_bh) + brelse(new_bh); + + mlog_exit(status); + return status; +} + +/* + * Search the dir for a good spot, extending it if necessary. The + * block containing an appropriate record is returned in ret_de_bh. + */ +int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, + struct inode *dir, + struct buffer_head *parent_fe_bh, + const char *name, + int namelen, + struct buffer_head **ret_de_bh) +{ + unsigned long offset; + struct buffer_head * bh = NULL; + unsigned short rec_len; + struct ocfs2_dinode *fe; + struct ocfs2_dir_entry *de; + struct super_block *sb; + int status; + + mlog_entry_void(); + + mlog(0, "getting ready to insert namelen %d into dir %"MLFu64"\n", + namelen, OCFS2_I(dir)->ip_blkno); + + BUG_ON(!S_ISDIR(dir->i_mode)); + fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir)); + + sb = dir->i_sb; + + if (!namelen) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + bh = ocfs2_bread(dir, 0, &status, 0); + if (!bh) { + mlog_errno(status); + goto bail; + } + + rec_len = OCFS2_DIR_REC_LEN(namelen); + offset = 0; + de = (struct ocfs2_dir_entry *) bh->b_data; + while (1) { + if ((char *)de >= sb->s_blocksize + bh->b_data) { + brelse(bh); + bh = NULL; + + if (i_size_read(dir) <= offset) { + status = ocfs2_extend_dir(osb, + dir, + parent_fe_bh, + &bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + BUG_ON(!bh); + *ret_de_bh = bh; + get_bh(*ret_de_bh); + goto bail; + } + bh = ocfs2_bread(dir, + offset >> sb->s_blocksize_bits, + &status, + 0); + if (!bh) { + mlog_errno(status); + goto bail; + } + /* move to next block */ + de = (struct ocfs2_dir_entry *) bh->b_data; + } + if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { + status = -ENOENT; + goto bail; + } + if (ocfs2_match(namelen, name, de)) { + status = -EEXIST; + goto bail; + } + if (((le64_to_cpu(de->inode) == 0) && + (le16_to_cpu(de->rec_len) >= rec_len)) || + (le16_to_cpu(de->rec_len) >= + (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { + /* Ok, we found a spot. Return this bh and let + * the caller actually fill it in. */ + *ret_de_bh = bh; + get_bh(*ret_de_bh); + status = 0; + goto bail; + } + offset += le16_to_cpu(de->rec_len); + de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); + } + + status = 0; +bail: + if (bh) + brelse(bh); + + mlog_exit(status); + return status; +} diff --git a/fs/ocfs2/dir.h b/fs/ocfs2/dir.h new file mode 100644 index 0000000..5f614ec --- /dev/null +++ b/fs/ocfs2/dir.h @@ -0,0 +1,54 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dir.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_DIR_H +#define OCFS2_DIR_H + +int ocfs2_check_dir_for_entry(struct inode *dir, + const char *name, + int namelen); +int ocfs2_empty_dir(struct inode *inode); /* FIXME: to namei.c */ +int ocfs2_find_files_on_disk(const char *name, + int namelen, + u64 *blkno, + struct inode *inode, + struct buffer_head **dirent_bh, + struct ocfs2_dir_entry **dirent); +int ocfs2_readdir(struct file *filp, void *dirent, filldir_t filldir); +int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, + struct inode *dir, + struct buffer_head *parent_fe_bh, + const char *name, + int namelen, + struct buffer_head **ret_de_bh); +struct ocfs2_alloc_context; +int ocfs2_do_extend_dir(struct super_block *sb, + struct ocfs2_journal_handle *handle, + struct inode *dir, + struct buffer_head *parent_fe_bh, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head **new_bh); +#endif /* OCFS2_DIR_H */ diff --git a/fs/ocfs2/dlm/Makefile b/fs/ocfs2/dlm/Makefile new file mode 100644 index 0000000..ce3f7c2 --- /dev/null +++ b/fs/ocfs2/dlm/Makefile @@ -0,0 +1,8 @@ +EXTRA_CFLAGS += -Ifs/ocfs2 + +obj-$(CONFIG_OCFS2_FS) += ocfs2_dlm.o ocfs2_dlmfs.o + +ocfs2_dlm-objs := dlmdomain.o dlmdebug.o dlmthread.o dlmrecovery.o \ + dlmmaster.o dlmast.o dlmconvert.o dlmlock.o dlmunlock.o dlmver.o + +ocfs2_dlmfs-objs := userdlm.o dlmfs.o dlmfsver.o diff --git a/fs/ocfs2/dlm/dlmapi.h b/fs/ocfs2/dlm/dlmapi.h new file mode 100644 index 0000000..53652f5 --- /dev/null +++ b/fs/ocfs2/dlm/dlmapi.h @@ -0,0 +1,214 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmapi.h + * + * externally exported dlm interfaces + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef DLMAPI_H +#define DLMAPI_H + +struct dlm_lock; +struct dlm_ctxt; + +/* NOTE: changes made to this enum should be reflected in dlmdebug.c */ +enum dlm_status { + DLM_NORMAL = 0, /* 0: request in progress */ + DLM_GRANTED, /* 1: request granted */ + DLM_DENIED, /* 2: request denied */ + DLM_DENIED_NOLOCKS, /* 3: request denied, out of system resources */ + DLM_WORKING, /* 4: async request in progress */ + DLM_BLOCKED, /* 5: lock request blocked */ + DLM_BLOCKED_ORPHAN, /* 6: lock request blocked by a orphan lock*/ + DLM_DENIED_GRACE_PERIOD, /* 7: topological change in progress */ + DLM_SYSERR, /* 8: system error */ + DLM_NOSUPPORT, /* 9: unsupported */ + DLM_CANCELGRANT, /* 10: can't cancel convert: already granted */ + DLM_IVLOCKID, /* 11: bad lockid */ + DLM_SYNC, /* 12: synchronous request granted */ + DLM_BADTYPE, /* 13: bad resource type */ + DLM_BADRESOURCE, /* 14: bad resource handle */ + DLM_MAXHANDLES, /* 15: no more resource handles */ + DLM_NOCLINFO, /* 16: can't contact cluster manager */ + DLM_NOLOCKMGR, /* 17: can't contact lock manager */ + DLM_NOPURGED, /* 18: can't contact purge daemon */ + DLM_BADARGS, /* 19: bad api args */ + DLM_VOID, /* 20: no status */ + DLM_NOTQUEUED, /* 21: NOQUEUE was specified and request failed */ + DLM_IVBUFLEN, /* 22: invalid resource name length */ + DLM_CVTUNGRANT, /* 23: attempted to convert ungranted lock */ + DLM_BADPARAM, /* 24: invalid lock mode specified */ + DLM_VALNOTVALID, /* 25: value block has been invalidated */ + DLM_REJECTED, /* 26: request rejected, unrecognized client */ + DLM_ABORT, /* 27: blocked lock request cancelled */ + DLM_CANCEL, /* 28: conversion request cancelled */ + DLM_IVRESHANDLE, /* 29: invalid resource handle */ + DLM_DEADLOCK, /* 30: deadlock recovery refused this request */ + DLM_DENIED_NOASTS, /* 31: failed to allocate AST */ + DLM_FORWARD, /* 32: request must wait for primary's response */ + DLM_TIMEOUT, /* 33: timeout value for lock has expired */ + DLM_IVGROUPID, /* 34: invalid group specification */ + DLM_VERS_CONFLICT, /* 35: version conflicts prevent request handling */ + DLM_BAD_DEVICE_PATH, /* 36: Locks device does not exist or path wrong */ + DLM_NO_DEVICE_PERMISSION, /* 37: Client has insufficient pers for device */ + DLM_NO_CONTROL_DEVICE, /* 38: Cannot set options on opened device */ + + DLM_RECOVERING, /* 39: extension, allows caller to fail a lock + request if it is being recovered */ + DLM_MIGRATING, /* 40: extension, allows caller to fail a lock + request if it is being migrated */ + DLM_MAXSTATS, /* 41: upper limit for return code validation */ +}; + +/* for pretty-printing dlm_status error messages */ +const char *dlm_errmsg(enum dlm_status err); +/* for pretty-printing dlm_status error names */ +const char *dlm_errname(enum dlm_status err); + +/* Eventually the DLM will use standard errno values, but in the + * meantime this lets us track dlm errors as they bubble up. When we + * bring its error reporting into line with the rest of the stack, + * these can just be replaced with calls to mlog_errno. */ +#define dlm_error(st) do { \ + if ((st) != DLM_RECOVERING && \ + (st) != DLM_MIGRATING && \ + (st) != DLM_FORWARD) \ + mlog(ML_ERROR, "dlm status = %s\n", dlm_errname((st))); \ +} while (0) + +#define DLM_LKSB_UNUSED1 0x01 +#define DLM_LKSB_PUT_LVB 0x02 +#define DLM_LKSB_GET_LVB 0x04 +#define DLM_LKSB_UNUSED2 0x08 +#define DLM_LKSB_UNUSED3 0x10 +#define DLM_LKSB_UNUSED4 0x20 +#define DLM_LKSB_UNUSED5 0x40 +#define DLM_LKSB_UNUSED6 0x80 + +#define DLM_LVB_LEN 64 + +/* Callers are only allowed access to the lvb and status members of + * this struct. */ +struct dlm_lockstatus { + enum dlm_status status; + u32 flags; + struct dlm_lock *lockid; + char lvb[DLM_LVB_LEN]; +}; + +/* Valid lock modes. */ +#define LKM_IVMODE (-1) /* invalid mode */ +#define LKM_NLMODE 0 /* null lock */ +#define LKM_CRMODE 1 /* concurrent read unsupported */ +#define LKM_CWMODE 2 /* concurrent write unsupported */ +#define LKM_PRMODE 3 /* protected read */ +#define LKM_PWMODE 4 /* protected write unsupported */ +#define LKM_EXMODE 5 /* exclusive */ +#define LKM_MAXMODE 5 +#define LKM_MODEMASK 0xff + +/* Flags passed to dlmlock and dlmunlock: + * reserved: flags used by the "real" dlm + * only a few are supported by this dlm + * (U) = unsupported by ocfs2 dlm */ +#define LKM_ORPHAN 0x00000010 /* this lock is orphanable (U) */ +#define LKM_PARENTABLE 0x00000020 /* this lock was orphaned (U) */ +#define LKM_BLOCK 0x00000040 /* blocking lock request (U) */ +#define LKM_LOCAL 0x00000080 /* local lock request */ +#define LKM_VALBLK 0x00000100 /* lock value block request */ +#define LKM_NOQUEUE 0x00000200 /* non blocking request */ +#define LKM_CONVERT 0x00000400 /* conversion request */ +#define LKM_NODLCKWT 0x00000800 /* this lock wont deadlock (U) */ +#define LKM_UNLOCK 0x00001000 /* deallocate this lock */ +#define LKM_CANCEL 0x00002000 /* cancel conversion request */ +#define LKM_DEQALL 0x00004000 /* remove all locks held by proc (U) */ +#define LKM_INVVALBLK 0x00008000 /* invalidate lock value block */ +#define LKM_SYNCSTS 0x00010000 /* return synchronous status if poss (U) */ +#define LKM_TIMEOUT 0x00020000 /* lock request contains timeout (U) */ +#define LKM_SNGLDLCK 0x00040000 /* request can self-deadlock (U) */ +#define LKM_FINDLOCAL 0x00080000 /* find local lock request (U) */ +#define LKM_PROC_OWNED 0x00100000 /* owned by process, not group (U) */ +#define LKM_XID 0x00200000 /* use transaction id for deadlock (U) */ +#define LKM_XID_CONFLICT 0x00400000 /* do not allow lock inheritance (U) */ +#define LKM_FORCE 0x00800000 /* force unlock flag */ +#define LKM_REVVALBLK 0x01000000 /* temporary solution: re-validate + lock value block (U) */ +/* unused */ +#define LKM_UNUSED1 0x00000001 /* unused */ +#define LKM_UNUSED2 0x00000002 /* unused */ +#define LKM_UNUSED3 0x00000004 /* unused */ +#define LKM_UNUSED4 0x00000008 /* unused */ +#define LKM_UNUSED5 0x02000000 /* unused */ +#define LKM_UNUSED6 0x04000000 /* unused */ +#define LKM_UNUSED7 0x08000000 /* unused */ + +/* ocfs2 extensions: internal only + * should never be used by caller */ +#define LKM_MIGRATION 0x10000000 /* extension: lockres is to be migrated + to another node */ +#define LKM_PUT_LVB 0x20000000 /* extension: lvb is being passed + should be applied to lockres */ +#define LKM_GET_LVB 0x40000000 /* extension: lvb should be copied + from lockres when lock is granted */ +#define LKM_RECOVERY 0x80000000 /* extension: flag for recovery lock + used to avoid recovery rwsem */ + + +typedef void (dlm_astlockfunc_t)(void *); +typedef void (dlm_bastlockfunc_t)(void *, int); +typedef void (dlm_astunlockfunc_t)(void *, enum dlm_status); + +enum dlm_status dlmlock(struct dlm_ctxt *dlm, + int mode, + struct dlm_lockstatus *lksb, + int flags, + const char *name, + dlm_astlockfunc_t *ast, + void *data, + dlm_bastlockfunc_t *bast); + +enum dlm_status dlmunlock(struct dlm_ctxt *dlm, + struct dlm_lockstatus *lksb, + int flags, + dlm_astunlockfunc_t *unlockast, + void *data); + +struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key); + +void dlm_unregister_domain(struct dlm_ctxt *dlm); + +void dlm_print_one_lock(struct dlm_lock *lockid); + +typedef void (dlm_eviction_func)(int, void *); +struct dlm_eviction_cb { + struct list_head ec_item; + dlm_eviction_func *ec_func; + void *ec_data; +}; +void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, + dlm_eviction_func *f, + void *data); +void dlm_register_eviction_cb(struct dlm_ctxt *dlm, + struct dlm_eviction_cb *cb); +void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb); + +#endif /* DLMAPI_H */ diff --git a/fs/ocfs2/dlm/dlmast.c b/fs/ocfs2/dlm/dlmast.c new file mode 100644 index 0000000..8d17d28 --- /dev/null +++ b/fs/ocfs2/dlm/dlmast.c @@ -0,0 +1,466 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmast.c + * + * AST and BAST functionality for local and remote nodes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/spinlock.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" +#include "cluster/endian.h" + +#include "dlmapi.h" +#include "dlmcommon.h" + +#define MLOG_MASK_PREFIX ML_DLM +#include "cluster/masklog.h" + +static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock); +static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock); + +/* Should be called as an ast gets queued to see if the new + * lock level will obsolete a pending bast. + * For example, if dlm_thread queued a bast for an EX lock that + * was blocking another EX, but before sending the bast the + * lock owner downconverted to NL, the bast is now obsolete. + * Only the ast should be sent. + * This is needed because the lock and convert paths can queue + * asts out-of-band (not waiting for dlm_thread) in order to + * allow for LKM_NOQUEUE to get immediate responses. */ +static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + assert_spin_locked(&dlm->ast_lock); + assert_spin_locked(&lock->spinlock); + + if (lock->ml.highest_blocked == LKM_IVMODE) + return 0; + BUG_ON(lock->ml.highest_blocked == LKM_NLMODE); + + if (lock->bast_pending && + list_empty(&lock->bast_list)) + /* old bast already sent, ok */ + return 0; + + if (lock->ml.type == LKM_EXMODE) + /* EX blocks anything left, any bast still valid */ + return 0; + else if (lock->ml.type == LKM_NLMODE) + /* NL blocks nothing, no reason to send any bast, cancel it */ + return 1; + else if (lock->ml.highest_blocked != LKM_EXMODE) + /* PR only blocks EX */ + return 1; + + return 0; +} + +static void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + mlog_entry_void(); + + BUG_ON(!dlm); + BUG_ON(!lock); + + assert_spin_locked(&dlm->ast_lock); + if (!list_empty(&lock->ast_list)) { + mlog(ML_ERROR, "ast list not empty!! pending=%d, newlevel=%d\n", + lock->ast_pending, lock->ml.type); + BUG(); + } + BUG_ON(!list_empty(&lock->ast_list)); + if (lock->ast_pending) + mlog(0, "lock has an ast getting flushed right now\n"); + + /* putting lock on list, add a ref */ + dlm_lock_get(lock); + spin_lock(&lock->spinlock); + + /* check to see if this ast obsoletes the bast */ + if (dlm_should_cancel_bast(dlm, lock)) { + struct dlm_lock_resource *res = lock->lockres; + mlog(0, "%s: cancelling bast for %.*s\n", + dlm->name, res->lockname.len, res->lockname.name); + lock->bast_pending = 0; + list_del_init(&lock->bast_list); + lock->ml.highest_blocked = LKM_IVMODE; + /* removing lock from list, remove a ref. guaranteed + * this won't be the last ref because of the get above, + * so res->spinlock will not be taken here */ + dlm_lock_put(lock); + /* free up the reserved bast that we are cancelling. + * guaranteed that this will not be the last reserved + * ast because *both* an ast and a bast were reserved + * to get to this point. the res->spinlock will not be + * taken here */ + dlm_lockres_release_ast(dlm, res); + } + list_add_tail(&lock->ast_list, &dlm->pending_asts); + lock->ast_pending = 1; + spin_unlock(&lock->spinlock); +} + +void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + mlog_entry_void(); + + BUG_ON(!dlm); + BUG_ON(!lock); + + spin_lock(&dlm->ast_lock); + __dlm_queue_ast(dlm, lock); + spin_unlock(&dlm->ast_lock); +} + + +static void __dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + mlog_entry_void(); + + BUG_ON(!dlm); + BUG_ON(!lock); + assert_spin_locked(&dlm->ast_lock); + + BUG_ON(!list_empty(&lock->bast_list)); + if (lock->bast_pending) + mlog(0, "lock has a bast getting flushed right now\n"); + + /* putting lock on list, add a ref */ + dlm_lock_get(lock); + spin_lock(&lock->spinlock); + list_add_tail(&lock->bast_list, &dlm->pending_basts); + lock->bast_pending = 1; + spin_unlock(&lock->spinlock); +} + +void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + mlog_entry_void(); + + BUG_ON(!dlm); + BUG_ON(!lock); + + spin_lock(&dlm->ast_lock); + __dlm_queue_bast(dlm, lock); + spin_unlock(&dlm->ast_lock); +} + +static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + struct dlm_lockstatus *lksb = lock->lksb; + BUG_ON(!lksb); + + /* only updates if this node masters the lockres */ + if (res->owner == dlm->node_num) { + + spin_lock(&res->spinlock); + /* check the lksb flags for the direction */ + if (lksb->flags & DLM_LKSB_GET_LVB) { + mlog(0, "getting lvb from lockres for %s node\n", + lock->ml.node == dlm->node_num ? "master" : + "remote"); + memcpy(lksb->lvb, res->lvb, DLM_LVB_LEN); + } else if (lksb->flags & DLM_LKSB_PUT_LVB) { + mlog(0, "setting lvb from lockres for %s node\n", + lock->ml.node == dlm->node_num ? "master" : + "remote"); + memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); + } + spin_unlock(&res->spinlock); + } + + /* reset any lvb flags on the lksb */ + lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); +} + +void dlm_do_local_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + dlm_astlockfunc_t *fn; + struct dlm_lockstatus *lksb; + + mlog_entry_void(); + + lksb = lock->lksb; + fn = lock->ast; + BUG_ON(lock->ml.node != dlm->node_num); + + dlm_update_lvb(dlm, res, lock); + (*fn)(lock->astdata); +} + + +int dlm_do_remote_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + int ret; + struct dlm_lockstatus *lksb; + int lksbflags; + + mlog_entry_void(); + + lksb = lock->lksb; + BUG_ON(lock->ml.node == dlm->node_num); + + lksbflags = lksb->flags; + dlm_update_lvb(dlm, res, lock); + + /* lock request came from another node + * go do the ast over there */ + ret = dlm_send_proxy_ast(dlm, res, lock, lksbflags); + return ret; +} + +void dlm_do_local_bast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock, int blocked_type) +{ + dlm_bastlockfunc_t *fn = lock->bast; + + mlog_entry_void(); + BUG_ON(lock->ml.node != dlm->node_num); + + (*fn)(lock->astdata, blocked_type); +} + + + +int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data) +{ + int ret; + unsigned int locklen; + struct dlm_ctxt *dlm = data; + struct dlm_lock_resource *res = NULL; + struct dlm_lock *lock = NULL; + struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf; + char *name; + struct list_head *iter, *head=NULL; + u64 cookie; + u32 flags; + + if (!dlm_grab(dlm)) { + dlm_error(DLM_REJECTED); + return DLM_REJECTED; + } + + mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), + "Domain %s not fully joined!\n", dlm->name); + + name = past->name; + locklen = past->namelen; + cookie = be64_to_cpu(past->cookie); + flags = be32_to_cpu(past->flags); + + if (locklen > DLM_LOCKID_NAME_MAX) { + ret = DLM_IVBUFLEN; + mlog(ML_ERROR, "Invalid name length in proxy ast handler!\n"); + goto leave; + } + + if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) == + (LKM_PUT_LVB|LKM_GET_LVB)) { + mlog(ML_ERROR, "both PUT and GET lvb specified\n"); + ret = DLM_BADARGS; + goto leave; + } + + mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : + (flags & LKM_GET_LVB ? "get lvb" : "none")); + + mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type); + + if (past->type != DLM_AST && + past->type != DLM_BAST) { + mlog(ML_ERROR, "Unknown ast type! %d, cookie=%"MLFu64", " + "name=%.*s\n", past->type, cookie, locklen, name); + ret = DLM_IVLOCKID; + goto leave; + } + + res = dlm_lookup_lockres(dlm, name, locklen); + if (!res) { + mlog(ML_ERROR, "got %sast for unknown lockres! " + "cookie=%"MLFu64", name=%.*s, namelen=%u\n", + past->type == DLM_AST ? "" : "b", + cookie, locklen, name, locklen); + ret = DLM_IVLOCKID; + goto leave; + } + + /* cannot get a proxy ast message if this node owns it */ + BUG_ON(res->owner == dlm->node_num); + + mlog(0, "lockres %.*s\n", res->lockname.len, res->lockname.name); + + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + mlog(0, "responding with DLM_RECOVERING!\n"); + ret = DLM_RECOVERING; + goto unlock_out; + } + if (res->state & DLM_LOCK_RES_MIGRATING) { + mlog(0, "responding with DLM_MIGRATING!\n"); + ret = DLM_MIGRATING; + goto unlock_out; + } + /* try convert queue for both ast/bast */ + head = &res->converting; + lock = NULL; + list_for_each(iter, head) { + lock = list_entry (iter, struct dlm_lock, list); + if (be64_to_cpu(lock->ml.cookie) == cookie) + goto do_ast; + } + + /* if not on convert, try blocked for ast, granted for bast */ + if (past->type == DLM_AST) + head = &res->blocked; + else + head = &res->granted; + + list_for_each(iter, head) { + lock = list_entry (iter, struct dlm_lock, list); + if (be64_to_cpu(lock->ml.cookie) == cookie) + goto do_ast; + } + + mlog(ML_ERROR, "got %sast for unknown lock! cookie=%"MLFu64", " + "name=%.*s, namelen=%u\n", + past->type == DLM_AST ? "" : "b", cookie, locklen, name, locklen); + + ret = DLM_NORMAL; +unlock_out: + spin_unlock(&res->spinlock); + goto leave; + +do_ast: + ret = DLM_NORMAL; + if (past->type == DLM_AST) { + /* do not alter lock refcount. switching lists. */ + list_del_init(&lock->list); + list_add_tail(&lock->list, &res->granted); + mlog(0, "ast: adding to granted list... type=%d, " + "convert_type=%d\n", lock->ml.type, lock->ml.convert_type); + if (lock->ml.convert_type != LKM_IVMODE) { + lock->ml.type = lock->ml.convert_type; + lock->ml.convert_type = LKM_IVMODE; + } else { + // should already be there.... + } + + lock->lksb->status = DLM_NORMAL; + + /* if we requested the lvb, fetch it into our lksb now */ + if (flags & LKM_GET_LVB) { + BUG_ON(!(lock->lksb->flags & DLM_LKSB_GET_LVB)); + memcpy(lock->lksb->lvb, past->lvb, DLM_LVB_LEN); + } + } + spin_unlock(&res->spinlock); + + if (past->type == DLM_AST) + dlm_do_local_ast(dlm, res, lock); + else + dlm_do_local_bast(dlm, res, lock, past->blocked_type); + +leave: + + if (res) + dlm_lockres_put(res); + + dlm_put(dlm); + return ret; +} + + + +int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_lock *lock, int msg_type, + int blocked_type, int flags) +{ + int ret = 0; + struct dlm_proxy_ast past; + struct kvec vec[2]; + size_t veclen = 1; + int status; + + mlog_entry("res %.*s, to=%u, type=%d, blocked_type=%d\n", + res->lockname.len, res->lockname.name, lock->ml.node, + msg_type, blocked_type); + + memset(&past, 0, sizeof(struct dlm_proxy_ast)); + past.node_idx = dlm->node_num; + past.type = msg_type; + past.blocked_type = blocked_type; + past.namelen = res->lockname.len; + memcpy(past.name, res->lockname.name, past.namelen); + past.cookie = lock->ml.cookie; + + vec[0].iov_len = sizeof(struct dlm_proxy_ast); + vec[0].iov_base = &past; + if (flags & DLM_LKSB_GET_LVB) { + mlog(0, "returning requested LVB data\n"); + be32_add_cpu(&past.flags, LKM_GET_LVB); + vec[1].iov_len = DLM_LVB_LEN; + vec[1].iov_base = lock->lksb->lvb; + veclen++; + } + + ret = o2net_send_message_vec(DLM_PROXY_AST_MSG, dlm->key, vec, veclen, + lock->ml.node, &status); + if (ret < 0) + mlog_errno(ret); + else { + if (status == DLM_RECOVERING) { + mlog(ML_ERROR, "sent AST to node %u, it thinks this " + "node is dead!\n", lock->ml.node); + BUG(); + } else if (status == DLM_MIGRATING) { + mlog(ML_ERROR, "sent AST to node %u, it returned " + "DLM_MIGRATING!\n", lock->ml.node); + BUG(); + } else if (status != DLM_NORMAL) { + mlog(ML_ERROR, "AST to node %u returned %d!\n", + lock->ml.node, status); + /* ignore it */ + } + ret = 0; + } + return ret; +} diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h new file mode 100644 index 0000000..3fecba0 --- /dev/null +++ b/fs/ocfs2/dlm/dlmcommon.h @@ -0,0 +1,884 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmcommon.h + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef DLMCOMMON_H +#define DLMCOMMON_H + +#include <linux/kref.h> + +#define DLM_HB_NODE_DOWN_PRI (0xf000000) +#define DLM_HB_NODE_UP_PRI (0x8000000) + +#define DLM_LOCKID_NAME_MAX 32 + +#define DLM_DOMAIN_NAME_MAX_LEN 255 +#define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES +#define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes +#define DLM_THREAD_MS 200 // flush at least every 200 ms + +#define DLM_HASH_BITS 7 +#define DLM_HASH_SIZE (1 << DLM_HASH_BITS) +#define DLM_HASH_MASK (DLM_HASH_SIZE - 1) + +enum dlm_ast_type { + DLM_AST = 0, + DLM_BAST, + DLM_ASTUNLOCK +}; + + +#define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \ + LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \ + LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE) + +#define DLM_RECOVERY_LOCK_NAME "$RECOVERY" +#define DLM_RECOVERY_LOCK_NAME_LEN 9 + +static inline int dlm_is_recovery_lock(const char *lock_name, int name_len) +{ + if (name_len == DLM_RECOVERY_LOCK_NAME_LEN && + memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0) + return 1; + return 0; +} + +#define DLM_RECO_STATE_ACTIVE 0x0001 + +struct dlm_recovery_ctxt +{ + struct list_head resources; + struct list_head received; + struct list_head node_data; + u8 new_master; + u8 dead_node; + u16 state; + unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + wait_queue_head_t event; +}; + +enum dlm_ctxt_state { + DLM_CTXT_NEW = 0, + DLM_CTXT_JOINED, + DLM_CTXT_IN_SHUTDOWN, + DLM_CTXT_LEAVING, +}; + +struct dlm_ctxt +{ + struct list_head list; + struct list_head *resources; + struct list_head dirty_list; + struct list_head purge_list; + struct list_head pending_asts; + struct list_head pending_basts; + unsigned int purge_count; + spinlock_t spinlock; + spinlock_t ast_lock; + char *name; + u8 node_num; + u32 key; + u8 joining_node; + wait_queue_head_t dlm_join_events; + unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + struct dlm_recovery_ctxt reco; + spinlock_t master_lock; + struct list_head master_list; + struct list_head mle_hb_events; + + /* these give a really vague idea of the system load */ + atomic_t local_resources; + atomic_t remote_resources; + atomic_t unknown_resources; + + /* NOTE: Next three are protected by dlm_domain_lock */ + struct kref dlm_refs; + enum dlm_ctxt_state dlm_state; + unsigned int num_joins; + + struct o2hb_callback_func dlm_hb_up; + struct o2hb_callback_func dlm_hb_down; + struct task_struct *dlm_thread_task; + struct task_struct *dlm_reco_thread_task; + wait_queue_head_t dlm_thread_wq; + wait_queue_head_t dlm_reco_thread_wq; + wait_queue_head_t ast_wq; + wait_queue_head_t migration_wq; + + struct work_struct dispatched_work; + struct list_head work_list; + spinlock_t work_lock; + struct list_head dlm_domain_handlers; + struct list_head dlm_eviction_callbacks; +}; + +/* these keventd work queue items are for less-frequently + * called functions that cannot be directly called from the + * net message handlers for some reason, usually because + * they need to send net messages of their own. */ +void dlm_dispatch_work(void *data); + +struct dlm_lock_resource; +struct dlm_work_item; + +typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *); + +struct dlm_request_all_locks_priv +{ + u8 reco_master; + u8 dead_node; +}; + +struct dlm_mig_lockres_priv +{ + struct dlm_lock_resource *lockres; + u8 real_master; +}; + +struct dlm_assert_master_priv +{ + struct dlm_lock_resource *lockres; + u8 request_from; + u32 flags; + unsigned ignore_higher:1; +}; + + +struct dlm_work_item +{ + struct list_head list; + dlm_workfunc_t *func; + struct dlm_ctxt *dlm; + void *data; + union { + struct dlm_request_all_locks_priv ral; + struct dlm_mig_lockres_priv ml; + struct dlm_assert_master_priv am; + } u; +}; + +static inline void dlm_init_work_item(struct dlm_ctxt *dlm, + struct dlm_work_item *i, + dlm_workfunc_t *f, void *data) +{ + memset(i, 0, sizeof(*i)); + i->func = f; + INIT_LIST_HEAD(&i->list); + i->data = data; + i->dlm = dlm; /* must have already done a dlm_grab on this! */ +} + + + +static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm, + u8 node) +{ + assert_spin_locked(&dlm->spinlock); + + dlm->joining_node = node; + wake_up(&dlm->dlm_join_events); +} + +#define DLM_LOCK_RES_UNINITED 0x00000001 +#define DLM_LOCK_RES_RECOVERING 0x00000002 +#define DLM_LOCK_RES_READY 0x00000004 +#define DLM_LOCK_RES_DIRTY 0x00000008 +#define DLM_LOCK_RES_IN_PROGRESS 0x00000010 +#define DLM_LOCK_RES_MIGRATING 0x00000020 + +#define DLM_PURGE_INTERVAL_MS (8 * 1000) + +struct dlm_lock_resource +{ + /* WARNING: Please see the comment in dlm_init_lockres before + * adding fields here. */ + struct list_head list; + struct kref refs; + + /* please keep these next 3 in this order + * some funcs want to iterate over all lists */ + struct list_head granted; + struct list_head converting; + struct list_head blocked; + + struct list_head dirty; + struct list_head recovering; // dlm_recovery_ctxt.resources list + + /* unused lock resources have their last_used stamped and are + * put on a list for the dlm thread to run. */ + struct list_head purge; + unsigned long last_used; + + unsigned migration_pending:1; + atomic_t asts_reserved; + spinlock_t spinlock; + wait_queue_head_t wq; + u8 owner; //node which owns the lock resource, or unknown + u16 state; + struct qstr lockname; + char lvb[DLM_LVB_LEN]; +}; + +struct dlm_migratable_lock +{ + __be64 cookie; + + /* these 3 are just padding for the in-memory structure, but + * list and flags are actually used when sent over the wire */ + __be16 pad1; + u8 list; // 0=granted, 1=converting, 2=blocked + u8 flags; + + s8 type; + s8 convert_type; + s8 highest_blocked; + u8 node; +}; // 16 bytes + +struct dlm_lock +{ + struct dlm_migratable_lock ml; + + struct list_head list; + struct list_head ast_list; + struct list_head bast_list; + struct dlm_lock_resource *lockres; + spinlock_t spinlock; + struct kref lock_refs; + + // ast and bast must be callable while holding a spinlock! + dlm_astlockfunc_t *ast; + dlm_bastlockfunc_t *bast; + void *astdata; + struct dlm_lockstatus *lksb; + unsigned ast_pending:1, + bast_pending:1, + convert_pending:1, + lock_pending:1, + cancel_pending:1, + unlock_pending:1, + lksb_kernel_allocated:1; +}; + + +#define DLM_LKSB_UNUSED1 0x01 +#define DLM_LKSB_PUT_LVB 0x02 +#define DLM_LKSB_GET_LVB 0x04 +#define DLM_LKSB_UNUSED2 0x08 +#define DLM_LKSB_UNUSED3 0x10 +#define DLM_LKSB_UNUSED4 0x20 +#define DLM_LKSB_UNUSED5 0x40 +#define DLM_LKSB_UNUSED6 0x80 + + +enum dlm_lockres_list { + DLM_GRANTED_LIST = 0, + DLM_CONVERTING_LIST, + DLM_BLOCKED_LIST +}; + +static inline struct list_head * +dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx) +{ + struct list_head *ret = NULL; + if (idx == DLM_GRANTED_LIST) + ret = &res->granted; + else if (idx == DLM_CONVERTING_LIST) + ret = &res->converting; + else if (idx == DLM_BLOCKED_LIST) + ret = &res->blocked; + else + BUG(); + return ret; +} + + + + +struct dlm_node_iter +{ + unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + int curnode; +}; + + +enum { + DLM_MASTER_REQUEST_MSG = 500, + DLM_UNUSED_MSG1, /* 501 */ + DLM_ASSERT_MASTER_MSG, /* 502 */ + DLM_CREATE_LOCK_MSG, /* 503 */ + DLM_CONVERT_LOCK_MSG, /* 504 */ + DLM_PROXY_AST_MSG, /* 505 */ + DLM_UNLOCK_LOCK_MSG, /* 506 */ + DLM_UNUSED_MSG2, /* 507 */ + DLM_MIGRATE_REQUEST_MSG, /* 508 */ + DLM_MIG_LOCKRES_MSG, /* 509 */ + DLM_QUERY_JOIN_MSG, /* 510 */ + DLM_ASSERT_JOINED_MSG, /* 511 */ + DLM_CANCEL_JOIN_MSG, /* 512 */ + DLM_EXIT_DOMAIN_MSG, /* 513 */ + DLM_MASTER_REQUERY_MSG, /* 514 */ + DLM_LOCK_REQUEST_MSG, /* 515 */ + DLM_RECO_DATA_DONE_MSG, /* 516 */ + DLM_BEGIN_RECO_MSG, /* 517 */ + DLM_FINALIZE_RECO_MSG /* 518 */ +}; + +struct dlm_reco_node_data +{ + int state; + u8 node_num; + struct list_head list; +}; + +enum { + DLM_RECO_NODE_DATA_DEAD = -1, + DLM_RECO_NODE_DATA_INIT = 0, + DLM_RECO_NODE_DATA_REQUESTING, + DLM_RECO_NODE_DATA_REQUESTED, + DLM_RECO_NODE_DATA_RECEIVING, + DLM_RECO_NODE_DATA_DONE, + DLM_RECO_NODE_DATA_FINALIZE_SENT, +}; + + +enum { + DLM_MASTER_RESP_NO = 0, + DLM_MASTER_RESP_YES, + DLM_MASTER_RESP_MAYBE, + DLM_MASTER_RESP_ERROR +}; + + +struct dlm_master_request +{ + u8 node_idx; + u8 namelen; + __be16 pad1; + __be32 flags; + + u8 name[O2NM_MAX_NAME_LEN]; +}; + +#define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001 +#define DLM_ASSERT_MASTER_REQUERY 0x00000002 +#define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004 +struct dlm_assert_master +{ + u8 node_idx; + u8 namelen; + __be16 pad1; + __be32 flags; + + u8 name[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_migrate_request +{ + u8 master; + u8 new_master; + u8 namelen; + u8 pad1; + __be32 pad2; + u8 name[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_master_requery +{ + u8 pad1; + u8 pad2; + u8 node_idx; + u8 namelen; + __be32 pad3; + u8 name[O2NM_MAX_NAME_LEN]; +}; + +#define DLM_MRES_RECOVERY 0x01 +#define DLM_MRES_MIGRATION 0x02 +#define DLM_MRES_ALL_DONE 0x04 + +/* + * We would like to get one whole lockres into a single network + * message whenever possible. Generally speaking, there will be + * at most one dlm_lock on a lockres for each node in the cluster, + * plus (infrequently) any additional locks coming in from userdlm. + * + * struct _dlm_lockres_page + * { + * dlm_migratable_lockres mres; + * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS]; + * u8 pad[DLM_MIG_LOCKRES_RESERVED]; + * }; + * + * from ../cluster/tcp.h + * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg)) + * (roughly 4080 bytes) + * and sizeof(dlm_migratable_lockres) = 112 bytes + * and sizeof(dlm_migratable_lock) = 16 bytes + * + * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and + * DLM_MIG_LOCKRES_RESERVED=128 means we have this: + * + * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) + + * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED = + * NET_MAX_PAYLOAD_BYTES + * (240 * 16) + 112 + 128 = 4080 + * + * So a lockres would need more than 240 locks before it would + * use more than one network packet to recover. Not too bad. + */ +#define DLM_MAX_MIGRATABLE_LOCKS 240 + +struct dlm_migratable_lockres +{ + u8 master; + u8 lockname_len; + u8 num_locks; // locks sent in this structure + u8 flags; + __be32 total_locks; // locks to be sent for this migration cookie + __be64 mig_cookie; // cookie for this lockres migration + // or zero if not needed + // 16 bytes + u8 lockname[DLM_LOCKID_NAME_MAX]; + // 48 bytes + u8 lvb[DLM_LVB_LEN]; + // 112 bytes + struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112 +}; +#define DLM_MIG_LOCKRES_MAX_LEN \ + (sizeof(struct dlm_migratable_lockres) + \ + (sizeof(struct dlm_migratable_lock) * \ + DLM_MAX_MIGRATABLE_LOCKS) ) + +/* from above, 128 bytes + * for some undetermined future use */ +#define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \ + DLM_MIG_LOCKRES_MAX_LEN) + +struct dlm_create_lock +{ + __be64 cookie; + + __be32 flags; + u8 pad1; + u8 node_idx; + s8 requested_type; + u8 namelen; + + u8 name[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_convert_lock +{ + __be64 cookie; + + __be32 flags; + u8 pad1; + u8 node_idx; + s8 requested_type; + u8 namelen; + + u8 name[O2NM_MAX_NAME_LEN]; + + s8 lvb[0]; +}; +#define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN) + +struct dlm_unlock_lock +{ + __be64 cookie; + + __be32 flags; + __be16 pad1; + u8 node_idx; + u8 namelen; + + u8 name[O2NM_MAX_NAME_LEN]; + + s8 lvb[0]; +}; +#define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN) + +struct dlm_proxy_ast +{ + __be64 cookie; + + __be32 flags; + u8 node_idx; + u8 type; + u8 blocked_type; + u8 namelen; + + u8 name[O2NM_MAX_NAME_LEN]; + + s8 lvb[0]; +}; +#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN) + +#define DLM_MOD_KEY (0x666c6172) +enum dlm_query_join_response { + JOIN_DISALLOW = 0, + JOIN_OK, + JOIN_OK_NO_MAP, +}; + +struct dlm_lock_request +{ + u8 node_idx; + u8 dead_node; + __be16 pad1; + __be32 pad2; +}; + +struct dlm_reco_data_done +{ + u8 node_idx; + u8 dead_node; + __be16 pad1; + __be32 pad2; + + /* unused for now */ + /* eventually we can use this to attempt + * lvb recovery based on each node's info */ + u8 reco_lvb[DLM_LVB_LEN]; +}; + +struct dlm_begin_reco +{ + u8 node_idx; + u8 dead_node; + __be16 pad1; + __be32 pad2; +}; + + +struct dlm_query_join_request +{ + u8 node_idx; + u8 pad1[2]; + u8 name_len; + u8 domain[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_assert_joined +{ + u8 node_idx; + u8 pad1[2]; + u8 name_len; + u8 domain[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_cancel_join +{ + u8 node_idx; + u8 pad1[2]; + u8 name_len; + u8 domain[O2NM_MAX_NAME_LEN]; +}; + +struct dlm_exit_domain +{ + u8 node_idx; + u8 pad1[3]; +}; + +struct dlm_finalize_reco +{ + u8 node_idx; + u8 dead_node; + __be16 pad1; + __be32 pad2; +}; + +static inline enum dlm_status +__dlm_lockres_state_to_status(struct dlm_lock_resource *res) +{ + enum dlm_status status = DLM_NORMAL; + + assert_spin_locked(&res->spinlock); + + if (res->state & DLM_LOCK_RES_RECOVERING) + status = DLM_RECOVERING; + else if (res->state & DLM_LOCK_RES_MIGRATING) + status = DLM_MIGRATING; + else if (res->state & DLM_LOCK_RES_IN_PROGRESS) + status = DLM_FORWARD; + + return status; +} + +struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, + struct dlm_lockstatus *lksb); +void dlm_lock_get(struct dlm_lock *lock); +void dlm_lock_put(struct dlm_lock *lock); + +void dlm_lock_attach_lockres(struct dlm_lock *lock, + struct dlm_lock_resource *res); + +int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data); + +void dlm_revert_pending_convert(struct dlm_lock_resource *res, + struct dlm_lock *lock); +void dlm_revert_pending_lock(struct dlm_lock_resource *res, + struct dlm_lock *lock); + +int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data); +void dlm_commit_pending_cancel(struct dlm_lock_resource *res, + struct dlm_lock *lock); +void dlm_commit_pending_unlock(struct dlm_lock_resource *res, + struct dlm_lock *lock); + +int dlm_launch_thread(struct dlm_ctxt *dlm); +void dlm_complete_thread(struct dlm_ctxt *dlm); +int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); +void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); +void dlm_wait_for_recovery(struct dlm_ctxt *dlm); + +void dlm_put(struct dlm_ctxt *dlm); +struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm); +int dlm_domain_fully_joined(struct dlm_ctxt *dlm); + +void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +void dlm_lockres_calc_usage(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +void dlm_purge_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *lockres); +void dlm_lockres_get(struct dlm_lock_resource *res); +void dlm_lockres_put(struct dlm_lock_resource *res); +void __dlm_unhash_lockres(struct dlm_lock_resource *res); +void __dlm_insert_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int len); +struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int len); + +int dlm_is_host_down(int errno); +void dlm_change_lockres_owner(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 owner); +struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm, + const char *lockid, + int flags); +struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int namelen); + +void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock); +void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock); +void dlm_do_local_ast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock); +int dlm_do_remote_ast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock); +void dlm_do_local_bast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + int blocked_type); +int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + int msg_type, + int blocked_type, int flags); +static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + int blocked_type) +{ + return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST, + blocked_type, 0); +} + +static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + int flags) +{ + return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST, + 0, flags); +} + +void dlm_print_one_lock_resource(struct dlm_lock_resource *res); +void __dlm_print_one_lock_resource(struct dlm_lock_resource *res); + +u8 dlm_nm_this_node(struct dlm_ctxt *dlm); +void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); +void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); + + +int dlm_nm_init(struct dlm_ctxt *dlm); +int dlm_heartbeat_init(struct dlm_ctxt *dlm); +void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data); +void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data); + +int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); +int dlm_migrate_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 target); +int dlm_finish_migration(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 old_master); +void dlm_lockres_release_ast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res); + +int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data); +int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data); + +int dlm_dispatch_assert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + int ignore_higher, + u8 request_from, + u32 flags); + + +int dlm_send_one_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_migratable_lockres *mres, + u8 send_to, + u8 flags); +void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); + +/* will exit holding res->spinlock, but may drop in function */ +void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags); +void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags); + +/* will exit holding res->spinlock, but may drop in function */ +static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res) +{ + __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS| + DLM_LOCK_RES_RECOVERING| + DLM_LOCK_RES_MIGRATING)); +} + + +int dlm_init_mle_cache(void); +void dlm_destroy_mle_cache(void); +void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up); +void dlm_clean_master_list(struct dlm_ctxt *dlm, + u8 dead_node); +int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock); + + +static inline const char * dlm_lock_mode_name(int mode) +{ + switch (mode) { + case LKM_EXMODE: + return "EX"; + case LKM_PRMODE: + return "PR"; + case LKM_NLMODE: + return "NL"; + } + return "UNKNOWN"; +} + + +static inline int dlm_lock_compatible(int existing, int request) +{ + /* NO_LOCK compatible with all */ + if (request == LKM_NLMODE || + existing == LKM_NLMODE) + return 1; + + /* EX incompatible with all non-NO_LOCK */ + if (request == LKM_EXMODE) + return 0; + + /* request must be PR, which is compatible with PR */ + if (existing == LKM_PRMODE) + return 1; + + return 0; +} + +static inline int dlm_lock_on_list(struct list_head *head, + struct dlm_lock *lock) +{ + struct list_head *iter; + struct dlm_lock *tmplock; + + list_for_each(iter, head) { + tmplock = list_entry(iter, struct dlm_lock, list); + if (tmplock == lock) + return 1; + } + return 0; +} + + +static inline enum dlm_status dlm_err_to_dlm_status(int err) +{ + enum dlm_status ret; + if (err == -ENOMEM) + ret = DLM_SYSERR; + else if (err == -ETIMEDOUT || o2net_link_down(err, NULL)) + ret = DLM_NOLOCKMGR; + else if (err == -EINVAL) + ret = DLM_BADPARAM; + else if (err == -ENAMETOOLONG) + ret = DLM_IVBUFLEN; + else + ret = DLM_BADARGS; + return ret; +} + + +static inline void dlm_node_iter_init(unsigned long *map, + struct dlm_node_iter *iter) +{ + memcpy(iter->node_map, map, sizeof(iter->node_map)); + iter->curnode = -1; +} + +static inline int dlm_node_iter_next(struct dlm_node_iter *iter) +{ + int bit; + bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1); + if (bit >= O2NM_MAX_NODES) { + iter->curnode = O2NM_MAX_NODES; + return -ENOENT; + } + iter->curnode = bit; + return bit; +} + + + +#endif /* DLMCOMMON_H */ diff --git a/fs/ocfs2/dlm/dlmconvert.c b/fs/ocfs2/dlm/dlmconvert.c new file mode 100644 index 0000000..6001b22 --- /dev/null +++ b/fs/ocfs2/dlm/dlmconvert.c @@ -0,0 +1,530 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmconvert.c + * + * underlying calls for lock conversion + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/spinlock.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" + +#include "dlmconvert.h" + +#define MLOG_MASK_PREFIX ML_DLM +#include "cluster/masklog.h" + +/* NOTE: __dlmconvert_master is the only function in here that + * needs a spinlock held on entry (res->spinlock) and it is the + * only one that holds a lock on exit (res->spinlock). + * All other functions in here need no locks and drop all of + * the locks that they acquire. */ +static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, + int type, int *call_ast, + int *kick_thread); +static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type); + +/* + * this is only called directly by dlmlock(), and only when the + * local node is the owner of the lockres + * locking: + * caller needs: none + * taken: takes and drops res->spinlock + * held on exit: none + * returns: see __dlmconvert_master + */ +enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type) +{ + int call_ast = 0, kick_thread = 0; + enum dlm_status status; + + spin_lock(&res->spinlock); + /* we are not in a network handler, this is fine */ + __dlm_wait_on_lockres(res); + __dlm_lockres_reserve_ast(res); + res->state |= DLM_LOCK_RES_IN_PROGRESS; + + status = __dlmconvert_master(dlm, res, lock, flags, type, + &call_ast, &kick_thread); + + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + spin_unlock(&res->spinlock); + wake_up(&res->wq); + if (status != DLM_NORMAL && status != DLM_NOTQUEUED) + dlm_error(status); + + /* either queue the ast or release it */ + if (call_ast) + dlm_queue_ast(dlm, lock); + else + dlm_lockres_release_ast(dlm, res); + + if (kick_thread) + dlm_kick_thread(dlm, res); + + return status; +} + +/* performs lock conversion at the lockres master site + * locking: + * caller needs: res->spinlock + * taken: takes and drops lock->spinlock + * held on exit: res->spinlock + * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED + * call_ast: whether ast should be called for this lock + * kick_thread: whether dlm_kick_thread should be called + */ +static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, + int type, int *call_ast, + int *kick_thread) +{ + enum dlm_status status = DLM_NORMAL; + struct list_head *iter; + struct dlm_lock *tmplock=NULL; + + assert_spin_locked(&res->spinlock); + + mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n", + lock->ml.type, lock->ml.convert_type, type); + + spin_lock(&lock->spinlock); + + /* already converting? */ + if (lock->ml.convert_type != LKM_IVMODE) { + mlog(ML_ERROR, "attempted to convert a lock with a lock " + "conversion pending\n"); + status = DLM_DENIED; + goto unlock_exit; + } + + /* must be on grant queue to convert */ + if (!dlm_lock_on_list(&res->granted, lock)) { + mlog(ML_ERROR, "attempted to convert a lock not on grant " + "queue\n"); + status = DLM_DENIED; + goto unlock_exit; + } + + if (flags & LKM_VALBLK) { + switch (lock->ml.type) { + case LKM_EXMODE: + /* EX + LKM_VALBLK + convert == set lvb */ + mlog(0, "will set lvb: converting %s->%s\n", + dlm_lock_mode_name(lock->ml.type), + dlm_lock_mode_name(type)); + lock->lksb->flags |= DLM_LKSB_PUT_LVB; + break; + case LKM_PRMODE: + case LKM_NLMODE: + /* refetch if new level is not NL */ + if (type > LKM_NLMODE) { + mlog(0, "will fetch new value into " + "lvb: converting %s->%s\n", + dlm_lock_mode_name(lock->ml.type), + dlm_lock_mode_name(type)); + lock->lksb->flags |= DLM_LKSB_GET_LVB; + } else { + mlog(0, "will NOT fetch new value " + "into lvb: converting %s->%s\n", + dlm_lock_mode_name(lock->ml.type), + dlm_lock_mode_name(type)); + flags &= ~(LKM_VALBLK); + } + break; + } + } + + + /* in-place downconvert? */ + if (type <= lock->ml.type) + goto grant; + + /* upconvert from here on */ + status = DLM_NORMAL; + list_for_each(iter, &res->granted) { + tmplock = list_entry(iter, struct dlm_lock, list); + if (tmplock == lock) + continue; + if (!dlm_lock_compatible(tmplock->ml.type, type)) + goto switch_queues; + } + + list_for_each(iter, &res->converting) { + tmplock = list_entry(iter, struct dlm_lock, list); + if (!dlm_lock_compatible(tmplock->ml.type, type)) + goto switch_queues; + /* existing conversion requests take precedence */ + if (!dlm_lock_compatible(tmplock->ml.convert_type, type)) + goto switch_queues; + } + + /* fall thru to grant */ + +grant: + mlog(0, "res %.*s, granting %s lock\n", res->lockname.len, + res->lockname.name, dlm_lock_mode_name(type)); + /* immediately grant the new lock type */ + lock->lksb->status = DLM_NORMAL; + if (lock->ml.node == dlm->node_num) + mlog(0, "doing in-place convert for nonlocal lock\n"); + lock->ml.type = type; + status = DLM_NORMAL; + *call_ast = 1; + goto unlock_exit; + +switch_queues: + if (flags & LKM_NOQUEUE) { + mlog(0, "failed to convert NOQUEUE lock %.*s from " + "%d to %d...\n", res->lockname.len, res->lockname.name, + lock->ml.type, type); + status = DLM_NOTQUEUED; + goto unlock_exit; + } + mlog(0, "res %.*s, queueing...\n", res->lockname.len, + res->lockname.name); + + lock->ml.convert_type = type; + /* do not alter lock refcount. switching lists. */ + list_del_init(&lock->list); + list_add_tail(&lock->list, &res->converting); + +unlock_exit: + spin_unlock(&lock->spinlock); + if (status == DLM_DENIED) { + __dlm_print_one_lock_resource(res); + } + if (status == DLM_NORMAL) + *kick_thread = 1; + return status; +} + +void dlm_revert_pending_convert(struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + /* do not alter lock refcount. switching lists. */ + list_del_init(&lock->list); + list_add_tail(&lock->list, &res->granted); + lock->ml.convert_type = LKM_IVMODE; + lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); +} + +/* messages the master site to do lock conversion + * locking: + * caller needs: none + * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS + * held on exit: none + * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node + */ +enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type) +{ + enum dlm_status status; + + mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type, + lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS); + + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + mlog(0, "bailing out early since res is RECOVERING " + "on secondary queue\n"); + /* __dlm_print_one_lock_resource(res); */ + status = DLM_RECOVERING; + goto bail; + } + /* will exit this call with spinlock held */ + __dlm_wait_on_lockres(res); + + if (lock->ml.convert_type != LKM_IVMODE) { + __dlm_print_one_lock_resource(res); + mlog(ML_ERROR, "converting a remote lock that is already " + "converting! (cookie=%"MLFu64", conv=%d)\n", + lock->ml.cookie, lock->ml.convert_type); + status = DLM_DENIED; + goto bail; + } + res->state |= DLM_LOCK_RES_IN_PROGRESS; + /* move lock to local convert queue */ + /* do not alter lock refcount. switching lists. */ + list_del_init(&lock->list); + list_add_tail(&lock->list, &res->converting); + lock->convert_pending = 1; + lock->ml.convert_type = type; + + if (flags & LKM_VALBLK) { + if (lock->ml.type == LKM_EXMODE) { + flags |= LKM_PUT_LVB; + lock->lksb->flags |= DLM_LKSB_PUT_LVB; + } else { + if (lock->ml.convert_type == LKM_NLMODE) + flags &= ~LKM_VALBLK; + else { + flags |= LKM_GET_LVB; + lock->lksb->flags |= DLM_LKSB_GET_LVB; + } + } + } + spin_unlock(&res->spinlock); + + /* no locks held here. + * need to wait for a reply as to whether it got queued or not. */ + status = dlm_send_remote_convert_request(dlm, res, lock, flags, type); + + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + lock->convert_pending = 0; + /* if it failed, move it back to granted queue */ + if (status != DLM_NORMAL) { + if (status != DLM_NOTQUEUED) + dlm_error(status); + dlm_revert_pending_convert(res, lock); + } +bail: + spin_unlock(&res->spinlock); + + /* TODO: should this be a wake_one? */ + /* wake up any IN_PROGRESS waiters */ + wake_up(&res->wq); + + return status; +} + +/* sends DLM_CONVERT_LOCK_MSG to master site + * locking: + * caller needs: none + * taken: none + * held on exit: none + * returns: DLM_NOLOCKMGR, status from remote node + */ +static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type) +{ + struct dlm_convert_lock convert; + int tmpret; + enum dlm_status ret; + int status = 0; + struct kvec vec[2]; + size_t veclen = 1; + + mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); + + memset(&convert, 0, sizeof(struct dlm_convert_lock)); + convert.node_idx = dlm->node_num; + convert.requested_type = type; + convert.cookie = lock->ml.cookie; + convert.namelen = res->lockname.len; + convert.flags = cpu_to_be32(flags); + memcpy(convert.name, res->lockname.name, convert.namelen); + + vec[0].iov_len = sizeof(struct dlm_convert_lock); + vec[0].iov_base = &convert; + + if (flags & LKM_PUT_LVB) { + /* extra data to send if we are updating lvb */ + vec[1].iov_len = DLM_LVB_LEN; + vec[1].iov_base = lock->lksb->lvb; + veclen++; + } + + tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key, + vec, veclen, res->owner, &status); + if (tmpret >= 0) { + // successfully sent and received + ret = status; // this is already a dlm_status + if (ret == DLM_RECOVERING) { + mlog(0, "node %u returned DLM_RECOVERING from convert " + "message!\n", res->owner); + } else if (ret == DLM_MIGRATING) { + mlog(0, "node %u returned DLM_MIGRATING from convert " + "message!\n", res->owner); + } else if (ret == DLM_FORWARD) { + mlog(0, "node %u returned DLM_FORWARD from convert " + "message!\n", res->owner); + } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED) + dlm_error(ret); + } else { + mlog_errno(tmpret); + if (dlm_is_host_down(tmpret)) { + ret = DLM_RECOVERING; + mlog(0, "node %u died so returning DLM_RECOVERING " + "from convert message!\n", res->owner); + } else { + ret = dlm_err_to_dlm_status(tmpret); + } + } + + return ret; +} + +/* handler for DLM_CONVERT_LOCK_MSG on master site + * locking: + * caller needs: none + * taken: takes and drop res->spinlock + * held on exit: none + * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS, + * status from __dlmconvert_master + */ +int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf; + struct dlm_lock_resource *res = NULL; + struct list_head *iter; + struct dlm_lock *lock = NULL; + struct dlm_lockstatus *lksb; + enum dlm_status status = DLM_NORMAL; + u32 flags; + int call_ast = 0, kick_thread = 0; + + if (!dlm_grab(dlm)) { + dlm_error(DLM_REJECTED); + return DLM_REJECTED; + } + + mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), + "Domain %s not fully joined!\n", dlm->name); + + if (cnv->namelen > DLM_LOCKID_NAME_MAX) { + status = DLM_IVBUFLEN; + dlm_error(status); + goto leave; + } + + flags = be32_to_cpu(cnv->flags); + + if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) == + (LKM_PUT_LVB|LKM_GET_LVB)) { + mlog(ML_ERROR, "both PUT and GET lvb specified\n"); + status = DLM_BADARGS; + goto leave; + } + + mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : + (flags & LKM_GET_LVB ? "get lvb" : "none")); + + status = DLM_IVLOCKID; + res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen); + if (!res) { + dlm_error(status); + goto leave; + } + + spin_lock(&res->spinlock); + list_for_each(iter, &res->granted) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock->ml.cookie == cnv->cookie && + lock->ml.node == cnv->node_idx) { + dlm_lock_get(lock); + break; + } + lock = NULL; + } + spin_unlock(&res->spinlock); + if (!lock) { + status = DLM_IVLOCKID; + dlm_error(status); + goto leave; + } + + /* found the lock */ + lksb = lock->lksb; + + /* see if caller needed to get/put lvb */ + if (flags & LKM_PUT_LVB) { + BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); + lksb->flags |= DLM_LKSB_PUT_LVB; + memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN); + } else if (flags & LKM_GET_LVB) { + BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); + lksb->flags |= DLM_LKSB_GET_LVB; + } + + spin_lock(&res->spinlock); + status = __dlm_lockres_state_to_status(res); + if (status == DLM_NORMAL) { + __dlm_lockres_reserve_ast(res); + res->state |= DLM_LOCK_RES_IN_PROGRESS; + status = __dlmconvert_master(dlm, res, lock, flags, + cnv->requested_type, + &call_ast, &kick_thread); + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + } + spin_unlock(&res->spinlock); + + if (status != DLM_NORMAL) { + if (status != DLM_NOTQUEUED) + dlm_error(status); + lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); + } + +leave: + if (!lock) + mlog(ML_ERROR, "did not find lock to convert on grant queue! " + "cookie=%"MLFu64"\n", + cnv->cookie); + else + dlm_lock_put(lock); + + /* either queue the ast or release it */ + if (call_ast) + dlm_queue_ast(dlm, lock); + else + dlm_lockres_release_ast(dlm, res); + + if (kick_thread) + dlm_kick_thread(dlm, res); + + if (res) + dlm_lockres_put(res); + + dlm_put(dlm); + + return status; +} diff --git a/fs/ocfs2/dlm/dlmconvert.h b/fs/ocfs2/dlm/dlmconvert.h new file mode 100644 index 0000000..b2e3677 --- /dev/null +++ b/fs/ocfs2/dlm/dlmconvert.h @@ -0,0 +1,35 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmconvert.h + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef DLMCONVERT_H +#define DLMCONVERT_H + +enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type); +enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags, int type); + +#endif diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c new file mode 100644 index 0000000..f339fe27 --- /dev/null +++ b/fs/ocfs2/dlm/dlmdebug.c @@ -0,0 +1,246 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmdebug.c + * + * debug functionality for the dlm + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/sysctl.h> +#include <linux/spinlock.h> + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" +#include "dlmdebug.h" + +#include "dlmdomain.h" +#include "dlmdebug.h" + +#define MLOG_MASK_PREFIX ML_DLM +#include "cluster/masklog.h" + +void dlm_print_one_lock_resource(struct dlm_lock_resource *res) +{ + mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n", + res->lockname.len, res->lockname.name, + res->owner, res->state); + spin_lock(&res->spinlock); + __dlm_print_one_lock_resource(res); + spin_unlock(&res->spinlock); +} + +void __dlm_print_one_lock_resource(struct dlm_lock_resource *res) +{ + struct list_head *iter2; + struct dlm_lock *lock; + + assert_spin_locked(&res->spinlock); + + mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n", + res->lockname.len, res->lockname.name, + res->owner, res->state); + mlog(ML_NOTICE, " last used: %lu, on purge list: %s\n", + res->last_used, list_empty(&res->purge) ? "no" : "yes"); + mlog(ML_NOTICE, " granted queue: \n"); + list_for_each(iter2, &res->granted) { + lock = list_entry(iter2, struct dlm_lock, list); + spin_lock(&lock->spinlock); + mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, " + "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", + lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie, + list_empty(&lock->ast_list) ? 'y' : 'n', + lock->ast_pending ? 'y' : 'n', + list_empty(&lock->bast_list) ? 'y' : 'n', + lock->bast_pending ? 'y' : 'n'); + spin_unlock(&lock->spinlock); + } + mlog(ML_NOTICE, " converting queue: \n"); + list_for_each(iter2, &res->converting) { + lock = list_entry(iter2, struct dlm_lock, list); + spin_lock(&lock->spinlock); + mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, " + "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", + lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie, + list_empty(&lock->ast_list) ? 'y' : 'n', + lock->ast_pending ? 'y' : 'n', + list_empty(&lock->bast_list) ? 'y' : 'n', + lock->bast_pending ? 'y' : 'n'); + spin_unlock(&lock->spinlock); + } + mlog(ML_NOTICE, " blocked queue: \n"); + list_for_each(iter2, &res->blocked) { + lock = list_entry(iter2, struct dlm_lock, list); + spin_lock(&lock->spinlock); + mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, " + "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", + lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie, + list_empty(&lock->ast_list) ? 'y' : 'n', + lock->ast_pending ? 'y' : 'n', + list_empty(&lock->bast_list) ? 'y' : 'n', + lock->bast_pending ? 'y' : 'n'); + spin_unlock(&lock->spinlock); + } +} + +void dlm_print_one_lock(struct dlm_lock *lockid) +{ + dlm_print_one_lock_resource(lockid->lockres); +} +EXPORT_SYMBOL_GPL(dlm_print_one_lock); + +void dlm_dump_lock_resources(struct dlm_ctxt *dlm) +{ + struct dlm_lock_resource *res; + struct list_head *iter; + struct list_head *bucket; + int i; + + mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n", + dlm->name, dlm->node_num, dlm->key); + if (!dlm || !dlm->name) { + mlog(ML_ERROR, "dlm=%p\n", dlm); + return; + } + + spin_lock(&dlm->spinlock); + for (i=0; i<DLM_HASH_SIZE; i++) { + bucket = &(dlm->resources[i]); + list_for_each(iter, bucket) { + res = list_entry(iter, struct dlm_lock_resource, list); + dlm_print_one_lock_resource(res); + } + } + spin_unlock(&dlm->spinlock); +} + +static const char *dlm_errnames[] = { + [DLM_NORMAL] = "DLM_NORMAL", + [DLM_GRANTED] = "DLM_GRANTED", + [DLM_DENIED] = "DLM_DENIED", + [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS", + [DLM_WORKING] = "DLM_WORKING", + [DLM_BLOCKED] = "DLM_BLOCKED", + [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN", + [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD", + [DLM_SYSERR] = "DLM_SYSERR", + [DLM_NOSUPPORT] = "DLM_NOSUPPORT", + [DLM_CANCELGRANT] = "DLM_CANCELGRANT", + [DLM_IVLOCKID] = "DLM_IVLOCKID", + [DLM_SYNC] = "DLM_SYNC", + [DLM_BADTYPE] = "DLM_BADTYPE", + [DLM_BADRESOURCE] = "DLM_BADRESOURCE", + [DLM_MAXHANDLES] = "DLM_MAXHANDLES", + [DLM_NOCLINFO] = "DLM_NOCLINFO", + [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR", + [DLM_NOPURGED] = "DLM_NOPURGED", + [DLM_BADARGS] = "DLM_BADARGS", + [DLM_VOID] = "DLM_VOID", + [DLM_NOTQUEUED] = "DLM_NOTQUEUED", + [DLM_IVBUFLEN] = "DLM_IVBUFLEN", + [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT", + [DLM_BADPARAM] = "DLM_BADPARAM", + [DLM_VALNOTVALID] = "DLM_VALNOTVALID", + [DLM_REJECTED] = "DLM_REJECTED", + [DLM_ABORT] = "DLM_ABORT", + [DLM_CANCEL] = "DLM_CANCEL", + [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE", + [DLM_DEADLOCK] = "DLM_DEADLOCK", + [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS", + [DLM_FORWARD] = "DLM_FORWARD", + [DLM_TIMEOUT] = "DLM_TIMEOUT", + [DLM_IVGROUPID] = "DLM_IVGROUPID", + [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT", + [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH", + [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION", + [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ", + [DLM_RECOVERING] = "DLM_RECOVERING", + [DLM_MIGRATING] = "DLM_MIGRATING", + [DLM_MAXSTATS] = "DLM_MAXSTATS", +}; + +static const char *dlm_errmsgs[] = { + [DLM_NORMAL] = "request in progress", + [DLM_GRANTED] = "request granted", + [DLM_DENIED] = "request denied", + [DLM_DENIED_NOLOCKS] = "request denied, out of system resources", + [DLM_WORKING] = "async request in progress", + [DLM_BLOCKED] = "lock request blocked", + [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock", + [DLM_DENIED_GRACE_PERIOD] = "topological change in progress", + [DLM_SYSERR] = "system error", + [DLM_NOSUPPORT] = "unsupported", + [DLM_CANCELGRANT] = "can't cancel convert: already granted", + [DLM_IVLOCKID] = "bad lockid", + [DLM_SYNC] = "synchronous request granted", + [DLM_BADTYPE] = "bad resource type", + [DLM_BADRESOURCE] = "bad resource handle", + [DLM_MAXHANDLES] = "no more resource handles", + [DLM_NOCLINFO] = "can't contact cluster manager", + [DLM_NOLOCKMGR] = "can't contact lock manager", + [DLM_NOPURGED] = "can't contact purge daemon", + [DLM_BADARGS] = "bad api args", + [DLM_VOID] = "no status", + [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed", + [DLM_IVBUFLEN] = "invalid resource name length", + [DLM_CVTUNGRANT] = "attempted to convert ungranted lock", + [DLM_BADPARAM] = "invalid lock mode specified", + [DLM_VALNOTVALID] = "value block has been invalidated", + [DLM_REJECTED] = "request rejected, unrecognized client", + [DLM_ABORT] = "blocked lock request cancelled", + [DLM_CANCEL] = "conversion request cancelled", + [DLM_IVRESHANDLE] = "invalid resource handle", + [DLM_DEADLOCK] = "deadlock recovery refused this request", + [DLM_DENIED_NOASTS] = "failed to allocate AST", + [DLM_FORWARD] = "request must wait for primary's response", + [DLM_TIMEOUT] = "timeout value for lock has expired", + [DLM_IVGROUPID] = "invalid group specification", + [DLM_VERS_CONFLICT] = "version conflicts prevent request handling", + [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong", + [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device", + [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ", + [DLM_RECOVERING] = "lock resource being recovered", + [DLM_MIGRATING] = "lock resource being migrated", + [DLM_MAXSTATS] = "invalid error number", +}; + +const char *dlm_errmsg(enum dlm_status err) +{ + if (err >= DLM_MAXSTATS || err < 0) + return dlm_errmsgs[DLM_MAXSTATS]; + return dlm_errmsgs[err]; +} +EXPORT_SYMBOL_GPL(dlm_errmsg); + +const char *dlm_errname(enum dlm_status err) +{ + if (err >= DLM_MAXSTATS || err < 0) + return dlm_errnames[DLM_MAXSTATS]; + return dlm_errnames[err]; +} +EXPORT_SYMBOL_GPL(dlm_errname); diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h new file mode 100644 index 0000000..6858510 --- /dev/null +++ b/fs/ocfs2/dlm/dlmdebug.h @@ -0,0 +1,30 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmdebug.h + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef DLMDEBUG_H +#define DLMDEBUG_H + +void dlm_dump_lock_resources(struct dlm_ctxt *dlm); + +#endif diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c new file mode 100644 index 0000000..da3c220 --- /dev/null +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -0,0 +1,1469 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmdomain.c + * + * defines domain join / leave apis + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/err.h> + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" + +#include "dlmdebug.h" +#include "dlmdomain.h" + +#include "dlmver.h" + +#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN) +#include "cluster/masklog.h" + +/* + * + * spinlock lock ordering: if multiple locks are needed, obey this ordering: + * dlm_domain_lock + * struct dlm_ctxt->spinlock + * struct dlm_lock_resource->spinlock + * struct dlm_ctxt->master_lock + * struct dlm_ctxt->ast_lock + * dlm_master_list_entry->spinlock + * dlm_lock->spinlock + * + */ + +spinlock_t dlm_domain_lock = SPIN_LOCK_UNLOCKED; +LIST_HEAD(dlm_domains); +static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events); + +#define DLM_DOMAIN_BACKOFF_MS 200 + +static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data); +static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data); +static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data); +static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data); + +static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); + +void __dlm_unhash_lockres(struct dlm_lock_resource *lockres) +{ + list_del_init(&lockres->list); + dlm_lockres_put(lockres); +} + +void __dlm_insert_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + struct list_head *bucket; + struct qstr *q; + + assert_spin_locked(&dlm->spinlock); + + q = &res->lockname; + q->hash = full_name_hash(q->name, q->len); + bucket = &(dlm->resources[q->hash & DLM_HASH_MASK]); + + /* get a reference for our hashtable */ + dlm_lockres_get(res); + + list_add_tail(&res->list, bucket); +} + +struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int len) +{ + unsigned int hash; + struct list_head *iter; + struct dlm_lock_resource *tmpres=NULL; + struct list_head *bucket; + + mlog_entry("%.*s\n", len, name); + + assert_spin_locked(&dlm->spinlock); + + hash = full_name_hash(name, len); + + bucket = &(dlm->resources[hash & DLM_HASH_MASK]); + + /* check for pre-existing lock */ + list_for_each(iter, bucket) { + tmpres = list_entry(iter, struct dlm_lock_resource, list); + if (tmpres->lockname.len == len && + memcmp(tmpres->lockname.name, name, len) == 0) { + dlm_lockres_get(tmpres); + break; + } + + tmpres = NULL; + } + return tmpres; +} + +struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int len) +{ + struct dlm_lock_resource *res; + + spin_lock(&dlm->spinlock); + res = __dlm_lookup_lockres(dlm, name, len); + spin_unlock(&dlm->spinlock); + return res; +} + +static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) +{ + struct dlm_ctxt *tmp = NULL; + struct list_head *iter; + + assert_spin_locked(&dlm_domain_lock); + + /* tmp->name here is always NULL terminated, + * but domain may not be! */ + list_for_each(iter, &dlm_domains) { + tmp = list_entry (iter, struct dlm_ctxt, list); + if (strlen(tmp->name) == len && + memcmp(tmp->name, domain, len)==0) + break; + tmp = NULL; + } + + return tmp; +} + +/* For null terminated domain strings ONLY */ +static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) +{ + assert_spin_locked(&dlm_domain_lock); + + return __dlm_lookup_domain_full(domain, strlen(domain)); +} + + +/* returns true on one of two conditions: + * 1) the domain does not exist + * 2) the domain exists and it's state is "joined" */ +static int dlm_wait_on_domain_helper(const char *domain) +{ + int ret = 0; + struct dlm_ctxt *tmp = NULL; + + spin_lock(&dlm_domain_lock); + + tmp = __dlm_lookup_domain(domain); + if (!tmp) + ret = 1; + else if (tmp->dlm_state == DLM_CTXT_JOINED) + ret = 1; + + spin_unlock(&dlm_domain_lock); + return ret; +} + +static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) +{ + if (dlm->resources) + free_page((unsigned long) dlm->resources); + + if (dlm->name) + kfree(dlm->name); + + kfree(dlm); +} + +/* A little strange - this function will be called while holding + * dlm_domain_lock and is expected to be holding it on the way out. We + * will however drop and reacquire it multiple times */ +static void dlm_ctxt_release(struct kref *kref) +{ + struct dlm_ctxt *dlm; + + dlm = container_of(kref, struct dlm_ctxt, dlm_refs); + + BUG_ON(dlm->num_joins); + BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); + + /* we may still be in the list if we hit an error during join. */ + list_del_init(&dlm->list); + + spin_unlock(&dlm_domain_lock); + + mlog(0, "freeing memory from domain %s\n", dlm->name); + + wake_up(&dlm_domain_events); + + dlm_free_ctxt_mem(dlm); + + spin_lock(&dlm_domain_lock); +} + +void dlm_put(struct dlm_ctxt *dlm) +{ + spin_lock(&dlm_domain_lock); + kref_put(&dlm->dlm_refs, dlm_ctxt_release); + spin_unlock(&dlm_domain_lock); +} + +static void __dlm_get(struct dlm_ctxt *dlm) +{ + kref_get(&dlm->dlm_refs); +} + +/* given a questionable reference to a dlm object, gets a reference if + * it can find it in the list, otherwise returns NULL in which case + * you shouldn't trust your pointer. */ +struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) +{ + struct list_head *iter; + struct dlm_ctxt *target = NULL; + + spin_lock(&dlm_domain_lock); + + list_for_each(iter, &dlm_domains) { + target = list_entry (iter, struct dlm_ctxt, list); + + if (target == dlm) { + __dlm_get(target); + break; + } + + target = NULL; + } + + spin_unlock(&dlm_domain_lock); + + return target; +} + +int dlm_domain_fully_joined(struct dlm_ctxt *dlm) +{ + int ret; + + spin_lock(&dlm_domain_lock); + ret = (dlm->dlm_state == DLM_CTXT_JOINED) || + (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); + spin_unlock(&dlm_domain_lock); + + return ret; +} + +static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) +{ + dlm_unregister_domain_handlers(dlm); + dlm_complete_thread(dlm); + dlm_complete_recovery_thread(dlm); + + /* We've left the domain. Now we can take ourselves out of the + * list and allow the kref stuff to help us free the + * memory. */ + spin_lock(&dlm_domain_lock); + list_del_init(&dlm->list); + spin_unlock(&dlm_domain_lock); + + /* Wake up anyone waiting for us to remove this domain */ + wake_up(&dlm_domain_events); +} + +static void dlm_migrate_all_locks(struct dlm_ctxt *dlm) +{ + int i; + struct dlm_lock_resource *res; + + mlog(0, "Migrating locks from domain %s\n", dlm->name); +restart: + spin_lock(&dlm->spinlock); + for (i=0; i<DLM_HASH_SIZE; i++) { + while (!list_empty(&dlm->resources[i])) { + res = list_entry(dlm->resources[i].next, + struct dlm_lock_resource, list); + /* need reference when manually grabbing lockres */ + dlm_lockres_get(res); + /* this should unhash the lockres + * and exit with dlm->spinlock */ + mlog(0, "purging res=%p\n", res); + if (dlm_lockres_is_dirty(dlm, res)) { + /* HACK! this should absolutely go. + * need to figure out why some empty + * lockreses are still marked dirty */ + mlog(ML_ERROR, "lockres %.*s dirty!\n", + res->lockname.len, res->lockname.name); + + spin_unlock(&dlm->spinlock); + dlm_kick_thread(dlm, res); + wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res)); + dlm_lockres_put(res); + goto restart; + } + dlm_purge_lockres(dlm, res); + dlm_lockres_put(res); + } + } + spin_unlock(&dlm->spinlock); + + mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); +} + +static int dlm_no_joining_node(struct dlm_ctxt *dlm) +{ + int ret; + + spin_lock(&dlm->spinlock); + ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; + spin_unlock(&dlm->spinlock); + + return ret; +} + +static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) +{ + /* Yikes, a double spinlock! I need domain_lock for the dlm + * state and the dlm spinlock for join state... Sorry! */ +again: + spin_lock(&dlm_domain_lock); + spin_lock(&dlm->spinlock); + + if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "Node %d is joining, we wait on it.\n", + dlm->joining_node); + spin_unlock(&dlm->spinlock); + spin_unlock(&dlm_domain_lock); + + wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); + goto again; + } + + dlm->dlm_state = DLM_CTXT_LEAVING; + spin_unlock(&dlm->spinlock); + spin_unlock(&dlm_domain_lock); +} + +static void __dlm_print_nodes(struct dlm_ctxt *dlm) +{ + int node = -1; + + assert_spin_locked(&dlm->spinlock); + + mlog(ML_NOTICE, "Nodes in my domain (\"%s\"):\n", dlm->name); + + while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, + node + 1)) < O2NM_MAX_NODES) { + mlog(ML_NOTICE, " node %d\n", node); + } +} + +static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + unsigned int node; + struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; + + mlog_entry("%p %u %p", msg, len, data); + + if (!dlm_grab(dlm)) + return 0; + + node = exit_msg->node_idx; + + mlog(0, "Node %u leaves domain %s\n", node, dlm->name); + + spin_lock(&dlm->spinlock); + clear_bit(node, dlm->domain_map); + __dlm_print_nodes(dlm); + + /* notify anything attached to the heartbeat events */ + dlm_hb_event_notify_attached(dlm, node, 0); + + spin_unlock(&dlm->spinlock); + + dlm_put(dlm); + + return 0; +} + +static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, + unsigned int node) +{ + int status; + struct dlm_exit_domain leave_msg; + + mlog(0, "Asking node %u if we can leave the domain %s me = %u\n", + node, dlm->name, dlm->node_num); + + memset(&leave_msg, 0, sizeof(leave_msg)); + leave_msg.node_idx = dlm->node_num; + + status = o2net_send_message(DLM_EXIT_DOMAIN_MSG, dlm->key, + &leave_msg, sizeof(leave_msg), node, + NULL); + + mlog(0, "status return %d from o2net_send_message\n", status); + + return status; +} + + +static void dlm_leave_domain(struct dlm_ctxt *dlm) +{ + int node, clear_node, status; + + /* At this point we've migrated away all our locks and won't + * accept mastership of new ones. The dlm is responsible for + * almost nothing now. We make sure not to confuse any joining + * nodes and then commence shutdown procedure. */ + + spin_lock(&dlm->spinlock); + /* Clear ourselves from the domain map */ + clear_bit(dlm->node_num, dlm->domain_map); + while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, + 0)) < O2NM_MAX_NODES) { + /* Drop the dlm spinlock. This is safe wrt the domain_map. + * -nodes cannot be added now as the + * query_join_handlers knows to respond with OK_NO_MAP + * -we catch the right network errors if a node is + * removed from the map while we're sending him the + * exit message. */ + spin_unlock(&dlm->spinlock); + + clear_node = 1; + + status = dlm_send_one_domain_exit(dlm, node); + if (status < 0 && + status != -ENOPROTOOPT && + status != -ENOTCONN) { + mlog(ML_NOTICE, "Error %d sending domain exit message " + "to node %d\n", status, node); + + /* Not sure what to do here but lets sleep for + * a bit in case this was a transient + * error... */ + msleep(DLM_DOMAIN_BACKOFF_MS); + clear_node = 0; + } + + spin_lock(&dlm->spinlock); + /* If we're not clearing the node bit then we intend + * to loop back around to try again. */ + if (clear_node) + clear_bit(node, dlm->domain_map); + } + spin_unlock(&dlm->spinlock); +} + +int dlm_joined(struct dlm_ctxt *dlm) +{ + int ret = 0; + + spin_lock(&dlm_domain_lock); + + if (dlm->dlm_state == DLM_CTXT_JOINED) + ret = 1; + + spin_unlock(&dlm_domain_lock); + + return ret; +} + +int dlm_shutting_down(struct dlm_ctxt *dlm) +{ + int ret = 0; + + spin_lock(&dlm_domain_lock); + + if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) + ret = 1; + + spin_unlock(&dlm_domain_lock); + + return ret; +} + +void dlm_unregister_domain(struct dlm_ctxt *dlm) +{ + int leave = 0; + + spin_lock(&dlm_domain_lock); + BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); + BUG_ON(!dlm->num_joins); + + dlm->num_joins--; + if (!dlm->num_joins) { + /* We mark it "in shutdown" now so new register + * requests wait until we've completely left the + * domain. Don't use DLM_CTXT_LEAVING yet as we still + * want new domain joins to communicate with us at + * least until we've completed migration of our + * resources. */ + dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; + leave = 1; + } + spin_unlock(&dlm_domain_lock); + + if (leave) { + mlog(0, "shutting down domain %s\n", dlm->name); + + /* We changed dlm state, notify the thread */ + dlm_kick_thread(dlm, NULL); + + dlm_migrate_all_locks(dlm); + dlm_mark_domain_leaving(dlm); + dlm_leave_domain(dlm); + dlm_complete_dlm_shutdown(dlm); + } + dlm_put(dlm); +} +EXPORT_SYMBOL_GPL(dlm_unregister_domain); + +static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_query_join_request *query; + enum dlm_query_join_response response; + struct dlm_ctxt *dlm = NULL; + + query = (struct dlm_query_join_request *) msg->buf; + + mlog(0, "node %u wants to join domain %s\n", query->node_idx, + query->domain); + + /* + * If heartbeat doesn't consider the node live, tell it + * to back off and try again. This gives heartbeat a chance + * to catch up. + */ + if (!o2hb_check_node_heartbeating(query->node_idx)) { + mlog(0, "node %u is not in our live map yet\n", + query->node_idx); + + response = JOIN_DISALLOW; + goto respond; + } + + response = JOIN_OK_NO_MAP; + + spin_lock(&dlm_domain_lock); + dlm = __dlm_lookup_domain_full(query->domain, query->name_len); + /* Once the dlm ctxt is marked as leaving then we don't want + * to be put in someone's domain map. */ + if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) { + spin_lock(&dlm->spinlock); + + if (dlm->dlm_state == DLM_CTXT_NEW && + dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { + /*If this is a brand new context and we + * haven't started our join process yet, then + * the other node won the race. */ + response = JOIN_OK_NO_MAP; + } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { + /* Disallow parallel joins. */ + response = JOIN_DISALLOW; + } else { + /* Alright we're fully a part of this domain + * so we keep some state as to who's joining + * and indicate to him that needs to be fixed + * up. */ + response = JOIN_OK; + __dlm_set_joining_node(dlm, query->node_idx); + } + + spin_unlock(&dlm->spinlock); + } + spin_unlock(&dlm_domain_lock); + +respond: + mlog(0, "We respond with %u\n", response); + + return response; +} + +static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_assert_joined *assert; + struct dlm_ctxt *dlm = NULL; + + assert = (struct dlm_assert_joined *) msg->buf; + + mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, + assert->domain); + + spin_lock(&dlm_domain_lock); + dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); + /* XXX should we consider no dlm ctxt an error? */ + if (dlm) { + spin_lock(&dlm->spinlock); + + /* Alright, this node has officially joined our + * domain. Set him in the map and clean up our + * leftover join state. */ + BUG_ON(dlm->joining_node != assert->node_idx); + set_bit(assert->node_idx, dlm->domain_map); + __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); + + __dlm_print_nodes(dlm); + + /* notify anything attached to the heartbeat events */ + dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); + + spin_unlock(&dlm->spinlock); + } + spin_unlock(&dlm_domain_lock); + + return 0; +} + +static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_cancel_join *cancel; + struct dlm_ctxt *dlm = NULL; + + cancel = (struct dlm_cancel_join *) msg->buf; + + mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, + cancel->domain); + + spin_lock(&dlm_domain_lock); + dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); + + if (dlm) { + spin_lock(&dlm->spinlock); + + /* Yikes, this guy wants to cancel his join. No + * problem, we simply cleanup our join state. */ + BUG_ON(dlm->joining_node != cancel->node_idx); + __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); + + spin_unlock(&dlm->spinlock); + } + spin_unlock(&dlm_domain_lock); + + return 0; +} + +static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, + unsigned int node) +{ + int status; + struct dlm_cancel_join cancel_msg; + + memset(&cancel_msg, 0, sizeof(cancel_msg)); + cancel_msg.node_idx = dlm->node_num; + cancel_msg.name_len = strlen(dlm->name); + memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); + + status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, + &cancel_msg, sizeof(cancel_msg), node, + NULL); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + return status; +} + +/* map_size should be in bytes. */ +static int dlm_send_join_cancels(struct dlm_ctxt *dlm, + unsigned long *node_map, + unsigned int map_size) +{ + int status, tmpstat; + unsigned int node; + + if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * + sizeof(unsigned long))) { + mlog(ML_ERROR, + "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", + map_size, BITS_TO_LONGS(O2NM_MAX_NODES)); + return -EINVAL; + } + + status = 0; + node = -1; + while ((node = find_next_bit(node_map, O2NM_MAX_NODES, + node + 1)) < O2NM_MAX_NODES) { + if (node == dlm->node_num) + continue; + + tmpstat = dlm_send_one_join_cancel(dlm, node); + if (tmpstat) { + mlog(ML_ERROR, "Error return %d cancelling join on " + "node %d\n", tmpstat, node); + if (!status) + status = tmpstat; + } + } + + if (status) + mlog_errno(status); + return status; +} + +static int dlm_request_join(struct dlm_ctxt *dlm, + int node, + enum dlm_query_join_response *response) +{ + int status, retval; + struct dlm_query_join_request join_msg; + + mlog(0, "querying node %d\n", node); + + memset(&join_msg, 0, sizeof(join_msg)); + join_msg.node_idx = dlm->node_num; + join_msg.name_len = strlen(dlm->name); + memcpy(join_msg.domain, dlm->name, join_msg.name_len); + + status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, + sizeof(join_msg), node, &retval); + if (status < 0 && status != -ENOPROTOOPT) { + mlog_errno(status); + goto bail; + } + + /* -ENOPROTOOPT from the net code means the other side isn't + listening for our message type -- that's fine, it means + his dlm isn't up, so we can consider him a 'yes' but not + joined into the domain. */ + if (status == -ENOPROTOOPT) { + status = 0; + *response = JOIN_OK_NO_MAP; + } else if (retval == JOIN_DISALLOW || + retval == JOIN_OK || + retval == JOIN_OK_NO_MAP) { + *response = retval; + } else { + status = -EINVAL; + mlog(ML_ERROR, "invalid response %d from node %u\n", retval, + node); + } + + mlog(0, "status %d, node %d response is %d\n", status, node, + *response); + +bail: + return status; +} + +static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, + unsigned int node) +{ + int status; + struct dlm_assert_joined assert_msg; + + mlog(0, "Sending join assert to node %u\n", node); + + memset(&assert_msg, 0, sizeof(assert_msg)); + assert_msg.node_idx = dlm->node_num; + assert_msg.name_len = strlen(dlm->name); + memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); + + status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, + &assert_msg, sizeof(assert_msg), node, + NULL); + if (status < 0) + mlog_errno(status); + + return status; +} + +static void dlm_send_join_asserts(struct dlm_ctxt *dlm, + unsigned long *node_map) +{ + int status, node, live; + + status = 0; + node = -1; + while ((node = find_next_bit(node_map, O2NM_MAX_NODES, + node + 1)) < O2NM_MAX_NODES) { + if (node == dlm->node_num) + continue; + + do { + /* It is very important that this message be + * received so we spin until either the node + * has died or it gets the message. */ + status = dlm_send_one_join_assert(dlm, node); + + spin_lock(&dlm->spinlock); + live = test_bit(node, dlm->live_nodes_map); + spin_unlock(&dlm->spinlock); + + if (status) { + mlog(ML_ERROR, "Error return %d asserting " + "join on node %d\n", status, node); + + /* give us some time between errors... */ + if (live) + msleep(DLM_DOMAIN_BACKOFF_MS); + } + } while (status && live); + } +} + +struct domain_join_ctxt { + unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; +}; + +static int dlm_should_restart_join(struct dlm_ctxt *dlm, + struct domain_join_ctxt *ctxt, + enum dlm_query_join_response response) +{ + int ret; + + if (response == JOIN_DISALLOW) { + mlog(0, "Latest response of disallow -- should restart\n"); + return 1; + } + + spin_lock(&dlm->spinlock); + /* For now, we restart the process if the node maps have + * changed at all */ + ret = memcmp(ctxt->live_map, dlm->live_nodes_map, + sizeof(dlm->live_nodes_map)); + spin_unlock(&dlm->spinlock); + + if (ret) + mlog(0, "Node maps changed -- should restart\n"); + + return ret; +} + +static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) +{ + int status = 0, tmpstat, node; + struct domain_join_ctxt *ctxt; + enum dlm_query_join_response response; + + mlog_entry("%p", dlm); + + ctxt = kcalloc(1, sizeof(*ctxt), GFP_KERNEL); + if (!ctxt) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* group sem locking should work for us here -- we're already + * registered for heartbeat events so filling this should be + * atomic wrt getting those handlers called. */ + o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); + + spin_lock(&dlm->spinlock); + memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); + + __dlm_set_joining_node(dlm, dlm->node_num); + + spin_unlock(&dlm->spinlock); + + node = -1; + while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, + node + 1)) < O2NM_MAX_NODES) { + if (node == dlm->node_num) + continue; + + status = dlm_request_join(dlm, node, &response); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* Ok, either we got a response or the node doesn't have a + * dlm up. */ + if (response == JOIN_OK) + set_bit(node, ctxt->yes_resp_map); + + if (dlm_should_restart_join(dlm, ctxt, response)) { + status = -EAGAIN; + goto bail; + } + } + + mlog(0, "Yay, done querying nodes!\n"); + + /* Yay, everyone agree's we can join the domain. My domain is + * comprised of all nodes who were put in the + * yes_resp_map. Copy that into our domain map and send a join + * assert message to clean up everyone elses state. */ + spin_lock(&dlm->spinlock); + memcpy(dlm->domain_map, ctxt->yes_resp_map, + sizeof(ctxt->yes_resp_map)); + set_bit(dlm->node_num, dlm->domain_map); + spin_unlock(&dlm->spinlock); + + dlm_send_join_asserts(dlm, ctxt->yes_resp_map); + + /* Joined state *must* be set before the joining node + * information, otherwise the query_join handler may read no + * current joiner but a state of NEW and tell joining nodes + * we're not in the domain. */ + spin_lock(&dlm_domain_lock); + dlm->dlm_state = DLM_CTXT_JOINED; + dlm->num_joins++; + spin_unlock(&dlm_domain_lock); + +bail: + spin_lock(&dlm->spinlock); + __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); + if (!status) + __dlm_print_nodes(dlm); + spin_unlock(&dlm->spinlock); + + if (ctxt) { + /* Do we need to send a cancel message to any nodes? */ + if (status < 0) { + tmpstat = dlm_send_join_cancels(dlm, + ctxt->yes_resp_map, + sizeof(ctxt->yes_resp_map)); + if (tmpstat < 0) + mlog_errno(tmpstat); + } + kfree(ctxt); + } + + mlog(0, "returning %d\n", status); + return status; +} + +static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) +{ + o2hb_unregister_callback(&dlm->dlm_hb_up); + o2hb_unregister_callback(&dlm->dlm_hb_down); + o2net_unregister_handler_list(&dlm->dlm_domain_handlers); +} + +static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) +{ + int status; + + mlog(0, "registering handlers.\n"); + + o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, + dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); + status = o2hb_register_callback(&dlm->dlm_hb_down); + if (status) + goto bail; + + o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, + dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); + status = o2hb_register_callback(&dlm->dlm_hb_up); + if (status) + goto bail; + + status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, + sizeof(struct dlm_master_request), + dlm_master_request_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, + sizeof(struct dlm_assert_master), + dlm_assert_master_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, + sizeof(struct dlm_create_lock), + dlm_create_lock_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, + DLM_CONVERT_LOCK_MAX_LEN, + dlm_convert_lock_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key, + DLM_UNLOCK_LOCK_MAX_LEN, + dlm_unlock_lock_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key, + DLM_PROXY_AST_MAX_LEN, + dlm_proxy_ast_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, + sizeof(struct dlm_exit_domain), + dlm_exit_domain_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, + sizeof(struct dlm_migrate_request), + dlm_migrate_request_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, + DLM_MIG_LOCKRES_MAX_LEN, + dlm_mig_lockres_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, + sizeof(struct dlm_master_requery), + dlm_master_requery_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, + sizeof(struct dlm_lock_request), + dlm_request_all_locks_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, + sizeof(struct dlm_reco_data_done), + dlm_reco_data_done_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, + sizeof(struct dlm_begin_reco), + dlm_begin_reco_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, + sizeof(struct dlm_finalize_reco), + dlm_finalize_reco_handler, + dlm, &dlm->dlm_domain_handlers); + if (status) + goto bail; + +bail: + if (status) + dlm_unregister_domain_handlers(dlm); + + return status; +} + +static int dlm_join_domain(struct dlm_ctxt *dlm) +{ + int status; + + BUG_ON(!dlm); + + mlog(0, "Join domain %s\n", dlm->name); + + status = dlm_register_domain_handlers(dlm); + if (status) { + mlog_errno(status); + goto bail; + } + + status = dlm_launch_thread(dlm); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = dlm_launch_recovery_thread(dlm); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + do { + unsigned int backoff; + status = dlm_try_to_join_domain(dlm); + + /* If we're racing another node to the join, then we + * need to back off temporarily and let them + * complete. */ + if (status == -EAGAIN) { + if (signal_pending(current)) { + status = -ERESTARTSYS; + goto bail; + } + + /* + * <chip> After you! + * <dale> No, after you! + * <chip> I insist! + * <dale> But you first! + * ... + */ + backoff = (unsigned int)(jiffies & 0x3); + backoff *= DLM_DOMAIN_BACKOFF_MS; + mlog(0, "backoff %d\n", backoff); + msleep(backoff); + } + } while (status == -EAGAIN); + + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + wake_up(&dlm_domain_events); + + if (status) { + dlm_unregister_domain_handlers(dlm); + dlm_complete_thread(dlm); + dlm_complete_recovery_thread(dlm); + } + + return status; +} + +static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, + u32 key) +{ + int i; + struct dlm_ctxt *dlm = NULL; + + dlm = kcalloc(1, sizeof(*dlm), GFP_KERNEL); + if (!dlm) { + mlog_errno(-ENOMEM); + goto leave; + } + + dlm->name = kmalloc(strlen(domain) + 1, GFP_KERNEL); + if (dlm->name == NULL) { + mlog_errno(-ENOMEM); + kfree(dlm); + dlm = NULL; + goto leave; + } + + dlm->resources = (struct list_head *) __get_free_page(GFP_KERNEL); + if (!dlm->resources) { + mlog_errno(-ENOMEM); + kfree(dlm->name); + kfree(dlm); + dlm = NULL; + goto leave; + } + memset(dlm->resources, 0, PAGE_SIZE); + + for (i=0; i<DLM_HASH_SIZE; i++) + INIT_LIST_HEAD(&dlm->resources[i]); + + strcpy(dlm->name, domain); + dlm->key = key; + dlm->node_num = o2nm_this_node(); + + spin_lock_init(&dlm->spinlock); + spin_lock_init(&dlm->master_lock); + spin_lock_init(&dlm->ast_lock); + INIT_LIST_HEAD(&dlm->list); + INIT_LIST_HEAD(&dlm->dirty_list); + INIT_LIST_HEAD(&dlm->reco.resources); + INIT_LIST_HEAD(&dlm->reco.received); + INIT_LIST_HEAD(&dlm->reco.node_data); + INIT_LIST_HEAD(&dlm->purge_list); + INIT_LIST_HEAD(&dlm->dlm_domain_handlers); + dlm->reco.state = 0; + + INIT_LIST_HEAD(&dlm->pending_asts); + INIT_LIST_HEAD(&dlm->pending_basts); + + mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", + dlm->recovery_map, &(dlm->recovery_map[0])); + + memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); + memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); + memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); + + dlm->dlm_thread_task = NULL; + dlm->dlm_reco_thread_task = NULL; + init_waitqueue_head(&dlm->dlm_thread_wq); + init_waitqueue_head(&dlm->dlm_reco_thread_wq); + init_waitqueue_head(&dlm->reco.event); + init_waitqueue_head(&dlm->ast_wq); + init_waitqueue_head(&dlm->migration_wq); + INIT_LIST_HEAD(&dlm->master_list); + INIT_LIST_HEAD(&dlm->mle_hb_events); + + dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; + init_waitqueue_head(&dlm->dlm_join_events); + + dlm->reco.new_master = O2NM_INVALID_NODE_NUM; + dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; + atomic_set(&dlm->local_resources, 0); + atomic_set(&dlm->remote_resources, 0); + atomic_set(&dlm->unknown_resources, 0); + + spin_lock_init(&dlm->work_lock); + INIT_LIST_HEAD(&dlm->work_list); + INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work, dlm); + + kref_init(&dlm->dlm_refs); + dlm->dlm_state = DLM_CTXT_NEW; + + INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); + + mlog(0, "context init: refcount %u\n", + atomic_read(&dlm->dlm_refs.refcount)); + +leave: + return dlm; +} + +/* + * dlm_register_domain: one-time setup per "domain" + */ +struct dlm_ctxt * dlm_register_domain(const char *domain, + u32 key) +{ + int ret; + struct dlm_ctxt *dlm = NULL; + struct dlm_ctxt *new_ctxt = NULL; + + if (strlen(domain) > O2NM_MAX_NAME_LEN) { + ret = -ENAMETOOLONG; + mlog(ML_ERROR, "domain name length too long\n"); + goto leave; + } + + if (!o2hb_check_local_node_heartbeating()) { + mlog(ML_ERROR, "the local node has not been configured, or is " + "not heartbeating\n"); + ret = -EPROTO; + goto leave; + } + + mlog(0, "register called for domain \"%s\"\n", domain); + +retry: + dlm = NULL; + if (signal_pending(current)) { + ret = -ERESTARTSYS; + mlog_errno(ret); + goto leave; + } + + spin_lock(&dlm_domain_lock); + + dlm = __dlm_lookup_domain(domain); + if (dlm) { + if (dlm->dlm_state != DLM_CTXT_JOINED) { + spin_unlock(&dlm_domain_lock); + + mlog(0, "This ctxt is not joined yet!\n"); + wait_event_interruptible(dlm_domain_events, + dlm_wait_on_domain_helper( + domain)); + goto retry; + } + + __dlm_get(dlm); + dlm->num_joins++; + + spin_unlock(&dlm_domain_lock); + + ret = 0; + goto leave; + } + + /* doesn't exist */ + if (!new_ctxt) { + spin_unlock(&dlm_domain_lock); + + new_ctxt = dlm_alloc_ctxt(domain, key); + if (new_ctxt) + goto retry; + + ret = -ENOMEM; + mlog_errno(ret); + goto leave; + } + + /* a little variable switch-a-roo here... */ + dlm = new_ctxt; + new_ctxt = NULL; + + /* add the new domain */ + list_add_tail(&dlm->list, &dlm_domains); + spin_unlock(&dlm_domain_lock); + + ret = dlm_join_domain(dlm); + if (ret) { + mlog_errno(ret); + dlm_put(dlm); + goto leave; + } + + ret = 0; +leave: + if (new_ctxt) + dlm_free_ctxt_mem(new_ctxt); + + if (ret < 0) + dlm = ERR_PTR(ret); + + return dlm; +} +EXPORT_SYMBOL_GPL(dlm_register_domain); + +static LIST_HEAD(dlm_join_handlers); + +static void dlm_unregister_net_handlers(void) +{ + o2net_unregister_handler_list(&dlm_join_handlers); +} + +static int dlm_register_net_handlers(void) +{ + int status = 0; + + status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, + sizeof(struct dlm_query_join_request), + dlm_query_join_handler, + NULL, &dlm_join_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, + sizeof(struct dlm_assert_joined), + dlm_assert_joined_handler, + NULL, &dlm_join_handlers); + if (status) + goto bail; + + status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, + sizeof(struct dlm_cancel_join), + dlm_cancel_join_handler, + NULL, &dlm_join_handlers); + +bail: + if (status < 0) + dlm_unregister_net_handlers(); + + return status; +} + +/* Domain eviction callback handling. + * + * The file system requires notification of node death *before* the + * dlm completes it's recovery work, otherwise it may be able to + * acquire locks on resources requiring recovery. Since the dlm can + * evict a node from it's domain *before* heartbeat fires, a similar + * mechanism is required. */ + +/* Eviction is not expected to happen often, so a per-domain lock is + * not necessary. Eviction callbacks are allowed to sleep for short + * periods of time. */ +static DECLARE_RWSEM(dlm_callback_sem); + +void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, + int node_num) +{ + struct list_head *iter; + struct dlm_eviction_cb *cb; + + down_read(&dlm_callback_sem); + list_for_each(iter, &dlm->dlm_eviction_callbacks) { + cb = list_entry(iter, struct dlm_eviction_cb, ec_item); + + cb->ec_func(node_num, cb->ec_data); + } + up_read(&dlm_callback_sem); +} + +void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, + dlm_eviction_func *f, + void *data) +{ + INIT_LIST_HEAD(&cb->ec_item); + cb->ec_func = f; + cb->ec_data = data; +} +EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); + +void dlm_register_eviction_cb(struct dlm_ctxt *dlm, + struct dlm_eviction_cb *cb) +{ + down_write(&dlm_callback_sem); + list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); + up_write(&dlm_callback_sem); +} +EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); + +void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) +{ + down_write(&dlm_callback_sem); + list_del_init(&cb->ec_item); + up_write(&dlm_callback_sem); +} +EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); + +static int __init dlm_init(void) +{ + int status; + + dlm_print_version(); + + status = dlm_init_mle_cache(); + if (status) + return -1; + + status = dlm_register_net_handlers(); + if (status) { + dlm_destroy_mle_cache(); + return -1; + } + + return 0; +} + +static void __exit dlm_exit (void) +{ + dlm_unregister_net_handlers(); + dlm_destroy_mle_cache(); +} + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); + +module_init(dlm_init); +module_exit(dlm_exit); diff --git a/fs/ocfs2/dlm/dlmdomain.h b/fs/ocfs2/dlm/dlmdomain.h new file mode 100644 index 0000000..2f7f60b --- /dev/null +++ b/fs/ocfs2/dlm/dlmdomain.h @@ -0,0 +1,36 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmdomain.h + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef DLMDOMAIN_H +#define DLMDOMAIN_H + +extern spinlock_t dlm_domain_lock; +extern struct list_head dlm_domains; + +int dlm_joined(struct dlm_ctxt *dlm); +int dlm_shutting_down(struct dlm_ctxt *dlm); +void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, + int node_num); + +#endif diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c new file mode 100644 index 0000000..dd2d24d --- /dev/null +++ b/fs/ocfs2/dlm/dlmfs.c @@ -0,0 +1,640 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmfs.c + * + * Code which implements the kernel side of a minimal userspace + * interface to our DLM. This file handles the virtual file system + * used for communication with userspace. Credit should go to ramfs, + * which was a template for the fs side of this module. + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +/* Simple VFS hooks based on: */ +/* + * Resizable simple ram filesystem for Linux. + * + * Copyright (C) 2000 Linus Torvalds. + * 2000 Transmeta Corp. + */ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/pagemap.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/smp_lock.h> +#include <linux/backing-dev.h> + +#include <asm/uaccess.h> + + +#include "cluster/nodemanager.h" +#include "cluster/heartbeat.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" + +#include "userdlm.h" + +#include "dlmfsver.h" + +#define MLOG_MASK_PREFIX ML_DLMFS +#include "cluster/masklog.h" + +static struct super_operations dlmfs_ops; +static struct file_operations dlmfs_file_operations; +static struct inode_operations dlmfs_dir_inode_operations; +static struct inode_operations dlmfs_root_inode_operations; +static struct inode_operations dlmfs_file_inode_operations; +static kmem_cache_t *dlmfs_inode_cache; + +struct workqueue_struct *user_dlm_worker; + +/* + * decodes a set of open flags into a valid lock level and a set of flags. + * returns < 0 if we have invalid flags + * flags which mean something to us: + * O_RDONLY -> PRMODE level + * O_WRONLY -> EXMODE level + * + * O_NONBLOCK -> LKM_NOQUEUE + */ +static int dlmfs_decode_open_flags(int open_flags, + int *level, + int *flags) +{ + if (open_flags & (O_WRONLY|O_RDWR)) + *level = LKM_EXMODE; + else + *level = LKM_PRMODE; + + *flags = 0; + if (open_flags & O_NONBLOCK) + *flags |= LKM_NOQUEUE; + + return 0; +} + +static int dlmfs_file_open(struct inode *inode, + struct file *file) +{ + int status, level, flags; + struct dlmfs_filp_private *fp = NULL; + struct dlmfs_inode_private *ip; + + if (S_ISDIR(inode->i_mode)) + BUG(); + + mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, + file->f_flags); + + status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); + if (status < 0) + goto bail; + + /* We don't want to honor O_APPEND at read/write time as it + * doesn't make sense for LVB writes. */ + file->f_flags &= ~O_APPEND; + + fp = kmalloc(sizeof(*fp), GFP_KERNEL); + if (!fp) { + status = -ENOMEM; + goto bail; + } + fp->fp_lock_level = level; + + ip = DLMFS_I(inode); + + status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); + if (status < 0) { + /* this is a strange error to return here but I want + * to be able userspace to be able to distinguish a + * valid lock request from one that simply couldn't be + * granted. */ + if (flags & LKM_NOQUEUE && status == -EAGAIN) + status = -ETXTBSY; + kfree(fp); + goto bail; + } + + file->private_data = fp; +bail: + return status; +} + +static int dlmfs_file_release(struct inode *inode, + struct file *file) +{ + int level, status; + struct dlmfs_inode_private *ip = DLMFS_I(inode); + struct dlmfs_filp_private *fp = + (struct dlmfs_filp_private *) file->private_data; + + if (S_ISDIR(inode->i_mode)) + BUG(); + + mlog(0, "close called on inode %lu\n", inode->i_ino); + + status = 0; + if (fp) { + level = fp->fp_lock_level; + if (level != LKM_IVMODE) + user_dlm_cluster_unlock(&ip->ip_lockres, level); + + kfree(fp); + file->private_data = NULL; + } + + return 0; +} + +static ssize_t dlmfs_file_read(struct file *filp, + char __user *buf, + size_t count, + loff_t *ppos) +{ + int bytes_left; + ssize_t readlen; + char *lvb_buf; + struct inode *inode = filp->f_dentry->d_inode; + + mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", + inode->i_ino, count, *ppos); + + if (*ppos >= i_size_read(inode)) + return 0; + + if (!count) + return 0; + + if (!access_ok(VERIFY_WRITE, buf, count)) + return -EFAULT; + + /* don't read past the lvb */ + if ((count + *ppos) > i_size_read(inode)) + readlen = i_size_read(inode) - *ppos; + else + readlen = count - *ppos; + + lvb_buf = kmalloc(readlen, GFP_KERNEL); + if (!lvb_buf) + return -ENOMEM; + + user_dlm_read_lvb(inode, lvb_buf, readlen); + bytes_left = __copy_to_user(buf, lvb_buf, readlen); + readlen -= bytes_left; + + kfree(lvb_buf); + + *ppos = *ppos + readlen; + + mlog(0, "read %zd bytes\n", readlen); + return readlen; +} + +static ssize_t dlmfs_file_write(struct file *filp, + const char __user *buf, + size_t count, + loff_t *ppos) +{ + int bytes_left; + ssize_t writelen; + char *lvb_buf; + struct inode *inode = filp->f_dentry->d_inode; + + mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", + inode->i_ino, count, *ppos); + + if (*ppos >= i_size_read(inode)) + return -ENOSPC; + + if (!count) + return 0; + + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; + + /* don't write past the lvb */ + if ((count + *ppos) > i_size_read(inode)) + writelen = i_size_read(inode) - *ppos; + else + writelen = count - *ppos; + + lvb_buf = kmalloc(writelen, GFP_KERNEL); + if (!lvb_buf) + return -ENOMEM; + + bytes_left = copy_from_user(lvb_buf, buf, writelen); + writelen -= bytes_left; + if (writelen) + user_dlm_write_lvb(inode, lvb_buf, writelen); + + kfree(lvb_buf); + + *ppos = *ppos + writelen; + mlog(0, "wrote %zd bytes\n", writelen); + return writelen; +} + +static void dlmfs_init_once(void *foo, + kmem_cache_t *cachep, + unsigned long flags) +{ + struct dlmfs_inode_private *ip = + (struct dlmfs_inode_private *) foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) { + ip->ip_dlm = NULL; + ip->ip_parent = NULL; + + inode_init_once(&ip->ip_vfs_inode); + } +} + +static struct inode *dlmfs_alloc_inode(struct super_block *sb) +{ + struct dlmfs_inode_private *ip; + + ip = kmem_cache_alloc(dlmfs_inode_cache, SLAB_NOFS); + if (!ip) + return NULL; + + return &ip->ip_vfs_inode; +} + +static void dlmfs_destroy_inode(struct inode *inode) +{ + kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); +} + +static void dlmfs_clear_inode(struct inode *inode) +{ + int status; + struct dlmfs_inode_private *ip; + + if (!inode) + return; + + mlog(0, "inode %lu\n", inode->i_ino); + + ip = DLMFS_I(inode); + + if (S_ISREG(inode->i_mode)) { + status = user_dlm_destroy_lock(&ip->ip_lockres); + if (status < 0) + mlog_errno(status); + iput(ip->ip_parent); + goto clear_fields; + } + + mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); + /* we must be a directory. If required, lets unregister the + * dlm context now. */ + if (ip->ip_dlm) + user_dlm_unregister_context(ip->ip_dlm); +clear_fields: + ip->ip_parent = NULL; + ip->ip_dlm = NULL; +} + +static struct backing_dev_info dlmfs_backing_dev_info = { + .ra_pages = 0, /* No readahead */ + .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, +}; + +static struct inode *dlmfs_get_root_inode(struct super_block *sb) +{ + struct inode *inode = new_inode(sb); + int mode = S_IFDIR | 0755; + struct dlmfs_inode_private *ip; + + if (inode) { + ip = DLMFS_I(inode); + + inode->i_mode = mode; + inode->i_uid = current->fsuid; + inode->i_gid = current->fsgid; + inode->i_blksize = PAGE_CACHE_SIZE; + inode->i_blocks = 0; + inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_nlink++; + + inode->i_fop = &simple_dir_operations; + inode->i_op = &dlmfs_root_inode_operations; + } + + return inode; +} + +static struct inode *dlmfs_get_inode(struct inode *parent, + struct dentry *dentry, + int mode) +{ + struct super_block *sb = parent->i_sb; + struct inode * inode = new_inode(sb); + struct dlmfs_inode_private *ip; + + if (!inode) + return NULL; + + inode->i_mode = mode; + inode->i_uid = current->fsuid; + inode->i_gid = current->fsgid; + inode->i_blksize = PAGE_CACHE_SIZE; + inode->i_blocks = 0; + inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + + ip = DLMFS_I(inode); + ip->ip_dlm = DLMFS_I(parent)->ip_dlm; + + switch (mode & S_IFMT) { + default: + /* for now we don't support anything other than + * directories and regular files. */ + BUG(); + break; + case S_IFREG: + inode->i_op = &dlmfs_file_inode_operations; + inode->i_fop = &dlmfs_file_operations; + + i_size_write(inode, DLM_LVB_LEN); + + user_dlm_lock_res_init(&ip->ip_lockres, dentry); + + /* released at clear_inode time, this insures that we + * get to drop the dlm reference on each lock *before* + * we call the unregister code for releasing parent + * directories. */ + ip->ip_parent = igrab(parent); + BUG_ON(!ip->ip_parent); + break; + case S_IFDIR: + inode->i_op = &dlmfs_dir_inode_operations; + inode->i_fop = &simple_dir_operations; + + /* directory inodes start off with i_nlink == + * 2 (for "." entry) */ + inode->i_nlink++; + break; + } + + if (parent->i_mode & S_ISGID) { + inode->i_gid = parent->i_gid; + if (S_ISDIR(mode)) + inode->i_mode |= S_ISGID; + } + + return inode; +} + +/* + * File creation. Allocate an inode, and we're done.. + */ +/* SMP-safe */ +static int dlmfs_mkdir(struct inode * dir, + struct dentry * dentry, + int mode) +{ + int status; + struct inode *inode = NULL; + struct qstr *domain = &dentry->d_name; + struct dlmfs_inode_private *ip; + struct dlm_ctxt *dlm; + + mlog(0, "mkdir %.*s\n", domain->len, domain->name); + + /* verify that we have a proper domain */ + if (domain->len >= O2NM_MAX_NAME_LEN) { + status = -EINVAL; + mlog(ML_ERROR, "invalid domain name for directory.\n"); + goto bail; + } + + inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); + if (!inode) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + ip = DLMFS_I(inode); + + dlm = user_dlm_register_context(domain); + if (IS_ERR(dlm)) { + status = PTR_ERR(dlm); + mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", + status, domain->len, domain->name); + goto bail; + } + ip->ip_dlm = dlm; + + dir->i_nlink++; + d_instantiate(dentry, inode); + dget(dentry); /* Extra count - pin the dentry in core */ + + status = 0; +bail: + if (status < 0) + iput(inode); + return status; +} + +static int dlmfs_create(struct inode *dir, + struct dentry *dentry, + int mode, + struct nameidata *nd) +{ + int status = 0; + struct inode *inode; + struct qstr *name = &dentry->d_name; + + mlog(0, "create %.*s\n", name->len, name->name); + + /* verify name is valid and doesn't contain any dlm reserved + * characters */ + if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || + name->name[0] == '$') { + status = -EINVAL; + mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, + name->name); + goto bail; + } + + inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); + if (!inode) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + d_instantiate(dentry, inode); + dget(dentry); /* Extra count - pin the dentry in core */ +bail: + return status; +} + +static int dlmfs_unlink(struct inode *dir, + struct dentry *dentry) +{ + int status; + struct inode *inode = dentry->d_inode; + + mlog(0, "unlink inode %lu\n", inode->i_ino); + + /* if there are no current holders, or none that are waiting + * to acquire a lock, this basically destroys our lockres. */ + status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); + if (status < 0) { + mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", + dentry->d_name.len, dentry->d_name.name, status); + goto bail; + } + status = simple_unlink(dir, dentry); +bail: + return status; +} + +static int dlmfs_fill_super(struct super_block * sb, + void * data, + int silent) +{ + struct inode * inode; + struct dentry * root; + + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + sb->s_magic = DLMFS_MAGIC; + sb->s_op = &dlmfs_ops; + inode = dlmfs_get_root_inode(sb); + if (!inode) + return -ENOMEM; + + root = d_alloc_root(inode); + if (!root) { + iput(inode); + return -ENOMEM; + } + sb->s_root = root; + return 0; +} + +static struct file_operations dlmfs_file_operations = { + .open = dlmfs_file_open, + .release = dlmfs_file_release, + .read = dlmfs_file_read, + .write = dlmfs_file_write, +}; + +static struct inode_operations dlmfs_dir_inode_operations = { + .create = dlmfs_create, + .lookup = simple_lookup, + .unlink = dlmfs_unlink, +}; + +/* this way we can restrict mkdir to only the toplevel of the fs. */ +static struct inode_operations dlmfs_root_inode_operations = { + .lookup = simple_lookup, + .mkdir = dlmfs_mkdir, + .rmdir = simple_rmdir, +}; + +static struct super_operations dlmfs_ops = { + .statfs = simple_statfs, + .alloc_inode = dlmfs_alloc_inode, + .destroy_inode = dlmfs_destroy_inode, + .clear_inode = dlmfs_clear_inode, + .drop_inode = generic_delete_inode, +}; + +static struct inode_operations dlmfs_file_inode_operations = { + .getattr = simple_getattr, +}; + +static struct super_block *dlmfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super); +} + +static struct file_system_type dlmfs_fs_type = { + .owner = THIS_MODULE, + .name = "ocfs2_dlmfs", + .get_sb = dlmfs_get_sb, + .kill_sb = kill_litter_super, +}; + +static int __init init_dlmfs_fs(void) +{ + int status; + int cleanup_inode = 0, cleanup_worker = 0; + + dlmfs_print_version(); + + dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", + sizeof(struct dlmfs_inode_private), + 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, + dlmfs_init_once, NULL); + if (!dlmfs_inode_cache) + return -ENOMEM; + cleanup_inode = 1; + + user_dlm_worker = create_singlethread_workqueue("user_dlm"); + if (!user_dlm_worker) { + status = -ENOMEM; + goto bail; + } + cleanup_worker = 1; + + status = register_filesystem(&dlmfs_fs_type); +bail: + if (status) { + if (cleanup_inode) + kmem_cache_destroy(dlmfs_inode_cache); + if (cleanup_worker) + destroy_workqueue(user_dlm_worker); + } else + printk("OCFS2 User DLM kernel interface loaded\n"); + return status; +} + +static void __exit exit_dlmfs_fs(void) +{ + unregister_filesystem(&dlmfs_fs_type); + + flush_workqueue(user_dlm_worker); + destroy_workqueue(user_dlm_worker); + + if (kmem_cache_destroy(dlmfs_inode_cache)) + printk(KERN_INFO "dlmfs_inode_cache: not all structures " + "were freed\n"); +} + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); + +module_init(init_dlmfs_fs) +module_exit(exit_dlmfs_fs) diff --git a/fs/ocfs2/dlm/dlmfsver.c b/fs/ocfs2/dlm/dlmfsver.c new file mode 100644 index 0000000..d2be3ad --- /dev/null +++ b/fs/ocfs2/dlm/dlmfsver.c @@ -0,0 +1,42 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmfsver.c + * + * version string + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> + +#include "dlmfsver.h" + +#define DLM_BUILD_VERSION "1.3.3" + +#define VERSION_STR "OCFS2 DLMFS " DLM_BUILD_VERSION + +void dlmfs_print_version(void) +{ + printk(KERN_INFO "%s\n", VERSION_STR); +} + +MODULE_DESCRIPTION(VERSION_STR); + +MODULE_VERSION(DLM_BUILD_VERSION); diff --git a/fs/ocfs2/dlm/dlmfsver.h b/fs/ocfs2/dlm/dlmfsver.h new file mode 100644 index 0000000..f35eadb --- /dev/null +++ b/fs/ocfs2/dlm/dlmfsver.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmver.h + * + * Function prototypes + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef DLMFS_VER_H +#define DLMFS_VER_H + +void dlmfs_print_version(void); + +#endif /* DLMFS_VER_H */ diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c new file mode 100644 index 0000000..d1a0038 --- /dev/null +++ b/fs/ocfs2/dlm/dlmlock.c @@ -0,0 +1,676 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmlock.c + * + * underlying calls for lock creation + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/spinlock.h> +#include <linux/delay.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" + +#include "dlmconvert.h" + +#define MLOG_MASK_PREFIX ML_DLM +#include "cluster/masklog.h" + +static spinlock_t dlm_cookie_lock = SPIN_LOCK_UNLOCKED; +static u64 dlm_next_cookie = 1; + +static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags); +static void dlm_init_lock(struct dlm_lock *newlock, int type, + u8 node, u64 cookie); +static void dlm_lock_release(struct kref *kref); +static void dlm_lock_detach_lockres(struct dlm_lock *lock); + +/* Tell us whether we can grant a new lock request. + * locking: + * caller needs: res->spinlock + * taken: none + * held on exit: none + * returns: 1 if the lock can be granted, 0 otherwise. + */ +static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + struct list_head *iter; + struct dlm_lock *tmplock; + + list_for_each(iter, &res->granted) { + tmplock = list_entry(iter, struct dlm_lock, list); + + if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) + return 0; + } + + list_for_each(iter, &res->converting) { + tmplock = list_entry(iter, struct dlm_lock, list); + + if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) + return 0; + } + + return 1; +} + +/* performs lock creation at the lockres master site + * locking: + * caller needs: none + * taken: takes and drops res->spinlock + * held on exit: none + * returns: DLM_NORMAL, DLM_NOTQUEUED + */ +static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags) +{ + int call_ast = 0, kick_thread = 0; + enum dlm_status status = DLM_NORMAL; + + mlog_entry("type=%d\n", lock->ml.type); + + spin_lock(&res->spinlock); + /* if called from dlm_create_lock_handler, need to + * ensure it will not sleep in dlm_wait_on_lockres */ + status = __dlm_lockres_state_to_status(res); + if (status != DLM_NORMAL && + lock->ml.node != dlm->node_num) { + /* erf. state changed after lock was dropped. */ + spin_unlock(&res->spinlock); + dlm_error(status); + return status; + } + __dlm_wait_on_lockres(res); + __dlm_lockres_reserve_ast(res); + + if (dlm_can_grant_new_lock(res, lock)) { + mlog(0, "I can grant this lock right away\n"); + /* got it right away */ + lock->lksb->status = DLM_NORMAL; + status = DLM_NORMAL; + dlm_lock_get(lock); + list_add_tail(&lock->list, &res->granted); + + /* for the recovery lock, we can't allow the ast + * to be queued since the dlmthread is already + * frozen. but the recovery lock is always locked + * with LKM_NOQUEUE so we do not need the ast in + * this special case */ + if (!dlm_is_recovery_lock(res->lockname.name, + res->lockname.len)) { + kick_thread = 1; + call_ast = 1; + } + } else { + /* for NOQUEUE request, unless we get the + * lock right away, return DLM_NOTQUEUED */ + if (flags & LKM_NOQUEUE) + status = DLM_NOTQUEUED; + else { + dlm_lock_get(lock); + list_add_tail(&lock->list, &res->blocked); + kick_thread = 1; + } + } + + spin_unlock(&res->spinlock); + wake_up(&res->wq); + + /* either queue the ast or release it */ + if (call_ast) + dlm_queue_ast(dlm, lock); + else + dlm_lockres_release_ast(dlm, res); + + dlm_lockres_calc_usage(dlm, res); + if (kick_thread) + dlm_kick_thread(dlm, res); + + return status; +} + +void dlm_revert_pending_lock(struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + /* remove from local queue if it failed */ + list_del_init(&lock->list); + lock->lksb->flags &= ~DLM_LKSB_GET_LVB; +} + + +/* + * locking: + * caller needs: none + * taken: takes and drops res->spinlock + * held on exit: none + * returns: DLM_DENIED, DLM_RECOVERING, or net status + */ +static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags) +{ + enum dlm_status status = DLM_DENIED; + + mlog_entry("type=%d\n", lock->ml.type); + mlog(0, "lockres %.*s, flags = 0x%x\n", res->lockname.len, + res->lockname.name, flags); + + spin_lock(&res->spinlock); + + /* will exit this call with spinlock held */ + __dlm_wait_on_lockres(res); + res->state |= DLM_LOCK_RES_IN_PROGRESS; + + /* add lock to local (secondary) queue */ + dlm_lock_get(lock); + list_add_tail(&lock->list, &res->blocked); + lock->lock_pending = 1; + spin_unlock(&res->spinlock); + + /* spec seems to say that you will get DLM_NORMAL when the lock + * has been queued, meaning we need to wait for a reply here. */ + status = dlm_send_remote_lock_request(dlm, res, lock, flags); + + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + lock->lock_pending = 0; + if (status != DLM_NORMAL) { + if (status != DLM_NOTQUEUED) + dlm_error(status); + dlm_revert_pending_lock(res, lock); + dlm_lock_put(lock); + } + spin_unlock(&res->spinlock); + + dlm_lockres_calc_usage(dlm, res); + + wake_up(&res->wq); + return status; +} + + +/* for remote lock creation. + * locking: + * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS + * taken: none + * held on exit: none + * returns: DLM_NOLOCKMGR, or net status + */ +static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, int flags) +{ + struct dlm_create_lock create; + int tmpret, status = 0; + enum dlm_status ret; + + mlog_entry_void(); + + memset(&create, 0, sizeof(create)); + create.node_idx = dlm->node_num; + create.requested_type = lock->ml.type; + create.cookie = lock->ml.cookie; + create.namelen = res->lockname.len; + create.flags = cpu_to_be32(flags); + memcpy(create.name, res->lockname.name, create.namelen); + + tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create, + sizeof(create), res->owner, &status); + if (tmpret >= 0) { + // successfully sent and received + ret = status; // this is already a dlm_status + } else { + mlog_errno(tmpret); + if (dlm_is_host_down(tmpret)) { + ret = DLM_RECOVERING; + mlog(0, "node %u died so returning DLM_RECOVERING " + "from lock message!\n", res->owner); + } else { + ret = dlm_err_to_dlm_status(tmpret); + } + } + + return ret; +} + +void dlm_lock_get(struct dlm_lock *lock) +{ + kref_get(&lock->lock_refs); +} + +void dlm_lock_put(struct dlm_lock *lock) +{ + kref_put(&lock->lock_refs, dlm_lock_release); +} + +static void dlm_lock_release(struct kref *kref) +{ + struct dlm_lock *lock; + + lock = container_of(kref, struct dlm_lock, lock_refs); + + BUG_ON(!list_empty(&lock->list)); + BUG_ON(!list_empty(&lock->ast_list)); + BUG_ON(!list_empty(&lock->bast_list)); + BUG_ON(lock->ast_pending); + BUG_ON(lock->bast_pending); + + dlm_lock_detach_lockres(lock); + + if (lock->lksb_kernel_allocated) { + mlog(0, "freeing kernel-allocated lksb\n"); + kfree(lock->lksb); + } + kfree(lock); +} + +/* associate a lock with it's lockres, getting a ref on the lockres */ +void dlm_lock_attach_lockres(struct dlm_lock *lock, + struct dlm_lock_resource *res) +{ + dlm_lockres_get(res); + lock->lockres = res; +} + +/* drop ref on lockres, if there is still one associated with lock */ +static void dlm_lock_detach_lockres(struct dlm_lock *lock) +{ + struct dlm_lock_resource *res; + + res = lock->lockres; + if (res) { + lock->lockres = NULL; + mlog(0, "removing lock's lockres reference\n"); + dlm_lockres_put(res); + } +} + +static void dlm_init_lock(struct dlm_lock *newlock, int type, + u8 node, u64 cookie) +{ + INIT_LIST_HEAD(&newlock->list); + INIT_LIST_HEAD(&newlock->ast_list); + INIT_LIST_HEAD(&newlock->bast_list); + spin_lock_init(&newlock->spinlock); + newlock->ml.type = type; + newlock->ml.convert_type = LKM_IVMODE; + newlock->ml.highest_blocked = LKM_IVMODE; + newlock->ml.node = node; + newlock->ml.pad1 = 0; + newlock->ml.list = 0; + newlock->ml.flags = 0; + newlock->ast = NULL; + newlock->bast = NULL; + newlock->astdata = NULL; + newlock->ml.cookie = cpu_to_be64(cookie); + newlock->ast_pending = 0; + newlock->bast_pending = 0; + newlock->convert_pending = 0; + newlock->lock_pending = 0; + newlock->unlock_pending = 0; + newlock->cancel_pending = 0; + newlock->lksb_kernel_allocated = 0; + + kref_init(&newlock->lock_refs); +} + +struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, + struct dlm_lockstatus *lksb) +{ + struct dlm_lock *lock; + int kernel_allocated = 0; + + lock = kcalloc(1, sizeof(*lock), GFP_KERNEL); + if (!lock) + return NULL; + + if (!lksb) { + /* zero memory only if kernel-allocated */ + lksb = kcalloc(1, sizeof(*lksb), GFP_KERNEL); + if (!lksb) { + kfree(lock); + return NULL; + } + kernel_allocated = 1; + } + + dlm_init_lock(lock, type, node, cookie); + if (kernel_allocated) + lock->lksb_kernel_allocated = 1; + lock->lksb = lksb; + lksb->lockid = lock; + return lock; +} + +/* handler for lock creation net message + * locking: + * caller needs: none + * taken: takes and drops res->spinlock + * held on exit: none + * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED + */ +int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; + struct dlm_lock_resource *res = NULL; + struct dlm_lock *newlock = NULL; + struct dlm_lockstatus *lksb = NULL; + enum dlm_status status = DLM_NORMAL; + char *name; + unsigned int namelen; + + BUG_ON(!dlm); + + mlog_entry_void(); + + if (!dlm_grab(dlm)) + return DLM_REJECTED; + + mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), + "Domain %s not fully joined!\n", dlm->name); + + name = create->name; + namelen = create->namelen; + + status = DLM_IVBUFLEN; + if (namelen > DLM_LOCKID_NAME_MAX) { + dlm_error(status); + goto leave; + } + + status = DLM_SYSERR; + newlock = dlm_new_lock(create->requested_type, + create->node_idx, + be64_to_cpu(create->cookie), NULL); + if (!newlock) { + dlm_error(status); + goto leave; + } + + lksb = newlock->lksb; + + if (be32_to_cpu(create->flags) & LKM_GET_LVB) { + lksb->flags |= DLM_LKSB_GET_LVB; + mlog(0, "set DLM_LKSB_GET_LVB flag\n"); + } + + status = DLM_IVLOCKID; + res = dlm_lookup_lockres(dlm, name, namelen); + if (!res) { + dlm_error(status); + goto leave; + } + + spin_lock(&res->spinlock); + status = __dlm_lockres_state_to_status(res); + spin_unlock(&res->spinlock); + + if (status != DLM_NORMAL) { + mlog(0, "lockres recovering/migrating/in-progress\n"); + goto leave; + } + + dlm_lock_attach_lockres(newlock, res); + + status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); +leave: + if (status != DLM_NORMAL) + if (newlock) + dlm_lock_put(newlock); + + if (res) + dlm_lockres_put(res); + + dlm_put(dlm); + + return status; +} + + +/* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ +static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) +{ + u64 tmpnode = node_num; + + /* shift single byte of node num into top 8 bits */ + tmpnode <<= 56; + + spin_lock(&dlm_cookie_lock); + *cookie = (dlm_next_cookie | tmpnode); + if (++dlm_next_cookie & 0xff00000000000000ull) { + mlog(0, "This node's cookie will now wrap!\n"); + dlm_next_cookie = 1; + } + spin_unlock(&dlm_cookie_lock); +} + +enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, + struct dlm_lockstatus *lksb, int flags, + const char *name, dlm_astlockfunc_t *ast, void *data, + dlm_bastlockfunc_t *bast) +{ + enum dlm_status status; + struct dlm_lock_resource *res = NULL; + struct dlm_lock *lock = NULL; + int convert = 0, recovery = 0; + + /* yes this function is a mess. + * TODO: clean this up. lots of common code in the + * lock and convert paths, especially in the retry blocks */ + if (!lksb) { + dlm_error(DLM_BADARGS); + return DLM_BADARGS; + } + + status = DLM_BADPARAM; + if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { + dlm_error(status); + goto error; + } + + if (flags & ~LKM_VALID_FLAGS) { + dlm_error(status); + goto error; + } + + convert = (flags & LKM_CONVERT); + recovery = (flags & LKM_RECOVERY); + + if (recovery && + (!dlm_is_recovery_lock(name, strlen(name)) || convert) ) { + dlm_error(status); + goto error; + } + if (convert && (flags & LKM_LOCAL)) { + mlog(ML_ERROR, "strange LOCAL convert request!\n"); + goto error; + } + + if (convert) { + /* CONVERT request */ + + /* if converting, must pass in a valid dlm_lock */ + lock = lksb->lockid; + if (!lock) { + mlog(ML_ERROR, "NULL lock pointer in convert " + "request\n"); + goto error; + } + + res = lock->lockres; + if (!res) { + mlog(ML_ERROR, "NULL lockres pointer in convert " + "request\n"); + goto error; + } + dlm_lockres_get(res); + + /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are + * static after the original lock call. convert requests will + * ensure that everything is the same, or return DLM_BADARGS. + * this means that DLM_DENIED_NOASTS will never be returned. + */ + if (lock->lksb != lksb || lock->ast != ast || + lock->bast != bast || lock->astdata != data) { + status = DLM_BADARGS; + mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " + "astdata=%p\n", lksb, ast, bast, data); + mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " + "astdata=%p\n", lock->lksb, lock->ast, + lock->bast, lock->astdata); + goto error; + } +retry_convert: + dlm_wait_for_recovery(dlm); + + if (res->owner == dlm->node_num) + status = dlmconvert_master(dlm, res, lock, flags, mode); + else + status = dlmconvert_remote(dlm, res, lock, flags, mode); + if (status == DLM_RECOVERING || status == DLM_MIGRATING || + status == DLM_FORWARD) { + /* for now, see how this works without sleeping + * and just retry right away. I suspect the reco + * or migration will complete fast enough that + * no waiting will be necessary */ + mlog(0, "retrying convert with migration/recovery/" + "in-progress\n"); + msleep(100); + goto retry_convert; + } + } else { + u64 tmpcookie; + + /* LOCK request */ + status = DLM_BADARGS; + if (!name) { + dlm_error(status); + goto error; + } + + status = DLM_IVBUFLEN; + if (strlen(name) > DLM_LOCKID_NAME_MAX || strlen(name) < 1) { + dlm_error(status); + goto error; + } + + dlm_get_next_cookie(dlm->node_num, &tmpcookie); + lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb); + if (!lock) { + dlm_error(status); + goto error; + } + + if (!recovery) + dlm_wait_for_recovery(dlm); + + /* find or create the lock resource */ + res = dlm_get_lock_resource(dlm, name, flags); + if (!res) { + status = DLM_IVLOCKID; + dlm_error(status); + goto error; + } + + mlog(0, "type=%d, flags = 0x%x\n", mode, flags); + mlog(0, "creating lock: lock=%p res=%p\n", lock, res); + + dlm_lock_attach_lockres(lock, res); + lock->ast = ast; + lock->bast = bast; + lock->astdata = data; + +retry_lock: + if (flags & LKM_VALBLK) { + mlog(0, "LKM_VALBLK passed by caller\n"); + + /* LVB requests for non PR, PW or EX locks are + * ignored. */ + if (mode < LKM_PRMODE) + flags &= ~LKM_VALBLK; + else { + flags |= LKM_GET_LVB; + lock->lksb->flags |= DLM_LKSB_GET_LVB; + } + } + + if (res->owner == dlm->node_num) + status = dlmlock_master(dlm, res, lock, flags); + else + status = dlmlock_remote(dlm, res, lock, flags); + + if (status == DLM_RECOVERING || status == DLM_MIGRATING || + status == DLM_FORWARD) { + mlog(0, "retrying lock with migration/" + "recovery/in progress\n"); + msleep(100); + dlm_wait_for_recovery(dlm); + goto retry_lock; + } + + if (status != DLM_NORMAL) { + lock->lksb->flags &= ~DLM_LKSB_GET_LVB; + if (status != DLM_NOTQUEUED) + dlm_error(status); + goto error; + } + } + +error: + if (status != DLM_NORMAL) { + if (lock && !convert) + dlm_lock_put(lock); + // this is kind of unnecessary + lksb->status = status; + } + + /* put lockres ref from the convert path + * or from dlm_get_lock_resource */ + if (res) + dlm_lockres_put(res); + + return status; +} +EXPORT_SYMBOL_GPL(dlmlock); diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c new file mode 100644 index 0000000..27e984f --- /dev/null +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -0,0 +1,2664 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmmod.c + * + * standalone DLM module + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/spinlock.h> +#include <linux/delay.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" +#include "dlmdebug.h" +#include "dlmdomain.h" + +#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_MASTER) +#include "cluster/masklog.h" + +enum dlm_mle_type { + DLM_MLE_BLOCK, + DLM_MLE_MASTER, + DLM_MLE_MIGRATION +}; + +struct dlm_lock_name +{ + u8 len; + u8 name[DLM_LOCKID_NAME_MAX]; +}; + +struct dlm_master_list_entry +{ + struct list_head list; + struct list_head hb_events; + struct dlm_ctxt *dlm; + spinlock_t spinlock; + wait_queue_head_t wq; + atomic_t woken; + struct kref mle_refs; + unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; + u8 master; + u8 new_master; + enum dlm_mle_type type; + struct o2hb_callback_func mle_hb_up; + struct o2hb_callback_func mle_hb_down; + union { + struct dlm_lock_resource *res; + struct dlm_lock_name name; + } u; +}; + +static void dlm_mle_node_down(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle, + struct o2nm_node *node, + int idx); +static void dlm_mle_node_up(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle, + struct o2nm_node *node, + int idx); + +static void dlm_assert_master_worker(struct dlm_work_item *item, void *data); +static int dlm_do_assert_master(struct dlm_ctxt *dlm, const char *lockname, + unsigned int namelen, void *nodemap, + u32 flags); + +static inline int dlm_mle_equal(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle, + const char *name, + unsigned int namelen) +{ + struct dlm_lock_resource *res; + + if (dlm != mle->dlm) + return 0; + + if (mle->type == DLM_MLE_BLOCK || + mle->type == DLM_MLE_MIGRATION) { + if (namelen != mle->u.name.len || + memcmp(name, mle->u.name.name, namelen)!=0) + return 0; + } else { + res = mle->u.res; + if (namelen != res->lockname.len || + memcmp(res->lockname.name, name, namelen) != 0) + return 0; + } + return 1; +} + +#if 0 +/* Code here is included but defined out as it aids debugging */ + +void dlm_print_one_mle(struct dlm_master_list_entry *mle) +{ + int i = 0, refs; + char *type; + char attached; + u8 master; + unsigned int namelen; + const char *name; + struct kref *k; + + k = &mle->mle_refs; + if (mle->type == DLM_MLE_BLOCK) + type = "BLK"; + else if (mle->type == DLM_MLE_MASTER) + type = "MAS"; + else + type = "MIG"; + refs = atomic_read(&k->refcount); + master = mle->master; + attached = (list_empty(&mle->hb_events) ? 'N' : 'Y'); + + if (mle->type != DLM_MLE_MASTER) { + namelen = mle->u.name.len; + name = mle->u.name.name; + } else { + namelen = mle->u.res->lockname.len; + name = mle->u.res->lockname.name; + } + + mlog(ML_NOTICE, " #%3d: %3s %3d %3u %3u %c (%d)%.*s\n", + i, type, refs, master, mle->new_master, attached, + namelen, namelen, name); +} + +static void dlm_dump_mles(struct dlm_ctxt *dlm) +{ + struct dlm_master_list_entry *mle; + struct list_head *iter; + + mlog(ML_NOTICE, "dumping all mles for domain %s:\n", dlm->name); + mlog(ML_NOTICE, " ####: type refs owner new events? lockname nodemap votemap respmap maybemap\n"); + spin_lock(&dlm->master_lock); + list_for_each(iter, &dlm->master_list) { + mle = list_entry(iter, struct dlm_master_list_entry, list); + dlm_print_one_mle(mle); + } + spin_unlock(&dlm->master_lock); +} + +int dlm_dump_all_mles(const char __user *data, unsigned int len) +{ + struct list_head *iter; + struct dlm_ctxt *dlm; + + spin_lock(&dlm_domain_lock); + list_for_each(iter, &dlm_domains) { + dlm = list_entry (iter, struct dlm_ctxt, list); + mlog(ML_NOTICE, "found dlm: %p, name=%s\n", dlm, dlm->name); + dlm_dump_mles(dlm); + } + spin_unlock(&dlm_domain_lock); + return len; +} +EXPORT_SYMBOL_GPL(dlm_dump_all_mles); + +#endif /* 0 */ + + +static kmem_cache_t *dlm_mle_cache = NULL; + + +static void dlm_mle_release(struct kref *kref); +static void dlm_init_mle(struct dlm_master_list_entry *mle, + enum dlm_mle_type type, + struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + const char *name, + unsigned int namelen); +static void dlm_put_mle(struct dlm_master_list_entry *mle); +static void __dlm_put_mle(struct dlm_master_list_entry *mle); +static int dlm_find_mle(struct dlm_ctxt *dlm, + struct dlm_master_list_entry **mle, + char *name, unsigned int namelen); + +static int dlm_do_master_request(struct dlm_master_list_entry *mle, int to); + + +static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + int *blocked); +static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + int blocked); +static int dlm_add_migration_mle(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + struct dlm_master_list_entry **oldmle, + const char *name, unsigned int namelen, + u8 new_master, u8 master); + +static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res); +static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 target); + + +int dlm_is_host_down(int errno) +{ + switch (errno) { + case -EBADF: + case -ECONNREFUSED: + case -ENOTCONN: + case -ECONNRESET: + case -EPIPE: + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ETIMEDOUT: + case -ECONNABORTED: + case -ENETDOWN: + case -ENETUNREACH: + case -ENETRESET: + case -ESHUTDOWN: + case -ENOPROTOOPT: + case -EINVAL: /* if returned from our tcp code, + this means there is no socket */ + return 1; + } + return 0; +} + + +/* + * MASTER LIST FUNCTIONS + */ + + +/* + * regarding master list entries and heartbeat callbacks: + * + * in order to avoid sleeping and allocation that occurs in + * heartbeat, master list entries are simply attached to the + * dlm's established heartbeat callbacks. the mle is attached + * when it is created, and since the dlm->spinlock is held at + * that time, any heartbeat event will be properly discovered + * by the mle. the mle needs to be detached from the + * dlm->mle_hb_events list as soon as heartbeat events are no + * longer useful to the mle, and before the mle is freed. + * + * as a general rule, heartbeat events are no longer needed by + * the mle once an "answer" regarding the lock master has been + * received. + */ +static inline void __dlm_mle_attach_hb_events(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle) +{ + assert_spin_locked(&dlm->spinlock); + + list_add_tail(&mle->hb_events, &dlm->mle_hb_events); +} + + +static inline void __dlm_mle_detach_hb_events(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle) +{ + if (!list_empty(&mle->hb_events)) + list_del_init(&mle->hb_events); +} + + +static inline void dlm_mle_detach_hb_events(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle) +{ + spin_lock(&dlm->spinlock); + __dlm_mle_detach_hb_events(dlm, mle); + spin_unlock(&dlm->spinlock); +} + +/* remove from list and free */ +static void __dlm_put_mle(struct dlm_master_list_entry *mle) +{ + struct dlm_ctxt *dlm; + dlm = mle->dlm; + + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&dlm->master_lock); + BUG_ON(!atomic_read(&mle->mle_refs.refcount)); + + kref_put(&mle->mle_refs, dlm_mle_release); +} + + +/* must not have any spinlocks coming in */ +static void dlm_put_mle(struct dlm_master_list_entry *mle) +{ + struct dlm_ctxt *dlm; + dlm = mle->dlm; + + spin_lock(&dlm->spinlock); + spin_lock(&dlm->master_lock); + __dlm_put_mle(mle); + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); +} + +static inline void dlm_get_mle(struct dlm_master_list_entry *mle) +{ + kref_get(&mle->mle_refs); +} + +static void dlm_init_mle(struct dlm_master_list_entry *mle, + enum dlm_mle_type type, + struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + const char *name, + unsigned int namelen) +{ + assert_spin_locked(&dlm->spinlock); + + mle->dlm = dlm; + mle->type = type; + INIT_LIST_HEAD(&mle->list); + INIT_LIST_HEAD(&mle->hb_events); + memset(mle->maybe_map, 0, sizeof(mle->maybe_map)); + spin_lock_init(&mle->spinlock); + init_waitqueue_head(&mle->wq); + atomic_set(&mle->woken, 0); + kref_init(&mle->mle_refs); + memset(mle->response_map, 0, sizeof(mle->response_map)); + mle->master = O2NM_MAX_NODES; + mle->new_master = O2NM_MAX_NODES; + + if (mle->type == DLM_MLE_MASTER) { + BUG_ON(!res); + mle->u.res = res; + } else if (mle->type == DLM_MLE_BLOCK) { + BUG_ON(!name); + memcpy(mle->u.name.name, name, namelen); + mle->u.name.len = namelen; + } else /* DLM_MLE_MIGRATION */ { + BUG_ON(!name); + memcpy(mle->u.name.name, name, namelen); + mle->u.name.len = namelen; + } + + /* copy off the node_map and register hb callbacks on our copy */ + memcpy(mle->node_map, dlm->domain_map, sizeof(mle->node_map)); + memcpy(mle->vote_map, dlm->domain_map, sizeof(mle->vote_map)); + clear_bit(dlm->node_num, mle->vote_map); + clear_bit(dlm->node_num, mle->node_map); + + /* attach the mle to the domain node up/down events */ + __dlm_mle_attach_hb_events(dlm, mle); +} + + +/* returns 1 if found, 0 if not */ +static int dlm_find_mle(struct dlm_ctxt *dlm, + struct dlm_master_list_entry **mle, + char *name, unsigned int namelen) +{ + struct dlm_master_list_entry *tmpmle; + struct list_head *iter; + + assert_spin_locked(&dlm->master_lock); + + list_for_each(iter, &dlm->master_list) { + tmpmle = list_entry(iter, struct dlm_master_list_entry, list); + if (!dlm_mle_equal(dlm, tmpmle, name, namelen)) + continue; + dlm_get_mle(tmpmle); + *mle = tmpmle; + return 1; + } + return 0; +} + +void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up) +{ + struct dlm_master_list_entry *mle; + struct list_head *iter; + + assert_spin_locked(&dlm->spinlock); + + list_for_each(iter, &dlm->mle_hb_events) { + mle = list_entry(iter, struct dlm_master_list_entry, + hb_events); + if (node_up) + dlm_mle_node_up(dlm, mle, NULL, idx); + else + dlm_mle_node_down(dlm, mle, NULL, idx); + } +} + +static void dlm_mle_node_down(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle, + struct o2nm_node *node, int idx) +{ + spin_lock(&mle->spinlock); + + if (!test_bit(idx, mle->node_map)) + mlog(0, "node %u already removed from nodemap!\n", idx); + else + clear_bit(idx, mle->node_map); + + spin_unlock(&mle->spinlock); +} + +static void dlm_mle_node_up(struct dlm_ctxt *dlm, + struct dlm_master_list_entry *mle, + struct o2nm_node *node, int idx) +{ + spin_lock(&mle->spinlock); + + if (test_bit(idx, mle->node_map)) + mlog(0, "node %u already in node map!\n", idx); + else + set_bit(idx, mle->node_map); + + spin_unlock(&mle->spinlock); +} + + +int dlm_init_mle_cache(void) +{ + dlm_mle_cache = kmem_cache_create("dlm_mle_cache", + sizeof(struct dlm_master_list_entry), + 0, SLAB_HWCACHE_ALIGN, + NULL, NULL); + if (dlm_mle_cache == NULL) + return -ENOMEM; + return 0; +} + +void dlm_destroy_mle_cache(void) +{ + if (dlm_mle_cache) + kmem_cache_destroy(dlm_mle_cache); +} + +static void dlm_mle_release(struct kref *kref) +{ + struct dlm_master_list_entry *mle; + struct dlm_ctxt *dlm; + + mlog_entry_void(); + + mle = container_of(kref, struct dlm_master_list_entry, mle_refs); + dlm = mle->dlm; + + if (mle->type != DLM_MLE_MASTER) { + mlog(0, "calling mle_release for %.*s, type %d\n", + mle->u.name.len, mle->u.name.name, mle->type); + } else { + mlog(0, "calling mle_release for %.*s, type %d\n", + mle->u.res->lockname.len, + mle->u.res->lockname.name, mle->type); + } + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&dlm->master_lock); + + /* remove from list if not already */ + if (!list_empty(&mle->list)) + list_del_init(&mle->list); + + /* detach the mle from the domain node up/down events */ + __dlm_mle_detach_hb_events(dlm, mle); + + /* NOTE: kfree under spinlock here. + * if this is bad, we can move this to a freelist. */ + kmem_cache_free(dlm_mle_cache, mle); +} + + +/* + * LOCK RESOURCE FUNCTIONS + */ + +static void dlm_set_lockres_owner(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 owner) +{ + assert_spin_locked(&res->spinlock); + + mlog_entry("%.*s, %u\n", res->lockname.len, res->lockname.name, owner); + + if (owner == dlm->node_num) + atomic_inc(&dlm->local_resources); + else if (owner == DLM_LOCK_RES_OWNER_UNKNOWN) + atomic_inc(&dlm->unknown_resources); + else + atomic_inc(&dlm->remote_resources); + + res->owner = owner; +} + +void dlm_change_lockres_owner(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, u8 owner) +{ + assert_spin_locked(&res->spinlock); + + if (owner == res->owner) + return; + + if (res->owner == dlm->node_num) + atomic_dec(&dlm->local_resources); + else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) + atomic_dec(&dlm->unknown_resources); + else + atomic_dec(&dlm->remote_resources); + + dlm_set_lockres_owner(dlm, res, owner); +} + + +static void dlm_lockres_release(struct kref *kref) +{ + struct dlm_lock_resource *res; + + res = container_of(kref, struct dlm_lock_resource, refs); + + /* This should not happen -- all lockres' have a name + * associated with them at init time. */ + BUG_ON(!res->lockname.name); + + mlog(0, "destroying lockres %.*s\n", res->lockname.len, + res->lockname.name); + + /* By the time we're ready to blow this guy away, we shouldn't + * be on any lists. */ + BUG_ON(!list_empty(&res->list)); + BUG_ON(!list_empty(&res->granted)); + BUG_ON(!list_empty(&res->converting)); + BUG_ON(!list_empty(&res->blocked)); + BUG_ON(!list_empty(&res->dirty)); + BUG_ON(!list_empty(&res->recovering)); + BUG_ON(!list_empty(&res->purge)); + + kfree(res->lockname.name); + + kfree(res); +} + +void dlm_lockres_get(struct dlm_lock_resource *res) +{ + kref_get(&res->refs); +} + +void dlm_lockres_put(struct dlm_lock_resource *res) +{ + kref_put(&res->refs, dlm_lockres_release); +} + +static void dlm_init_lockres(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + const char *name, unsigned int namelen) +{ + char *qname; + + /* If we memset here, we lose our reference to the kmalloc'd + * res->lockname.name, so be sure to init every field + * correctly! */ + + qname = (char *) res->lockname.name; + memcpy(qname, name, namelen); + + res->lockname.len = namelen; + res->lockname.hash = full_name_hash(name, namelen); + + init_waitqueue_head(&res->wq); + spin_lock_init(&res->spinlock); + INIT_LIST_HEAD(&res->list); + INIT_LIST_HEAD(&res->granted); + INIT_LIST_HEAD(&res->converting); + INIT_LIST_HEAD(&res->blocked); + INIT_LIST_HEAD(&res->dirty); + INIT_LIST_HEAD(&res->recovering); + INIT_LIST_HEAD(&res->purge); + atomic_set(&res->asts_reserved, 0); + res->migration_pending = 0; + + kref_init(&res->refs); + + /* just for consistency */ + spin_lock(&res->spinlock); + dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN); + spin_unlock(&res->spinlock); + + res->state = DLM_LOCK_RES_IN_PROGRESS; + + res->last_used = 0; + + memset(res->lvb, 0, DLM_LVB_LEN); +} + +struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm, + const char *name, + unsigned int namelen) +{ + struct dlm_lock_resource *res; + + res = kmalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); + if (!res) + return NULL; + + res->lockname.name = kmalloc(namelen, GFP_KERNEL); + if (!res->lockname.name) { + kfree(res); + return NULL; + } + + dlm_init_lockres(dlm, res, name, namelen); + return res; +} + +/* + * lookup a lock resource by name. + * may already exist in the hashtable. + * lockid is null terminated + * + * if not, allocate enough for the lockres and for + * the temporary structure used in doing the mastering. + * + * also, do a lookup in the dlm->master_list to see + * if another node has begun mastering the same lock. + * if so, there should be a block entry in there + * for this name, and we should *not* attempt to master + * the lock here. need to wait around for that node + * to assert_master (or die). + * + */ +struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm, + const char *lockid, + int flags) +{ + struct dlm_lock_resource *tmpres=NULL, *res=NULL; + struct dlm_master_list_entry *mle = NULL; + struct dlm_master_list_entry *alloc_mle = NULL; + int blocked = 0; + int ret, nodenum; + struct dlm_node_iter iter; + unsigned int namelen; + int tries = 0; + + BUG_ON(!lockid); + + namelen = strlen(lockid); + + mlog(0, "get lockres %s (len %d)\n", lockid, namelen); + +lookup: + spin_lock(&dlm->spinlock); + tmpres = __dlm_lookup_lockres(dlm, lockid, namelen); + if (tmpres) { + spin_unlock(&dlm->spinlock); + mlog(0, "found in hash!\n"); + if (res) + dlm_lockres_put(res); + res = tmpres; + goto leave; + } + + if (!res) { + spin_unlock(&dlm->spinlock); + mlog(0, "allocating a new resource\n"); + /* nothing found and we need to allocate one. */ + alloc_mle = (struct dlm_master_list_entry *) + kmem_cache_alloc(dlm_mle_cache, GFP_KERNEL); + if (!alloc_mle) + goto leave; + res = dlm_new_lockres(dlm, lockid, namelen); + if (!res) + goto leave; + goto lookup; + } + + mlog(0, "no lockres found, allocated our own: %p\n", res); + + if (flags & LKM_LOCAL) { + /* caller knows it's safe to assume it's not mastered elsewhere + * DONE! return right away */ + spin_lock(&res->spinlock); + dlm_change_lockres_owner(dlm, res, dlm->node_num); + __dlm_insert_lockres(dlm, res); + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + /* lockres still marked IN_PROGRESS */ + goto wake_waiters; + } + + /* check master list to see if another node has started mastering it */ + spin_lock(&dlm->master_lock); + + /* if we found a block, wait for lock to be mastered by another node */ + blocked = dlm_find_mle(dlm, &mle, (char *)lockid, namelen); + if (blocked) { + if (mle->type == DLM_MLE_MASTER) { + mlog(ML_ERROR, "master entry for nonexistent lock!\n"); + BUG(); + } else if (mle->type == DLM_MLE_MIGRATION) { + /* migration is in progress! */ + /* the good news is that we now know the + * "current" master (mle->master). */ + + spin_unlock(&dlm->master_lock); + assert_spin_locked(&dlm->spinlock); + + /* set the lockres owner and hash it */ + spin_lock(&res->spinlock); + dlm_set_lockres_owner(dlm, res, mle->master); + __dlm_insert_lockres(dlm, res); + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + + /* master is known, detach */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + mle = NULL; + goto wake_waiters; + } + } else { + /* go ahead and try to master lock on this node */ + mle = alloc_mle; + /* make sure this does not get freed below */ + alloc_mle = NULL; + dlm_init_mle(mle, DLM_MLE_MASTER, dlm, res, NULL, 0); + set_bit(dlm->node_num, mle->maybe_map); + list_add(&mle->list, &dlm->master_list); + } + + /* at this point there is either a DLM_MLE_BLOCK or a + * DLM_MLE_MASTER on the master list, so it's safe to add the + * lockres to the hashtable. anyone who finds the lock will + * still have to wait on the IN_PROGRESS. */ + + /* finally add the lockres to its hash bucket */ + __dlm_insert_lockres(dlm, res); + /* get an extra ref on the mle in case this is a BLOCK + * if so, the creator of the BLOCK may try to put the last + * ref at this time in the assert master handler, so we + * need an extra one to keep from a bad ptr deref. */ + dlm_get_mle(mle); + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + /* must wait for lock to be mastered elsewhere */ + if (blocked) + goto wait; + +redo_request: + ret = -EINVAL; + dlm_node_iter_init(mle->vote_map, &iter); + while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { + ret = dlm_do_master_request(mle, nodenum); + if (ret < 0) + mlog_errno(ret); + if (mle->master != O2NM_MAX_NODES) { + /* found a master ! */ + break; + } + } + +wait: + /* keep going until the response map includes all nodes */ + ret = dlm_wait_for_lock_mastery(dlm, res, mle, &blocked); + if (ret < 0) { + mlog(0, "%s:%.*s: node map changed, redo the " + "master request now, blocked=%d\n", + dlm->name, res->lockname.len, + res->lockname.name, blocked); + if (++tries > 20) { + mlog(ML_ERROR, "%s:%.*s: spinning on " + "dlm_wait_for_lock_mastery, blocked=%d\n", + dlm->name, res->lockname.len, + res->lockname.name, blocked); + dlm_print_one_lock_resource(res); + /* dlm_print_one_mle(mle); */ + tries = 0; + } + goto redo_request; + } + + mlog(0, "lockres mastered by %u\n", res->owner); + /* make sure we never continue without this */ + BUG_ON(res->owner == O2NM_MAX_NODES); + + /* master is known, detach if not already detached */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + /* put the extra ref */ + dlm_put_mle(mle); + +wake_waiters: + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + spin_unlock(&res->spinlock); + wake_up(&res->wq); + +leave: + /* need to free the unused mle */ + if (alloc_mle) + kmem_cache_free(dlm_mle_cache, alloc_mle); + + return res; +} + + +#define DLM_MASTERY_TIMEOUT_MS 5000 + +static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + int *blocked) +{ + u8 m; + int ret, bit; + int map_changed, voting_done; + int assert, sleep; + +recheck: + ret = 0; + assert = 0; + + /* check if another node has already become the owner */ + spin_lock(&res->spinlock); + if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) { + spin_unlock(&res->spinlock); + goto leave; + } + spin_unlock(&res->spinlock); + + spin_lock(&mle->spinlock); + m = mle->master; + map_changed = (memcmp(mle->vote_map, mle->node_map, + sizeof(mle->vote_map)) != 0); + voting_done = (memcmp(mle->vote_map, mle->response_map, + sizeof(mle->vote_map)) == 0); + + /* restart if we hit any errors */ + if (map_changed) { + int b; + mlog(0, "%s: %.*s: node map changed, restarting\n", + dlm->name, res->lockname.len, res->lockname.name); + ret = dlm_restart_lock_mastery(dlm, res, mle, *blocked); + b = (mle->type == DLM_MLE_BLOCK); + if ((*blocked && !b) || (!*blocked && b)) { + mlog(0, "%s:%.*s: status change: old=%d new=%d\n", + dlm->name, res->lockname.len, res->lockname.name, + *blocked, b); + *blocked = b; + } + spin_unlock(&mle->spinlock); + if (ret < 0) { + mlog_errno(ret); + goto leave; + } + mlog(0, "%s:%.*s: restart lock mastery succeeded, " + "rechecking now\n", dlm->name, res->lockname.len, + res->lockname.name); + goto recheck; + } + + if (m != O2NM_MAX_NODES) { + /* another node has done an assert! + * all done! */ + sleep = 0; + } else { + sleep = 1; + /* have all nodes responded? */ + if (voting_done && !*blocked) { + bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0); + if (dlm->node_num <= bit) { + /* my node number is lowest. + * now tell other nodes that I am + * mastering this. */ + mle->master = dlm->node_num; + assert = 1; + sleep = 0; + } + /* if voting is done, but we have not received + * an assert master yet, we must sleep */ + } + } + + spin_unlock(&mle->spinlock); + + /* sleep if we haven't finished voting yet */ + if (sleep) { + unsigned long timeo = msecs_to_jiffies(DLM_MASTERY_TIMEOUT_MS); + + /* + if (atomic_read(&mle->mle_refs.refcount) < 2) + mlog(ML_ERROR, "mle (%p) refs=%d, name=%.*s\n", mle, + atomic_read(&mle->mle_refs.refcount), + res->lockname.len, res->lockname.name); + */ + atomic_set(&mle->woken, 0); + (void)wait_event_timeout(mle->wq, + (atomic_read(&mle->woken) == 1), + timeo); + if (res->owner == O2NM_MAX_NODES) { + mlog(0, "waiting again\n"); + goto recheck; + } + mlog(0, "done waiting, master is %u\n", res->owner); + ret = 0; + goto leave; + } + + ret = 0; /* done */ + if (assert) { + m = dlm->node_num; + mlog(0, "about to master %.*s here, this=%u\n", + res->lockname.len, res->lockname.name, m); + ret = dlm_do_assert_master(dlm, res->lockname.name, + res->lockname.len, mle->vote_map, 0); + if (ret) { + /* This is a failure in the network path, + * not in the response to the assert_master + * (any nonzero response is a BUG on this node). + * Most likely a socket just got disconnected + * due to node death. */ + mlog_errno(ret); + } + /* no longer need to restart lock mastery. + * all living nodes have been contacted. */ + ret = 0; + } + + /* set the lockres owner */ + spin_lock(&res->spinlock); + dlm_change_lockres_owner(dlm, res, m); + spin_unlock(&res->spinlock); + +leave: + return ret; +} + +struct dlm_bitmap_diff_iter +{ + int curnode; + unsigned long *orig_bm; + unsigned long *cur_bm; + unsigned long diff_bm[BITS_TO_LONGS(O2NM_MAX_NODES)]; +}; + +enum dlm_node_state_change +{ + NODE_DOWN = -1, + NODE_NO_CHANGE = 0, + NODE_UP +}; + +static void dlm_bitmap_diff_iter_init(struct dlm_bitmap_diff_iter *iter, + unsigned long *orig_bm, + unsigned long *cur_bm) +{ + unsigned long p1, p2; + int i; + + iter->curnode = -1; + iter->orig_bm = orig_bm; + iter->cur_bm = cur_bm; + + for (i = 0; i < BITS_TO_LONGS(O2NM_MAX_NODES); i++) { + p1 = *(iter->orig_bm + i); + p2 = *(iter->cur_bm + i); + iter->diff_bm[i] = (p1 & ~p2) | (p2 & ~p1); + } +} + +static int dlm_bitmap_diff_iter_next(struct dlm_bitmap_diff_iter *iter, + enum dlm_node_state_change *state) +{ + int bit; + + if (iter->curnode >= O2NM_MAX_NODES) + return -ENOENT; + + bit = find_next_bit(iter->diff_bm, O2NM_MAX_NODES, + iter->curnode+1); + if (bit >= O2NM_MAX_NODES) { + iter->curnode = O2NM_MAX_NODES; + return -ENOENT; + } + + /* if it was there in the original then this node died */ + if (test_bit(bit, iter->orig_bm)) + *state = NODE_DOWN; + else + *state = NODE_UP; + + iter->curnode = bit; + return bit; +} + + +static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + int blocked) +{ + struct dlm_bitmap_diff_iter bdi; + enum dlm_node_state_change sc; + int node; + int ret = 0; + + mlog(0, "something happened such that the " + "master process may need to be restarted!\n"); + + assert_spin_locked(&mle->spinlock); + + dlm_bitmap_diff_iter_init(&bdi, mle->vote_map, mle->node_map); + node = dlm_bitmap_diff_iter_next(&bdi, &sc); + while (node >= 0) { + if (sc == NODE_UP) { + /* a node came up. easy. might not even need + * to talk to it if its node number is higher + * or if we are already blocked. */ + mlog(0, "node up! %d\n", node); + if (blocked) + goto next; + + if (node > dlm->node_num) { + mlog(0, "node > this node. skipping.\n"); + goto next; + } + + /* redo the master request, but only for the new node */ + mlog(0, "sending request to new node\n"); + clear_bit(node, mle->response_map); + set_bit(node, mle->vote_map); + } else { + mlog(ML_ERROR, "node down! %d\n", node); + + /* if the node wasn't involved in mastery skip it, + * but clear it out from the maps so that it will + * not affect mastery of this lockres */ + clear_bit(node, mle->response_map); + clear_bit(node, mle->vote_map); + if (!test_bit(node, mle->maybe_map)) + goto next; + + /* if we're already blocked on lock mastery, and the + * dead node wasn't the expected master, or there is + * another node in the maybe_map, keep waiting */ + if (blocked) { + int lowest = find_next_bit(mle->maybe_map, + O2NM_MAX_NODES, 0); + + /* act like it was never there */ + clear_bit(node, mle->maybe_map); + + if (node != lowest) + goto next; + + mlog(ML_ERROR, "expected master %u died while " + "this node was blocked waiting on it!\n", + node); + lowest = find_next_bit(mle->maybe_map, + O2NM_MAX_NODES, + lowest+1); + if (lowest < O2NM_MAX_NODES) { + mlog(0, "still blocked. waiting " + "on %u now\n", lowest); + goto next; + } + + /* mle is an MLE_BLOCK, but there is now + * nothing left to block on. we need to return + * all the way back out and try again with + * an MLE_MASTER. dlm_do_local_recovery_cleanup + * has already run, so the mle refcount is ok */ + mlog(0, "no longer blocking. we can " + "try to master this here\n"); + mle->type = DLM_MLE_MASTER; + memset(mle->maybe_map, 0, + sizeof(mle->maybe_map)); + memset(mle->response_map, 0, + sizeof(mle->maybe_map)); + memcpy(mle->vote_map, mle->node_map, + sizeof(mle->node_map)); + mle->u.res = res; + set_bit(dlm->node_num, mle->maybe_map); + + ret = -EAGAIN; + goto next; + } + + clear_bit(node, mle->maybe_map); + if (node > dlm->node_num) + goto next; + + mlog(0, "dead node in map!\n"); + /* yuck. go back and re-contact all nodes + * in the vote_map, removing this node. */ + memset(mle->response_map, 0, + sizeof(mle->response_map)); + } + ret = -EAGAIN; +next: + node = dlm_bitmap_diff_iter_next(&bdi, &sc); + } + return ret; +} + + +/* + * DLM_MASTER_REQUEST_MSG + * + * returns: 0 on success, + * -errno on a network error + * + * on error, the caller should assume the target node is "dead" + * + */ + +static int dlm_do_master_request(struct dlm_master_list_entry *mle, int to) +{ + struct dlm_ctxt *dlm = mle->dlm; + struct dlm_master_request request; + int ret, response=0, resend; + + memset(&request, 0, sizeof(request)); + request.node_idx = dlm->node_num; + + BUG_ON(mle->type == DLM_MLE_MIGRATION); + + if (mle->type != DLM_MLE_MASTER) { + request.namelen = mle->u.name.len; + memcpy(request.name, mle->u.name.name, request.namelen); + } else { + request.namelen = mle->u.res->lockname.len; + memcpy(request.name, mle->u.res->lockname.name, + request.namelen); + } + +again: + ret = o2net_send_message(DLM_MASTER_REQUEST_MSG, dlm->key, &request, + sizeof(request), to, &response); + if (ret < 0) { + if (ret == -ESRCH) { + /* should never happen */ + mlog(ML_ERROR, "TCP stack not ready!\n"); + BUG(); + } else if (ret == -EINVAL) { + mlog(ML_ERROR, "bad args passed to o2net!\n"); + BUG(); + } else if (ret == -ENOMEM) { + mlog(ML_ERROR, "out of memory while trying to send " + "network message! retrying\n"); + /* this is totally crude */ + msleep(50); + goto again; + } else if (!dlm_is_host_down(ret)) { + /* not a network error. bad. */ + mlog_errno(ret); + mlog(ML_ERROR, "unhandled error!"); + BUG(); + } + /* all other errors should be network errors, + * and likely indicate node death */ + mlog(ML_ERROR, "link to %d went down!\n", to); + goto out; + } + + ret = 0; + resend = 0; + spin_lock(&mle->spinlock); + switch (response) { + case DLM_MASTER_RESP_YES: + set_bit(to, mle->response_map); + mlog(0, "node %u is the master, response=YES\n", to); + mle->master = to; + break; + case DLM_MASTER_RESP_NO: + mlog(0, "node %u not master, response=NO\n", to); + set_bit(to, mle->response_map); + break; + case DLM_MASTER_RESP_MAYBE: + mlog(0, "node %u not master, response=MAYBE\n", to); + set_bit(to, mle->response_map); + set_bit(to, mle->maybe_map); + break; + case DLM_MASTER_RESP_ERROR: + mlog(0, "node %u hit an error, resending\n", to); + resend = 1; + response = 0; + break; + default: + mlog(ML_ERROR, "bad response! %u\n", response); + BUG(); + } + spin_unlock(&mle->spinlock); + if (resend) { + /* this is also totally crude */ + msleep(50); + goto again; + } + +out: + return ret; +} + +/* + * locks that can be taken here: + * dlm->spinlock + * res->spinlock + * mle->spinlock + * dlm->master_list + * + * if possible, TRIM THIS DOWN!!! + */ +int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data) +{ + u8 response = DLM_MASTER_RESP_MAYBE; + struct dlm_ctxt *dlm = data; + struct dlm_lock_resource *res; + struct dlm_master_request *request = (struct dlm_master_request *) msg->buf; + struct dlm_master_list_entry *mle = NULL, *tmpmle = NULL; + char *name; + unsigned int namelen; + int found, ret; + int set_maybe; + + if (!dlm_grab(dlm)) + return DLM_MASTER_RESP_NO; + + if (!dlm_domain_fully_joined(dlm)) { + response = DLM_MASTER_RESP_NO; + goto send_response; + } + + name = request->name; + namelen = request->namelen; + + if (namelen > DLM_LOCKID_NAME_MAX) { + response = DLM_IVBUFLEN; + goto send_response; + } + +way_up_top: + spin_lock(&dlm->spinlock); + res = __dlm_lookup_lockres(dlm, name, namelen); + if (res) { + spin_unlock(&dlm->spinlock); + + /* take care of the easy cases up front */ + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + spin_unlock(&res->spinlock); + mlog(0, "returning DLM_MASTER_RESP_ERROR since res is " + "being recovered\n"); + response = DLM_MASTER_RESP_ERROR; + if (mle) + kmem_cache_free(dlm_mle_cache, mle); + goto send_response; + } + + if (res->owner == dlm->node_num) { + u32 flags = DLM_ASSERT_MASTER_MLE_CLEANUP; + spin_unlock(&res->spinlock); + // mlog(0, "this node is the master\n"); + response = DLM_MASTER_RESP_YES; + if (mle) + kmem_cache_free(dlm_mle_cache, mle); + + /* this node is the owner. + * there is some extra work that needs to + * happen now. the requesting node has + * caused all nodes up to this one to + * create mles. this node now needs to + * go back and clean those up. */ + mlog(0, "%u is the owner of %.*s, cleaning everyone else\n", + dlm->node_num, res->lockname.len, res->lockname.name); + ret = dlm_dispatch_assert_master(dlm, res, 1, + request->node_idx, + flags); + if (ret < 0) { + mlog(ML_ERROR, "failed to dispatch assert " + "master work\n"); + response = DLM_MASTER_RESP_ERROR; + } + goto send_response; + } else if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) { + spin_unlock(&res->spinlock); + // mlog(0, "node %u is the master\n", res->owner); + response = DLM_MASTER_RESP_NO; + if (mle) + kmem_cache_free(dlm_mle_cache, mle); + goto send_response; + } + + /* ok, there is no owner. either this node is + * being blocked, or it is actively trying to + * master this lock. */ + if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) { + mlog(ML_ERROR, "lock with no owner should be " + "in-progress!\n"); + BUG(); + } + + // mlog(0, "lockres is in progress...\n"); + spin_lock(&dlm->master_lock); + found = dlm_find_mle(dlm, &tmpmle, name, namelen); + if (!found) { + mlog(ML_ERROR, "no mle found for this lock!\n"); + BUG(); + } + set_maybe = 1; + spin_lock(&tmpmle->spinlock); + if (tmpmle->type == DLM_MLE_BLOCK) { + // mlog(0, "this node is waiting for " + // "lockres to be mastered\n"); + response = DLM_MASTER_RESP_NO; + } else if (tmpmle->type == DLM_MLE_MIGRATION) { + mlog(0, "node %u is master, but trying to migrate to " + "node %u.\n", tmpmle->master, tmpmle->new_master); + if (tmpmle->master == dlm->node_num) { + response = DLM_MASTER_RESP_YES; + mlog(ML_ERROR, "no owner on lockres, but this " + "node is trying to migrate it to %u?!\n", + tmpmle->new_master); + BUG(); + } else { + /* the real master can respond on its own */ + response = DLM_MASTER_RESP_NO; + } + } else if (tmpmle->master != DLM_LOCK_RES_OWNER_UNKNOWN) { + set_maybe = 0; + if (tmpmle->master == dlm->node_num) + response = DLM_MASTER_RESP_YES; + else + response = DLM_MASTER_RESP_NO; + } else { + // mlog(0, "this node is attempting to " + // "master lockres\n"); + response = DLM_MASTER_RESP_MAYBE; + } + if (set_maybe) + set_bit(request->node_idx, tmpmle->maybe_map); + spin_unlock(&tmpmle->spinlock); + + spin_unlock(&dlm->master_lock); + spin_unlock(&res->spinlock); + + /* keep the mle attached to heartbeat events */ + dlm_put_mle(tmpmle); + if (mle) + kmem_cache_free(dlm_mle_cache, mle); + goto send_response; + } + + /* + * lockres doesn't exist on this node + * if there is an MLE_BLOCK, return NO + * if there is an MLE_MASTER, return MAYBE + * otherwise, add an MLE_BLOCK, return NO + */ + spin_lock(&dlm->master_lock); + found = dlm_find_mle(dlm, &tmpmle, name, namelen); + if (!found) { + /* this lockid has never been seen on this node yet */ + // mlog(0, "no mle found\n"); + if (!mle) { + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + mle = (struct dlm_master_list_entry *) + kmem_cache_alloc(dlm_mle_cache, GFP_KERNEL); + if (!mle) { + // bad bad bad... this sucks. + response = DLM_MASTER_RESP_ERROR; + goto send_response; + } + spin_lock(&dlm->spinlock); + dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL, + name, namelen); + spin_unlock(&dlm->spinlock); + goto way_up_top; + } + + // mlog(0, "this is second time thru, already allocated, " + // "add the block.\n"); + set_bit(request->node_idx, mle->maybe_map); + list_add(&mle->list, &dlm->master_list); + response = DLM_MASTER_RESP_NO; + } else { + // mlog(0, "mle was found\n"); + set_maybe = 1; + spin_lock(&tmpmle->spinlock); + if (tmpmle->type == DLM_MLE_BLOCK) + response = DLM_MASTER_RESP_NO; + else if (tmpmle->type == DLM_MLE_MIGRATION) { + mlog(0, "migration mle was found (%u->%u)\n", + tmpmle->master, tmpmle->new_master); + if (tmpmle->master == dlm->node_num) { + mlog(ML_ERROR, "no lockres, but migration mle " + "says that this node is master!\n"); + BUG(); + } + /* real master can respond on its own */ + response = DLM_MASTER_RESP_NO; + } else { + if (tmpmle->master == dlm->node_num) { + response = DLM_MASTER_RESP_YES; + set_maybe = 0; + } else + response = DLM_MASTER_RESP_MAYBE; + } + if (set_maybe) + set_bit(request->node_idx, tmpmle->maybe_map); + spin_unlock(&tmpmle->spinlock); + } + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + if (found) { + /* keep the mle attached to heartbeat events */ + dlm_put_mle(tmpmle); + } +send_response: + dlm_put(dlm); + return response; +} + +/* + * DLM_ASSERT_MASTER_MSG + */ + + +/* + * NOTE: this can be used for debugging + * can periodically run all locks owned by this node + * and re-assert across the cluster... + */ +static int dlm_do_assert_master(struct dlm_ctxt *dlm, const char *lockname, + unsigned int namelen, void *nodemap, + u32 flags) +{ + struct dlm_assert_master assert; + int to, tmpret; + struct dlm_node_iter iter; + int ret = 0; + + BUG_ON(namelen > O2NM_MAX_NAME_LEN); + + /* note that if this nodemap is empty, it returns 0 */ + dlm_node_iter_init(nodemap, &iter); + while ((to = dlm_node_iter_next(&iter)) >= 0) { + int r = 0; + mlog(0, "sending assert master to %d (%.*s)\n", to, + namelen, lockname); + memset(&assert, 0, sizeof(assert)); + assert.node_idx = dlm->node_num; + assert.namelen = namelen; + memcpy(assert.name, lockname, namelen); + assert.flags = cpu_to_be32(flags); + + tmpret = o2net_send_message(DLM_ASSERT_MASTER_MSG, dlm->key, + &assert, sizeof(assert), to, &r); + if (tmpret < 0) { + mlog(ML_ERROR, "assert_master returned %d!\n", tmpret); + if (!dlm_is_host_down(tmpret)) { + mlog(ML_ERROR, "unhandled error!\n"); + BUG(); + } + /* a node died. finish out the rest of the nodes. */ + mlog(ML_ERROR, "link to %d went down!\n", to); + /* any nonzero status return will do */ + ret = tmpret; + } else if (r < 0) { + /* ok, something horribly messed. kill thyself. */ + mlog(ML_ERROR,"during assert master of %.*s to %u, " + "got %d.\n", namelen, lockname, to, r); + dlm_dump_lock_resources(dlm); + BUG(); + } + } + + return ret; +} + +/* + * locks that can be taken here: + * dlm->spinlock + * res->spinlock + * mle->spinlock + * dlm->master_list + * + * if possible, TRIM THIS DOWN!!! + */ +int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_master_list_entry *mle = NULL; + struct dlm_assert_master *assert = (struct dlm_assert_master *)msg->buf; + struct dlm_lock_resource *res = NULL; + char *name; + unsigned int namelen; + u32 flags; + + if (!dlm_grab(dlm)) + return 0; + + name = assert->name; + namelen = assert->namelen; + flags = be32_to_cpu(assert->flags); + + if (namelen > DLM_LOCKID_NAME_MAX) { + mlog(ML_ERROR, "Invalid name length!"); + goto done; + } + + spin_lock(&dlm->spinlock); + + if (flags) + mlog(0, "assert_master with flags: %u\n", flags); + + /* find the MLE */ + spin_lock(&dlm->master_lock); + if (!dlm_find_mle(dlm, &mle, name, namelen)) { + /* not an error, could be master just re-asserting */ + mlog(0, "just got an assert_master from %u, but no " + "MLE for it! (%.*s)\n", assert->node_idx, + namelen, name); + } else { + int bit = find_next_bit (mle->maybe_map, O2NM_MAX_NODES, 0); + if (bit >= O2NM_MAX_NODES) { + /* not necessarily an error, though less likely. + * could be master just re-asserting. */ + mlog(ML_ERROR, "no bits set in the maybe_map, but %u " + "is asserting! (%.*s)\n", assert->node_idx, + namelen, name); + } else if (bit != assert->node_idx) { + if (flags & DLM_ASSERT_MASTER_MLE_CLEANUP) { + mlog(0, "master %u was found, %u should " + "back off\n", assert->node_idx, bit); + } else { + /* with the fix for bug 569, a higher node + * number winning the mastery will respond + * YES to mastery requests, but this node + * had no way of knowing. let it pass. */ + mlog(ML_ERROR, "%u is the lowest node, " + "%u is asserting. (%.*s) %u must " + "have begun after %u won.\n", bit, + assert->node_idx, namelen, name, bit, + assert->node_idx); + } + } + } + spin_unlock(&dlm->master_lock); + + /* ok everything checks out with the MLE + * now check to see if there is a lockres */ + res = __dlm_lookup_lockres(dlm, name, namelen); + if (res) { + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + mlog(ML_ERROR, "%u asserting but %.*s is " + "RECOVERING!\n", assert->node_idx, namelen, name); + goto kill; + } + if (!mle) { + if (res->owner != assert->node_idx) { + mlog(ML_ERROR, "assert_master from " + "%u, but current owner is " + "%u! (%.*s)\n", + assert->node_idx, res->owner, + namelen, name); + goto kill; + } + } else if (mle->type != DLM_MLE_MIGRATION) { + if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) { + /* owner is just re-asserting */ + if (res->owner == assert->node_idx) { + mlog(0, "owner %u re-asserting on " + "lock %.*s\n", assert->node_idx, + namelen, name); + goto ok; + } + mlog(ML_ERROR, "got assert_master from " + "node %u, but %u is the owner! " + "(%.*s)\n", assert->node_idx, + res->owner, namelen, name); + goto kill; + } + if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) { + mlog(ML_ERROR, "got assert from %u, but lock " + "with no owner should be " + "in-progress! (%.*s)\n", + assert->node_idx, + namelen, name); + goto kill; + } + } else /* mle->type == DLM_MLE_MIGRATION */ { + /* should only be getting an assert from new master */ + if (assert->node_idx != mle->new_master) { + mlog(ML_ERROR, "got assert from %u, but " + "new master is %u, and old master " + "was %u (%.*s)\n", + assert->node_idx, mle->new_master, + mle->master, namelen, name); + goto kill; + } + + } +ok: + spin_unlock(&res->spinlock); + } + spin_unlock(&dlm->spinlock); + + // mlog(0, "woo! got an assert_master from node %u!\n", + // assert->node_idx); + if (mle) { + int extra_ref; + + spin_lock(&mle->spinlock); + extra_ref = !!(mle->type == DLM_MLE_BLOCK + || mle->type == DLM_MLE_MIGRATION); + mle->master = assert->node_idx; + atomic_set(&mle->woken, 1); + wake_up(&mle->wq); + spin_unlock(&mle->spinlock); + + if (mle->type == DLM_MLE_MIGRATION && res) { + mlog(0, "finishing off migration of lockres %.*s, " + "from %u to %u\n", + res->lockname.len, res->lockname.name, + dlm->node_num, mle->new_master); + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_MIGRATING; + dlm_change_lockres_owner(dlm, res, mle->new_master); + BUG_ON(res->state & DLM_LOCK_RES_DIRTY); + spin_unlock(&res->spinlock); + } + /* master is known, detach if not already detached */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + + if (extra_ref) { + /* the assert master message now balances the extra + * ref given by the master / migration request message. + * if this is the last put, it will be removed + * from the list. */ + dlm_put_mle(mle); + } + } + +done: + if (res) + dlm_lockres_put(res); + dlm_put(dlm); + return 0; + +kill: + /* kill the caller! */ + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + dlm_lockres_put(res); + mlog(ML_ERROR, "Bad message received from another node. Dumping state " + "and killing the other node now! This node is OK and can continue.\n"); + dlm_dump_lock_resources(dlm); + dlm_put(dlm); + return -EINVAL; +} + +int dlm_dispatch_assert_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + int ignore_higher, u8 request_from, u32 flags) +{ + struct dlm_work_item *item; + item = kcalloc(1, sizeof(*item), GFP_KERNEL); + if (!item) + return -ENOMEM; + + + /* queue up work for dlm_assert_master_worker */ + dlm_grab(dlm); /* get an extra ref for the work item */ + dlm_init_work_item(dlm, item, dlm_assert_master_worker, NULL); + item->u.am.lockres = res; /* already have a ref */ + /* can optionally ignore node numbers higher than this node */ + item->u.am.ignore_higher = ignore_higher; + item->u.am.request_from = request_from; + item->u.am.flags = flags; + + spin_lock(&dlm->work_lock); + list_add_tail(&item->list, &dlm->work_list); + spin_unlock(&dlm->work_lock); + + schedule_work(&dlm->dispatched_work); + return 0; +} + +static void dlm_assert_master_worker(struct dlm_work_item *item, void *data) +{ + struct dlm_ctxt *dlm = data; + int ret = 0; + struct dlm_lock_resource *res; + unsigned long nodemap[BITS_TO_LONGS(O2NM_MAX_NODES)]; + int ignore_higher; + int bit; + u8 request_from; + u32 flags; + + dlm = item->dlm; + res = item->u.am.lockres; + ignore_higher = item->u.am.ignore_higher; + request_from = item->u.am.request_from; + flags = item->u.am.flags; + + spin_lock(&dlm->spinlock); + memcpy(nodemap, dlm->domain_map, sizeof(nodemap)); + spin_unlock(&dlm->spinlock); + + clear_bit(dlm->node_num, nodemap); + if (ignore_higher) { + /* if is this just to clear up mles for nodes below + * this node, do not send the message to the original + * caller or any node number higher than this */ + clear_bit(request_from, nodemap); + bit = dlm->node_num; + while (1) { + bit = find_next_bit(nodemap, O2NM_MAX_NODES, + bit+1); + if (bit >= O2NM_MAX_NODES) + break; + clear_bit(bit, nodemap); + } + } + + /* this call now finishes out the nodemap + * even if one or more nodes die */ + mlog(0, "worker about to master %.*s here, this=%u\n", + res->lockname.len, res->lockname.name, dlm->node_num); + ret = dlm_do_assert_master(dlm, res->lockname.name, + res->lockname.len, + nodemap, flags); + if (ret < 0) { + /* no need to restart, we are done */ + mlog_errno(ret); + } + + dlm_lockres_put(res); + + mlog(0, "finished with dlm_assert_master_worker\n"); +} + + +/* + * DLM_MIGRATE_LOCKRES + */ + + +int dlm_migrate_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + u8 target) +{ + struct dlm_master_list_entry *mle = NULL; + struct dlm_master_list_entry *oldmle = NULL; + struct dlm_migratable_lockres *mres = NULL; + int ret = -EINVAL; + const char *name; + unsigned int namelen; + int mle_added = 0; + struct list_head *queue, *iter; + int i; + struct dlm_lock *lock; + int empty = 1; + + if (!dlm_grab(dlm)) + return -EINVAL; + + name = res->lockname.name; + namelen = res->lockname.len; + + mlog(0, "migrating %.*s to %u\n", namelen, name, target); + + /* + * ensure this lockres is a proper candidate for migration + */ + spin_lock(&res->spinlock); + if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "cannot migrate lockres with unknown owner!\n"); + spin_unlock(&res->spinlock); + goto leave; + } + if (res->owner != dlm->node_num) { + mlog(0, "cannot migrate lockres this node doesn't own!\n"); + spin_unlock(&res->spinlock); + goto leave; + } + mlog(0, "checking queues...\n"); + queue = &res->granted; + for (i=0; i<3; i++) { + list_for_each(iter, queue) { + lock = list_entry (iter, struct dlm_lock, list); + empty = 0; + if (lock->ml.node == dlm->node_num) { + mlog(0, "found a lock owned by this node " + "still on the %s queue! will not " + "migrate this lockres\n", + i==0 ? "granted" : + (i==1 ? "converting" : "blocked")); + spin_unlock(&res->spinlock); + ret = -ENOTEMPTY; + goto leave; + } + } + queue++; + } + mlog(0, "all locks on this lockres are nonlocal. continuing\n"); + spin_unlock(&res->spinlock); + + /* no work to do */ + if (empty) { + mlog(0, "no locks were found on this lockres! done!\n"); + ret = 0; + goto leave; + } + + /* + * preallocate up front + * if this fails, abort + */ + + ret = -ENOMEM; + mres = (struct dlm_migratable_lockres *) __get_free_page(GFP_KERNEL); + if (!mres) { + mlog_errno(ret); + goto leave; + } + + mle = (struct dlm_master_list_entry *) kmem_cache_alloc(dlm_mle_cache, + GFP_KERNEL); + if (!mle) { + mlog_errno(ret); + goto leave; + } + ret = 0; + + /* + * find a node to migrate the lockres to + */ + + mlog(0, "picking a migration node\n"); + spin_lock(&dlm->spinlock); + /* pick a new node */ + if (!test_bit(target, dlm->domain_map) || + target >= O2NM_MAX_NODES) { + target = dlm_pick_migration_target(dlm, res); + } + mlog(0, "node %u chosen for migration\n", target); + + if (target >= O2NM_MAX_NODES || + !test_bit(target, dlm->domain_map)) { + /* target chosen is not alive */ + ret = -EINVAL; + } + + if (ret) { + spin_unlock(&dlm->spinlock); + goto fail; + } + + mlog(0, "continuing with target = %u\n", target); + + /* + * clear any existing master requests and + * add the migration mle to the list + */ + spin_lock(&dlm->master_lock); + ret = dlm_add_migration_mle(dlm, res, mle, &oldmle, name, + namelen, target, dlm->node_num); + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + if (ret == -EEXIST) { + mlog(0, "another process is already migrating it\n"); + goto fail; + } + mle_added = 1; + + /* + * set the MIGRATING flag and flush asts + * if we fail after this we need to re-dirty the lockres + */ + if (dlm_mark_lockres_migrating(dlm, res, target) < 0) { + mlog(ML_ERROR, "tried to migrate %.*s to %u, but " + "the target went down.\n", res->lockname.len, + res->lockname.name, target); + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_MIGRATING; + spin_unlock(&res->spinlock); + ret = -EINVAL; + } + +fail: + if (oldmle) { + /* master is known, detach if not already detached */ + dlm_mle_detach_hb_events(dlm, oldmle); + dlm_put_mle(oldmle); + } + + if (ret < 0) { + if (mle_added) { + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + } else if (mle) { + kmem_cache_free(dlm_mle_cache, mle); + } + goto leave; + } + + /* + * at this point, we have a migration target, an mle + * in the master list, and the MIGRATING flag set on + * the lockres + */ + + + /* get an extra reference on the mle. + * otherwise the assert_master from the new + * master will destroy this. + * also, make sure that all callers of dlm_get_mle + * take both dlm->spinlock and dlm->master_lock */ + spin_lock(&dlm->spinlock); + spin_lock(&dlm->master_lock); + dlm_get_mle(mle); + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + /* notify new node and send all lock state */ + /* call send_one_lockres with migration flag. + * this serves as notice to the target node that a + * migration is starting. */ + ret = dlm_send_one_lockres(dlm, res, mres, target, + DLM_MRES_MIGRATION); + + if (ret < 0) { + mlog(0, "migration to node %u failed with %d\n", + target, ret); + /* migration failed, detach and clean up mle */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + dlm_put_mle(mle); + goto leave; + } + + /* at this point, the target sends a message to all nodes, + * (using dlm_do_migrate_request). this node is skipped since + * we had to put an mle in the list to begin the process. this + * node now waits for target to do an assert master. this node + * will be the last one notified, ensuring that the migration + * is complete everywhere. if the target dies while this is + * going on, some nodes could potentially see the target as the + * master, so it is important that my recovery finds the migration + * mle and sets the master to UNKNONWN. */ + + + /* wait for new node to assert master */ + while (1) { + ret = wait_event_interruptible_timeout(mle->wq, + (atomic_read(&mle->woken) == 1), + msecs_to_jiffies(5000)); + + if (ret >= 0) { + if (atomic_read(&mle->woken) == 1 || + res->owner == target) + break; + + mlog(0, "timed out during migration\n"); + } + if (ret == -ERESTARTSYS) { + /* migration failed, detach and clean up mle */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + dlm_put_mle(mle); + goto leave; + } + /* TODO: if node died: stop, clean up, return error */ + } + + /* all done, set the owner, clear the flag */ + spin_lock(&res->spinlock); + dlm_set_lockres_owner(dlm, res, target); + res->state &= ~DLM_LOCK_RES_MIGRATING; + dlm_remove_nonlocal_locks(dlm, res); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + + /* master is known, detach if not already detached */ + dlm_mle_detach_hb_events(dlm, mle); + dlm_put_mle(mle); + ret = 0; + + dlm_lockres_calc_usage(dlm, res); + +leave: + /* re-dirty the lockres if we failed */ + if (ret < 0) + dlm_kick_thread(dlm, res); + + /* TODO: cleanup */ + if (mres) + free_page((unsigned long)mres); + + dlm_put(dlm); + + mlog(0, "returning %d\n", ret); + return ret; +} +EXPORT_SYMBOL_GPL(dlm_migrate_lockres); + +int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock) +{ + int ret; + spin_lock(&dlm->ast_lock); + spin_lock(&lock->spinlock); + ret = (list_empty(&lock->bast_list) && !lock->bast_pending); + spin_unlock(&lock->spinlock); + spin_unlock(&dlm->ast_lock); + return ret; +} + +static int dlm_migration_can_proceed(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 mig_target) +{ + int can_proceed; + spin_lock(&res->spinlock); + can_proceed = !!(res->state & DLM_LOCK_RES_MIGRATING); + spin_unlock(&res->spinlock); + + /* target has died, so make the caller break out of the + * wait_event, but caller must recheck the domain_map */ + spin_lock(&dlm->spinlock); + if (!test_bit(mig_target, dlm->domain_map)) + can_proceed = 1; + spin_unlock(&dlm->spinlock); + return can_proceed; +} + +int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) +{ + int ret; + spin_lock(&res->spinlock); + ret = !!(res->state & DLM_LOCK_RES_DIRTY); + spin_unlock(&res->spinlock); + return ret; +} + + +static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 target) +{ + int ret = 0; + + mlog(0, "dlm_mark_lockres_migrating: %.*s, from %u to %u\n", + res->lockname.len, res->lockname.name, dlm->node_num, + target); + /* need to set MIGRATING flag on lockres. this is done by + * ensuring that all asts have been flushed for this lockres. */ + spin_lock(&res->spinlock); + BUG_ON(res->migration_pending); + res->migration_pending = 1; + /* strategy is to reserve an extra ast then release + * it below, letting the release do all of the work */ + __dlm_lockres_reserve_ast(res); + spin_unlock(&res->spinlock); + + /* now flush all the pending asts.. hang out for a bit */ + dlm_kick_thread(dlm, res); + wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res)); + dlm_lockres_release_ast(dlm, res); + + mlog(0, "about to wait on migration_wq, dirty=%s\n", + res->state & DLM_LOCK_RES_DIRTY ? "yes" : "no"); + /* if the extra ref we just put was the final one, this + * will pass thru immediately. otherwise, we need to wait + * for the last ast to finish. */ +again: + ret = wait_event_interruptible_timeout(dlm->migration_wq, + dlm_migration_can_proceed(dlm, res, target), + msecs_to_jiffies(1000)); + if (ret < 0) { + mlog(0, "woken again: migrating? %s, dead? %s\n", + res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no", + test_bit(target, dlm->domain_map) ? "no":"yes"); + } else { + mlog(0, "all is well: migrating? %s, dead? %s\n", + res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no", + test_bit(target, dlm->domain_map) ? "no":"yes"); + } + if (!dlm_migration_can_proceed(dlm, res, target)) { + mlog(0, "trying again...\n"); + goto again; + } + + /* did the target go down or die? */ + spin_lock(&dlm->spinlock); + if (!test_bit(target, dlm->domain_map)) { + mlog(ML_ERROR, "aha. migration target %u just went down\n", + target); + ret = -EHOSTDOWN; + } + spin_unlock(&dlm->spinlock); + + /* + * at this point: + * + * o the DLM_LOCK_RES_MIGRATING flag is set + * o there are no pending asts on this lockres + * o all processes trying to reserve an ast on this + * lockres must wait for the MIGRATING flag to clear + */ + return ret; +} + +/* last step in the migration process. + * original master calls this to free all of the dlm_lock + * structures that used to be for other nodes. */ +static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + struct list_head *iter, *iter2; + struct list_head *queue = &res->granted; + int i; + struct dlm_lock *lock; + + assert_spin_locked(&res->spinlock); + + BUG_ON(res->owner == dlm->node_num); + + for (i=0; i<3; i++) { + list_for_each_safe(iter, iter2, queue) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node != dlm->node_num) { + mlog(0, "putting lock for node %u\n", + lock->ml.node); + /* be extra careful */ + BUG_ON(!list_empty(&lock->ast_list)); + BUG_ON(!list_empty(&lock->bast_list)); + BUG_ON(lock->ast_pending); + BUG_ON(lock->bast_pending); + list_del_init(&lock->list); + dlm_lock_put(lock); + } + } + queue++; + } +} + +/* for now this is not too intelligent. we will + * need stats to make this do the right thing. + * this just finds the first lock on one of the + * queues and uses that node as the target. */ +static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + int i; + struct list_head *queue = &res->granted; + struct list_head *iter; + struct dlm_lock *lock; + int nodenum; + + assert_spin_locked(&dlm->spinlock); + + spin_lock(&res->spinlock); + for (i=0; i<3; i++) { + list_for_each(iter, queue) { + /* up to the caller to make sure this node + * is alive */ + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node != dlm->node_num) { + spin_unlock(&res->spinlock); + return lock->ml.node; + } + } + queue++; + } + spin_unlock(&res->spinlock); + mlog(0, "have not found a suitable target yet! checking domain map\n"); + + /* ok now we're getting desperate. pick anyone alive. */ + nodenum = -1; + while (1) { + nodenum = find_next_bit(dlm->domain_map, + O2NM_MAX_NODES, nodenum+1); + mlog(0, "found %d in domain map\n", nodenum); + if (nodenum >= O2NM_MAX_NODES) + break; + if (nodenum != dlm->node_num) { + mlog(0, "picking %d\n", nodenum); + return nodenum; + } + } + + mlog(0, "giving up. no master to migrate to\n"); + return DLM_LOCK_RES_OWNER_UNKNOWN; +} + + + +/* this is called by the new master once all lockres + * data has been received */ +static int dlm_do_migrate_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 master, u8 new_master, + struct dlm_node_iter *iter) +{ + struct dlm_migrate_request migrate; + int ret, status = 0; + int nodenum; + + memset(&migrate, 0, sizeof(migrate)); + migrate.namelen = res->lockname.len; + memcpy(migrate.name, res->lockname.name, migrate.namelen); + migrate.new_master = new_master; + migrate.master = master; + + ret = 0; + + /* send message to all nodes, except the master and myself */ + while ((nodenum = dlm_node_iter_next(iter)) >= 0) { + if (nodenum == master || + nodenum == new_master) + continue; + + ret = o2net_send_message(DLM_MIGRATE_REQUEST_MSG, dlm->key, + &migrate, sizeof(migrate), nodenum, + &status); + if (ret < 0) + mlog_errno(ret); + else if (status < 0) { + mlog(0, "migrate request (node %u) returned %d!\n", + nodenum, status); + ret = status; + } + } + + if (ret < 0) + mlog_errno(ret); + + mlog(0, "returning ret=%d\n", ret); + return ret; +} + + +/* if there is an existing mle for this lockres, we now know who the master is. + * (the one who sent us *this* message) we can clear it up right away. + * since the process that put the mle on the list still has a reference to it, + * we can unhash it now, set the master and wake the process. as a result, + * we will have no mle in the list to start with. now we can add an mle for + * the migration and this should be the only one found for those scanning the + * list. */ +int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_lock_resource *res = NULL; + struct dlm_migrate_request *migrate = (struct dlm_migrate_request *) msg->buf; + struct dlm_master_list_entry *mle = NULL, *oldmle = NULL; + const char *name; + unsigned int namelen; + int ret = 0; + + if (!dlm_grab(dlm)) + return -EINVAL; + + name = migrate->name; + namelen = migrate->namelen; + + /* preallocate.. if this fails, abort */ + mle = (struct dlm_master_list_entry *) kmem_cache_alloc(dlm_mle_cache, + GFP_KERNEL); + + if (!mle) { + ret = -ENOMEM; + goto leave; + } + + /* check for pre-existing lock */ + spin_lock(&dlm->spinlock); + res = __dlm_lookup_lockres(dlm, name, namelen); + spin_lock(&dlm->master_lock); + + if (res) { + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + /* if all is working ok, this can only mean that we got + * a migrate request from a node that we now see as + * dead. what can we do here? drop it to the floor? */ + spin_unlock(&res->spinlock); + mlog(ML_ERROR, "Got a migrate request, but the " + "lockres is marked as recovering!"); + kmem_cache_free(dlm_mle_cache, mle); + ret = -EINVAL; /* need a better solution */ + goto unlock; + } + res->state |= DLM_LOCK_RES_MIGRATING; + spin_unlock(&res->spinlock); + } + + /* ignore status. only nonzero status would BUG. */ + ret = dlm_add_migration_mle(dlm, res, mle, &oldmle, + name, namelen, + migrate->new_master, + migrate->master); + +unlock: + spin_unlock(&dlm->master_lock); + spin_unlock(&dlm->spinlock); + + if (oldmle) { + /* master is known, detach if not already detached */ + dlm_mle_detach_hb_events(dlm, oldmle); + dlm_put_mle(oldmle); + } + + if (res) + dlm_lockres_put(res); +leave: + dlm_put(dlm); + return ret; +} + +/* must be holding dlm->spinlock and dlm->master_lock + * when adding a migration mle, we can clear any other mles + * in the master list because we know with certainty that + * the master is "master". so we remove any old mle from + * the list after setting it's master field, and then add + * the new migration mle. this way we can hold with the rule + * of having only one mle for a given lock name at all times. */ +static int dlm_add_migration_mle(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_master_list_entry *mle, + struct dlm_master_list_entry **oldmle, + const char *name, unsigned int namelen, + u8 new_master, u8 master) +{ + int found; + int ret = 0; + + *oldmle = NULL; + + mlog_entry_void(); + + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&dlm->master_lock); + + /* caller is responsible for any ref taken here on oldmle */ + found = dlm_find_mle(dlm, oldmle, (char *)name, namelen); + if (found) { + struct dlm_master_list_entry *tmp = *oldmle; + spin_lock(&tmp->spinlock); + if (tmp->type == DLM_MLE_MIGRATION) { + if (master == dlm->node_num) { + /* ah another process raced me to it */ + mlog(0, "tried to migrate %.*s, but some " + "process beat me to it\n", + namelen, name); + ret = -EEXIST; + } else { + /* bad. 2 NODES are trying to migrate! */ + mlog(ML_ERROR, "migration error mle: " + "master=%u new_master=%u // request: " + "master=%u new_master=%u // " + "lockres=%.*s\n", + tmp->master, tmp->new_master, + master, new_master, + namelen, name); + BUG(); + } + } else { + /* this is essentially what assert_master does */ + tmp->master = master; + atomic_set(&tmp->woken, 1); + wake_up(&tmp->wq); + /* remove it from the list so that only one + * mle will be found */ + list_del_init(&tmp->list); + } + spin_unlock(&tmp->spinlock); + } + + /* now add a migration mle to the tail of the list */ + dlm_init_mle(mle, DLM_MLE_MIGRATION, dlm, res, name, namelen); + mle->new_master = new_master; + mle->master = master; + /* do this for consistency with other mle types */ + set_bit(new_master, mle->maybe_map); + list_add(&mle->list, &dlm->master_list); + + return ret; +} + + +void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node) +{ + struct list_head *iter, *iter2; + struct dlm_master_list_entry *mle; + struct dlm_lock_resource *res; + + mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node); +top: + assert_spin_locked(&dlm->spinlock); + + /* clean the master list */ + spin_lock(&dlm->master_lock); + list_for_each_safe(iter, iter2, &dlm->master_list) { + mle = list_entry(iter, struct dlm_master_list_entry, list); + + BUG_ON(mle->type != DLM_MLE_BLOCK && + mle->type != DLM_MLE_MASTER && + mle->type != DLM_MLE_MIGRATION); + + /* MASTER mles are initiated locally. the waiting + * process will notice the node map change + * shortly. let that happen as normal. */ + if (mle->type == DLM_MLE_MASTER) + continue; + + + /* BLOCK mles are initiated by other nodes. + * need to clean up if the dead node would have + * been the master. */ + if (mle->type == DLM_MLE_BLOCK) { + int bit; + + spin_lock(&mle->spinlock); + bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0); + if (bit != dead_node) { + mlog(0, "mle found, but dead node %u would " + "not have been master\n", dead_node); + spin_unlock(&mle->spinlock); + } else { + /* must drop the refcount by one since the + * assert_master will never arrive. this + * may result in the mle being unlinked and + * freed, but there may still be a process + * waiting in the dlmlock path which is fine. */ + mlog(ML_ERROR, "node %u was expected master\n", + dead_node); + atomic_set(&mle->woken, 1); + spin_unlock(&mle->spinlock); + wake_up(&mle->wq); + /* final put will take care of list removal */ + __dlm_put_mle(mle); + } + continue; + } + + /* everything else is a MIGRATION mle */ + + /* the rule for MIGRATION mles is that the master + * becomes UNKNOWN if *either* the original or + * the new master dies. all UNKNOWN lockreses + * are sent to whichever node becomes the recovery + * master. the new master is responsible for + * determining if there is still a master for + * this lockres, or if he needs to take over + * mastery. either way, this node should expect + * another message to resolve this. */ + if (mle->master != dead_node && + mle->new_master != dead_node) + continue; + + /* if we have reached this point, this mle needs to + * be removed from the list and freed. */ + + /* remove from the list early. NOTE: unlinking + * list_head while in list_for_each_safe */ + spin_lock(&mle->spinlock); + list_del_init(&mle->list); + atomic_set(&mle->woken, 1); + spin_unlock(&mle->spinlock); + wake_up(&mle->wq); + + mlog(0, "node %u died during migration from " + "%u to %u!\n", dead_node, + mle->master, mle->new_master); + /* if there is a lockres associated with this + * mle, find it and set its owner to UNKNOWN */ + res = __dlm_lookup_lockres(dlm, mle->u.name.name, + mle->u.name.len); + if (res) { + /* unfortunately if we hit this rare case, our + * lock ordering is messed. we need to drop + * the master lock so that we can take the + * lockres lock, meaning that we will have to + * restart from the head of list. */ + spin_unlock(&dlm->master_lock); + + /* move lockres onto recovery list */ + spin_lock(&res->spinlock); + dlm_set_lockres_owner(dlm, res, + DLM_LOCK_RES_OWNER_UNKNOWN); + dlm_move_lockres_to_recovery_list(dlm, res); + spin_unlock(&res->spinlock); + dlm_lockres_put(res); + + /* dump the mle */ + spin_lock(&dlm->master_lock); + __dlm_put_mle(mle); + spin_unlock(&dlm->master_lock); + + /* restart */ + goto top; + } + + /* this may be the last reference */ + __dlm_put_mle(mle); + } + spin_unlock(&dlm->master_lock); +} + + +int dlm_finish_migration(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + u8 old_master) +{ + struct dlm_node_iter iter; + int ret = 0; + + spin_lock(&dlm->spinlock); + dlm_node_iter_init(dlm->domain_map, &iter); + clear_bit(old_master, iter.node_map); + clear_bit(dlm->node_num, iter.node_map); + spin_unlock(&dlm->spinlock); + + mlog(0, "now time to do a migrate request to other nodes\n"); + ret = dlm_do_migrate_request(dlm, res, old_master, + dlm->node_num, &iter); + if (ret < 0) { + mlog_errno(ret); + goto leave; + } + + mlog(0, "doing assert master of %.*s to all except the original node\n", + res->lockname.len, res->lockname.name); + /* this call now finishes out the nodemap + * even if one or more nodes die */ + ret = dlm_do_assert_master(dlm, res->lockname.name, + res->lockname.len, iter.node_map, + DLM_ASSERT_MASTER_FINISH_MIGRATION); + if (ret < 0) { + /* no longer need to retry. all living nodes contacted. */ + mlog_errno(ret); + ret = 0; + } + + memset(iter.node_map, 0, sizeof(iter.node_map)); + set_bit(old_master, iter.node_map); + mlog(0, "doing assert master of %.*s back to %u\n", + res->lockname.len, res->lockname.name, old_master); + ret = dlm_do_assert_master(dlm, res->lockname.name, + res->lockname.len, iter.node_map, + DLM_ASSERT_MASTER_FINISH_MIGRATION); + if (ret < 0) { + mlog(0, "assert master to original master failed " + "with %d.\n", ret); + /* the only nonzero status here would be because of + * a dead original node. we're done. */ + ret = 0; + } + + /* all done, set the owner, clear the flag */ + spin_lock(&res->spinlock); + dlm_set_lockres_owner(dlm, res, dlm->node_num); + res->state &= ~DLM_LOCK_RES_MIGRATING; + spin_unlock(&res->spinlock); + /* re-dirty it on the new master */ + dlm_kick_thread(dlm, res); + wake_up(&res->wq); +leave: + return ret; +} + +/* + * LOCKRES AST REFCOUNT + * this is integral to migration + */ + +/* for future intent to call an ast, reserve one ahead of time. + * this should be called only after waiting on the lockres + * with dlm_wait_on_lockres, and while still holding the + * spinlock after the call. */ +void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res) +{ + assert_spin_locked(&res->spinlock); + if (res->state & DLM_LOCK_RES_MIGRATING) { + __dlm_print_one_lock_resource(res); + } + BUG_ON(res->state & DLM_LOCK_RES_MIGRATING); + + atomic_inc(&res->asts_reserved); +} + +/* + * used to drop the reserved ast, either because it went unused, + * or because the ast/bast was actually called. + * + * also, if there is a pending migration on this lockres, + * and this was the last pending ast on the lockres, + * atomically set the MIGRATING flag before we drop the lock. + * this is how we ensure that migration can proceed with no + * asts in progress. note that it is ok if the state of the + * queues is such that a lock should be granted in the future + * or that a bast should be fired, because the new master will + * shuffle the lists on this lockres as soon as it is migrated. + */ +void dlm_lockres_release_ast(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + if (!atomic_dec_and_lock(&res->asts_reserved, &res->spinlock)) + return; + + if (!res->migration_pending) { + spin_unlock(&res->spinlock); + return; + } + + BUG_ON(res->state & DLM_LOCK_RES_MIGRATING); + res->migration_pending = 0; + res->state |= DLM_LOCK_RES_MIGRATING; + spin_unlock(&res->spinlock); + wake_up(&res->wq); + wake_up(&dlm->migration_wq); +} diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c new file mode 100644 index 0000000..0c8eb10 --- /dev/null +++ b/fs/ocfs2/dlm/dlmrecovery.c @@ -0,0 +1,2132 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmrecovery.c + * + * recovery stuff + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/timer.h> +#include <linux/kthread.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" +#include "dlmdomain.h" + +#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY) +#include "cluster/masklog.h" + +static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node); + +static int dlm_recovery_thread(void *data); +void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); +int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); +static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm); +static int dlm_do_recovery(struct dlm_ctxt *dlm); + +static int dlm_pick_recovery_master(struct dlm_ctxt *dlm); +static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node); +static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); +static int dlm_request_all_locks(struct dlm_ctxt *dlm, + u8 request_from, u8 dead_node); +static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); + +static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res); +static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, + const char *lockname, int namelen, + int total_locks, u64 cookie, + u8 flags, u8 master); +static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, + struct dlm_migratable_lockres *mres, + u8 send_to, + struct dlm_lock_resource *res, + int total_locks); +static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 *real_master); +static int dlm_process_recovery_data(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_migratable_lockres *mres); +static int dlm_do_master_requery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 nodenum, u8 *real_master); +static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm); +static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, + u8 dead_node, u8 send_to); +static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node); +static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, + struct list_head *list, u8 dead_node); +static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, + u8 dead_node, u8 new_master); +static void dlm_reco_ast(void *astdata); +static void dlm_reco_bast(void *astdata, int blocked_type); +static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st); +static void dlm_request_all_locks_worker(struct dlm_work_item *item, + void *data); +static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data); + +static u64 dlm_get_next_mig_cookie(void); + +static spinlock_t dlm_reco_state_lock = SPIN_LOCK_UNLOCKED; +static spinlock_t dlm_mig_cookie_lock = SPIN_LOCK_UNLOCKED; +static u64 dlm_mig_cookie = 1; + +static u64 dlm_get_next_mig_cookie(void) +{ + u64 c; + spin_lock(&dlm_mig_cookie_lock); + c = dlm_mig_cookie; + if (dlm_mig_cookie == (~0ULL)) + dlm_mig_cookie = 1; + else + dlm_mig_cookie++; + spin_unlock(&dlm_mig_cookie_lock); + return c; +} + +static inline void dlm_reset_recovery(struct dlm_ctxt *dlm) +{ + spin_lock(&dlm->spinlock); + clear_bit(dlm->reco.dead_node, dlm->recovery_map); + dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; + dlm->reco.new_master = O2NM_INVALID_NODE_NUM; + spin_unlock(&dlm->spinlock); +} + +/* Worker function used during recovery. */ +void dlm_dispatch_work(void *data) +{ + struct dlm_ctxt *dlm = (struct dlm_ctxt *)data; + LIST_HEAD(tmp_list); + struct list_head *iter, *iter2; + struct dlm_work_item *item; + dlm_workfunc_t *workfunc; + + spin_lock(&dlm->work_lock); + list_splice_init(&dlm->work_list, &tmp_list); + spin_unlock(&dlm->work_lock); + + list_for_each_safe(iter, iter2, &tmp_list) { + item = list_entry(iter, struct dlm_work_item, list); + workfunc = item->func; + list_del_init(&item->list); + + /* already have ref on dlm to avoid having + * it disappear. just double-check. */ + BUG_ON(item->dlm != dlm); + + /* this is allowed to sleep and + * call network stuff */ + workfunc(item, item->data); + + dlm_put(dlm); + kfree(item); + } +} + +/* + * RECOVERY THREAD + */ + +static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm) +{ + /* wake the recovery thread + * this will wake the reco thread in one of three places + * 1) sleeping with no recovery happening + * 2) sleeping with recovery mastered elsewhere + * 3) recovery mastered here, waiting on reco data */ + + wake_up(&dlm->dlm_reco_thread_wq); +} + +/* Launch the recovery thread */ +int dlm_launch_recovery_thread(struct dlm_ctxt *dlm) +{ + mlog(0, "starting dlm recovery thread...\n"); + + dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm, + "dlm_reco_thread"); + if (IS_ERR(dlm->dlm_reco_thread_task)) { + mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task)); + dlm->dlm_reco_thread_task = NULL; + return -EINVAL; + } + + return 0; +} + +void dlm_complete_recovery_thread(struct dlm_ctxt *dlm) +{ + if (dlm->dlm_reco_thread_task) { + mlog(0, "waiting for dlm recovery thread to exit\n"); + kthread_stop(dlm->dlm_reco_thread_task); + dlm->dlm_reco_thread_task = NULL; + } +} + + + +/* + * this is lame, but here's how recovery works... + * 1) all recovery threads cluster wide will work on recovering + * ONE node at a time + * 2) negotiate who will take over all the locks for the dead node. + * thats right... ALL the locks. + * 3) once a new master is chosen, everyone scans all locks + * and moves aside those mastered by the dead guy + * 4) each of these locks should be locked until recovery is done + * 5) the new master collects up all of secondary lock queue info + * one lock at a time, forcing each node to communicate back + * before continuing + * 6) each secondary lock queue responds with the full known lock info + * 7) once the new master has run all its locks, it sends a ALLDONE! + * message to everyone + * 8) upon receiving this message, the secondary queue node unlocks + * and responds to the ALLDONE + * 9) once the new master gets responses from everyone, he unlocks + * everything and recovery for this dead node is done + *10) go back to 2) while there are still dead nodes + * + */ + + +#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000) + +static int dlm_recovery_thread(void *data) +{ + int status; + struct dlm_ctxt *dlm = data; + unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS); + + mlog(0, "dlm thread running for %s...\n", dlm->name); + + while (!kthread_should_stop()) { + if (dlm_joined(dlm)) { + status = dlm_do_recovery(dlm); + if (status == -EAGAIN) { + /* do not sleep, recheck immediately. */ + continue; + } + if (status < 0) + mlog_errno(status); + } + + wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, + kthread_should_stop(), + timeout); + } + + mlog(0, "quitting DLM recovery thread\n"); + return 0; +} + +/* callers of the top-level api calls (dlmlock/dlmunlock) should + * block on the dlm->reco.event when recovery is in progress. + * the dlm recovery thread will set this state when it begins + * recovering a dead node (as the new master or not) and clear + * the state and wake as soon as all affected lock resources have + * been marked with the RECOVERY flag */ +static int dlm_in_recovery(struct dlm_ctxt *dlm) +{ + int in_recovery; + spin_lock(&dlm->spinlock); + in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE); + spin_unlock(&dlm->spinlock); + return in_recovery; +} + + +void dlm_wait_for_recovery(struct dlm_ctxt *dlm) +{ + wait_event(dlm->reco.event, !dlm_in_recovery(dlm)); +} + +static void dlm_begin_recovery(struct dlm_ctxt *dlm) +{ + spin_lock(&dlm->spinlock); + BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE); + dlm->reco.state |= DLM_RECO_STATE_ACTIVE; + spin_unlock(&dlm->spinlock); +} + +static void dlm_end_recovery(struct dlm_ctxt *dlm) +{ + spin_lock(&dlm->spinlock); + BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE)); + dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE; + spin_unlock(&dlm->spinlock); + wake_up(&dlm->reco.event); +} + +static int dlm_do_recovery(struct dlm_ctxt *dlm) +{ + int status = 0; + + spin_lock(&dlm->spinlock); + + /* check to see if the new master has died */ + if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM && + test_bit(dlm->reco.new_master, dlm->recovery_map)) { + mlog(0, "new master %u died while recovering %u!\n", + dlm->reco.new_master, dlm->reco.dead_node); + /* unset the new_master, leave dead_node */ + dlm->reco.new_master = O2NM_INVALID_NODE_NUM; + } + + /* select a target to recover */ + if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { + int bit; + + bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0); + if (bit >= O2NM_MAX_NODES || bit < 0) + dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; + else + dlm->reco.dead_node = bit; + } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) { + /* BUG? */ + mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n", + dlm->reco.dead_node); + dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; + } + + if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { + // mlog(0, "nothing to recover! sleeping now!\n"); + spin_unlock(&dlm->spinlock); + /* return to main thread loop and sleep. */ + return 0; + } + mlog(0, "recovery thread found node %u in the recovery map!\n", + dlm->reco.dead_node); + spin_unlock(&dlm->spinlock); + + /* take write barrier */ + /* (stops the list reshuffling thread, proxy ast handling) */ + dlm_begin_recovery(dlm); + + if (dlm->reco.new_master == dlm->node_num) + goto master_here; + + if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) { + /* choose a new master */ + if (!dlm_pick_recovery_master(dlm)) { + /* already notified everyone. go. */ + dlm->reco.new_master = dlm->node_num; + goto master_here; + } + mlog(0, "another node will master this recovery session.\n"); + } + mlog(0, "dlm=%s, new_master=%u, this node=%u, dead_node=%u\n", + dlm->name, dlm->reco.new_master, + dlm->node_num, dlm->reco.dead_node); + + /* it is safe to start everything back up here + * because all of the dead node's lock resources + * have been marked as in-recovery */ + dlm_end_recovery(dlm); + + /* sleep out in main dlm_recovery_thread loop. */ + return 0; + +master_here: + mlog(0, "mastering recovery of %s:%u here(this=%u)!\n", + dlm->name, dlm->reco.dead_node, dlm->node_num); + + status = dlm_remaster_locks(dlm, dlm->reco.dead_node); + if (status < 0) { + mlog(ML_ERROR, "error %d remastering locks for node %u, " + "retrying.\n", status, dlm->reco.dead_node); + } else { + /* success! see if any other nodes need recovery */ + dlm_reset_recovery(dlm); + } + dlm_end_recovery(dlm); + + /* continue and look for another dead node */ + return -EAGAIN; +} + +static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node) +{ + int status = 0; + struct dlm_reco_node_data *ndata; + struct list_head *iter; + int all_nodes_done; + int destroy = 0; + int pass = 0; + + status = dlm_init_recovery_area(dlm, dead_node); + if (status < 0) + goto leave; + + /* safe to access the node data list without a lock, since this + * process is the only one to change the list */ + list_for_each(iter, &dlm->reco.node_data) { + ndata = list_entry (iter, struct dlm_reco_node_data, list); + BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT); + ndata->state = DLM_RECO_NODE_DATA_REQUESTING; + + mlog(0, "requesting lock info from node %u\n", + ndata->node_num); + + if (ndata->node_num == dlm->node_num) { + ndata->state = DLM_RECO_NODE_DATA_DONE; + continue; + } + + status = dlm_request_all_locks(dlm, ndata->node_num, dead_node); + if (status < 0) { + mlog_errno(status); + if (dlm_is_host_down(status)) + ndata->state = DLM_RECO_NODE_DATA_DEAD; + else { + destroy = 1; + goto leave; + } + } + + switch (ndata->state) { + case DLM_RECO_NODE_DATA_INIT: + case DLM_RECO_NODE_DATA_FINALIZE_SENT: + case DLM_RECO_NODE_DATA_REQUESTED: + BUG(); + break; + case DLM_RECO_NODE_DATA_DEAD: + mlog(0, "node %u died after requesting " + "recovery info for node %u\n", + ndata->node_num, dead_node); + // start all over + destroy = 1; + status = -EAGAIN; + goto leave; + case DLM_RECO_NODE_DATA_REQUESTING: + ndata->state = DLM_RECO_NODE_DATA_REQUESTED; + mlog(0, "now receiving recovery data from " + "node %u for dead node %u\n", + ndata->node_num, dead_node); + break; + case DLM_RECO_NODE_DATA_RECEIVING: + mlog(0, "already receiving recovery data from " + "node %u for dead node %u\n", + ndata->node_num, dead_node); + break; + case DLM_RECO_NODE_DATA_DONE: + mlog(0, "already DONE receiving recovery data " + "from node %u for dead node %u\n", + ndata->node_num, dead_node); + break; + } + } + + mlog(0, "done requesting all lock info\n"); + + /* nodes should be sending reco data now + * just need to wait */ + + while (1) { + /* check all the nodes now to see if we are + * done, or if anyone died */ + all_nodes_done = 1; + spin_lock(&dlm_reco_state_lock); + list_for_each(iter, &dlm->reco.node_data) { + ndata = list_entry (iter, struct dlm_reco_node_data, list); + + mlog(0, "checking recovery state of node %u\n", + ndata->node_num); + switch (ndata->state) { + case DLM_RECO_NODE_DATA_INIT: + case DLM_RECO_NODE_DATA_REQUESTING: + mlog(ML_ERROR, "bad ndata state for " + "node %u: state=%d\n", + ndata->node_num, ndata->state); + BUG(); + break; + case DLM_RECO_NODE_DATA_DEAD: + mlog(0, "node %u died after " + "requesting recovery info for " + "node %u\n", ndata->node_num, + dead_node); + spin_unlock(&dlm_reco_state_lock); + // start all over + destroy = 1; + status = -EAGAIN; + goto leave; + case DLM_RECO_NODE_DATA_RECEIVING: + case DLM_RECO_NODE_DATA_REQUESTED: + all_nodes_done = 0; + break; + case DLM_RECO_NODE_DATA_DONE: + break; + case DLM_RECO_NODE_DATA_FINALIZE_SENT: + break; + } + } + spin_unlock(&dlm_reco_state_lock); + + mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass, + all_nodes_done?"yes":"no"); + if (all_nodes_done) { + int ret; + + /* all nodes are now in DLM_RECO_NODE_DATA_DONE state + * just send a finalize message to everyone and + * clean up */ + mlog(0, "all nodes are done! send finalize\n"); + ret = dlm_send_finalize_reco_message(dlm); + if (ret < 0) + mlog_errno(ret); + + spin_lock(&dlm->spinlock); + dlm_finish_local_lockres_recovery(dlm, dead_node, + dlm->node_num); + spin_unlock(&dlm->spinlock); + mlog(0, "should be done with recovery!\n"); + + mlog(0, "finishing recovery of %s at %lu, " + "dead=%u, this=%u, new=%u\n", dlm->name, + jiffies, dlm->reco.dead_node, + dlm->node_num, dlm->reco.new_master); + destroy = 1; + status = ret; + /* rescan everything marked dirty along the way */ + dlm_kick_thread(dlm, NULL); + break; + } + /* wait to be signalled, with periodic timeout + * to check for node death */ + wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, + kthread_should_stop(), + msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS)); + + } + +leave: + if (destroy) + dlm_destroy_recovery_area(dlm, dead_node); + + mlog_exit(status); + return status; +} + +static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) +{ + int num=0; + struct dlm_reco_node_data *ndata; + + spin_lock(&dlm->spinlock); + memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map)); + /* nodes can only be removed (by dying) after dropping + * this lock, and death will be trapped later, so this should do */ + spin_unlock(&dlm->spinlock); + + while (1) { + num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num); + if (num >= O2NM_MAX_NODES) { + break; + } + BUG_ON(num == dead_node); + + ndata = kcalloc(1, sizeof(*ndata), GFP_KERNEL); + if (!ndata) { + dlm_destroy_recovery_area(dlm, dead_node); + return -ENOMEM; + } + ndata->node_num = num; + ndata->state = DLM_RECO_NODE_DATA_INIT; + spin_lock(&dlm_reco_state_lock); + list_add_tail(&ndata->list, &dlm->reco.node_data); + spin_unlock(&dlm_reco_state_lock); + num++; + } + + return 0; +} + +static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) +{ + struct list_head *iter, *iter2; + struct dlm_reco_node_data *ndata; + LIST_HEAD(tmplist); + + spin_lock(&dlm_reco_state_lock); + list_splice_init(&dlm->reco.node_data, &tmplist); + spin_unlock(&dlm_reco_state_lock); + + list_for_each_safe(iter, iter2, &tmplist) { + ndata = list_entry (iter, struct dlm_reco_node_data, list); + list_del_init(&ndata->list); + kfree(ndata); + } +} + +static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from, + u8 dead_node) +{ + struct dlm_lock_request lr; + enum dlm_status ret; + + mlog(0, "\n"); + + + mlog(0, "dlm_request_all_locks: dead node is %u, sending request " + "to %u\n", dead_node, request_from); + + memset(&lr, 0, sizeof(lr)); + lr.node_idx = dlm->node_num; + lr.dead_node = dead_node; + + // send message + ret = DLM_NOLOCKMGR; + ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key, + &lr, sizeof(lr), request_from, NULL); + + /* negative status is handled by caller */ + if (ret < 0) + mlog_errno(ret); + + // return from here, then + // sleep until all received or error + return ret; + +} + +int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf; + char *buf = NULL; + struct dlm_work_item *item = NULL; + + if (!dlm_grab(dlm)) + return -EINVAL; + + BUG_ON(lr->dead_node != dlm->reco.dead_node); + + item = kcalloc(1, sizeof(*item), GFP_KERNEL); + if (!item) { + dlm_put(dlm); + return -ENOMEM; + } + + /* this will get freed by dlm_request_all_locks_worker */ + buf = (char *) __get_free_page(GFP_KERNEL); + if (!buf) { + kfree(item); + dlm_put(dlm); + return -ENOMEM; + } + + /* queue up work for dlm_request_all_locks_worker */ + dlm_grab(dlm); /* get an extra ref for the work item */ + dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf); + item->u.ral.reco_master = lr->node_idx; + item->u.ral.dead_node = lr->dead_node; + spin_lock(&dlm->work_lock); + list_add_tail(&item->list, &dlm->work_list); + spin_unlock(&dlm->work_lock); + schedule_work(&dlm->dispatched_work); + + dlm_put(dlm); + return 0; +} + +static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data) +{ + struct dlm_migratable_lockres *mres; + struct dlm_lock_resource *res; + struct dlm_ctxt *dlm; + LIST_HEAD(resources); + struct list_head *iter; + int ret; + u8 dead_node, reco_master; + + dlm = item->dlm; + dead_node = item->u.ral.dead_node; + reco_master = item->u.ral.reco_master; + BUG_ON(dead_node != dlm->reco.dead_node); + BUG_ON(reco_master != dlm->reco.new_master); + + mres = (struct dlm_migratable_lockres *)data; + + /* lock resources should have already been moved to the + * dlm->reco.resources list. now move items from that list + * to a temp list if the dead owner matches. note that the + * whole cluster recovers only one node at a time, so we + * can safely move UNKNOWN lock resources for each recovery + * session. */ + dlm_move_reco_locks_to_list(dlm, &resources, dead_node); + + /* now we can begin blasting lockreses without the dlm lock */ + list_for_each(iter, &resources) { + res = list_entry (iter, struct dlm_lock_resource, recovering); + ret = dlm_send_one_lockres(dlm, res, mres, reco_master, + DLM_MRES_RECOVERY); + if (ret < 0) + mlog_errno(ret); + } + + /* move the resources back to the list */ + spin_lock(&dlm->spinlock); + list_splice_init(&resources, &dlm->reco.resources); + spin_unlock(&dlm->spinlock); + + ret = dlm_send_all_done_msg(dlm, dead_node, reco_master); + if (ret < 0) + mlog_errno(ret); + + free_page((unsigned long)data); +} + + +static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to) +{ + int ret, tmpret; + struct dlm_reco_data_done done_msg; + + memset(&done_msg, 0, sizeof(done_msg)); + done_msg.node_idx = dlm->node_num; + done_msg.dead_node = dead_node; + mlog(0, "sending DATA DONE message to %u, " + "my node=%u, dead node=%u\n", send_to, done_msg.node_idx, + done_msg.dead_node); + + ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg, + sizeof(done_msg), send_to, &tmpret); + /* negative status is ignored by the caller */ + if (ret >= 0) + ret = tmpret; + return ret; +} + + +int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf; + struct list_head *iter; + struct dlm_reco_node_data *ndata = NULL; + int ret = -EINVAL; + + if (!dlm_grab(dlm)) + return -EINVAL; + + mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, " + "node_idx=%u, this node=%u\n", done->dead_node, + dlm->reco.dead_node, done->node_idx, dlm->node_num); + BUG_ON(done->dead_node != dlm->reco.dead_node); + + spin_lock(&dlm_reco_state_lock); + list_for_each(iter, &dlm->reco.node_data) { + ndata = list_entry (iter, struct dlm_reco_node_data, list); + if (ndata->node_num != done->node_idx) + continue; + + switch (ndata->state) { + case DLM_RECO_NODE_DATA_INIT: + case DLM_RECO_NODE_DATA_DEAD: + case DLM_RECO_NODE_DATA_DONE: + case DLM_RECO_NODE_DATA_FINALIZE_SENT: + mlog(ML_ERROR, "bad ndata state for node %u:" + " state=%d\n", ndata->node_num, + ndata->state); + BUG(); + break; + case DLM_RECO_NODE_DATA_RECEIVING: + case DLM_RECO_NODE_DATA_REQUESTED: + case DLM_RECO_NODE_DATA_REQUESTING: + mlog(0, "node %u is DONE sending " + "recovery data!\n", + ndata->node_num); + + ndata->state = DLM_RECO_NODE_DATA_DONE; + ret = 0; + break; + } + } + spin_unlock(&dlm_reco_state_lock); + + /* wake the recovery thread, some node is done */ + if (!ret) + dlm_kick_recovery_thread(dlm); + + if (ret < 0) + mlog(ML_ERROR, "failed to find recovery node data for node " + "%u\n", done->node_idx); + dlm_put(dlm); + + mlog(0, "leaving reco data done handler, ret=%d\n", ret); + return ret; +} + +static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, + struct list_head *list, + u8 dead_node) +{ + struct dlm_lock_resource *res; + struct list_head *iter, *iter2; + + spin_lock(&dlm->spinlock); + list_for_each_safe(iter, iter2, &dlm->reco.resources) { + res = list_entry (iter, struct dlm_lock_resource, recovering); + if (dlm_is_recovery_lock(res->lockname.name, + res->lockname.len)) + continue; + if (res->owner == dead_node) { + mlog(0, "found lockres owned by dead node while " + "doing recovery for node %u. sending it.\n", + dead_node); + list_del_init(&res->recovering); + list_add_tail(&res->recovering, list); + } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "found UNKNOWN owner while doing recovery " + "for node %u. sending it.\n", dead_node); + list_del_init(&res->recovering); + list_add_tail(&res->recovering, list); + } + } + spin_unlock(&dlm->spinlock); +} + +static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res) +{ + int total_locks = 0; + struct list_head *iter, *queue = &res->granted; + int i; + + for (i=0; i<3; i++) { + list_for_each(iter, queue) + total_locks++; + queue++; + } + return total_locks; +} + + +static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, + struct dlm_migratable_lockres *mres, + u8 send_to, + struct dlm_lock_resource *res, + int total_locks) +{ + u64 mig_cookie = be64_to_cpu(mres->mig_cookie); + int mres_total_locks = be32_to_cpu(mres->total_locks); + int sz, ret = 0, status = 0; + u8 orig_flags = mres->flags, + orig_master = mres->master; + + BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS); + if (!mres->num_locks) + return 0; + + sz = sizeof(struct dlm_migratable_lockres) + + (mres->num_locks * sizeof(struct dlm_migratable_lock)); + + /* add an all-done flag if we reached the last lock */ + orig_flags = mres->flags; + BUG_ON(total_locks > mres_total_locks); + if (total_locks == mres_total_locks) + mres->flags |= DLM_MRES_ALL_DONE; + + /* send it */ + ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres, + sz, send_to, &status); + if (ret < 0) { + /* XXX: negative status is not handled. + * this will end up killing this node. */ + mlog_errno(ret); + } else { + /* might get an -ENOMEM back here */ + ret = status; + if (ret < 0) { + mlog_errno(ret); + + if (ret == -EFAULT) { + mlog(ML_ERROR, "node %u told me to kill " + "myself!\n", send_to); + BUG(); + } + } + } + + /* zero and reinit the message buffer */ + dlm_init_migratable_lockres(mres, res->lockname.name, + res->lockname.len, mres_total_locks, + mig_cookie, orig_flags, orig_master); + return ret; +} + +static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, + const char *lockname, int namelen, + int total_locks, u64 cookie, + u8 flags, u8 master) +{ + /* mres here is one full page */ + memset(mres, 0, PAGE_SIZE); + mres->lockname_len = namelen; + memcpy(mres->lockname, lockname, namelen); + mres->num_locks = 0; + mres->total_locks = cpu_to_be32(total_locks); + mres->mig_cookie = cpu_to_be64(cookie); + mres->flags = flags; + mres->master = master; +} + + +/* returns 1 if this lock fills the network structure, + * 0 otherwise */ +static int dlm_add_lock_to_array(struct dlm_lock *lock, + struct dlm_migratable_lockres *mres, int queue) +{ + struct dlm_migratable_lock *ml; + int lock_num = mres->num_locks; + + ml = &(mres->ml[lock_num]); + ml->cookie = lock->ml.cookie; + ml->type = lock->ml.type; + ml->convert_type = lock->ml.convert_type; + ml->highest_blocked = lock->ml.highest_blocked; + ml->list = queue; + if (lock->lksb) { + ml->flags = lock->lksb->flags; + /* send our current lvb */ + if (ml->type == LKM_EXMODE || + ml->type == LKM_PRMODE) { + /* if it is already set, this had better be a PR + * and it has to match */ + if (mres->lvb[0] && (ml->type == LKM_EXMODE || + memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) { + mlog(ML_ERROR, "mismatched lvbs!\n"); + __dlm_print_one_lock_resource(lock->lockres); + BUG(); + } + memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN); + } + } + ml->node = lock->ml.node; + mres->num_locks++; + /* we reached the max, send this network message */ + if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS) + return 1; + return 0; +} + + +int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, + struct dlm_migratable_lockres *mres, + u8 send_to, u8 flags) +{ + struct list_head *queue, *iter; + int total_locks, i; + u64 mig_cookie = 0; + struct dlm_lock *lock; + int ret = 0; + + BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); + + mlog(0, "sending to %u\n", send_to); + + total_locks = dlm_num_locks_in_lockres(res); + if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) { + /* rare, but possible */ + mlog(0, "argh. lockres has %d locks. this will " + "require more than one network packet to " + "migrate\n", total_locks); + mig_cookie = dlm_get_next_mig_cookie(); + } + + dlm_init_migratable_lockres(mres, res->lockname.name, + res->lockname.len, total_locks, + mig_cookie, flags, res->owner); + + total_locks = 0; + for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) { + queue = dlm_list_idx_to_ptr(res, i); + list_for_each(iter, queue) { + lock = list_entry (iter, struct dlm_lock, list); + + /* add another lock. */ + total_locks++; + if (!dlm_add_lock_to_array(lock, mres, i)) + continue; + + /* this filled the lock message, + * we must send it immediately. */ + ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, + res, total_locks); + if (ret < 0) { + // TODO + mlog(ML_ERROR, "dlm_send_mig_lockres_msg " + "returned %d, TODO\n", ret); + BUG(); + } + } + } + /* flush any remaining locks */ + ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks); + if (ret < 0) { + // TODO + mlog(ML_ERROR, "dlm_send_mig_lockres_msg returned %d, " + "TODO\n", ret); + BUG(); + } + return ret; +} + + + +/* + * this message will contain no more than one page worth of + * recovery data, and it will work on only one lockres. + * there may be many locks in this page, and we may need to wait + * for additional packets to complete all the locks (rare, but + * possible). + */ +/* + * NOTE: the allocation error cases here are scary + * we really cannot afford to fail an alloc in recovery + * do we spin? returning an error only delays the problem really + */ + +int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_migratable_lockres *mres = + (struct dlm_migratable_lockres *)msg->buf; + int ret = 0; + u8 real_master; + char *buf = NULL; + struct dlm_work_item *item = NULL; + struct dlm_lock_resource *res = NULL; + + if (!dlm_grab(dlm)) + return -EINVAL; + + BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); + + real_master = mres->master; + if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { + /* cannot migrate a lockres with no master */ + BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); + } + + mlog(0, "%s message received from node %u\n", + (mres->flags & DLM_MRES_RECOVERY) ? + "recovery" : "migration", mres->master); + if (mres->flags & DLM_MRES_ALL_DONE) + mlog(0, "all done flag. all lockres data received!\n"); + + ret = -ENOMEM; + buf = kmalloc(be16_to_cpu(msg->data_len), GFP_KERNEL); + item = kcalloc(1, sizeof(*item), GFP_KERNEL); + if (!buf || !item) + goto leave; + + /* lookup the lock to see if we have a secondary queue for this + * already... just add the locks in and this will have its owner + * and RECOVERY flag changed when it completes. */ + res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len); + if (res) { + /* this will get a ref on res */ + /* mark it as recovering/migrating and hash it */ + spin_lock(&res->spinlock); + if (mres->flags & DLM_MRES_RECOVERY) { + res->state |= DLM_LOCK_RES_RECOVERING; + } else { + if (res->state & DLM_LOCK_RES_MIGRATING) { + /* this is at least the second + * lockres message */ + mlog(0, "lock %.*s is already migrating\n", + mres->lockname_len, + mres->lockname); + } else if (res->state & DLM_LOCK_RES_RECOVERING) { + /* caller should BUG */ + mlog(ML_ERROR, "node is attempting to migrate " + "lock %.*s, but marked as recovering!\n", + mres->lockname_len, mres->lockname); + ret = -EFAULT; + spin_unlock(&res->spinlock); + goto leave; + } + res->state |= DLM_LOCK_RES_MIGRATING; + } + spin_unlock(&res->spinlock); + } else { + /* need to allocate, just like if it was + * mastered here normally */ + res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len); + if (!res) + goto leave; + + /* to match the ref that we would have gotten if + * dlm_lookup_lockres had succeeded */ + dlm_lockres_get(res); + + /* mark it as recovering/migrating and hash it */ + if (mres->flags & DLM_MRES_RECOVERY) + res->state |= DLM_LOCK_RES_RECOVERING; + else + res->state |= DLM_LOCK_RES_MIGRATING; + + spin_lock(&dlm->spinlock); + __dlm_insert_lockres(dlm, res); + spin_unlock(&dlm->spinlock); + + /* now that the new lockres is inserted, + * make it usable by other processes */ + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + spin_unlock(&res->spinlock); + + /* add an extra ref for just-allocated lockres + * otherwise the lockres will be purged immediately */ + dlm_lockres_get(res); + + } + + /* at this point we have allocated everything we need, + * and we have a hashed lockres with an extra ref and + * the proper res->state flags. */ + ret = 0; + if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) { + /* migration cannot have an unknown master */ + BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); + mlog(0, "recovery has passed me a lockres with an " + "unknown owner.. will need to requery: " + "%.*s\n", mres->lockname_len, mres->lockname); + } else { + spin_lock(&res->spinlock); + dlm_change_lockres_owner(dlm, res, dlm->node_num); + spin_unlock(&res->spinlock); + } + + /* queue up work for dlm_mig_lockres_worker */ + dlm_grab(dlm); /* get an extra ref for the work item */ + memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */ + dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf); + item->u.ml.lockres = res; /* already have a ref */ + item->u.ml.real_master = real_master; + spin_lock(&dlm->work_lock); + list_add_tail(&item->list, &dlm->work_list); + spin_unlock(&dlm->work_lock); + schedule_work(&dlm->dispatched_work); + +leave: + dlm_put(dlm); + if (ret < 0) { + if (buf) + kfree(buf); + if (item) + kfree(item); + } + + mlog_exit(ret); + return ret; +} + + +static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_migratable_lockres *mres; + int ret = 0; + struct dlm_lock_resource *res; + u8 real_master; + + dlm = item->dlm; + mres = (struct dlm_migratable_lockres *)data; + + res = item->u.ml.lockres; + real_master = item->u.ml.real_master; + + if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { + /* this case is super-rare. only occurs if + * node death happens during migration. */ +again: + ret = dlm_lockres_master_requery(dlm, res, &real_master); + if (ret < 0) { + mlog(0, "dlm_lockres_master_requery failure: %d\n", + ret); + goto again; + } + if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "lockres %.*s not claimed. " + "this node will take it.\n", + res->lockname.len, res->lockname.name); + } else { + mlog(0, "master needs to respond to sender " + "that node %u still owns %.*s\n", + real_master, res->lockname.len, + res->lockname.name); + /* cannot touch this lockres */ + goto leave; + } + } + + ret = dlm_process_recovery_data(dlm, res, mres); + if (ret < 0) + mlog(0, "dlm_process_recovery_data returned %d\n", ret); + else + mlog(0, "dlm_process_recovery_data succeeded\n"); + + if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) == + (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) { + ret = dlm_finish_migration(dlm, res, mres->master); + if (ret < 0) + mlog_errno(ret); + } + +leave: + kfree(data); + mlog_exit(ret); +} + + + +static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 *real_master) +{ + struct dlm_node_iter iter; + int nodenum; + int ret = 0; + + *real_master = DLM_LOCK_RES_OWNER_UNKNOWN; + + /* we only reach here if one of the two nodes in a + * migration died while the migration was in progress. + * at this point we need to requery the master. we + * know that the new_master got as far as creating + * an mle on at least one node, but we do not know + * if any nodes had actually cleared the mle and set + * the master to the new_master. the old master + * is supposed to set the owner to UNKNOWN in the + * event of a new_master death, so the only possible + * responses that we can get from nodes here are + * that the master is new_master, or that the master + * is UNKNOWN. + * if all nodes come back with UNKNOWN then we know + * the lock needs remastering here. + * if any node comes back with a valid master, check + * to see if that master is the one that we are + * recovering. if so, then the new_master died and + * we need to remaster this lock. if not, then the + * new_master survived and that node will respond to + * other nodes about the owner. + * if there is an owner, this node needs to dump this + * lockres and alert the sender that this lockres + * was rejected. */ + spin_lock(&dlm->spinlock); + dlm_node_iter_init(dlm->domain_map, &iter); + spin_unlock(&dlm->spinlock); + + while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { + /* do not send to self */ + if (nodenum == dlm->node_num) + continue; + ret = dlm_do_master_requery(dlm, res, nodenum, real_master); + if (ret < 0) { + mlog_errno(ret); + BUG(); + /* TODO: need to figure a way to restart this */ + } + if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "lock master is %u\n", *real_master); + break; + } + } + return ret; +} + + +static int dlm_do_master_requery(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + u8 nodenum, u8 *real_master) +{ + int ret = -EINVAL; + struct dlm_master_requery req; + int status = DLM_LOCK_RES_OWNER_UNKNOWN; + + memset(&req, 0, sizeof(req)); + req.node_idx = dlm->node_num; + req.namelen = res->lockname.len; + memcpy(req.name, res->lockname.name, res->lockname.len); + + ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key, + &req, sizeof(req), nodenum, &status); + /* XXX: negative status not handled properly here. */ + if (ret < 0) + mlog_errno(ret); + else { + BUG_ON(status < 0); + BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN); + *real_master = (u8) (status & 0xff); + mlog(0, "node %u responded to master requery with %u\n", + nodenum, *real_master); + ret = 0; + } + return ret; +} + + +/* this function cannot error, so unless the sending + * or receiving of the message failed, the owner can + * be trusted */ +int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf; + struct dlm_lock_resource *res = NULL; + int master = DLM_LOCK_RES_OWNER_UNKNOWN; + u32 flags = DLM_ASSERT_MASTER_REQUERY; + + if (!dlm_grab(dlm)) { + /* since the domain has gone away on this + * node, the proper response is UNKNOWN */ + return master; + } + + spin_lock(&dlm->spinlock); + res = __dlm_lookup_lockres(dlm, req->name, req->namelen); + if (res) { + spin_lock(&res->spinlock); + master = res->owner; + if (master == dlm->node_num) { + int ret = dlm_dispatch_assert_master(dlm, res, + 0, 0, flags); + if (ret < 0) { + mlog_errno(-ENOMEM); + /* retry!? */ + BUG(); + } + } + spin_unlock(&res->spinlock); + } + spin_unlock(&dlm->spinlock); + + dlm_put(dlm); + return master; +} + +static inline struct list_head * +dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num) +{ + struct list_head *ret; + BUG_ON(list_num < 0); + BUG_ON(list_num > 2); + ret = &(res->granted); + ret += list_num; + return ret; +} +/* TODO: do ast flush business + * TODO: do MIGRATING and RECOVERING spinning + */ + +/* +* NOTE about in-flight requests during migration: +* +* Before attempting the migrate, the master has marked the lockres as +* MIGRATING and then flushed all of its pending ASTS. So any in-flight +* requests either got queued before the MIGRATING flag got set, in which +* case the lock data will reflect the change and a return message is on +* the way, or the request failed to get in before MIGRATING got set. In +* this case, the caller will be told to spin and wait for the MIGRATING +* flag to be dropped, then recheck the master. +* This holds true for the convert, cancel and unlock cases, and since lvb +* updates are tied to these same messages, it applies to lvb updates as +* well. For the lock case, there is no way a lock can be on the master +* queue and not be on the secondary queue since the lock is always added +* locally first. This means that the new target node will never be sent +* a lock that he doesn't already have on the list. +* In total, this means that the local lock is correct and should not be +* updated to match the one sent by the master. Any messages sent back +* from the master before the MIGRATING flag will bring the lock properly +* up-to-date, and the change will be ordered properly for the waiter. +* We will *not* attempt to modify the lock underneath the waiter. +*/ + +static int dlm_process_recovery_data(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_migratable_lockres *mres) +{ + struct dlm_migratable_lock *ml; + struct list_head *queue; + struct dlm_lock *newlock = NULL; + struct dlm_lockstatus *lksb = NULL; + int ret = 0; + int i; + struct list_head *iter; + struct dlm_lock *lock = NULL; + + mlog(0, "running %d locks for this lockres\n", mres->num_locks); + for (i=0; i<mres->num_locks; i++) { + ml = &(mres->ml[i]); + BUG_ON(ml->highest_blocked != LKM_IVMODE); + newlock = NULL; + lksb = NULL; + + queue = dlm_list_num_to_pointer(res, ml->list); + + /* if the lock is for the local node it needs to + * be moved to the proper location within the queue. + * do not allocate a new lock structure. */ + if (ml->node == dlm->node_num) { + /* MIGRATION ONLY! */ + BUG_ON(!(mres->flags & DLM_MRES_MIGRATION)); + + spin_lock(&res->spinlock); + list_for_each(iter, queue) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.cookie != ml->cookie) + lock = NULL; + else + break; + } + + /* lock is always created locally first, and + * destroyed locally last. it must be on the list */ + if (!lock) { + mlog(ML_ERROR, "could not find local lock " + "with cookie %"MLFu64"!\n", + ml->cookie); + BUG(); + } + BUG_ON(lock->ml.node != ml->node); + + /* see NOTE above about why we do not update + * to match the master here */ + + /* move the lock to its proper place */ + /* do not alter lock refcount. switching lists. */ + list_del_init(&lock->list); + list_add_tail(&lock->list, queue); + spin_unlock(&res->spinlock); + + mlog(0, "just reordered a local lock!\n"); + continue; + } + + /* lock is for another node. */ + newlock = dlm_new_lock(ml->type, ml->node, + be64_to_cpu(ml->cookie), NULL); + if (!newlock) { + ret = -ENOMEM; + goto leave; + } + lksb = newlock->lksb; + dlm_lock_attach_lockres(newlock, res); + + if (ml->convert_type != LKM_IVMODE) { + BUG_ON(queue != &res->converting); + newlock->ml.convert_type = ml->convert_type; + } + lksb->flags |= (ml->flags & + (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); + + if (mres->lvb[0]) { + if (lksb->flags & DLM_LKSB_PUT_LVB) { + /* other node was trying to update + * lvb when node died. recreate the + * lksb with the updated lvb. */ + memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN); + } else { + /* otherwise, the node is sending its + * most recent valid lvb info */ + BUG_ON(ml->type != LKM_EXMODE && + ml->type != LKM_PRMODE); + if (res->lvb[0] && (ml->type == LKM_EXMODE || + memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) { + mlog(ML_ERROR, "received bad lvb!\n"); + __dlm_print_one_lock_resource(res); + BUG(); + } + memcpy(res->lvb, mres->lvb, DLM_LVB_LEN); + } + } + + + /* NOTE: + * wrt lock queue ordering and recovery: + * 1. order of locks on granted queue is + * meaningless. + * 2. order of locks on converting queue is + * LOST with the node death. sorry charlie. + * 3. order of locks on the blocked queue is + * also LOST. + * order of locks does not affect integrity, it + * just means that a lock request may get pushed + * back in line as a result of the node death. + * also note that for a given node the lock order + * for its secondary queue locks is preserved + * relative to each other, but clearly *not* + * preserved relative to locks from other nodes. + */ + spin_lock(&res->spinlock); + dlm_lock_get(newlock); + list_add_tail(&newlock->list, queue); + spin_unlock(&res->spinlock); + } + mlog(0, "done running all the locks\n"); + +leave: + if (ret < 0) { + mlog_errno(ret); + if (newlock) + dlm_lock_put(newlock); + } + + mlog_exit(ret); + return ret; +} + +void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + int i; + struct list_head *queue, *iter, *iter2; + struct dlm_lock *lock; + + res->state |= DLM_LOCK_RES_RECOVERING; + if (!list_empty(&res->recovering)) + list_del_init(&res->recovering); + list_add_tail(&res->recovering, &dlm->reco.resources); + + /* find any pending locks and put them back on proper list */ + for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) { + queue = dlm_list_idx_to_ptr(res, i); + list_for_each_safe(iter, iter2, queue) { + lock = list_entry (iter, struct dlm_lock, list); + dlm_lock_get(lock); + if (lock->convert_pending) { + /* move converting lock back to granted */ + BUG_ON(i != DLM_CONVERTING_LIST); + mlog(0, "node died with convert pending " + "on %.*s. move back to granted list.\n", + res->lockname.len, res->lockname.name); + dlm_revert_pending_convert(res, lock); + lock->convert_pending = 0; + } else if (lock->lock_pending) { + /* remove pending lock requests completely */ + BUG_ON(i != DLM_BLOCKED_LIST); + mlog(0, "node died with lock pending " + "on %.*s. remove from blocked list and skip.\n", + res->lockname.len, res->lockname.name); + /* lock will be floating until ref in + * dlmlock_remote is freed after the network + * call returns. ok for it to not be on any + * list since no ast can be called + * (the master is dead). */ + dlm_revert_pending_lock(res, lock); + lock->lock_pending = 0; + } else if (lock->unlock_pending) { + /* if an unlock was in progress, treat as + * if this had completed successfully + * before sending this lock state to the + * new master. note that the dlm_unlock + * call is still responsible for calling + * the unlockast. that will happen after + * the network call times out. for now, + * just move lists to prepare the new + * recovery master. */ + BUG_ON(i != DLM_GRANTED_LIST); + mlog(0, "node died with unlock pending " + "on %.*s. remove from blocked list and skip.\n", + res->lockname.len, res->lockname.name); + dlm_commit_pending_unlock(res, lock); + lock->unlock_pending = 0; + } else if (lock->cancel_pending) { + /* if a cancel was in progress, treat as + * if this had completed successfully + * before sending this lock state to the + * new master */ + BUG_ON(i != DLM_CONVERTING_LIST); + mlog(0, "node died with cancel pending " + "on %.*s. move back to granted list.\n", + res->lockname.len, res->lockname.name); + dlm_commit_pending_cancel(res, lock); + lock->cancel_pending = 0; + } + dlm_lock_put(lock); + } + } +} + + + +/* removes all recovered locks from the recovery list. + * sets the res->owner to the new master. + * unsets the RECOVERY flag and wakes waiters. */ +static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, + u8 dead_node, u8 new_master) +{ + int i; + struct list_head *iter, *iter2, *bucket; + struct dlm_lock_resource *res; + + mlog_entry_void(); + + assert_spin_locked(&dlm->spinlock); + + list_for_each_safe(iter, iter2, &dlm->reco.resources) { + res = list_entry (iter, struct dlm_lock_resource, recovering); + if (res->owner == dead_node) { + list_del_init(&res->recovering); + spin_lock(&res->spinlock); + dlm_change_lockres_owner(dlm, res, new_master); + res->state &= ~DLM_LOCK_RES_RECOVERING; + __dlm_dirty_lockres(dlm, res); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + } + } + + /* this will become unnecessary eventually, but + * for now we need to run the whole hash, clear + * the RECOVERING state and set the owner + * if necessary */ + for (i=0; i<DLM_HASH_SIZE; i++) { + bucket = &(dlm->resources[i]); + list_for_each(iter, bucket) { + res = list_entry (iter, struct dlm_lock_resource, list); + if (res->state & DLM_LOCK_RES_RECOVERING) { + if (res->owner == dead_node) { + mlog(0, "(this=%u) res %.*s owner=%u " + "was not on recovering list, but " + "clearing state anyway\n", + dlm->node_num, res->lockname.len, + res->lockname.name, new_master); + } else if (res->owner == dlm->node_num) { + mlog(0, "(this=%u) res %.*s owner=%u " + "was not on recovering list, " + "owner is THIS node, clearing\n", + dlm->node_num, res->lockname.len, + res->lockname.name, new_master); + } else + continue; + + spin_lock(&res->spinlock); + dlm_change_lockres_owner(dlm, res, new_master); + res->state &= ~DLM_LOCK_RES_RECOVERING; + __dlm_dirty_lockres(dlm, res); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + } + } + } +} + +static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local) +{ + if (local) { + if (lock->ml.type != LKM_EXMODE && + lock->ml.type != LKM_PRMODE) + return 1; + } else if (lock->ml.type == LKM_EXMODE) + return 1; + return 0; +} + +static void dlm_revalidate_lvb(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, u8 dead_node) +{ + struct list_head *iter, *queue; + struct dlm_lock *lock; + int blank_lvb = 0, local = 0; + int i; + u8 search_node; + + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&res->spinlock); + + if (res->owner == dlm->node_num) + /* if this node owned the lockres, and if the dead node + * had an EX when he died, blank out the lvb */ + search_node = dead_node; + else { + /* if this is a secondary lockres, and we had no EX or PR + * locks granted, we can no longer trust the lvb */ + search_node = dlm->node_num; + local = 1; /* check local state for valid lvb */ + } + + for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) { + queue = dlm_list_idx_to_ptr(res, i); + list_for_each(iter, queue) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node == search_node) { + if (dlm_lvb_needs_invalidation(lock, local)) { + /* zero the lksb lvb and lockres lvb */ + blank_lvb = 1; + memset(lock->lksb->lvb, 0, DLM_LVB_LEN); + } + } + } + } + + if (blank_lvb) { + mlog(0, "clearing %.*s lvb, dead node %u had EX\n", + res->lockname.len, res->lockname.name, dead_node); + memset(res->lvb, 0, DLM_LVB_LEN); + } +} + +static void dlm_free_dead_locks(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, u8 dead_node) +{ + struct list_head *iter, *tmpiter; + struct dlm_lock *lock; + + /* this node is the lockres master: + * 1) remove any stale locks for the dead node + * 2) if the dead node had an EX when he died, blank out the lvb + */ + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&res->spinlock); + + /* TODO: check pending_asts, pending_basts here */ + list_for_each_safe(iter, tmpiter, &res->granted) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node == dead_node) { + list_del_init(&lock->list); + dlm_lock_put(lock); + } + } + list_for_each_safe(iter, tmpiter, &res->converting) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node == dead_node) { + list_del_init(&lock->list); + dlm_lock_put(lock); + } + } + list_for_each_safe(iter, tmpiter, &res->blocked) { + lock = list_entry (iter, struct dlm_lock, list); + if (lock->ml.node == dead_node) { + list_del_init(&lock->list); + dlm_lock_put(lock); + } + } + + /* do not kick thread yet */ + __dlm_dirty_lockres(dlm, res); +} + +/* if this node is the recovery master, and there are no + * locks for a given lockres owned by this node that are in + * either PR or EX mode, zero out the lvb before requesting. + * + */ + + +static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node) +{ + struct list_head *iter; + struct dlm_lock_resource *res; + int i; + struct list_head *bucket; + + + /* purge any stale mles */ + dlm_clean_master_list(dlm, dead_node); + + /* + * now clean up all lock resources. there are two rules: + * + * 1) if the dead node was the master, move the lockres + * to the recovering list. set the RECOVERING flag. + * this lockres needs to be cleaned up before it can + * be used further. + * + * 2) if this node was the master, remove all locks from + * each of the lockres queues that were owned by the + * dead node. once recovery finishes, the dlm thread + * can be kicked again to see if any ASTs or BASTs + * need to be fired as a result. + */ + for (i=0; i<DLM_HASH_SIZE; i++) { + bucket = &(dlm->resources[i]); + list_for_each(iter, bucket) { + res = list_entry (iter, struct dlm_lock_resource, list); + if (dlm_is_recovery_lock(res->lockname.name, + res->lockname.len)) + continue; + + spin_lock(&res->spinlock); + /* zero the lvb if necessary */ + dlm_revalidate_lvb(dlm, res, dead_node); + if (res->owner == dead_node) + dlm_move_lockres_to_recovery_list(dlm, res); + else if (res->owner == dlm->node_num) { + dlm_free_dead_locks(dlm, res, dead_node); + __dlm_lockres_calc_usage(dlm, res); + } + spin_unlock(&res->spinlock); + } + } + +} + +static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx) +{ + assert_spin_locked(&dlm->spinlock); + + /* check to see if the node is already considered dead */ + if (!test_bit(idx, dlm->live_nodes_map)) { + mlog(0, "for domain %s, node %d is already dead. " + "another node likely did recovery already.\n", + dlm->name, idx); + return; + } + + /* check to see if we do not care about this node */ + if (!test_bit(idx, dlm->domain_map)) { + /* This also catches the case that we get a node down + * but haven't joined the domain yet. */ + mlog(0, "node %u already removed from domain!\n", idx); + return; + } + + clear_bit(idx, dlm->live_nodes_map); + + /* Clean up join state on node death. */ + if (dlm->joining_node == idx) { + mlog(0, "Clearing join state for node %u\n", idx); + __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); + } + + /* make sure local cleanup occurs before the heartbeat events */ + if (!test_bit(idx, dlm->recovery_map)) + dlm_do_local_recovery_cleanup(dlm, idx); + + /* notify anything attached to the heartbeat events */ + dlm_hb_event_notify_attached(dlm, idx, 0); + + mlog(0, "node %u being removed from domain map!\n", idx); + clear_bit(idx, dlm->domain_map); + /* wake up migration waiters if a node goes down. + * perhaps later we can genericize this for other waiters. */ + wake_up(&dlm->migration_wq); + + if (test_bit(idx, dlm->recovery_map)) + mlog(0, "domain %s, node %u already added " + "to recovery map!\n", dlm->name, idx); + else + set_bit(idx, dlm->recovery_map); +} + +void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data) +{ + struct dlm_ctxt *dlm = data; + + if (!dlm_grab(dlm)) + return; + + spin_lock(&dlm->spinlock); + __dlm_hb_node_down(dlm, idx); + spin_unlock(&dlm->spinlock); + + dlm_put(dlm); +} + +void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data) +{ + struct dlm_ctxt *dlm = data; + + if (!dlm_grab(dlm)) + return; + + spin_lock(&dlm->spinlock); + + set_bit(idx, dlm->live_nodes_map); + + /* notify any mles attached to the heartbeat events */ + dlm_hb_event_notify_attached(dlm, idx, 1); + + spin_unlock(&dlm->spinlock); + + dlm_put(dlm); +} + +static void dlm_reco_ast(void *astdata) +{ + struct dlm_ctxt *dlm = astdata; + mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n", + dlm->node_num, dlm->name); +} +static void dlm_reco_bast(void *astdata, int blocked_type) +{ + struct dlm_ctxt *dlm = astdata; + mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n", + dlm->node_num, dlm->name); +} +static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st) +{ + mlog(0, "unlockast for recovery lock fired!\n"); +} + + +static int dlm_pick_recovery_master(struct dlm_ctxt *dlm) +{ + enum dlm_status ret; + struct dlm_lockstatus lksb; + int status = -EINVAL; + + mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n", + dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num); +retry: + memset(&lksb, 0, sizeof(lksb)); + + ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY, + DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast); + + if (ret == DLM_NORMAL) { + mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n", + dlm->name, dlm->node_num); + /* I am master, send message to all nodes saying + * that I am beginning a recovery session */ + status = dlm_send_begin_reco_message(dlm, + dlm->reco.dead_node); + + /* recovery lock is a special case. ast will not get fired, + * so just go ahead and unlock it. */ + ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm); + if (ret != DLM_NORMAL) { + /* this would really suck. this could only happen + * if there was a network error during the unlock + * because of node death. this means the unlock + * is actually "done" and the lock structure is + * even freed. we can continue, but only + * because this specific lock name is special. */ + mlog(0, "dlmunlock returned %d\n", ret); + } + + if (status < 0) { + mlog(0, "failed to send recovery message. " + "must retry with new node map.\n"); + goto retry; + } + } else if (ret == DLM_NOTQUEUED) { + mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n", + dlm->name, dlm->node_num); + /* another node is master. wait on + * reco.new_master != O2NM_INVALID_NODE_NUM */ + status = -EEXIST; + } + + return status; +} + +static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node) +{ + struct dlm_begin_reco br; + int ret = 0; + struct dlm_node_iter iter; + int nodenum; + int status; + + mlog_entry("%u\n", dead_node); + + mlog(0, "dead node is %u\n", dead_node); + + spin_lock(&dlm->spinlock); + dlm_node_iter_init(dlm->domain_map, &iter); + spin_unlock(&dlm->spinlock); + + clear_bit(dead_node, iter.node_map); + + memset(&br, 0, sizeof(br)); + br.node_idx = dlm->node_num; + br.dead_node = dead_node; + + while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { + ret = 0; + if (nodenum == dead_node) { + mlog(0, "not sending begin reco to dead node " + "%u\n", dead_node); + continue; + } + if (nodenum == dlm->node_num) { + mlog(0, "not sending begin reco to self\n"); + continue; + } + + ret = -EINVAL; + mlog(0, "attempting to send begin reco msg to %d\n", + nodenum); + ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key, + &br, sizeof(br), nodenum, &status); + /* negative status is handled ok by caller here */ + if (ret >= 0) + ret = status; + if (ret < 0) { + struct dlm_lock_resource *res; + mlog_errno(ret); + mlog(ML_ERROR, "begin reco of dlm %s to node %u " + " returned %d\n", dlm->name, nodenum, ret); + res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME, + DLM_RECOVERY_LOCK_NAME_LEN); + if (res) { + dlm_print_one_lock_resource(res); + dlm_lockres_put(res); + } else { + mlog(ML_ERROR, "recovery lock not found\n"); + } + break; + } + } + + return ret; +} + +int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf; + + /* ok to return 0, domain has gone away */ + if (!dlm_grab(dlm)) + return 0; + + mlog(0, "node %u wants to recover node %u\n", + br->node_idx, br->dead_node); + + dlm_fire_domain_eviction_callbacks(dlm, br->dead_node); + + spin_lock(&dlm->spinlock); + if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) { + mlog(0, "new_master already set to %u!\n", + dlm->reco.new_master); + } + if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) { + mlog(0, "dead_node already set to %u!\n", + dlm->reco.dead_node); + } + dlm->reco.new_master = br->node_idx; + dlm->reco.dead_node = br->dead_node; + if (!test_bit(br->dead_node, dlm->recovery_map)) { + mlog(ML_ERROR, "recovery master %u sees %u as dead, but this " + "node has not yet. marking %u as dead\n", + br->node_idx, br->dead_node, br->dead_node); + __dlm_hb_node_down(dlm, br->dead_node); + } + spin_unlock(&dlm->spinlock); + + dlm_kick_recovery_thread(dlm); + dlm_put(dlm); + return 0; +} + +static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) +{ + int ret = 0; + struct dlm_finalize_reco fr; + struct dlm_node_iter iter; + int nodenum; + int status; + + mlog(0, "finishing recovery for node %s:%u\n", + dlm->name, dlm->reco.dead_node); + + spin_lock(&dlm->spinlock); + dlm_node_iter_init(dlm->domain_map, &iter); + spin_unlock(&dlm->spinlock); + + memset(&fr, 0, sizeof(fr)); + fr.node_idx = dlm->node_num; + fr.dead_node = dlm->reco.dead_node; + + while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { + if (nodenum == dlm->node_num) + continue; + ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key, + &fr, sizeof(fr), nodenum, &status); + if (ret >= 0) { + ret = status; + if (dlm_is_host_down(ret)) { + /* this has no effect on this recovery + * session, so set the status to zero to + * finish out the last recovery */ + mlog(ML_ERROR, "node %u went down after this " + "node finished recovery.\n", nodenum); + ret = 0; + } + } + if (ret < 0) { + mlog_errno(ret); + break; + } + } + + return ret; +} + +int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf; + + /* ok to return 0, domain has gone away */ + if (!dlm_grab(dlm)) + return 0; + + mlog(0, "node %u finalizing recovery of node %u\n", + fr->node_idx, fr->dead_node); + + spin_lock(&dlm->spinlock); + + if (dlm->reco.new_master != fr->node_idx) { + mlog(ML_ERROR, "node %u sent recovery finalize msg, but node " + "%u is supposed to be the new master, dead=%u\n", + fr->node_idx, dlm->reco.new_master, fr->dead_node); + BUG(); + } + if (dlm->reco.dead_node != fr->dead_node) { + mlog(ML_ERROR, "node %u sent recovery finalize msg for dead " + "node %u, but node %u is supposed to be dead\n", + fr->node_idx, fr->dead_node, dlm->reco.dead_node); + BUG(); + } + + dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx); + + spin_unlock(&dlm->spinlock); + + dlm_reset_recovery(dlm); + + dlm_kick_recovery_thread(dlm); + dlm_put(dlm); + return 0; +} diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c new file mode 100644 index 0000000..5be9d14 --- /dev/null +++ b/fs/ocfs2/dlm/dlmthread.c @@ -0,0 +1,692 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmthread.c + * + * standalone DLM module + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/timer.h> +#include <linux/kthread.h> + + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" +#include "dlmdomain.h" + +#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_THREAD) +#include "cluster/masklog.h" + +static int dlm_thread(void *data); + +static void dlm_flush_asts(struct dlm_ctxt *dlm); + +#define dlm_lock_is_remote(dlm, lock) ((lock)->ml.node != (dlm)->node_num) + +/* will exit holding res->spinlock, but may drop in function */ +/* waits until flags are cleared on res->state */ +void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags) +{ + DECLARE_WAITQUEUE(wait, current); + + assert_spin_locked(&res->spinlock); + + add_wait_queue(&res->wq, &wait); +repeat: + set_current_state(TASK_UNINTERRUPTIBLE); + if (res->state & flags) { + spin_unlock(&res->spinlock); + schedule(); + spin_lock(&res->spinlock); + goto repeat; + } + remove_wait_queue(&res->wq, &wait); + current->state = TASK_RUNNING; +} + + +static int __dlm_lockres_unused(struct dlm_lock_resource *res) +{ + if (list_empty(&res->granted) && + list_empty(&res->converting) && + list_empty(&res->blocked) && + list_empty(&res->dirty)) + return 1; + return 0; +} + + +/* Call whenever you may have added or deleted something from one of + * the lockres queue's. This will figure out whether it belongs on the + * unused list or not and does the appropriate thing. */ +void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); + + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&res->spinlock); + + if (__dlm_lockres_unused(res)){ + if (list_empty(&res->purge)) { + mlog(0, "putting lockres %.*s from purge list\n", + res->lockname.len, res->lockname.name); + + res->last_used = jiffies; + list_add_tail(&res->purge, &dlm->purge_list); + dlm->purge_count++; + } + } else if (!list_empty(&res->purge)) { + mlog(0, "removing lockres %.*s from purge list\n", + res->lockname.len, res->lockname.name); + + list_del_init(&res->purge); + dlm->purge_count--; + } +} + +void dlm_lockres_calc_usage(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); + spin_lock(&dlm->spinlock); + spin_lock(&res->spinlock); + + __dlm_lockres_calc_usage(dlm, res); + + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); +} + +/* TODO: Eventual API: Called with the dlm spinlock held, may drop it + * to do migration, but will re-acquire before exit. */ +void dlm_purge_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *lockres) +{ + int master; + int ret; + + spin_lock(&lockres->spinlock); + master = lockres->owner == dlm->node_num; + spin_unlock(&lockres->spinlock); + + mlog(0, "purging lockres %.*s, master = %d\n", lockres->lockname.len, + lockres->lockname.name, master); + + /* Non master is the easy case -- no migration required, just + * quit. */ + if (!master) + goto finish; + + /* Wheee! Migrate lockres here! */ + spin_unlock(&dlm->spinlock); +again: + + ret = dlm_migrate_lockres(dlm, lockres, O2NM_MAX_NODES); + if (ret == -ENOTEMPTY) { + mlog(ML_ERROR, "lockres %.*s still has local locks!\n", + lockres->lockname.len, lockres->lockname.name); + + BUG(); + } else if (ret < 0) { + mlog(ML_NOTICE, "lockres %.*s: migrate failed, retrying\n", + lockres->lockname.len, lockres->lockname.name); + goto again; + } + + spin_lock(&dlm->spinlock); + +finish: + if (!list_empty(&lockres->purge)) { + list_del_init(&lockres->purge); + dlm->purge_count--; + } + __dlm_unhash_lockres(lockres); +} + +static void dlm_run_purge_list(struct dlm_ctxt *dlm, + int purge_now) +{ + unsigned int run_max, unused; + unsigned long purge_jiffies; + struct dlm_lock_resource *lockres; + + spin_lock(&dlm->spinlock); + run_max = dlm->purge_count; + + while(run_max && !list_empty(&dlm->purge_list)) { + run_max--; + + lockres = list_entry(dlm->purge_list.next, + struct dlm_lock_resource, purge); + + /* Status of the lockres *might* change so double + * check. If the lockres is unused, holding the dlm + * spinlock will prevent people from getting and more + * refs on it -- there's no need to keep the lockres + * spinlock. */ + spin_lock(&lockres->spinlock); + unused = __dlm_lockres_unused(lockres); + spin_unlock(&lockres->spinlock); + + if (!unused) + continue; + + purge_jiffies = lockres->last_used + + msecs_to_jiffies(DLM_PURGE_INTERVAL_MS); + + /* Make sure that we want to be processing this guy at + * this time. */ + if (!purge_now && time_after(purge_jiffies, jiffies)) { + /* Since resources are added to the purge list + * in tail order, we can stop at the first + * unpurgable resource -- anyone added after + * him will have a greater last_used value */ + break; + } + + list_del_init(&lockres->purge); + dlm->purge_count--; + + /* This may drop and reacquire the dlm spinlock if it + * has to do migration. */ + mlog(0, "calling dlm_purge_lockres!\n"); + dlm_purge_lockres(dlm, lockres); + mlog(0, "DONE calling dlm_purge_lockres!\n"); + + /* Avoid adding any scheduling latencies */ + cond_resched_lock(&dlm->spinlock); + } + + spin_unlock(&dlm->spinlock); +} + +static void dlm_shuffle_lists(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res) +{ + struct dlm_lock *lock, *target; + struct list_head *iter; + struct list_head *head; + int can_grant = 1; + + //mlog(0, "res->lockname.len=%d\n", res->lockname.len); + //mlog(0, "res->lockname.name=%p\n", res->lockname.name); + //mlog(0, "shuffle res %.*s\n", res->lockname.len, + // res->lockname.name); + + /* because this function is called with the lockres + * spinlock, and because we know that it is not migrating/ + * recovering/in-progress, it is fine to reserve asts and + * basts right before queueing them all throughout */ + assert_spin_locked(&res->spinlock); + BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING| + DLM_LOCK_RES_RECOVERING| + DLM_LOCK_RES_IN_PROGRESS))); + +converting: + if (list_empty(&res->converting)) + goto blocked; + mlog(0, "res %.*s has locks on a convert queue\n", res->lockname.len, + res->lockname.name); + + target = list_entry(res->converting.next, struct dlm_lock, list); + if (target->ml.convert_type == LKM_IVMODE) { + mlog(ML_ERROR, "%.*s: converting a lock with no " + "convert_type!\n", res->lockname.len, res->lockname.name); + BUG(); + } + head = &res->granted; + list_for_each(iter, head) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock==target) + continue; + if (!dlm_lock_compatible(lock->ml.type, + target->ml.convert_type)) { + can_grant = 0; + /* queue the BAST if not already */ + if (lock->ml.highest_blocked == LKM_IVMODE) { + __dlm_lockres_reserve_ast(res); + dlm_queue_bast(dlm, lock); + } + /* update the highest_blocked if needed */ + if (lock->ml.highest_blocked < target->ml.convert_type) + lock->ml.highest_blocked = + target->ml.convert_type; + } + } + head = &res->converting; + list_for_each(iter, head) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock==target) + continue; + if (!dlm_lock_compatible(lock->ml.type, + target->ml.convert_type)) { + can_grant = 0; + if (lock->ml.highest_blocked == LKM_IVMODE) { + __dlm_lockres_reserve_ast(res); + dlm_queue_bast(dlm, lock); + } + if (lock->ml.highest_blocked < target->ml.convert_type) + lock->ml.highest_blocked = + target->ml.convert_type; + } + } + + /* we can convert the lock */ + if (can_grant) { + spin_lock(&target->spinlock); + BUG_ON(target->ml.highest_blocked != LKM_IVMODE); + + mlog(0, "calling ast for converting lock: %.*s, have: %d, " + "granting: %d, node: %u\n", res->lockname.len, + res->lockname.name, target->ml.type, + target->ml.convert_type, target->ml.node); + + target->ml.type = target->ml.convert_type; + target->ml.convert_type = LKM_IVMODE; + list_del_init(&target->list); + list_add_tail(&target->list, &res->granted); + + BUG_ON(!target->lksb); + target->lksb->status = DLM_NORMAL; + + spin_unlock(&target->spinlock); + + __dlm_lockres_reserve_ast(res); + dlm_queue_ast(dlm, target); + /* go back and check for more */ + goto converting; + } + +blocked: + if (list_empty(&res->blocked)) + goto leave; + target = list_entry(res->blocked.next, struct dlm_lock, list); + + head = &res->granted; + list_for_each(iter, head) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock==target) + continue; + if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) { + can_grant = 0; + if (lock->ml.highest_blocked == LKM_IVMODE) { + __dlm_lockres_reserve_ast(res); + dlm_queue_bast(dlm, lock); + } + if (lock->ml.highest_blocked < target->ml.type) + lock->ml.highest_blocked = target->ml.type; + } + } + + head = &res->converting; + list_for_each(iter, head) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock==target) + continue; + if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) { + can_grant = 0; + if (lock->ml.highest_blocked == LKM_IVMODE) { + __dlm_lockres_reserve_ast(res); + dlm_queue_bast(dlm, lock); + } + if (lock->ml.highest_blocked < target->ml.type) + lock->ml.highest_blocked = target->ml.type; + } + } + + /* we can grant the blocked lock (only + * possible if converting list empty) */ + if (can_grant) { + spin_lock(&target->spinlock); + BUG_ON(target->ml.highest_blocked != LKM_IVMODE); + + mlog(0, "calling ast for blocked lock: %.*s, granting: %d, " + "node: %u\n", res->lockname.len, res->lockname.name, + target->ml.type, target->ml.node); + + // target->ml.type is already correct + list_del_init(&target->list); + list_add_tail(&target->list, &res->granted); + + BUG_ON(!target->lksb); + target->lksb->status = DLM_NORMAL; + + spin_unlock(&target->spinlock); + + __dlm_lockres_reserve_ast(res); + dlm_queue_ast(dlm, target); + /* go back and check for more */ + goto converting; + } + +leave: + return; +} + +/* must have NO locks when calling this with res !=NULL * */ +void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) +{ + mlog_entry("dlm=%p, res=%p\n", dlm, res); + if (res) { + spin_lock(&dlm->spinlock); + spin_lock(&res->spinlock); + __dlm_dirty_lockres(dlm, res); + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + } + wake_up(&dlm->dlm_thread_wq); +} + +void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) +{ + mlog_entry("dlm=%p, res=%p\n", dlm, res); + + assert_spin_locked(&dlm->spinlock); + assert_spin_locked(&res->spinlock); + + /* don't shuffle secondary queues */ + if ((res->owner == dlm->node_num) && + !(res->state & DLM_LOCK_RES_DIRTY)) { + list_add_tail(&res->dirty, &dlm->dirty_list); + res->state |= DLM_LOCK_RES_DIRTY; + } +} + + +/* Launch the NM thread for the mounted volume */ +int dlm_launch_thread(struct dlm_ctxt *dlm) +{ + mlog(0, "starting dlm thread...\n"); + + dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread"); + if (IS_ERR(dlm->dlm_thread_task)) { + mlog_errno(PTR_ERR(dlm->dlm_thread_task)); + dlm->dlm_thread_task = NULL; + return -EINVAL; + } + + return 0; +} + +void dlm_complete_thread(struct dlm_ctxt *dlm) +{ + if (dlm->dlm_thread_task) { + mlog(ML_KTHREAD, "waiting for dlm thread to exit\n"); + kthread_stop(dlm->dlm_thread_task); + dlm->dlm_thread_task = NULL; + } +} + +static int dlm_dirty_list_empty(struct dlm_ctxt *dlm) +{ + int empty; + + spin_lock(&dlm->spinlock); + empty = list_empty(&dlm->dirty_list); + spin_unlock(&dlm->spinlock); + + return empty; +} + +static void dlm_flush_asts(struct dlm_ctxt *dlm) +{ + int ret; + struct dlm_lock *lock; + struct dlm_lock_resource *res; + u8 hi; + + spin_lock(&dlm->ast_lock); + while (!list_empty(&dlm->pending_asts)) { + lock = list_entry(dlm->pending_asts.next, + struct dlm_lock, ast_list); + /* get an extra ref on lock */ + dlm_lock_get(lock); + res = lock->lockres; + mlog(0, "delivering an ast for this lockres\n"); + + BUG_ON(!lock->ast_pending); + + /* remove from list (including ref) */ + list_del_init(&lock->ast_list); + dlm_lock_put(lock); + spin_unlock(&dlm->ast_lock); + + if (lock->ml.node != dlm->node_num) { + ret = dlm_do_remote_ast(dlm, res, lock); + if (ret < 0) + mlog_errno(ret); + } else + dlm_do_local_ast(dlm, res, lock); + + spin_lock(&dlm->ast_lock); + + /* possible that another ast was queued while + * we were delivering the last one */ + if (!list_empty(&lock->ast_list)) { + mlog(0, "aha another ast got queued while " + "we were finishing the last one. will " + "keep the ast_pending flag set.\n"); + } else + lock->ast_pending = 0; + + /* drop the extra ref. + * this may drop it completely. */ + dlm_lock_put(lock); + dlm_lockres_release_ast(dlm, res); + } + + while (!list_empty(&dlm->pending_basts)) { + lock = list_entry(dlm->pending_basts.next, + struct dlm_lock, bast_list); + /* get an extra ref on lock */ + dlm_lock_get(lock); + res = lock->lockres; + + BUG_ON(!lock->bast_pending); + + /* get the highest blocked lock, and reset */ + spin_lock(&lock->spinlock); + BUG_ON(lock->ml.highest_blocked <= LKM_IVMODE); + hi = lock->ml.highest_blocked; + lock->ml.highest_blocked = LKM_IVMODE; + spin_unlock(&lock->spinlock); + + /* remove from list (including ref) */ + list_del_init(&lock->bast_list); + dlm_lock_put(lock); + spin_unlock(&dlm->ast_lock); + + mlog(0, "delivering a bast for this lockres " + "(blocked = %d\n", hi); + + if (lock->ml.node != dlm->node_num) { + ret = dlm_send_proxy_bast(dlm, res, lock, hi); + if (ret < 0) + mlog_errno(ret); + } else + dlm_do_local_bast(dlm, res, lock, hi); + + spin_lock(&dlm->ast_lock); + + /* possible that another bast was queued while + * we were delivering the last one */ + if (!list_empty(&lock->bast_list)) { + mlog(0, "aha another bast got queued while " + "we were finishing the last one. will " + "keep the bast_pending flag set.\n"); + } else + lock->bast_pending = 0; + + /* drop the extra ref. + * this may drop it completely. */ + dlm_lock_put(lock); + dlm_lockres_release_ast(dlm, res); + } + wake_up(&dlm->ast_wq); + spin_unlock(&dlm->ast_lock); +} + + +#define DLM_THREAD_TIMEOUT_MS (4 * 1000) +#define DLM_THREAD_MAX_DIRTY 100 +#define DLM_THREAD_MAX_ASTS 10 + +static int dlm_thread(void *data) +{ + struct dlm_lock_resource *res; + struct dlm_ctxt *dlm = data; + unsigned long timeout = msecs_to_jiffies(DLM_THREAD_TIMEOUT_MS); + + mlog(0, "dlm thread running for %s...\n", dlm->name); + + while (!kthread_should_stop()) { + int n = DLM_THREAD_MAX_DIRTY; + + /* dlm_shutting_down is very point-in-time, but that + * doesn't matter as we'll just loop back around if we + * get false on the leading edge of a state + * transition. */ + dlm_run_purge_list(dlm, dlm_shutting_down(dlm)); + + /* We really don't want to hold dlm->spinlock while + * calling dlm_shuffle_lists on each lockres that + * needs to have its queues adjusted and AST/BASTs + * run. So let's pull each entry off the dirty_list + * and drop dlm->spinlock ASAP. Once off the list, + * res->spinlock needs to be taken again to protect + * the queues while calling dlm_shuffle_lists. */ + spin_lock(&dlm->spinlock); + while (!list_empty(&dlm->dirty_list)) { + int delay = 0; + res = list_entry(dlm->dirty_list.next, + struct dlm_lock_resource, dirty); + + /* peel a lockres off, remove it from the list, + * unset the dirty flag and drop the dlm lock */ + BUG_ON(!res); + dlm_lockres_get(res); + + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_DIRTY; + list_del_init(&res->dirty); + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + + /* lockres can be re-dirtied/re-added to the + * dirty_list in this gap, but that is ok */ + + spin_lock(&res->spinlock); + if (res->owner != dlm->node_num) { + __dlm_print_one_lock_resource(res); + mlog(ML_ERROR, "inprog:%s, mig:%s, reco:%s, dirty:%s\n", + res->state & DLM_LOCK_RES_IN_PROGRESS ? "yes" : "no", + res->state & DLM_LOCK_RES_MIGRATING ? "yes" : "no", + res->state & DLM_LOCK_RES_RECOVERING ? "yes" : "no", + res->state & DLM_LOCK_RES_DIRTY ? "yes" : "no"); + } + BUG_ON(res->owner != dlm->node_num); + + /* it is now ok to move lockreses in these states + * to the dirty list, assuming that they will only be + * dirty for a short while. */ + if (res->state & (DLM_LOCK_RES_IN_PROGRESS | + DLM_LOCK_RES_MIGRATING | + DLM_LOCK_RES_RECOVERING)) { + /* move it to the tail and keep going */ + spin_unlock(&res->spinlock); + mlog(0, "delaying list shuffling for in-" + "progress lockres %.*s, state=%d\n", + res->lockname.len, res->lockname.name, + res->state); + delay = 1; + goto in_progress; + } + + /* at this point the lockres is not migrating/ + * recovering/in-progress. we have the lockres + * spinlock and do NOT have the dlm lock. + * safe to reserve/queue asts and run the lists. */ + + mlog(0, "calling dlm_shuffle_lists with dlm=%p, " + "res=%p\n", dlm, res); + + /* called while holding lockres lock */ + dlm_shuffle_lists(dlm, res); + spin_unlock(&res->spinlock); + + dlm_lockres_calc_usage(dlm, res); + +in_progress: + + spin_lock(&dlm->spinlock); + /* if the lock was in-progress, stick + * it on the back of the list */ + if (delay) { + spin_lock(&res->spinlock); + list_add_tail(&res->dirty, &dlm->dirty_list); + res->state |= DLM_LOCK_RES_DIRTY; + spin_unlock(&res->spinlock); + } + dlm_lockres_put(res); + + /* unlikely, but we may need to give time to + * other tasks */ + if (!--n) { + mlog(0, "throttling dlm_thread\n"); + break; + } + } + + spin_unlock(&dlm->spinlock); + dlm_flush_asts(dlm); + + /* yield and continue right away if there is more work to do */ + if (!n) { + yield(); + continue; + } + + wait_event_interruptible_timeout(dlm->dlm_thread_wq, + !dlm_dirty_list_empty(dlm) || + kthread_should_stop(), + timeout); + } + + mlog(0, "quitting DLM thread\n"); + return 0; +} diff --git a/fs/ocfs2/dlm/dlmunlock.c b/fs/ocfs2/dlm/dlmunlock.c new file mode 100644 index 0000000..cec2ce1 --- /dev/null +++ b/fs/ocfs2/dlm/dlmunlock.c @@ -0,0 +1,672 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmunlock.c + * + * underlying calls for unlocking locks + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/random.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/spinlock.h> +#include <linux/delay.h> + +#include "cluster/heartbeat.h" +#include "cluster/nodemanager.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" +#include "dlmcommon.h" + +#define MLOG_MASK_PREFIX ML_DLM +#include "cluster/masklog.h" + +#define DLM_UNLOCK_FREE_LOCK 0x00000001 +#define DLM_UNLOCK_CALL_AST 0x00000002 +#define DLM_UNLOCK_REMOVE_LOCK 0x00000004 +#define DLM_UNLOCK_REGRANT_LOCK 0x00000008 +#define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 + + +static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int *actions); +static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int *actions); + +static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int flags, + u8 owner); + + +/* + * according to the spec: + * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf + * + * flags & LKM_CANCEL != 0: must be converting or blocked + * flags & LKM_CANCEL == 0: must be granted + * + * So to unlock a converting lock, you must first cancel the + * convert (passing LKM_CANCEL in flags), then call the unlock + * again (with no LKM_CANCEL in flags). + */ + + +/* + * locking: + * caller needs: none + * taken: res->spinlock and lock->spinlock taken and dropped + * held on exit: none + * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network + * all callers should have taken an extra ref on lock coming in + */ +static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int flags, int *call_ast, + int master_node) +{ + enum dlm_status status; + int actions = 0; + int in_use; + u8 owner; + + mlog(0, "master_node = %d, valblk = %d\n", master_node, + flags & LKM_VALBLK); + + if (master_node) + BUG_ON(res->owner != dlm->node_num); + else + BUG_ON(res->owner == dlm->node_num); + + spin_lock(&dlm->spinlock); + /* We want to be sure that we're not freeing a lock + * that still has AST's pending... */ + in_use = !list_empty(&lock->ast_list); + spin_unlock(&dlm->spinlock); + if (in_use) { + mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " + "while waiting for an ast!", res->lockname.len, + res->lockname.name); + return DLM_BADPARAM; + } + + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_IN_PROGRESS) { + if (master_node) { + mlog(ML_ERROR, "lockres in progress!\n"); + spin_unlock(&res->spinlock); + return DLM_FORWARD; + } + /* ok for this to sleep if not in a network handler */ + __dlm_wait_on_lockres(res); + res->state |= DLM_LOCK_RES_IN_PROGRESS; + } + spin_lock(&lock->spinlock); + + if (res->state & DLM_LOCK_RES_RECOVERING) { + status = DLM_RECOVERING; + goto leave; + } + + + /* see above for what the spec says about + * LKM_CANCEL and the lock queue state */ + if (flags & LKM_CANCEL) + status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); + else + status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); + + if (status != DLM_NORMAL) + goto leave; + + /* By now this has been masked out of cancel requests. */ + if (flags & LKM_VALBLK) { + /* make the final update to the lvb */ + if (master_node) + memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); + else + flags |= LKM_PUT_LVB; /* let the send function + * handle it. */ + } + + if (!master_node) { + owner = res->owner; + /* drop locks and send message */ + if (flags & LKM_CANCEL) + lock->cancel_pending = 1; + else + lock->unlock_pending = 1; + spin_unlock(&lock->spinlock); + spin_unlock(&res->spinlock); + status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, + flags, owner); + spin_lock(&res->spinlock); + spin_lock(&lock->spinlock); + /* if the master told us the lock was already granted, + * let the ast handle all of these actions */ + if (status == DLM_NORMAL && + lksb->status == DLM_CANCELGRANT) { + actions &= ~(DLM_UNLOCK_REMOVE_LOCK| + DLM_UNLOCK_REGRANT_LOCK| + DLM_UNLOCK_CLEAR_CONVERT_TYPE); + } + if (flags & LKM_CANCEL) + lock->cancel_pending = 0; + else + lock->unlock_pending = 0; + + } + + /* get an extra ref on lock. if we are just switching + * lists here, we dont want the lock to go away. */ + dlm_lock_get(lock); + + if (actions & DLM_UNLOCK_REMOVE_LOCK) { + list_del_init(&lock->list); + dlm_lock_put(lock); + } + if (actions & DLM_UNLOCK_REGRANT_LOCK) { + dlm_lock_get(lock); + list_add_tail(&lock->list, &res->granted); + } + if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { + mlog(0, "clearing convert_type at %smaster node\n", + master_node ? "" : "non-"); + lock->ml.convert_type = LKM_IVMODE; + } + + /* remove the extra ref on lock */ + dlm_lock_put(lock); + +leave: + res->state &= ~DLM_LOCK_RES_IN_PROGRESS; + if (!dlm_lock_on_list(&res->converting, lock)) + BUG_ON(lock->ml.convert_type != LKM_IVMODE); + else + BUG_ON(lock->ml.convert_type == LKM_IVMODE); + spin_unlock(&lock->spinlock); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + + /* let the caller's final dlm_lock_put handle the actual kfree */ + if (actions & DLM_UNLOCK_FREE_LOCK) { + /* this should always be coupled with list removal */ + BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); + mlog(0, "lock %"MLFu64" should be gone now! refs=%d\n", + lock->ml.cookie, atomic_read(&lock->lock_refs.refcount)-1); + dlm_lock_put(lock); + } + if (actions & DLM_UNLOCK_CALL_AST) + *call_ast = 1; + + /* if cancel or unlock succeeded, lvb work is done */ + if (status == DLM_NORMAL) + lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); + + return status; +} + +void dlm_commit_pending_unlock(struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + /* leave DLM_LKSB_PUT_LVB on the lksb so any final + * update of the lvb will be sent to the new master */ + list_del_init(&lock->list); +} + +void dlm_commit_pending_cancel(struct dlm_lock_resource *res, + struct dlm_lock *lock) +{ + list_del_init(&lock->list); + list_add_tail(&lock->list, &res->granted); + lock->ml.convert_type = LKM_IVMODE; +} + + +static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int flags, + int *call_ast) +{ + return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); +} + +static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int flags, int *call_ast) +{ + return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); +} + +/* + * locking: + * caller needs: none + * taken: none + * held on exit: none + * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network + */ +static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int flags, + u8 owner) +{ + struct dlm_unlock_lock unlock; + int tmpret; + enum dlm_status ret; + int status = 0; + struct kvec vec[2]; + size_t veclen = 1; + + mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); + + memset(&unlock, 0, sizeof(unlock)); + unlock.node_idx = dlm->node_num; + unlock.flags = cpu_to_be32(flags); + unlock.cookie = lock->ml.cookie; + unlock.namelen = res->lockname.len; + memcpy(unlock.name, res->lockname.name, unlock.namelen); + + vec[0].iov_len = sizeof(struct dlm_unlock_lock); + vec[0].iov_base = &unlock; + + if (flags & LKM_PUT_LVB) { + /* extra data to send if we are updating lvb */ + vec[1].iov_len = DLM_LVB_LEN; + vec[1].iov_base = lock->lksb->lvb; + veclen++; + } + + tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, + vec, veclen, owner, &status); + if (tmpret >= 0) { + // successfully sent and received + if (status == DLM_CANCELGRANT) + ret = DLM_NORMAL; + else if (status == DLM_FORWARD) { + mlog(0, "master was in-progress. retry\n"); + ret = DLM_FORWARD; + } else + ret = status; + lksb->status = status; + } else { + mlog_errno(tmpret); + if (dlm_is_host_down(tmpret)) { + /* NOTE: this seems strange, but it is what we want. + * when the master goes down during a cancel or + * unlock, the recovery code completes the operation + * as if the master had not died, then passes the + * updated state to the recovery master. this thread + * just needs to finish out the operation and call + * the unlockast. */ + ret = DLM_NORMAL; + } else { + /* something bad. this will BUG in ocfs2 */ + ret = dlm_err_to_dlm_status(tmpret); + } + lksb->status = ret; + } + + return ret; +} + +/* + * locking: + * caller needs: none + * taken: takes and drops res->spinlock + * held on exit: none + * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, + * return value from dlmunlock_master + */ +int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data) +{ + struct dlm_ctxt *dlm = data; + struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; + struct dlm_lock_resource *res = NULL; + struct list_head *iter; + struct dlm_lock *lock = NULL; + enum dlm_status status = DLM_NORMAL; + int found = 0, i; + struct dlm_lockstatus *lksb = NULL; + int ignore; + u32 flags; + struct list_head *queue; + + flags = be32_to_cpu(unlock->flags); + + if (flags & LKM_GET_LVB) { + mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); + return DLM_BADARGS; + } + + if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { + mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " + "request!\n"); + return DLM_BADARGS; + } + + if (unlock->namelen > DLM_LOCKID_NAME_MAX) { + mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); + return DLM_IVBUFLEN; + } + + if (!dlm_grab(dlm)) + return DLM_REJECTED; + + mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), + "Domain %s not fully joined!\n", dlm->name); + + mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); + + res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); + if (!res) { + /* We assume here that a no lock resource simply means + * it was migrated away and destroyed before the other + * node could detect it. */ + mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); + status = DLM_FORWARD; + goto not_found; + } + + queue=&res->granted; + found = 0; + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_RECOVERING) { + spin_unlock(&res->spinlock); + mlog(0, "returning DLM_RECOVERING\n"); + status = DLM_RECOVERING; + goto leave; + } + + if (res->state & DLM_LOCK_RES_MIGRATING) { + spin_unlock(&res->spinlock); + mlog(0, "returning DLM_MIGRATING\n"); + status = DLM_MIGRATING; + goto leave; + } + + if (res->owner != dlm->node_num) { + spin_unlock(&res->spinlock); + mlog(0, "returning DLM_FORWARD -- not master\n"); + status = DLM_FORWARD; + goto leave; + } + + for (i=0; i<3; i++) { + list_for_each(iter, queue) { + lock = list_entry(iter, struct dlm_lock, list); + if (lock->ml.cookie == unlock->cookie && + lock->ml.node == unlock->node_idx) { + dlm_lock_get(lock); + found = 1; + break; + } + } + if (found) + break; + /* scan granted -> converting -> blocked queues */ + queue++; + } + spin_unlock(&res->spinlock); + if (!found) { + status = DLM_IVLOCKID; + goto not_found; + } + + /* lock was found on queue */ + lksb = lock->lksb; + /* unlockast only called on originating node */ + if (flags & LKM_PUT_LVB) { + lksb->flags |= DLM_LKSB_PUT_LVB; + memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); + } + + /* if this is in-progress, propagate the DLM_FORWARD + * all the way back out */ + status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); + if (status == DLM_FORWARD) + mlog(0, "lockres is in progress\n"); + + if (flags & LKM_PUT_LVB) + lksb->flags &= ~DLM_LKSB_PUT_LVB; + + dlm_lockres_calc_usage(dlm, res); + dlm_kick_thread(dlm, res); + +not_found: + if (!found) + mlog(ML_ERROR, "failed to find lock to unlock! " + "cookie=%"MLFu64"\n", + unlock->cookie); + else { + /* send the lksb->status back to the other node */ + status = lksb->status; + dlm_lock_put(lock); + } + +leave: + if (res) + dlm_lockres_put(res); + + dlm_put(dlm); + + return status; +} + + +static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int *actions) +{ + enum dlm_status status; + + if (dlm_lock_on_list(&res->blocked, lock)) { + /* cancel this outright */ + lksb->status = DLM_NORMAL; + status = DLM_NORMAL; + *actions = (DLM_UNLOCK_CALL_AST | + DLM_UNLOCK_REMOVE_LOCK); + } else if (dlm_lock_on_list(&res->converting, lock)) { + /* cancel the request, put back on granted */ + lksb->status = DLM_NORMAL; + status = DLM_NORMAL; + *actions = (DLM_UNLOCK_CALL_AST | + DLM_UNLOCK_REMOVE_LOCK | + DLM_UNLOCK_REGRANT_LOCK | + DLM_UNLOCK_CLEAR_CONVERT_TYPE); + } else if (dlm_lock_on_list(&res->granted, lock)) { + /* too late, already granted. DLM_CANCELGRANT */ + lksb->status = DLM_CANCELGRANT; + status = DLM_NORMAL; + *actions = DLM_UNLOCK_CALL_AST; + } else { + mlog(ML_ERROR, "lock to cancel is not on any list!\n"); + lksb->status = DLM_IVLOCKID; + status = DLM_IVLOCKID; + *actions = 0; + } + return status; +} + +static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + struct dlm_lock *lock, + struct dlm_lockstatus *lksb, + int *actions) +{ + enum dlm_status status; + + /* unlock request */ + if (!dlm_lock_on_list(&res->granted, lock)) { + lksb->status = DLM_DENIED; + status = DLM_DENIED; + dlm_error(status); + *actions = 0; + } else { + /* unlock granted lock */ + lksb->status = DLM_NORMAL; + status = DLM_NORMAL; + *actions = (DLM_UNLOCK_FREE_LOCK | + DLM_UNLOCK_CALL_AST | + DLM_UNLOCK_REMOVE_LOCK); + } + return status; +} + +/* there seems to be no point in doing this async + * since (even for the remote case) there is really + * no work to queue up... so just do it and fire the + * unlockast by hand when done... */ +enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, + int flags, dlm_astunlockfunc_t *unlockast, void *data) +{ + enum dlm_status status; + struct dlm_lock_resource *res; + struct dlm_lock *lock = NULL; + int call_ast, is_master; + + mlog_entry_void(); + + if (!lksb) { + dlm_error(DLM_BADARGS); + return DLM_BADARGS; + } + + if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { + dlm_error(DLM_BADPARAM); + return DLM_BADPARAM; + } + + if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { + mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); + flags &= ~LKM_VALBLK; + } + + if (!lksb->lockid || !lksb->lockid->lockres) { + dlm_error(DLM_BADPARAM); + return DLM_BADPARAM; + } + + lock = lksb->lockid; + BUG_ON(!lock); + dlm_lock_get(lock); + + res = lock->lockres; + BUG_ON(!res); + dlm_lockres_get(res); +retry: + call_ast = 0; + /* need to retry up here because owner may have changed */ + mlog(0, "lock=%p res=%p\n", lock, res); + + spin_lock(&res->spinlock); + is_master = (res->owner == dlm->node_num); + spin_unlock(&res->spinlock); + + if (is_master) { + status = dlmunlock_master(dlm, res, lock, lksb, flags, + &call_ast); + mlog(0, "done calling dlmunlock_master: returned %d, " + "call_ast is %d\n", status, call_ast); + } else { + status = dlmunlock_remote(dlm, res, lock, lksb, flags, + &call_ast); + mlog(0, "done calling dlmunlock_remote: returned %d, " + "call_ast is %d\n", status, call_ast); + } + + if (status == DLM_RECOVERING || + status == DLM_MIGRATING || + status == DLM_FORWARD) { + /* We want to go away for a tiny bit to allow recovery + * / migration to complete on this resource. I don't + * know of any wait queue we could sleep on as this + * may be happening on another node. Perhaps the + * proper solution is to queue up requests on the + * other end? */ + + /* do we want to yield(); ?? */ + msleep(50); + + mlog(0, "retrying unlock due to pending recovery/" + "migration/in-progress\n"); + goto retry; + } + + if (call_ast) { + mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status); + if (is_master) { + /* it is possible that there is one last bast + * pending. make sure it is flushed, then + * call the unlockast. + * not an issue if this is a mastered remotely, + * since this lock has been removed from the + * lockres queues and cannot be found. */ + dlm_kick_thread(dlm, NULL); + wait_event(dlm->ast_wq, + dlm_lock_basts_flushed(dlm, lock)); + } + (*unlockast)(data, lksb->status); + } + + if (status == DLM_NORMAL) { + mlog(0, "kicking the thread\n"); + dlm_kick_thread(dlm, res); + } else + dlm_error(status); + + dlm_lockres_calc_usage(dlm, res); + dlm_lockres_put(res); + dlm_lock_put(lock); + + mlog(0, "returning status=%d!\n", status); + return status; +} +EXPORT_SYMBOL_GPL(dlmunlock); + diff --git a/fs/ocfs2/dlm/dlmver.c b/fs/ocfs2/dlm/dlmver.c new file mode 100644 index 0000000..7ef2653 --- /dev/null +++ b/fs/ocfs2/dlm/dlmver.c @@ -0,0 +1,42 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmver.c + * + * version string + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> + +#include "dlmver.h" + +#define DLM_BUILD_VERSION "1.3.3" + +#define VERSION_STR "OCFS2 DLM " DLM_BUILD_VERSION + +void dlm_print_version(void) +{ + printk(KERN_INFO "%s\n", VERSION_STR); +} + +MODULE_DESCRIPTION(VERSION_STR); + +MODULE_VERSION(DLM_BUILD_VERSION); diff --git a/fs/ocfs2/dlm/dlmver.h b/fs/ocfs2/dlm/dlmver.h new file mode 100644 index 0000000..f674aee --- /dev/null +++ b/fs/ocfs2/dlm/dlmver.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmfsver.h + * + * Function prototypes + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef DLM_VER_H +#define DLM_VER_H + +void dlm_print_version(void); + +#endif /* DLM_VER_H */ diff --git a/fs/ocfs2/dlm/userdlm.c b/fs/ocfs2/dlm/userdlm.c new file mode 100644 index 0000000..e1fdd28 --- /dev/null +++ b/fs/ocfs2/dlm/userdlm.c @@ -0,0 +1,658 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * userdlm.c + * + * Code which implements the kernel side of a minimal userspace + * interface to our DLM. + * + * Many of the functions here are pared down versions of dlmglue.c + * functions. + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <asm/signal.h> + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/crc32.h> + + +#include "cluster/nodemanager.h" +#include "cluster/heartbeat.h" +#include "cluster/tcp.h" + +#include "dlmapi.h" + +#include "userdlm.h" + +#define MLOG_MASK_PREFIX ML_DLMFS +#include "cluster/masklog.h" + +static inline int user_check_wait_flag(struct user_lock_res *lockres, + int flag) +{ + int ret; + + spin_lock(&lockres->l_lock); + ret = lockres->l_flags & flag; + spin_unlock(&lockres->l_lock); + + return ret; +} + +static inline void user_wait_on_busy_lock(struct user_lock_res *lockres) + +{ + wait_event(lockres->l_event, + !user_check_wait_flag(lockres, USER_LOCK_BUSY)); +} + +static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres) + +{ + wait_event(lockres->l_event, + !user_check_wait_flag(lockres, USER_LOCK_BLOCKED)); +} + +/* I heart container_of... */ +static inline struct dlm_ctxt * +dlm_ctxt_from_user_lockres(struct user_lock_res *lockres) +{ + struct dlmfs_inode_private *ip; + + ip = container_of(lockres, + struct dlmfs_inode_private, + ip_lockres); + return ip->ip_dlm; +} + +static struct inode * +user_dlm_inode_from_user_lockres(struct user_lock_res *lockres) +{ + struct dlmfs_inode_private *ip; + + ip = container_of(lockres, + struct dlmfs_inode_private, + ip_lockres); + return &ip->ip_vfs_inode; +} + +static inline void user_recover_from_dlm_error(struct user_lock_res *lockres) +{ + spin_lock(&lockres->l_lock); + lockres->l_flags &= ~USER_LOCK_BUSY; + spin_unlock(&lockres->l_lock); +} + +#define user_log_dlm_error(_func, _stat, _lockres) do { \ + mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ + "resource %s: %s\n", dlm_errname(_stat), _func, \ + _lockres->l_name, dlm_errmsg(_stat)); \ +} while (0) + +/* WARNING: This function lives in a world where the only three lock + * levels are EX, PR, and NL. It *will* have to be adjusted when more + * lock types are added. */ +static inline int user_highest_compat_lock_level(int level) +{ + int new_level = LKM_EXMODE; + + if (level == LKM_EXMODE) + new_level = LKM_NLMODE; + else if (level == LKM_PRMODE) + new_level = LKM_PRMODE; + return new_level; +} + +static void user_ast(void *opaque) +{ + struct user_lock_res *lockres = opaque; + struct dlm_lockstatus *lksb; + + mlog(0, "AST fired for lockres %s\n", lockres->l_name); + + spin_lock(&lockres->l_lock); + + lksb = &(lockres->l_lksb); + if (lksb->status != DLM_NORMAL) { + mlog(ML_ERROR, "lksb status value of %u on lockres %s\n", + lksb->status, lockres->l_name); + spin_unlock(&lockres->l_lock); + return; + } + + /* we're downconverting. */ + if (lockres->l_requested < lockres->l_level) { + if (lockres->l_requested <= + user_highest_compat_lock_level(lockres->l_blocking)) { + lockres->l_blocking = LKM_NLMODE; + lockres->l_flags &= ~USER_LOCK_BLOCKED; + } + } + + lockres->l_level = lockres->l_requested; + lockres->l_requested = LKM_IVMODE; + lockres->l_flags |= USER_LOCK_ATTACHED; + lockres->l_flags &= ~USER_LOCK_BUSY; + + spin_unlock(&lockres->l_lock); + + wake_up(&lockres->l_event); +} + +static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres) +{ + struct inode *inode; + inode = user_dlm_inode_from_user_lockres(lockres); + if (!igrab(inode)) + BUG(); +} + +static void user_dlm_unblock_lock(void *opaque); + +static void __user_dlm_queue_lockres(struct user_lock_res *lockres) +{ + if (!(lockres->l_flags & USER_LOCK_QUEUED)) { + user_dlm_grab_inode_ref(lockres); + + INIT_WORK(&lockres->l_work, user_dlm_unblock_lock, + lockres); + + queue_work(user_dlm_worker, &lockres->l_work); + lockres->l_flags |= USER_LOCK_QUEUED; + } +} + +static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres) +{ + int queue = 0; + + if (!(lockres->l_flags & USER_LOCK_BLOCKED)) + return; + + switch (lockres->l_blocking) { + case LKM_EXMODE: + if (!lockres->l_ex_holders && !lockres->l_ro_holders) + queue = 1; + break; + case LKM_PRMODE: + if (!lockres->l_ex_holders) + queue = 1; + break; + default: + BUG(); + } + + if (queue) + __user_dlm_queue_lockres(lockres); +} + +static void user_bast(void *opaque, int level) +{ + struct user_lock_res *lockres = opaque; + + mlog(0, "Blocking AST fired for lockres %s. Blocking level %d\n", + lockres->l_name, level); + + spin_lock(&lockres->l_lock); + lockres->l_flags |= USER_LOCK_BLOCKED; + if (level > lockres->l_blocking) + lockres->l_blocking = level; + + __user_dlm_queue_lockres(lockres); + spin_unlock(&lockres->l_lock); + + wake_up(&lockres->l_event); +} + +static void user_unlock_ast(void *opaque, enum dlm_status status) +{ + struct user_lock_res *lockres = opaque; + + mlog(0, "UNLOCK AST called on lock %s\n", lockres->l_name); + + if (status != DLM_NORMAL) + mlog(ML_ERROR, "Dlm returns status %d\n", status); + + spin_lock(&lockres->l_lock); + if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) + lockres->l_level = LKM_IVMODE; + else { + lockres->l_requested = LKM_IVMODE; /* cancel an + * upconvert + * request. */ + lockres->l_flags &= ~USER_LOCK_IN_CANCEL; + /* we want the unblock thread to look at it again + * now. */ + __user_dlm_queue_lockres(lockres); + } + + lockres->l_flags &= ~USER_LOCK_BUSY; + spin_unlock(&lockres->l_lock); + + wake_up(&lockres->l_event); +} + +static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres) +{ + struct inode *inode; + inode = user_dlm_inode_from_user_lockres(lockres); + iput(inode); +} + +static void user_dlm_unblock_lock(void *opaque) +{ + int new_level, status; + struct user_lock_res *lockres = (struct user_lock_res *) opaque; + struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); + + mlog(0, "processing lockres %s\n", lockres->l_name); + + spin_lock(&lockres->l_lock); + + BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED)); + BUG_ON(!(lockres->l_flags & USER_LOCK_QUEUED)); + + /* notice that we don't clear USER_LOCK_BLOCKED here. That's + * for user_ast to do. */ + lockres->l_flags &= ~USER_LOCK_QUEUED; + + if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) { + mlog(0, "lock is in teardown so we do nothing\n"); + spin_unlock(&lockres->l_lock); + goto drop_ref; + } + + if (lockres->l_flags & USER_LOCK_BUSY) { + mlog(0, "BUSY flag detected...\n"); + if (lockres->l_flags & USER_LOCK_IN_CANCEL) { + spin_unlock(&lockres->l_lock); + goto drop_ref; + } + + lockres->l_flags |= USER_LOCK_IN_CANCEL; + spin_unlock(&lockres->l_lock); + + status = dlmunlock(dlm, + &lockres->l_lksb, + LKM_CANCEL, + user_unlock_ast, + lockres); + if (status == DLM_CANCELGRANT) { + /* If we got this, then the ast was fired + * before we could cancel. We cleanup our + * state, and restart the function. */ + spin_lock(&lockres->l_lock); + lockres->l_flags &= ~USER_LOCK_IN_CANCEL; + spin_unlock(&lockres->l_lock); + } else if (status != DLM_NORMAL) + user_log_dlm_error("dlmunlock", status, lockres); + goto drop_ref; + } + + /* If there are still incompat holders, we can exit safely + * without worrying about re-queueing this lock as that will + * happen on the last call to user_cluster_unlock. */ + if ((lockres->l_blocking == LKM_EXMODE) + && (lockres->l_ex_holders || lockres->l_ro_holders)) { + spin_unlock(&lockres->l_lock); + mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n", + lockres->l_ro_holders, lockres->l_ex_holders); + goto drop_ref; + } + + if ((lockres->l_blocking == LKM_PRMODE) + && lockres->l_ex_holders) { + spin_unlock(&lockres->l_lock); + mlog(0, "can't downconvert for pr: ex = %u\n", + lockres->l_ex_holders); + goto drop_ref; + } + + /* yay, we can downconvert now. */ + new_level = user_highest_compat_lock_level(lockres->l_blocking); + lockres->l_requested = new_level; + lockres->l_flags |= USER_LOCK_BUSY; + mlog(0, "Downconvert lock from %d to %d\n", + lockres->l_level, new_level); + spin_unlock(&lockres->l_lock); + + /* need lock downconvert request now... */ + status = dlmlock(dlm, + new_level, + &lockres->l_lksb, + LKM_CONVERT|LKM_VALBLK, + lockres->l_name, + user_ast, + lockres, + user_bast); + if (status != DLM_NORMAL) { + user_log_dlm_error("dlmlock", status, lockres); + user_recover_from_dlm_error(lockres); + } + +drop_ref: + user_dlm_drop_inode_ref(lockres); +} + +static inline void user_dlm_inc_holders(struct user_lock_res *lockres, + int level) +{ + switch(level) { + case LKM_EXMODE: + lockres->l_ex_holders++; + break; + case LKM_PRMODE: + lockres->l_ro_holders++; + break; + default: + BUG(); + } +} + +/* predict what lock level we'll be dropping down to on behalf + * of another node, and return true if the currently wanted + * level will be compatible with it. */ +static inline int +user_may_continue_on_blocked_lock(struct user_lock_res *lockres, + int wanted) +{ + BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED)); + + return wanted <= user_highest_compat_lock_level(lockres->l_blocking); +} + +int user_dlm_cluster_lock(struct user_lock_res *lockres, + int level, + int lkm_flags) +{ + int status, local_flags; + struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); + + if (level != LKM_EXMODE && + level != LKM_PRMODE) { + mlog(ML_ERROR, "lockres %s: invalid request!\n", + lockres->l_name); + status = -EINVAL; + goto bail; + } + + mlog(0, "lockres %s: asking for %s lock, passed flags = 0x%x\n", + lockres->l_name, + (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE", + lkm_flags); + +again: + if (signal_pending(current)) { + status = -ERESTARTSYS; + goto bail; + } + + spin_lock(&lockres->l_lock); + + /* We only compare against the currently granted level + * here. If the lock is blocked waiting on a downconvert, + * we'll get caught below. */ + if ((lockres->l_flags & USER_LOCK_BUSY) && + (level > lockres->l_level)) { + /* is someone sitting in dlm_lock? If so, wait on + * them. */ + spin_unlock(&lockres->l_lock); + + user_wait_on_busy_lock(lockres); + goto again; + } + + if ((lockres->l_flags & USER_LOCK_BLOCKED) && + (!user_may_continue_on_blocked_lock(lockres, level))) { + /* is the lock is currently blocked on behalf of + * another node */ + spin_unlock(&lockres->l_lock); + + user_wait_on_blocked_lock(lockres); + goto again; + } + + if (level > lockres->l_level) { + local_flags = lkm_flags | LKM_VALBLK; + if (lockres->l_level != LKM_IVMODE) + local_flags |= LKM_CONVERT; + + lockres->l_requested = level; + lockres->l_flags |= USER_LOCK_BUSY; + spin_unlock(&lockres->l_lock); + + BUG_ON(level == LKM_IVMODE); + BUG_ON(level == LKM_NLMODE); + + mlog(0, "lock %s, get lock from %d to level = %d\n", + lockres->l_name, lockres->l_level, level); + + /* call dlm_lock to upgrade lock now */ + status = dlmlock(dlm, + level, + &lockres->l_lksb, + local_flags, + lockres->l_name, + user_ast, + lockres, + user_bast); + if (status != DLM_NORMAL) { + if ((lkm_flags & LKM_NOQUEUE) && + (status == DLM_NOTQUEUED)) + status = -EAGAIN; + else { + user_log_dlm_error("dlmlock", status, lockres); + status = -EINVAL; + } + user_recover_from_dlm_error(lockres); + goto bail; + } + + mlog(0, "lock %s, successfull return from dlmlock\n", + lockres->l_name); + + user_wait_on_busy_lock(lockres); + goto again; + } + + user_dlm_inc_holders(lockres, level); + spin_unlock(&lockres->l_lock); + + mlog(0, "lockres %s: Got %s lock!\n", lockres->l_name, + (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE"); + + status = 0; +bail: + return status; +} + +static inline void user_dlm_dec_holders(struct user_lock_res *lockres, + int level) +{ + switch(level) { + case LKM_EXMODE: + BUG_ON(!lockres->l_ex_holders); + lockres->l_ex_holders--; + break; + case LKM_PRMODE: + BUG_ON(!lockres->l_ro_holders); + lockres->l_ro_holders--; + break; + default: + BUG(); + } +} + +void user_dlm_cluster_unlock(struct user_lock_res *lockres, + int level) +{ + if (level != LKM_EXMODE && + level != LKM_PRMODE) { + mlog(ML_ERROR, "lockres %s: invalid request!\n", lockres->l_name); + return; + } + + mlog(0, "lockres %s: dropping %s lock\n", lockres->l_name, + (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE"); + + spin_lock(&lockres->l_lock); + user_dlm_dec_holders(lockres, level); + __user_dlm_cond_queue_lockres(lockres); + spin_unlock(&lockres->l_lock); +} + +void user_dlm_write_lvb(struct inode *inode, + const char *val, + unsigned int len) +{ + struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres; + char *lvb = lockres->l_lksb.lvb; + + BUG_ON(len > DLM_LVB_LEN); + + spin_lock(&lockres->l_lock); + + BUG_ON(lockres->l_level < LKM_EXMODE); + memcpy(lvb, val, len); + + spin_unlock(&lockres->l_lock); +} + +void user_dlm_read_lvb(struct inode *inode, + char *val, + unsigned int len) +{ + struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres; + char *lvb = lockres->l_lksb.lvb; + + BUG_ON(len > DLM_LVB_LEN); + + spin_lock(&lockres->l_lock); + + BUG_ON(lockres->l_level < LKM_PRMODE); + memcpy(val, lvb, len); + + spin_unlock(&lockres->l_lock); +} + +void user_dlm_lock_res_init(struct user_lock_res *lockres, + struct dentry *dentry) +{ + memset(lockres, 0, sizeof(*lockres)); + + spin_lock_init(&lockres->l_lock); + init_waitqueue_head(&lockres->l_event); + lockres->l_level = LKM_IVMODE; + lockres->l_requested = LKM_IVMODE; + lockres->l_blocking = LKM_IVMODE; + + /* should have been checked before getting here. */ + BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN); + + memcpy(lockres->l_name, + dentry->d_name.name, + dentry->d_name.len); +} + +int user_dlm_destroy_lock(struct user_lock_res *lockres) +{ + int status = -EBUSY; + struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); + + mlog(0, "asked to destroy %s\n", lockres->l_name); + + spin_lock(&lockres->l_lock); + while (lockres->l_flags & USER_LOCK_BUSY) { + spin_unlock(&lockres->l_lock); + + mlog(0, "lock %s is busy\n", lockres->l_name); + + user_wait_on_busy_lock(lockres); + + spin_lock(&lockres->l_lock); + } + + if (lockres->l_ro_holders || lockres->l_ex_holders) { + spin_unlock(&lockres->l_lock); + mlog(0, "lock %s has holders\n", lockres->l_name); + goto bail; + } + + status = 0; + if (!(lockres->l_flags & USER_LOCK_ATTACHED)) { + spin_unlock(&lockres->l_lock); + mlog(0, "lock %s is not attached\n", lockres->l_name); + goto bail; + } + + lockres->l_flags &= ~USER_LOCK_ATTACHED; + lockres->l_flags |= USER_LOCK_BUSY; + lockres->l_flags |= USER_LOCK_IN_TEARDOWN; + spin_unlock(&lockres->l_lock); + + mlog(0, "unlocking lockres %s\n", lockres->l_name); + status = dlmunlock(dlm, + &lockres->l_lksb, + LKM_VALBLK, + user_unlock_ast, + lockres); + if (status != DLM_NORMAL) { + user_log_dlm_error("dlmunlock", status, lockres); + status = -EINVAL; + goto bail; + } + + user_wait_on_busy_lock(lockres); + + status = 0; +bail: + return status; +} + +struct dlm_ctxt *user_dlm_register_context(struct qstr *name) +{ + struct dlm_ctxt *dlm; + u32 dlm_key; + char *domain; + + domain = kmalloc(name->len + 1, GFP_KERNEL); + if (!domain) { + mlog_errno(-ENOMEM); + return ERR_PTR(-ENOMEM); + } + + dlm_key = crc32_le(0, name->name, name->len); + + snprintf(domain, name->len + 1, "%.*s", name->len, name->name); + + dlm = dlm_register_domain(domain, dlm_key); + if (IS_ERR(dlm)) + mlog_errno(PTR_ERR(dlm)); + + kfree(domain); + return dlm; +} + +void user_dlm_unregister_context(struct dlm_ctxt *dlm) +{ + dlm_unregister_domain(dlm); +} diff --git a/fs/ocfs2/dlm/userdlm.h b/fs/ocfs2/dlm/userdlm.h new file mode 100644 index 0000000..04178bc --- /dev/null +++ b/fs/ocfs2/dlm/userdlm.h @@ -0,0 +1,111 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * userdlm.h + * + * Userspace dlm defines + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + + +#ifndef USERDLM_H +#define USERDLM_H + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +/* user_lock_res->l_flags flags. */ +#define USER_LOCK_ATTACHED (0x00000001) /* have we initialized + * the lvb */ +#define USER_LOCK_BUSY (0x00000002) /* we are currently in + * dlm_lock */ +#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to + * downconvert*/ +#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently + * destroying this + * lock. */ +#define USER_LOCK_QUEUED (0x00000010) /* lock is on the + * workqueue */ +#define USER_LOCK_IN_CANCEL (0x00000020) + +struct user_lock_res { + spinlock_t l_lock; + + int l_flags; + +#define USER_DLM_LOCK_ID_MAX_LEN 32 + char l_name[USER_DLM_LOCK_ID_MAX_LEN]; + int l_level; + unsigned int l_ro_holders; + unsigned int l_ex_holders; + struct dlm_lockstatus l_lksb; + + int l_requested; + int l_blocking; + + wait_queue_head_t l_event; + + struct work_struct l_work; +}; + +extern struct workqueue_struct *user_dlm_worker; + +void user_dlm_lock_res_init(struct user_lock_res *lockres, + struct dentry *dentry); +int user_dlm_destroy_lock(struct user_lock_res *lockres); +int user_dlm_cluster_lock(struct user_lock_res *lockres, + int level, + int lkm_flags); +void user_dlm_cluster_unlock(struct user_lock_res *lockres, + int level); +void user_dlm_write_lvb(struct inode *inode, + const char *val, + unsigned int len); +void user_dlm_read_lvb(struct inode *inode, + char *val, + unsigned int len); +struct dlm_ctxt *user_dlm_register_context(struct qstr *name); +void user_dlm_unregister_context(struct dlm_ctxt *dlm); + +struct dlmfs_inode_private { + struct dlm_ctxt *ip_dlm; + + struct user_lock_res ip_lockres; /* unused for directories. */ + struct inode *ip_parent; + + struct inode ip_vfs_inode; +}; + +static inline struct dlmfs_inode_private * +DLMFS_I(struct inode *inode) +{ + return container_of(inode, + struct dlmfs_inode_private, + ip_vfs_inode); +} + +struct dlmfs_filp_private { + int fp_lock_level; +}; + +#define DLMFS_MAGIC 0x76a9f425 + +#endif /* USERDLM_H */ diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c new file mode 100644 index 0000000..e971ec2 --- /dev/null +++ b/fs/ocfs2/dlmglue.c @@ -0,0 +1,2904 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmglue.c + * + * Code which implements an OCFS2 specific interface to our DLM. + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/mm.h> +#include <linux/smp_lock.h> +#include <linux/crc32.h> +#include <linux/kthread.h> +#include <linux/pagemap.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +#include <cluster/heartbeat.h> +#include <cluster/nodemanager.h> +#include <cluster/tcp.h> + +#include <dlm/dlmapi.h> + +#define MLOG_MASK_PREFIX ML_DLM_GLUE +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "heartbeat.h" +#include "inode.h" +#include "journal.h" +#include "slot_map.h" +#include "super.h" +#include "uptodate.h" +#include "vote.h" + +#include "buffer_head_io.h" + +struct ocfs2_mask_waiter { + struct list_head mw_item; + int mw_status; + struct completion mw_complete; + unsigned long mw_mask; + unsigned long mw_goal; +}; + +static void ocfs2_inode_ast_func(void *opaque); +static void ocfs2_inode_bast_func(void *opaque, + int level); +static void ocfs2_super_ast_func(void *opaque); +static void ocfs2_super_bast_func(void *opaque, + int level); +static void ocfs2_rename_ast_func(void *opaque); +static void ocfs2_rename_bast_func(void *opaque, + int level); + +/* so far, all locks have gotten along with the same unlock ast */ +static void ocfs2_unlock_ast_func(void *opaque, + enum dlm_status status); +static int ocfs2_do_unblock_meta(struct inode *inode, + int *requeue); +static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, + int *requeue); +static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, + int *requeue); +static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, + int *requeue); +static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, + int *requeue); +typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); +static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int *requeue, + ocfs2_convert_worker_t *worker); + +struct ocfs2_lock_res_ops { + void (*ast)(void *); + void (*bast)(void *, int); + void (*unlock_ast)(void *, enum dlm_status); + int (*unblock)(struct ocfs2_lock_res *, int *); +}; + +static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { + .ast = ocfs2_inode_ast_func, + .bast = ocfs2_inode_bast_func, + .unlock_ast = ocfs2_unlock_ast_func, + .unblock = ocfs2_unblock_inode_lock, +}; + +static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { + .ast = ocfs2_inode_ast_func, + .bast = ocfs2_inode_bast_func, + .unlock_ast = ocfs2_unlock_ast_func, + .unblock = ocfs2_unblock_meta, +}; + +static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, + int blocking); + +static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { + .ast = ocfs2_inode_ast_func, + .bast = ocfs2_inode_bast_func, + .unlock_ast = ocfs2_unlock_ast_func, + .unblock = ocfs2_unblock_data, +}; + +static struct ocfs2_lock_res_ops ocfs2_super_lops = { + .ast = ocfs2_super_ast_func, + .bast = ocfs2_super_bast_func, + .unlock_ast = ocfs2_unlock_ast_func, + .unblock = ocfs2_unblock_osb_lock, +}; + +static struct ocfs2_lock_res_ops ocfs2_rename_lops = { + .ast = ocfs2_rename_ast_func, + .bast = ocfs2_rename_bast_func, + .unlock_ast = ocfs2_unlock_ast_func, + .unblock = ocfs2_unblock_osb_lock, +}; + +static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) +{ + return lockres->l_type == OCFS2_LOCK_TYPE_META || + lockres->l_type == OCFS2_LOCK_TYPE_DATA || + lockres->l_type == OCFS2_LOCK_TYPE_RW; +} + +static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres) +{ + return lockres->l_type == OCFS2_LOCK_TYPE_SUPER; +} + +static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres) +{ + return lockres->l_type == OCFS2_LOCK_TYPE_RENAME; +} + +static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres) +{ + BUG_ON(!ocfs2_is_super_lock(lockres) + && !ocfs2_is_rename_lock(lockres)); + + return (struct ocfs2_super *) lockres->l_priv; +} + +static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) +{ + BUG_ON(!ocfs2_is_inode_lock(lockres)); + + return (struct inode *) lockres->l_priv; +} + +static int ocfs2_lock_create(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level, + int dlm_flags); +static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, + int wanted); +static void ocfs2_cluster_unlock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level); +static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); +static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); +static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); +static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); +static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres); +static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, + int convert); +#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ + mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ + "resource %s: %s\n", dlm_errname(_stat), _func, \ + _lockres->l_name, dlm_errmsg(_stat)); \ +} while (0) +static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres); +static int ocfs2_meta_lock_update(struct inode *inode, + struct buffer_head **bh); +static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); +static inline int ocfs2_highest_compat_lock_level(int level); +static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, + struct ocfs2_lock_res *lockres, + int new_level); + +static char *ocfs2_lock_type_strings[] = { + [OCFS2_LOCK_TYPE_META] = "Meta", + [OCFS2_LOCK_TYPE_DATA] = "Data", + [OCFS2_LOCK_TYPE_SUPER] = "Super", + [OCFS2_LOCK_TYPE_RENAME] = "Rename", + /* Need to differntiate from [R]ename.. serializing writes is the + * important job it does, anyway. */ + [OCFS2_LOCK_TYPE_RW] = "Write/Read", +}; + +static char *ocfs2_lock_type_string(enum ocfs2_lock_type type) +{ + mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type); + return ocfs2_lock_type_strings[type]; +} + +static void ocfs2_build_lock_name(enum ocfs2_lock_type type, + u64 blkno, + u32 generation, + char *name) +{ + int len; + + mlog_entry_void(); + + BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); + + len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016"MLFx64"%08x", + ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, blkno, + generation); + + BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); + + mlog(0, "built lock resource with name: %s\n", name); + + mlog_exit_void(); +} + +static spinlock_t ocfs2_dlm_tracking_lock = SPIN_LOCK_UNLOCKED; + +static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, + struct ocfs2_dlm_debug *dlm_debug) +{ + mlog(0, "Add tracking for lockres %s\n", res->l_name); + + spin_lock(&ocfs2_dlm_tracking_lock); + list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); + spin_unlock(&ocfs2_dlm_tracking_lock); +} + +static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) +{ + spin_lock(&ocfs2_dlm_tracking_lock); + if (!list_empty(&res->l_debug_list)) + list_del_init(&res->l_debug_list); + spin_unlock(&ocfs2_dlm_tracking_lock); +} + +static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, + struct ocfs2_lock_res *res, + enum ocfs2_lock_type type, + u64 blkno, + u32 generation, + struct ocfs2_lock_res_ops *ops, + void *priv) +{ + ocfs2_build_lock_name(type, blkno, generation, res->l_name); + + res->l_type = type; + res->l_ops = ops; + res->l_priv = priv; + + res->l_level = LKM_IVMODE; + res->l_requested = LKM_IVMODE; + res->l_blocking = LKM_IVMODE; + res->l_action = OCFS2_AST_INVALID; + res->l_unlock_action = OCFS2_UNLOCK_INVALID; + + res->l_flags = OCFS2_LOCK_INITIALIZED; + + ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); +} + +void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) +{ + /* This also clears out the lock status block */ + memset(res, 0, sizeof(struct ocfs2_lock_res)); + spin_lock_init(&res->l_lock); + init_waitqueue_head(&res->l_event); + INIT_LIST_HEAD(&res->l_blocked_list); + INIT_LIST_HEAD(&res->l_mask_waiters); +} + +void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, + enum ocfs2_lock_type type, + struct inode *inode) +{ + struct ocfs2_lock_res_ops *ops; + + switch(type) { + case OCFS2_LOCK_TYPE_RW: + ops = &ocfs2_inode_rw_lops; + break; + case OCFS2_LOCK_TYPE_META: + ops = &ocfs2_inode_meta_lops; + break; + case OCFS2_LOCK_TYPE_DATA: + ops = &ocfs2_inode_data_lops; + break; + default: + mlog_bug_on_msg(1, "type: %d\n", type); + ops = NULL; /* thanks, gcc */ + break; + }; + + ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, + OCFS2_I(inode)->ip_blkno, + inode->i_generation, ops, inode); +} + +static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, + struct ocfs2_super *osb) +{ + /* Superblock lockres doesn't come from a slab so we call init + * once on it manually. */ + ocfs2_lock_res_init_once(res); + ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, + OCFS2_SUPER_BLOCK_BLKNO, 0, + &ocfs2_super_lops, osb); +} + +static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, + struct ocfs2_super *osb) +{ + /* Rename lockres doesn't come from a slab so we call init + * once on it manually. */ + ocfs2_lock_res_init_once(res); + ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0, + &ocfs2_rename_lops, osb); +} + +void ocfs2_lock_res_free(struct ocfs2_lock_res *res) +{ + mlog_entry_void(); + + if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) + return; + + ocfs2_remove_lockres_tracking(res); + + mlog_bug_on_msg(!list_empty(&res->l_blocked_list), + "Lockres %s is on the blocked list\n", + res->l_name); + mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), + "Lockres %s has mask waiters pending\n", + res->l_name); + mlog_bug_on_msg(spin_is_locked(&res->l_lock), + "Lockres %s is locked\n", + res->l_name); + mlog_bug_on_msg(res->l_ro_holders, + "Lockres %s has %u ro holders\n", + res->l_name, res->l_ro_holders); + mlog_bug_on_msg(res->l_ex_holders, + "Lockres %s has %u ex holders\n", + res->l_name, res->l_ex_holders); + + /* Need to clear out the lock status block for the dlm */ + memset(&res->l_lksb, 0, sizeof(res->l_lksb)); + + res->l_flags = 0UL; + mlog_exit_void(); +} + +static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, + int level) +{ + mlog_entry_void(); + + BUG_ON(!lockres); + + switch(level) { + case LKM_EXMODE: + lockres->l_ex_holders++; + break; + case LKM_PRMODE: + lockres->l_ro_holders++; + break; + default: + BUG(); + } + + mlog_exit_void(); +} + +static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, + int level) +{ + mlog_entry_void(); + + BUG_ON(!lockres); + + switch(level) { + case LKM_EXMODE: + BUG_ON(!lockres->l_ex_holders); + lockres->l_ex_holders--; + break; + case LKM_PRMODE: + BUG_ON(!lockres->l_ro_holders); + lockres->l_ro_holders--; + break; + default: + BUG(); + } + mlog_exit_void(); +} + +/* WARNING: This function lives in a world where the only three lock + * levels are EX, PR, and NL. It *will* have to be adjusted when more + * lock types are added. */ +static inline int ocfs2_highest_compat_lock_level(int level) +{ + int new_level = LKM_EXMODE; + + if (level == LKM_EXMODE) + new_level = LKM_NLMODE; + else if (level == LKM_PRMODE) + new_level = LKM_PRMODE; + return new_level; +} + +static void lockres_set_flags(struct ocfs2_lock_res *lockres, + unsigned long newflags) +{ + struct list_head *pos, *tmp; + struct ocfs2_mask_waiter *mw; + + assert_spin_locked(&lockres->l_lock); + + lockres->l_flags = newflags; + + list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { + mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); + if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) + continue; + + list_del_init(&mw->mw_item); + mw->mw_status = 0; + complete(&mw->mw_complete); + } +} +static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) +{ + lockres_set_flags(lockres, lockres->l_flags | or); +} +static void lockres_clear_flags(struct ocfs2_lock_res *lockres, + unsigned long clear) +{ + lockres_set_flags(lockres, lockres->l_flags & ~clear); +} + +static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) +{ + mlog_entry_void(); + + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); + BUG_ON(lockres->l_blocking <= LKM_NLMODE); + + lockres->l_level = lockres->l_requested; + if (lockres->l_level <= + ocfs2_highest_compat_lock_level(lockres->l_blocking)) { + lockres->l_blocking = LKM_NLMODE; + lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); + } + lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); + + mlog_exit_void(); +} + +static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) +{ + mlog_entry_void(); + + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); + + /* Convert from RO to EX doesn't really need anything as our + * information is already up to data. Convert from NL to + * *anything* however should mark ourselves as needing an + * update */ + if (lockres->l_level == LKM_NLMODE) + lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); + + lockres->l_level = lockres->l_requested; + lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); + + mlog_exit_void(); +} + +static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) +{ + mlog_entry_void(); + + BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); + BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); + + if (lockres->l_requested > LKM_NLMODE && + !(lockres->l_flags & OCFS2_LOCK_LOCAL)) + lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); + + lockres->l_level = lockres->l_requested; + lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); + lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); + + mlog_exit_void(); +} + +static void ocfs2_inode_ast_func(void *opaque) +{ + struct ocfs2_lock_res *lockres = opaque; + struct inode *inode; + struct dlm_lockstatus *lksb; + unsigned long flags; + + mlog_entry_void(); + + inode = ocfs2_lock_res_inode(lockres); + + mlog(0, "AST fired for inode %"MLFu64", l_action = %u, type = %s\n", + OCFS2_I(inode)->ip_blkno, lockres->l_action, + ocfs2_lock_type_string(lockres->l_type)); + + BUG_ON(!ocfs2_is_inode_lock(lockres)); + + spin_lock_irqsave(&lockres->l_lock, flags); + + lksb = &(lockres->l_lksb); + if (lksb->status != DLM_NORMAL) { + mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u " + "on inode %"MLFu64"\n", lksb->status, + OCFS2_I(inode)->ip_blkno); + spin_unlock_irqrestore(&lockres->l_lock, flags); + mlog_exit_void(); + return; + } + + switch(lockres->l_action) { + case OCFS2_AST_ATTACH: + ocfs2_generic_handle_attach_action(lockres); + lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); + break; + case OCFS2_AST_CONVERT: + ocfs2_generic_handle_convert_action(lockres); + break; + case OCFS2_AST_DOWNCONVERT: + ocfs2_generic_handle_downconvert_action(lockres); + break; + default: + mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " + "lockres flags = 0x%lx, unlock action: %u\n", + lockres->l_name, lockres->l_action, lockres->l_flags, + lockres->l_unlock_action); + + BUG(); + } + + /* data and rw locking ignores refresh flag for now. */ + if (lockres->l_type != OCFS2_LOCK_TYPE_META) + lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); + + /* set it to something invalid so if we get called again we + * can catch it. */ + lockres->l_action = OCFS2_AST_INVALID; + spin_unlock_irqrestore(&lockres->l_lock, flags); + wake_up(&lockres->l_event); + + mlog_exit_void(); +} + +static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, + int level) +{ + int needs_downconvert = 0; + mlog_entry_void(); + + assert_spin_locked(&lockres->l_lock); + + lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); + + if (level > lockres->l_blocking) { + /* only schedule a downconvert if we haven't already scheduled + * one that goes low enough to satisfy the level we're + * blocking. this also catches the case where we get + * duplicate BASTs */ + if (ocfs2_highest_compat_lock_level(level) < + ocfs2_highest_compat_lock_level(lockres->l_blocking)) + needs_downconvert = 1; + + lockres->l_blocking = level; + } + + mlog_exit(needs_downconvert); + return needs_downconvert; +} + +static void ocfs2_generic_bast_func(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level) +{ + int needs_downconvert; + unsigned long flags; + + mlog_entry_void(); + + BUG_ON(level <= LKM_NLMODE); + + spin_lock_irqsave(&lockres->l_lock, flags); + needs_downconvert = ocfs2_generic_handle_bast(lockres, level); + if (needs_downconvert) + ocfs2_schedule_blocked_lock(osb, lockres); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + ocfs2_kick_vote_thread(osb); + + wake_up(&lockres->l_event); + mlog_exit_void(); +} + +static void ocfs2_inode_bast_func(void *opaque, int level) +{ + struct ocfs2_lock_res *lockres = opaque; + struct inode *inode; + struct ocfs2_super *osb; + + mlog_entry_void(); + + BUG_ON(!ocfs2_is_inode_lock(lockres)); + + inode = ocfs2_lock_res_inode(lockres); + osb = OCFS2_SB(inode->i_sb); + + mlog(0, "BAST fired for inode %"MLFu64", blocking = %d, level = %d " + "type = %s\n", OCFS2_I(inode)->ip_blkno, level, + lockres->l_level, + ocfs2_lock_type_string(lockres->l_type)); + + ocfs2_generic_bast_func(osb, lockres, level); + + mlog_exit_void(); +} + +static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres, + int ignore_refresh) +{ + struct dlm_lockstatus *lksb = &lockres->l_lksb; + unsigned long flags; + + spin_lock_irqsave(&lockres->l_lock, flags); + + if (lksb->status != DLM_NORMAL) { + mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", + lockres->l_name, lksb->status); + spin_unlock_irqrestore(&lockres->l_lock, flags); + return; + } + + switch(lockres->l_action) { + case OCFS2_AST_ATTACH: + ocfs2_generic_handle_attach_action(lockres); + break; + case OCFS2_AST_CONVERT: + ocfs2_generic_handle_convert_action(lockres); + break; + case OCFS2_AST_DOWNCONVERT: + ocfs2_generic_handle_downconvert_action(lockres); + break; + default: + BUG(); + } + + if (ignore_refresh) + lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); + + /* set it to something invalid so if we get called again we + * can catch it. */ + lockres->l_action = OCFS2_AST_INVALID; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + wake_up(&lockres->l_event); +} + +static void ocfs2_super_ast_func(void *opaque) +{ + struct ocfs2_lock_res *lockres = opaque; + + mlog_entry_void(); + mlog(0, "Superblock AST fired\n"); + + BUG_ON(!ocfs2_is_super_lock(lockres)); + ocfs2_generic_ast_func(lockres, 0); + + mlog_exit_void(); +} + +static void ocfs2_super_bast_func(void *opaque, + int level) +{ + struct ocfs2_lock_res *lockres = opaque; + struct ocfs2_super *osb; + + mlog_entry_void(); + mlog(0, "Superblock BAST fired\n"); + + BUG_ON(!ocfs2_is_super_lock(lockres)); + osb = ocfs2_lock_res_super(lockres); + ocfs2_generic_bast_func(osb, lockres, level); + + mlog_exit_void(); +} + +static void ocfs2_rename_ast_func(void *opaque) +{ + struct ocfs2_lock_res *lockres = opaque; + + mlog_entry_void(); + + mlog(0, "Rename AST fired\n"); + + BUG_ON(!ocfs2_is_rename_lock(lockres)); + + ocfs2_generic_ast_func(lockres, 1); + + mlog_exit_void(); +} + +static void ocfs2_rename_bast_func(void *opaque, + int level) +{ + struct ocfs2_lock_res *lockres = opaque; + struct ocfs2_super *osb; + + mlog_entry_void(); + + mlog(0, "Rename BAST fired\n"); + + BUG_ON(!ocfs2_is_rename_lock(lockres)); + + osb = ocfs2_lock_res_super(lockres); + ocfs2_generic_bast_func(osb, lockres, level); + + mlog_exit_void(); +} + +static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, + int convert) +{ + unsigned long flags; + + mlog_entry_void(); + spin_lock_irqsave(&lockres->l_lock, flags); + lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); + if (convert) + lockres->l_action = OCFS2_AST_INVALID; + else + lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + wake_up(&lockres->l_event); + mlog_exit_void(); +} + +/* Note: If we detect another process working on the lock (i.e., + * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller + * to do the right thing in that case. + */ +static int ocfs2_lock_create(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level, + int dlm_flags) +{ + int ret = 0; + enum dlm_status status; + unsigned long flags; + + mlog_entry_void(); + + mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, + dlm_flags); + + spin_lock_irqsave(&lockres->l_lock, flags); + if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || + (lockres->l_flags & OCFS2_LOCK_BUSY)) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + goto bail; + } + + lockres->l_action = OCFS2_AST_ATTACH; + lockres->l_requested = level; + lockres_or_flags(lockres, OCFS2_LOCK_BUSY); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + status = dlmlock(osb->dlm, + level, + &lockres->l_lksb, + dlm_flags, + lockres->l_name, + lockres->l_ops->ast, + lockres, + lockres->l_ops->bast); + if (status != DLM_NORMAL) { + ocfs2_log_dlm_error("dlmlock", status, lockres); + ret = -EINVAL; + ocfs2_recover_from_dlm_error(lockres, 1); + } + + mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); + +bail: + mlog_exit(ret); + return ret; +} + +static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, + int flag) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&lockres->l_lock, flags); + ret = lockres->l_flags & flag; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + return ret; +} + +static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) + +{ + wait_event(lockres->l_event, + !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); +} + +static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) + +{ + wait_event(lockres->l_event, + !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); +} + +/* predict what lock level we'll be dropping down to on behalf + * of another node, and return true if the currently wanted + * level will be compatible with it. */ +static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, + int wanted) +{ + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); + + return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); +} + +static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) +{ + INIT_LIST_HEAD(&mw->mw_item); + init_completion(&mw->mw_complete); +} + +static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) +{ + wait_for_completion(&mw->mw_complete); + /* Re-arm the completion in case we want to wait on it again */ + INIT_COMPLETION(mw->mw_complete); + return mw->mw_status; +} + +static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, + struct ocfs2_mask_waiter *mw, + unsigned long mask, + unsigned long goal) +{ + BUG_ON(!list_empty(&mw->mw_item)); + + assert_spin_locked(&lockres->l_lock); + + list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); + mw->mw_mask = mask; + mw->mw_goal = goal; +} + +/* returns 0 if the mw that was removed was already satisfied, -EBUSY + * if the mask still hadn't reached its goal */ +static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, + struct ocfs2_mask_waiter *mw) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&lockres->l_lock, flags); + if (!list_empty(&mw->mw_item)) { + if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) + ret = -EBUSY; + + list_del_init(&mw->mw_item); + init_completion(&mw->mw_complete); + } + spin_unlock_irqrestore(&lockres->l_lock, flags); + + return ret; + +} + +static int ocfs2_cluster_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level, + int lkm_flags, + int arg_flags) +{ + struct ocfs2_mask_waiter mw; + enum dlm_status status; + int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); + int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ + unsigned long flags; + + mlog_entry_void(); + + ocfs2_init_mask_waiter(&mw); + +again: + wait = 0; + + if (catch_signals && signal_pending(current)) { + ret = -ERESTARTSYS; + goto out; + } + + spin_lock_irqsave(&lockres->l_lock, flags); + + mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, + "Cluster lock called on freeing lockres %s! flags " + "0x%lx\n", lockres->l_name, lockres->l_flags); + + /* We only compare against the currently granted level + * here. If the lock is blocked waiting on a downconvert, + * we'll get caught below. */ + if (lockres->l_flags & OCFS2_LOCK_BUSY && + level > lockres->l_level) { + /* is someone sitting in dlm_lock? If so, wait on + * them. */ + lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); + wait = 1; + goto unlock; + } + + if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { + /* lock has not been created yet. */ + spin_unlock_irqrestore(&lockres->l_lock, flags); + + ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + goto again; + } + + if (lockres->l_flags & OCFS2_LOCK_BLOCKED && + !ocfs2_may_continue_on_blocked_lock(lockres, level)) { + /* is the lock is currently blocked on behalf of + * another node */ + lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); + wait = 1; + goto unlock; + } + + if (level > lockres->l_level) { + if (lockres->l_action != OCFS2_AST_INVALID) + mlog(ML_ERROR, "lockres %s has action %u pending\n", + lockres->l_name, lockres->l_action); + + lockres->l_action = OCFS2_AST_CONVERT; + lockres->l_requested = level; + lockres_or_flags(lockres, OCFS2_LOCK_BUSY); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + BUG_ON(level == LKM_IVMODE); + BUG_ON(level == LKM_NLMODE); + + mlog(0, "lock %s, convert from %d to level = %d\n", + lockres->l_name, lockres->l_level, level); + + /* call dlm_lock to upgrade lock now */ + status = dlmlock(osb->dlm, + level, + &lockres->l_lksb, + lkm_flags|LKM_CONVERT|LKM_VALBLK, + lockres->l_name, + lockres->l_ops->ast, + lockres, + lockres->l_ops->bast); + if (status != DLM_NORMAL) { + if ((lkm_flags & LKM_NOQUEUE) && + (status == DLM_NOTQUEUED)) + ret = -EAGAIN; + else { + ocfs2_log_dlm_error("dlmlock", status, + lockres); + ret = -EINVAL; + } + ocfs2_recover_from_dlm_error(lockres, 1); + goto out; + } + + mlog(0, "lock %s, successfull return from dlmlock\n", + lockres->l_name); + + /* At this point we've gone inside the dlm and need to + * complete our work regardless. */ + catch_signals = 0; + + /* wait for busy to clear and carry on */ + goto again; + } + + /* Ok, if we get here then we're good to go. */ + ocfs2_inc_holders(lockres, level); + + ret = 0; +unlock: + spin_unlock_irqrestore(&lockres->l_lock, flags); +out: + /* + * This is helping work around a lock inversion between the page lock + * and dlm locks. One path holds the page lock while calling aops + * which block acquiring dlm locks. The voting thread holds dlm + * locks while acquiring page locks while down converting data locks. + * This block is helping an aop path notice the inversion and back + * off to unlock its page lock before trying the dlm lock again. + */ + if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && + mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { + wait = 0; + if (lockres_remove_mask_waiter(lockres, &mw)) + ret = -EAGAIN; + else + goto again; + } + if (wait) { + ret = ocfs2_wait_for_mask(&mw); + if (ret == 0) + goto again; + mlog_errno(ret); + } + + mlog_exit(ret); + return ret; +} + +static void ocfs2_cluster_unlock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int level) +{ + unsigned long flags; + + mlog_entry_void(); + spin_lock_irqsave(&lockres->l_lock, flags); + ocfs2_dec_holders(lockres, level); + ocfs2_vote_on_unlock(osb, lockres); + spin_unlock_irqrestore(&lockres->l_lock, flags); + mlog_exit_void(); +} + +static int ocfs2_create_new_inode_lock(struct inode *inode, + struct ocfs2_lock_res *lockres) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + unsigned long flags; + + spin_lock_irqsave(&lockres->l_lock, flags); + BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); + lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + return ocfs2_lock_create(osb, lockres, LKM_EXMODE, LKM_LOCAL); +} + +/* Grants us an EX lock on the data and metadata resources, skipping + * the normal cluster directory lookup. Use this ONLY on newly created + * inodes which other nodes can't possibly see, and which haven't been + * hashed in the inode hash yet. This can give us a good performance + * increase as it'll skip the network broadcast normally associated + * with creating a new lock resource. */ +int ocfs2_create_new_inode_locks(struct inode *inode) +{ + int ret; + + BUG_ON(!inode); + BUG_ON(!ocfs2_inode_is_new(inode)); + + mlog_entry_void(); + + mlog(0, "Inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + /* NOTE: That we don't increment any of the holder counts, nor + * do we add anything to a journal handle. Since this is + * supposed to be a new inode which the cluster doesn't know + * about yet, there is no need to. As far as the LVB handling + * is concerned, this is basically like acquiring an EX lock + * on a resource which has an invalid one -- we'll set it + * valid when we release the EX. */ + + ret = ocfs2_create_new_inode_lock(inode, + &OCFS2_I(inode)->ip_rw_lockres); + if (ret) { + mlog_errno(ret); + goto bail; + } + + ret = ocfs2_create_new_inode_lock(inode, + &OCFS2_I(inode)->ip_meta_lockres); + if (ret) { + mlog_errno(ret); + goto bail; + } + + ret = ocfs2_create_new_inode_lock(inode, + &OCFS2_I(inode)->ip_data_lockres); + if (ret) { + mlog_errno(ret); + goto bail; + } + +bail: + mlog_exit(ret); + return ret; +} + +int ocfs2_rw_lock(struct inode *inode, int write) +{ + int status, level; + struct ocfs2_lock_res *lockres; + + BUG_ON(!inode); + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64" take %s RW lock\n", + OCFS2_I(inode)->ip_blkno, + write ? "EXMODE" : "PRMODE"); + + lockres = &OCFS2_I(inode)->ip_rw_lockres; + + level = write ? LKM_EXMODE : LKM_PRMODE; + + status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, + 0); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); + return status; +} + +void ocfs2_rw_unlock(struct inode *inode, int write) +{ + int level = write ? LKM_EXMODE : LKM_PRMODE; + struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64" drop %s RW lock\n", + OCFS2_I(inode)->ip_blkno, + write ? "EXMODE" : "PRMODE"); + + ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); + + mlog_exit_void(); +} + +int ocfs2_data_lock_full(struct inode *inode, + int write, + int arg_flags) +{ + int status = 0, level; + struct ocfs2_lock_res *lockres; + + BUG_ON(!inode); + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64" take %s DATA lock\n", + OCFS2_I(inode)->ip_blkno, + write ? "EXMODE" : "PRMODE"); + + /* We'll allow faking a readonly data lock for + * rodevices. */ + if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { + if (write) { + status = -EROFS; + mlog_errno(status); + } + goto out; + } + + lockres = &OCFS2_I(inode)->ip_data_lockres; + + level = write ? LKM_EXMODE : LKM_PRMODE; + + status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, + 0, arg_flags); + if (status < 0 && status != -EAGAIN) + mlog_errno(status); + +out: + mlog_exit(status); + return status; +} + +/* see ocfs2_meta_lock_with_page() */ +int ocfs2_data_lock_with_page(struct inode *inode, + int write, + struct page *page) +{ + int ret; + + ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); + if (ret == -EAGAIN) { + unlock_page(page); + if (ocfs2_data_lock(inode, write) == 0) + ocfs2_data_unlock(inode, write); + ret = AOP_TRUNCATED_PAGE; + } + + return ret; +} + +static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres) +{ + int kick = 0; + + mlog_entry_void(); + + /* If we know that another node is waiting on our lock, kick + * the vote thread * pre-emptively when we reach a release + * condition. */ + if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { + switch(lockres->l_blocking) { + case LKM_EXMODE: + if (!lockres->l_ex_holders && !lockres->l_ro_holders) + kick = 1; + break; + case LKM_PRMODE: + if (!lockres->l_ex_holders) + kick = 1; + break; + default: + BUG(); + } + } + + if (kick) + ocfs2_kick_vote_thread(osb); + + mlog_exit_void(); +} + +void ocfs2_data_unlock(struct inode *inode, + int write) +{ + int level = write ? LKM_EXMODE : LKM_PRMODE; + struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64" drop %s DATA lock\n", + OCFS2_I(inode)->ip_blkno, + write ? "EXMODE" : "PRMODE"); + + if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) + ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); + + mlog_exit_void(); +} + +#define OCFS2_SEC_BITS 34 +#define OCFS2_SEC_SHIFT (64 - 34) +#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) + +/* LVB only has room for 64 bits of time here so we pack it for + * now. */ +static u64 ocfs2_pack_timespec(struct timespec *spec) +{ + u64 res; + u64 sec = spec->tv_sec; + u32 nsec = spec->tv_nsec; + + res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); + + return res; +} + +/* Call this with the lockres locked. I am reasonably sure we don't + * need ip_lock in this function as anyone who would be changing those + * values is supposed to be blocked in ocfs2_meta_lock right now. */ +static void __ocfs2_stuff_meta_lvb(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; + struct ocfs2_meta_lvb *lvb; + + mlog_entry_void(); + + lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; + + lvb->lvb_version = cpu_to_be32(OCFS2_LVB_VERSION); + lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); + lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); + lvb->lvb_iuid = cpu_to_be32(inode->i_uid); + lvb->lvb_igid = cpu_to_be32(inode->i_gid); + lvb->lvb_imode = cpu_to_be16(inode->i_mode); + lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); + lvb->lvb_iatime_packed = + cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); + lvb->lvb_ictime_packed = + cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); + lvb->lvb_imtime_packed = + cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); + + mlog_meta_lvb(0, lockres); + + mlog_exit_void(); +} + +static void ocfs2_unpack_timespec(struct timespec *spec, + u64 packed_time) +{ + spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; + spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; +} + +static void ocfs2_refresh_inode_from_lvb(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; + struct ocfs2_meta_lvb *lvb; + + mlog_entry_void(); + + mlog_meta_lvb(0, lockres); + + lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; + + /* We're safe here without the lockres lock... */ + spin_lock(&oi->ip_lock); + oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); + i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); + + /* fast-symlinks are a special case */ + if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) + inode->i_blocks = 0; + else + inode->i_blocks = + ocfs2_align_bytes_to_sectors(i_size_read(inode)); + + inode->i_uid = be32_to_cpu(lvb->lvb_iuid); + inode->i_gid = be32_to_cpu(lvb->lvb_igid); + inode->i_mode = be16_to_cpu(lvb->lvb_imode); + inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); + ocfs2_unpack_timespec(&inode->i_atime, + be64_to_cpu(lvb->lvb_iatime_packed)); + ocfs2_unpack_timespec(&inode->i_mtime, + be64_to_cpu(lvb->lvb_imtime_packed)); + ocfs2_unpack_timespec(&inode->i_ctime, + be64_to_cpu(lvb->lvb_ictime_packed)); + spin_unlock(&oi->ip_lock); + + mlog_exit_void(); +} + +static inline int ocfs2_meta_lvb_is_trustable(struct ocfs2_lock_res *lockres) +{ + struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; + + if (be32_to_cpu(lvb->lvb_version) == OCFS2_LVB_VERSION) + return 1; + return 0; +} + +/* Determine whether a lock resource needs to be refreshed, and + * arbitrate who gets to refresh it. + * + * 0 means no refresh needed. + * + * > 0 means you need to refresh this and you MUST call + * ocfs2_complete_lock_res_refresh afterwards. */ +static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) +{ + unsigned long flags; + int status = 0; + + mlog_entry_void(); + +refresh_check: + spin_lock_irqsave(&lockres->l_lock, flags); + if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + goto bail; + } + + if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + + ocfs2_wait_on_refreshing_lock(lockres); + goto refresh_check; + } + + /* Ok, I'll be the one to refresh this lock. */ + lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + status = 1; +bail: + mlog_exit(status); + return status; +} + +/* If status is non zero, I'll mark it as not being in refresh + * anymroe, but i won't clear the needs refresh flag. */ +static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, + int status) +{ + unsigned long flags; + mlog_entry_void(); + + spin_lock_irqsave(&lockres->l_lock, flags); + lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); + if (!status) + lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + wake_up(&lockres->l_event); + + mlog_exit_void(); +} + +/* may or may not return a bh if it went to disk. */ +static int ocfs2_meta_lock_update(struct inode *inode, + struct buffer_head **bh) +{ + int status = 0; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_lock_res *lockres; + struct ocfs2_dinode *fe; + + mlog_entry_void(); + + spin_lock(&oi->ip_lock); + if (oi->ip_flags & OCFS2_INODE_DELETED) { + mlog(0, "Orphaned inode %"MLFu64" was deleted while we " + "were waiting on a lock. ip_flags = 0x%x\n", + oi->ip_blkno, oi->ip_flags); + spin_unlock(&oi->ip_lock); + status = -ENOENT; + goto bail; + } + spin_unlock(&oi->ip_lock); + + lockres = &oi->ip_meta_lockres; + + if (!ocfs2_should_refresh_lock_res(lockres)) + goto bail; + + /* This will discard any caching information we might have had + * for the inode metadata. */ + ocfs2_metadata_cache_purge(inode); + + /* will do nothing for inode types that don't use the extent + * map (directories, bitmap files, etc) */ + ocfs2_extent_map_trunc(inode, 0); + + if (ocfs2_meta_lvb_is_trustable(lockres)) { + mlog(0, "Trusting LVB on inode %"MLFu64"\n", + oi->ip_blkno); + ocfs2_refresh_inode_from_lvb(inode); + } else { + /* Boo, we have to go to disk. */ + /* read bh, cast, ocfs2_refresh_inode */ + status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, + bh, OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto bail_refresh; + } + fe = (struct ocfs2_dinode *) (*bh)->b_data; + + /* This is a good chance to make sure we're not + * locking an invalid object. + * + * We bug on a stale inode here because we checked + * above whether it was wiped from disk. The wiping + * node provides a guarantee that we receive that + * message and can mark the inode before dropping any + * locks associated with it. */ + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); + status = -EIO; + goto bail_refresh; + } + mlog_bug_on_msg(inode->i_generation != + le32_to_cpu(fe->i_generation), + "Invalid dinode %"MLFu64" disk generation: %u " + "inode->i_generation: %u\n", + oi->ip_blkno, le32_to_cpu(fe->i_generation), + inode->i_generation); + mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || + !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), + "Stale dinode %"MLFu64" dtime: %"MLFu64" " + "flags: 0x%x\n", oi->ip_blkno, + le64_to_cpu(fe->i_dtime), + le32_to_cpu(fe->i_flags)); + + ocfs2_refresh_inode(inode, fe); + } + + status = 0; +bail_refresh: + ocfs2_complete_lock_res_refresh(lockres, status); +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_assign_bh(struct inode *inode, + struct buffer_head **ret_bh, + struct buffer_head *passed_bh) +{ + int status; + + if (passed_bh) { + /* Ok, the update went to disk for us, use the + * returned bh. */ + *ret_bh = passed_bh; + get_bh(*ret_bh); + + return 0; + } + + status = ocfs2_read_block(OCFS2_SB(inode->i_sb), + OCFS2_I(inode)->ip_blkno, + ret_bh, + OCFS2_BH_CACHED, + inode); + if (status < 0) + mlog_errno(status); + + return status; +} + +/* + * returns < 0 error if the callback will never be called, otherwise + * the result of the lock will be communicated via the callback. + */ +int ocfs2_meta_lock_full(struct inode *inode, + struct ocfs2_journal_handle *handle, + struct buffer_head **ret_bh, + int ex, + int arg_flags) +{ + int status, level, dlm_flags, acquired; + struct ocfs2_lock_res *lockres; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct buffer_head *local_bh = NULL; + + BUG_ON(!inode); + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64", take %s META lock\n", + OCFS2_I(inode)->ip_blkno, + ex ? "EXMODE" : "PRMODE"); + + status = 0; + acquired = 0; + /* We'll allow faking a readonly metadata lock for + * rodevices. */ + if (ocfs2_is_hard_readonly(osb)) { + if (ex) + status = -EROFS; + goto bail; + } + + if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) + wait_event(osb->recovery_event, + ocfs2_node_map_is_empty(osb, &osb->recovery_map)); + + acquired = 0; + lockres = &OCFS2_I(inode)->ip_meta_lockres; + level = ex ? LKM_EXMODE : LKM_PRMODE; + dlm_flags = 0; + if (arg_flags & OCFS2_META_LOCK_NOQUEUE) + dlm_flags |= LKM_NOQUEUE; + + status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); + if (status < 0) { + if (status != -EAGAIN && status != -EIOCBRETRY) + mlog_errno(status); + goto bail; + } + + /* Notify the error cleanup path to drop the cluster lock. */ + acquired = 1; + + /* We wait twice because a node may have died while we were in + * the lower dlm layers. The second time though, we've + * committed to owning this lock so we don't allow signals to + * abort the operation. */ + if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) + wait_event(osb->recovery_event, + ocfs2_node_map_is_empty(osb, &osb->recovery_map)); + + /* This is fun. The caller may want a bh back, or it may + * not. ocfs2_meta_lock_update definitely wants one in, but + * may or may not read one, depending on what's in the + * LVB. The result of all of this is that we've *only* gone to + * disk if we have to, so the complexity is worthwhile. */ + status = ocfs2_meta_lock_update(inode, &local_bh); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + if (ret_bh) { + status = ocfs2_assign_bh(inode, ret_bh, local_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + if (handle) { + status = ocfs2_handle_add_lock(handle, inode); + if (status < 0) + mlog_errno(status); + } + +bail: + if (status < 0) { + if (ret_bh && (*ret_bh)) { + brelse(*ret_bh); + *ret_bh = NULL; + } + if (acquired) + ocfs2_meta_unlock(inode, ex); + } + + if (local_bh) + brelse(local_bh); + + mlog_exit(status); + return status; +} + +/* + * This is working around a lock inversion between tasks acquiring DLM locks + * while holding a page lock and the vote thread which blocks dlm lock acquiry + * while acquiring page locks. + * + * ** These _with_page variantes are only intended to be called from aop + * methods that hold page locks and return a very specific *positive* error + * code that aop methods pass up to the VFS -- test for errors with != 0. ** + * + * The DLM is called such that it returns -EAGAIN if it would have blocked + * waiting for the vote thread. In that case we unlock our page so the vote + * thread can make progress. Once we've done this we have to return + * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up + * into the VFS who will then immediately retry the aop call. + * + * We do a blocking lock and immediate unlock before returning, though, so that + * the lock has a great chance of being cached on this node by the time the VFS + * calls back to retry the aop. This has a potential to livelock as nodes + * ping locks back and forth, but that's a risk we're willing to take to avoid + * the lock inversion simply. + */ +int ocfs2_meta_lock_with_page(struct inode *inode, + struct ocfs2_journal_handle *handle, + struct buffer_head **ret_bh, + int ex, + struct page *page) +{ + int ret; + + ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, + OCFS2_LOCK_NONBLOCK); + if (ret == -EAGAIN) { + unlock_page(page); + if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) + ocfs2_meta_unlock(inode, ex); + ret = AOP_TRUNCATED_PAGE; + } + + return ret; +} + +void ocfs2_meta_unlock(struct inode *inode, + int ex) +{ + int level = ex ? LKM_EXMODE : LKM_PRMODE; + struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; + + mlog_entry_void(); + + mlog(0, "inode %"MLFu64" drop %s META lock\n", + OCFS2_I(inode)->ip_blkno, + ex ? "EXMODE" : "PRMODE"); + + if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) + ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); + + mlog_exit_void(); +} + +int ocfs2_super_lock(struct ocfs2_super *osb, + int ex) +{ + int status; + int level = ex ? LKM_EXMODE : LKM_PRMODE; + struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; + struct buffer_head *bh; + struct ocfs2_slot_info *si = osb->slot_info; + + mlog_entry_void(); + + if (ocfs2_is_hard_readonly(osb)) + return -EROFS; + + status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* The super block lock path is really in the best position to + * know when resources covered by the lock need to be + * refreshed, so we do it here. Of course, making sense of + * everything is up to the caller :) */ + status = ocfs2_should_refresh_lock_res(lockres); + if (status < 0) { + mlog_errno(status); + goto bail; + } + if (status) { + bh = si->si_bh; + status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, + si->si_inode); + if (status == 0) + ocfs2_update_slot_info(si); + + ocfs2_complete_lock_res_refresh(lockres, status); + + if (status < 0) + mlog_errno(status); + } +bail: + mlog_exit(status); + return status; +} + +void ocfs2_super_unlock(struct ocfs2_super *osb, + int ex) +{ + int level = ex ? LKM_EXMODE : LKM_PRMODE; + struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; + + ocfs2_cluster_unlock(osb, lockres, level); +} + +int ocfs2_rename_lock(struct ocfs2_super *osb) +{ + int status; + struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; + + if (ocfs2_is_hard_readonly(osb)) + return -EROFS; + + status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); + if (status < 0) + mlog_errno(status); + + return status; +} + +void ocfs2_rename_unlock(struct ocfs2_super *osb) +{ + struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; + + ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); +} + +/* Reference counting of the dlm debug structure. We want this because + * open references on the debug inodes can live on after a mount, so + * we can't rely on the ocfs2_super to always exist. */ +static void ocfs2_dlm_debug_free(struct kref *kref) +{ + struct ocfs2_dlm_debug *dlm_debug; + + dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); + + kfree(dlm_debug); +} + +void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) +{ + if (dlm_debug) + kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); +} + +static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) +{ + kref_get(&debug->d_refcnt); +} + +struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) +{ + struct ocfs2_dlm_debug *dlm_debug; + + dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); + if (!dlm_debug) { + mlog_errno(-ENOMEM); + goto out; + } + + kref_init(&dlm_debug->d_refcnt); + INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); + dlm_debug->d_locking_state = NULL; +out: + return dlm_debug; +} + +/* Access to this is arbitrated for us via seq_file->sem. */ +struct ocfs2_dlm_seq_priv { + struct ocfs2_dlm_debug *p_dlm_debug; + struct ocfs2_lock_res p_iter_res; + struct ocfs2_lock_res p_tmp_res; +}; + +static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, + struct ocfs2_dlm_seq_priv *priv) +{ + struct ocfs2_lock_res *iter, *ret = NULL; + struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; + + assert_spin_locked(&ocfs2_dlm_tracking_lock); + + list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { + /* discover the head of the list */ + if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { + mlog(0, "End of list found, %p\n", ret); + break; + } + + /* We track our "dummy" iteration lockres' by a NULL + * l_ops field. */ + if (iter->l_ops != NULL) { + ret = iter; + break; + } + } + + return ret; +} + +static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) +{ + struct ocfs2_dlm_seq_priv *priv = m->private; + struct ocfs2_lock_res *iter; + + spin_lock(&ocfs2_dlm_tracking_lock); + iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); + if (iter) { + /* Since lockres' have the lifetime of their container + * (which can be inodes, ocfs2_supers, etc) we want to + * copy this out to a temporary lockres while still + * under the spinlock. Obviously after this we can't + * trust any pointers on the copy returned, but that's + * ok as the information we want isn't typically held + * in them. */ + priv->p_tmp_res = *iter; + iter = &priv->p_tmp_res; + } + spin_unlock(&ocfs2_dlm_tracking_lock); + + return iter; +} + +static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) +{ +} + +static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct ocfs2_dlm_seq_priv *priv = m->private; + struct ocfs2_lock_res *iter = v; + struct ocfs2_lock_res *dummy = &priv->p_iter_res; + + spin_lock(&ocfs2_dlm_tracking_lock); + iter = ocfs2_dlm_next_res(iter, priv); + list_del_init(&dummy->l_debug_list); + if (iter) { + list_add(&dummy->l_debug_list, &iter->l_debug_list); + priv->p_tmp_res = *iter; + iter = &priv->p_tmp_res; + } + spin_unlock(&ocfs2_dlm_tracking_lock); + + return iter; +} + +/* So that debugfs.ocfs2 can determine which format is being used */ +#define OCFS2_DLM_DEBUG_STR_VERSION 1 +static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) +{ + int i; + char *lvb; + struct ocfs2_lock_res *lockres = v; + + if (!lockres) + return -EINVAL; + + seq_printf(m, "0x%x\t" + "%.*s\t" + "%d\t" + "0x%lx\t" + "0x%x\t" + "0x%x\t" + "%u\t" + "%u\t" + "%d\t" + "%d\t", + OCFS2_DLM_DEBUG_STR_VERSION, + OCFS2_LOCK_ID_MAX_LEN, lockres->l_name, + lockres->l_level, + lockres->l_flags, + lockres->l_action, + lockres->l_unlock_action, + lockres->l_ro_holders, + lockres->l_ex_holders, + lockres->l_requested, + lockres->l_blocking); + + /* Dump the raw LVB */ + lvb = lockres->l_lksb.lvb; + for(i = 0; i < DLM_LVB_LEN; i++) + seq_printf(m, "0x%x\t", lvb[i]); + + /* End the line */ + seq_printf(m, "\n"); + return 0; +} + +static struct seq_operations ocfs2_dlm_seq_ops = { + .start = ocfs2_dlm_seq_start, + .stop = ocfs2_dlm_seq_stop, + .next = ocfs2_dlm_seq_next, + .show = ocfs2_dlm_seq_show, +}; + +static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq = (struct seq_file *) file->private_data; + struct ocfs2_dlm_seq_priv *priv = seq->private; + struct ocfs2_lock_res *res = &priv->p_iter_res; + + ocfs2_remove_lockres_tracking(res); + ocfs2_put_dlm_debug(priv->p_dlm_debug); + return seq_release_private(inode, file); +} + +static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) +{ + int ret; + struct ocfs2_dlm_seq_priv *priv; + struct seq_file *seq; + struct ocfs2_super *osb; + + priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + osb = (struct ocfs2_super *) inode->u.generic_ip; + ocfs2_get_dlm_debug(osb->osb_dlm_debug); + priv->p_dlm_debug = osb->osb_dlm_debug; + INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); + + ret = seq_open(file, &ocfs2_dlm_seq_ops); + if (ret) { + kfree(priv); + mlog_errno(ret); + goto out; + } + + seq = (struct seq_file *) file->private_data; + seq->private = priv; + + ocfs2_add_lockres_tracking(&priv->p_iter_res, + priv->p_dlm_debug); + +out: + return ret; +} + +static struct file_operations ocfs2_dlm_debug_fops = { + .open = ocfs2_dlm_debug_open, + .release = ocfs2_dlm_debug_release, + .read = seq_read, + .llseek = seq_lseek, +}; + +static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) +{ + int ret = 0; + struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; + + dlm_debug->d_locking_state = debugfs_create_file("locking_state", + S_IFREG|S_IRUSR, + osb->osb_debug_root, + osb, + &ocfs2_dlm_debug_fops); + if (!dlm_debug->d_locking_state) { + ret = -EINVAL; + mlog(ML_ERROR, + "Unable to create locking state debugfs file.\n"); + goto out; + } + + ocfs2_get_dlm_debug(dlm_debug); +out: + return ret; +} + +static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) +{ + struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; + + if (dlm_debug) { + debugfs_remove(dlm_debug->d_locking_state); + ocfs2_put_dlm_debug(dlm_debug); + } +} + +int ocfs2_dlm_init(struct ocfs2_super *osb) +{ + int status; + u32 dlm_key; + struct dlm_ctxt *dlm; + + mlog_entry_void(); + + status = ocfs2_dlm_init_debug(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* launch vote thread */ + osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote-%d", + osb->osb_id); + if (IS_ERR(osb->vote_task)) { + status = PTR_ERR(osb->vote_task); + osb->vote_task = NULL; + mlog_errno(status); + goto bail; + } + + /* used by the dlm code to make message headers unique, each + * node in this domain must agree on this. */ + dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); + + /* for now, uuid == domain */ + dlm = dlm_register_domain(osb->uuid_str, dlm_key); + if (IS_ERR(dlm)) { + status = PTR_ERR(dlm); + mlog_errno(status); + goto bail; + } + + ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); + ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); + + dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); + + osb->dlm = dlm; + + status = 0; +bail: + if (status < 0) { + ocfs2_dlm_shutdown_debug(osb); + if (osb->vote_task) + kthread_stop(osb->vote_task); + } + + mlog_exit(status); + return status; +} + +void ocfs2_dlm_shutdown(struct ocfs2_super *osb) +{ + mlog_entry_void(); + + dlm_unregister_eviction_cb(&osb->osb_eviction_cb); + + ocfs2_drop_osb_locks(osb); + + if (osb->vote_task) { + kthread_stop(osb->vote_task); + osb->vote_task = NULL; + } + + ocfs2_lock_res_free(&osb->osb_super_lockres); + ocfs2_lock_res_free(&osb->osb_rename_lockres); + + dlm_unregister_domain(osb->dlm); + osb->dlm = NULL; + + ocfs2_dlm_shutdown_debug(osb); + + mlog_exit_void(); +} + +static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status) +{ + struct ocfs2_lock_res *lockres = opaque; + unsigned long flags; + + mlog_entry_void(); + + mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, + lockres->l_unlock_action); + + spin_lock_irqsave(&lockres->l_lock, flags); + /* We tried to cancel a convert request, but it was already + * granted. All we want to do here is clear our unlock + * state. The wake_up call done at the bottom is redundant + * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't + * hurt anything anyway */ + if (status == DLM_CANCELGRANT && + lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { + mlog(0, "Got cancelgrant for %s\n", lockres->l_name); + + /* We don't clear the busy flag in this case as it + * should have been cleared by the ast which the dlm + * has called. */ + goto complete_unlock; + } + + if (status != DLM_NORMAL) { + mlog(ML_ERROR, "Dlm passes status %d for lock %s, " + "unlock_action %d\n", status, lockres->l_name, + lockres->l_unlock_action); + spin_unlock_irqrestore(&lockres->l_lock, flags); + return; + } + + switch(lockres->l_unlock_action) { + case OCFS2_UNLOCK_CANCEL_CONVERT: + mlog(0, "Cancel convert success for %s\n", lockres->l_name); + lockres->l_action = OCFS2_AST_INVALID; + break; + case OCFS2_UNLOCK_DROP_LOCK: + lockres->l_level = LKM_IVMODE; + break; + default: + BUG(); + } + + lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); +complete_unlock: + lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + wake_up(&lockres->l_event); + + mlog_exit_void(); +} + +typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); + +struct drop_lock_cb { + ocfs2_pre_drop_cb_t *drop_func; + void *drop_data; +}; + +static int ocfs2_drop_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + struct drop_lock_cb *dcb) +{ + enum dlm_status status; + unsigned long flags; + + /* We didn't get anywhere near actually using this lockres. */ + if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) + goto out; + + spin_lock_irqsave(&lockres->l_lock, flags); + + mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), + "lockres %s, flags 0x%lx\n", + lockres->l_name, lockres->l_flags); + + while (lockres->l_flags & OCFS2_LOCK_BUSY) { + mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " + "%u, unlock_action = %u\n", + lockres->l_name, lockres->l_flags, lockres->l_action, + lockres->l_unlock_action); + + spin_unlock_irqrestore(&lockres->l_lock, flags); + + /* XXX: Today we just wait on any busy + * locks... Perhaps we need to cancel converts in the + * future? */ + ocfs2_wait_on_busy_lock(lockres); + + spin_lock_irqsave(&lockres->l_lock, flags); + } + + if (dcb) + dcb->drop_func(lockres, dcb->drop_data); + + if (lockres->l_flags & OCFS2_LOCK_BUSY) + mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", + lockres->l_name); + if (lockres->l_flags & OCFS2_LOCK_BLOCKED) + mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); + + if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + goto out; + } + + lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); + + /* make sure we never get here while waiting for an ast to + * fire. */ + BUG_ON(lockres->l_action != OCFS2_AST_INVALID); + + /* is this necessary? */ + lockres_or_flags(lockres, OCFS2_LOCK_BUSY); + lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + mlog(0, "lock %s\n", lockres->l_name); + + status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK, + lockres->l_ops->unlock_ast, lockres); + if (status != DLM_NORMAL) { + ocfs2_log_dlm_error("dlmunlock", status, lockres); + mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); + dlm_print_one_lock(lockres->l_lksb.lockid); + BUG(); + } + mlog(0, "lock %s, successfull return from dlmunlock\n", + lockres->l_name); + + ocfs2_wait_on_busy_lock(lockres); +out: + mlog_exit(0); + return 0; +} + +/* Mark the lockres as being dropped. It will no longer be + * queued if blocking, but we still may have to wait on it + * being dequeued from the vote thread before we can consider + * it safe to drop. + * + * You can *not* attempt to call cluster_lock on this lockres anymore. */ +void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) +{ + int status; + struct ocfs2_mask_waiter mw; + unsigned long flags; + + ocfs2_init_mask_waiter(&mw); + + spin_lock_irqsave(&lockres->l_lock, flags); + lockres->l_flags |= OCFS2_LOCK_FREEING; + while (lockres->l_flags & OCFS2_LOCK_QUEUED) { + lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + mlog(0, "Waiting on lockres %s\n", lockres->l_name); + + status = ocfs2_wait_for_mask(&mw); + if (status) + mlog_errno(status); + + spin_lock_irqsave(&lockres->l_lock, flags); + } + spin_unlock_irqrestore(&lockres->l_lock, flags); +} + +static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) +{ + int status; + + mlog_entry_void(); + + ocfs2_mark_lockres_freeing(&osb->osb_super_lockres); + + status = ocfs2_drop_lock(osb, &osb->osb_super_lockres, NULL); + if (status < 0) + mlog_errno(status); + + ocfs2_mark_lockres_freeing(&osb->osb_rename_lockres); + + status = ocfs2_drop_lock(osb, &osb->osb_rename_lockres, NULL); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); +} + +static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) +{ + struct inode *inode = data; + + /* the metadata lock requires a bit more work as we have an + * LVB to worry about. */ + if (lockres->l_flags & OCFS2_LOCK_ATTACHED && + lockres->l_level == LKM_EXMODE && + !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) + __ocfs2_stuff_meta_lvb(inode); +} + +int ocfs2_drop_inode_locks(struct inode *inode) +{ + int status, err; + struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; + + mlog_entry_void(); + + /* No need to call ocfs2_mark_lockres_freeing here - + * ocfs2_clear_inode has done it for us. */ + + err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), + &OCFS2_I(inode)->ip_data_lockres, + NULL); + if (err < 0) + mlog_errno(err); + + status = err; + + err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), + &OCFS2_I(inode)->ip_meta_lockres, + &meta_dcb); + if (err < 0) + mlog_errno(err); + if (err < 0 && !status) + status = err; + + err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), + &OCFS2_I(inode)->ip_rw_lockres, + NULL); + if (err < 0) + mlog_errno(err); + if (err < 0 && !status) + status = err; + + mlog_exit(status); + return status; +} + +static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, + int new_level) +{ + assert_spin_locked(&lockres->l_lock); + + BUG_ON(lockres->l_blocking <= LKM_NLMODE); + + if (lockres->l_level <= new_level) { + mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", + lockres->l_level, new_level); + BUG(); + } + + mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", + lockres->l_name, new_level, lockres->l_blocking); + + lockres->l_action = OCFS2_AST_DOWNCONVERT; + lockres->l_requested = new_level; + lockres_or_flags(lockres, OCFS2_LOCK_BUSY); +} + +static int ocfs2_downconvert_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int new_level, + int lvb) +{ + int ret, dlm_flags = LKM_CONVERT; + enum dlm_status status; + + mlog_entry_void(); + + if (lvb) + dlm_flags |= LKM_VALBLK; + + status = dlmlock(osb->dlm, + new_level, + &lockres->l_lksb, + dlm_flags, + lockres->l_name, + lockres->l_ops->ast, + lockres, + lockres->l_ops->bast); + if (status != DLM_NORMAL) { + ocfs2_log_dlm_error("dlmlock", status, lockres); + ret = -EINVAL; + ocfs2_recover_from_dlm_error(lockres, 1); + goto bail; + } + + ret = 0; +bail: + mlog_exit(ret); + return ret; +} + +/* returns 1 when the caller should unlock and call dlmunlock */ +static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres) +{ + assert_spin_locked(&lockres->l_lock); + + mlog_entry_void(); + mlog(0, "lock %s\n", lockres->l_name); + + if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { + /* If we're already trying to cancel a lock conversion + * then just drop the spinlock and allow the caller to + * requeue this lock. */ + + mlog(0, "Lockres %s, skip convert\n", lockres->l_name); + return 0; + } + + /* were we in a convert when we got the bast fire? */ + BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && + lockres->l_action != OCFS2_AST_DOWNCONVERT); + /* set things up for the unlockast to know to just + * clear out the ast_action and unset busy, etc. */ + lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; + + mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), + "lock %s, invalid flags: 0x%lx\n", + lockres->l_name, lockres->l_flags); + + return 1; +} + +static int ocfs2_cancel_convert(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres) +{ + int ret; + enum dlm_status status; + + mlog_entry_void(); + mlog(0, "lock %s\n", lockres->l_name); + + ret = 0; + status = dlmunlock(osb->dlm, + &lockres->l_lksb, + LKM_CANCEL, + lockres->l_ops->unlock_ast, + lockres); + if (status != DLM_NORMAL) { + ocfs2_log_dlm_error("dlmunlock", status, lockres); + ret = -EINVAL; + ocfs2_recover_from_dlm_error(lockres, 0); + } + + mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); + + mlog_exit(ret); + return ret; +} + +static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, + struct ocfs2_lock_res *lockres, + int new_level) +{ + int ret; + + mlog_entry_void(); + + BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); + + if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { + ret = 0; + mlog(0, "lockres %s currently being refreshed -- backing " + "off!\n", lockres->l_name); + } else if (new_level == LKM_PRMODE) + ret = !lockres->l_ex_holders && + ocfs2_inode_fully_checkpointed(inode); + else /* Must be NLMODE we're converting to. */ + ret = !lockres->l_ro_holders && !lockres->l_ex_holders && + ocfs2_inode_fully_checkpointed(inode); + + mlog_exit(ret); + return ret; +} + +static int ocfs2_do_unblock_meta(struct inode *inode, + int *requeue) +{ + int new_level; + int set_lvb = 0; + int ret = 0; + struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; + unsigned long flags; + + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + mlog_entry_void(); + + spin_lock_irqsave(&lockres->l_lock, flags); + + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); + + mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, + lockres->l_blocking); + + BUG_ON(lockres->l_level != LKM_EXMODE && + lockres->l_level != LKM_PRMODE); + + if (lockres->l_flags & OCFS2_LOCK_BUSY) { + *requeue = 1; + ret = ocfs2_prepare_cancel_convert(osb, lockres); + spin_unlock_irqrestore(&lockres->l_lock, flags); + if (ret) { + ret = ocfs2_cancel_convert(osb, lockres); + if (ret < 0) + mlog_errno(ret); + } + goto leave; + } + + new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); + + mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", + lockres->l_level, lockres->l_blocking, new_level); + + if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { + if (lockres->l_level == LKM_EXMODE) + set_lvb = 1; + + /* If the lock hasn't been refreshed yet (rare), then + * our memory inode values are old and we skip + * stuffing the lvb. There's no need to actually clear + * out the lvb here as it's value is still valid. */ + if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { + if (set_lvb) + __ocfs2_stuff_meta_lvb(inode); + } else + mlog(0, "lockres %s: downconverting stale lock!\n", + lockres->l_name); + + mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " + "l_blocking=%d, new_level=%d\n", + lockres->l_level, lockres->l_blocking, new_level); + + ocfs2_prepare_downconvert(lockres, new_level); + spin_unlock_irqrestore(&lockres->l_lock, flags); + ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); + goto leave; + } + if (!ocfs2_inode_fully_checkpointed(inode)) + ocfs2_start_checkpoint(osb); + + *requeue = 1; + spin_unlock_irqrestore(&lockres->l_lock, flags); + ret = 0; +leave: + mlog_exit(ret); + return ret; +} + +static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres, + int *requeue, + ocfs2_convert_worker_t *worker) +{ + unsigned long flags; + int blocking; + int new_level; + int ret = 0; + + mlog_entry_void(); + + spin_lock_irqsave(&lockres->l_lock, flags); + + BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); + +recheck: + if (lockres->l_flags & OCFS2_LOCK_BUSY) { + *requeue = 1; + ret = ocfs2_prepare_cancel_convert(osb, lockres); + spin_unlock_irqrestore(&lockres->l_lock, flags); + if (ret) { + ret = ocfs2_cancel_convert(osb, lockres); + if (ret < 0) + mlog_errno(ret); + } + goto leave; + } + + /* if we're blocking an exclusive and we have *any* holders, + * then requeue. */ + if ((lockres->l_blocking == LKM_EXMODE) + && (lockres->l_ex_holders || lockres->l_ro_holders)) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + *requeue = 1; + ret = 0; + goto leave; + } + + /* If it's a PR we're blocking, then only + * requeue if we've got any EX holders */ + if (lockres->l_blocking == LKM_PRMODE && + lockres->l_ex_holders) { + spin_unlock_irqrestore(&lockres->l_lock, flags); + *requeue = 1; + ret = 0; + goto leave; + } + + /* If we get here, then we know that there are no more + * incompatible holders (and anyone asking for an incompatible + * lock is blocked). We can now downconvert the lock */ + if (!worker) + goto downconvert; + + /* Some lockres types want to do a bit of work before + * downconverting a lock. Allow that here. The worker function + * may sleep, so we save off a copy of what we're blocking as + * it may change while we're not holding the spin lock. */ + blocking = lockres->l_blocking; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + worker(lockres, blocking); + + spin_lock_irqsave(&lockres->l_lock, flags); + if (blocking != lockres->l_blocking) { + /* If this changed underneath us, then we can't drop + * it just yet. */ + goto recheck; + } + +downconvert: + *requeue = 0; + new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); + + ocfs2_prepare_downconvert(lockres, new_level); + spin_unlock_irqrestore(&lockres->l_lock, flags); + ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); +leave: + mlog_exit(ret); + return ret; +} + +static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, + int blocking) +{ + struct inode *inode; + struct address_space *mapping; + + mlog_entry_void(); + + inode = ocfs2_lock_res_inode(lockres); + mapping = inode->i_mapping; + + if (filemap_fdatawrite(mapping)) { + mlog(ML_ERROR, "Could not sync inode %"MLFu64" for downconvert!", + OCFS2_I(inode)->ip_blkno); + } + sync_mapping_buffers(mapping); + if (blocking == LKM_EXMODE) { + truncate_inode_pages(mapping, 0); + unmap_mapping_range(mapping, 0, 0, 0); + } else { + /* We only need to wait on the I/O if we're not also + * truncating pages because truncate_inode_pages waits + * for us above. We don't truncate pages if we're + * blocking anything < EXMODE because we want to keep + * them around in that case. */ + filemap_fdatawait(mapping); + } + + mlog_exit_void(); +} + +int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, + int *requeue) +{ + int status; + struct inode *inode; + struct ocfs2_super *osb; + + mlog_entry_void(); + + inode = ocfs2_lock_res_inode(lockres); + osb = OCFS2_SB(inode->i_sb); + + mlog(0, "unblock inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + status = ocfs2_generic_unblock_lock(osb, + lockres, + requeue, + ocfs2_data_convert_worker); + if (status < 0) + mlog_errno(status); + + mlog(0, "inode %"MLFu64", requeue = %d\n", + OCFS2_I(inode)->ip_blkno, *requeue); + + mlog_exit(status); + return status; +} + +static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, + int *requeue) +{ + int status; + struct inode *inode; + + mlog_entry_void(); + + mlog(0, "Unblock lockres %s\n", lockres->l_name); + + inode = ocfs2_lock_res_inode(lockres); + + status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), + lockres, + requeue, + NULL); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); + return status; +} + + +int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, + int *requeue) +{ + int status; + struct inode *inode; + + mlog_entry_void(); + + inode = ocfs2_lock_res_inode(lockres); + + mlog(0, "unblock inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + status = ocfs2_do_unblock_meta(inode, requeue); + if (status < 0) + mlog_errno(status); + + mlog(0, "inode %"MLFu64", requeue = %d\n", + OCFS2_I(inode)->ip_blkno, *requeue); + + mlog_exit(status); + return status; +} + +/* Generic unblock function for any lockres whose private data is an + * ocfs2_super pointer. */ +static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, + int *requeue) +{ + int status; + struct ocfs2_super *osb; + + mlog_entry_void(); + + mlog(0, "Unblock lockres %s\n", lockres->l_name); + + osb = ocfs2_lock_res_super(lockres); + + status = ocfs2_generic_unblock_lock(osb, + lockres, + requeue, + NULL); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); + return status; +} + +void ocfs2_process_blocked_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres) +{ + int status; + int requeue = 0; + unsigned long flags; + + /* Our reference to the lockres in this function can be + * considered valid until we remove the OCFS2_LOCK_QUEUED + * flag. */ + + mlog_entry_void(); + + BUG_ON(!lockres); + BUG_ON(!lockres->l_ops); + BUG_ON(!lockres->l_ops->unblock); + + mlog(0, "lockres %s blocked.\n", lockres->l_name); + + /* Detect whether a lock has been marked as going away while + * the vote thread was processing other things. A lock can + * still be marked with OCFS2_LOCK_FREEING after this check, + * but short circuiting here will still save us some + * performance. */ + spin_lock_irqsave(&lockres->l_lock, flags); + if (lockres->l_flags & OCFS2_LOCK_FREEING) + goto unqueue; + spin_unlock_irqrestore(&lockres->l_lock, flags); + + status = lockres->l_ops->unblock(lockres, &requeue); + if (status < 0) + mlog_errno(status); + + spin_lock_irqsave(&lockres->l_lock, flags); +unqueue: + if (lockres->l_flags & OCFS2_LOCK_FREEING || !requeue) { + lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); + } else + ocfs2_schedule_blocked_lock(osb, lockres); + + mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, + requeue ? "yes" : "no"); + spin_unlock_irqrestore(&lockres->l_lock, flags); + + mlog_exit_void(); +} + +static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres) +{ + mlog_entry_void(); + + assert_spin_locked(&lockres->l_lock); + + if (lockres->l_flags & OCFS2_LOCK_FREEING) { + /* Do not schedule a lock for downconvert when it's on + * the way to destruction - any nodes wanting access + * to the resource will get it soon. */ + mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", + lockres->l_name, lockres->l_flags); + return; + } + + lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); + + spin_lock(&osb->vote_task_lock); + if (list_empty(&lockres->l_blocked_list)) { + list_add_tail(&lockres->l_blocked_list, + &osb->blocked_lock_list); + osb->blocked_lock_count++; + } + spin_unlock(&osb->vote_task_lock); + + mlog_exit_void(); +} + +/* This aids in debugging situations where a bad LVB might be involved. */ +void ocfs2_dump_meta_lvb_info(u64 level, + const char *function, + unsigned int line, + struct ocfs2_lock_res *lockres) +{ + struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; + + mlog(level, "LVB information for %s (called from %s:%u):\n", + lockres->l_name, function, line); + mlog(level, "version: %u, clusters: %u\n", + be32_to_cpu(lvb->lvb_version), be32_to_cpu(lvb->lvb_iclusters)); + mlog(level, "size: %"MLFu64", uid %u, gid %u, mode 0x%x\n", + be64_to_cpu(lvb->lvb_isize), be32_to_cpu(lvb->lvb_iuid), + be32_to_cpu(lvb->lvb_igid), be16_to_cpu(lvb->lvb_imode)); + mlog(level, "nlink %u, atime_packed 0x%"MLFx64", " + "ctime_packed 0x%"MLFx64", mtime_packed 0x%"MLFx64"\n", + be16_to_cpu(lvb->lvb_inlink), be64_to_cpu(lvb->lvb_iatime_packed), + be64_to_cpu(lvb->lvb_ictime_packed), + be64_to_cpu(lvb->lvb_imtime_packed)); +} diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h new file mode 100644 index 0000000..8f2d1db --- /dev/null +++ b/fs/ocfs2/dlmglue.h @@ -0,0 +1,111 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmglue.h + * + * description here + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + + +#ifndef DLMGLUE_H +#define DLMGLUE_H + +#define OCFS2_LVB_VERSION 2 + +struct ocfs2_meta_lvb { + __be32 lvb_version; + __be32 lvb_iclusters; + __be32 lvb_iuid; + __be32 lvb_igid; + __be64 lvb_iatime_packed; + __be64 lvb_ictime_packed; + __be64 lvb_imtime_packed; + __be64 lvb_isize; + __be16 lvb_imode; + __be16 lvb_inlink; + __be32 lvb_reserved[3]; +}; + +/* ocfs2_meta_lock_full() and ocfs2_data_lock_full() 'arg_flags' flags */ +/* don't wait on recovery. */ +#define OCFS2_META_LOCK_RECOVERY (0x01) +/* Instruct the dlm not to queue ourselves on the other node. */ +#define OCFS2_META_LOCK_NOQUEUE (0x02) +/* don't block waiting for the vote thread, instead return -EAGAIN */ +#define OCFS2_LOCK_NONBLOCK (0x04) + +int ocfs2_dlm_init(struct ocfs2_super *osb); +void ocfs2_dlm_shutdown(struct ocfs2_super *osb); +void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res); +void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, + enum ocfs2_lock_type type, + struct inode *inode); +void ocfs2_lock_res_free(struct ocfs2_lock_res *res); +int ocfs2_create_new_inode_locks(struct inode *inode); +int ocfs2_drop_inode_locks(struct inode *inode); +int ocfs2_data_lock_full(struct inode *inode, + int write, + int arg_flags); +#define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0) +int ocfs2_data_lock_with_page(struct inode *inode, + int write, + struct page *page); +void ocfs2_data_unlock(struct inode *inode, + int write); +int ocfs2_rw_lock(struct inode *inode, int write); +void ocfs2_rw_unlock(struct inode *inode, int write); +int ocfs2_meta_lock_full(struct inode *inode, + struct ocfs2_journal_handle *handle, + struct buffer_head **ret_bh, + int ex, + int arg_flags); +int ocfs2_meta_lock_with_page(struct inode *inode, + struct ocfs2_journal_handle *handle, + struct buffer_head **ret_bh, + int ex, + struct page *page); +/* 99% of the time we don't want to supply any additional flags -- + * those are for very specific cases only. */ +#define ocfs2_meta_lock(i, h, b, e) ocfs2_meta_lock_full(i, h, b, e, 0) +void ocfs2_meta_unlock(struct inode *inode, + int ex); +int ocfs2_super_lock(struct ocfs2_super *osb, + int ex); +void ocfs2_super_unlock(struct ocfs2_super *osb, + int ex); +int ocfs2_rename_lock(struct ocfs2_super *osb); +void ocfs2_rename_unlock(struct ocfs2_super *osb); +void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres); + +/* for the vote thread */ +void ocfs2_process_blocked_lock(struct ocfs2_super *osb, + struct ocfs2_lock_res *lockres); + +struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void); +void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug); + +/* aids in debugging and tracking lvbs */ +void ocfs2_dump_meta_lvb_info(u64 level, + const char *function, + unsigned int line, + struct ocfs2_lock_res *lockres); +#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) + +#endif /* DLMGLUE_H */ diff --git a/fs/ocfs2/endian.h b/fs/ocfs2/endian.h new file mode 100644 index 0000000..f226b22 --- /dev/null +++ b/fs/ocfs2/endian.h @@ -0,0 +1,45 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_ENDIAN_H +#define OCFS2_ENDIAN_H + +static inline void le16_add_cpu(__le16 *var, u16 val) +{ + *var = cpu_to_le16(le16_to_cpu(*var) + val); +} + +static inline void le32_add_cpu(__le32 *var, u32 val) +{ + *var = cpu_to_le32(le32_to_cpu(*var) + val); +} + +static inline void le32_and_cpu(__le32 *var, u32 val) +{ + *var = cpu_to_le32(le32_to_cpu(*var) & val); +} + +static inline void be32_add_cpu(__be32 *var, u32 val) +{ + *var = cpu_to_be32(be32_to_cpu(*var) + val); +} + +#endif /* OCFS2_ENDIAN_H */ diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c new file mode 100644 index 0000000..5810160 --- /dev/null +++ b/fs/ocfs2/export.c @@ -0,0 +1,248 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * export.c + * + * Functions to facilitate NFS exporting + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> + +#define MLOG_MASK_PREFIX ML_EXPORT +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "dir.h" +#include "dlmglue.h" +#include "export.h" +#include "inode.h" + +#include "buffer_head_io.h" + +struct ocfs2_inode_handle +{ + u64 ih_blkno; + u32 ih_generation; +}; + +static struct dentry *ocfs2_get_dentry(struct super_block *sb, void *vobjp) +{ + struct ocfs2_inode_handle *handle = vobjp; + struct inode *inode; + struct dentry *result; + + mlog_entry("(0x%p, 0x%p)\n", sb, handle); + + if (handle->ih_blkno == 0) { + mlog_errno(-ESTALE); + return ERR_PTR(-ESTALE); + } + + inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno); + + if (IS_ERR(inode)) { + mlog_errno(PTR_ERR(inode)); + return (void *)inode; + } + + if (handle->ih_generation != inode->i_generation) { + iput(inode); + mlog_errno(-ESTALE); + return ERR_PTR(-ESTALE); + } + + result = d_alloc_anon(inode); + + if (!result) { + iput(inode); + mlog_errno(-ENOMEM); + return ERR_PTR(-ENOMEM); + } + + mlog_exit_ptr(result); + return result; +} + +static struct dentry *ocfs2_get_parent(struct dentry *child) +{ + int status; + u64 blkno; + struct dentry *parent; + struct inode *inode; + struct inode *dir = child->d_inode; + struct buffer_head *dirent_bh = NULL; + struct ocfs2_dir_entry *dirent; + + mlog_entry("(0x%p, '%.*s')\n", child, + child->d_name.len, child->d_name.name); + + mlog(0, "find parent of directory %"MLFu64"\n", + OCFS2_I(dir)->ip_blkno); + + status = ocfs2_meta_lock(dir, NULL, NULL, 0); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + parent = ERR_PTR(status); + goto bail; + } + + status = ocfs2_find_files_on_disk("..", 2, &blkno, dir, &dirent_bh, + &dirent); + if (status < 0) { + parent = ERR_PTR(-ENOENT); + goto bail_unlock; + } + + inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno); + if (IS_ERR(inode)) { + mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno); + parent = ERR_PTR(-EACCES); + goto bail_unlock; + } + + parent = d_alloc_anon(inode); + if (!parent) { + iput(inode); + parent = ERR_PTR(-ENOMEM); + } + +bail_unlock: + ocfs2_meta_unlock(dir, 0); + + if (dirent_bh) + brelse(dirent_bh); + +bail: + mlog_exit_ptr(parent); + + return parent; +} + +static int ocfs2_encode_fh(struct dentry *dentry, __be32 *fh, int *max_len, + int connectable) +{ + struct inode *inode = dentry->d_inode; + int len = *max_len; + int type = 1; + u64 blkno; + u32 generation; + + mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, + dentry->d_name.len, dentry->d_name.name, + fh, len, connectable); + + if (len < 3 || (connectable && len < 6)) { + mlog(ML_ERROR, "fh buffer is too small for encoding\n"); + type = 255; + goto bail; + } + + blkno = OCFS2_I(inode)->ip_blkno; + generation = inode->i_generation; + + mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n", + blkno, generation); + + len = 3; + fh[0] = cpu_to_le32((u32)(blkno >> 32)); + fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); + fh[2] = cpu_to_le32(generation); + + if (connectable && !S_ISDIR(inode->i_mode)) { + struct inode *parent; + + spin_lock(&dentry->d_lock); + + parent = dentry->d_parent->d_inode; + blkno = OCFS2_I(parent)->ip_blkno; + generation = parent->i_generation; + + fh[3] = cpu_to_le32((u32)(blkno >> 32)); + fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); + fh[5] = cpu_to_le32(generation); + + spin_unlock(&dentry->d_lock); + + len = 6; + type = 2; + + mlog(0, "Encoding parent: blkno: %"MLFu64", generation: %u\n", + blkno, generation); + } + + *max_len = len; + +bail: + mlog_exit(type); + return type; +} + +static struct dentry *ocfs2_decode_fh(struct super_block *sb, __be32 *fh, + int fh_len, int fileid_type, + int (*acceptable)(void *context, + struct dentry *de), + void *context) +{ + struct ocfs2_inode_handle handle, parent; + struct dentry *ret = NULL; + + mlog_entry("(0x%p, 0x%p, %d, %d, 0x%p, 0x%p)\n", + sb, fh, fh_len, fileid_type, acceptable, context); + + if (fh_len < 3 || fileid_type > 2) + goto bail; + + if (fileid_type == 2) { + if (fh_len < 6) + goto bail; + + parent.ih_blkno = (u64)le32_to_cpu(fh[3]) << 32; + parent.ih_blkno |= (u64)le32_to_cpu(fh[4]); + parent.ih_generation = le32_to_cpu(fh[5]); + + mlog(0, "Decoding parent: blkno: %"MLFu64", generation: %u\n", + parent.ih_blkno, parent.ih_generation); + } + + handle.ih_blkno = (u64)le32_to_cpu(fh[0]) << 32; + handle.ih_blkno |= (u64)le32_to_cpu(fh[1]); + handle.ih_generation = le32_to_cpu(fh[2]); + + mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n", + handle.ih_blkno, handle.ih_generation); + + ret = ocfs2_export_ops.find_exported_dentry(sb, &handle, &parent, + acceptable, context); + +bail: + mlog_exit_ptr(ret); + return ret; +} + +struct export_operations ocfs2_export_ops = { + .decode_fh = ocfs2_decode_fh, + .encode_fh = ocfs2_encode_fh, + + .get_parent = ocfs2_get_parent, + .get_dentry = ocfs2_get_dentry, +}; diff --git a/fs/ocfs2/export.h b/fs/ocfs2/export.h new file mode 100644 index 0000000..5b77ee7 --- /dev/null +++ b/fs/ocfs2/export.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * export.h + * + * Function prototypes + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_EXPORT_H +#define OCFS2_EXPORT_H + +extern struct export_operations ocfs2_export_ops; + +#endif /* OCFS2_EXPORT_H */ diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c new file mode 100644 index 0000000..f2fb40c --- /dev/null +++ b/fs/ocfs2/extent_map.c @@ -0,0 +1,994 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * extent_map.c + * + * In-memory extent map for OCFS2. Man, this code was prettier in + * the library. + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/rbtree.h> + +#define MLOG_MASK_PREFIX ML_EXTENT_MAP +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "extent_map.h" +#include "inode.h" +#include "super.h" + +#include "buffer_head_io.h" + + +/* + * SUCK SUCK SUCK + * Our headers are so bad that struct ocfs2_extent_map is in ocfs.h + */ + +struct ocfs2_extent_map_entry { + struct rb_node e_node; + int e_tree_depth; + struct ocfs2_extent_rec e_rec; +}; + +struct ocfs2_em_insert_context { + int need_left; + int need_right; + struct ocfs2_extent_map_entry *new_ent; + struct ocfs2_extent_map_entry *old_ent; + struct ocfs2_extent_map_entry *left_ent; + struct ocfs2_extent_map_entry *right_ent; +}; + +static kmem_cache_t *ocfs2_em_ent_cachep = NULL; + + +static struct ocfs2_extent_map_entry * +ocfs2_extent_map_lookup(struct ocfs2_extent_map *em, + u32 cpos, u32 clusters, + struct rb_node ***ret_p, + struct rb_node **ret_parent); +static int ocfs2_extent_map_insert(struct inode *inode, + struct ocfs2_extent_rec *rec, + int tree_depth); +static int ocfs2_extent_map_insert_entry(struct ocfs2_extent_map *em, + struct ocfs2_extent_map_entry *ent); +static int ocfs2_extent_map_find_leaf(struct inode *inode, + u32 cpos, u32 clusters, + struct ocfs2_extent_list *el); +static int ocfs2_extent_map_lookup_read(struct inode *inode, + u32 cpos, u32 clusters, + struct ocfs2_extent_map_entry **ret_ent); +static int ocfs2_extent_map_try_insert(struct inode *inode, + struct ocfs2_extent_rec *rec, + int tree_depth, + struct ocfs2_em_insert_context *ctxt); + +/* returns 1 only if the rec contains all the given clusters -- that is that + * rec's cpos is <= the cluster cpos and that the rec endpoint (cpos + + * clusters) is >= the argument's endpoint */ +static int ocfs2_extent_rec_contains_clusters(struct ocfs2_extent_rec *rec, + u32 cpos, u32 clusters) +{ + if (le32_to_cpu(rec->e_cpos) > cpos) + return 0; + if (cpos + clusters > le32_to_cpu(rec->e_cpos) + + le32_to_cpu(rec->e_clusters)) + return 0; + return 1; +} + + +/* + * Find an entry in the tree that intersects the region passed in. + * Note that this will find straddled intervals, it is up to the + * callers to enforce any boundary conditions. + * + * Callers must hold ip_lock. This lookup is not guaranteed to return + * a tree_depth 0 match, and as such can race inserts if the lock + * were not held. + * + * The rb_node garbage lets insertion share the search. Trivial + * callers pass NULL. + */ +static struct ocfs2_extent_map_entry * +ocfs2_extent_map_lookup(struct ocfs2_extent_map *em, + u32 cpos, u32 clusters, + struct rb_node ***ret_p, + struct rb_node **ret_parent) +{ + struct rb_node **p = &em->em_extents.rb_node; + struct rb_node *parent = NULL; + struct ocfs2_extent_map_entry *ent = NULL; + + while (*p) + { + parent = *p; + ent = rb_entry(parent, struct ocfs2_extent_map_entry, + e_node); + if ((cpos + clusters) <= le32_to_cpu(ent->e_rec.e_cpos)) { + p = &(*p)->rb_left; + ent = NULL; + } else if (cpos >= (le32_to_cpu(ent->e_rec.e_cpos) + + le32_to_cpu(ent->e_rec.e_clusters))) { + p = &(*p)->rb_right; + ent = NULL; + } else + break; + } + + if (ret_p != NULL) + *ret_p = p; + if (ret_parent != NULL) + *ret_parent = parent; + return ent; +} + +/* + * Find the leaf containing the interval we want. While we're on our + * way down the tree, fill in every record we see at any depth, because + * we might want it later. + * + * Note that this code is run without ip_lock. That's because it + * sleeps while reading. If someone is also filling the extent list at + * the same time we are, we might have to restart. + */ +static int ocfs2_extent_map_find_leaf(struct inode *inode, + u32 cpos, u32 clusters, + struct ocfs2_extent_list *el) +{ + int i, ret; + struct buffer_head *eb_bh = NULL; + u64 blkno; + u32 rec_end; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_rec *rec; + + /* + * The bh data containing the el cannot change here, because + * we hold alloc_sem. So we can do this without other + * locks. + */ + while (el->l_tree_depth) + { + blkno = 0; + for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { + rec = &el->l_recs[i]; + rec_end = (le32_to_cpu(rec->e_cpos) + + le32_to_cpu(rec->e_clusters)); + + ret = -EBADR; + if (rec_end > OCFS2_I(inode)->ip_clusters) { + mlog_errno(ret); + goto out_free; + } + + if (rec_end <= cpos) { + ret = ocfs2_extent_map_insert(inode, rec, + le16_to_cpu(el->l_tree_depth)); + if (ret && (ret != -EEXIST)) { + mlog_errno(ret); + goto out_free; + } + continue; + } + if ((cpos + clusters) <= le32_to_cpu(rec->e_cpos)) { + ret = ocfs2_extent_map_insert(inode, rec, + le16_to_cpu(el->l_tree_depth)); + if (ret && (ret != -EEXIST)) { + mlog_errno(ret); + goto out_free; + } + continue; + } + + /* + * We've found a record that matches our + * interval. We don't insert it because we're + * about to traverse it. + */ + + /* Check to see if we're stradling */ + ret = -ESRCH; + if (!ocfs2_extent_rec_contains_clusters(rec, + cpos, + clusters)) { + mlog_errno(ret); + goto out_free; + } + + /* + * If we've already found a record, the el has + * two records covering the same interval. + * EEEK! + */ + ret = -EBADR; + if (blkno) { + mlog_errno(ret); + goto out_free; + } + + blkno = le64_to_cpu(rec->e_blkno); + } + + /* + * We don't support holes, and we're still up + * in the branches, so we'd better have found someone + */ + ret = -EBADR; + if (!blkno) { + mlog_errno(ret); + goto out_free; + } + + if (eb_bh) { + brelse(eb_bh); + eb_bh = NULL; + } + ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), + blkno, &eb_bh, OCFS2_BH_CACHED, + inode); + if (ret) { + mlog_errno(ret); + goto out_free; + } + eb = (struct ocfs2_extent_block *)eb_bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + ret = -EIO; + goto out_free; + } + el = &eb->h_list; + } + + if (el->l_tree_depth) + BUG(); + + for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { + rec = &el->l_recs[i]; + ret = ocfs2_extent_map_insert(inode, rec, + le16_to_cpu(el->l_tree_depth)); + if (ret) { + mlog_errno(ret); + goto out_free; + } + } + + ret = 0; + +out_free: + if (eb_bh) + brelse(eb_bh); + + return ret; +} + +/* + * This lookup actually will read from disk. It has one invariant: + * It will never re-traverse blocks. This means that all inserts should + * be new regions or more granular regions (both allowed by insert). + */ +static int ocfs2_extent_map_lookup_read(struct inode *inode, + u32 cpos, + u32 clusters, + struct ocfs2_extent_map_entry **ret_ent) +{ + int ret; + u64 blkno; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent; + struct buffer_head *bh = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_dinode *di; + struct ocfs2_extent_list *el; + + spin_lock(&OCFS2_I(inode)->ip_lock); + ent = ocfs2_extent_map_lookup(em, cpos, clusters, NULL, NULL); + if (ent) { + if (!ent->e_tree_depth) { + spin_unlock(&OCFS2_I(inode)->ip_lock); + *ret_ent = ent; + return 0; + } + blkno = le64_to_cpu(ent->e_rec.e_blkno); + spin_unlock(&OCFS2_I(inode)->ip_lock); + + ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, &bh, + OCFS2_BH_CACHED, inode); + if (ret) { + mlog_errno(ret); + if (bh) + brelse(bh); + return ret; + } + eb = (struct ocfs2_extent_block *)bh->b_data; + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); + brelse(bh); + return -EIO; + } + el = &eb->h_list; + } else { + spin_unlock(&OCFS2_I(inode)->ip_lock); + + ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), + OCFS2_I(inode)->ip_blkno, &bh, + OCFS2_BH_CACHED, inode); + if (ret) { + mlog_errno(ret); + if (bh) + brelse(bh); + return ret; + } + di = (struct ocfs2_dinode *)bh->b_data; + if (!OCFS2_IS_VALID_DINODE(di)) { + brelse(bh); + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, di); + return -EIO; + } + el = &di->id2.i_list; + } + + ret = ocfs2_extent_map_find_leaf(inode, cpos, clusters, el); + brelse(bh); + if (ret) { + mlog_errno(ret); + return ret; + } + + ent = ocfs2_extent_map_lookup(em, cpos, clusters, NULL, NULL); + if (!ent) { + ret = -ESRCH; + mlog_errno(ret); + return ret; + } + + if (ent->e_tree_depth) + BUG(); /* FIXME: Make sure this isn't a corruption */ + + *ret_ent = ent; + + return 0; +} + +/* + * Callers must hold ip_lock. This can insert pieces of the tree, + * thus racing lookup if the lock weren't held. + */ +static int ocfs2_extent_map_insert_entry(struct ocfs2_extent_map *em, + struct ocfs2_extent_map_entry *ent) +{ + struct rb_node **p, *parent; + struct ocfs2_extent_map_entry *old_ent; + + old_ent = ocfs2_extent_map_lookup(em, le32_to_cpu(ent->e_rec.e_cpos), + le32_to_cpu(ent->e_rec.e_clusters), + &p, &parent); + if (old_ent) + return -EEXIST; + + rb_link_node(&ent->e_node, parent, p); + rb_insert_color(&ent->e_node, &em->em_extents); + + return 0; +} + + +/* + * Simple rule: on any return code other than -EAGAIN, anything left + * in the insert_context will be freed. + */ +static int ocfs2_extent_map_try_insert(struct inode *inode, + struct ocfs2_extent_rec *rec, + int tree_depth, + struct ocfs2_em_insert_context *ctxt) +{ + int ret; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *old_ent; + + ctxt->need_left = 0; + ctxt->need_right = 0; + ctxt->old_ent = NULL; + + spin_lock(&OCFS2_I(inode)->ip_lock); + ret = ocfs2_extent_map_insert_entry(em, ctxt->new_ent); + if (!ret) { + ctxt->new_ent = NULL; + goto out_unlock; + } + + old_ent = ocfs2_extent_map_lookup(em, le32_to_cpu(rec->e_cpos), + le32_to_cpu(rec->e_clusters), NULL, + NULL); + + if (!old_ent) + BUG(); + + ret = -EEXIST; + if (old_ent->e_tree_depth < tree_depth) + goto out_unlock; + + if (old_ent->e_tree_depth == tree_depth) { + if (!memcmp(rec, &old_ent->e_rec, + sizeof(struct ocfs2_extent_rec))) + ret = 0; + + /* FIXME: Should this be ESRCH/EBADR??? */ + goto out_unlock; + } + + /* + * We do it in this order specifically so that no actual tree + * changes occur until we have all the pieces we need. We + * don't want malloc failures to leave an inconsistent tree. + * Whenever we drop the lock, another process could be + * inserting. Also note that, if another process just beat us + * to an insert, we might not need the same pieces we needed + * the first go round. In the end, the pieces we need will + * be used, and the pieces we don't will be freed. + */ + ctxt->need_left = !!(le32_to_cpu(rec->e_cpos) > + le32_to_cpu(old_ent->e_rec.e_cpos)); + ctxt->need_right = !!((le32_to_cpu(old_ent->e_rec.e_cpos) + + le32_to_cpu(old_ent->e_rec.e_clusters)) > + (le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters))); + ret = -EAGAIN; + if (ctxt->need_left) { + if (!ctxt->left_ent) + goto out_unlock; + *(ctxt->left_ent) = *old_ent; + ctxt->left_ent->e_rec.e_clusters = + cpu_to_le32(le32_to_cpu(rec->e_cpos) - + le32_to_cpu(ctxt->left_ent->e_rec.e_cpos)); + } + if (ctxt->need_right) { + if (!ctxt->right_ent) + goto out_unlock; + *(ctxt->right_ent) = *old_ent; + ctxt->right_ent->e_rec.e_cpos = + cpu_to_le32(le32_to_cpu(rec->e_cpos) + + le32_to_cpu(rec->e_clusters)); + ctxt->right_ent->e_rec.e_clusters = + cpu_to_le32((le32_to_cpu(old_ent->e_rec.e_cpos) + + le32_to_cpu(old_ent->e_rec.e_clusters)) - + le32_to_cpu(ctxt->right_ent->e_rec.e_cpos)); + } + + rb_erase(&old_ent->e_node, &em->em_extents); + /* Now that he's erased, set him up for deletion */ + ctxt->old_ent = old_ent; + + if (ctxt->need_left) { + ret = ocfs2_extent_map_insert_entry(em, + ctxt->left_ent); + if (ret) + goto out_unlock; + ctxt->left_ent = NULL; + } + + if (ctxt->need_right) { + ret = ocfs2_extent_map_insert_entry(em, + ctxt->right_ent); + if (ret) + goto out_unlock; + ctxt->right_ent = NULL; + } + + ret = ocfs2_extent_map_insert_entry(em, ctxt->new_ent); + + if (!ret) + ctxt->new_ent = NULL; + +out_unlock: + spin_unlock(&OCFS2_I(inode)->ip_lock); + + return ret; +} + + +static int ocfs2_extent_map_insert(struct inode *inode, + struct ocfs2_extent_rec *rec, + int tree_depth) +{ + int ret; + struct ocfs2_em_insert_context ctxt = {0, }; + + if ((le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters)) > + OCFS2_I(inode)->ip_map.em_clusters) { + ret = -EBADR; + mlog_errno(ret); + return ret; + } + + /* Zero e_clusters means a truncated tail record. It better be EOF */ + if (!rec->e_clusters) { + if ((le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters)) != + OCFS2_I(inode)->ip_map.em_clusters) { + ret = -EBADR; + mlog_errno(ret); + return ret; + } + + /* Ignore the truncated tail */ + return 0; + } + + ret = -ENOMEM; + ctxt.new_ent = kmem_cache_alloc(ocfs2_em_ent_cachep, + GFP_KERNEL); + if (!ctxt.new_ent) { + mlog_errno(ret); + return ret; + } + + ctxt.new_ent->e_rec = *rec; + ctxt.new_ent->e_tree_depth = tree_depth; + + do { + ret = -ENOMEM; + if (ctxt.need_left && !ctxt.left_ent) { + ctxt.left_ent = + kmem_cache_alloc(ocfs2_em_ent_cachep, + GFP_KERNEL); + if (!ctxt.left_ent) + break; + } + if (ctxt.need_right && !ctxt.right_ent) { + ctxt.right_ent = + kmem_cache_alloc(ocfs2_em_ent_cachep, + GFP_KERNEL); + if (!ctxt.right_ent) + break; + } + + ret = ocfs2_extent_map_try_insert(inode, rec, + tree_depth, &ctxt); + } while (ret == -EAGAIN); + + if (ret < 0) + mlog_errno(ret); + + if (ctxt.left_ent) + kmem_cache_free(ocfs2_em_ent_cachep, ctxt.left_ent); + if (ctxt.right_ent) + kmem_cache_free(ocfs2_em_ent_cachep, ctxt.right_ent); + if (ctxt.old_ent) + kmem_cache_free(ocfs2_em_ent_cachep, ctxt.old_ent); + if (ctxt.new_ent) + kmem_cache_free(ocfs2_em_ent_cachep, ctxt.new_ent); + + return ret; +} + +/* + * Append this record to the tail of the extent map. It must be + * tree_depth 0. The record might be an extension of an existing + * record, and as such that needs to be handled. eg: + * + * Existing record in the extent map: + * + * cpos = 10, len = 10 + * |---------| + * + * New Record: + * + * cpos = 10, len = 20 + * |------------------| + * + * The passed record is the new on-disk record. The new_clusters value + * is how many clusters were added to the file. If the append is a + * contiguous append, the new_clusters has been added to + * rec->e_clusters. If the append is an entirely new extent, then + * rec->e_clusters is == new_clusters. + */ +int ocfs2_extent_map_append(struct inode *inode, + struct ocfs2_extent_rec *rec, + u32 new_clusters) +{ + int ret; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent; + struct ocfs2_extent_rec *old; + + BUG_ON(!new_clusters); + BUG_ON(le32_to_cpu(rec->e_clusters) < new_clusters); + + if (em->em_clusters < OCFS2_I(inode)->ip_clusters) { + /* + * Size changed underneath us on disk. Drop any + * straddling records and update our idea of + * i_clusters + */ + ocfs2_extent_map_drop(inode, em->em_clusters - 1); + em->em_clusters = OCFS2_I(inode)->ip_clusters; + } + + mlog_bug_on_msg((le32_to_cpu(rec->e_cpos) + + le32_to_cpu(rec->e_clusters)) != + (em->em_clusters + new_clusters), + "Inode %"MLFu64":\n" + "rec->e_cpos = %u + rec->e_clusters = %u = %u\n" + "em->em_clusters = %u + new_clusters = %u = %u\n", + OCFS2_I(inode)->ip_blkno, + le32_to_cpu(rec->e_cpos), le32_to_cpu(rec->e_clusters), + le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters), + em->em_clusters, new_clusters, + em->em_clusters + new_clusters); + + em->em_clusters += new_clusters; + + ret = -ENOENT; + if (le32_to_cpu(rec->e_clusters) > new_clusters) { + /* This is a contiguous append */ + ent = ocfs2_extent_map_lookup(em, le32_to_cpu(rec->e_cpos), 1, + NULL, NULL); + if (ent) { + old = &ent->e_rec; + BUG_ON((le32_to_cpu(rec->e_cpos) + + le32_to_cpu(rec->e_clusters)) != + (le32_to_cpu(old->e_cpos) + + le32_to_cpu(old->e_clusters) + + new_clusters)); + if (ent->e_tree_depth == 0) { + BUG_ON(le32_to_cpu(old->e_cpos) != + le32_to_cpu(rec->e_cpos)); + BUG_ON(le64_to_cpu(old->e_blkno) != + le64_to_cpu(rec->e_blkno)); + ret = 0; + } + /* + * Let non-leafs fall through as -ENOENT to + * force insertion of the new leaf. + */ + le32_add_cpu(&old->e_clusters, new_clusters); + } + } + + if (ret == -ENOENT) + ret = ocfs2_extent_map_insert(inode, rec, 0); + if (ret < 0) + mlog_errno(ret); + return ret; +} + +#if 0 +/* Code here is included but defined out as it completes the extent + * map api and may be used in the future. */ + +/* + * Look up the record containing this cluster offset. This record is + * part of the extent map. Do not free it. Any changes you make to + * it will reflect in the extent map. So, if your last extent + * is (cpos = 10, clusters = 10) and you truncate the file by 5 + * clusters, you can do: + * + * ret = ocfs2_extent_map_get_rec(em, orig_size - 5, &rec); + * rec->e_clusters -= 5; + * + * The lookup does not read from disk. If the map isn't filled in for + * an entry, you won't find it. + * + * Also note that the returned record is valid until alloc_sem is + * dropped. After that, truncate and extend can happen. Caveat Emptor. + */ +int ocfs2_extent_map_get_rec(struct inode *inode, u32 cpos, + struct ocfs2_extent_rec **rec, + int *tree_depth) +{ + int ret = -ENOENT; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent; + + *rec = NULL; + + if (cpos >= OCFS2_I(inode)->ip_clusters) + return -EINVAL; + + if (cpos >= em->em_clusters) { + /* + * Size changed underneath us on disk. Drop any + * straddling records and update our idea of + * i_clusters + */ + ocfs2_extent_map_drop(inode, em->em_clusters - 1); + em->em_clusters = OCFS2_I(inode)->ip_clusters ; + } + + ent = ocfs2_extent_map_lookup(&OCFS2_I(inode)->ip_map, cpos, 1, + NULL, NULL); + + if (ent) { + *rec = &ent->e_rec; + if (tree_depth) + *tree_depth = ent->e_tree_depth; + ret = 0; + } + + return ret; +} + +int ocfs2_extent_map_get_clusters(struct inode *inode, + u32 v_cpos, int count, + u32 *p_cpos, int *ret_count) +{ + int ret; + u32 coff, ccount; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent = NULL; + + *p_cpos = ccount = 0; + + if ((v_cpos + count) > OCFS2_I(inode)->ip_clusters) + return -EINVAL; + + if ((v_cpos + count) > em->em_clusters) { + /* + * Size changed underneath us on disk. Drop any + * straddling records and update our idea of + * i_clusters + */ + ocfs2_extent_map_drop(inode, em->em_clusters - 1); + em->em_clusters = OCFS2_I(inode)->ip_clusters; + } + + + ret = ocfs2_extent_map_lookup_read(inode, v_cpos, count, &ent); + if (ret) + return ret; + + if (ent) { + /* We should never find ourselves straddling an interval */ + if (!ocfs2_extent_rec_contains_clusters(&ent->e_rec, + v_cpos, + count)) + return -ESRCH; + + coff = v_cpos - le32_to_cpu(ent->e_rec.e_cpos); + *p_cpos = ocfs2_blocks_to_clusters(inode->i_sb, + le64_to_cpu(ent->e_rec.e_blkno)) + + coff; + + if (ret_count) + *ret_count = le32_to_cpu(ent->e_rec.e_clusters) - coff; + + return 0; + } + + + return -ENOENT; +} + +#endif /* 0 */ + +int ocfs2_extent_map_get_blocks(struct inode *inode, + u64 v_blkno, int count, + u64 *p_blkno, int *ret_count) +{ + int ret; + u64 boff; + u32 cpos, clusters; + int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); + struct ocfs2_extent_map_entry *ent = NULL; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_rec *rec; + + *p_blkno = 0; + + cpos = ocfs2_blocks_to_clusters(inode->i_sb, v_blkno); + clusters = ocfs2_blocks_to_clusters(inode->i_sb, + (u64)count + bpc - 1); + if ((cpos + clusters) > OCFS2_I(inode)->ip_clusters) { + ret = -EINVAL; + mlog_errno(ret); + return ret; + } + + if ((cpos + clusters) > em->em_clusters) { + /* + * Size changed underneath us on disk. Drop any + * straddling records and update our idea of + * i_clusters + */ + ocfs2_extent_map_drop(inode, em->em_clusters - 1); + em->em_clusters = OCFS2_I(inode)->ip_clusters; + } + + ret = ocfs2_extent_map_lookup_read(inode, cpos, clusters, &ent); + if (ret) { + mlog_errno(ret); + return ret; + } + + if (ent) + { + rec = &ent->e_rec; + + /* We should never find ourselves straddling an interval */ + if (!ocfs2_extent_rec_contains_clusters(rec, cpos, clusters)) { + ret = -ESRCH; + mlog_errno(ret); + return ret; + } + + boff = ocfs2_clusters_to_blocks(inode->i_sb, cpos - + le32_to_cpu(rec->e_cpos)); + boff += (v_blkno & (u64)(bpc - 1)); + *p_blkno = le64_to_cpu(rec->e_blkno) + boff; + + if (ret_count) { + *ret_count = ocfs2_clusters_to_blocks(inode->i_sb, + le32_to_cpu(rec->e_clusters)) - boff; + } + + return 0; + } + + return -ENOENT; +} + +int ocfs2_extent_map_init(struct inode *inode) +{ + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + + em->em_extents = RB_ROOT; + em->em_clusters = 0; + + return 0; +} + +/* Needs the lock */ +static void __ocfs2_extent_map_drop(struct inode *inode, + u32 new_clusters, + struct rb_node **free_head, + struct ocfs2_extent_map_entry **tail_ent) +{ + struct rb_node *node, *next; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent; + + *free_head = NULL; + + ent = NULL; + node = rb_last(&em->em_extents); + while (node) + { + next = rb_prev(node); + + ent = rb_entry(node, struct ocfs2_extent_map_entry, + e_node); + if (le32_to_cpu(ent->e_rec.e_cpos) < new_clusters) + break; + + rb_erase(&ent->e_node, &em->em_extents); + + node->rb_right = *free_head; + *free_head = node; + + ent = NULL; + node = next; + } + + /* Do we have an entry straddling new_clusters? */ + if (tail_ent) { + if (ent && + ((le32_to_cpu(ent->e_rec.e_cpos) + + le32_to_cpu(ent->e_rec.e_clusters)) > new_clusters)) + *tail_ent = ent; + else + *tail_ent = NULL; + } +} + +static void __ocfs2_extent_map_drop_cleanup(struct rb_node *free_head) +{ + struct rb_node *node; + struct ocfs2_extent_map_entry *ent; + + while (free_head) { + node = free_head; + free_head = node->rb_right; + + ent = rb_entry(node, struct ocfs2_extent_map_entry, + e_node); + kmem_cache_free(ocfs2_em_ent_cachep, ent); + } +} + +/* + * Remove all entries past new_clusters, inclusive of an entry that + * contains new_clusters. This is effectively a cache forget. + * + * If you want to also clip the last extent by some number of clusters, + * you need to call ocfs2_extent_map_trunc(). + * This code does not check or modify ip_clusters. + */ +int ocfs2_extent_map_drop(struct inode *inode, u32 new_clusters) +{ + struct rb_node *free_head = NULL; + struct ocfs2_extent_map *em = &OCFS2_I(inode)->ip_map; + struct ocfs2_extent_map_entry *ent; + + spin_lock(&OCFS2_I(inode)->ip_lock); + + __ocfs2_extent_map_drop(inode, new_clusters, &free_head, &ent); + + if (ent) { + rb_erase(&ent->e_node, &em->em_extents); + ent->e_node.rb_right = free_head; + free_head = &ent->e_node; + } + + spin_unlock(&OCFS2_I(inode)->ip_lock); + + if (free_head) + __ocfs2_extent_map_drop_cleanup(free_head); + + return 0; +} + +/* + * Remove all entries past new_clusters and also clip any extent + * straddling new_clusters, if there is one. This does not check + * or modify ip_clusters + */ +int ocfs2_extent_map_trunc(struct inode *inode, u32 new_clusters) +{ + struct rb_node *free_head = NULL; + struct ocfs2_extent_map_entry *ent = NULL; + + spin_lock(&OCFS2_I(inode)->ip_lock); + + __ocfs2_extent_map_drop(inode, new_clusters, &free_head, &ent); + + if (ent) + ent->e_rec.e_clusters = cpu_to_le32(new_clusters - + le32_to_cpu(ent->e_rec.e_cpos)); + + OCFS2_I(inode)->ip_map.em_clusters = new_clusters; + + spin_unlock(&OCFS2_I(inode)->ip_lock); + + if (free_head) + __ocfs2_extent_map_drop_cleanup(free_head); + + return 0; +} + +int __init init_ocfs2_extent_maps(void) +{ + ocfs2_em_ent_cachep = + kmem_cache_create("ocfs2_em_ent", + sizeof(struct ocfs2_extent_map_entry), + 0, SLAB_HWCACHE_ALIGN, NULL, NULL); + if (!ocfs2_em_ent_cachep) + return -ENOMEM; + + return 0; +} + +void __exit exit_ocfs2_extent_maps(void) +{ + kmem_cache_destroy(ocfs2_em_ent_cachep); +} diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h new file mode 100644 index 0000000..fa3745e --- /dev/null +++ b/fs/ocfs2/extent_map.h @@ -0,0 +1,46 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * extent_map.h + * + * In-memory file extent mappings for OCFS2. + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _EXTENT_MAP_H +#define _EXTENT_MAP_H + +int init_ocfs2_extent_maps(void); +void exit_ocfs2_extent_maps(void); + +/* + * EVERY CALL here except _init, _trunc, and _drop expects alloc_sem + * to be held. The allocation cannot change at all while the map is + * in the process of being updated. + */ +int ocfs2_extent_map_init(struct inode *inode); +int ocfs2_extent_map_append(struct inode *inode, + struct ocfs2_extent_rec *rec, + u32 new_clusters); +int ocfs2_extent_map_get_blocks(struct inode *inode, + u64 v_blkno, int count, + u64 *p_blkno, int *ret_count); +int ocfs2_extent_map_drop(struct inode *inode, u32 new_clusters); +int ocfs2_extent_map_trunc(struct inode *inode, u32 new_clusters); + +#endif /* _EXTENT_MAP_H */ diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c new file mode 100644 index 0000000..72ae9e3 --- /dev/null +++ b/fs/ocfs2/file.c @@ -0,0 +1,1237 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * file.c + * + * File open, close, extend, truncate + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/uio.h> + +#define MLOG_MASK_PREFIX ML_INODE +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "aops.h" +#include "dir.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "sysfile.h" +#include "inode.h" +#include "journal.h" +#include "mmap.h" +#include "suballoc.h" +#include "super.h" + +#include "buffer_head_io.h" + +static int ocfs2_sync_inode(struct inode *inode) +{ + filemap_fdatawrite(inode->i_mapping); + return sync_mapping_buffers(inode->i_mapping); +} + +static int ocfs2_file_open(struct inode *inode, struct file *file) +{ + int status; + int mode = file->f_flags; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, + file->f_dentry->d_name.len, file->f_dentry->d_name.name); + + spin_lock(&oi->ip_lock); + + /* Check that the inode hasn't been wiped from disk by another + * node. If it hasn't then we're safe as long as we hold the + * spin lock until our increment of open count. */ + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { + spin_unlock(&oi->ip_lock); + + status = -ENOENT; + goto leave; + } + + if (mode & O_DIRECT) + oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; + + oi->ip_open_count++; + spin_unlock(&oi->ip_lock); + status = 0; +leave: + mlog_exit(status); + return status; +} + +static int ocfs2_file_release(struct inode *inode, struct file *file) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, + file->f_dentry->d_name.len, + file->f_dentry->d_name.name); + + spin_lock(&oi->ip_lock); + if (!--oi->ip_open_count) + oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; + spin_unlock(&oi->ip_lock); + + mlog_exit(0); + + return 0; +} + +static int ocfs2_sync_file(struct file *file, + struct dentry *dentry, + int datasync) +{ + int err = 0; + journal_t *journal; + struct inode *inode = dentry->d_inode; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, + dentry->d_name.len, dentry->d_name.name); + + err = ocfs2_sync_inode(dentry->d_inode); + if (err) + goto bail; + + journal = osb->journal->j_journal; + err = journal_force_commit(journal); + +bail: + mlog_exit(err); + + return (err < 0) ? -EIO : 0; +} + +int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 new_i_size) +{ + int status; + + mlog_entry_void(); + i_size_write(inode, new_i_size); + inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); + inode->i_ctime = inode->i_mtime = CURRENT_TIME; + + status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_simple_size_update(struct inode *inode, + struct buffer_head *di_bh, + u64 new_i_size) +{ + int ret; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_journal_handle *handle = NULL; + + handle = ocfs2_start_trans(osb, NULL, + OCFS2_INODE_UPDATE_CREDITS); + if (handle == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_set_inode_size(handle, inode, di_bh, + new_i_size); + if (ret < 0) + mlog_errno(ret); + + ocfs2_commit_trans(handle); +out: + return ret; +} + +static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh, + u64 new_i_size) +{ + int status; + struct ocfs2_journal_handle *handle; + + mlog_entry_void(); + + /* TODO: This needs to actually orphan the inode in this + * transaction. */ + + handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto out; + } + + status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size); + if (status < 0) + mlog_errno(status); + + ocfs2_commit_trans(handle); +out: + mlog_exit(status); + return status; +} + +static int ocfs2_truncate_file(struct inode *inode, + struct buffer_head *di_bh, + u64 new_i_size) +{ + int status = 0; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_truncate_context *tc = NULL; + + mlog_entry("(inode = %"MLFu64", new_i_size = %"MLFu64"\n", + OCFS2_I(inode)->ip_blkno, new_i_size); + + truncate_inode_pages(inode->i_mapping, new_i_size); + + fe = (struct ocfs2_dinode *) di_bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); + status = -EIO; + goto bail; + } + + mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), + "Inode %"MLFu64", inode i_size = %lld != di " + "i_size = %"MLFu64", i_flags = 0x%x\n", + OCFS2_I(inode)->ip_blkno, + i_size_read(inode), + le64_to_cpu(fe->i_size), le32_to_cpu(fe->i_flags)); + + if (new_i_size > le64_to_cpu(fe->i_size)) { + mlog(0, "asked to truncate file with size (%"MLFu64") " + "to size (%"MLFu64")!\n", + le64_to_cpu(fe->i_size), new_i_size); + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + mlog(0, "inode %"MLFu64", i_size = %"MLFu64", new_i_size = %"MLFu64"\n", + le64_to_cpu(fe->i_blkno), le64_to_cpu(fe->i_size), new_i_size); + + /* lets handle the simple truncate cases before doing any more + * cluster locking. */ + if (new_i_size == le64_to_cpu(fe->i_size)) + goto bail; + + if (le32_to_cpu(fe->i_clusters) == + ocfs2_clusters_for_bytes(osb->sb, new_i_size)) { + mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n", + fe->i_clusters); + /* No allocation change is required, so lets fast path + * this truncate. */ + status = ocfs2_simple_size_update(inode, di_bh, new_i_size); + if (status < 0) + mlog_errno(status); + goto bail; + } + + /* This forces other nodes to sync and drop their pages */ + status = ocfs2_data_lock(inode, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + ocfs2_data_unlock(inode, 1); + + /* alright, we're going to need to do a full blown alloc size + * change. Orphan the inode so that recovery can complete the + * truncate if necessary. This does the task of marking + * i_size. */ + status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_commit_truncate(osb, inode, di_bh, tc); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* TODO: orphan dir cleanup here. */ +bail: + + mlog_exit(status); + return status; +} + +/* + * extend allocation only here. + * we'll update all the disk stuff, and oip->alloc_size + * + * expect stuff to be locked, a transaction started and enough data / + * metadata reservations in the contexts. + * + * Will return -EAGAIN, and a reason if a restart is needed. + * If passed in, *reason will always be set, even in error. + */ +int ocfs2_do_extend_allocation(struct ocfs2_super *osb, + struct inode *inode, + u32 clusters_to_add, + struct buffer_head *fe_bh, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + enum ocfs2_alloc_restarted *reason_ret) +{ + int status = 0; + int free_extents; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; + enum ocfs2_alloc_restarted reason = RESTART_NONE; + u32 bit_off, num_bits; + u64 block; + + BUG_ON(!clusters_to_add); + + free_extents = ocfs2_num_free_extents(osb, inode, fe); + if (free_extents < 0) { + status = free_extents; + mlog_errno(status); + goto leave; + } + + /* there are two cases which could cause us to EAGAIN in the + * we-need-more-metadata case: + * 1) we haven't reserved *any* + * 2) we are so fragmented, we've needed to add metadata too + * many times. */ + if (!free_extents && !meta_ac) { + mlog(0, "we haven't reserved any metadata!\n"); + status = -EAGAIN; + reason = RESTART_META; + goto leave; + } else if ((!free_extents) + && (ocfs2_alloc_context_bits_left(meta_ac) + < ocfs2_extend_meta_needed(fe))) { + mlog(0, "filesystem is really fragmented...\n"); + status = -EAGAIN; + reason = RESTART_META; + goto leave; + } + + status = ocfs2_claim_clusters(osb, handle, data_ac, 1, + &bit_off, &num_bits); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + BUG_ON(num_bits > clusters_to_add); + + /* reserve our write early -- insert_extent may update the inode */ + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + block = ocfs2_clusters_to_blocks(osb->sb, bit_off); + mlog(0, "Allocating %u clusters at block %u for inode %"MLFu64"\n", + num_bits, bit_off, OCFS2_I(inode)->ip_blkno); + status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block, + num_bits, meta_ac); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + le32_add_cpu(&fe->i_clusters, num_bits); + spin_lock(&OCFS2_I(inode)->ip_lock); + OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + spin_unlock(&OCFS2_I(inode)->ip_lock); + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + clusters_to_add -= num_bits; + + if (clusters_to_add) { + mlog(0, "need to alloc once more, clusters = %u, wanted = " + "%u\n", fe->i_clusters, clusters_to_add); + status = -EAGAIN; + reason = RESTART_TRANS; + } + +leave: + mlog_exit(status); + if (reason_ret) + *reason_ret = reason; + return status; +} + +static int ocfs2_extend_allocation(struct inode *inode, + u32 clusters_to_add) +{ + int status = 0; + int restart_func = 0; + int drop_alloc_sem = 0; + int credits, num_free_extents; + u32 prev_clusters; + struct buffer_head *bh = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_alloc_context *data_ac = NULL; + struct ocfs2_alloc_context *meta_ac = NULL; + enum ocfs2_alloc_restarted why; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); + + status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, + OCFS2_BH_CACHED, inode); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + fe = (struct ocfs2_dinode *) bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); + status = -EIO; + goto leave; + } + +restart_all: + BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); + + mlog(0, "extend inode %"MLFu64", i_size = %lld, fe->i_clusters = %u, " + "clusters_to_add = %u\n", + OCFS2_I(inode)->ip_blkno, i_size_read(inode), + fe->i_clusters, clusters_to_add); + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + + num_free_extents = ocfs2_num_free_extents(osb, + inode, + fe); + if (num_free_extents < 0) { + status = num_free_extents; + mlog_errno(status); + goto leave; + } + + if (!num_free_extents) { + status = ocfs2_reserve_new_metadata(osb, + handle, + fe, + &meta_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + } + + status = ocfs2_reserve_clusters(osb, + handle, + clusters_to_add, + &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + /* blocks peope in read/write from reading our allocation + * until we're done changing it. We depend on i_sem to block + * other extend/truncate calls while we're here. Ordering wrt + * start_trans is important here -- always do it before! */ + down_write(&OCFS2_I(inode)->ip_alloc_sem); + drop_alloc_sem = 1; + + credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); + handle = ocfs2_start_trans(osb, handle, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto leave; + } + +restarted_transaction: + /* reserve a write to the file entry early on - that we if we + * run out of credits in the allocation path, we can still + * update i_size. */ + status = ocfs2_journal_access(handle, inode, bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + prev_clusters = OCFS2_I(inode)->ip_clusters; + + status = ocfs2_do_extend_allocation(osb, + inode, + clusters_to_add, + bh, + handle, + data_ac, + meta_ac, + &why); + if ((status < 0) && (status != -EAGAIN)) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_dirty(handle, bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + spin_lock(&OCFS2_I(inode)->ip_lock); + clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); + spin_unlock(&OCFS2_I(inode)->ip_lock); + + if (why != RESTART_NONE && clusters_to_add) { + if (why == RESTART_META) { + mlog(0, "restarting function.\n"); + restart_func = 1; + } else { + BUG_ON(why != RESTART_TRANS); + + mlog(0, "restarting transaction.\n"); + /* TODO: This can be more intelligent. */ + credits = ocfs2_calc_extend_credits(osb->sb, + fe, + clusters_to_add); + status = ocfs2_extend_trans(handle, credits); + if (status < 0) { + /* handle still has to be committed at + * this point. */ + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + goto restarted_transaction; + } + } + + mlog(0, "fe: i_clusters = %u, i_size=%"MLFu64"\n", + fe->i_clusters, fe->i_size); + mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", + OCFS2_I(inode)->ip_clusters, i_size_read(inode)); + +leave: + if (drop_alloc_sem) { + up_write(&OCFS2_I(inode)->ip_alloc_sem); + drop_alloc_sem = 0; + } + if (handle) { + ocfs2_commit_trans(handle); + handle = NULL; + } + if (data_ac) { + ocfs2_free_alloc_context(data_ac); + data_ac = NULL; + } + if (meta_ac) { + ocfs2_free_alloc_context(meta_ac); + meta_ac = NULL; + } + if ((!status) && restart_func) { + restart_func = 0; + goto restart_all; + } + if (bh) { + brelse(bh); + bh = NULL; + } + + mlog_exit(status); + return status; +} + +/* Some parts of this taken from generic_cont_expand, which turned out + * to be too fragile to do exactly what we need without us having to + * worry about recursive locking in ->commit_write(). */ +static int ocfs2_write_zero_page(struct inode *inode, + u64 size) +{ + struct address_space *mapping = inode->i_mapping; + struct page *page; + unsigned long index; + unsigned int offset; + struct ocfs2_journal_handle *handle = NULL; + int ret; + + offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ + /* ugh. in prepare/commit_write, if from==to==start of block, we + ** skip the prepare. make sure we never send an offset for the start + ** of a block + */ + if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { + offset++; + } + index = size >> PAGE_CACHE_SHIFT; + + page = grab_cache_page(mapping, index); + if (!page) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_prepare_write(NULL, page, offset, offset); + if (ret < 0) { + mlog_errno(ret); + goto out_unlock; + } + + if (ocfs2_should_order_data(inode)) { + handle = ocfs2_start_walk_page_trans(inode, page, offset, + offset); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + handle = NULL; + goto out_unlock; + } + } + + /* must not update i_size! */ + ret = block_commit_write(page, offset, offset); + if (ret < 0) + mlog_errno(ret); + else + ret = 0; + + if (handle) + ocfs2_commit_trans(handle); +out_unlock: + unlock_page(page); + page_cache_release(page); +out: + return ret; +} + +static int ocfs2_zero_extend(struct inode *inode, + u64 zero_to_size) +{ + int ret = 0; + u64 start_off; + struct super_block *sb = inode->i_sb; + + start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); + while (start_off < zero_to_size) { + ret = ocfs2_write_zero_page(inode, start_off); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + start_off += sb->s_blocksize; + } + +out: + return ret; +} + +static int ocfs2_extend_file(struct inode *inode, + struct buffer_head *di_bh, + u64 new_i_size) +{ + int ret = 0; + u32 clusters_to_add; + + /* setattr sometimes calls us like this. */ + if (new_i_size == 0) + goto out; + + if (i_size_read(inode) == new_i_size) + goto out; + BUG_ON(new_i_size < i_size_read(inode)); + + clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - + OCFS2_I(inode)->ip_clusters; + + if (clusters_to_add) { + ret = ocfs2_extend_allocation(inode, clusters_to_add); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_zero_extend(inode, new_i_size); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + /* No allocation required, we just use this helper to + * do a trivial update of i_size. */ + ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + +out: + return ret; +} + +int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) +{ + int status = 0, size_change; + struct inode *inode = dentry->d_inode; + struct super_block *sb = inode->i_sb; + struct ocfs2_super *osb = OCFS2_SB(sb); + struct buffer_head *bh = NULL; + struct ocfs2_journal_handle *handle = NULL; + + mlog_entry("(0x%p, '%.*s')\n", dentry, + dentry->d_name.len, dentry->d_name.name); + + if (attr->ia_valid & ATTR_MODE) + mlog(0, "mode change: %d\n", attr->ia_mode); + if (attr->ia_valid & ATTR_UID) + mlog(0, "uid change: %d\n", attr->ia_uid); + if (attr->ia_valid & ATTR_GID) + mlog(0, "gid change: %d\n", attr->ia_gid); + if (attr->ia_valid & ATTR_SIZE) + mlog(0, "size change...\n"); + if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) + mlog(0, "time change...\n"); + +#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ + | ATTR_GID | ATTR_UID | ATTR_MODE) + if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { + mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); + return 0; + } + + status = inode_change_ok(inode, attr); + if (status) + return status; + + size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; + if (size_change) { + status = ocfs2_rw_lock(inode, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_meta_lock(inode, NULL, &bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail_unlock_rw; + } + + if (size_change && attr->ia_size != i_size_read(inode)) { + if (i_size_read(inode) > attr->ia_size) + status = ocfs2_truncate_file(inode, bh, attr->ia_size); + else + status = ocfs2_extend_file(inode, bh, attr->ia_size); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + status = -ENOSPC; + goto bail_unlock; + } + } + + handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto bail_unlock; + } + + status = inode_setattr(inode, attr); + if (status < 0) { + mlog_errno(status); + goto bail_commit; + } + + status = ocfs2_mark_inode_dirty(handle, inode, bh); + if (status < 0) + mlog_errno(status); + +bail_commit: + ocfs2_commit_trans(handle); +bail_unlock: + ocfs2_meta_unlock(inode, 1); +bail_unlock_rw: + if (size_change) + ocfs2_rw_unlock(inode, 1); +bail: + if (bh) + brelse(bh); + + mlog_exit(status); + return status; +} + +int ocfs2_getattr(struct vfsmount *mnt, + struct dentry *dentry, + struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + struct super_block *sb = dentry->d_inode->i_sb; + struct ocfs2_super *osb = sb->s_fs_info; + int err; + + mlog_entry_void(); + + err = ocfs2_inode_revalidate(dentry); + if (err) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + + generic_fillattr(inode, stat); + + /* We set the blksize from the cluster size for performance */ + stat->blksize = osb->s_clustersize; + +bail: + mlog_exit(err); + + return err; +} + +static int ocfs2_write_remove_suid(struct inode *inode) +{ + int ret; + struct buffer_head *bh = NULL; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_journal_handle *handle; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_dinode *di; + + mlog_entry("(Inode %"MLFu64", mode 0%o)\n", oi->ip_blkno, + inode->i_mode); + + handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); + if (handle == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); + if (ret < 0) { + mlog_errno(ret); + goto out_trans; + } + + ret = ocfs2_journal_access(handle, inode, bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + mlog_errno(ret); + goto out_bh; + } + + inode->i_mode &= ~S_ISUID; + if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) + inode->i_mode &= ~S_ISGID; + + di = (struct ocfs2_dinode *) bh->b_data; + di->i_mode = cpu_to_le16(inode->i_mode); + + ret = ocfs2_journal_dirty(handle, bh); + if (ret < 0) + mlog_errno(ret); +out_bh: + brelse(bh); +out_trans: + ocfs2_commit_trans(handle); +out: + mlog_exit(ret); + return ret; +} + +static inline int ocfs2_write_should_remove_suid(struct inode *inode) +{ + mode_t mode = inode->i_mode; + + if (!capable(CAP_FSETID)) { + if (unlikely(mode & S_ISUID)) + return 1; + + if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) + return 1; + } + return 0; +} + +static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, + const char __user *buf, + size_t count, + loff_t pos) +{ + struct iovec local_iov = { .iov_base = (void __user *)buf, + .iov_len = count }; + int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0; + u32 clusters; + struct file *filp = iocb->ki_filp; + struct inode *inode = filp->f_dentry->d_inode; + loff_t newsize, saved_pos; +#ifdef OCFS2_ORACORE_WORKAROUNDS + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); +#endif + + mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, + (unsigned int)count, + filp->f_dentry->d_name.len, + filp->f_dentry->d_name.name); + + /* happy write of zero bytes */ + if (count == 0) + return 0; + + if (!inode) { + mlog(0, "bad inode\n"); + return -EIO; + } + +#ifdef OCFS2_ORACORE_WORKAROUNDS + /* ugh, work around some applications which open everything O_DIRECT + + * O_APPEND and really don't mean to use O_DIRECT. */ + if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS && + (filp->f_flags & O_APPEND) && (filp->f_flags & O_DIRECT)) + filp->f_flags &= ~O_DIRECT; +#endif + + down(&inode->i_sem); + /* to match setattr's i_sem -> i_alloc_sem -> rw_lock ordering */ + if (filp->f_flags & O_DIRECT) { + have_alloc_sem = 1; + down_read(&inode->i_alloc_sem); + } + + /* concurrent O_DIRECT writes are allowed */ + rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1; + ret = ocfs2_rw_lock(inode, rw_level); + if (ret < 0) { + rw_level = -1; + mlog_errno(ret); + goto out; + } + + /* + * We sample i_size under a read level meta lock to see if our write + * is extending the file, if it is we back off and get a write level + * meta lock. + */ + meta_level = (filp->f_flags & O_APPEND) ? 1 : 0; + for(;;) { + ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level); + if (ret < 0) { + meta_level = -1; + mlog_errno(ret); + goto out; + } + + /* Clear suid / sgid if necessary. We do this here + * instead of later in the write path because + * remove_suid() calls ->setattr without any hint that + * we may have already done our cluster locking. Since + * ocfs2_setattr() *must* take cluster locks to + * proceeed, this will lead us to recursively lock the + * inode. There's also the dinode i_size state which + * can be lost via setattr during extending writes (we + * set inode->i_size at the end of a write. */ + if (ocfs2_write_should_remove_suid(inode)) { + if (meta_level == 0) { + ocfs2_meta_unlock(inode, meta_level); + meta_level = 1; + continue; + } + + ret = ocfs2_write_remove_suid(inode); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + /* work on a copy of ppos until we're sure that we won't have + * to recalculate it due to relocking. */ + if (filp->f_flags & O_APPEND) { + saved_pos = i_size_read(inode); + mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); + } else { + saved_pos = iocb->ki_pos; + } + newsize = count + saved_pos; + + mlog(0, "pos=%lld newsize=%"MLFu64" cursize=%lld\n", + saved_pos, newsize, i_size_read(inode)); + + /* No need for a higher level metadata lock if we're + * never going past i_size. */ + if (newsize <= i_size_read(inode)) + break; + + if (meta_level == 0) { + ocfs2_meta_unlock(inode, meta_level); + meta_level = 1; + continue; + } + + spin_lock(&OCFS2_I(inode)->ip_lock); + clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - + OCFS2_I(inode)->ip_clusters; + spin_unlock(&OCFS2_I(inode)->ip_lock); + + mlog(0, "Writing at EOF, may need more allocation: " + "i_size = %lld, newsize = %"MLFu64", need %u clusters\n", + i_size_read(inode), newsize, clusters); + + /* We only want to continue the rest of this loop if + * our extend will actually require more + * allocation. */ + if (!clusters) + break; + + ret = ocfs2_extend_allocation(inode, clusters); + if (ret < 0) { + if (ret != -ENOSPC) + mlog_errno(ret); + goto out; + } + + /* Fill any holes which would've been created by this + * write. If we're O_APPEND, this will wind up + * (correctly) being a noop. */ + ret = ocfs2_zero_extend(inode, (u64) newsize - count); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + break; + } + + /* ok, we're done with i_size and alloc work */ + iocb->ki_pos = saved_pos; + ocfs2_meta_unlock(inode, meta_level); + meta_level = -1; + + /* communicate with ocfs2_dio_end_io */ + ocfs2_iocb_set_rw_locked(iocb); + +#ifdef OCFS2_ORACORE_WORKAROUNDS + if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS && + filp->f_flags & O_DIRECT) { + unsigned int saved_flags = filp->f_flags; + int sector_size = 1 << osb->s_sectsize_bits; + + if ((saved_pos & (sector_size - 1)) || + (count & (sector_size - 1)) || + ((unsigned long)buf & (sector_size - 1))) { + filp->f_flags |= O_SYNC; + filp->f_flags &= ~O_DIRECT; + } + + ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, + &iocb->ki_pos); + + filp->f_flags = saved_flags; + } else +#endif + ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, + &iocb->ki_pos); + + /* buffered aio wouldn't have proper lock coverage today */ + BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); + + /* + * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io + * function pointer which is called when o_direct io completes so that + * it can unlock our rw lock. (it's the clustered equivalent of + * i_alloc_sem; protects truncate from racing with pending ios). + * Unfortunately there are error cases which call end_io and others + * that don't. so we don't have to unlock the rw_lock if either an + * async dio is going to do it in the future or an end_io after an + * error has already done it. + */ + if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { + rw_level = -1; + have_alloc_sem = 0; + } + +out: + if (meta_level != -1) + ocfs2_meta_unlock(inode, meta_level); + if (have_alloc_sem) + up_read(&inode->i_alloc_sem); + if (rw_level != -1) + ocfs2_rw_unlock(inode, rw_level); + up(&inode->i_sem); + + mlog_exit(ret); + return ret; +} + +static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, + char __user *buf, + size_t count, + loff_t pos) +{ + int ret = 0, rw_level = -1, have_alloc_sem = 0; + struct file *filp = iocb->ki_filp; + struct inode *inode = filp->f_dentry->d_inode; +#ifdef OCFS2_ORACORE_WORKAROUNDS + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); +#endif + + mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, + (unsigned int)count, + filp->f_dentry->d_name.len, + filp->f_dentry->d_name.name); + + if (!inode) { + ret = -EINVAL; + mlog_errno(ret); + goto bail; + } + +#ifdef OCFS2_ORACORE_WORKAROUNDS + if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS) { + if (filp->f_flags & O_DIRECT) { + int sector_size = 1 << osb->s_sectsize_bits; + + if ((pos & (sector_size - 1)) || + (count & (sector_size - 1)) || + ((unsigned long)buf & (sector_size - 1)) || + (i_size_read(inode) & (sector_size -1))) { + filp->f_flags &= ~O_DIRECT; + } + } + } +#endif + + /* + * buffered reads protect themselves in ->readpage(). O_DIRECT reads + * need locks to protect pending reads from racing with truncate. + */ + if (filp->f_flags & O_DIRECT) { + down_read(&inode->i_alloc_sem); + have_alloc_sem = 1; + + ret = ocfs2_rw_lock(inode, 0); + if (ret < 0) { + mlog_errno(ret); + goto bail; + } + rw_level = 0; + /* communicate with ocfs2_dio_end_io */ + ocfs2_iocb_set_rw_locked(iocb); + } + + ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos); + if (ret == -EINVAL) + mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); + + /* buffered aio wouldn't have proper lock coverage today */ + BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); + + /* see ocfs2_file_aio_write */ + if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { + rw_level = -1; + have_alloc_sem = 0; + } + +bail: + if (have_alloc_sem) + up_read(&inode->i_alloc_sem); + if (rw_level != -1) + ocfs2_rw_unlock(inode, rw_level); + mlog_exit(ret); + + return ret; +} + +struct inode_operations ocfs2_file_iops = { + .setattr = ocfs2_setattr, + .getattr = ocfs2_getattr, +}; + +struct inode_operations ocfs2_special_file_iops = { + .setattr = ocfs2_setattr, + .getattr = ocfs2_getattr, +}; + +struct file_operations ocfs2_fops = { + .read = do_sync_read, + .write = do_sync_write, + .sendfile = generic_file_sendfile, + .mmap = ocfs2_mmap, + .fsync = ocfs2_sync_file, + .release = ocfs2_file_release, + .open = ocfs2_file_open, + .aio_read = ocfs2_file_aio_read, + .aio_write = ocfs2_file_aio_write, +}; + +struct file_operations ocfs2_dops = { + .read = generic_read_dir, + .readdir = ocfs2_readdir, + .fsync = ocfs2_sync_file, +}; diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h new file mode 100644 index 0000000..a5ea33b --- /dev/null +++ b/fs/ocfs2/file.h @@ -0,0 +1,57 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * file.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_FILE_H +#define OCFS2_FILE_H + +extern struct file_operations ocfs2_fops; +extern struct file_operations ocfs2_dops; +extern struct inode_operations ocfs2_file_iops; +extern struct inode_operations ocfs2_special_file_iops; +struct ocfs2_alloc_context; + +enum ocfs2_alloc_restarted { + RESTART_NONE = 0, + RESTART_TRANS, + RESTART_META +}; +int ocfs2_do_extend_allocation(struct ocfs2_super *osb, + struct inode *inode, + u32 clusters_to_add, + struct buffer_head *fe_bh, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + enum ocfs2_alloc_restarted *reason); +int ocfs2_setattr(struct dentry *dentry, struct iattr *attr); +int ocfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat); + +int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *fe_bh, + u64 new_i_size); + +#endif /* OCFS2_FILE_H */ diff --git a/fs/ocfs2/heartbeat.c b/fs/ocfs2/heartbeat.c new file mode 100644 index 0000000..0bbd22f --- /dev/null +++ b/fs/ocfs2/heartbeat.c @@ -0,0 +1,378 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * heartbeat.c + * + * Register ourselves with the heartbaet service, keep our node maps + * up to date, and fire off recovery when needed. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/kmod.h> + +#include <cluster/heartbeat.h> +#include <cluster/nodemanager.h> + +#include <dlm/dlmapi.h> + +#define MLOG_MASK_PREFIX ML_SUPER +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "heartbeat.h" +#include "inode.h" +#include "journal.h" +#include "vote.h" + +#include "buffer_head_io.h" + +#define OCFS2_HB_NODE_DOWN_PRI (0x0000002) +#define OCFS2_HB_NODE_UP_PRI OCFS2_HB_NODE_DOWN_PRI + +static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map, + int bit); +static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map, + int bit); +static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map); +static void __ocfs2_node_map_dup(struct ocfs2_node_map *target, + struct ocfs2_node_map *from); +static void __ocfs2_node_map_set(struct ocfs2_node_map *target, + struct ocfs2_node_map *from); + +void ocfs2_init_node_maps(struct ocfs2_super *osb) +{ + spin_lock_init(&osb->node_map_lock); + ocfs2_node_map_init(&osb->mounted_map); + ocfs2_node_map_init(&osb->recovery_map); + ocfs2_node_map_init(&osb->umount_map); +} + +static void ocfs2_do_node_down(int node_num, + struct ocfs2_super *osb) +{ + BUG_ON(osb->node_num == node_num); + + mlog(0, "ocfs2: node down event for %d\n", node_num); + + if (!osb->dlm) { + /* + * No DLM means we're not even ready to participate yet. + * We check the slots after the DLM comes up, so we will + * notice the node death then. We can safely ignore it + * here. + */ + return; + } + + if (ocfs2_node_map_test_bit(osb, &osb->umount_map, node_num)) { + /* If a node is in the umount map, then we've been + * expecting him to go down and we know ahead of time + * that recovery is not necessary. */ + ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num); + return; + } + + ocfs2_recovery_thread(osb, node_num); + + ocfs2_remove_node_from_vote_queues(osb, node_num); +} + +static void ocfs2_hb_node_down_cb(struct o2nm_node *node, + int node_num, + void *data) +{ + ocfs2_do_node_down(node_num, (struct ocfs2_super *) data); +} + +/* Called from the dlm when it's about to evict a node. We may also + * get a heartbeat callback later. */ +static void ocfs2_dlm_eviction_cb(int node_num, + void *data) +{ + struct ocfs2_super *osb = (struct ocfs2_super *) data; + struct super_block *sb = osb->sb; + + mlog(ML_NOTICE, "device (%u,%u): dlm has evicted node %d\n", + MAJOR(sb->s_dev), MINOR(sb->s_dev), node_num); + + ocfs2_do_node_down(node_num, osb); +} + +static void ocfs2_hb_node_up_cb(struct o2nm_node *node, + int node_num, + void *data) +{ + struct ocfs2_super *osb = data; + + BUG_ON(osb->node_num == node_num); + + mlog(0, "node up event for %d\n", node_num); + ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num); +} + +void ocfs2_setup_hb_callbacks(struct ocfs2_super *osb) +{ + o2hb_setup_callback(&osb->osb_hb_down, O2HB_NODE_DOWN_CB, + ocfs2_hb_node_down_cb, osb, + OCFS2_HB_NODE_DOWN_PRI); + + o2hb_setup_callback(&osb->osb_hb_up, O2HB_NODE_UP_CB, + ocfs2_hb_node_up_cb, osb, OCFS2_HB_NODE_UP_PRI); + + /* Not exactly a heartbeat callback, but leads to essentially + * the same path so we set it up here. */ + dlm_setup_eviction_cb(&osb->osb_eviction_cb, + ocfs2_dlm_eviction_cb, + osb); +} + +/* Most functions here are just stubs for now... */ +int ocfs2_register_hb_callbacks(struct ocfs2_super *osb) +{ + int status; + + status = o2hb_register_callback(&osb->osb_hb_down); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = o2hb_register_callback(&osb->osb_hb_up); + if (status < 0) + mlog_errno(status); + +bail: + return status; +} + +void ocfs2_clear_hb_callbacks(struct ocfs2_super *osb) +{ + int status; + + status = o2hb_unregister_callback(&osb->osb_hb_down); + if (status < 0) + mlog_errno(status); + + status = o2hb_unregister_callback(&osb->osb_hb_up); + if (status < 0) + mlog_errno(status); +} + +void ocfs2_stop_heartbeat(struct ocfs2_super *osb) +{ + int ret; + char *argv[5], *envp[3]; + + if (!osb->uuid_str) { + /* This can happen if we don't get far enough in mount... */ + mlog(0, "No UUID with which to stop heartbeat!\n\n"); + return; + } + + argv[0] = (char *)o2nm_get_hb_ctl_path(); + argv[1] = "-K"; + argv[2] = "-u"; + argv[3] = osb->uuid_str; + argv[4] = NULL; + + mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]); + + /* minimal command environment taken from cpu_run_sbin_hotplug */ + envp[0] = "HOME=/"; + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + envp[2] = NULL; + + ret = call_usermodehelper(argv[0], argv, envp, 1); + if (ret < 0) + mlog_errno(ret); +} + +/* special case -1 for now + * TODO: should *really* make sure the calling func never passes -1!! */ +void ocfs2_node_map_init(struct ocfs2_node_map *map) +{ + map->num_nodes = OCFS2_NODE_MAP_MAX_NODES; + memset(map->map, 0, BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES) * + sizeof(unsigned long)); +} + +static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map, + int bit) +{ + set_bit(bit, map->map); +} + +void ocfs2_node_map_set_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit) +{ + if (bit==-1) + return; + BUG_ON(bit >= map->num_nodes); + spin_lock(&osb->node_map_lock); + __ocfs2_node_map_set_bit(map, bit); + spin_unlock(&osb->node_map_lock); +} + +static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map, + int bit) +{ + clear_bit(bit, map->map); +} + +void ocfs2_node_map_clear_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit) +{ + if (bit==-1) + return; + BUG_ON(bit >= map->num_nodes); + spin_lock(&osb->node_map_lock); + __ocfs2_node_map_clear_bit(map, bit); + spin_unlock(&osb->node_map_lock); +} + +int ocfs2_node_map_test_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit) +{ + int ret; + if (bit >= map->num_nodes) { + mlog(ML_ERROR, "bit=%d map->num_nodes=%d\n", bit, map->num_nodes); + BUG(); + } + spin_lock(&osb->node_map_lock); + ret = test_bit(bit, map->map); + spin_unlock(&osb->node_map_lock); + return ret; +} + +static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map) +{ + int bit; + bit = find_next_bit(map->map, map->num_nodes, 0); + if (bit < map->num_nodes) + return 0; + return 1; +} + +int ocfs2_node_map_is_empty(struct ocfs2_super *osb, + struct ocfs2_node_map *map) +{ + int ret; + BUG_ON(map->num_nodes == 0); + spin_lock(&osb->node_map_lock); + ret = __ocfs2_node_map_is_empty(map); + spin_unlock(&osb->node_map_lock); + return ret; +} + +static void __ocfs2_node_map_dup(struct ocfs2_node_map *target, + struct ocfs2_node_map *from) +{ + BUG_ON(from->num_nodes == 0); + ocfs2_node_map_init(target); + __ocfs2_node_map_set(target, from); +} + +/* returns 1 if bit is the only bit set in target, 0 otherwise */ +int ocfs2_node_map_is_only(struct ocfs2_super *osb, + struct ocfs2_node_map *target, + int bit) +{ + struct ocfs2_node_map temp; + int ret; + + spin_lock(&osb->node_map_lock); + __ocfs2_node_map_dup(&temp, target); + __ocfs2_node_map_clear_bit(&temp, bit); + ret = __ocfs2_node_map_is_empty(&temp); + spin_unlock(&osb->node_map_lock); + + return ret; +} + +static void __ocfs2_node_map_set(struct ocfs2_node_map *target, + struct ocfs2_node_map *from) +{ + int num_longs, i; + + BUG_ON(target->num_nodes != from->num_nodes); + BUG_ON(target->num_nodes == 0); + + num_longs = BITS_TO_LONGS(target->num_nodes); + for (i = 0; i < num_longs; i++) + target->map[i] = from->map[i]; +} + +/* Returns whether the recovery bit was actually set - it may not be + * if a node is still marked as needing recovery */ +int ocfs2_recovery_map_set(struct ocfs2_super *osb, + int num) +{ + int set = 0; + + spin_lock(&osb->node_map_lock); + + __ocfs2_node_map_clear_bit(&osb->mounted_map, num); + + if (!test_bit(num, osb->recovery_map.map)) { + __ocfs2_node_map_set_bit(&osb->recovery_map, num); + set = 1; + } + + spin_unlock(&osb->node_map_lock); + + return set; +} + +void ocfs2_recovery_map_clear(struct ocfs2_super *osb, + int num) +{ + ocfs2_node_map_clear_bit(osb, &osb->recovery_map, num); +} + +int ocfs2_node_map_iterate(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int idx) +{ + int i = idx; + + idx = O2NM_INVALID_NODE_NUM; + spin_lock(&osb->node_map_lock); + if ((i != O2NM_INVALID_NODE_NUM) && + (i >= 0) && + (i < map->num_nodes)) { + while(i < map->num_nodes) { + if (test_bit(i, map->map)) { + idx = i; + break; + } + i++; + } + } + spin_unlock(&osb->node_map_lock); + return idx; +} diff --git a/fs/ocfs2/heartbeat.h b/fs/ocfs2/heartbeat.h new file mode 100644 index 0000000..e8fb079 --- /dev/null +++ b/fs/ocfs2/heartbeat.h @@ -0,0 +1,67 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * heartbeat.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_HEARTBEAT_H +#define OCFS2_HEARTBEAT_H + +void ocfs2_init_node_maps(struct ocfs2_super *osb); + +void ocfs2_setup_hb_callbacks(struct ocfs2_super *osb); +int ocfs2_register_hb_callbacks(struct ocfs2_super *osb); +void ocfs2_clear_hb_callbacks(struct ocfs2_super *osb); +void ocfs2_stop_heartbeat(struct ocfs2_super *osb); + +/* node map functions - used to keep track of mounted and in-recovery + * nodes. */ +void ocfs2_node_map_init(struct ocfs2_node_map *map); +int ocfs2_node_map_is_empty(struct ocfs2_super *osb, + struct ocfs2_node_map *map); +void ocfs2_node_map_set_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit); +void ocfs2_node_map_clear_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit); +int ocfs2_node_map_test_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int bit); +int ocfs2_node_map_iterate(struct ocfs2_super *osb, + struct ocfs2_node_map *map, + int idx); +static inline int ocfs2_node_map_first_set_bit(struct ocfs2_super *osb, + struct ocfs2_node_map *map) +{ + return ocfs2_node_map_iterate(osb, map, 0); +} +int ocfs2_recovery_map_set(struct ocfs2_super *osb, + int num); +void ocfs2_recovery_map_clear(struct ocfs2_super *osb, + int num); +/* returns 1 if bit is the only bit set in target, 0 otherwise */ +int ocfs2_node_map_is_only(struct ocfs2_super *osb, + struct ocfs2_node_map *target, + int bit); + +#endif /* OCFS2_HEARTBEAT_H */ diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c new file mode 100644 index 0000000..a91ba4d --- /dev/null +++ b/fs/ocfs2/inode.c @@ -0,0 +1,1140 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * inode.c + * + * vfs' aops, fops, dops and iops + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/smp_lock.h> + +#include <asm/byteorder.h> + +#define MLOG_MASK_PREFIX ML_INODE +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "namei.h" +#include "suballoc.h" +#include "super.h" +#include "symlink.h" +#include "sysfile.h" +#include "uptodate.h" +#include "vote.h" + +#include "buffer_head_io.h" + +#define OCFS2_FI_FLAG_NOWAIT 0x1 +#define OCFS2_FI_FLAG_DELETE 0x2 +struct ocfs2_find_inode_args +{ + u64 fi_blkno; + unsigned long fi_ino; + unsigned int fi_flags; +}; + +static int ocfs2_read_locked_inode(struct inode *inode, + struct ocfs2_find_inode_args *args); +static int ocfs2_init_locked_inode(struct inode *inode, void *opaque); +static int ocfs2_find_actor(struct inode *inode, void *opaque); +static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh); + +struct inode *ocfs2_ilookup_for_vote(struct ocfs2_super *osb, + u64 blkno, + int delete_vote) +{ + struct ocfs2_find_inode_args args; + + /* ocfs2_ilookup_for_vote should *only* be called from the + * vote thread */ + BUG_ON(current != osb->vote_task); + + args.fi_blkno = blkno; + args.fi_flags = OCFS2_FI_FLAG_NOWAIT; + if (delete_vote) + args.fi_flags |= OCFS2_FI_FLAG_DELETE; + args.fi_ino = ino_from_blkno(osb->sb, blkno); + return ilookup5(osb->sb, args.fi_ino, ocfs2_find_actor, &args); +} + +struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno) +{ + struct inode *inode = NULL; + struct super_block *sb = osb->sb; + struct ocfs2_find_inode_args args; + + mlog_entry("(blkno = %"MLFu64")\n", blkno); + + /* Ok. By now we've either got the offsets passed to us by the + * caller, or we just pulled them off the bh. Lets do some + * sanity checks to make sure they're OK. */ + if (blkno == 0) { + inode = ERR_PTR(-EINVAL); + mlog_errno(PTR_ERR(inode)); + goto bail; + } + + args.fi_blkno = blkno; + args.fi_flags = 0; + args.fi_ino = ino_from_blkno(sb, blkno); + + inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor, + ocfs2_init_locked_inode, &args); + /* inode was *not* in the inode cache. 2.6.x requires + * us to do our own read_inode call and unlock it + * afterwards. */ + if (inode && inode->i_state & I_NEW) { + mlog(0, "Inode was not in inode cache, reading it.\n"); + ocfs2_read_locked_inode(inode, &args); + unlock_new_inode(inode); + } + if (inode == NULL) { + inode = ERR_PTR(-ENOMEM); + mlog_errno(PTR_ERR(inode)); + goto bail; + } + if (is_bad_inode(inode)) { + iput(inode); + inode = ERR_PTR(-ESTALE); + mlog_errno(PTR_ERR(inode)); + goto bail; + } + +bail: + if (!IS_ERR(inode)) { + mlog(0, "returning inode with number %"MLFu64"\n", + OCFS2_I(inode)->ip_blkno); + mlog_exit_ptr(inode); + } else + mlog_errno(PTR_ERR(inode)); + + return inode; +} + + +/* + * here's how inodes get read from disk: + * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR + * found? : return the in-memory inode + * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE + */ + +static int ocfs2_find_actor(struct inode *inode, void *opaque) +{ + struct ocfs2_find_inode_args *args = NULL; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + int ret = 0; + + mlog_entry("(0x%p, %lu, 0x%p)\n", inode, inode->i_ino, opaque); + + args = opaque; + + mlog_bug_on_msg(!inode, "No inode in find actor!\n"); + + if (oi->ip_blkno != args->fi_blkno) + goto bail; + + /* OCFS2_FI_FLAG_NOWAIT is *only* set from + * ocfs2_ilookup_for_vote which won't create an inode for one + * that isn't found. The vote thread which doesn't want to get + * an inode which is in the process of going away - otherwise + * the call to __wait_on_freeing_inode in find_inode_fast will + * cause it to deadlock on an inode which may be waiting on a + * vote (or lock release) in delete_inode */ + if ((args->fi_flags & OCFS2_FI_FLAG_NOWAIT) && + (inode->i_state & (I_FREEING|I_CLEAR))) { + /* As stated above, we're not going to return an + * inode. In the case of a delete vote, the voting + * code is going to signal the other node to go + * ahead. Mark that state here, so this freeing inode + * has the state when it gets to delete_inode. */ + if (args->fi_flags & OCFS2_FI_FLAG_DELETE) { + spin_lock(&oi->ip_lock); + ocfs2_mark_inode_remotely_deleted(inode); + spin_unlock(&oi->ip_lock); + } + goto bail; + } + + ret = 1; +bail: + mlog_exit(ret); + return ret; +} + +/* + * initialize the new inode, but don't do anything that would cause + * us to sleep. + * return 0 on success, 1 on failure + */ +static int ocfs2_init_locked_inode(struct inode *inode, void *opaque) +{ + struct ocfs2_find_inode_args *args = opaque; + + mlog_entry("inode = %p, opaque = %p\n", inode, opaque); + + inode->i_ino = args->fi_ino; + OCFS2_I(inode)->ip_blkno = args->fi_blkno; + + mlog_exit(0); + return 0; +} + +int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, + int create_ino) +{ + struct super_block *sb; + struct ocfs2_super *osb; + int status = -EINVAL; + + mlog_entry("(0x%p, size:%"MLFu64")\n", inode, fe->i_size); + + sb = inode->i_sb; + osb = OCFS2_SB(sb); + + /* this means that read_inode cannot create a superblock inode + * today. change if needed. */ + if (!OCFS2_IS_VALID_DINODE(fe) || + !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL))) { + mlog(ML_ERROR, "Invalid dinode: i_ino=%lu, i_blkno=%"MLFu64", " + "signature = %.*s, flags = 0x%x\n", + inode->i_ino, le64_to_cpu(fe->i_blkno), 7, + fe->i_signature, le32_to_cpu(fe->i_flags)); + goto bail; + } + + if (le32_to_cpu(fe->i_fs_generation) != osb->fs_generation) { + mlog(ML_ERROR, "file entry generation does not match " + "superblock! osb->fs_generation=%x, " + "fe->i_fs_generation=%x\n", + osb->fs_generation, le32_to_cpu(fe->i_fs_generation)); + goto bail; + } + + inode->i_version = 1; + inode->i_generation = le32_to_cpu(fe->i_generation); + inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev)); + inode->i_mode = le16_to_cpu(fe->i_mode); + inode->i_uid = le32_to_cpu(fe->i_uid); + inode->i_gid = le32_to_cpu(fe->i_gid); + inode->i_blksize = (u32)osb->s_clustersize; + + /* Fast symlinks will have i_size but no allocated clusters. */ + if (S_ISLNK(inode->i_mode) && !fe->i_clusters) + inode->i_blocks = 0; + else + inode->i_blocks = + ocfs2_align_bytes_to_sectors(le64_to_cpu(fe->i_size)); + inode->i_mapping->a_ops = &ocfs2_aops; + inode->i_flags |= S_NOATIME; + inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime); + inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec); + inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime); + inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec); + inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime); + inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec); + + if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno)) + mlog(ML_ERROR, + "ip_blkno %"MLFu64" != i_blkno %"MLFu64"!\n", + OCFS2_I(inode)->ip_blkno, fe->i_blkno); + + OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + OCFS2_I(inode)->ip_orphaned_slot = OCFS2_INVALID_SLOT; + + if (create_ino) + inode->i_ino = ino_from_blkno(inode->i_sb, + le64_to_cpu(fe->i_blkno)); + + mlog(0, "blkno = %"MLFu64", ino = %lu, create_ino = %s\n", + fe->i_blkno, inode->i_ino, create_ino ? "true" : "false"); + + inode->i_nlink = le16_to_cpu(fe->i_links_count); + + if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) { + OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP; + mlog(0, "local alloc inode: i_ino=%lu\n", inode->i_ino); + } else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) { + OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP; + } else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) { + mlog(0, "superblock inode: i_ino=%lu\n", inode->i_ino); + /* we can't actually hit this as read_inode can't + * handle superblocks today ;-) */ + BUG(); + } + + switch (inode->i_mode & S_IFMT) { + case S_IFREG: + inode->i_fop = &ocfs2_fops; + inode->i_op = &ocfs2_file_iops; + i_size_write(inode, le64_to_cpu(fe->i_size)); + break; + case S_IFDIR: + inode->i_op = &ocfs2_dir_iops; + inode->i_fop = &ocfs2_dops; + i_size_write(inode, le64_to_cpu(fe->i_size)); + break; + case S_IFLNK: + if (ocfs2_inode_is_fast_symlink(inode)) + inode->i_op = &ocfs2_fast_symlink_inode_operations; + else + inode->i_op = &ocfs2_symlink_inode_operations; + i_size_write(inode, le64_to_cpu(fe->i_size)); + break; + default: + inode->i_op = &ocfs2_special_file_iops; + init_special_inode(inode, inode->i_mode, + inode->i_rdev); + break; + } + + ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres, + OCFS2_LOCK_TYPE_RW, inode); + ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_meta_lockres, + OCFS2_LOCK_TYPE_META, inode); + ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_data_lockres, + OCFS2_LOCK_TYPE_DATA, inode); + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_read_locked_inode(struct inode *inode, + struct ocfs2_find_inode_args *args) +{ + struct super_block *sb; + struct ocfs2_super *osb; + struct ocfs2_dinode *fe; + struct buffer_head *bh = NULL; + int status; + int sysfile = 0; + + mlog_entry("(0x%p, 0x%p)\n", inode, args); + + status = -EINVAL; + if (inode == NULL || inode->i_sb == NULL) { + mlog(ML_ERROR, "bad inode\n"); + goto bail; + } + sb = inode->i_sb; + osb = OCFS2_SB(sb); + + if (!args) { + mlog(ML_ERROR, "bad inode args\n"); + make_bad_inode(inode); + goto bail; + } + + /* Read the FE off disk. This is safe because the kernel only + * does one read_inode2 for a new inode, and if it doesn't + * exist yet then nobody can be working on it! */ + status = ocfs2_read_block(osb, args->fi_blkno, &bh, 0, NULL); + if (status < 0) { + mlog_errno(status); + make_bad_inode(inode); + goto bail; + } + + fe = (struct ocfs2_dinode *) bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + mlog(ML_ERROR, "Invalid dinode #%"MLFu64": signature = %.*s\n", + fe->i_blkno, 7, fe->i_signature); + make_bad_inode(inode); + goto bail; + } + + if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) + sysfile = 1; + + if (S_ISCHR(le16_to_cpu(fe->i_mode)) || + S_ISBLK(le16_to_cpu(fe->i_mode))) + inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev)); + + status = -EINVAL; + if (ocfs2_populate_inode(inode, fe, 0) < 0) { + mlog(ML_ERROR, "populate inode failed! i_blkno=%"MLFu64", " + "i_ino=%lu\n", fe->i_blkno, inode->i_ino); + make_bad_inode(inode); + goto bail; + } + + BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno)); + + if (sysfile) + OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE; + + status = 0; + +bail: + if (args && bh) + brelse(bh); + + mlog_exit(status); + return status; +} + +void ocfs2_sync_blockdev(struct super_block *sb) +{ + sync_blockdev(sb->s_bdev); +} + +static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *fe_bh) +{ + int status = 0; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_truncate_context *tc = NULL; + struct ocfs2_dinode *fe; + + mlog_entry_void(); + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + /* zero allocation, zero truncate :) */ + if (!fe->i_clusters) + goto bail; + + handle = ocfs2_start_trans(osb, handle, OCFS2_INODE_UPDATE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_set_inode_size(handle, inode, fe_bh, 0ULL); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_commit_trans(handle); + handle = NULL; + + status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_commit_truncate(osb, inode, fe_bh, tc); + if (status < 0) { + mlog_errno(status); + goto bail; + } +bail: + if (handle) + ocfs2_commit_trans(handle); + + mlog_exit(status); + return status; +} + +static int ocfs2_remove_inode(struct inode *inode, + struct buffer_head *di_bh, + struct inode *orphan_dir_inode, + struct buffer_head *orphan_dir_bh) +{ + int status; + struct inode *inode_alloc_inode = NULL; + struct buffer_head *inode_alloc_bh = NULL; + struct ocfs2_journal_handle *handle; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; + + inode_alloc_inode = + ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE, + le16_to_cpu(di->i_suballoc_slot)); + if (!inode_alloc_inode) { + status = -EEXIST; + mlog_errno(status); + goto bail; + } + + down(&inode_alloc_inode->i_sem); + status = ocfs2_meta_lock(inode_alloc_inode, NULL, &inode_alloc_bh, 1); + if (status < 0) { + up(&inode_alloc_inode->i_sem); + + mlog_errno(status); + goto bail; + } + + handle = ocfs2_start_trans(osb, NULL, OCFS2_DELETE_INODE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto bail_unlock; + } + + status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode, + orphan_dir_bh); + if (status < 0) { + mlog_errno(status); + goto bail_commit; + } + + /* set the inodes dtime */ + status = ocfs2_journal_access(handle, inode, di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail_commit; + } + + di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec); + le32_and_cpu(&di->i_flags, ~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL)); + + status = ocfs2_journal_dirty(handle, di_bh); + if (status < 0) { + mlog_errno(status); + goto bail_commit; + } + + ocfs2_remove_from_cache(inode, di_bh); + + status = ocfs2_free_dinode(handle, inode_alloc_inode, + inode_alloc_bh, di); + if (status < 0) + mlog_errno(status); + +bail_commit: + ocfs2_commit_trans(handle); +bail_unlock: + ocfs2_meta_unlock(inode_alloc_inode, 1); + up(&inode_alloc_inode->i_sem); + brelse(inode_alloc_bh); +bail: + iput(inode_alloc_inode); + + return status; +} + +static int ocfs2_wipe_inode(struct inode *inode, + struct buffer_head *di_bh) +{ + int status, orphaned_slot; + struct inode *orphan_dir_inode = NULL; + struct buffer_head *orphan_dir_bh = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + /* We've already voted on this so it should be readonly - no + * spinlock needed. */ + orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot; + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + orphaned_slot); + if (!orphan_dir_inode) { + status = -EEXIST; + mlog_errno(status); + goto bail; + } + + /* Lock the orphan dir. The lock will be held for the entire + * delete_inode operation. We do this now to avoid races with + * recovery completion on other nodes. */ + down(&orphan_dir_inode->i_sem); + status = ocfs2_meta_lock(orphan_dir_inode, NULL, &orphan_dir_bh, 1); + if (status < 0) { + up(&orphan_dir_inode->i_sem); + + mlog_errno(status); + goto bail; + } + + /* we do this while holding the orphan dir lock because we + * don't want recovery being run from another node to vote for + * an inode delete on us -- this will result in two nodes + * truncating the same file! */ + status = ocfs2_truncate_for_delete(osb, inode, di_bh); + if (status < 0) { + mlog_errno(status); + goto bail_unlock_dir; + } + + status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode, + orphan_dir_bh); + if (status < 0) + mlog_errno(status); + +bail_unlock_dir: + ocfs2_meta_unlock(orphan_dir_inode, 1); + up(&orphan_dir_inode->i_sem); + brelse(orphan_dir_bh); +bail: + iput(orphan_dir_inode); + + return status; +} + +/* There is a series of simple checks that should be done before a + * vote is even considered. Encapsulate those in this function. */ +static int ocfs2_inode_is_valid_to_delete(struct inode *inode) +{ + int ret = 0; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + /* We shouldn't be getting here for the root directory + * inode.. */ + if (inode == osb->root_inode) { + mlog(ML_ERROR, "Skipping delete of root inode.\n"); + goto bail; + } + + /* If we're coming from process_vote we can't go into our own + * voting [hello, deadlock city!], so unforuntately we just + * have to skip deleting this guy. That's OK though because + * the node who's doing the actual deleting should handle it + * anyway. */ + if (current == osb->vote_task) { + mlog(0, "Skipping delete of %lu because we're currently " + "in process_vote\n", inode->i_ino); + goto bail; + } + + spin_lock(&oi->ip_lock); + /* OCFS2 *never* deletes system files. This should technically + * never get here as system file inodes should always have a + * positive link count. */ + if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) { + mlog(ML_ERROR, "Skipping delete of system file %"MLFu64".\n", + oi->ip_blkno); + goto bail_unlock; + } + + /* If we have voted "yes" on the wipe of this inode for + * another node, it will be marked here so we can safely skip + * it. Recovery will cleanup any inodes we might inadvertantly + * skip here. */ + if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE) { + mlog(0, "Skipping delete of %lu because another node " + "has done this for us.\n", inode->i_ino); + goto bail_unlock; + } + + ret = 1; +bail_unlock: + spin_unlock(&oi->ip_lock); +bail: + return ret; +} + +/* Query the cluster to determine whether we should wipe an inode from + * disk or not. + * + * Requires the inode to have the cluster lock. */ +static int ocfs2_query_inode_wipe(struct inode *inode, + struct buffer_head *di_bh, + int *wipe) +{ + int status = 0; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_dinode *di; + + *wipe = 0; + + /* While we were waiting for the cluster lock in + * ocfs2_delete_inode, another node might have asked to delete + * the inode. Recheck our flags to catch this. */ + if (!ocfs2_inode_is_valid_to_delete(inode)) { + mlog(0, "Skipping delete of %"MLFu64" because flags changed\n", + oi->ip_blkno); + goto bail; + } + + /* Now that we have an up to date inode, we can double check + * the link count. */ + if (inode->i_nlink) { + mlog(0, "Skipping delete of %"MLFu64" because nlink = %u\n", + oi->ip_blkno, inode->i_nlink); + goto bail; + } + + /* Do some basic inode verification... */ + di = (struct ocfs2_dinode *) di_bh->b_data; + if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL))) { + /* for lack of a better error? */ + status = -EEXIST; + mlog(ML_ERROR, + "Inode %"MLFu64" (on-disk %"MLFu64") not orphaned! " + "Disk flags 0x%x, inode flags 0x%x\n", + oi->ip_blkno, di->i_blkno, di->i_flags, oi->ip_flags); + goto bail; + } + + /* has someone already deleted us?! baaad... */ + if (di->i_dtime) { + status = -EEXIST; + mlog_errno(status); + goto bail; + } + + status = ocfs2_request_delete_vote(inode); + /* -EBUSY means that other nodes are still using the + * inode. We're done here though, so avoid doing anything on + * disk and let them worry about deleting it. */ + if (status == -EBUSY) { + status = 0; + mlog(0, "Skipping delete of %"MLFu64" because it is in use on" + "other nodes\n", oi->ip_blkno); + goto bail; + } + if (status < 0) { + mlog_errno(status); + goto bail; + } + + spin_lock(&oi->ip_lock); + if (oi->ip_orphaned_slot == OCFS2_INVALID_SLOT) { + /* Nobody knew which slot this inode was orphaned + * into. This may happen during node death and + * recovery knows how to clean it up so we can safely + * ignore this inode for now on. */ + mlog(0, "Nobody knew where inode %"MLFu64" was orphaned!\n", + oi->ip_blkno); + } else { + *wipe = 1; + + mlog(0, "Inode %"MLFu64" is ok to wipe from orphan dir %d\n", + oi->ip_blkno, oi->ip_orphaned_slot); + } + spin_unlock(&oi->ip_lock); + +bail: + return status; +} + +/* Support function for ocfs2_delete_inode. Will help us keep the + * inode data in a consistent state for clear_inode. Always truncates + * pages, optionally sync's them first. */ +static void ocfs2_cleanup_delete_inode(struct inode *inode, + int sync_data) +{ + mlog(0, "Cleanup inode %"MLFu64", sync = %d\n", + OCFS2_I(inode)->ip_blkno, sync_data); + if (sync_data) + write_inode_now(inode, 1); + truncate_inode_pages(&inode->i_data, 0); +} + +void ocfs2_delete_inode(struct inode *inode) +{ + int wipe, status; + sigset_t blocked, oldset; + struct buffer_head *di_bh = NULL; + + mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino); + + if (is_bad_inode(inode)) { + mlog(0, "Skipping delete of bad inode\n"); + goto bail; + } + + if (!ocfs2_inode_is_valid_to_delete(inode)) { + /* It's probably not necessary to truncate_inode_pages + * here but we do it for safety anyway (it will most + * likely be a no-op anyway) */ + ocfs2_cleanup_delete_inode(inode, 0); + goto bail; + } + + /* We want to block signals in delete_inode as the lock and + * messaging paths may return us -ERESTARTSYS. Which would + * cause us to exit early, resulting in inodes being orphaned + * forever. */ + sigfillset(&blocked); + status = sigprocmask(SIG_BLOCK, &blocked, &oldset); + if (status < 0) { + mlog_errno(status); + ocfs2_cleanup_delete_inode(inode, 1); + goto bail; + } + + /* Lock down the inode. This gives us an up to date view of + * it's metadata (for verification), and allows us to + * serialize delete_inode votes. + * + * Even though we might be doing a truncate, we don't take the + * allocation lock here as it won't be needed - nobody will + * have the file open. + */ + status = ocfs2_meta_lock(inode, NULL, &di_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + ocfs2_cleanup_delete_inode(inode, 0); + goto bail_unblock; + } + + /* Query the cluster. This will be the final decision made + * before we go ahead and wipe the inode. */ + status = ocfs2_query_inode_wipe(inode, di_bh, &wipe); + if (!wipe || status < 0) { + /* Error and inode busy vote both mean we won't be + * removing the inode, so they take almost the same + * path. */ + if (status < 0) + mlog_errno(status); + + /* Someone in the cluster has voted to not wipe this + * inode, or it was never completely orphaned. Write + * out the pages and exit now. */ + ocfs2_cleanup_delete_inode(inode, 1); + goto bail_unlock_inode; + } + + ocfs2_cleanup_delete_inode(inode, 0); + + status = ocfs2_wipe_inode(inode, di_bh); + if (status < 0) { + mlog_errno(status); + goto bail_unlock_inode; + } + + /* Mark the inode as successfully deleted. This is important + * for ocfs2_clear_inode as it will check this flag and skip + * any checkpointing work */ + OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED; + +bail_unlock_inode: + ocfs2_meta_unlock(inode, 1); + brelse(di_bh); +bail_unblock: + status = sigprocmask(SIG_SETMASK, &oldset, NULL); + if (status < 0) + mlog_errno(status); +bail: + clear_inode(inode); + mlog_exit_void(); +} + +void ocfs2_clear_inode(struct inode *inode) +{ + int status; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + mlog_entry_void(); + + if (!inode) + goto bail; + + mlog(0, "Clearing inode: %"MLFu64", nlink = %u\n", + OCFS2_I(inode)->ip_blkno, inode->i_nlink); + + mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL, + "Inode=%lu\n", inode->i_ino); + + /* Do these before all the other work so that we don't bounce + * the vote thread while waiting to destroy the locks. */ + ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres); + ocfs2_mark_lockres_freeing(&oi->ip_meta_lockres); + ocfs2_mark_lockres_freeing(&oi->ip_data_lockres); + + /* We very well may get a clear_inode before all an inodes + * metadata has hit disk. Of course, we can't drop any cluster + * locks until the journal has finished with it. The only + * exception here are successfully wiped inodes - their + * metadata can now be considered to be part of the system + * inodes from which it came. */ + if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED)) + ocfs2_checkpoint_inode(inode); + + mlog_bug_on_msg(!list_empty(&oi->ip_io_markers), + "Clear inode of %"MLFu64", inode has io markers\n", + oi->ip_blkno); + + ocfs2_extent_map_drop(inode, 0); + ocfs2_extent_map_init(inode); + + status = ocfs2_drop_inode_locks(inode); + if (status < 0) + mlog_errno(status); + + ocfs2_lock_res_free(&oi->ip_rw_lockres); + ocfs2_lock_res_free(&oi->ip_meta_lockres); + ocfs2_lock_res_free(&oi->ip_data_lockres); + + ocfs2_metadata_cache_purge(inode); + + mlog_bug_on_msg(oi->ip_metadata_cache.ci_num_cached, + "Clear inode of %"MLFu64", inode has %u cache items\n", + oi->ip_blkno, oi->ip_metadata_cache.ci_num_cached); + + mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE), + "Clear inode of %"MLFu64", inode has a bad flag\n", + oi->ip_blkno); + + mlog_bug_on_msg(spin_is_locked(&oi->ip_lock), + "Clear inode of %"MLFu64", inode is locked\n", + oi->ip_blkno); + + mlog_bug_on_msg(down_trylock(&oi->ip_io_sem), + "Clear inode of %"MLFu64", io_sem is locked\n", + oi->ip_blkno); + up(&oi->ip_io_sem); + + /* + * down_trylock() returns 0, down_write_trylock() returns 1 + * kernel 1, world 0 + */ + mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem), + "Clear inode of %"MLFu64", alloc_sem is locked\n", + oi->ip_blkno); + up_write(&oi->ip_alloc_sem); + + mlog_bug_on_msg(oi->ip_open_count, + "Clear inode of %"MLFu64" has open count %d\n", + oi->ip_blkno, oi->ip_open_count); + mlog_bug_on_msg(!list_empty(&oi->ip_handle_list), + "Clear inode of %"MLFu64" has non empty handle list\n", + oi->ip_blkno); + mlog_bug_on_msg(oi->ip_handle, + "Clear inode of %"MLFu64" has non empty handle pointer\n", + oi->ip_blkno); + + /* Clear all other flags. */ + oi->ip_flags = OCFS2_INODE_CACHE_INLINE; + oi->ip_created_trans = 0; + oi->ip_last_trans = 0; + oi->ip_dir_start_lookup = 0; + oi->ip_blkno = 0ULL; + +bail: + mlog_exit_void(); +} + +/* Called under inode_lock, with no more references on the + * struct inode, so it's safe here to check the flags field + * and to manipulate i_nlink without any other locks. */ +void ocfs2_drop_inode(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + mlog_entry_void(); + + mlog(0, "Drop inode %"MLFu64", nlink = %u, ip_flags = 0x%x\n", + oi->ip_blkno, inode->i_nlink, oi->ip_flags); + + /* Testing ip_orphaned_slot here wouldn't work because we may + * not have gotten a delete_inode vote from any other nodes + * yet. */ + if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED) { + mlog(0, "Inode was orphaned on another node, clearing nlink.\n"); + inode->i_nlink = 0; + } + + generic_drop_inode(inode); + + mlog_exit_void(); +} + +/* + * TODO: this should probably be merged into ocfs2_get_block + * + * However, you now need to pay attention to the cont_prepare_write() + * stuff in ocfs2_get_block (that is, ocfs2_get_block pretty much + * expects never to extend). + */ +struct buffer_head *ocfs2_bread(struct inode *inode, + int block, int *err, int reada) +{ + struct buffer_head *bh = NULL; + int tmperr; + u64 p_blkno; + int readflags = OCFS2_BH_CACHED; + +#if 0 + /* only turn this on if we know we can deal with read_block + * returning nothing */ + if (reada) + readflags |= OCFS2_BH_READAHEAD; +#endif + + if (((u64)block << inode->i_sb->s_blocksize_bits) >= + i_size_read(inode)) { + BUG_ON(!reada); + return NULL; + } + + tmperr = ocfs2_extent_map_get_blocks(inode, block, 1, + &p_blkno, NULL); + if (tmperr < 0) { + mlog_errno(tmperr); + goto fail; + } + + tmperr = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, &bh, + readflags, inode); + if (tmperr < 0) + goto fail; + + tmperr = 0; + + *err = 0; + return bh; + +fail: + if (bh) { + brelse(bh); + bh = NULL; + } + *err = -EIO; + return NULL; +} + +/* + * This is called from our getattr. + */ +int ocfs2_inode_revalidate(struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + int status = 0; + + mlog_entry("(inode = 0x%p, ino = %"MLFu64")\n", inode, + inode ? OCFS2_I(inode)->ip_blkno : 0ULL); + + if (!inode) { + mlog(0, "eep, no inode!\n"); + status = -ENOENT; + goto bail; + } + + spin_lock(&OCFS2_I(inode)->ip_lock); + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { + spin_unlock(&OCFS2_I(inode)->ip_lock); + mlog(0, "inode deleted!\n"); + status = -ENOENT; + goto bail; + } + spin_unlock(&OCFS2_I(inode)->ip_lock); + + /* Let ocfs2_meta_lock do the work of updating our struct + * inode for us. */ + status = ocfs2_meta_lock(inode, NULL, NULL, 0); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + ocfs2_meta_unlock(inode, 0); +bail: + mlog_exit(status); + + return status; +} + +/* + * Updates a disk inode from a + * struct inode. + * Only takes ip_lock. + */ +int ocfs2_mark_inode_dirty(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *bh) +{ + int status; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data; + + mlog_entry("(inode %"MLFu64")\n", OCFS2_I(inode)->ip_blkno); + + status = ocfs2_journal_access(handle, inode, bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + spin_lock(&OCFS2_I(inode)->ip_lock); + fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters); + spin_unlock(&OCFS2_I(inode)->ip_lock); + + fe->i_size = cpu_to_le64(i_size_read(inode)); + fe->i_links_count = cpu_to_le16(inode->i_nlink); + fe->i_uid = cpu_to_le32(inode->i_uid); + fe->i_gid = cpu_to_le32(inode->i_gid); + fe->i_mode = cpu_to_le16(inode->i_mode); + fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec); + fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec); + fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); + fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); + fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); + fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); + + status = ocfs2_journal_dirty(handle, bh); + if (status < 0) + mlog_errno(status); + + status = 0; +leave: + + mlog_exit(status); + return status; +} + +/* + * + * Updates a struct inode from a disk inode. + * does no i/o, only takes ip_lock. + */ +void ocfs2_refresh_inode(struct inode *inode, + struct ocfs2_dinode *fe) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + spin_lock(&OCFS2_I(inode)->ip_lock); + + OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + i_size_write(inode, le64_to_cpu(fe->i_size)); + inode->i_nlink = le16_to_cpu(fe->i_links_count); + inode->i_uid = le32_to_cpu(fe->i_uid); + inode->i_gid = le32_to_cpu(fe->i_gid); + inode->i_mode = le16_to_cpu(fe->i_mode); + inode->i_blksize = (u32) osb->s_clustersize; + if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0) + inode->i_blocks = 0; + else + inode->i_blocks = ocfs2_align_bytes_to_sectors(i_size_read(inode)); + inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime); + inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec); + inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime); + inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec); + inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime); + inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec); + + spin_unlock(&OCFS2_I(inode)->ip_lock); +} diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h new file mode 100644 index 0000000..9b01774 --- /dev/null +++ b/fs/ocfs2/inode.h @@ -0,0 +1,145 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * inode.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_INODE_H +#define OCFS2_INODE_H + +/* OCFS2 Inode Private Data */ +struct ocfs2_inode_info +{ + u64 ip_blkno; + + struct ocfs2_lock_res ip_rw_lockres; + struct ocfs2_lock_res ip_meta_lockres; + struct ocfs2_lock_res ip_data_lockres; + + /* protects allocation changes on this inode. */ + struct rw_semaphore ip_alloc_sem; + + /* These fields are protected by ip_lock */ + spinlock_t ip_lock; + u32 ip_open_count; + u32 ip_clusters; + struct ocfs2_extent_map ip_map; + struct list_head ip_io_markers; + int ip_orphaned_slot; + + struct semaphore ip_io_sem; + + /* Used by the journalling code to attach an inode to a + * handle. These are protected by ip_io_sem in order to lock + * out other I/O to the inode until we either commit or + * abort. */ + struct list_head ip_handle_list; + struct ocfs2_journal_handle *ip_handle; + + u32 ip_flags; /* see below */ + + /* protected by recovery_lock. */ + struct inode *ip_next_orphan; + + u32 ip_dir_start_lookup; + + /* next two are protected by trans_inc_lock */ + /* which transaction were we created on? Zero if none. */ + unsigned long ip_created_trans; + /* last transaction we were a part of. */ + unsigned long ip_last_trans; + + struct ocfs2_caching_info ip_metadata_cache; + + struct inode vfs_inode; +}; + +/* + * Flags for the ip_flags field + */ +/* System file inodes */ +#define OCFS2_INODE_SYSTEM_FILE 0x00000001 +#define OCFS2_INODE_JOURNAL 0x00000002 +#define OCFS2_INODE_BITMAP 0x00000004 +/* This inode has been wiped from disk */ +#define OCFS2_INODE_DELETED 0x00000008 +/* Another node is deleting, so our delete is a nop */ +#define OCFS2_INODE_SKIP_DELETE 0x00000010 +/* Has the inode been orphaned on another node? + * + * This hints to ocfs2_drop_inode that it should clear i_nlink before + * continuing. + * + * We *only* set this on unlink vote from another node. If the inode + * was locally orphaned, then we're sure of the state and don't need + * to twiddle i_nlink later - it's either zero or not depending on + * whether our unlink succeeded. Otherwise we got this from a node + * whose intention was to orphan the inode, however he may have + * crashed, failed etc, so we let ocfs2_drop_inode zero the value and + * rely on ocfs2_delete_inode to sort things out under the proper + * cluster locks. + */ +#define OCFS2_INODE_MAYBE_ORPHANED 0x00000020 +/* Does someone have the file open O_DIRECT */ +#define OCFS2_INODE_OPEN_DIRECT 0x00000040 +/* Indicates that the metadata cache should be used as an array. */ +#define OCFS2_INODE_CACHE_INLINE 0x00000080 + +static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode) +{ + return container_of(inode, struct ocfs2_inode_info, vfs_inode); +} + +#define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL) +#define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL) + +extern kmem_cache_t *ocfs2_inode_cache; + +extern struct address_space_operations ocfs2_aops; + +struct buffer_head *ocfs2_bread(struct inode *inode, int block, + int *err, int reada); +void ocfs2_clear_inode(struct inode *inode); +void ocfs2_delete_inode(struct inode *inode); +void ocfs2_drop_inode(struct inode *inode); +struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff); +struct inode *ocfs2_ilookup_for_vote(struct ocfs2_super *osb, + u64 blkno, + int delete_vote); +int ocfs2_inode_init_private(struct inode *inode); +int ocfs2_inode_revalidate(struct dentry *dentry); +int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, + int create_ino); +void ocfs2_read_inode(struct inode *inode); +void ocfs2_read_inode2(struct inode *inode, void *opaque); +ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf, + size_t size, loff_t *offp); +void ocfs2_sync_blockdev(struct super_block *sb); +void ocfs2_refresh_inode(struct inode *inode, + struct ocfs2_dinode *fe); +int ocfs2_mark_inode_dirty(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *bh); +int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb); +int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb); + +#endif /* OCFS2_INODE_H */ diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c new file mode 100644 index 0000000..0442804 --- /dev/null +++ b/fs/ocfs2/journal.c @@ -0,0 +1,1652 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * journal.c + * + * Defines functions of journalling api + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/kthread.h> + +#define MLOG_MASK_PREFIX ML_JOURNAL +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "heartbeat.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "namei.h" +#include "slot_map.h" +#include "super.h" +#include "vote.h" +#include "sysfile.h" + +#include "buffer_head_io.h" + +spinlock_t trans_inc_lock = SPIN_LOCK_UNLOCKED; + +static int ocfs2_force_read_journal(struct inode *inode); +static int ocfs2_recover_node(struct ocfs2_super *osb, + int node_num); +static int __ocfs2_recovery_thread(void *arg); +static int ocfs2_commit_cache(struct ocfs2_super *osb); +static int ocfs2_wait_on_mount(struct ocfs2_super *osb); +static void ocfs2_handle_cleanup_locks(struct ocfs2_journal *journal, + struct ocfs2_journal_handle *handle); +static void ocfs2_commit_unstarted_handle(struct ocfs2_journal_handle *handle); +static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb, + int dirty); +static int ocfs2_trylock_journal(struct ocfs2_super *osb, + int slot_num); +static int ocfs2_recover_orphans(struct ocfs2_super *osb, + int slot); +static int ocfs2_commit_thread(void *arg); + +static int ocfs2_commit_cache(struct ocfs2_super *osb) +{ + int status = 0; + unsigned int flushed; + unsigned long old_id; + struct ocfs2_journal *journal = NULL; + + mlog_entry_void(); + + journal = osb->journal; + + /* Flush all pending commits and checkpoint the journal. */ + down_write(&journal->j_trans_barrier); + + if (atomic_read(&journal->j_num_trans) == 0) { + up_write(&journal->j_trans_barrier); + mlog(0, "No transactions for me to flush!\n"); + goto finally; + } + + journal_lock_updates(journal->j_journal); + status = journal_flush(journal->j_journal); + journal_unlock_updates(journal->j_journal); + if (status < 0) { + up_write(&journal->j_trans_barrier); + mlog_errno(status); + goto finally; + } + + old_id = ocfs2_inc_trans_id(journal); + + flushed = atomic_read(&journal->j_num_trans); + atomic_set(&journal->j_num_trans, 0); + up_write(&journal->j_trans_barrier); + + mlog(0, "commit_thread: flushed transaction %lu (%u handles)\n", + journal->j_trans_id, flushed); + + ocfs2_kick_vote_thread(osb); + wake_up(&journal->j_checkpointed); +finally: + mlog_exit(status); + return status; +} + +struct ocfs2_journal_handle *ocfs2_alloc_handle(struct ocfs2_super *osb) +{ + struct ocfs2_journal_handle *retval = NULL; + + retval = kcalloc(1, sizeof(*retval), GFP_KERNEL); + if (!retval) { + mlog(ML_ERROR, "Failed to allocate memory for journal " + "handle!\n"); + return NULL; + } + + retval->max_buffs = 0; + retval->num_locks = 0; + retval->k_handle = NULL; + + INIT_LIST_HEAD(&retval->locks); + INIT_LIST_HEAD(&retval->inode_list); + retval->journal = osb->journal; + + return retval; +} + +/* pass it NULL and it will allocate a new handle object for you. If + * you pass it a handle however, it may still return error, in which + * case it has free'd the passed handle for you. */ +struct ocfs2_journal_handle *ocfs2_start_trans(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + int max_buffs) +{ + int ret; + journal_t *journal = osb->journal->j_journal; + + mlog_entry("(max_buffs = %d)\n", max_buffs); + + if (!osb || !osb->journal->j_journal) + BUG(); + + if (ocfs2_is_hard_readonly(osb)) { + ret = -EROFS; + goto done_free; + } + + BUG_ON(osb->journal->j_state == OCFS2_JOURNAL_FREE); + BUG_ON(max_buffs <= 0); + + /* JBD might support this, but our journalling code doesn't yet. */ + if (journal_current_handle()) { + mlog(ML_ERROR, "Recursive transaction attempted!\n"); + BUG(); + } + + if (!handle) + handle = ocfs2_alloc_handle(osb); + if (!handle) { + ret = -ENOMEM; + mlog(ML_ERROR, "Failed to allocate memory for journal " + "handle!\n"); + goto done_free; + } + + handle->max_buffs = max_buffs; + + down_read(&osb->journal->j_trans_barrier); + + /* actually start the transaction now */ + handle->k_handle = journal_start(journal, max_buffs); + if (IS_ERR(handle->k_handle)) { + up_read(&osb->journal->j_trans_barrier); + + ret = PTR_ERR(handle->k_handle); + handle->k_handle = NULL; + mlog_errno(ret); + + if (is_journal_aborted(journal)) { + ocfs2_abort(osb->sb, "Detected aborted journal"); + ret = -EROFS; + } + goto done_free; + } + + atomic_inc(&(osb->journal->j_num_trans)); + handle->flags |= OCFS2_HANDLE_STARTED; + + mlog_exit_ptr(handle); + return handle; + +done_free: + if (handle) + ocfs2_commit_unstarted_handle(handle); /* will kfree handle */ + + mlog_exit(ret); + return ERR_PTR(ret); +} + +void ocfs2_handle_add_inode(struct ocfs2_journal_handle *handle, + struct inode *inode) +{ + BUG_ON(!handle); + BUG_ON(!inode); + + atomic_inc(&inode->i_count); + + /* we're obviously changing it... */ + down(&inode->i_sem); + + /* sanity check */ + BUG_ON(OCFS2_I(inode)->ip_handle); + BUG_ON(!list_empty(&OCFS2_I(inode)->ip_handle_list)); + + OCFS2_I(inode)->ip_handle = handle; + list_del(&(OCFS2_I(inode)->ip_handle_list)); + list_add_tail(&(OCFS2_I(inode)->ip_handle_list), &(handle->inode_list)); +} + +static void ocfs2_handle_unlock_inodes(struct ocfs2_journal_handle *handle) +{ + struct list_head *p, *n; + struct inode *inode; + struct ocfs2_inode_info *oi; + + list_for_each_safe(p, n, &handle->inode_list) { + oi = list_entry(p, struct ocfs2_inode_info, + ip_handle_list); + inode = &oi->vfs_inode; + + OCFS2_I(inode)->ip_handle = NULL; + list_del_init(&OCFS2_I(inode)->ip_handle_list); + + up(&inode->i_sem); + iput(inode); + } +} + +/* This is trivial so we do it out of the main commit + * paths. Beware, it can be called from start_trans too! */ +static void ocfs2_commit_unstarted_handle(struct ocfs2_journal_handle *handle) +{ + mlog_entry_void(); + + BUG_ON(handle->flags & OCFS2_HANDLE_STARTED); + + ocfs2_handle_unlock_inodes(handle); + /* You are allowed to add journal locks before the transaction + * has started. */ + ocfs2_handle_cleanup_locks(handle->journal, handle); + + kfree(handle); + + mlog_exit_void(); +} + +void ocfs2_commit_trans(struct ocfs2_journal_handle *handle) +{ + handle_t *jbd_handle; + int retval; + struct ocfs2_journal *journal = handle->journal; + + mlog_entry_void(); + + BUG_ON(!handle); + + if (!(handle->flags & OCFS2_HANDLE_STARTED)) { + ocfs2_commit_unstarted_handle(handle); + mlog_exit_void(); + return; + } + + /* release inode semaphores we took during this transaction */ + ocfs2_handle_unlock_inodes(handle); + + /* ocfs2_extend_trans may have had to call journal_restart + * which will always commit the transaction, but may return + * error for any number of reasons. If this is the case, we + * clear k_handle as it's not valid any more. */ + if (handle->k_handle) { + jbd_handle = handle->k_handle; + + if (handle->flags & OCFS2_HANDLE_SYNC) + jbd_handle->h_sync = 1; + else + jbd_handle->h_sync = 0; + + /* actually stop the transaction. if we've set h_sync, + * it'll have been committed when we return */ + retval = journal_stop(jbd_handle); + if (retval < 0) { + mlog_errno(retval); + mlog(ML_ERROR, "Could not commit transaction\n"); + BUG(); + } + + handle->k_handle = NULL; /* it's been free'd in journal_stop */ + } + + ocfs2_handle_cleanup_locks(journal, handle); + + up_read(&journal->j_trans_barrier); + + kfree(handle); + mlog_exit_void(); +} + +/* + * 'nblocks' is what you want to add to the current + * transaction. extend_trans will either extend the current handle by + * nblocks, or commit it and start a new one with nblocks credits. + * + * WARNING: This will not release any semaphores or disk locks taken + * during the transaction, so make sure they were taken *before* + * start_trans or we'll have ordering deadlocks. + * + * WARNING2: Note that we do *not* drop j_trans_barrier here. This is + * good because transaction ids haven't yet been recorded on the + * cluster locks associated with this handle. + */ +int ocfs2_extend_trans(struct ocfs2_journal_handle *handle, + int nblocks) +{ + int status; + + BUG_ON(!handle); + BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED)); + BUG_ON(!nblocks); + + mlog_entry_void(); + + mlog(0, "Trying to extend transaction by %d blocks\n", nblocks); + + status = journal_extend(handle->k_handle, nblocks); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (status > 0) { + mlog(0, "journal_extend failed, trying journal_restart\n"); + status = journal_restart(handle->k_handle, nblocks); + if (status < 0) { + handle->k_handle = NULL; + mlog_errno(status); + goto bail; + } + handle->max_buffs = nblocks; + } else + handle->max_buffs += nblocks; + + status = 0; +bail: + + mlog_exit(status); + return status; +} + +int ocfs2_journal_access(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *bh, + int type) +{ + int status; + + BUG_ON(!inode); + BUG_ON(!handle); + BUG_ON(!bh); + BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED)); + + mlog_entry("bh->b_blocknr=%llu, type=%d (\"%s\"), bh->b_size = %hu\n", + (unsigned long long)bh->b_blocknr, type, + (type == OCFS2_JOURNAL_ACCESS_CREATE) ? + "OCFS2_JOURNAL_ACCESS_CREATE" : + "OCFS2_JOURNAL_ACCESS_WRITE", + bh->b_size); + + /* we can safely remove this assertion after testing. */ + if (!buffer_uptodate(bh)) { + mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n"); + mlog(ML_ERROR, "b_blocknr=%llu\n", + (unsigned long long)bh->b_blocknr); + BUG(); + } + + /* Set the current transaction information on the inode so + * that the locking code knows whether it can drop it's locks + * on this inode or not. We're protected from the commit + * thread updating the current transaction id until + * ocfs2_commit_trans() because ocfs2_start_trans() took + * j_trans_barrier for us. */ + ocfs2_set_inode_lock_trans(OCFS2_SB(inode->i_sb)->journal, inode); + + down(&OCFS2_I(inode)->ip_io_sem); + switch (type) { + case OCFS2_JOURNAL_ACCESS_CREATE: + case OCFS2_JOURNAL_ACCESS_WRITE: + status = journal_get_write_access(handle->k_handle, bh); + break; + + case OCFS2_JOURNAL_ACCESS_UNDO: + status = journal_get_undo_access(handle->k_handle, bh); + break; + + default: + status = -EINVAL; + mlog(ML_ERROR, "Uknown access type!\n"); + } + up(&OCFS2_I(inode)->ip_io_sem); + + if (status < 0) + mlog(ML_ERROR, "Error %d getting %d access to buffer!\n", + status, type); + + mlog_exit(status); + return status; +} + +int ocfs2_journal_dirty(struct ocfs2_journal_handle *handle, + struct buffer_head *bh) +{ + int status; + + BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED)); + + mlog_entry("(bh->b_blocknr=%llu)\n", + (unsigned long long)bh->b_blocknr); + + status = journal_dirty_metadata(handle->k_handle, bh); + if (status < 0) + mlog(ML_ERROR, "Could not dirty metadata buffer. " + "(bh->b_blocknr=%llu)\n", + (unsigned long long)bh->b_blocknr); + + mlog_exit(status); + return status; +} + +int ocfs2_journal_dirty_data(handle_t *handle, + struct buffer_head *bh) +{ + int err = journal_dirty_data(handle, bh); + if (err) + mlog_errno(err); + /* TODO: When we can handle it, abort the handle and go RO on + * error here. */ + + return err; +} + +/* We always assume you're adding a metadata lock at level 'ex' */ +int ocfs2_handle_add_lock(struct ocfs2_journal_handle *handle, + struct inode *inode) +{ + int status; + struct ocfs2_journal_lock *lock; + + BUG_ON(!inode); + + lock = kmem_cache_alloc(ocfs2_lock_cache, GFP_NOFS); + if (!lock) { + status = -ENOMEM; + mlog_errno(-ENOMEM); + goto bail; + } + + if (!igrab(inode)) + BUG(); + lock->jl_inode = inode; + + list_add_tail(&(lock->jl_lock_list), &(handle->locks)); + handle->num_locks++; + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static void ocfs2_handle_cleanup_locks(struct ocfs2_journal *journal, + struct ocfs2_journal_handle *handle) +{ + struct list_head *p, *n; + struct ocfs2_journal_lock *lock; + struct inode *inode; + + list_for_each_safe(p, n, &(handle->locks)) { + lock = list_entry(p, struct ocfs2_journal_lock, + jl_lock_list); + list_del(&lock->jl_lock_list); + handle->num_locks--; + + inode = lock->jl_inode; + ocfs2_meta_unlock(inode, 1); + if (atomic_read(&inode->i_count) == 1) + mlog(ML_ERROR, + "Inode %"MLFu64", I'm doing a last iput for!", + OCFS2_I(inode)->ip_blkno); + iput(inode); + kmem_cache_free(ocfs2_lock_cache, lock); + } +} + +#define OCFS2_DEFAULT_COMMIT_INTERVAL (HZ * 5) + +void ocfs2_set_journal_params(struct ocfs2_super *osb) +{ + journal_t *journal = osb->journal->j_journal; + + spin_lock(&journal->j_state_lock); + journal->j_commit_interval = OCFS2_DEFAULT_COMMIT_INTERVAL; + if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER) + journal->j_flags |= JFS_BARRIER; + else + journal->j_flags &= ~JFS_BARRIER; + spin_unlock(&journal->j_state_lock); +} + +int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty) +{ + int status = -1; + struct inode *inode = NULL; /* the journal inode */ + journal_t *j_journal = NULL; + struct ocfs2_dinode *di = NULL; + struct buffer_head *bh = NULL; + struct ocfs2_super *osb; + int meta_lock = 0; + + mlog_entry_void(); + + BUG_ON(!journal); + + osb = journal->j_osb; + + /* already have the inode for our journal */ + inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE, + osb->slot_num); + if (inode == NULL) { + status = -EACCES; + mlog_errno(status); + goto done; + } + if (is_bad_inode(inode)) { + mlog(ML_ERROR, "access error (bad inode)\n"); + iput(inode); + inode = NULL; + status = -EACCES; + goto done; + } + + SET_INODE_JOURNAL(inode); + OCFS2_I(inode)->ip_open_count++; + + status = ocfs2_meta_lock(inode, NULL, &bh, 1); + if (status < 0) { + if (status != -ERESTARTSYS) + mlog(ML_ERROR, "Could not get lock on journal!\n"); + goto done; + } + + meta_lock = 1; + di = (struct ocfs2_dinode *)bh->b_data; + + if (inode->i_size < OCFS2_MIN_JOURNAL_SIZE) { + mlog(ML_ERROR, "Journal file size (%lld) is too small!\n", + inode->i_size); + status = -EINVAL; + goto done; + } + + mlog(0, "inode->i_size = %lld\n", inode->i_size); + mlog(0, "inode->i_blocks = %lu\n", inode->i_blocks); + mlog(0, "inode->ip_clusters = %u\n", OCFS2_I(inode)->ip_clusters); + + /* call the kernels journal init function now */ + j_journal = journal_init_inode(inode); + if (j_journal == NULL) { + mlog(ML_ERROR, "Linux journal layer error\n"); + status = -EINVAL; + goto done; + } + + mlog(0, "Returned from journal_init_inode\n"); + mlog(0, "j_journal->j_maxlen = %u\n", j_journal->j_maxlen); + + *dirty = (le32_to_cpu(di->id1.journal1.ij_flags) & + OCFS2_JOURNAL_DIRTY_FL); + + journal->j_journal = j_journal; + journal->j_inode = inode; + journal->j_bh = bh; + + ocfs2_set_journal_params(osb); + + journal->j_state = OCFS2_JOURNAL_LOADED; + + status = 0; +done: + if (status < 0) { + if (meta_lock) + ocfs2_meta_unlock(inode, 1); + if (bh != NULL) + brelse(bh); + if (inode) { + OCFS2_I(inode)->ip_open_count--; + iput(inode); + } + } + + mlog_exit(status); + return status; +} + +static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb, + int dirty) +{ + int status; + unsigned int flags; + struct ocfs2_journal *journal = osb->journal; + struct buffer_head *bh = journal->j_bh; + struct ocfs2_dinode *fe; + + mlog_entry_void(); + + fe = (struct ocfs2_dinode *)bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + /* This is called from startup/shutdown which will + * handle the errors in a specific manner, so no need + * to call ocfs2_error() here. */ + mlog(ML_ERROR, "Journal dinode %"MLFu64" has invalid " + "signature: %.*s", fe->i_blkno, 7, fe->i_signature); + status = -EIO; + goto out; + } + + flags = le32_to_cpu(fe->id1.journal1.ij_flags); + if (dirty) + flags |= OCFS2_JOURNAL_DIRTY_FL; + else + flags &= ~OCFS2_JOURNAL_DIRTY_FL; + fe->id1.journal1.ij_flags = cpu_to_le32(flags); + + status = ocfs2_write_block(osb, bh, journal->j_inode); + if (status < 0) + mlog_errno(status); + +out: + mlog_exit(status); + return status; +} + +/* + * If the journal has been kmalloc'd it needs to be freed after this + * call. + */ +void ocfs2_journal_shutdown(struct ocfs2_super *osb) +{ + struct ocfs2_journal *journal = NULL; + int status = 0; + struct inode *inode = NULL; + int num_running_trans = 0; + + mlog_entry_void(); + + if (!osb) + BUG(); + + journal = osb->journal; + if (!journal) + goto done; + + inode = journal->j_inode; + + if (journal->j_state != OCFS2_JOURNAL_LOADED) + goto done; + + /* need to inc inode use count as journal_destroy will iput. */ + if (!igrab(inode)) + BUG(); + + num_running_trans = atomic_read(&(osb->journal->j_num_trans)); + if (num_running_trans > 0) + mlog(0, "Shutting down journal: must wait on %d " + "running transactions!\n", + num_running_trans); + + /* Do a commit_cache here. It will flush our journal, *and* + * release any locks that are still held. + * set the SHUTDOWN flag and release the trans lock. + * the commit thread will take the trans lock for us below. */ + journal->j_state = OCFS2_JOURNAL_IN_SHUTDOWN; + + /* The OCFS2_JOURNAL_IN_SHUTDOWN will signal to commit_cache to not + * drop the trans_lock (which we want to hold until we + * completely destroy the journal. */ + if (osb->commit_task) { + /* Wait for the commit thread */ + mlog(0, "Waiting for ocfs2commit to exit....\n"); + kthread_stop(osb->commit_task); + osb->commit_task = NULL; + } + + BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0); + + status = ocfs2_journal_toggle_dirty(osb, 0); + if (status < 0) + mlog_errno(status); + + /* Shutdown the kernel journal system */ + journal_destroy(journal->j_journal); + + OCFS2_I(inode)->ip_open_count--; + + /* unlock our journal */ + ocfs2_meta_unlock(inode, 1); + + brelse(journal->j_bh); + journal->j_bh = NULL; + + journal->j_state = OCFS2_JOURNAL_FREE; + +// up_write(&journal->j_trans_barrier); +done: + if (inode) + iput(inode); + mlog_exit_void(); +} + +static void ocfs2_clear_journal_error(struct super_block *sb, + journal_t *journal, + int slot) +{ + int olderr; + + olderr = journal_errno(journal); + if (olderr) { + mlog(ML_ERROR, "File system error %d recorded in " + "journal %u.\n", olderr, slot); + mlog(ML_ERROR, "File system on device %s needs checking.\n", + sb->s_id); + + journal_ack_err(journal); + journal_clear_err(journal); + } +} + +int ocfs2_journal_load(struct ocfs2_journal *journal) +{ + int status = 0; + struct ocfs2_super *osb; + + mlog_entry_void(); + + if (!journal) + BUG(); + + osb = journal->j_osb; + + status = journal_load(journal->j_journal); + if (status < 0) { + mlog(ML_ERROR, "Failed to load journal!\n"); + goto done; + } + + ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); + + status = ocfs2_journal_toggle_dirty(osb, 1); + if (status < 0) { + mlog_errno(status); + goto done; + } + + /* Launch the commit thread */ + osb->commit_task = kthread_run(ocfs2_commit_thread, osb, "ocfs2cmt-%d", + osb->osb_id); + if (IS_ERR(osb->commit_task)) { + status = PTR_ERR(osb->commit_task); + osb->commit_task = NULL; + mlog(ML_ERROR, "unable to launch ocfs2commit thread, error=%d", + status); + goto done; + } + +done: + mlog_exit(status); + return status; +} + + +/* 'full' flag tells us whether we clear out all blocks or if we just + * mark the journal clean */ +int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full) +{ + int status; + + mlog_entry_void(); + + if (!journal) + BUG(); + + status = journal_wipe(journal->j_journal, full); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_journal_toggle_dirty(journal->j_osb, 0); + if (status < 0) + mlog_errno(status); + +bail: + mlog_exit(status); + return status; +} + +/* + * JBD Might read a cached version of another nodes journal file. We + * don't want this as this file changes often and we get no + * notification on those changes. The only way to be sure that we've + * got the most up to date version of those blocks then is to force + * read them off disk. Just searching through the buffer cache won't + * work as there may be pages backing this file which are still marked + * up to date. We know things can't change on this file underneath us + * as we have the lock by now :) + */ +static int ocfs2_force_read_journal(struct inode *inode) +{ + int status = 0; + int i, p_blocks; + u64 v_blkno, p_blkno; +#define CONCURRENT_JOURNAL_FILL 32 + struct buffer_head *bhs[CONCURRENT_JOURNAL_FILL]; + + mlog_entry_void(); + + BUG_ON(inode->i_blocks != + ocfs2_align_bytes_to_sectors(i_size_read(inode))); + + memset(bhs, 0, sizeof(struct buffer_head *) * CONCURRENT_JOURNAL_FILL); + + mlog(0, "Force reading %lu blocks\n", + (inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9))); + + v_blkno = 0; + while (v_blkno < + (inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9))) { + + status = ocfs2_extent_map_get_blocks(inode, v_blkno, + 1, &p_blkno, + &p_blocks); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (p_blocks > CONCURRENT_JOURNAL_FILL) + p_blocks = CONCURRENT_JOURNAL_FILL; + + status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), + p_blkno, p_blocks, bhs, 0, + inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + for(i = 0; i < p_blocks; i++) { + brelse(bhs[i]); + bhs[i] = NULL; + } + + v_blkno += p_blocks; + } + +bail: + for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++) + if (bhs[i]) + brelse(bhs[i]); + mlog_exit(status); + return status; +} + +struct ocfs2_la_recovery_item { + struct list_head lri_list; + int lri_slot; + struct ocfs2_dinode *lri_la_dinode; + struct ocfs2_dinode *lri_tl_dinode; +}; + +/* Does the second half of the recovery process. By this point, the + * node is marked clean and can actually be considered recovered, + * hence it's no longer in the recovery map, but there's still some + * cleanup we can do which shouldn't happen within the recovery thread + * as locking in that context becomes very difficult if we are to take + * recovering nodes into account. + * + * NOTE: This function can and will sleep on recovery of other nodes + * during cluster locking, just like any other ocfs2 process. + */ +void ocfs2_complete_recovery(void *data) +{ + int ret; + struct ocfs2_super *osb = data; + struct ocfs2_journal *journal = osb->journal; + struct ocfs2_dinode *la_dinode, *tl_dinode; + struct ocfs2_la_recovery_item *item; + struct list_head *p, *n; + LIST_HEAD(tmp_la_list); + + mlog_entry_void(); + + mlog(0, "completing recovery from keventd\n"); + + spin_lock(&journal->j_lock); + list_splice_init(&journal->j_la_cleanups, &tmp_la_list); + spin_unlock(&journal->j_lock); + + list_for_each_safe(p, n, &tmp_la_list) { + item = list_entry(p, struct ocfs2_la_recovery_item, lri_list); + list_del_init(&item->lri_list); + + mlog(0, "Complete recovery for slot %d\n", item->lri_slot); + + la_dinode = item->lri_la_dinode; + if (la_dinode) { + mlog(0, "Clean up local alloc %"MLFu64"\n", + la_dinode->i_blkno); + + ret = ocfs2_complete_local_alloc_recovery(osb, + la_dinode); + if (ret < 0) + mlog_errno(ret); + + kfree(la_dinode); + } + + tl_dinode = item->lri_tl_dinode; + if (tl_dinode) { + mlog(0, "Clean up truncate log %"MLFu64"\n", + tl_dinode->i_blkno); + + ret = ocfs2_complete_truncate_log_recovery(osb, + tl_dinode); + if (ret < 0) + mlog_errno(ret); + + kfree(tl_dinode); + } + + ret = ocfs2_recover_orphans(osb, item->lri_slot); + if (ret < 0) + mlog_errno(ret); + + kfree(item); + } + + mlog(0, "Recovery completion\n"); + mlog_exit_void(); +} + +/* NOTE: This function always eats your references to la_dinode and + * tl_dinode, either manually on error, or by passing them to + * ocfs2_complete_recovery */ +static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal, + int slot_num, + struct ocfs2_dinode *la_dinode, + struct ocfs2_dinode *tl_dinode) +{ + struct ocfs2_la_recovery_item *item; + + item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_KERNEL); + if (!item) { + /* Though we wish to avoid it, we are in fact safe in + * skipping local alloc cleanup as fsck.ocfs2 is more + * than capable of reclaiming unused space. */ + if (la_dinode) + kfree(la_dinode); + + if (tl_dinode) + kfree(tl_dinode); + + mlog_errno(-ENOMEM); + return; + } + + INIT_LIST_HEAD(&item->lri_list); + item->lri_la_dinode = la_dinode; + item->lri_slot = slot_num; + item->lri_tl_dinode = tl_dinode; + + spin_lock(&journal->j_lock); + list_add_tail(&item->lri_list, &journal->j_la_cleanups); + queue_work(ocfs2_wq, &journal->j_recovery_work); + spin_unlock(&journal->j_lock); +} + +/* Called by the mount code to queue recovery the last part of + * recovery for it's own slot. */ +void ocfs2_complete_mount_recovery(struct ocfs2_super *osb) +{ + struct ocfs2_journal *journal = osb->journal; + + if (osb->dirty) { + /* No need to queue up our truncate_log as regular + * cleanup will catch that. */ + ocfs2_queue_recovery_completion(journal, + osb->slot_num, + osb->local_alloc_copy, + NULL); + ocfs2_schedule_truncate_log_flush(osb, 0); + + osb->local_alloc_copy = NULL; + osb->dirty = 0; + } +} + +static int __ocfs2_recovery_thread(void *arg) +{ + int status, node_num; + struct ocfs2_super *osb = arg; + + mlog_entry_void(); + + status = ocfs2_wait_on_mount(osb); + if (status < 0) { + goto bail; + } + +restart: + status = ocfs2_super_lock(osb, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + while(!ocfs2_node_map_is_empty(osb, &osb->recovery_map)) { + node_num = ocfs2_node_map_first_set_bit(osb, + &osb->recovery_map); + if (node_num == O2NM_INVALID_NODE_NUM) { + mlog(0, "Out of nodes to recover.\n"); + break; + } + + status = ocfs2_recover_node(osb, node_num); + if (status < 0) { + mlog(ML_ERROR, + "Error %d recovering node %d on device (%u,%u)!\n", + status, node_num, + MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev)); + mlog(ML_ERROR, "Volume requires unmount.\n"); + continue; + } + + ocfs2_recovery_map_clear(osb, node_num); + } + ocfs2_super_unlock(osb, 1); + + /* We always run recovery on our own orphan dir - the dead + * node(s) may have voted "no" on an inode delete earlier. A + * revote is therefore required. */ + ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL, + NULL); + +bail: + down(&osb->recovery_lock); + if (!status && + !ocfs2_node_map_is_empty(osb, &osb->recovery_map)) { + up(&osb->recovery_lock); + goto restart; + } + + osb->recovery_thread_task = NULL; + mb(); /* sync with ocfs2_recovery_thread_running */ + wake_up(&osb->recovery_event); + + up(&osb->recovery_lock); + + mlog_exit(status); + /* no one is callint kthread_stop() for us so the kthread() api + * requires that we call do_exit(). And it isn't exported, but + * complete_and_exit() seems to be a minimal wrapper around it. */ + complete_and_exit(NULL, status); + return status; +} + +void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num) +{ + mlog_entry("(node_num=%d, osb->node_num = %d)\n", + node_num, osb->node_num); + + down(&osb->recovery_lock); + if (osb->disable_recovery) + goto out; + + /* People waiting on recovery will wait on + * the recovery map to empty. */ + if (!ocfs2_recovery_map_set(osb, node_num)) + mlog(0, "node %d already be in recovery.\n", node_num); + + mlog(0, "starting recovery thread...\n"); + + if (osb->recovery_thread_task) + goto out; + + osb->recovery_thread_task = kthread_run(__ocfs2_recovery_thread, osb, + "ocfs2rec-%d", osb->osb_id); + if (IS_ERR(osb->recovery_thread_task)) { + mlog_errno((int)PTR_ERR(osb->recovery_thread_task)); + osb->recovery_thread_task = NULL; + } + +out: + up(&osb->recovery_lock); + wake_up(&osb->recovery_event); + + mlog_exit_void(); +} + +/* Does the actual journal replay and marks the journal inode as + * clean. Will only replay if the journal inode is marked dirty. */ +static int ocfs2_replay_journal(struct ocfs2_super *osb, + int node_num, + int slot_num) +{ + int status; + int got_lock = 0; + unsigned int flags; + struct inode *inode = NULL; + struct ocfs2_dinode *fe; + journal_t *journal = NULL; + struct buffer_head *bh = NULL; + + inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE, + slot_num); + if (inode == NULL) { + status = -EACCES; + mlog_errno(status); + goto done; + } + if (is_bad_inode(inode)) { + status = -EACCES; + iput(inode); + inode = NULL; + mlog_errno(status); + goto done; + } + SET_INODE_JOURNAL(inode); + + status = ocfs2_meta_lock_full(inode, NULL, &bh, 1, + OCFS2_META_LOCK_RECOVERY); + if (status < 0) { + mlog(0, "status returned from ocfs2_meta_lock=%d\n", status); + if (status != -ERESTARTSYS) + mlog(ML_ERROR, "Could not lock journal!\n"); + goto done; + } + got_lock = 1; + + fe = (struct ocfs2_dinode *) bh->b_data; + + flags = le32_to_cpu(fe->id1.journal1.ij_flags); + + if (!(flags & OCFS2_JOURNAL_DIRTY_FL)) { + mlog(0, "No recovery required for node %d\n", node_num); + goto done; + } + + mlog(ML_NOTICE, "Recovering node %d from slot %d on device (%u,%u)\n", + node_num, slot_num, + MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev)); + + OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + + status = ocfs2_force_read_journal(inode); + if (status < 0) { + mlog_errno(status); + goto done; + } + + mlog(0, "calling journal_init_inode\n"); + journal = journal_init_inode(inode); + if (journal == NULL) { + mlog(ML_ERROR, "Linux journal layer error\n"); + status = -EIO; + goto done; + } + + status = journal_load(journal); + if (status < 0) { + mlog_errno(status); + if (!igrab(inode)) + BUG(); + journal_destroy(journal); + goto done; + } + + ocfs2_clear_journal_error(osb->sb, journal, slot_num); + + /* wipe the journal */ + mlog(0, "flushing the journal.\n"); + journal_lock_updates(journal); + status = journal_flush(journal); + journal_unlock_updates(journal); + if (status < 0) + mlog_errno(status); + + /* This will mark the node clean */ + flags = le32_to_cpu(fe->id1.journal1.ij_flags); + flags &= ~OCFS2_JOURNAL_DIRTY_FL; + fe->id1.journal1.ij_flags = cpu_to_le32(flags); + + status = ocfs2_write_block(osb, bh, inode); + if (status < 0) + mlog_errno(status); + + if (!igrab(inode)) + BUG(); + + journal_destroy(journal); + +done: + /* drop the lock on this nodes journal */ + if (got_lock) + ocfs2_meta_unlock(inode, 1); + + if (inode) + iput(inode); + + if (bh) + brelse(bh); + + mlog_exit(status); + return status; +} + +/* + * Do the most important parts of node recovery: + * - Replay it's journal + * - Stamp a clean local allocator file + * - Stamp a clean truncate log + * - Mark the node clean + * + * If this function completes without error, a node in OCFS2 can be + * said to have been safely recovered. As a result, failure during the + * second part of a nodes recovery process (local alloc recovery) is + * far less concerning. + */ +static int ocfs2_recover_node(struct ocfs2_super *osb, + int node_num) +{ + int status = 0; + int slot_num; + struct ocfs2_slot_info *si = osb->slot_info; + struct ocfs2_dinode *la_copy = NULL; + struct ocfs2_dinode *tl_copy = NULL; + + mlog_entry("(node_num=%d, osb->node_num = %d)\n", + node_num, osb->node_num); + + mlog(0, "checking node %d\n", node_num); + + /* Should not ever be called to recover ourselves -- in that + * case we should've called ocfs2_journal_load instead. */ + if (osb->node_num == node_num) + BUG(); + + slot_num = ocfs2_node_num_to_slot(si, node_num); + if (slot_num == OCFS2_INVALID_SLOT) { + status = 0; + mlog(0, "no slot for this node, so no recovery required.\n"); + goto done; + } + + mlog(0, "node %d was using slot %d\n", node_num, slot_num); + + status = ocfs2_replay_journal(osb, node_num, slot_num); + if (status < 0) { + mlog_errno(status); + goto done; + } + + /* Stamp a clean local alloc file AFTER recovering the journal... */ + status = ocfs2_begin_local_alloc_recovery(osb, slot_num, &la_copy); + if (status < 0) { + mlog_errno(status); + goto done; + } + + /* An error from begin_truncate_log_recovery is not + * serious enough to warrant halting the rest of + * recovery. */ + status = ocfs2_begin_truncate_log_recovery(osb, slot_num, &tl_copy); + if (status < 0) + mlog_errno(status); + + /* Likewise, this would be a strange but ultimately not so + * harmful place to get an error... */ + ocfs2_clear_slot(si, slot_num); + status = ocfs2_update_disk_slots(osb, si); + if (status < 0) + mlog_errno(status); + + /* This will kfree the memory pointed to by la_copy and tl_copy */ + ocfs2_queue_recovery_completion(osb->journal, slot_num, la_copy, + tl_copy); + + status = 0; +done: + + mlog_exit(status); + return status; +} + +/* Test node liveness by trylocking his journal. If we get the lock, + * we drop it here. Return 0 if we got the lock, -EAGAIN if node is + * still alive (we couldn't get the lock) and < 0 on error. */ +static int ocfs2_trylock_journal(struct ocfs2_super *osb, + int slot_num) +{ + int status, flags; + struct inode *inode = NULL; + + inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE, + slot_num); + if (inode == NULL) { + mlog(ML_ERROR, "access error\n"); + status = -EACCES; + goto bail; + } + if (is_bad_inode(inode)) { + mlog(ML_ERROR, "access error (bad inode)\n"); + iput(inode); + inode = NULL; + status = -EACCES; + goto bail; + } + SET_INODE_JOURNAL(inode); + + flags = OCFS2_META_LOCK_RECOVERY | OCFS2_META_LOCK_NOQUEUE; + status = ocfs2_meta_lock_full(inode, NULL, NULL, 1, flags); + if (status < 0) { + if (status != -EAGAIN) + mlog_errno(status); + goto bail; + } + + ocfs2_meta_unlock(inode, 1); +bail: + if (inode) + iput(inode); + + return status; +} + +/* Call this underneath ocfs2_super_lock. It also assumes that the + * slot info struct has been updated from disk. */ +int ocfs2_mark_dead_nodes(struct ocfs2_super *osb) +{ + int status, i, node_num; + struct ocfs2_slot_info *si = osb->slot_info; + + /* This is called with the super block cluster lock, so we + * know that the slot map can't change underneath us. */ + + spin_lock(&si->si_lock); + for(i = 0; i < si->si_num_slots; i++) { + if (i == osb->slot_num) + continue; + if (ocfs2_is_empty_slot(si, i)) + continue; + + node_num = si->si_global_node_nums[i]; + if (ocfs2_node_map_test_bit(osb, &osb->recovery_map, node_num)) + continue; + spin_unlock(&si->si_lock); + + /* Ok, we have a slot occupied by another node which + * is not in the recovery map. We trylock his journal + * file here to test if he's alive. */ + status = ocfs2_trylock_journal(osb, i); + if (!status) { + /* Since we're called from mount, we know that + * the recovery thread can't race us on + * setting / checking the recovery bits. */ + ocfs2_recovery_thread(osb, node_num); + } else if ((status < 0) && (status != -EAGAIN)) { + mlog_errno(status); + goto bail; + } + + spin_lock(&si->si_lock); + } + spin_unlock(&si->si_lock); + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_recover_orphans(struct ocfs2_super *osb, + int slot) +{ + int status = 0; + int have_disk_lock = 0; + struct inode *inode = NULL; + struct inode *iter; + struct inode *orphan_dir_inode = NULL; + unsigned long offset, blk, local; + struct buffer_head *bh = NULL; + struct ocfs2_dir_entry *de; + struct super_block *sb = osb->sb; + struct ocfs2_inode_info *oi; + + mlog(0, "Recover inodes from orphan dir in slot %d\n", slot); + + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + slot); + if (!orphan_dir_inode) { + status = -ENOENT; + mlog_errno(status); + goto out; + } + + down(&orphan_dir_inode->i_sem); + status = ocfs2_meta_lock(orphan_dir_inode, NULL, NULL, 0); + if (status < 0) { + up(&orphan_dir_inode->i_sem); + mlog_errno(status); + goto out; + } + have_disk_lock = 1; + + offset = 0; + iter = NULL; + while(offset < i_size_read(orphan_dir_inode)) { + blk = offset >> sb->s_blocksize_bits; + + bh = ocfs2_bread(orphan_dir_inode, blk, &status, 0); + if (!bh) + status = -EINVAL; + if (status < 0) { + up(&orphan_dir_inode->i_sem); + if (bh) + brelse(bh); + mlog_errno(status); + goto out; + } + + local = 0; + while(offset < i_size_read(orphan_dir_inode) + && local < sb->s_blocksize) { + de = (struct ocfs2_dir_entry *) (bh->b_data + local); + + if (!ocfs2_check_dir_entry(orphan_dir_inode, + de, bh, local)) { + up(&orphan_dir_inode->i_sem); + status = -EINVAL; + mlog_errno(status); + brelse(bh); + goto out; + } + + local += le16_to_cpu(de->rec_len); + offset += le16_to_cpu(de->rec_len); + + /* I guess we silently fail on no inode? */ + if (!le64_to_cpu(de->inode)) + continue; + if (de->file_type > OCFS2_FT_MAX) { + mlog(ML_ERROR, + "block %llu contains invalid de: " + "inode = %"MLFu64", rec_len = %u, " + "name_len = %u, file_type = %u, " + "name='%.*s'\n", + (unsigned long long)bh->b_blocknr, + le64_to_cpu(de->inode), + le16_to_cpu(de->rec_len), + de->name_len, + de->file_type, + de->name_len, + de->name); + continue; + } + if (de->name_len == 1 && !strncmp(".", de->name, 1)) + continue; + if (de->name_len == 2 && !strncmp("..", de->name, 2)) + continue; + + iter = ocfs2_iget(osb, le64_to_cpu(de->inode)); + if (IS_ERR(iter)) + continue; + + mlog(0, "queue orphan %"MLFu64"\n", + OCFS2_I(iter)->ip_blkno); + OCFS2_I(iter)->ip_next_orphan = inode; + inode = iter; + } + brelse(bh); + } + up(&orphan_dir_inode->i_sem); + + ocfs2_meta_unlock(orphan_dir_inode, 0); + have_disk_lock = 0; + + iput(orphan_dir_inode); + orphan_dir_inode = NULL; + + while (inode) { + oi = OCFS2_I(inode); + mlog(0, "iput orphan %"MLFu64"\n", oi->ip_blkno); + + iter = oi->ip_next_orphan; + + spin_lock(&oi->ip_lock); + /* Delete voting may have set these on the assumption + * that the other node would wipe them successfully. + * If they are still in the node's orphan dir, we need + * to reset that state. */ + oi->ip_flags &= ~(OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE); + + /* Set the proper information to get us going into + * ocfs2_delete_inode. */ + oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; + oi->ip_orphaned_slot = slot; + spin_unlock(&oi->ip_lock); + + iput(inode); + + inode = iter; + } + +out: + if (have_disk_lock) + ocfs2_meta_unlock(orphan_dir_inode, 0); + + if (orphan_dir_inode) + iput(orphan_dir_inode); + + return status; +} + +static int ocfs2_wait_on_mount(struct ocfs2_super *osb) +{ + /* This check is good because ocfs2 will wait on our recovery + * thread before changing it to something other than MOUNTED + * or DISABLED. */ + wait_event(osb->osb_mount_event, + atomic_read(&osb->vol_state) == VOLUME_MOUNTED || + atomic_read(&osb->vol_state) == VOLUME_DISABLED); + + /* If there's an error on mount, then we may never get to the + * MOUNTED flag, but this is set right before + * dismount_volume() so we can trust it. */ + if (atomic_read(&osb->vol_state) == VOLUME_DISABLED) { + mlog(0, "mount error, exiting!\n"); + return -EBUSY; + } + + return 0; +} + +static int ocfs2_commit_thread(void *arg) +{ + int status; + struct ocfs2_super *osb = arg; + struct ocfs2_journal *journal = osb->journal; + + /* we can trust j_num_trans here because _should_stop() is only set in + * shutdown and nobody other than ourselves should be able to start + * transactions. committing on shutdown might take a few iterations + * as final transactions put deleted inodes on the list */ + while (!(kthread_should_stop() && + atomic_read(&journal->j_num_trans) == 0)) { + + wait_event_interruptible_timeout(osb->checkpoint_event, + atomic_read(&journal->j_num_trans) + || kthread_should_stop(), + OCFS2_CHECKPOINT_INTERVAL); + + status = ocfs2_commit_cache(osb); + if (status < 0) + mlog_errno(status); + + if (kthread_should_stop() && atomic_read(&journal->j_num_trans)){ + mlog(ML_KTHREAD, + "commit_thread: %u transactions pending on " + "shutdown\n", + atomic_read(&journal->j_num_trans)); + } + } + + return 0; +} + +/* Look for a dirty journal without taking any cluster locks. Used for + * hard readonly access to determine whether the file system journals + * require recovery. */ +int ocfs2_check_journals_nolocks(struct ocfs2_super *osb) +{ + int ret = 0; + unsigned int slot; + struct buffer_head *di_bh; + struct ocfs2_dinode *di; + struct inode *journal = NULL; + + for(slot = 0; slot < osb->max_slots; slot++) { + journal = ocfs2_get_system_file_inode(osb, + JOURNAL_SYSTEM_INODE, + slot); + if (!journal || is_bad_inode(journal)) { + ret = -EACCES; + mlog_errno(ret); + goto out; + } + + di_bh = NULL; + ret = ocfs2_read_block(osb, OCFS2_I(journal)->ip_blkno, &di_bh, + 0, journal); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + di = (struct ocfs2_dinode *) di_bh->b_data; + + if (le32_to_cpu(di->id1.journal1.ij_flags) & + OCFS2_JOURNAL_DIRTY_FL) + ret = -EROFS; + + brelse(di_bh); + if (ret) + break; + } + +out: + if (journal) + iput(journal); + + return ret; +} diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h new file mode 100644 index 0000000..7d0a816 --- /dev/null +++ b/fs/ocfs2/journal.h @@ -0,0 +1,457 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * journal.h + * + * Defines journalling api and structures. + * + * Copyright (C) 2003, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_JOURNAL_H +#define OCFS2_JOURNAL_H + +#include <linux/fs.h> +#include <linux/jbd.h> + +#define OCFS2_CHECKPOINT_INTERVAL (8 * HZ) + +enum ocfs2_journal_state { + OCFS2_JOURNAL_FREE = 0, + OCFS2_JOURNAL_LOADED, + OCFS2_JOURNAL_IN_SHUTDOWN, +}; + +struct ocfs2_super; +struct ocfs2_dinode; +struct ocfs2_journal_handle; + +struct ocfs2_journal { + enum ocfs2_journal_state j_state; /* Journals current state */ + + journal_t *j_journal; /* The kernels journal type */ + struct inode *j_inode; /* Kernel inode pointing to + * this journal */ + struct ocfs2_super *j_osb; /* pointer to the super + * block for the node + * we're currently + * running on -- not + * necessarily the super + * block from the node + * which we usually run + * from (recovery, + * etc) */ + struct buffer_head *j_bh; /* Journal disk inode block */ + atomic_t j_num_trans; /* Number of transactions + * currently in the system. */ + unsigned long j_trans_id; + struct rw_semaphore j_trans_barrier; + wait_queue_head_t j_checkpointed; + + spinlock_t j_lock; + struct list_head j_la_cleanups; + struct work_struct j_recovery_work; +}; + +extern spinlock_t trans_inc_lock; + +/* wrap j_trans_id so we never have it equal to zero. */ +static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j) +{ + unsigned long old_id; + spin_lock(&trans_inc_lock); + old_id = j->j_trans_id++; + if (unlikely(!j->j_trans_id)) + j->j_trans_id = 1; + spin_unlock(&trans_inc_lock); + return old_id; +} + +static inline void ocfs2_set_inode_lock_trans(struct ocfs2_journal *journal, + struct inode *inode) +{ + spin_lock(&trans_inc_lock); + OCFS2_I(inode)->ip_last_trans = journal->j_trans_id; + spin_unlock(&trans_inc_lock); +} + +/* Used to figure out whether it's safe to drop a metadata lock on an + * inode. Returns true if all the inodes changes have been + * checkpointed to disk. You should be holding the spinlock on the + * metadata lock while calling this to be sure that nobody can take + * the lock and put it on another transaction. */ +static inline int ocfs2_inode_fully_checkpointed(struct inode *inode) +{ + int ret; + struct ocfs2_journal *journal = OCFS2_SB(inode->i_sb)->journal; + + spin_lock(&trans_inc_lock); + ret = time_after(journal->j_trans_id, OCFS2_I(inode)->ip_last_trans); + spin_unlock(&trans_inc_lock); + return ret; +} + +/* convenience function to check if an inode is still new (has never + * hit disk) Will do you a favor and set created_trans = 0 when you've + * been checkpointed. returns '1' if the inode is still new. */ +static inline int ocfs2_inode_is_new(struct inode *inode) +{ + int ret; + + /* System files are never "new" as they're written out by + * mkfs. This helps us early during mount, before we have the + * journal open and j_trans_id could be junk. */ + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) + return 0; + spin_lock(&trans_inc_lock); + ret = !(time_after(OCFS2_SB(inode->i_sb)->journal->j_trans_id, + OCFS2_I(inode)->ip_created_trans)); + if (!ret) + OCFS2_I(inode)->ip_created_trans = 0; + spin_unlock(&trans_inc_lock); + return ret; +} + +static inline void ocfs2_inode_set_new(struct ocfs2_super *osb, + struct inode *inode) +{ + spin_lock(&trans_inc_lock); + OCFS2_I(inode)->ip_created_trans = osb->journal->j_trans_id; + spin_unlock(&trans_inc_lock); +} + +extern kmem_cache_t *ocfs2_lock_cache; + +struct ocfs2_journal_lock { + struct inode *jl_inode; + struct list_head jl_lock_list; +}; + +struct ocfs2_journal_handle { + handle_t *k_handle; /* kernel handle. */ + struct ocfs2_journal *journal; + u32 flags; /* see flags below. */ + int max_buffs; /* Buffs reserved by this handle */ + + /* The following two fields are for ocfs2_handle_add_lock */ + int num_locks; + struct list_head locks; /* A bunch of locks to + * release on commit. This + * should be a list_head */ + + struct list_head inode_list; +}; + +#define OCFS2_HANDLE_STARTED 1 +/* should we sync-commit this handle? */ +#define OCFS2_HANDLE_SYNC 2 +static inline int ocfs2_handle_started(struct ocfs2_journal_handle *handle) +{ + return handle->flags & OCFS2_HANDLE_STARTED; +} + +static inline void ocfs2_handle_set_sync(struct ocfs2_journal_handle *handle, int sync) +{ + if (sync) + handle->flags |= OCFS2_HANDLE_SYNC; + else + handle->flags &= ~OCFS2_HANDLE_SYNC; +} + +/* Exported only for the journal struct init code in super.c. Do not call. */ +void ocfs2_complete_recovery(void *data); + +/* + * Journal Control: + * Initialize, Load, Shutdown, Wipe a journal. + * + * ocfs2_journal_init - Initialize journal structures in the OSB. + * ocfs2_journal_load - Load the given journal off disk. Replay it if + * there's transactions still in there. + * ocfs2_journal_shutdown - Shutdown a journal, this will flush all + * uncommitted, uncheckpointed transactions. + * ocfs2_journal_wipe - Wipe transactions from a journal. Optionally + * zero out each block. + * ocfs2_recovery_thread - Perform recovery on a node. osb is our own osb. + * ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat + * event on. + * ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint. + */ +void ocfs2_set_journal_params(struct ocfs2_super *osb); +int ocfs2_journal_init(struct ocfs2_journal *journal, + int *dirty); +void ocfs2_journal_shutdown(struct ocfs2_super *osb); +int ocfs2_journal_wipe(struct ocfs2_journal *journal, + int full); +int ocfs2_journal_load(struct ocfs2_journal *journal); +int ocfs2_check_journals_nolocks(struct ocfs2_super *osb); +void ocfs2_recovery_thread(struct ocfs2_super *osb, + int node_num); +int ocfs2_mark_dead_nodes(struct ocfs2_super *osb); +void ocfs2_complete_mount_recovery(struct ocfs2_super *osb); + +static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb) +{ + atomic_set(&osb->needs_checkpoint, 1); + wake_up(&osb->checkpoint_event); +} + +static inline void ocfs2_checkpoint_inode(struct inode *inode) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + if (!ocfs2_inode_fully_checkpointed(inode)) { + /* WARNING: This only kicks off a single + * checkpoint. If someone races you and adds more + * metadata to the journal, you won't know, and will + * wind up waiting *alot* longer than necessary. Right + * now we only use this in clear_inode so that's + * OK. */ + ocfs2_start_checkpoint(osb); + + wait_event(osb->journal->j_checkpointed, + ocfs2_inode_fully_checkpointed(inode)); + } +} + +/* + * Transaction Handling: + * Manage the lifetime of a transaction handle. + * + * ocfs2_alloc_handle - Only allocate a handle so we can start putting + * cluster locks on it. To actually change blocks, + * call ocfs2_start_trans with the handle returned + * from this function. You may call ocfs2_commit_trans + * at any time in the lifetime of a handle. + * ocfs2_start_trans - Begin a transaction. Give it an upper estimate of + * the number of blocks that will be changed during + * this handle. + * ocfs2_commit_trans - Complete a handle. + * ocfs2_extend_trans - Extend a handle by nblocks credits. This may + * commit the handle to disk in the process, but will + * not release any locks taken during the transaction. + * ocfs2_journal_access - Notify the handle that we want to journal this + * buffer. Will have to call ocfs2_journal_dirty once + * we've actually dirtied it. Type is one of . or . + * ocfs2_journal_dirty - Mark a journalled buffer as having dirty data. + * ocfs2_journal_dirty_data - Indicate that a data buffer should go out before + * the current handle commits. + * ocfs2_handle_add_lock - Sometimes we need to delay lock release + * until after a transaction has been completed. Use + * ocfs2_handle_add_lock to indicate that a lock needs + * to be released at the end of that handle. Locks + * will be released in the order that they are added. + * ocfs2_handle_add_inode - Add a locked inode to a transaction. + */ + +/* You must always start_trans with a number of buffs > 0, but it's + * perfectly legal to go through an entire transaction without having + * dirtied any buffers. */ +struct ocfs2_journal_handle *ocfs2_alloc_handle(struct ocfs2_super *osb); +struct ocfs2_journal_handle *ocfs2_start_trans(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + int max_buffs); +void ocfs2_commit_trans(struct ocfs2_journal_handle *handle); +int ocfs2_extend_trans(struct ocfs2_journal_handle *handle, + int nblocks); + +/* + * Create access is for when we get a newly created buffer and we're + * not gonna read it off disk, but rather fill it ourselves. Right + * now, we don't do anything special with this (it turns into a write + * request), but this is a good placeholder in case we do... + * + * Write access is for when we read a block off disk and are going to + * modify it. This way the journalling layer knows it may need to make + * a copy of that block (if it's part of another, uncommitted + * transaction) before we do so. + */ +#define OCFS2_JOURNAL_ACCESS_CREATE 0 +#define OCFS2_JOURNAL_ACCESS_WRITE 1 +#define OCFS2_JOURNAL_ACCESS_UNDO 2 + +int ocfs2_journal_access(struct ocfs2_journal_handle *handle, + struct inode *inode, + struct buffer_head *bh, + int type); +/* + * A word about the journal_access/journal_dirty "dance". It is + * entirely legal to journal_access a buffer more than once (as long + * as the access type is the same -- I'm not sure what will happen if + * access type is different but this should never happen anyway) It is + * also legal to journal_dirty a buffer more than once. In fact, you + * can even journal_access a buffer after you've done a + * journal_access/journal_dirty pair. The only thing you cannot do + * however, is journal_dirty a buffer which you haven't yet passed to + * journal_access at least once. + * + * That said, 99% of the time this doesn't matter and this is what the + * path looks like: + * + * <read a bh> + * ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE); + * <modify the bh> + * ocfs2_journal_dirty(handle, bh); + */ +int ocfs2_journal_dirty(struct ocfs2_journal_handle *handle, + struct buffer_head *bh); +int ocfs2_journal_dirty_data(handle_t *handle, + struct buffer_head *bh); +int ocfs2_handle_add_lock(struct ocfs2_journal_handle *handle, + struct inode *inode); +/* + * Use this to protect from other processes reading buffer state while + * it's in flight. + */ +void ocfs2_handle_add_inode(struct ocfs2_journal_handle *handle, + struct inode *inode); + +/* + * Credit Macros: + * Convenience macros to calculate number of credits needed. + * + * For convenience sake, I have a set of macros here which calculate + * the *maximum* number of sectors which will be changed for various + * metadata updates. + */ + +/* simple file updates like chmod, etc. */ +#define OCFS2_INODE_UPDATE_CREDITS 1 + +/* get one bit out of a suballocator: dinode + group descriptor + + * prev. group desc. if we relink. */ +#define OCFS2_SUBALLOC_ALLOC (3) + +/* dinode + group descriptor update. We don't relink on free yet. */ +#define OCFS2_SUBALLOC_FREE (2) + +#define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS +#define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE \ + + OCFS2_TRUNCATE_LOG_UPDATE) + +/* data block for new dir/symlink, 2 for bitmap updates (bitmap fe + + * bitmap block for the new bit) */ +#define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + 2) + +/* parent fe, parent block, new file entry, inode alloc fe, inode alloc + * group descriptor + mkdir/symlink blocks */ +#define OCFS2_MKNOD_CREDITS (3 + OCFS2_SUBALLOC_ALLOC \ + + OCFS2_DIR_LINK_ADDITIONAL_CREDITS) + +/* local alloc metadata change + main bitmap updates */ +#define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \ + + OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE) + +/* used when we don't need an allocation change for a dir extend. One + * for the dinode, one for the new block. */ +#define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2) + +/* file update (nlink, etc) + dir entry block */ +#define OCFS2_LINK_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) + +/* inode + dir inode (if we unlink a dir), + dir entry block + orphan + * dir inode link */ +#define OCFS2_UNLINK_CREDITS (2 * OCFS2_INODE_UPDATE_CREDITS + 1 \ + + OCFS2_LINK_CREDITS) + +/* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry + + * inode alloc group descriptor */ +#define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 1 + 1) + +/* dinode update, old dir dinode update, new dir dinode update, old + * dir dir entry, new dir dir entry, dir entry update for renaming + * directory + target unlink */ +#define OCFS2_RENAME_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 3 \ + + OCFS2_UNLINK_CREDITS) + +static inline int ocfs2_calc_extend_credits(struct super_block *sb, + struct ocfs2_dinode *fe, + u32 bits_wanted) +{ + int bitmap_blocks, sysfile_bitmap_blocks, dinode_blocks; + + /* bitmap dinode, group desc. + relinked group. */ + bitmap_blocks = OCFS2_SUBALLOC_ALLOC; + + /* we might need to shift tree depth so lets assume an + * absolute worst case of complete fragmentation. Even with + * that, we only need one update for the dinode, and then + * however many metadata chunks needed * a remaining suballoc + * alloc. */ + sysfile_bitmap_blocks = 1 + + (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(fe); + + /* this does not include *new* metadata blocks, which are + * accounted for in sysfile_bitmap_blocks. fe + + * prev. last_eb_blk + blocks along edge of tree. + * calc_symlink_credits passes because we just need 1 + * credit for the dinode there. */ + dinode_blocks = 1 + 1 + le16_to_cpu(fe->id2.i_list.l_tree_depth); + + return bitmap_blocks + sysfile_bitmap_blocks + dinode_blocks; +} + +static inline int ocfs2_calc_symlink_credits(struct super_block *sb) +{ + int blocks = OCFS2_MKNOD_CREDITS; + + /* links can be longer than one block so we may update many + * within our single allocated extent. */ + blocks += ocfs2_clusters_to_blocks(sb, 1); + + return blocks; +} + +static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb, + unsigned int cpg) +{ + int blocks; + int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1; + /* parent inode update + new block group header + bitmap inode update + + bitmap blocks affected */ + blocks = 1 + 1 + 1 + bitmap_blocks; + return blocks; +} + +static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb, + unsigned int clusters_to_del, + struct ocfs2_dinode *fe, + struct ocfs2_extent_list *last_el) +{ + /* for dinode + all headers in this pass + update to next leaf */ + u16 next_free = le16_to_cpu(last_el->l_next_free_rec); + u16 tree_depth = le16_to_cpu(fe->id2.i_list.l_tree_depth); + int credits = 1 + tree_depth + 1; + int i; + + i = next_free - 1; + BUG_ON(i < 0); + + /* We may be deleting metadata blocks, so metadata alloc dinode + + one desc. block for each possible delete. */ + if (tree_depth && next_free == 1 && + le32_to_cpu(last_el->l_recs[i].e_clusters) == clusters_to_del) + credits += 1 + tree_depth; + + /* update to the truncate log. */ + credits += OCFS2_TRUNCATE_LOG_UPDATE; + + return credits; +} + +#endif /* OCFS2_JOURNAL_H */ diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c new file mode 100644 index 0000000..fe373a2 --- /dev/null +++ b/fs/ocfs2/localalloc.c @@ -0,0 +1,983 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * localalloc.c + * + * Node local data allocation + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/bitops.h> + +#define MLOG_MASK_PREFIX ML_DISK_ALLOC +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "suballoc.h" +#include "super.h" +#include "sysfile.h" + +#include "buffer_head_io.h" + +#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab)) + +static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb); + +static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc); + +static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, + struct ocfs2_dinode *alloc, + u32 numbits); + +static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc); + +static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_dinode *alloc, + struct inode *main_bm_inode, + struct buffer_head *main_bm_bh); + +static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context **ac, + struct inode **bitmap_inode, + struct buffer_head **bitmap_bh); + +static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac); + +static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, + struct inode *local_alloc_inode); + +/* + * Determine how large our local alloc window should be, in bits. + * + * These values (and the behavior in ocfs2_alloc_should_use_local) have + * been chosen so that most allocations, including new block groups go + * through local alloc. + */ +static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb) +{ + BUG_ON(osb->s_clustersize_bits < 12); + + return 2048 >> (osb->s_clustersize_bits - 12); +} + +/* + * Tell us whether a given allocation should use the local alloc + * file. Otherwise, it has to go to the main bitmap. + */ +int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits) +{ + int la_bits = ocfs2_local_alloc_window_bits(osb); + + if (osb->local_alloc_state != OCFS2_LA_ENABLED) + return 0; + + /* la_bits should be at least twice the size (in clusters) of + * a new block group. We want to be sure block group + * allocations go through the local alloc, so allow an + * allocation to take up to half the bitmap. */ + if (bits > (la_bits / 2)) + return 0; + + return 1; +} + +int ocfs2_load_local_alloc(struct ocfs2_super *osb) +{ + int status = 0; + struct ocfs2_dinode *alloc = NULL; + struct buffer_head *alloc_bh = NULL; + u32 num_used; + struct inode *inode = NULL; + struct ocfs2_local_alloc *la; + + mlog_entry_void(); + + /* read the alloc off disk */ + inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE, + osb->slot_num); + if (!inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, + &alloc_bh, 0, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + alloc = (struct ocfs2_dinode *) alloc_bh->b_data; + la = OCFS2_LOCAL_ALLOC(alloc); + + if (!(le32_to_cpu(alloc->i_flags) & + (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) { + mlog(ML_ERROR, "Invalid local alloc inode, %"MLFu64"\n", + OCFS2_I(inode)->ip_blkno); + status = -EINVAL; + goto bail; + } + + if ((la->la_size == 0) || + (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) { + mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n", + le16_to_cpu(la->la_size)); + status = -EINVAL; + goto bail; + } + + /* do a little verification. */ + num_used = ocfs2_local_alloc_count_bits(alloc); + + /* hopefully the local alloc has always been recovered before + * we load it. */ + if (num_used + || alloc->id1.bitmap1.i_used + || alloc->id1.bitmap1.i_total + || la->la_bm_off) + mlog(ML_ERROR, "Local alloc hasn't been recovered!\n" + "found = %u, set = %u, taken = %u, off = %u\n", + num_used, le32_to_cpu(alloc->id1.bitmap1.i_used), + le32_to_cpu(alloc->id1.bitmap1.i_total), + OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); + + osb->local_alloc_bh = alloc_bh; + osb->local_alloc_state = OCFS2_LA_ENABLED; + +bail: + if (status < 0) + if (alloc_bh) + brelse(alloc_bh); + if (inode) + iput(inode); + + mlog_exit(status); + return status; +} + +/* + * return any unused bits to the bitmap and write out a clean + * local_alloc. + * + * local_alloc_bh is optional. If not passed, we will simply use the + * one off osb. If you do pass it however, be warned that it *will* be + * returned brelse'd and NULL'd out.*/ +void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb) +{ + int status; + struct ocfs2_journal_handle *handle = NULL; + struct inode *local_alloc_inode = NULL; + struct buffer_head *bh = NULL; + struct buffer_head *main_bm_bh = NULL; + struct inode *main_bm_inode = NULL; + struct ocfs2_dinode *alloc_copy = NULL; + struct ocfs2_dinode *alloc = NULL; + + mlog_entry_void(); + + if (osb->local_alloc_state == OCFS2_LA_UNUSED) + goto bail; + + local_alloc_inode = + ocfs2_get_system_file_inode(osb, + LOCAL_ALLOC_SYSTEM_INODE, + osb->slot_num); + if (!local_alloc_inode) { + status = -ENOENT; + mlog_errno(status); + goto bail; + } + + osb->local_alloc_state = OCFS2_LA_DISABLED; + + handle = ocfs2_alloc_handle(osb); + if (!handle) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + main_bm_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!main_bm_inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + ocfs2_handle_add_inode(handle, main_bm_inode); + status = ocfs2_meta_lock(main_bm_inode, handle, &main_bm_bh, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* WINDOW_MOVE_CREDITS is a bit heavy... */ + handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); + if (IS_ERR(handle)) { + mlog_errno(PTR_ERR(handle)); + handle = NULL; + goto bail; + } + + bh = osb->local_alloc_bh; + alloc = (struct ocfs2_dinode *) bh->b_data; + + alloc_copy = kmalloc(bh->b_size, GFP_KERNEL); + if (!alloc_copy) { + status = -ENOMEM; + goto bail; + } + memcpy(alloc_copy, alloc, bh->b_size); + + status = ocfs2_journal_access(handle, local_alloc_inode, bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_clear_local_alloc(alloc); + + status = ocfs2_journal_dirty(handle, bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + brelse(bh); + osb->local_alloc_bh = NULL; + osb->local_alloc_state = OCFS2_LA_UNUSED; + + status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, + main_bm_inode, main_bm_bh); + if (status < 0) + mlog_errno(status); + +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (main_bm_bh) + brelse(main_bm_bh); + + if (main_bm_inode) + iput(main_bm_inode); + + if (local_alloc_inode) + iput(local_alloc_inode); + + if (alloc_copy) + kfree(alloc_copy); + + mlog_exit_void(); +} + +/* + * We want to free the bitmap bits outside of any recovery context as + * we'll need a cluster lock to do so, but we must clear the local + * alloc before giving up the recovered nodes journal. To solve this, + * we kmalloc a copy of the local alloc before it's change for the + * caller to process with ocfs2_complete_local_alloc_recovery + */ +int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb, + int slot_num, + struct ocfs2_dinode **alloc_copy) +{ + int status = 0; + struct buffer_head *alloc_bh = NULL; + struct inode *inode = NULL; + struct ocfs2_dinode *alloc; + + mlog_entry("(slot_num = %d)\n", slot_num); + + *alloc_copy = NULL; + + inode = ocfs2_get_system_file_inode(osb, + LOCAL_ALLOC_SYSTEM_INODE, + slot_num); + if (!inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + down(&inode->i_sem); + + status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, + &alloc_bh, 0, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL); + if (!(*alloc_copy)) { + status = -ENOMEM; + goto bail; + } + memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size); + + alloc = (struct ocfs2_dinode *) alloc_bh->b_data; + ocfs2_clear_local_alloc(alloc); + + status = ocfs2_write_block(osb, alloc_bh, inode); + if (status < 0) + mlog_errno(status); + +bail: + if ((status < 0) && (*alloc_copy)) { + kfree(*alloc_copy); + *alloc_copy = NULL; + } + + if (alloc_bh) + brelse(alloc_bh); + + if (inode) { + up(&inode->i_sem); + iput(inode); + } + + mlog_exit(status); + return status; +} + +/* + * Step 2: By now, we've completed the journal recovery, we've stamped + * a clean local alloc on disk and dropped the node out of the + * recovery map. Dlm locks will no longer stall, so lets clear out the + * main bitmap. + */ +int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb, + struct ocfs2_dinode *alloc) +{ + int status; + struct ocfs2_journal_handle *handle = NULL; + struct buffer_head *main_bm_bh = NULL; + struct inode *main_bm_inode = NULL; + + mlog_entry_void(); + + handle = ocfs2_alloc_handle(osb); + if (!handle) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + main_bm_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!main_bm_inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + ocfs2_handle_add_inode(handle, main_bm_inode); + status = ocfs2_meta_lock(main_bm_inode, handle, &main_bm_bh, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + /* we want the bitmap change to be recorded on disk asap */ + ocfs2_handle_set_sync(handle, 1); + + status = ocfs2_sync_local_to_main(osb, handle, alloc, + main_bm_inode, main_bm_bh); + if (status < 0) + mlog_errno(status); + +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (main_bm_bh) + brelse(main_bm_bh); + + if (main_bm_inode) + iput(main_bm_inode); + + mlog_exit(status); + return status; +} + +/* + * make sure we've got at least bitswanted contiguous bits in the + * local alloc. You lose them when you drop i_sem. + * + * We will add ourselves to the transaction passed in, but may start + * our own in order to shift windows. + */ +int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb, + struct ocfs2_journal_handle *passed_handle, + u32 bits_wanted, + struct ocfs2_alloc_context *ac) +{ + int status; + struct ocfs2_dinode *alloc; + struct inode *local_alloc_inode; + unsigned int free_bits; + + mlog_entry_void(); + + BUG_ON(!passed_handle); + BUG_ON(!ac); + BUG_ON(passed_handle->flags & OCFS2_HANDLE_STARTED); + + local_alloc_inode = + ocfs2_get_system_file_inode(osb, + LOCAL_ALLOC_SYSTEM_INODE, + osb->slot_num); + if (!local_alloc_inode) { + status = -ENOENT; + mlog_errno(status); + goto bail; + } + ocfs2_handle_add_inode(passed_handle, local_alloc_inode); + + if (osb->local_alloc_state != OCFS2_LA_ENABLED) { + status = -ENOSPC; + goto bail; + } + + if (bits_wanted > ocfs2_local_alloc_window_bits(osb)) { + mlog(0, "Asking for more than my max window size!\n"); + status = -ENOSPC; + goto bail; + } + + alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; + + if (le32_to_cpu(alloc->id1.bitmap1.i_used) != + ocfs2_local_alloc_count_bits(alloc)) { + ocfs2_error(osb->sb, "local alloc inode %"MLFu64" says it has " + "%u free bits, but a count shows %u", + le64_to_cpu(alloc->i_blkno), + le32_to_cpu(alloc->id1.bitmap1.i_used), + ocfs2_local_alloc_count_bits(alloc)); + status = -EIO; + goto bail; + } + + free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) - + le32_to_cpu(alloc->id1.bitmap1.i_used); + if (bits_wanted > free_bits) { + /* uhoh, window change time. */ + status = + ocfs2_local_alloc_slide_window(osb, local_alloc_inode); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + } + + ac->ac_inode = igrab(local_alloc_inode); + get_bh(osb->local_alloc_bh); + ac->ac_bh = osb->local_alloc_bh; + ac->ac_which = OCFS2_AC_USE_LOCAL; + status = 0; +bail: + if (local_alloc_inode) + iput(local_alloc_inode); + + mlog_exit(status); + return status; +} + +int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 min_bits, + u32 *bit_off, + u32 *num_bits) +{ + int status, start; + struct inode *local_alloc_inode; + u32 bits_wanted; + void *bitmap; + struct ocfs2_dinode *alloc; + struct ocfs2_local_alloc *la; + + mlog_entry_void(); + BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL); + + bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given; + local_alloc_inode = ac->ac_inode; + alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; + la = OCFS2_LOCAL_ALLOC(alloc); + + start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted); + if (start == -1) { + /* TODO: Shouldn't we just BUG here? */ + status = -ENOSPC; + mlog_errno(status); + goto bail; + } + + bitmap = la->la_bitmap; + *bit_off = le32_to_cpu(la->la_bm_off) + start; + /* local alloc is always contiguous by nature -- we never + * delete bits from it! */ + *num_bits = bits_wanted; + + status = ocfs2_journal_access(handle, local_alloc_inode, + osb->local_alloc_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + while(bits_wanted--) + ocfs2_set_bit(start++, bitmap); + + alloc->id1.bitmap1.i_used = cpu_to_le32(*num_bits + + le32_to_cpu(alloc->id1.bitmap1.i_used)); + + status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc) +{ + int i; + u8 *buffer; + u32 count = 0; + struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); + + mlog_entry_void(); + + buffer = la->la_bitmap; + for (i = 0; i < le16_to_cpu(la->la_size); i++) + count += hweight8(buffer[i]); + + mlog_exit(count); + return count; +} + +static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, + struct ocfs2_dinode *alloc, + u32 numbits) +{ + int numfound, bitoff, left, startoff, lastzero; + void *bitmap = NULL; + + mlog_entry("(numbits wanted = %u)\n", numbits); + + if (!alloc->id1.bitmap1.i_total) { + mlog(0, "No bits in my window!\n"); + bitoff = -1; + goto bail; + } + + bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap; + + numfound = bitoff = startoff = 0; + lastzero = -1; + left = le32_to_cpu(alloc->id1.bitmap1.i_total); + while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) { + if (bitoff == left) { + /* mlog(0, "bitoff (%d) == left", bitoff); */ + break; + } + /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, " + "numfound = %d\n", bitoff, startoff, numfound);*/ + + /* Ok, we found a zero bit... is it contig. or do we + * start over?*/ + if (bitoff == startoff) { + /* we found a zero */ + numfound++; + startoff++; + } else { + /* got a zero after some ones */ + numfound = 1; + startoff = bitoff+1; + } + /* we got everything we needed */ + if (numfound == numbits) { + /* mlog(0, "Found it all!\n"); */ + break; + } + } + + mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff, + numfound); + + if (numfound == numbits) + bitoff = startoff - numfound; + else + bitoff = -1; + +bail: + mlog_exit(bitoff); + return bitoff; +} + +static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc) +{ + struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); + int i; + mlog_entry_void(); + + alloc->id1.bitmap1.i_total = 0; + alloc->id1.bitmap1.i_used = 0; + la->la_bm_off = 0; + for(i = 0; i < le16_to_cpu(la->la_size); i++) + la->la_bitmap[i] = 0; + + mlog_exit_void(); +} + +#if 0 +/* turn this on and uncomment below to aid debugging window shifts. */ +static void ocfs2_verify_zero_bits(unsigned long *bitmap, + unsigned int start, + unsigned int count) +{ + unsigned int tmp = count; + while(tmp--) { + if (ocfs2_test_bit(start + tmp, bitmap)) { + printk("ocfs2_verify_zero_bits: start = %u, count = " + "%u\n", start, count); + printk("ocfs2_verify_zero_bits: bit %u is set!", + start + tmp); + BUG(); + } + } +} +#endif + +/* + * sync the local alloc to main bitmap. + * + * assumes you've already locked the main bitmap -- the bitmap inode + * passed is used for caching. + */ +static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_dinode *alloc, + struct inode *main_bm_inode, + struct buffer_head *main_bm_bh) +{ + int status = 0; + int bit_off, left, count, start; + u64 la_start_blk; + u64 blkno; + void *bitmap; + struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); + + mlog_entry("total = %u, COUNT = %u, used = %u\n", + le32_to_cpu(alloc->id1.bitmap1.i_total), + ocfs2_local_alloc_count_bits(alloc), + le32_to_cpu(alloc->id1.bitmap1.i_used)); + + if (!alloc->id1.bitmap1.i_total) { + mlog(0, "nothing to sync!\n"); + goto bail; + } + + if (le32_to_cpu(alloc->id1.bitmap1.i_used) == + le32_to_cpu(alloc->id1.bitmap1.i_total)) { + mlog(0, "all bits were taken!\n"); + goto bail; + } + + la_start_blk = ocfs2_clusters_to_blocks(osb->sb, + le32_to_cpu(la->la_bm_off)); + bitmap = la->la_bitmap; + start = count = bit_off = 0; + left = le32_to_cpu(alloc->id1.bitmap1.i_total); + + while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start)) + != -1) { + if ((bit_off < left) && (bit_off == start)) { + count++; + start++; + continue; + } + if (count) { + blkno = la_start_blk + + ocfs2_clusters_to_blocks(osb->sb, + start - count); + + mlog(0, "freeing %u bits starting at local " + "alloc bit %u (la_start_blk = %"MLFu64", " + "blkno = %"MLFu64")\n", count, start - count, + la_start_blk, blkno); + + status = ocfs2_free_clusters(handle, main_bm_inode, + main_bm_bh, blkno, count); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + if (bit_off >= left) + break; + count = 1; + start = bit_off + 1; + } + +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context **ac, + struct inode **bitmap_inode, + struct buffer_head **bitmap_bh) +{ + int status; + + *ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL); + if (!(*ac)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_handle = handle; + (*ac)->ac_bits_wanted = ocfs2_local_alloc_window_bits(osb); + + status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + *bitmap_inode = (*ac)->ac_inode; + igrab(*bitmap_inode); + *bitmap_bh = (*ac)->ac_bh; + get_bh(*bitmap_bh); + status = 0; +bail: + if ((status < 0) && *ac) { + ocfs2_free_alloc_context(*ac); + *ac = NULL; + } + + mlog_exit(status); + return status; +} + +/* + * pass it the bitmap lock in lock_bh if you have it. + */ +static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac) +{ + int status = 0; + u32 cluster_off, cluster_count; + struct ocfs2_dinode *alloc = NULL; + struct ocfs2_local_alloc *la; + + mlog_entry_void(); + + alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; + la = OCFS2_LOCAL_ALLOC(alloc); + + if (alloc->id1.bitmap1.i_total) + mlog(0, "asking me to alloc a new window over a non-empty " + "one\n"); + + mlog(0, "Allocating %u clusters for a new window.\n", + ocfs2_local_alloc_window_bits(osb)); + /* we used the generic suballoc reserve function, but we set + * everything up nicely, so there's no reason why we can't use + * the more specific cluster api to claim bits. */ + status = ocfs2_claim_clusters(osb, handle, ac, + ocfs2_local_alloc_window_bits(osb), + &cluster_off, &cluster_count); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + la->la_bm_off = cpu_to_le32(cluster_off); + alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count); + /* just in case... In the future when we find space ourselves, + * we don't have to get all contiguous -- but we'll have to + * set all previously used bits in bitmap and update + * la_bits_set before setting the bits in the main bitmap. */ + alloc->id1.bitmap1.i_used = 0; + memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0, + le16_to_cpu(la->la_size)); + + mlog(0, "New window allocated:\n"); + mlog(0, "window la_bm_off = %u\n", + OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); + mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total)); + +bail: + mlog_exit(status); + return status; +} + +/* Note that we do *NOT* lock the local alloc inode here as + * it's been locked already for us. */ +static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, + struct inode *local_alloc_inode) +{ + int status = 0; + struct buffer_head *main_bm_bh = NULL; + struct inode *main_bm_inode = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_dinode *alloc; + struct ocfs2_dinode *alloc_copy = NULL; + struct ocfs2_alloc_context *ac = NULL; + + mlog_entry_void(); + + handle = ocfs2_alloc_handle(osb); + if (!handle) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* This will lock the main bitmap for us. */ + status = ocfs2_local_alloc_reserve_for_window(osb, + handle, + &ac, + &main_bm_inode, + &main_bm_bh); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; + + /* We want to clear the local alloc before doing anything + * else, so that if we error later during this operation, + * local alloc shutdown won't try to double free main bitmap + * bits. Make a copy so the sync function knows which bits to + * free. */ + alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_KERNEL); + if (!alloc_copy) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size); + + status = ocfs2_journal_access(handle, local_alloc_inode, + osb->local_alloc_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_clear_local_alloc(alloc); + + status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, + main_bm_inode, main_bm_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_local_alloc_new_window(osb, handle, ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + atomic_inc(&osb->alloc_stats.moves); + + status = 0; +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (main_bm_bh) + brelse(main_bm_bh); + + if (main_bm_inode) + iput(main_bm_inode); + + if (alloc_copy) + kfree(alloc_copy); + + if (ac) + ocfs2_free_alloc_context(ac); + + mlog_exit(status); + return status; +} + diff --git a/fs/ocfs2/localalloc.h b/fs/ocfs2/localalloc.h new file mode 100644 index 0000000..30f88ce --- /dev/null +++ b/fs/ocfs2/localalloc.h @@ -0,0 +1,56 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * localalloc.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_LOCALALLOC_H +#define OCFS2_LOCALALLOC_H + +int ocfs2_load_local_alloc(struct ocfs2_super *osb); + +void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb); + +int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb, + int node_num, + struct ocfs2_dinode **alloc_copy); + +int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb, + struct ocfs2_dinode *alloc); + +int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, + u64 bits); + +struct ocfs2_alloc_context; +int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb, + struct ocfs2_journal_handle *passed_handle, + u32 bits_wanted, + struct ocfs2_alloc_context *ac); + +int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 min_bits, + u32 *bit_off, + u32 *num_bits); + +#endif /* OCFS2_LOCALALLOC_H */ diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c new file mode 100644 index 0000000..afdeec4 --- /dev/null +++ b/fs/ocfs2/mmap.c @@ -0,0 +1,102 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * mmap.c + * + * Code to deal with the mess that is clustered mmap. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/uio.h> +#include <linux/signal.h> +#include <linux/rbtree.h> + +#define MLOG_MASK_PREFIX ML_FILE_IO +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "dlmglue.h" +#include "file.h" +#include "inode.h" +#include "mmap.h" + +static struct page *ocfs2_nopage(struct vm_area_struct * area, + unsigned long address, + int *type) +{ + struct inode *inode = area->vm_file->f_dentry->d_inode; + struct page *page = NOPAGE_SIGBUS; + sigset_t blocked, oldset; + int ret; + + mlog_entry("(inode %lu, address %lu)\n", inode->i_ino, address); + + /* The best way to deal with signals in this path is + * to block them upfront, rather than allowing the + * locking paths to return -ERESTARTSYS. */ + sigfillset(&blocked); + + /* We should technically never get a bad ret return + * from sigprocmask */ + ret = sigprocmask(SIG_BLOCK, &blocked, &oldset); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + page = filemap_nopage(area, address, type); + + ret = sigprocmask(SIG_SETMASK, &oldset, NULL); + if (ret < 0) + mlog_errno(ret); +out: + mlog_exit_ptr(page); + return page; +} + +static struct vm_operations_struct ocfs2_file_vm_ops = { + .nopage = ocfs2_nopage, +}; + +int ocfs2_mmap(struct file *file, + struct vm_area_struct *vma) +{ + struct address_space *mapping = file->f_dentry->d_inode->i_mapping; + struct inode *inode = mapping->host; + + /* We don't want to support shared writable mappings yet. */ + if (((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE)) + && ((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) { + mlog(0, "disallow shared writable mmaps %lx\n", vma->vm_flags); + /* This is -EINVAL because generic_file_readonly_mmap + * returns it in a similar situation. */ + return -EINVAL; + } + + update_atime(inode); + vma->vm_ops = &ocfs2_file_vm_ops; + return 0; +} + diff --git a/fs/ocfs2/mmap.h b/fs/ocfs2/mmap.h new file mode 100644 index 0000000..1274ee0f --- /dev/null +++ b/fs/ocfs2/mmap.h @@ -0,0 +1,6 @@ +#ifndef OCFS2_MMAP_H +#define OCFS2_MMAP_H + +int ocfs2_mmap(struct file *file, struct vm_area_struct *vma); + +#endif /* OCFS2_MMAP_H */ diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c new file mode 100644 index 0000000..f6b77ff1 --- /dev/null +++ b/fs/ocfs2/namei.c @@ -0,0 +1,2264 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * namei.c + * + * Create and rename file, directory, symlinks + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * Portions of this code from linux/fs/ext3/dir.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/dir.c + * + * Copyright (C) 1991, 1992 Linux Torvalds + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#define MLOG_MASK_PREFIX ML_NAMEI +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dcache.h" +#include "dir.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "namei.h" +#include "suballoc.h" +#include "symlink.h" +#include "sysfile.h" +#include "uptodate.h" +#include "vote.h" + +#include "buffer_head_io.h" + +#define NAMEI_RA_CHUNKS 2 +#define NAMEI_RA_BLOCKS 4 +#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) +#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) + +static int inline ocfs2_search_dirblock(struct buffer_head *bh, + struct inode *dir, + const char *name, int namelen, + unsigned long offset, + struct ocfs2_dir_entry **res_dir); + +static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + struct ocfs2_dir_entry *de_del, + struct buffer_head *bh); + +static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + const char *name, int namelen, + struct inode *inode, u64 blkno, + struct buffer_head *parent_fe_bh, + struct buffer_head *insert_bh); + +static int ocfs2_mknod_locked(struct ocfs2_super *osb, + struct inode *dir, + struct dentry *dentry, int mode, + dev_t dev, + struct buffer_head **new_fe_bh, + struct buffer_head *parent_fe_bh, + struct ocfs2_journal_handle *handle, + struct inode **ret_inode, + struct ocfs2_alloc_context *inode_ac); + +static int ocfs2_fill_new_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *parent, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_alloc_context *data_ac); + +static int ocfs2_double_lock(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct buffer_head **bh1, + struct inode *inode1, + struct buffer_head **bh2, + struct inode *inode2); + +static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + char *name, + struct buffer_head **de_bh); + +static int ocfs2_orphan_add(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct ocfs2_dinode *fe, + char *name, + struct buffer_head *de_bh); + +static int ocfs2_create_symlink_data(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + const char *symname); + +static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle, + struct dentry *dentry, + struct inode *inode, u64 blkno, + struct buffer_head *parent_fe_bh, + struct buffer_head *insert_bh) +{ + return __ocfs2_add_entry(handle, dentry->d_parent->d_inode, + dentry->d_name.name, dentry->d_name.len, + inode, blkno, parent_fe_bh, insert_bh); +} + +/* An orphan dir name is an 8 byte value, printed as a hex string */ +#define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64))) + +static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + int status; + u64 blkno; + struct buffer_head *dirent_bh = NULL; + struct inode *inode = NULL; + struct dentry *ret; + struct ocfs2_dir_entry *dirent; + struct ocfs2_inode_info *oi; + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, + dentry->d_name.len, dentry->d_name.name); + + if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) { + ret = ERR_PTR(-ENAMETOOLONG); + goto bail; + } + + mlog(0, "find name %.*s in directory %"MLFu64"\n", dentry->d_name.len, + dentry->d_name.name, OCFS2_I(dir)->ip_blkno); + + status = ocfs2_meta_lock(dir, NULL, NULL, 0); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + ret = ERR_PTR(status); + goto bail; + } + + status = ocfs2_find_files_on_disk(dentry->d_name.name, + dentry->d_name.len, &blkno, + dir, &dirent_bh, &dirent); + if (status < 0) + goto bail_add; + + inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno); + if (IS_ERR(inode)) { + mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno); + ret = ERR_PTR(-EACCES); + goto bail_unlock; + } + + oi = OCFS2_I(inode); + /* Clear any orphaned state... If we were able to look up the + * inode from a directory, it certainly can't be orphaned. We + * might have the bad state from a node which intended to + * orphan this inode but crashed before it could commit the + * unlink. */ + spin_lock(&oi->ip_lock); + oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED; + oi->ip_orphaned_slot = OCFS2_INVALID_SLOT; + spin_unlock(&oi->ip_lock); + +bail_add: + + dentry->d_op = &ocfs2_dentry_ops; + ret = d_splice_alias(inode, dentry); + +bail_unlock: + /* Don't drop the cluster lock until *after* the d_add -- + * unlink on another node will message us to remove that + * dentry under this lock so otherwise we can race this with + * the vote thread and have a stale dentry. */ + ocfs2_meta_unlock(dir, 0); + +bail: + if (dirent_bh) + brelse(dirent_bh); + + mlog_exit_ptr(ret); + + return ret; +} + +static int ocfs2_fill_new_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *parent, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_alloc_context *data_ac) +{ + int status; + struct buffer_head *new_bh = NULL; + struct ocfs2_dir_entry *de = NULL; + + mlog_entry_void(); + + status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, + data_ac, NULL, &new_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_set_new_buffer_uptodate(inode, new_bh); + + status = ocfs2_journal_access(handle, inode, new_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + memset(new_bh->b_data, 0, osb->sb->s_blocksize); + + de = (struct ocfs2_dir_entry *) new_bh->b_data; + de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); + de->name_len = 1; + de->rec_len = + cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); + strcpy(de->name, "."); + ocfs2_set_de_type(de, S_IFDIR); + de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); + de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); + de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize - + OCFS2_DIR_REC_LEN(1)); + de->name_len = 2; + strcpy(de->name, ".."); + ocfs2_set_de_type(de, S_IFDIR); + + status = ocfs2_journal_dirty(handle, new_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + i_size_write(inode, inode->i_sb->s_blocksize); + inode->i_nlink = 2; + inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize); + status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + if (new_bh) + brelse(new_bh); + + mlog_exit(status); + return status; +} + +static int ocfs2_mknod(struct inode *dir, + struct dentry *dentry, + int mode, + dev_t dev) +{ + int status = 0; + struct buffer_head *parent_fe_bh = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_super *osb; + struct ocfs2_dinode *dirfe; + struct buffer_head *new_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct inode *inode = NULL; + struct ocfs2_alloc_context *inode_ac = NULL; + struct ocfs2_alloc_context *data_ac = NULL; + + mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, + (unsigned long)dev, dentry->d_name.len, + dentry->d_name.name); + + /* get our super block */ + osb = OCFS2_SB(dir->i_sb); + + if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) { + mlog(ML_ERROR, "inode %"MLFu64" has i_nlink of %u\n", + OCFS2_I(dir)->ip_blkno, dir->i_nlink); + status = -EMLINK; + goto leave; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + + status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + if (!dirfe->i_links_count) { + /* can't make a file in a deleted directory. */ + status = -ENOENT; + goto leave; + } + + status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (status) + goto leave; + + /* get a spot inside the dir. */ + status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* reserve an inode spot */ + status = ocfs2_reserve_new_inode(osb, handle, &inode_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + /* are we making a directory? If so, reserve a cluster for his + * 1st extent. */ + if (S_ISDIR(mode)) { + status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto leave; + } + + /* do the real work now. */ + status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev, + &new_fe_bh, parent_fe_bh, handle, + &inode, inode_ac); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(mode)) { + status = ocfs2_fill_new_dir(osb, handle, dir, inode, + new_fe_bh, data_ac); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, dir, parent_fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + le16_add_cpu(&dirfe->i_links_count, 1); + status = ocfs2_journal_dirty(handle, parent_fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + dir->i_nlink++; + } + + status = ocfs2_add_entry(handle, dentry, inode, + OCFS2_I(inode)->ip_blkno, parent_fe_bh, + de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + insert_inode_hash(inode); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); + status = 0; +leave: + if (handle) + ocfs2_commit_trans(handle); + + if (status == -ENOSPC) + mlog(0, "Disk is full\n"); + + if (new_fe_bh) + brelse(new_fe_bh); + + if (de_bh) + brelse(de_bh); + + if (parent_fe_bh) + brelse(parent_fe_bh); + + if ((status < 0) && inode) + iput(inode); + + if (inode_ac) + ocfs2_free_alloc_context(inode_ac); + + if (data_ac) + ocfs2_free_alloc_context(data_ac); + + mlog_exit(status); + + return status; +} + +static int ocfs2_mknod_locked(struct ocfs2_super *osb, + struct inode *dir, + struct dentry *dentry, int mode, + dev_t dev, + struct buffer_head **new_fe_bh, + struct buffer_head *parent_fe_bh, + struct ocfs2_journal_handle *handle, + struct inode **ret_inode, + struct ocfs2_alloc_context *inode_ac) +{ + int status = 0; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_extent_list *fel; + u64 fe_blkno = 0; + u16 suballoc_bit; + struct inode *inode = NULL; + + mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, + (unsigned long)dev, dentry->d_name.len, + dentry->d_name.name); + + *new_fe_bh = NULL; + *ret_inode = NULL; + + status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit, + &fe_blkno); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + inode = new_inode(dir->i_sb); + if (IS_ERR(inode)) { + status = PTR_ERR(inode); + mlog(ML_ERROR, "new_inode failed!\n"); + goto leave; + } + + /* populate as many fields early on as possible - many of + * these are used by the support functions here and in + * callers. */ + inode->i_ino = ino_from_blkno(osb->sb, fe_blkno); + OCFS2_I(inode)->ip_blkno = fe_blkno; + if (S_ISDIR(mode)) + inode->i_nlink = 2; + else + inode->i_nlink = 1; + inode->i_mode = mode; + spin_lock(&osb->osb_lock); + inode->i_generation = osb->s_next_generation++; + spin_unlock(&osb->osb_lock); + + *new_fe_bh = sb_getblk(osb->sb, fe_blkno); + if (!*new_fe_bh) { + status = -EIO; + mlog_errno(status); + goto leave; + } + ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh); + + status = ocfs2_journal_access(handle, inode, *new_fe_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data; + memset(fe, 0, osb->sb->s_blocksize); + + fe->i_generation = cpu_to_le32(inode->i_generation); + fe->i_fs_generation = cpu_to_le32(osb->fs_generation); + fe->i_blkno = cpu_to_le64(fe_blkno); + fe->i_suballoc_bit = cpu_to_le16(suballoc_bit); + fe->i_suballoc_slot = cpu_to_le16(osb->slot_num); + fe->i_uid = cpu_to_le32(current->fsuid); + if (dir->i_mode & S_ISGID) { + fe->i_gid = cpu_to_le32(dir->i_gid); + if (S_ISDIR(mode)) + mode |= S_ISGID; + } else + fe->i_gid = cpu_to_le32(current->fsgid); + fe->i_mode = cpu_to_le16(mode); + if (S_ISCHR(mode) || S_ISBLK(mode)) + fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev)); + + fe->i_links_count = cpu_to_le16(inode->i_nlink); + + fe->i_last_eb_blk = 0; + strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE); + le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL); + fe->i_atime = fe->i_ctime = fe->i_mtime = + cpu_to_le64(CURRENT_TIME.tv_sec); + fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec = + cpu_to_le32(CURRENT_TIME.tv_nsec); + fe->i_dtime = 0; + + fel = &fe->id2.i_list; + fel->l_tree_depth = 0; + fel->l_next_free_rec = 0; + fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb)); + + status = ocfs2_journal_dirty(handle, *new_fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (ocfs2_populate_inode(inode, fe, 1) < 0) { + mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, " + "i_blkno=%"MLFu64", i_ino=%lu\n", + (unsigned long long) (*new_fe_bh)->b_blocknr, + fe->i_blkno, inode->i_ino); + BUG(); + } + + ocfs2_inode_set_new(osb, inode); + status = ocfs2_create_new_inode_locks(inode); + if (status < 0) + mlog_errno(status); + + status = 0; /* error in ocfs2_create_new_inode_locks is not + * critical */ + + *ret_inode = inode; +leave: + if (status < 0) { + if (*new_fe_bh) { + brelse(*new_fe_bh); + *new_fe_bh = NULL; + } + if (inode) + iput(inode); + } + + mlog_exit(status); + return status; +} + +static int ocfs2_mkdir(struct inode *dir, + struct dentry *dentry, + int mode) +{ + int ret; + + mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, + dentry->d_name.len, dentry->d_name.name); + ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0); + mlog_exit(ret); + + return ret; +} + +static int ocfs2_create(struct inode *dir, + struct dentry *dentry, + int mode, + struct nameidata *nd) +{ + int ret; + + mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, + dentry->d_name.len, dentry->d_name.name); + ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0); + mlog_exit(ret); + + return ret; +} + +static int ocfs2_link(struct dentry *old_dentry, + struct inode *dir, + struct dentry *dentry) +{ + struct ocfs2_journal_handle *handle = NULL; + struct inode *inode = old_dentry->d_inode; + int err; + struct buffer_head *fe_bh = NULL; + struct buffer_head *parent_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); + + mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino, + old_dentry->d_name.len, old_dentry->d_name.name, + dentry->d_name.len, dentry->d_name.name); + + if (S_ISDIR(inode->i_mode)) { + err = -EPERM; + goto bail; + } + + if (inode->i_nlink >= OCFS2_LINK_MAX) { + err = -EMLINK; + goto bail; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + err = -ENOMEM; + goto bail; + } + + err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (err < 0) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + + err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (err) + goto bail; + + err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (err < 0) { + mlog_errno(err); + goto bail; + } + + err = ocfs2_meta_lock(inode, handle, &fe_bh, 1); + if (err < 0) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) { + err = -EMLINK; + goto bail; + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + handle = NULL; + mlog_errno(err); + goto bail; + } + + err = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (err < 0) { + mlog_errno(err); + goto bail; + } + + inode->i_nlink++; + inode->i_ctime = CURRENT_TIME; + fe->i_links_count = cpu_to_le16(inode->i_nlink); + fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); + fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); + + err = ocfs2_journal_dirty(handle, fe_bh); + if (err < 0) { + le16_add_cpu(&fe->i_links_count, -1); + inode->i_nlink--; + mlog_errno(err); + goto bail; + } + + err = ocfs2_add_entry(handle, dentry, inode, + OCFS2_I(inode)->ip_blkno, + parent_fe_bh, de_bh); + if (err) { + le16_add_cpu(&fe->i_links_count, -1); + inode->i_nlink--; + mlog_errno(err); + goto bail; + } + + atomic_inc(&inode->i_count); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); +bail: + if (handle) + ocfs2_commit_trans(handle); + if (de_bh) + brelse(de_bh); + if (fe_bh) + brelse(fe_bh); + if (parent_fe_bh) + brelse(parent_fe_bh); + + mlog_exit(err); + + return err; +} + +static int ocfs2_unlink(struct inode *dir, + struct dentry *dentry) +{ + int status; + unsigned int saved_nlink = 0; + struct inode *inode = dentry->d_inode; + struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); + u64 blkno; + struct ocfs2_dinode *fe = NULL; + struct buffer_head *fe_bh = NULL; + struct buffer_head *parent_node_bh = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_dir_entry *dirent = NULL; + struct buffer_head *dirent_bh = NULL; + char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; + struct buffer_head *orphan_entry_bh = NULL; + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, + dentry->d_name.len, dentry->d_name.name); + + BUG_ON(dentry->d_parent->d_inode != dir); + + mlog(0, "ino = %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + if (inode == osb->root_inode) { + mlog(0, "Cannot delete the root directory\n"); + status = -EPERM; + goto leave; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + + status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + status = ocfs2_find_files_on_disk(dentry->d_name.name, + dentry->d_name.len, &blkno, + dir, &dirent_bh, &dirent); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + if (OCFS2_I(inode)->ip_blkno != blkno) { + status = -ENOENT; + + mlog(0, "ip_blkno (%"MLFu64") != dirent blkno (%"MLFu64") " + "ip_flags = %x\n", OCFS2_I(inode)->ip_blkno, blkno, + OCFS2_I(inode)->ip_flags); + goto leave; + } + + status = ocfs2_meta_lock(inode, handle, &fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(inode->i_mode)) { + if (!ocfs2_empty_dir(inode)) { + status = -ENOTEMPTY; + goto leave; + } else if (inode->i_nlink != 2) { + status = -ENOTEMPTY; + goto leave; + } + } + + /* There are still a few steps left until we can consider the + * unlink to have succeeded. Save off nlink here before + * modification so we can set it back in case we hit an issue + * before commit. */ + saved_nlink = inode->i_nlink; + if (S_ISDIR(inode->i_mode)) + inode->i_nlink = 0; + else + inode->i_nlink--; + + status = ocfs2_request_unlink_vote(inode, dentry, + (unsigned int) inode->i_nlink); + if (status < 0) { + /* This vote should succeed under all normal + * circumstances. */ + mlog_errno(status); + goto leave; + } + + if (!inode->i_nlink) { + status = ocfs2_prepare_orphan_dir(osb, handle, inode, + orphan_name, + &orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + if (!inode->i_nlink) { + status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name, + orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + } + + /* delete the name from the parent dir */ + status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* We can set nlink on the dinode now. clear the saved version + * so that it doesn't get set later. */ + fe->i_links_count = cpu_to_le16(inode->i_nlink); + saved_nlink = 0; + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(inode->i_mode)) { + dir->i_nlink--; + status = ocfs2_mark_inode_dirty(handle, dir, + parent_node_bh); + if (status < 0) { + mlog_errno(status); + dir->i_nlink++; + } + } + +leave: + if (status < 0 && saved_nlink) + inode->i_nlink = saved_nlink; + + if (handle) + ocfs2_commit_trans(handle); + + if (fe_bh) + brelse(fe_bh); + + if (dirent_bh) + brelse(dirent_bh); + + if (parent_node_bh) + brelse(parent_node_bh); + + if (orphan_entry_bh) + brelse(orphan_entry_bh); + + mlog_exit(status); + + return status; +} + +/* + * The only place this should be used is rename! + * if they have the same id, then the 1st one is the only one locked. + */ +static int ocfs2_double_lock(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct buffer_head **bh1, + struct inode *inode1, + struct buffer_head **bh2, + struct inode *inode2) +{ + int status; + struct ocfs2_inode_info *oi1 = OCFS2_I(inode1); + struct ocfs2_inode_info *oi2 = OCFS2_I(inode2); + struct buffer_head **tmpbh; + struct inode *tmpinode; + + mlog_entry("(inode1 = %"MLFu64", inode2 = %"MLFu64")\n", + oi1->ip_blkno, oi2->ip_blkno); + + BUG_ON(!handle); + + if (*bh1) + *bh1 = NULL; + if (*bh2) + *bh2 = NULL; + + /* we always want to lock the one with the lower lockid first. */ + if (oi1->ip_blkno != oi2->ip_blkno) { + if (oi1->ip_blkno < oi2->ip_blkno) { + /* switch id1 and id2 around */ + mlog(0, "switching them around...\n"); + tmpbh = bh2; + bh2 = bh1; + bh1 = tmpbh; + + tmpinode = inode2; + inode2 = inode1; + inode1 = tmpinode; + } + /* lock id2 */ + status = ocfs2_meta_lock(inode2, handle, bh2, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + } + /* lock id1 */ + status = ocfs2_meta_lock(inode1, handle, bh1, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } +bail: + mlog_exit(status); + return status; +} + +#define PARENT_INO(buffer) \ + ((struct ocfs2_dir_entry *) \ + ((char *)buffer + \ + le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode + +static int ocfs2_rename(struct inode *old_dir, + struct dentry *old_dentry, + struct inode *new_dir, + struct dentry *new_dentry) +{ + int status = 0, rename_lock = 0; + struct inode *old_inode = old_dentry->d_inode; + struct inode *new_inode = new_dentry->d_inode; + struct ocfs2_dinode *newfe = NULL; + char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; + struct buffer_head *orphan_entry_bh = NULL; + struct buffer_head *newfe_bh = NULL; + struct buffer_head *insert_entry_bh = NULL; + struct ocfs2_super *osb = NULL; + u64 newfe_blkno; + struct ocfs2_journal_handle *handle = NULL; + struct buffer_head *old_dir_bh = NULL; + struct buffer_head *new_dir_bh = NULL; + struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry + // and new_dentry + struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above + struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir, + // this is the 1st dirent bh + nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink; + unsigned int links_count; + + /* At some point it might be nice to break this function up a + * bit. */ + + mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n", + old_dir, old_dentry, new_dir, new_dentry, + old_dentry->d_name.len, old_dentry->d_name.name, + new_dentry->d_name.len, new_dentry->d_name.name); + + osb = OCFS2_SB(old_dir->i_sb); + + if (new_inode) { + if (!igrab(new_inode)) + BUG(); + } + + if (atomic_read(&old_dentry->d_count) > 2) { + shrink_dcache_parent(old_dentry); + if (atomic_read(&old_dentry->d_count) > 2) { + status = -EBUSY; + goto bail; + } + } + + /* Assume a directory heirarchy thusly: + * a/b/c + * a/d + * a,b,c, and d are all directories. + * + * from cwd of 'a' on both nodes: + * node1: mv b/c d + * node2: mv d b/c + * + * And that's why, just like the VFS, we need a file system + * rename lock. */ + if (old_dentry != new_dentry) { + status = ocfs2_rename_lock(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + rename_lock = 1; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* if old and new are the same, this'll just do one lock. */ + status = ocfs2_double_lock(osb, handle, + &old_dir_bh, old_dir, + &new_dir_bh, new_dir); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* make sure both dirs have bhs + * get an extra ref on old_dir_bh if old==new */ + if (!new_dir_bh) { + if (old_dir_bh) { + new_dir_bh = old_dir_bh; + get_bh(new_dir_bh); + } else { + mlog(ML_ERROR, "no old_dir_bh!\n"); + status = -EIO; + goto bail; + } + } + + if (S_ISDIR(old_inode->i_mode)) { + /* Directories actually require metadata updates to + * the directory info so we can't get away with not + * doing node locking on it. */ + status = ocfs2_meta_lock(old_inode, handle, NULL, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + status = ocfs2_request_rename_vote(old_inode, old_dentry); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = -EIO; + old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0); + if (!old_inode_de_bh) + goto bail; + + status = -EIO; + if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) != + OCFS2_I(old_dir)->ip_blkno) + goto bail; + status = -EMLINK; + if (!new_inode && new_dir!=old_dir && + new_dir->i_nlink >= OCFS2_LINK_MAX) + goto bail; + } else { + /* Ah, the simple case - we're a file so just send a + * message. */ + status = ocfs2_request_rename_vote(old_inode, old_dentry); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = -ENOENT; + old_de_bh = ocfs2_find_entry(old_dentry->d_name.name, + old_dentry->d_name.len, + old_dir, &old_de); + if (!old_de_bh) + goto bail; + + /* + * Check for inode number is _not_ due to possible IO errors. + * We might rmdir the source, keep it as pwd of some process + * and merrily kill the link to whatever was created under the + * same name. Goodbye sticky bit ;-< + */ + if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno) + goto bail; + + /* check if the target already exists (in which case we need + * to delete it */ + status = ocfs2_find_files_on_disk(new_dentry->d_name.name, + new_dentry->d_name.len, + &newfe_blkno, new_dir, &new_de_bh, + &new_de); + /* The only error we allow here is -ENOENT because the new + * file not existing is perfectly valid. */ + if ((status < 0) && (status != -ENOENT)) { + /* If we cannot find the file specified we should just */ + /* return the error... */ + mlog_errno(status); + goto bail; + } + + if (!new_de && new_inode) + mlog(ML_ERROR, "inode %lu does not exist in it's parent " + "directory!", new_inode->i_ino); + + /* In case we need to overwrite an existing file, we blow it + * away first */ + if (new_de) { + /* VFS didn't think there existed an inode here, but + * someone else in the cluster must have raced our + * rename to create one. Today we error cleanly, in + * the future we should consider calling iget to build + * a new struct inode for this entry. */ + if (!new_inode) { + status = -EACCES; + + mlog(0, "We found an inode for name %.*s but VFS " + "didn't give us one.\n", new_dentry->d_name.len, + new_dentry->d_name.name); + goto bail; + } + + if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) { + status = -EACCES; + + mlog(0, "Inode blkno (%"MLFu64") and dir (%"MLFu64") " + "disagree. ip_flags = %x\n", + OCFS2_I(new_inode)->ip_blkno, newfe_blkno, + OCFS2_I(new_inode)->ip_flags); + goto bail; + } + + status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode)) + links_count = 0; + else + links_count = (unsigned int) (new_inode->i_nlink - 1); + + status = ocfs2_request_unlink_vote(new_inode, new_dentry, + links_count); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + newfe = (struct ocfs2_dinode *) newfe_bh->b_data; + + mlog(0, "aha rename over existing... new_de=%p " + "new_blkno=%"MLFu64" newfebh=%p bhblocknr=%llu\n", + new_de, newfe_blkno, newfe_bh, newfe_bh ? + (unsigned long long)newfe_bh->b_blocknr : 0ULL); + + if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) { + status = ocfs2_prepare_orphan_dir(osb, handle, + new_inode, + orphan_name, + &orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + } else { + BUG_ON(new_dentry->d_parent->d_inode != new_dir); + + status = ocfs2_check_dir_for_entry(new_dir, + new_dentry->d_name.name, + new_dentry->d_name.len); + if (status) + goto bail; + + status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh, + new_dentry->d_name.name, + new_dentry->d_name.len, + &insert_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + if (new_de) { + if (S_ISDIR(new_inode->i_mode)) { + if (!ocfs2_empty_dir(new_inode) || + new_inode->i_nlink != 2) { + status = -ENOTEMPTY; + goto bail; + } + } + status = ocfs2_journal_access(handle, new_inode, newfe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode) || + (newfe->i_links_count == cpu_to_le16(1))){ + status = ocfs2_orphan_add(osb, handle, new_inode, + newfe, orphan_name, + orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* change the dirent to point to the correct inode */ + status = ocfs2_journal_access(handle, new_dir, new_de_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno); + new_de->file_type = old_de->file_type; + new_dir->i_version++; + status = ocfs2_journal_dirty(handle, new_de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode)) + newfe->i_links_count = 0; + else + le16_add_cpu(&newfe->i_links_count, -1); + + status = ocfs2_journal_dirty(handle, newfe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } else { + /* if the name was not found in new_dir, add it now */ + status = ocfs2_add_entry(handle, new_dentry, old_inode, + OCFS2_I(old_inode)->ip_blkno, + new_dir_bh, insert_entry_bh); + } + + old_inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(old_inode); + + /* now that the name has been added to new_dir, remove the old name */ + status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (new_inode) { + new_inode->i_nlink--; + new_inode->i_ctime = CURRENT_TIME; + } + old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; + if (old_inode_de_bh) { + status = ocfs2_journal_access(handle, old_inode, + old_inode_de_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + PARENT_INO(old_inode_de_bh->b_data) = + cpu_to_le64(OCFS2_I(new_dir)->ip_blkno); + status = ocfs2_journal_dirty(handle, old_inode_de_bh); + old_dir->i_nlink--; + if (new_inode) { + new_inode->i_nlink--; + } else { + new_dir->i_nlink++; + mark_inode_dirty(new_dir); + } + } + mark_inode_dirty(old_dir); + if (new_inode) + mark_inode_dirty(new_inode); + + if (old_dir != new_dir) + if (new_dir_nlink != new_dir->i_nlink) { + if (!new_dir_bh) { + mlog(ML_ERROR, "need to change nlink for new " + "dir %"MLFu64" from %d to %d but bh is " + "NULL\n", OCFS2_I(new_dir)->ip_blkno, + (int)new_dir_nlink, new_dir->i_nlink); + } else { + struct ocfs2_dinode *fe; + status = ocfs2_journal_access(handle, + new_dir, + new_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + fe = (struct ocfs2_dinode *) new_dir_bh->b_data; + fe->i_links_count = cpu_to_le16(new_dir->i_nlink); + status = ocfs2_journal_dirty(handle, new_dir_bh); + } + } + + if (old_dir_nlink != old_dir->i_nlink) { + if (!old_dir_bh) { + mlog(ML_ERROR, "need to change nlink for old dir " + "%"MLFu64" from %d to %d but bh is NULL!\n", + OCFS2_I(old_dir)->ip_blkno, + (int)old_dir_nlink, + old_dir->i_nlink); + } else { + struct ocfs2_dinode *fe; + status = ocfs2_journal_access(handle, old_dir, + old_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + fe = (struct ocfs2_dinode *) old_dir_bh->b_data; + fe->i_links_count = cpu_to_le16(old_dir->i_nlink); + status = ocfs2_journal_dirty(handle, old_dir_bh); + } + } + + status = 0; +bail: + if (rename_lock) + ocfs2_rename_unlock(osb); + + if (handle) + ocfs2_commit_trans(handle); + + if (new_inode) + sync_mapping_buffers(old_inode->i_mapping); + + if (new_inode) + iput(new_inode); + if (newfe_bh) + brelse(newfe_bh); + if (old_dir_bh) + brelse(old_dir_bh); + if (new_dir_bh) + brelse(new_dir_bh); + if (new_de_bh) + brelse(new_de_bh); + if (old_de_bh) + brelse(old_de_bh); + if (old_inode_de_bh) + brelse(old_inode_de_bh); + if (orphan_entry_bh) + brelse(orphan_entry_bh); + if (insert_entry_bh) + brelse(insert_entry_bh); + + mlog_exit(status); + + return status; +} + +/* + * we expect i_size = strlen(symname). Copy symname into the file + * data, including the null terminator. + */ +static int ocfs2_create_symlink_data(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + const char *symname) +{ + struct buffer_head **bhs = NULL; + const char *c; + struct super_block *sb = osb->sb; + u64 p_blkno; + int p_blocks; + int virtual, blocks, status, i, bytes_left; + + bytes_left = i_size_read(inode) + 1; + /* we can't trust i_blocks because we're actually going to + * write i_size + 1 bytes. */ + blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits; + + mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n", + inode->i_blocks, i_size_read(inode), blocks); + + /* Sanity check -- make sure we're going to fit. */ + if (bytes_left > + ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) { + status = -EIO; + mlog_errno(status); + goto bail; + } + + bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL); + if (!bhs) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno, + &p_blocks); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* links can never be larger than one cluster so we know this + * is all going to be contiguous, but do a sanity check + * anyway. */ + if ((p_blocks << sb->s_blocksize_bits) < bytes_left) { + status = -EIO; + mlog_errno(status); + goto bail; + } + + virtual = 0; + while(bytes_left > 0) { + c = &symname[virtual * sb->s_blocksize]; + + bhs[virtual] = sb_getblk(sb, p_blkno); + if (!bhs[virtual]) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]); + + status = ocfs2_journal_access(handle, inode, bhs[virtual], + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + memset(bhs[virtual]->b_data, 0, sb->s_blocksize); + + memcpy(bhs[virtual]->b_data, c, + (bytes_left > sb->s_blocksize) ? sb->s_blocksize : + bytes_left); + + status = ocfs2_journal_dirty(handle, bhs[virtual]); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + virtual++; + p_blkno++; + bytes_left -= sb->s_blocksize; + } + + status = 0; +bail: + + if (bhs) { + for(i = 0; i < blocks; i++) + if (bhs[i]) + brelse(bhs[i]); + kfree(bhs); + } + + mlog_exit(status); + return status; +} + +static int ocfs2_symlink(struct inode *dir, + struct dentry *dentry, + const char *symname) +{ + int status, l, credits; + u64 newsize; + struct ocfs2_super *osb = NULL; + struct inode *inode = NULL; + struct super_block *sb; + struct buffer_head *new_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct buffer_head *parent_fe_bh = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_dinode *dirfe; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_alloc_context *inode_ac = NULL; + struct ocfs2_alloc_context *data_ac = NULL; + + mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir, + dentry, symname, dentry->d_name.len, dentry->d_name.name); + + sb = dir->i_sb; + osb = OCFS2_SB(sb); + + l = strlen(symname) + 1; + + credits = ocfs2_calc_symlink_credits(sb); + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* lock the parent directory */ + status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + if (!dirfe->i_links_count) { + /* can't make a file in a deleted directory. */ + status = -ENOENT; + goto bail; + } + + status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (status) + goto bail; + + status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_reserve_new_inode(osb, handle, &inode_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + /* don't reserve bitmap space for fast symlinks. */ + if (l > ocfs2_fast_symlink_chars(sb)) { + status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + } + + handle = ocfs2_start_trans(osb, handle, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_mknod_locked(osb, dir, dentry, + S_IFLNK | S_IRWXUGO, 0, + &new_fe_bh, parent_fe_bh, handle, + &inode, inode_ac); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + fe = (struct ocfs2_dinode *) new_fe_bh->b_data; + inode->i_rdev = 0; + newsize = l - 1; + if (l > ocfs2_fast_symlink_chars(sb)) { + inode->i_op = &ocfs2_symlink_inode_operations; + status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh, + handle, data_ac, NULL, + NULL); + if (status < 0) { + if (status != -ENOSPC && status != -EINTR) { + mlog(ML_ERROR, "Failed to extend file to " + "%"MLFu64"\n", + newsize); + mlog_errno(status); + status = -ENOSPC; + } + goto bail; + } + i_size_write(inode, newsize); + inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize); + } else { + inode->i_op = &ocfs2_fast_symlink_inode_operations; + memcpy((char *) fe->id2.i_symlink, symname, l); + i_size_write(inode, newsize); + inode->i_blocks = 0; + } + + status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (!ocfs2_inode_is_fast_symlink(inode)) { + status = ocfs2_create_symlink_data(osb, handle, inode, + symname); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_add_entry(handle, dentry, inode, + le64_to_cpu(fe->i_blkno), parent_fe_bh, + de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + insert_inode_hash(inode); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); +bail: + if (handle) + ocfs2_commit_trans(handle); + if (new_fe_bh) + brelse(new_fe_bh); + if (parent_fe_bh) + brelse(parent_fe_bh); + if (de_bh) + brelse(de_bh); + if (inode_ac) + ocfs2_free_alloc_context(inode_ac); + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if ((status < 0) && inode) + iput(inode); + + mlog_exit(status); + + return status; +} + +int ocfs2_check_dir_entry(struct inode * dir, + struct ocfs2_dir_entry * de, + struct buffer_head * bh, + unsigned long offset) +{ + const char *error_msg = NULL; + const int rlen = le16_to_cpu(de->rec_len); + + if (rlen < OCFS2_DIR_REC_LEN(1)) + error_msg = "rec_len is smaller than minimal"; + else if (rlen % 4 != 0) + error_msg = "rec_len % 4 != 0"; + else if (rlen < OCFS2_DIR_REC_LEN(de->name_len)) + error_msg = "rec_len is too small for name_len"; + else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) + error_msg = "directory entry across blocks"; + + if (error_msg != NULL) + mlog(ML_ERROR, "bad entry in directory #%"MLFu64": %s - " + "offset=%lu, inode=%"MLFu64", rec_len=%d, name_len=%d\n", + OCFS2_I(dir)->ip_blkno, error_msg, offset, + le64_to_cpu(de->inode), rlen, de->name_len); + return error_msg == NULL ? 1 : 0; +} + +/* we don't always have a dentry for what we want to add, so people + * like orphan dir can call this instead. + * + * If you pass me insert_bh, I'll skip the search of the other dir + * blocks and put the record in there. + */ +static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + const char *name, int namelen, + struct inode *inode, u64 blkno, + struct buffer_head *parent_fe_bh, + struct buffer_head *insert_bh) +{ + unsigned long offset; + unsigned short rec_len; + struct ocfs2_dir_entry *de, *de1; + struct super_block *sb; + int retval, status; + + mlog_entry_void(); + + sb = dir->i_sb; + + if (!namelen) + return -EINVAL; + + rec_len = OCFS2_DIR_REC_LEN(namelen); + offset = 0; + de = (struct ocfs2_dir_entry *) insert_bh->b_data; + while (1) { + BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data); + /* These checks should've already been passed by the + * prepare function, but I guess we can leave them + * here anyway. */ + if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { + retval = -ENOENT; + goto bail; + } + if (ocfs2_match(namelen, name, de)) { + retval = -EEXIST; + goto bail; + } + if (((le64_to_cpu(de->inode) == 0) && + (le16_to_cpu(de->rec_len) >= rec_len)) || + (le16_to_cpu(de->rec_len) >= + (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { + status = ocfs2_journal_access(handle, dir, insert_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + /* By now the buffer is marked for journaling */ + offset += le16_to_cpu(de->rec_len); + if (le64_to_cpu(de->inode)) { + de1 = (struct ocfs2_dir_entry *)((char *) de + + OCFS2_DIR_REC_LEN(de->name_len)); + de1->rec_len = + cpu_to_le16(le16_to_cpu(de->rec_len) - + OCFS2_DIR_REC_LEN(de->name_len)); + de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); + de = de1; + } + de->file_type = OCFS2_FT_UNKNOWN; + if (blkno) { + de->inode = cpu_to_le64(blkno); + ocfs2_set_de_type(de, inode->i_mode); + } else + de->inode = 0; + de->name_len = namelen; + memcpy(de->name, name, namelen); + + dir->i_mtime = dir->i_ctime = CURRENT_TIME; + dir->i_version++; + status = ocfs2_journal_dirty(handle, insert_bh); + retval = 0; + goto bail; + } + offset += le16_to_cpu(de->rec_len); + de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); + } + + /* when you think about it, the assert above should prevent us + * from ever getting here. */ + retval = -ENOSPC; +bail: + + mlog_exit(retval); + return retval; +} + + +/* + * ocfs2_delete_entry deletes a directory entry by merging it with the + * previous entry + */ +static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + struct ocfs2_dir_entry *de_del, + struct buffer_head *bh) +{ + struct ocfs2_dir_entry *de, *pde; + int i, status = -ENOENT; + + mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh); + + i = 0; + pde = NULL; + de = (struct ocfs2_dir_entry *) bh->b_data; + while (i < bh->b_size) { + if (!ocfs2_check_dir_entry(dir, de, bh, i)) { + status = -EIO; + mlog_errno(status); + goto bail; + } + if (de == de_del) { + status = ocfs2_journal_access(handle, dir, bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + status = -EIO; + mlog_errno(status); + goto bail; + } + if (pde) + pde->rec_len = + cpu_to_le16(le16_to_cpu(pde->rec_len) + + le16_to_cpu(de->rec_len)); + else + de->inode = 0; + dir->i_version++; + status = ocfs2_journal_dirty(handle, bh); + goto bail; + } + i += le16_to_cpu(de->rec_len); + pde = de; + de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); + } +bail: + mlog_exit(status); + return status; +} + +/* + * Returns 0 if not found, -1 on failure, and 1 on success + */ +static int inline ocfs2_search_dirblock(struct buffer_head *bh, + struct inode *dir, + const char *name, int namelen, + unsigned long offset, + struct ocfs2_dir_entry **res_dir) +{ + struct ocfs2_dir_entry *de; + char *dlimit, *de_buf; + int de_len; + int ret = 0; + + mlog_entry_void(); + + de_buf = bh->b_data; + dlimit = de_buf + dir->i_sb->s_blocksize; + + while (de_buf < dlimit) { + /* this code is executed quadratically often */ + /* do minimal checking `by hand' */ + + de = (struct ocfs2_dir_entry *) de_buf; + + if (de_buf + namelen <= dlimit && + ocfs2_match(namelen, name, de)) { + /* found a match - just to be sure, do a full check */ + if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { + ret = -1; + goto bail; + } + *res_dir = de; + ret = 1; + goto bail; + } + + /* prevent looping on a bad block */ + de_len = le16_to_cpu(de->rec_len); + if (de_len <= 0) { + ret = -1; + goto bail; + } + + de_buf += de_len; + offset += de_len; + } + +bail: + mlog_exit(ret); + return ret; +} + +struct buffer_head *ocfs2_find_entry(const char *name, int namelen, + struct inode *dir, + struct ocfs2_dir_entry **res_dir) +{ + struct super_block *sb; + struct buffer_head *bh_use[NAMEI_RA_SIZE]; + struct buffer_head *bh, *ret = NULL; + unsigned long start, block, b; + int ra_max = 0; /* Number of bh's in the readahead + buffer, bh_use[] */ + int ra_ptr = 0; /* Current index into readahead + buffer */ + int num = 0; + int nblocks, i, err; + + mlog_entry_void(); + + *res_dir = NULL; + sb = dir->i_sb; + + nblocks = i_size_read(dir) >> sb->s_blocksize_bits; + start = OCFS2_I(dir)->ip_dir_start_lookup; + if (start >= nblocks) + start = 0; + block = start; + +restart: + do { + /* + * We deal with the read-ahead logic here. + */ + if (ra_ptr >= ra_max) { + /* Refill the readahead buffer */ + ra_ptr = 0; + b = block; + for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { + /* + * Terminate if we reach the end of the + * directory and must wrap, or if our + * search has finished at this block. + */ + if (b >= nblocks || (num && block == start)) { + bh_use[ra_max] = NULL; + break; + } + num++; + + /* XXX: questionable readahead stuff here */ + bh = ocfs2_bread(dir, b++, &err, 1); + bh_use[ra_max] = bh; +#if 0 // ??? + if (bh) + ll_rw_block(READ, 1, &bh); +#endif + } + } + if ((bh = bh_use[ra_ptr++]) == NULL) + goto next; + wait_on_buffer(bh); + if (!buffer_uptodate(bh)) { + /* read error, skip block & hope for the best */ + brelse(bh); + goto next; + } + i = ocfs2_search_dirblock(bh, dir, name, namelen, + block << sb->s_blocksize_bits, + res_dir); + if (i == 1) { + OCFS2_I(dir)->ip_dir_start_lookup = block; + ret = bh; + goto cleanup_and_exit; + } else { + brelse(bh); + if (i < 0) + goto cleanup_and_exit; + } + next: + if (++block >= nblocks) + block = 0; + } while (block != start); + + /* + * If the directory has grown while we were searching, then + * search the last part of the directory before giving up. + */ + block = nblocks; + nblocks = i_size_read(dir) >> sb->s_blocksize_bits; + if (block < nblocks) { + start = 0; + goto restart; + } + +cleanup_and_exit: + /* Clean up the read-ahead blocks */ + for (; ra_ptr < ra_max; ra_ptr++) + brelse(bh_use[ra_ptr]); + + mlog_exit_ptr(ret); + return ret; +} + +static int ocfs2_blkno_stringify(u64 blkno, char *name) +{ + int status, namelen; + + mlog_entry_void(); + + namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016"MLFx64, + blkno); + if (namelen <= 0) { + if (namelen) + status = namelen; + else + status = -EINVAL; + mlog_errno(status); + goto bail; + } + if (namelen != OCFS2_ORPHAN_NAMELEN) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name, + namelen); + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + char *name, + struct buffer_head **de_bh) +{ + struct inode *orphan_dir_inode = NULL; + struct buffer_head *orphan_dir_bh = NULL; + int status = 0; + + status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + osb->slot_num); + if (!orphan_dir_inode) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + ocfs2_handle_add_inode(handle, orphan_dir_inode); + status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode, + orphan_dir_bh, name, + OCFS2_ORPHAN_NAMELEN, de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + +leave: + if (orphan_dir_inode) + iput(orphan_dir_inode); + + if (orphan_dir_bh) + brelse(orphan_dir_bh); + + mlog_exit(status); + return status; +} + +static int ocfs2_orphan_add(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct ocfs2_dinode *fe, + char *name, + struct buffer_head *de_bh) +{ + struct inode *orphan_dir_inode = NULL; + struct buffer_head *orphan_dir_bh = NULL; + int status = 0; + struct ocfs2_dinode *orphan_fe; + + mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino); + + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + osb->slot_num); + if (!orphan_dir_inode) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + status = ocfs2_read_block(osb, + OCFS2_I(orphan_dir_inode)->ip_blkno, + &orphan_dir_bh, OCFS2_BH_CACHED, + orphan_dir_inode); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* we're a cluster, and nlink can change on disk from + * underneath us... */ + orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; + if (S_ISDIR(inode->i_mode)) + le16_add_cpu(&orphan_fe->i_links_count, 1); + orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); + + status = ocfs2_journal_dirty(handle, orphan_dir_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = __ocfs2_add_entry(handle, orphan_dir_inode, name, + OCFS2_ORPHAN_NAMELEN, inode, + OCFS2_I(inode)->ip_blkno, + orphan_dir_bh, de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL); + + /* Record which orphan dir our inode now resides + * in. delete_inode will use this to determine which orphan + * dir to lock. */ + spin_lock(&OCFS2_I(inode)->ip_lock); + OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num; + spin_unlock(&OCFS2_I(inode)->ip_lock); + + mlog(0, "Inode %"MLFu64" orphaned in slot %d\n", + OCFS2_I(inode)->ip_blkno, osb->slot_num); + +leave: + if (orphan_dir_inode) + iput(orphan_dir_inode); + + if (orphan_dir_bh) + brelse(orphan_dir_bh); + + mlog_exit(status); + return status; +} + +/* unlike orphan_add, we expect the orphan dir to already be locked here. */ +int ocfs2_orphan_del(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *orphan_dir_inode, + struct inode *inode, + struct buffer_head *orphan_dir_bh) +{ + char name[OCFS2_ORPHAN_NAMELEN + 1]; + struct ocfs2_dinode *orphan_fe; + int status = 0; + struct buffer_head *target_de_bh = NULL; + struct ocfs2_dir_entry *target_de = NULL; + + mlog_entry_void(); + + status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + mlog(0, "removing '%s' from orphan dir %"MLFu64" (namelen=%d)\n", + name, OCFS2_I(orphan_dir_inode)->ip_blkno, OCFS2_ORPHAN_NAMELEN); + + /* find it's spot in the orphan directory */ + target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, + orphan_dir_inode, &target_de); + if (!target_de_bh) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + /* remove it from the orphan directory */ + status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de, + target_de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* do the i_nlink dance! :) */ + orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; + if (S_ISDIR(inode->i_mode)) + le16_add_cpu(&orphan_fe->i_links_count, -1); + orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); + + status = ocfs2_journal_dirty(handle, orphan_dir_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + +leave: + if (target_de_bh) + brelse(target_de_bh); + + mlog_exit(status); + return status; +} + +struct inode_operations ocfs2_dir_iops = { + .create = ocfs2_create, + .lookup = ocfs2_lookup, + .link = ocfs2_link, + .unlink = ocfs2_unlink, + .rmdir = ocfs2_unlink, + .symlink = ocfs2_symlink, + .mkdir = ocfs2_mkdir, + .mknod = ocfs2_mknod, + .rename = ocfs2_rename, + .setattr = ocfs2_setattr, + .getattr = ocfs2_getattr, +}; diff --git a/fs/ocfs2/namei.h b/fs/ocfs2/namei.h new file mode 100644 index 0000000..deaaa97 --- /dev/null +++ b/fs/ocfs2/namei.h @@ -0,0 +1,58 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * namei.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_NAMEI_H +#define OCFS2_NAMEI_H + +extern struct inode_operations ocfs2_dir_iops; + +struct dentry *ocfs2_get_parent(struct dentry *child); + +int ocfs2_check_dir_entry (struct inode *dir, + struct ocfs2_dir_entry *de, + struct buffer_head *bh, + unsigned long offset); +struct buffer_head *ocfs2_find_entry(const char *name, + int namelen, + struct inode *dir, + struct ocfs2_dir_entry **res_dir); +int ocfs2_orphan_del(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *orphan_dir_inode, + struct inode *inode, + struct buffer_head *orphan_dir_bh); + +static inline int ocfs2_match(int len, + const char * const name, + struct ocfs2_dir_entry *de) +{ + if (len != de->name_len) + return 0; + if (!de->inode) + return 0; + return !memcmp(name, de->name, len); +} + +#endif /* OCFS2_NAMEI_H */ diff --git a/fs/ocfs2/ocfs1_fs_compat.h b/fs/ocfs2/ocfs1_fs_compat.h new file mode 100644 index 0000000..0b499bc --- /dev/null +++ b/fs/ocfs2/ocfs1_fs_compat.h @@ -0,0 +1,109 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs1_fs_compat.h + * + * OCFS1 volume header definitions. OCFS2 creates valid but unmountable + * OCFS1 volume headers on the first two sectors of an OCFS2 volume. + * This allows an OCFS1 volume to see the partition and cleanly fail to + * mount it. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _OCFS1_FS_COMPAT_H +#define _OCFS1_FS_COMPAT_H + +#define OCFS1_MAX_VOL_SIGNATURE_LEN 128 +#define OCFS1_MAX_MOUNT_POINT_LEN 128 +#define OCFS1_MAX_VOL_ID_LENGTH 16 +#define OCFS1_MAX_VOL_LABEL_LEN 64 +#define OCFS1_MAX_CLUSTER_NAME_LEN 64 + +#define OCFS1_MAJOR_VERSION (2) +#define OCFS1_MINOR_VERSION (0) +#define OCFS1_VOLUME_SIGNATURE "OracleCFS" + +/* + * OCFS1 superblock. Lives at sector 0. + */ +struct ocfs1_vol_disk_hdr +{ +/*00*/ __u32 minor_version; + __u32 major_version; +/*08*/ __u8 signature[OCFS1_MAX_VOL_SIGNATURE_LEN]; +/*88*/ __u8 mount_point[OCFS1_MAX_MOUNT_POINT_LEN]; +/*108*/ __u64 serial_num; +/*110*/ __u64 device_size; + __u64 start_off; +/*120*/ __u64 bitmap_off; + __u64 publ_off; +/*130*/ __u64 vote_off; + __u64 root_bitmap_off; +/*140*/ __u64 data_start_off; + __u64 root_bitmap_size; +/*150*/ __u64 root_off; + __u64 root_size; +/*160*/ __u64 cluster_size; + __u64 num_nodes; +/*170*/ __u64 num_clusters; + __u64 dir_node_size; +/*180*/ __u64 file_node_size; + __u64 internal_off; +/*190*/ __u64 node_cfg_off; + __u64 node_cfg_size; +/*1A0*/ __u64 new_cfg_off; + __u32 prot_bits; + __s32 excl_mount; +/*1B0*/ +}; + + +struct ocfs1_disk_lock +{ +/*00*/ __u32 curr_master; + __u8 file_lock; + __u8 compat_pad[3]; /* Not in orignal definition. Used to + make the already existing alignment + explicit */ + __u64 last_write_time; +/*10*/ __u64 last_read_time; + __u32 writer_node_num; + __u32 reader_node_num; +/*20*/ __u64 oin_node_map; + __u64 dlock_seq_num; +/*30*/ +}; + +/* + * OCFS1 volume label. Lives at sector 1. + */ +struct ocfs1_vol_label +{ +/*00*/ struct ocfs1_disk_lock disk_lock; +/*30*/ __u8 label[OCFS1_MAX_VOL_LABEL_LEN]; +/*70*/ __u16 label_len; +/*72*/ __u8 vol_id[OCFS1_MAX_VOL_ID_LENGTH]; +/*82*/ __u16 vol_id_len; +/*84*/ __u8 cluster_name[OCFS1_MAX_CLUSTER_NAME_LEN]; +/*A4*/ __u16 cluster_name_len; +/*A6*/ +}; + + +#endif /* _OCFS1_FS_COMPAT_H */ + diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h new file mode 100644 index 0000000..f468c60 --- /dev/null +++ b/fs/ocfs2/ocfs2.h @@ -0,0 +1,464 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2.h + * + * Defines macros and structures used in OCFS2 + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_H +#define OCFS2_H + +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/list.h> +#include <linux/rbtree.h> +#include <linux/workqueue.h> +#include <linux/kref.h> + +#include "cluster/nodemanager.h" +#include "cluster/heartbeat.h" +#include "cluster/tcp.h" + +#include "dlm/dlmapi.h" + +#include "ocfs2_fs.h" +#include "endian.h" +#include "ocfs2_lockid.h" + +struct ocfs2_extent_map { + u32 em_clusters; + struct rb_root em_extents; +}; + +/* Most user visible OCFS2 inodes will have very few pieces of + * metadata, but larger files (including bitmaps, etc) must be taken + * into account when designing an access scheme. We allow a small + * amount of inlined blocks to be stored on an array and grow the + * structure into a rb tree when necessary. */ +#define OCFS2_INODE_MAX_CACHE_ARRAY 2 + +struct ocfs2_caching_info { + unsigned int ci_num_cached; + union { + sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY]; + struct rb_root ci_tree; + } ci_cache; +}; + +/* this limits us to 256 nodes + * if we need more, we can do a kmalloc for the map */ +#define OCFS2_NODE_MAP_MAX_NODES 256 +struct ocfs2_node_map { + u16 num_nodes; + unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; +}; + +enum ocfs2_ast_action { + OCFS2_AST_INVALID = 0, + OCFS2_AST_ATTACH, + OCFS2_AST_CONVERT, + OCFS2_AST_DOWNCONVERT, +}; + +/* actions for an unlockast function to take. */ +enum ocfs2_unlock_action { + OCFS2_UNLOCK_INVALID = 0, + OCFS2_UNLOCK_CANCEL_CONVERT, + OCFS2_UNLOCK_DROP_LOCK, +}; + +/* ocfs2_lock_res->l_flags flags. */ +#define OCFS2_LOCK_ATTACHED (0x00000001) /* have we initialized + * the lvb */ +#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in + * dlm_lock */ +#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to + * downconvert*/ +#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ +#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) +#define OCFS2_LOCK_REFRESHING (0x00000020) +#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization + * for shutdown paths */ +#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track + * when to skip queueing + * a lock because it's + * about to be + * dropped. */ +#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ + +struct ocfs2_lock_res_ops; + +typedef void (*ocfs2_lock_callback)(int status, unsigned long data); + +struct ocfs2_lock_res { + void *l_priv; + struct ocfs2_lock_res_ops *l_ops; + spinlock_t l_lock; + + struct list_head l_blocked_list; + struct list_head l_mask_waiters; + + enum ocfs2_lock_type l_type; + unsigned long l_flags; + char l_name[OCFS2_LOCK_ID_MAX_LEN]; + int l_level; + unsigned int l_ro_holders; + unsigned int l_ex_holders; + struct dlm_lockstatus l_lksb; + + /* used from AST/BAST funcs. */ + enum ocfs2_ast_action l_action; + enum ocfs2_unlock_action l_unlock_action; + int l_requested; + int l_blocking; + + wait_queue_head_t l_event; + + struct list_head l_debug_list; +}; + +struct ocfs2_dlm_debug { + struct kref d_refcnt; + struct dentry *d_locking_state; + struct list_head d_lockres_tracking; +}; + +enum ocfs2_vol_state +{ + VOLUME_INIT = 0, + VOLUME_MOUNTED, + VOLUME_DISMOUNTED, + VOLUME_DISABLED +}; + +struct ocfs2_alloc_stats +{ + atomic_t moves; + atomic_t local_data; + atomic_t bitmap_data; + atomic_t bg_allocs; + atomic_t bg_extends; +}; + +enum ocfs2_local_alloc_state +{ + OCFS2_LA_UNUSED = 0, + OCFS2_LA_ENABLED, + OCFS2_LA_DISABLED +}; + +enum ocfs2_mount_options +{ + OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ + OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ + OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ + OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ + OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ +#ifdef OCFS2_ORACORE_WORKAROUNDS + OCFS2_MOUNT_COMPAT_OCFS = 1 << 30, /* ocfs1 compatibility mode */ +#endif +}; + +#define OCFS2_OSB_SOFT_RO 0x0001 +#define OCFS2_OSB_HARD_RO 0x0002 +#define OCFS2_OSB_ERROR_FS 0x0004 + +struct ocfs2_journal; +struct ocfs2_journal_handle; +struct ocfs2_super +{ + u32 osb_id; /* id used by the proc interface */ + struct task_struct *commit_task; + struct super_block *sb; + struct inode *root_inode; + struct inode *sys_root_inode; + struct inode *system_inodes[NUM_SYSTEM_INODES]; + + struct ocfs2_slot_info *slot_info; + + spinlock_t node_map_lock; + struct ocfs2_node_map mounted_map; + struct ocfs2_node_map recovery_map; + struct ocfs2_node_map umount_map; + + u32 num_clusters; + u64 root_blkno; + u64 system_dir_blkno; + u64 bitmap_blkno; + u32 bitmap_cpg; + u8 *uuid; + char *uuid_str; + u8 *vol_label; + u64 first_cluster_group_blkno; + u32 fs_generation; + + u32 s_feature_compat; + u32 s_feature_incompat; + u32 s_feature_ro_compat; + + /* Protects s_next_generaion, osb_flags. Could protect more on + * osb as it's very short lived. */ + spinlock_t osb_lock; + u32 s_next_generation; + unsigned long osb_flags; + + unsigned long s_mount_opt; + + u16 max_slots; + u16 num_nodes; + s16 node_num; + s16 slot_num; + int s_sectsize_bits; + int s_clustersize; + int s_clustersize_bits; + struct proc_dir_entry *proc_sub_dir; /* points to /proc/fs/ocfs2/<maj_min> */ + + atomic_t vol_state; + struct semaphore recovery_lock; + struct task_struct *recovery_thread_task; + int disable_recovery; + wait_queue_head_t checkpoint_event; + atomic_t needs_checkpoint; + struct ocfs2_journal *journal; + + enum ocfs2_local_alloc_state local_alloc_state; + struct buffer_head *local_alloc_bh; + + /* Next two fields are for local node slot recovery during + * mount. */ + int dirty; + struct ocfs2_dinode *local_alloc_copy; + + struct ocfs2_alloc_stats alloc_stats; + char dev_str[20]; /* "major,minor" of the device */ + + struct dlm_ctxt *dlm; + struct ocfs2_lock_res osb_super_lockres; + struct ocfs2_lock_res osb_rename_lockres; + struct dlm_eviction_cb osb_eviction_cb; + struct ocfs2_dlm_debug *osb_dlm_debug; + + struct dentry *osb_debug_root; + + wait_queue_head_t recovery_event; + + spinlock_t vote_task_lock; + struct task_struct *vote_task; + wait_queue_head_t vote_event; + unsigned long vote_wake_sequence; + unsigned long vote_work_sequence; + + struct list_head blocked_lock_list; + unsigned long blocked_lock_count; + + struct list_head vote_list; + int vote_count; + + u32 net_key; + spinlock_t net_response_lock; + unsigned int net_response_ids; + struct list_head net_response_list; + + struct o2hb_callback_func osb_hb_up; + struct o2hb_callback_func osb_hb_down; + + struct list_head osb_net_handlers; + + wait_queue_head_t osb_mount_event; + + /* Truncate log info */ + struct inode *osb_tl_inode; + struct buffer_head *osb_tl_bh; + struct work_struct osb_truncate_log_wq; +}; + +#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) +#define OCFS2_MAX_OSB_ID 65536 + +static inline int ocfs2_should_order_data(struct inode *inode) +{ + if (!S_ISREG(inode->i_mode)) + return 0; + if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) + return 0; + return 1; +} + +/* set / clear functions because cluster events can make these happen + * in parallel so we want the transitions to be atomic. this also + * means that any future flags osb_flags must be protected by spinlock + * too! */ +static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, + unsigned long flag) +{ + spin_lock(&osb->osb_lock); + osb->osb_flags |= flag; + spin_unlock(&osb->osb_lock); +} + +static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, + int hard) +{ + spin_lock(&osb->osb_lock); + osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); + if (hard) + osb->osb_flags |= OCFS2_OSB_HARD_RO; + else + osb->osb_flags |= OCFS2_OSB_SOFT_RO; + spin_unlock(&osb->osb_lock); +} + +static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) +{ + int ret; + + spin_lock(&osb->osb_lock); + ret = osb->osb_flags & OCFS2_OSB_HARD_RO; + spin_unlock(&osb->osb_lock); + + return ret; +} + +static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) +{ + int ret; + + spin_lock(&osb->osb_lock); + ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; + spin_unlock(&osb->osb_lock); + + return ret; +} + +#define OCFS2_IS_VALID_DINODE(ptr) \ + (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) + +#define OCFS2_RO_ON_INVALID_DINODE(__sb, __di) do { \ + typeof(__di) ____di = (__di); \ + ocfs2_error((__sb), \ + "Dinode # %"MLFu64" has bad signature %.*s", \ + (____di)->i_blkno, 7, \ + (____di)->i_signature); \ +} while (0); + +#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ + (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) + +#define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb) do { \ + typeof(__eb) ____eb = (__eb); \ + ocfs2_error((__sb), \ + "Extent Block # %"MLFu64" has bad signature %.*s", \ + (____eb)->h_blkno, 7, \ + (____eb)->h_signature); \ +} while (0); + +#define OCFS2_IS_VALID_GROUP_DESC(ptr) \ + (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) + +#define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd) do { \ + typeof(__gd) ____gd = (__gd); \ + ocfs2_error((__sb), \ + "Group Descriptor # %"MLFu64" has bad signature %.*s", \ + (____gd)->bg_blkno, 7, \ + (____gd)->bg_signature); \ +} while (0); + +static inline unsigned long ino_from_blkno(struct super_block *sb, + u64 blkno) +{ + return (unsigned long)(blkno & (u64)ULONG_MAX); +} + +static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, + u32 clusters) +{ + int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - + sb->s_blocksize_bits; + + return (u64)clusters << c_to_b_bits; +} + +static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, + u64 blocks) +{ + int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - + sb->s_blocksize_bits; + + return (u32)(blocks >> b_to_c_bits); +} + +static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, + u64 bytes) +{ + int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int clusters; + + bytes += OCFS2_SB(sb)->s_clustersize - 1; + /* OCFS2 just cannot have enough clusters to overflow this */ + clusters = (unsigned int)(bytes >> cl_bits); + + return clusters; +} + +static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, + u64 bytes) +{ + bytes += sb->s_blocksize - 1; + return bytes >> sb->s_blocksize_bits; +} + +static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, + u32 clusters) +{ + return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; +} + +static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, + u64 bytes) +{ + int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int clusters; + + clusters = ocfs2_clusters_for_bytes(sb, bytes); + return (u64)clusters << cl_bits; +} + +static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, + u64 bytes) +{ + u64 blocks; + + blocks = ocfs2_blocks_for_bytes(sb, bytes); + return blocks << sb->s_blocksize_bits; +} + +static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) +{ + return (unsigned long)((bytes + 511) >> 9); +} + +#define ocfs2_set_bit ext2_set_bit +#define ocfs2_clear_bit ext2_clear_bit +#define ocfs2_test_bit ext2_test_bit +#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit +#endif /* OCFS2_H */ + diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h new file mode 100644 index 0000000..dfb8a5b --- /dev/null +++ b/fs/ocfs2/ocfs2_fs.h @@ -0,0 +1,638 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2_fs.h + * + * On-disk structures for OCFS2. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _OCFS2_FS_H +#define _OCFS2_FS_H + +/* Version */ +#define OCFS2_MAJOR_REV_LEVEL 0 +#define OCFS2_MINOR_REV_LEVEL 90 + +/* + * An OCFS2 volume starts this way: + * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS. + * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS. + * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock. + * + * All other structures are found from the superblock information. + * + * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a + * blocksize of 2K, it is 4096 bytes into disk. + */ +#define OCFS2_SUPER_BLOCK_BLKNO 2 + +/* + * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could + * grow if needed. + */ +#define OCFS2_MIN_CLUSTERSIZE 4096 +#define OCFS2_MAX_CLUSTERSIZE 1048576 + +/* + * Blocks cannot be bigger than clusters, so the maximum blocksize is the + * minimum cluster size. + */ +#define OCFS2_MIN_BLOCKSIZE 512 +#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE + +/* Filesystem magic number */ +#define OCFS2_SUPER_MAGIC 0x7461636f + +/* Object signatures */ +#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2" +#define OCFS2_INODE_SIGNATURE "INODE01" +#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01" +#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01" + +/* Compatibility flags */ +#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ + ( OCFS2_SB(sb)->s_feature_compat & (mask) ) +#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ + ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) +#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ + ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) +#define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_compat |= (mask) +#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_ro_compat |= (mask) +#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_incompat |= (mask) +#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_compat &= ~(mask) +#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) +#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ + OCFS2_SB(sb)->s_feature_incompat &= ~(mask) + +#define OCFS2_FEATURE_COMPAT_SUPP 0 +#define OCFS2_FEATURE_INCOMPAT_SUPP 0 +#define OCFS2_FEATURE_RO_COMPAT_SUPP 0 + +/* + * Heartbeat-only devices are missing journals and other files. The + * filesystem driver can't load them, but the library can. Never put + * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. + */ +#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 + + +/* + * Flags on ocfs2_dinode.i_flags + */ +#define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ +#define OCFS2_UNUSED2_FL (0x00000002) +#define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ +#define OCFS2_UNUSED3_FL (0x00000008) +/* System inode flags */ +#define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ +#define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ +#define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ +#define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ +#define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ +#define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ +#define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ +#define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ + +/* + * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) + */ +#define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ + +/* + * superblock s_state flags + */ +#define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ + +/* Limit of space in ocfs2_dir_entry */ +#define OCFS2_MAX_FILENAME_LEN 255 + +/* Maximum slots on an ocfs2 file system */ +#define OCFS2_MAX_SLOTS 255 + +/* Slot map indicator for an empty slot */ +#define OCFS2_INVALID_SLOT -1 + +#define OCFS2_VOL_UUID_LEN 16 +#define OCFS2_MAX_VOL_LABEL_LEN 64 + +/* Journal limits (in bytes) */ +#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) +#define OCFS2_MAX_JOURNAL_SIZE (500 * 1024 * 1024) + +struct ocfs2_system_inode_info { + char *si_name; + int si_iflags; + int si_mode; +}; + +/* System file index */ +enum { + BAD_BLOCK_SYSTEM_INODE = 0, + GLOBAL_INODE_ALLOC_SYSTEM_INODE, + SLOT_MAP_SYSTEM_INODE, +#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE + HEARTBEAT_SYSTEM_INODE, + GLOBAL_BITMAP_SYSTEM_INODE, +#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE + ORPHAN_DIR_SYSTEM_INODE, + EXTENT_ALLOC_SYSTEM_INODE, + INODE_ALLOC_SYSTEM_INODE, + JOURNAL_SYSTEM_INODE, + LOCAL_ALLOC_SYSTEM_INODE, + TRUNCATE_LOG_SYSTEM_INODE, + NUM_SYSTEM_INODES +}; + +static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { + /* Global system inodes (single copy) */ + /* The first two are only used from userspace mfks/tunefs */ + [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, + [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, + + /* These are used by the running filesystem */ + [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, + [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, + [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, + + /* Slot-specific system inodes (one copy per slot) */ + [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, + [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, + [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, + [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, + [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, + [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } +}; + +/* Parameter passed from mount.ocfs2 to module */ +#define OCFS2_HB_NONE "heartbeat=none" +#define OCFS2_HB_LOCAL "heartbeat=local" + +/* + * OCFS2 directory file types. Only the low 3 bits are used. The + * other bits are reserved for now. + */ +#define OCFS2_FT_UNKNOWN 0 +#define OCFS2_FT_REG_FILE 1 +#define OCFS2_FT_DIR 2 +#define OCFS2_FT_CHRDEV 3 +#define OCFS2_FT_BLKDEV 4 +#define OCFS2_FT_FIFO 5 +#define OCFS2_FT_SOCK 6 +#define OCFS2_FT_SYMLINK 7 + +#define OCFS2_FT_MAX 8 + +/* + * OCFS2_DIR_PAD defines the directory entries boundaries + * + * NOTE: It must be a multiple of 4 + */ +#define OCFS2_DIR_PAD 4 +#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) +#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) +#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ + OCFS2_DIR_ROUND) & \ + ~OCFS2_DIR_ROUND) + +#define OCFS2_LINK_MAX 32000 + +#define S_SHIFT 12 +static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { + [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, + [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, + [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, + [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, + [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, + [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, + [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, +}; + + +/* + * Convenience casts + */ +#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) + +/* + * On disk extent record for OCFS2 + * It describes a range of clusters on disk. + */ +struct ocfs2_extent_rec { +/*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ + __le32 e_clusters; /* Clusters covered by this extent */ + __le64 e_blkno; /* Physical disk offset, in blocks */ +/*10*/ +}; + +struct ocfs2_chain_rec { + __le32 c_free; /* Number of free bits in this chain. */ + __le32 c_total; /* Number of total bits in this chain */ + __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ +}; + +struct ocfs2_truncate_rec { + __le32 t_start; /* 1st cluster in this log */ + __le32 t_clusters; /* Number of total clusters covered */ +}; + +/* + * On disk extent list for OCFS2 (node in the tree). Note that this + * is contained inside ocfs2_dinode or ocfs2_extent_block, so the + * offsets are relative to ocfs2_dinode.id2.i_list or + * ocfs2_extent_block.h_list, respectively. + */ +struct ocfs2_extent_list { +/*00*/ __le16 l_tree_depth; /* Extent tree depth from this + point. 0 means data extents + hang directly off this + header (a leaf) */ + __le16 l_count; /* Number of extent records */ + __le16 l_next_free_rec; /* Next unused extent slot */ + __le16 l_reserved1; + __le64 l_reserved2; /* Pad to + sizeof(ocfs2_extent_rec) */ +/*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ +}; + +/* + * On disk allocation chain list for OCFS2. Note that this is + * contained inside ocfs2_dinode, so the offsets are relative to + * ocfs2_dinode.id2.i_chain. + */ +struct ocfs2_chain_list { +/*00*/ __le16 cl_cpg; /* Clusters per Block Group */ + __le16 cl_bpc; /* Bits per cluster */ + __le16 cl_count; /* Total chains in this list */ + __le16 cl_next_free_rec; /* Next unused chain slot */ + __le64 cl_reserved1; +/*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ +}; + +/* + * On disk deallocation log for OCFS2. Note that this is + * contained inside ocfs2_dinode, so the offsets are relative to + * ocfs2_dinode.id2.i_dealloc. + */ +struct ocfs2_truncate_log { +/*00*/ __le16 tl_count; /* Total records in this log */ + __le16 tl_used; /* Number of records in use */ + __le32 tl_reserved1; +/*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ +}; + +/* + * On disk extent block (indirect block) for OCFS2 + */ +struct ocfs2_extent_block +{ +/*00*/ __u8 h_signature[8]; /* Signature for verification */ + __le64 h_reserved1; +/*10*/ __le16 h_suballoc_slot; /* Slot suballocator this + extent_header belongs to */ + __le16 h_suballoc_bit; /* Bit offset in suballocator + block group */ + __le32 h_fs_generation; /* Must match super block */ + __le64 h_blkno; /* Offset on disk, in blocks */ +/*20*/ __le64 h_reserved3; + __le64 h_next_leaf_blk; /* Offset on disk, in blocks, + of next leaf header pointing + to data */ +/*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ +/* Actual on-disk size is one block */ +}; + +/* + * On disk superblock for OCFS2 + * Note that it is contained inside an ocfs2_dinode, so all offsets + * are relative to the start of ocfs2_dinode.id2. + */ +struct ocfs2_super_block { +/*00*/ __le16 s_major_rev_level; + __le16 s_minor_rev_level; + __le16 s_mnt_count; + __le16 s_max_mnt_count; + __le16 s_state; /* File system state */ + __le16 s_errors; /* Behaviour when detecting errors */ + __le32 s_checkinterval; /* Max time between checks */ +/*10*/ __le64 s_lastcheck; /* Time of last check */ + __le32 s_creator_os; /* OS */ + __le32 s_feature_compat; /* Compatible feature set */ +/*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ + __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ + __le64 s_root_blkno; /* Offset, in blocks, of root directory + dinode */ +/*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system + directory dinode */ + __le32 s_blocksize_bits; /* Blocksize for this fs */ + __le32 s_clustersize_bits; /* Clustersize for this fs */ +/*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts + before tunefs required */ + __le16 s_reserved1; + __le32 s_reserved2; + __le64 s_first_cluster_group; /* Block offset of 1st cluster + * group header */ +/*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ +/*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ +/*A0*/ +}; + +/* + * Local allocation bitmap for OCFS2 slots + * Note that it exists inside an ocfs2_dinode, so all offsets are + * relative to the start of ocfs2_dinode.id2. + */ +struct ocfs2_local_alloc +{ +/*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ + __le16 la_size; /* Size of included bitmap, in bytes */ + __le16 la_reserved1; + __le64 la_reserved2; +/*10*/ __u8 la_bitmap[0]; +}; + +/* + * On disk inode for OCFS2 + */ +struct ocfs2_dinode { +/*00*/ __u8 i_signature[8]; /* Signature for validation */ + __le32 i_generation; /* Generation number */ + __le16 i_suballoc_slot; /* Slot suballocator this inode + belongs to */ + __le16 i_suballoc_bit; /* Bit offset in suballocator + block group */ +/*10*/ __le32 i_reserved0; + __le32 i_clusters; /* Cluster count */ + __le32 i_uid; /* Owner UID */ + __le32 i_gid; /* Owning GID */ +/*20*/ __le64 i_size; /* Size in bytes */ + __le16 i_mode; /* File mode */ + __le16 i_links_count; /* Links count */ + __le32 i_flags; /* File flags */ +/*30*/ __le64 i_atime; /* Access time */ + __le64 i_ctime; /* Creation time */ +/*40*/ __le64 i_mtime; /* Modification time */ + __le64 i_dtime; /* Deletion time */ +/*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ + __le64 i_last_eb_blk; /* Pointer to last extent + block */ +/*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ + __le32 i_atime_nsec; + __le32 i_ctime_nsec; + __le32 i_mtime_nsec; +/*70*/ __le64 i_reserved1[9]; +/*B8*/ union { + __le64 i_pad1; /* Generic way to refer to this + 64bit union */ + struct { + __le64 i_rdev; /* Device number */ + } dev1; + struct { /* Info for bitmap system + inodes */ + __le32 i_used; /* Bits (ie, clusters) used */ + __le32 i_total; /* Total bits (clusters) + available */ + } bitmap1; + struct { /* Info for journal system + inodes */ + __le32 ij_flags; /* Mounted, version, etc. */ + __le32 ij_pad; + } journal1; + } id1; /* Inode type dependant 1 */ +/*C0*/ union { + struct ocfs2_super_block i_super; + struct ocfs2_local_alloc i_lab; + struct ocfs2_chain_list i_chain; + struct ocfs2_extent_list i_list; + struct ocfs2_truncate_log i_dealloc; + __u8 i_symlink[0]; + } id2; +/* Actual on-disk size is one block */ +}; + +/* + * On-disk directory entry structure for OCFS2 + * + * Packed as this structure could be accessed unaligned on 64-bit platforms + */ +struct ocfs2_dir_entry { +/*00*/ __le64 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __u8 name_len; /* Name length */ + __u8 file_type; +/*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ +/* Actual on-disk length specified by rec_len */ +} __attribute__ ((packed)); + +/* + * On disk allocator group structure for OCFS2 + */ +struct ocfs2_group_desc +{ +/*00*/ __u8 bg_signature[8]; /* Signature for validation */ + __le16 bg_size; /* Size of included bitmap in + bytes. */ + __le16 bg_bits; /* Bits represented by this + group. */ + __le16 bg_free_bits_count; /* Free bits count */ + __le16 bg_chain; /* What chain I am in. */ +/*10*/ __le32 bg_generation; + __le32 bg_reserved1; + __le64 bg_next_group; /* Next group in my list, in + blocks */ +/*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in + blocks */ + __le64 bg_blkno; /* Offset on disk, in blocks */ +/*30*/ __le64 bg_reserved2[2]; +/*40*/ __u8 bg_bitmap[0]; +}; + +#ifdef __KERNEL__ +static inline int ocfs2_fast_symlink_chars(struct super_block *sb) +{ + return sb->s_blocksize - + offsetof(struct ocfs2_dinode, id2.i_symlink); +} + +static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) +{ + int size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_dinode, id2.i_list.l_recs); + + return size / sizeof(struct ocfs2_extent_rec); +} + +static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) +{ + int size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); + + return size / sizeof(struct ocfs2_chain_rec); +} + +static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) +{ + int size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_extent_block, h_list.l_recs); + + return size / sizeof(struct ocfs2_extent_rec); +} + +static inline u16 ocfs2_local_alloc_size(struct super_block *sb) +{ + u16 size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); + + return size; +} + +static inline int ocfs2_group_bitmap_size(struct super_block *sb) +{ + int size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_group_desc, bg_bitmap); + + return size; +} + +static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) +{ + int size; + + size = sb->s_blocksize - + offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); + + return size / sizeof(struct ocfs2_truncate_rec); +} +#else +static inline int ocfs2_fast_symlink_chars(int blocksize) +{ + return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); +} + +static inline int ocfs2_extent_recs_per_inode(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_dinode, id2.i_list.l_recs); + + return size / sizeof(struct ocfs2_extent_rec); +} + +static inline int ocfs2_chain_recs_per_inode(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); + + return size / sizeof(struct ocfs2_chain_rec); +} + +static inline int ocfs2_extent_recs_per_eb(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_extent_block, h_list.l_recs); + + return size / sizeof(struct ocfs2_extent_rec); +} + +static inline int ocfs2_local_alloc_size(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); + + return size; +} + +static inline int ocfs2_group_bitmap_size(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_group_desc, bg_bitmap); + + return size; +} + +static inline int ocfs2_truncate_recs_per_inode(int blocksize) +{ + int size; + + size = blocksize - + offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); + + return size / sizeof(struct ocfs2_truncate_rec); +} +#endif /* __KERNEL__ */ + + +static inline int ocfs2_system_inode_is_global(int type) +{ + return ((type >= 0) && + (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); +} + +static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, + int type, int slot) +{ + int chars; + + /* + * Global system inodes can only have one copy. Everything + * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode + * list has a copy per slot. + */ + if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) + chars = snprintf(buf, len, + ocfs2_system_inodes[type].si_name); + else + chars = snprintf(buf, len, + ocfs2_system_inodes[type].si_name, + slot); + + return chars; +} + +static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, + umode_t mode) +{ + de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; +} + +#endif /* _OCFS2_FS_H */ + diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h new file mode 100644 index 0000000..7dd9e1e --- /dev/null +++ b/fs/ocfs2/ocfs2_lockid.h @@ -0,0 +1,73 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2_lockid.h + * + * Defines OCFS2 lockid bits. + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_LOCKID_H +#define OCFS2_LOCKID_H + +/* lock ids are made up in the following manner: + * name[0] --> type + * name[1-6] --> 6 pad characters, reserved for now + * name[7-22] --> block number, expressed in hex as 16 chars + * name[23-30] --> i_generation, expressed in hex 8 chars + * name[31] --> '\0' */ +#define OCFS2_LOCK_ID_MAX_LEN 32 +#define OCFS2_LOCK_ID_PAD "000000" + +enum ocfs2_lock_type { + OCFS2_LOCK_TYPE_META = 0, + OCFS2_LOCK_TYPE_DATA, + OCFS2_LOCK_TYPE_SUPER, + OCFS2_LOCK_TYPE_RENAME, + OCFS2_LOCK_TYPE_RW, + OCFS2_NUM_LOCK_TYPES +}; + +static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type) +{ + char c; + switch (type) { + case OCFS2_LOCK_TYPE_META: + c = 'M'; + break; + case OCFS2_LOCK_TYPE_DATA: + c = 'D'; + break; + case OCFS2_LOCK_TYPE_SUPER: + c = 'S'; + break; + case OCFS2_LOCK_TYPE_RENAME: + c = 'R'; + break; + case OCFS2_LOCK_TYPE_RW: + c = 'W'; + break; + default: + c = '\0'; + } + + return c; +} + +#endif /* OCFS2_LOCKID_H */ diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c new file mode 100644 index 0000000..8716279 --- /dev/null +++ b/fs/ocfs2/slot_map.c @@ -0,0 +1,303 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * slot_map.c + * + * + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/smp_lock.h> + +#define MLOG_MASK_PREFIX ML_SUPER +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "dlmglue.h" +#include "extent_map.h" +#include "heartbeat.h" +#include "inode.h" +#include "slot_map.h" +#include "super.h" +#include "sysfile.h" + +#include "buffer_head_io.h" + +static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si, + s16 global); +static void __ocfs2_fill_slot(struct ocfs2_slot_info *si, + s16 slot_num, + s16 node_num); + +/* Use the slot information we've collected to create a map of mounted + * nodes. Should be holding an EX on super block. assumes slot info is + * up to date. Note that we call this *after* we find a slot, so our + * own node should be set in the map too... */ +void ocfs2_populate_mounted_map(struct ocfs2_super *osb) +{ + int i; + struct ocfs2_slot_info *si = osb->slot_info; + + spin_lock(&si->si_lock); + + for (i = 0; i < si->si_size; i++) + if (si->si_global_node_nums[i] != OCFS2_INVALID_SLOT) + ocfs2_node_map_set_bit(osb, &osb->mounted_map, + si->si_global_node_nums[i]); + + spin_unlock(&si->si_lock); +} + +/* post the slot information on disk into our slot_info struct. */ +void ocfs2_update_slot_info(struct ocfs2_slot_info *si) +{ + int i; + __le16 *disk_info; + + /* we don't read the slot block here as ocfs2_super_lock + * should've made sure we have the most recent copy. */ + spin_lock(&si->si_lock); + disk_info = (__le16 *) si->si_bh->b_data; + + for (i = 0; i < si->si_size; i++) + si->si_global_node_nums[i] = le16_to_cpu(disk_info[i]); + + spin_unlock(&si->si_lock); +} + +/* post the our slot info stuff into it's destination bh and write it + * out. */ +int ocfs2_update_disk_slots(struct ocfs2_super *osb, + struct ocfs2_slot_info *si) +{ + int status, i; + __le16 *disk_info = (__le16 *) si->si_bh->b_data; + + spin_lock(&si->si_lock); + for (i = 0; i < si->si_size; i++) + disk_info[i] = cpu_to_le16(si->si_global_node_nums[i]); + spin_unlock(&si->si_lock); + + status = ocfs2_write_block(osb, si->si_bh, si->si_inode); + if (status < 0) + mlog_errno(status); + + return status; +} + +/* try to find global node in the slot info. Returns + * OCFS2_INVALID_SLOT if nothing is found. */ +static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si, + s16 global) +{ + int i; + s16 ret = OCFS2_INVALID_SLOT; + + for(i = 0; i < si->si_num_slots; i++) { + if (global == si->si_global_node_nums[i]) { + ret = (s16) i; + break; + } + } + return ret; +} + +static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si) +{ + int i; + s16 ret = OCFS2_INVALID_SLOT; + + for(i = 0; i < si->si_num_slots; i++) { + if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) { + ret = (s16) i; + break; + } + } + return ret; +} + +s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si, + s16 global) +{ + s16 ret; + + spin_lock(&si->si_lock); + ret = __ocfs2_node_num_to_slot(si, global); + spin_unlock(&si->si_lock); + return ret; +} + +static void __ocfs2_fill_slot(struct ocfs2_slot_info *si, + s16 slot_num, + s16 node_num) +{ + BUG_ON(slot_num == OCFS2_INVALID_SLOT); + BUG_ON(slot_num >= si->si_num_slots); + BUG_ON((node_num != O2NM_INVALID_NODE_NUM) && + (node_num >= O2NM_MAX_NODES)); + + si->si_global_node_nums[slot_num] = node_num; +} + +void ocfs2_clear_slot(struct ocfs2_slot_info *si, + s16 slot_num) +{ + spin_lock(&si->si_lock); + __ocfs2_fill_slot(si, slot_num, OCFS2_INVALID_SLOT); + spin_unlock(&si->si_lock); +} + +int ocfs2_init_slot_info(struct ocfs2_super *osb) +{ + int status, i; + u64 blkno; + struct inode *inode = NULL; + struct buffer_head *bh = NULL; + struct ocfs2_slot_info *si; + + si = kcalloc(1, sizeof(struct ocfs2_slot_info), GFP_KERNEL); + if (!si) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + spin_lock_init(&si->si_lock); + si->si_num_slots = osb->max_slots; + si->si_size = OCFS2_MAX_SLOTS; + + for(i = 0; i < si->si_num_slots; i++) + si->si_global_node_nums[i] = OCFS2_INVALID_SLOT; + + inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_extent_map_get_blocks(inode, 0ULL, 1, &blkno, NULL); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_read_block(osb, blkno, &bh, 0, inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + si->si_inode = inode; + si->si_bh = bh; + osb->slot_info = si; +bail: + if (status < 0 && si) + ocfs2_free_slot_info(si); + + return status; +} + +void ocfs2_free_slot_info(struct ocfs2_slot_info *si) +{ + if (si->si_inode) + iput(si->si_inode); + if (si->si_bh) + brelse(si->si_bh); + kfree(si); +} + +int ocfs2_find_slot(struct ocfs2_super *osb) +{ + int status; + s16 slot; + struct ocfs2_slot_info *si; + + mlog_entry_void(); + + si = osb->slot_info; + + ocfs2_update_slot_info(si); + + spin_lock(&si->si_lock); + /* search for ourselves first and take the slot if it already + * exists. Perhaps we need to mark this in a variable for our + * own journal recovery? Possibly not, though we certainly + * need to warn to the user */ + slot = __ocfs2_node_num_to_slot(si, osb->node_num); + if (slot == OCFS2_INVALID_SLOT) { + /* if no slot yet, then just take 1st available + * one. */ + slot = __ocfs2_find_empty_slot(si); + if (slot == OCFS2_INVALID_SLOT) { + spin_unlock(&si->si_lock); + mlog(ML_ERROR, "no free slots available!\n"); + status = -EINVAL; + goto bail; + } + } else + mlog(ML_NOTICE, "slot %d is already allocated to this node!\n", + slot); + + __ocfs2_fill_slot(si, slot, osb->node_num); + osb->slot_num = slot; + spin_unlock(&si->si_lock); + + mlog(ML_NOTICE, "taking node slot %d\n", osb->slot_num); + + status = ocfs2_update_disk_slots(osb, si); + if (status < 0) + mlog_errno(status); + +bail: + mlog_exit(status); + return status; +} + +void ocfs2_put_slot(struct ocfs2_super *osb) +{ + int status; + struct ocfs2_slot_info *si = osb->slot_info; + + if (!si) + return; + + ocfs2_update_slot_info(si); + + spin_lock(&si->si_lock); + __ocfs2_fill_slot(si, osb->slot_num, OCFS2_INVALID_SLOT); + osb->slot_num = OCFS2_INVALID_SLOT; + spin_unlock(&si->si_lock); + + status = ocfs2_update_disk_slots(osb, si); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + osb->slot_info = NULL; + ocfs2_free_slot_info(si); +} + diff --git a/fs/ocfs2/slot_map.h b/fs/ocfs2/slot_map.h new file mode 100644 index 0000000..d8c8cee --- /dev/null +++ b/fs/ocfs2/slot_map.h @@ -0,0 +1,66 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * slotmap.h + * + * description here + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + + +#ifndef SLOTMAP_H +#define SLOTMAP_H + +struct ocfs2_slot_info { + spinlock_t si_lock; + + struct inode *si_inode; + struct buffer_head *si_bh; + unsigned int si_num_slots; + unsigned int si_size; + s16 si_global_node_nums[OCFS2_MAX_SLOTS]; +}; + +int ocfs2_init_slot_info(struct ocfs2_super *osb); +void ocfs2_free_slot_info(struct ocfs2_slot_info *si); + +int ocfs2_find_slot(struct ocfs2_super *osb); +void ocfs2_put_slot(struct ocfs2_super *osb); + +void ocfs2_update_slot_info(struct ocfs2_slot_info *si); +int ocfs2_update_disk_slots(struct ocfs2_super *osb, + struct ocfs2_slot_info *si); + +s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si, + s16 global); +void ocfs2_clear_slot(struct ocfs2_slot_info *si, + s16 slot_num); + +void ocfs2_populate_mounted_map(struct ocfs2_super *osb); + +static inline int ocfs2_is_empty_slot(struct ocfs2_slot_info *si, + int slot_num) +{ + BUG_ON(slot_num == OCFS2_INVALID_SLOT); + assert_spin_locked(&si->si_lock); + + return si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT; +} + +#endif diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c new file mode 100644 index 0000000..c46c164 --- /dev/null +++ b/fs/ocfs2/suballoc.c @@ -0,0 +1,1651 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * suballoc.c + * + * metadata alloc and free + * Inspired by ext3 block groups. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#define MLOG_MASK_PREFIX ML_DISK_ALLOC +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "suballoc.h" +#include "super.h" +#include "sysfile.h" +#include "uptodate.h" + +#include "buffer_head_io.h" + +static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg); +static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe); +static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl); +static int ocfs2_block_group_fill(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *bg_bh, + u64 group_blkno, + u16 my_chain, + struct ocfs2_chain_list *cl); +static int ocfs2_block_group_alloc(struct ocfs2_super *osb, + struct inode *alloc_inode, + struct buffer_head *bh); + +static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac); + +static int ocfs2_cluster_group_search(struct inode *inode, + struct buffer_head *group_bh, + u32 bits_wanted, u32 min_bits, + u16 *bit_off, u16 *bits_found); +static int ocfs2_block_group_search(struct inode *inode, + struct buffer_head *group_bh, + u32 bits_wanted, u32 min_bits, + u16 *bit_off, u16 *bits_found); +static int ocfs2_search_chain(struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u32 min_bits, + u16 *bit_off, + unsigned int *num_bits, + u64 *bg_blkno); +static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u32 min_bits, + u16 *bit_off, + unsigned int *num_bits, + u64 *bg_blkno); +static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, + int nr); +static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb, + struct buffer_head *bg_bh, + unsigned int bits_wanted, + u16 *bit_off, + u16 *bits_found); +static inline int ocfs2_block_group_set_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct ocfs2_group_desc *bg, + struct buffer_head *group_bh, + unsigned int bit_off, + unsigned int num_bits); +static inline int ocfs2_block_group_clear_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct ocfs2_group_desc *bg, + struct buffer_head *group_bh, + unsigned int bit_off, + unsigned int num_bits); + +static int ocfs2_relink_block_group(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *fe_bh, + struct buffer_head *bg_bh, + struct buffer_head *prev_bg_bh, + u16 chain); +static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, + u32 wanted); +static int ocfs2_free_suballoc_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *alloc_bh, + unsigned int start_bit, + u64 bg_blkno, + unsigned int count); +static inline u64 ocfs2_which_suballoc_group(u64 block, + unsigned int bit); +static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, + u64 bg_blkno, + u16 bg_bit_off); +static inline u64 ocfs2_which_cluster_group(struct inode *inode, + u32 cluster); +static inline void ocfs2_block_to_cluster_group(struct inode *inode, + u64 data_blkno, + u64 *bg_blkno, + u16 *bg_bit_off); + +void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac) +{ + if (ac->ac_inode) + iput(ac->ac_inode); + if (ac->ac_bh) + brelse(ac->ac_bh); + kfree(ac); +} + +static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl) +{ + return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc); +} + +static int ocfs2_block_group_fill(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *bg_bh, + u64 group_blkno, + u16 my_chain, + struct ocfs2_chain_list *cl) +{ + int status = 0; + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; + struct super_block * sb = alloc_inode->i_sb; + + mlog_entry_void(); + + if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) { + ocfs2_error(alloc_inode->i_sb, "group block (%"MLFu64") " + "!= b_blocknr (%llu)", group_blkno, + (unsigned long long) bg_bh->b_blocknr); + status = -EIO; + goto bail; + } + + status = ocfs2_journal_access(handle, + alloc_inode, + bg_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + memset(bg, 0, sb->s_blocksize); + strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE); + bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); + bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb)); + bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl)); + bg->bg_chain = cpu_to_le16(my_chain); + bg->bg_next_group = cl->cl_recs[my_chain].c_blkno; + bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno); + bg->bg_blkno = cpu_to_le64(group_blkno); + /* set the 1st bit in the bitmap to account for the descriptor block */ + ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap); + bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1); + + status = ocfs2_journal_dirty(handle, bg_bh); + if (status < 0) + mlog_errno(status); + + /* There is no need to zero out or otherwise initialize the + * other blocks in a group - All valid FS metadata in a block + * group stores the superblock fs_generation value at + * allocation time. */ + +bail: + mlog_exit(status); + return status; +} + +static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl) +{ + u16 curr, best; + + best = curr = 0; + while (curr < le16_to_cpu(cl->cl_count)) { + if (le32_to_cpu(cl->cl_recs[best].c_total) > + le32_to_cpu(cl->cl_recs[curr].c_total)) + best = curr; + curr++; + } + return best; +} + +/* + * We expect the block group allocator to already be locked. + */ +static int ocfs2_block_group_alloc(struct ocfs2_super *osb, + struct inode *alloc_inode, + struct buffer_head *bh) +{ + int status, credits; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data; + struct ocfs2_chain_list *cl; + struct ocfs2_alloc_context *ac = NULL; + struct ocfs2_journal_handle *handle = NULL; + u32 bit_off, num_bits; + u16 alloc_rec; + u64 bg_blkno; + struct buffer_head *bg_bh = NULL; + struct ocfs2_group_desc *bg; + + BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode)); + + mlog_entry_void(); + + handle = ocfs2_alloc_handle(osb); + if (!handle) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + cl = &fe->id2.i_chain; + status = ocfs2_reserve_clusters(osb, + handle, + le16_to_cpu(cl->cl_cpg), + &ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + credits = ocfs2_calc_group_alloc_credits(osb->sb, + le16_to_cpu(cl->cl_cpg)); + handle = ocfs2_start_trans(osb, handle, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_claim_clusters(osb, + handle, + ac, + le16_to_cpu(cl->cl_cpg), + &bit_off, + &num_bits); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + alloc_rec = ocfs2_find_smallest_chain(cl); + + /* setup the group */ + bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off); + mlog(0, "new descriptor, record %u, at block %"MLFu64"\n", + alloc_rec, bg_blkno); + + bg_bh = sb_getblk(osb->sb, bg_blkno); + if (!bg_bh) { + status = -EIO; + mlog_errno(status); + goto bail; + } + ocfs2_set_new_buffer_uptodate(alloc_inode, bg_bh); + + status = ocfs2_block_group_fill(handle, + alloc_inode, + bg_bh, + bg_blkno, + alloc_rec, + cl); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + bg = (struct ocfs2_group_desc *) bg_bh->b_data; + + status = ocfs2_journal_access(handle, alloc_inode, + bh, OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + le32_add_cpu(&cl->cl_recs[alloc_rec].c_free, + le16_to_cpu(bg->bg_free_bits_count)); + le32_add_cpu(&cl->cl_recs[alloc_rec].c_total, le16_to_cpu(bg->bg_bits)); + cl->cl_recs[alloc_rec].c_blkno = cpu_to_le64(bg_blkno); + if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count)) + le16_add_cpu(&cl->cl_next_free_rec, 1); + + le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) - + le16_to_cpu(bg->bg_free_bits_count)); + le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits)); + le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg)); + + status = ocfs2_journal_dirty(handle, bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + spin_lock(&OCFS2_I(alloc_inode)->ip_lock); + OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb, + le32_to_cpu(fe->i_clusters))); + spin_unlock(&OCFS2_I(alloc_inode)->ip_lock); + i_size_write(alloc_inode, le64_to_cpu(fe->i_size)); + alloc_inode->i_blocks = + ocfs2_align_bytes_to_sectors(i_size_read(alloc_inode)); + + status = 0; +bail: + if (handle) + ocfs2_commit_trans(handle); + + if (ac) + ocfs2_free_alloc_context(ac); + + if (bg_bh) + brelse(bg_bh); + + mlog_exit(status); + return status; +} + +static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac) +{ + int status; + u32 bits_wanted = ac->ac_bits_wanted; + struct inode *alloc_inode = ac->ac_inode; + struct buffer_head *bh = NULL; + struct ocfs2_journal_handle *handle = ac->ac_handle; + struct ocfs2_dinode *fe; + u32 free_bits; + + mlog_entry_void(); + + BUG_ON(handle->flags & OCFS2_HANDLE_STARTED); + + ocfs2_handle_add_inode(handle, alloc_inode); + status = ocfs2_meta_lock(alloc_inode, handle, &bh, 1); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + fe = (struct ocfs2_dinode *) bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(alloc_inode->i_sb, fe); + status = -EIO; + goto bail; + } + if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) { + ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator " + "# %"MLFu64, le64_to_cpu(fe->i_blkno)); + status = -EIO; + goto bail; + } + + free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) - + le32_to_cpu(fe->id1.bitmap1.i_used); + + if (bits_wanted > free_bits) { + /* cluster bitmap never grows */ + if (ocfs2_is_cluster_bitmap(alloc_inode)) { + mlog(0, "Disk Full: wanted=%u, free_bits=%u\n", + bits_wanted, free_bits); + status = -ENOSPC; + goto bail; + } + + status = ocfs2_block_group_alloc(osb, alloc_inode, bh); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + atomic_inc(&osb->alloc_stats.bg_extends); + + /* You should never ask for this much metadata */ + BUG_ON(bits_wanted > + (le32_to_cpu(fe->id1.bitmap1.i_total) + - le32_to_cpu(fe->id1.bitmap1.i_used))); + } + + get_bh(bh); + ac->ac_bh = bh; +bail: + if (bh) + brelse(bh); + + mlog_exit(status); + return status; +} + +int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_dinode *fe, + struct ocfs2_alloc_context **ac) +{ + int status; + struct inode *alloc_inode = NULL; + + *ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL); + if (!(*ac)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_bits_wanted = ocfs2_extend_meta_needed(fe); + (*ac)->ac_handle = handle; + (*ac)->ac_which = OCFS2_AC_USE_META; + +#ifndef OCFS2_USE_ALL_METADATA_SUBALLOCATORS + alloc_inode = ocfs2_get_system_file_inode(osb, + EXTENT_ALLOC_SYSTEM_INODE, + 0); +#else + alloc_inode = ocfs2_get_system_file_inode(osb, + EXTENT_ALLOC_SYSTEM_INODE, + osb->slot_num); +#endif + if (!alloc_inode) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_inode = igrab(alloc_inode); + (*ac)->ac_group_search = ocfs2_block_group_search; + + status = ocfs2_reserve_suballoc_bits(osb, (*ac)); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + if ((status < 0) && *ac) { + ocfs2_free_alloc_context(*ac); + *ac = NULL; + } + + if (alloc_inode) + iput(alloc_inode); + + mlog_exit(status); + return status; +} + +int ocfs2_reserve_new_inode(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context **ac) +{ + int status; + struct inode *alloc_inode = NULL; + + *ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL); + if (!(*ac)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_bits_wanted = 1; + (*ac)->ac_handle = handle; + (*ac)->ac_which = OCFS2_AC_USE_INODE; + + alloc_inode = ocfs2_get_system_file_inode(osb, + INODE_ALLOC_SYSTEM_INODE, + osb->slot_num); + if (!alloc_inode) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_inode = igrab(alloc_inode); + (*ac)->ac_group_search = ocfs2_block_group_search; + + status = ocfs2_reserve_suballoc_bits(osb, *ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + if ((status < 0) && *ac) { + ocfs2_free_alloc_context(*ac); + *ac = NULL; + } + + if (alloc_inode) + iput(alloc_inode); + + mlog_exit(status); + return status; +} + +/* local alloc code has to do the same thing, so rather than do this + * twice.. */ +int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac) +{ + int status; + + ac->ac_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!ac->ac_inode) { + status = -EINVAL; + mlog(ML_ERROR, "Could not get bitmap inode!\n"); + goto bail; + } + ac->ac_which = OCFS2_AC_USE_MAIN; + ac->ac_group_search = ocfs2_cluster_group_search; + + status = ocfs2_reserve_suballoc_bits(osb, ac); + if (status < 0 && status != -ENOSPC) + mlog_errno(status); +bail: + return status; +} + +/* Callers don't need to care which bitmap (local alloc or main) to + * use so we figure it out for them, but unfortunately this clutters + * things a bit. */ +int ocfs2_reserve_clusters(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + u32 bits_wanted, + struct ocfs2_alloc_context **ac) +{ + int status; + + mlog_entry_void(); + + BUG_ON(!handle); + + *ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL); + if (!(*ac)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + (*ac)->ac_bits_wanted = bits_wanted; + (*ac)->ac_handle = handle; + + status = -ENOSPC; + if (ocfs2_alloc_should_use_local(osb, bits_wanted)) { + status = ocfs2_reserve_local_alloc_bits(osb, + handle, + bits_wanted, + *ac); + if ((status < 0) && (status != -ENOSPC)) { + mlog_errno(status); + goto bail; + } else if (status == -ENOSPC) { + /* reserve_local_bits will return enospc with + * the local alloc inode still locked, so we + * can change this safely here. */ + mlog(0, "Disabling local alloc\n"); + /* We set to OCFS2_LA_DISABLED so that umount + * can clean up what's left of the local + * allocation */ + osb->local_alloc_state = OCFS2_LA_DISABLED; + } + } + + if (status == -ENOSPC) { + status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + } + + status = 0; +bail: + if ((status < 0) && *ac) { + ocfs2_free_alloc_context(*ac); + *ac = NULL; + } + + mlog_exit(status); + return status; +} + +/* + * More or less lifted from ext3. I'll leave their description below: + * + * "For ext3 allocations, we must not reuse any blocks which are + * allocated in the bitmap buffer's "last committed data" copy. This + * prevents deletes from freeing up the page for reuse until we have + * committed the delete transaction. + * + * If we didn't do this, then deleting something and reallocating it as + * data would allow the old block to be overwritten before the + * transaction committed (because we force data to disk before commit). + * This would lead to corruption if we crashed between overwriting the + * data and committing the delete. + * + * @@@ We may want to make this allocation behaviour conditional on + * data-writes at some point, and disable it for metadata allocations or + * sync-data inodes." + * + * Note: OCFS2 already does this differently for metadata vs data + * allocations, as those bitmaps are seperate and undo access is never + * called on a metadata group descriptor. + */ +static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, + int nr) +{ + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; + + if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap)) + return 0; + if (!buffer_jbd(bg_bh) || !bh2jh(bg_bh)->b_committed_data) + return 1; + + bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data; + return !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap); +} + +static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb, + struct buffer_head *bg_bh, + unsigned int bits_wanted, + u16 *bit_off, + u16 *bits_found) +{ + void *bitmap; + u16 best_offset, best_size; + int offset, start, found, status = 0; + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; + + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(osb->sb, bg); + return -EIO; + } + + found = start = best_offset = best_size = 0; + bitmap = bg->bg_bitmap; + + while((offset = ocfs2_find_next_zero_bit(bitmap, + le16_to_cpu(bg->bg_bits), + start)) != -1) { + if (offset == le16_to_cpu(bg->bg_bits)) + break; + + if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) { + /* We found a zero, but we can't use it as it + * hasn't been put to disk yet! */ + found = 0; + start = offset + 1; + } else if (offset == start) { + /* we found a zero */ + found++; + /* move start to the next bit to test */ + start++; + } else { + /* got a zero after some ones */ + found = 1; + start = offset + 1; + } + if (found > best_size) { + best_size = found; + best_offset = start - found; + } + /* we got everything we needed */ + if (found == bits_wanted) { + /* mlog(0, "Found it all!\n"); */ + break; + } + } + + /* XXX: I think the first clause is equivalent to the second + * - jlbec */ + if (found == bits_wanted) { + *bit_off = start - found; + *bits_found = found; + } else if (best_size) { + *bit_off = best_offset; + *bits_found = best_size; + } else { + status = -ENOSPC; + /* No error log here -- see the comment above + * ocfs2_test_bg_bit_allocatable */ + } + + return status; +} + +static inline int ocfs2_block_group_set_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct ocfs2_group_desc *bg, + struct buffer_head *group_bh, + unsigned int bit_off, + unsigned int num_bits) +{ + int status; + void *bitmap = bg->bg_bitmap; + int journal_type = OCFS2_JOURNAL_ACCESS_WRITE; + + mlog_entry_void(); + + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg); + status = -EIO; + goto bail; + } + BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits); + + mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off, + num_bits); + + if (ocfs2_is_cluster_bitmap(alloc_inode)) + journal_type = OCFS2_JOURNAL_ACCESS_UNDO; + + status = ocfs2_journal_access(handle, + alloc_inode, + group_bh, + journal_type); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + le16_add_cpu(&bg->bg_free_bits_count, -num_bits); + + while(num_bits--) + ocfs2_set_bit(bit_off++, bitmap); + + status = ocfs2_journal_dirty(handle, + group_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + mlog_exit(status); + return status; +} + +/* find the one with the most empty bits */ +static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl) +{ + u16 curr, best; + + BUG_ON(!cl->cl_next_free_rec); + + best = curr = 0; + while (curr < le16_to_cpu(cl->cl_next_free_rec)) { + if (le32_to_cpu(cl->cl_recs[curr].c_free) > + le32_to_cpu(cl->cl_recs[best].c_free)) + best = curr; + curr++; + } + + BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec)); + return best; +} + +static int ocfs2_relink_block_group(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *fe_bh, + struct buffer_head *bg_bh, + struct buffer_head *prev_bg_bh, + u16 chain) +{ + int status; + /* there is a really tiny chance the journal calls could fail, + * but we wouldn't want inconsistent blocks in *any* case. */ + u64 fe_ptr, bg_ptr, prev_bg_ptr; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; + struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data; + + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(alloc_inode->i_sb, fe); + status = -EIO; + goto out; + } + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg); + status = -EIO; + goto out; + } + if (!OCFS2_IS_VALID_GROUP_DESC(prev_bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, prev_bg); + status = -EIO; + goto out; + } + + mlog(0, "In suballoc %"MLFu64", chain %u, move group %"MLFu64" to " + "top, prev = %"MLFu64"\n", + fe->i_blkno, chain, bg->bg_blkno, prev_bg->bg_blkno); + + fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno); + bg_ptr = le64_to_cpu(bg->bg_next_group); + prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group); + + status = ocfs2_journal_access(handle, alloc_inode, prev_bg_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + prev_bg->bg_next_group = bg->bg_next_group; + + status = ocfs2_journal_dirty(handle, prev_bg_bh); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + status = ocfs2_journal_access(handle, alloc_inode, bg_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno; + + status = ocfs2_journal_dirty(handle, bg_bh); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + status = ocfs2_journal_access(handle, alloc_inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno; + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto out_rollback; + } + + status = 0; +out_rollback: + if (status < 0) { + fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr); + bg->bg_next_group = cpu_to_le64(bg_ptr); + prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); + } +out: + mlog_exit(status); + return status; +} + +static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, + u32 wanted) +{ + return le16_to_cpu(bg->bg_free_bits_count) > wanted; +} + +/* return 0 on success, -ENOSPC to keep searching and any other < 0 + * value on error. */ +static int ocfs2_cluster_group_search(struct inode *inode, + struct buffer_head *group_bh, + u32 bits_wanted, u32 min_bits, + u16 *bit_off, u16 *bits_found) +{ + int search = -ENOSPC; + int ret; + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data; + u16 tmp_off, tmp_found; + + BUG_ON(!ocfs2_is_cluster_bitmap(inode)); + + if (bg->bg_free_bits_count) { + ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb), + group_bh, bits_wanted, + &tmp_off, &tmp_found); + if (ret) + return ret; + + /* ocfs2_block_group_find_clear_bits() might + * return success, but we still want to return + * -ENOSPC unless it found the minimum number + * of bits. */ + if (min_bits <= tmp_found) { + *bit_off = tmp_off; + *bits_found = tmp_found; + search = 0; /* success */ + } + } + + return search; +} + +static int ocfs2_block_group_search(struct inode *inode, + struct buffer_head *group_bh, + u32 bits_wanted, u32 min_bits, + u16 *bit_off, u16 *bits_found) +{ + int ret = -ENOSPC; + struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data; + + BUG_ON(min_bits != 1); + BUG_ON(ocfs2_is_cluster_bitmap(inode)); + + if (bg->bg_free_bits_count) + ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb), + group_bh, bits_wanted, + bit_off, bits_found); + + return ret; +} + +static int ocfs2_search_chain(struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u32 min_bits, + u16 *bit_off, + unsigned int *num_bits, + u64 *bg_blkno) +{ + int status; + u16 chain, tmp_bits; + u32 tmp_used; + u64 next_group; + struct ocfs2_journal_handle *handle = ac->ac_handle; + struct inode *alloc_inode = ac->ac_inode; + struct buffer_head *group_bh = NULL; + struct buffer_head *prev_group_bh = NULL; + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; + struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; + struct ocfs2_group_desc *bg; + + chain = ac->ac_chain; + mlog(0, "trying to alloc %u bits from chain %u, inode %"MLFu64"\n", + bits_wanted, chain, OCFS2_I(alloc_inode)->ip_blkno); + + status = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb), + le64_to_cpu(cl->cl_recs[chain].c_blkno), + &group_bh, OCFS2_BH_CACHED, alloc_inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + bg = (struct ocfs2_group_desc *) group_bh->b_data; + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg); + status = -EIO; + goto bail; + } + + status = -ENOSPC; + /* for now, the chain search is a bit simplistic. We just use + * the 1st group with any empty bits. */ + while ((status = ac->ac_group_search(alloc_inode, group_bh, + bits_wanted, min_bits, bit_off, + &tmp_bits)) == -ENOSPC) { + if (!bg->bg_next_group) + break; + + if (prev_group_bh) { + brelse(prev_group_bh); + prev_group_bh = NULL; + } + next_group = le64_to_cpu(bg->bg_next_group); + prev_group_bh = group_bh; + group_bh = NULL; + status = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb), + next_group, &group_bh, + OCFS2_BH_CACHED, alloc_inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + bg = (struct ocfs2_group_desc *) group_bh->b_data; + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg); + status = -EIO; + goto bail; + } + } + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + mlog(0, "alloc succeeds: we give %u bits from block group %"MLFu64"\n", + tmp_bits, bg->bg_blkno); + + *num_bits = tmp_bits; + + BUG_ON(*num_bits == 0); + + /* + * Keep track of previous block descriptor read. When + * we find a target, if we have read more than X + * number of descriptors, and the target is reasonably + * empty, relink him to top of his chain. + * + * We've read 0 extra blocks and only send one more to + * the transaction, yet the next guy to search has a + * much easier time. + * + * Do this *after* figuring out how many bits we're taking out + * of our target group. + */ + if (ac->ac_allow_chain_relink && + (prev_group_bh) && + (ocfs2_block_group_reasonably_empty(bg, *num_bits))) { + status = ocfs2_relink_block_group(handle, alloc_inode, + ac->ac_bh, group_bh, + prev_group_bh, chain); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* Ok, claim our bits now: set the info on dinode, chainlist + * and then the group */ + status = ocfs2_journal_access(handle, + alloc_inode, + ac->ac_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used); + fe->id1.bitmap1.i_used = cpu_to_le32(*num_bits + tmp_used); + le32_add_cpu(&cl->cl_recs[chain].c_free, -(*num_bits)); + + status = ocfs2_journal_dirty(handle, + ac->ac_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_block_group_set_bits(handle, + alloc_inode, + bg, + group_bh, + *bit_off, + *num_bits); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + mlog(0, "Allocated %u bits from suballocator %"MLFu64"\n", + *num_bits, fe->i_blkno); + + *bg_blkno = le64_to_cpu(bg->bg_blkno); +bail: + if (group_bh) + brelse(group_bh); + if (prev_group_bh) + brelse(prev_group_bh); + + mlog_exit(status); + return status; +} + +/* will give out up to bits_wanted contiguous bits. */ +static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u32 min_bits, + u16 *bit_off, + unsigned int *num_bits, + u64 *bg_blkno) +{ + int status; + u16 victim, i; + struct ocfs2_chain_list *cl; + struct ocfs2_dinode *fe; + + mlog_entry_void(); + + BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); + BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given)); + BUG_ON(!ac->ac_bh); + + fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(osb->sb, fe); + status = -EIO; + goto bail; + } + if (le32_to_cpu(fe->id1.bitmap1.i_used) >= + le32_to_cpu(fe->id1.bitmap1.i_total)) { + ocfs2_error(osb->sb, "Chain allocator dinode %"MLFu64" has %u" + "used bits but only %u total.", + le64_to_cpu(fe->i_blkno), + le32_to_cpu(fe->id1.bitmap1.i_used), + le32_to_cpu(fe->id1.bitmap1.i_total)); + status = -EIO; + goto bail; + } + + cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; + + victim = ocfs2_find_victim_chain(cl); + ac->ac_chain = victim; + ac->ac_allow_chain_relink = 1; + + status = ocfs2_search_chain(ac, bits_wanted, min_bits, bit_off, + num_bits, bg_blkno); + if (!status) + goto bail; + if (status < 0 && status != -ENOSPC) { + mlog_errno(status); + goto bail; + } + + mlog(0, "Search of victim chain %u came up with nothing, " + "trying all chains now.\n", victim); + + /* If we didn't pick a good victim, then just default to + * searching each chain in order. Don't allow chain relinking + * because we only calculate enough journal credits for one + * relink per alloc. */ + ac->ac_allow_chain_relink = 0; + for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) { + if (i == victim) + continue; + if (!cl->cl_recs[i].c_free) + continue; + + ac->ac_chain = i; + status = ocfs2_search_chain(ac, bits_wanted, min_bits, + bit_off, num_bits, + bg_blkno); + if (!status) + break; + if (status < 0 && status != -ENOSPC) { + mlog_errno(status); + goto bail; + } + } +bail: + + mlog_exit(status); + return status; +} + +int ocfs2_claim_metadata(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u16 *suballoc_bit_start, + unsigned int *num_bits, + u64 *blkno_start) +{ + int status; + u64 bg_blkno; + + BUG_ON(!ac); + BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted)); + BUG_ON(ac->ac_which != OCFS2_AC_USE_META); + BUG_ON(ac->ac_handle != handle); + + status = ocfs2_claim_suballoc_bits(osb, + ac, + bits_wanted, + 1, + suballoc_bit_start, + num_bits, + &bg_blkno); + if (status < 0) { + mlog_errno(status); + goto bail; + } + atomic_inc(&osb->alloc_stats.bg_allocs); + + *blkno_start = bg_blkno + (u64) *suballoc_bit_start; + ac->ac_bits_given += (*num_bits); + status = 0; +bail: + mlog_exit(status); + return status; +} + +int ocfs2_claim_new_inode(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u16 *suballoc_bit, + u64 *fe_blkno) +{ + int status; + unsigned int num_bits; + u64 bg_blkno; + + mlog_entry_void(); + + BUG_ON(!ac); + BUG_ON(ac->ac_bits_given != 0); + BUG_ON(ac->ac_bits_wanted != 1); + BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE); + BUG_ON(ac->ac_handle != handle); + + status = ocfs2_claim_suballoc_bits(osb, + ac, + 1, + 1, + suballoc_bit, + &num_bits, + &bg_blkno); + if (status < 0) { + mlog_errno(status); + goto bail; + } + atomic_inc(&osb->alloc_stats.bg_allocs); + + BUG_ON(num_bits != 1); + + *fe_blkno = bg_blkno + (u64) (*suballoc_bit); + ac->ac_bits_given++; + status = 0; +bail: + mlog_exit(status); + return status; +} + +/* translate a group desc. blkno and it's bitmap offset into + * disk cluster offset. */ +static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, + u64 bg_blkno, + u16 bg_bit_off) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + u32 cluster = 0; + + BUG_ON(!ocfs2_is_cluster_bitmap(inode)); + + if (bg_blkno != osb->first_cluster_group_blkno) + cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno); + cluster += (u32) bg_bit_off; + return cluster; +} + +/* given a cluster offset, calculate which block group it belongs to + * and return that block offset. */ +static inline u64 ocfs2_which_cluster_group(struct inode *inode, + u32 cluster) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + u32 group_no; + + BUG_ON(!ocfs2_is_cluster_bitmap(inode)); + + group_no = cluster / osb->bitmap_cpg; + if (!group_no) + return osb->first_cluster_group_blkno; + return ocfs2_clusters_to_blocks(inode->i_sb, + group_no * osb->bitmap_cpg); +} + +/* given the block number of a cluster start, calculate which cluster + * group and descriptor bitmap offset that corresponds to. */ +static inline void ocfs2_block_to_cluster_group(struct inode *inode, + u64 data_blkno, + u64 *bg_blkno, + u16 *bg_bit_off) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno); + + BUG_ON(!ocfs2_is_cluster_bitmap(inode)); + + *bg_blkno = ocfs2_which_cluster_group(inode, + data_cluster); + + if (*bg_blkno == osb->first_cluster_group_blkno) + *bg_bit_off = (u16) data_cluster; + else + *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb, + data_blkno - *bg_blkno); +} + +/* + * min_bits - minimum contiguous chunk from this total allocation we + * can handle. set to what we asked for originally for a full + * contig. allocation, set to '1' to indicate we can deal with extents + * of any size. + */ +int ocfs2_claim_clusters(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 min_clusters, + u32 *cluster_start, + u32 *num_clusters) +{ + int status; + unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given; + u64 bg_blkno; + u16 bg_bit_off; + + mlog_entry_void(); + + BUG_ON(!ac); + BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); + + BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL + && ac->ac_which != OCFS2_AC_USE_MAIN); + BUG_ON(ac->ac_handle != handle); + + if (ac->ac_which == OCFS2_AC_USE_LOCAL) { + status = ocfs2_claim_local_alloc_bits(osb, + handle, + ac, + bits_wanted, + cluster_start, + num_clusters); + if (!status) + atomic_inc(&osb->alloc_stats.local_data); + } else { + if (min_clusters > (osb->bitmap_cpg - 1)) { + /* The only paths asking for contiguousness + * should know about this already. */ + mlog(ML_ERROR, "minimum allocation requested exceeds " + "group bitmap size!"); + status = -ENOSPC; + goto bail; + } + /* clamp the current request down to a realistic size. */ + if (bits_wanted > (osb->bitmap_cpg - 1)) + bits_wanted = osb->bitmap_cpg - 1; + + status = ocfs2_claim_suballoc_bits(osb, + ac, + bits_wanted, + min_clusters, + &bg_bit_off, + num_clusters, + &bg_blkno); + if (!status) { + *cluster_start = + ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode, + bg_blkno, + bg_bit_off); + atomic_inc(&osb->alloc_stats.bitmap_data); + } + } + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + ac->ac_bits_given += *num_clusters; + +bail: + mlog_exit(status); + return status; +} + +static inline int ocfs2_block_group_clear_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct ocfs2_group_desc *bg, + struct buffer_head *group_bh, + unsigned int bit_off, + unsigned int num_bits) +{ + int status; + unsigned int tmp; + int journal_type = OCFS2_JOURNAL_ACCESS_WRITE; + struct ocfs2_group_desc *undo_bg = NULL; + + mlog_entry_void(); + + if (!OCFS2_IS_VALID_GROUP_DESC(bg)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg); + status = -EIO; + goto bail; + } + + mlog(0, "off = %u, num = %u\n", bit_off, num_bits); + + if (ocfs2_is_cluster_bitmap(alloc_inode)) + journal_type = OCFS2_JOURNAL_ACCESS_UNDO; + + status = ocfs2_journal_access(handle, alloc_inode, group_bh, + journal_type); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (ocfs2_is_cluster_bitmap(alloc_inode)) + undo_bg = (struct ocfs2_group_desc *) bh2jh(group_bh)->b_committed_data; + + tmp = num_bits; + while(tmp--) { + ocfs2_clear_bit((bit_off + tmp), + (unsigned long *) bg->bg_bitmap); + if (ocfs2_is_cluster_bitmap(alloc_inode)) + ocfs2_set_bit(bit_off + tmp, + (unsigned long *) undo_bg->bg_bitmap); + } + le16_add_cpu(&bg->bg_free_bits_count, num_bits); + + status = ocfs2_journal_dirty(handle, group_bh); + if (status < 0) + mlog_errno(status); +bail: + return status; +} + +/* + * expects the suballoc inode to already be locked. + */ +static int ocfs2_free_suballoc_bits(struct ocfs2_journal_handle *handle, + struct inode *alloc_inode, + struct buffer_head *alloc_bh, + unsigned int start_bit, + u64 bg_blkno, + unsigned int count) +{ + int status = 0; + u32 tmp_used; + struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb); + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data; + struct ocfs2_chain_list *cl = &fe->id2.i_chain; + struct buffer_head *group_bh = NULL; + struct ocfs2_group_desc *group; + + mlog_entry_void(); + + if (!OCFS2_IS_VALID_DINODE(fe)) { + OCFS2_RO_ON_INVALID_DINODE(alloc_inode->i_sb, fe); + status = -EIO; + goto bail; + } + BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl)); + + mlog(0, "suballocator %"MLFu64": freeing %u bits from group %"MLFu64 + ", starting at %u\n", + OCFS2_I(alloc_inode)->ip_blkno, count, bg_blkno, + start_bit); + + status = ocfs2_read_block(osb, bg_blkno, &group_bh, OCFS2_BH_CACHED, + alloc_inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + group = (struct ocfs2_group_desc *) group_bh->b_data; + if (!OCFS2_IS_VALID_GROUP_DESC(group)) { + OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, group); + status = -EIO; + goto bail; + } + BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits)); + + status = ocfs2_block_group_clear_bits(handle, alloc_inode, + group, group_bh, + start_bit, count); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_journal_access(handle, alloc_inode, alloc_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free, + count); + tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used); + fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count); + + status = ocfs2_journal_dirty(handle, alloc_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + +bail: + if (group_bh) + brelse(group_bh); + + mlog_exit(status); + return status; +} + +static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) +{ + u64 group = block - (u64) bit; + + return group; +} + +int ocfs2_free_dinode(struct ocfs2_journal_handle *handle, + struct inode *inode_alloc_inode, + struct buffer_head *inode_alloc_bh, + struct ocfs2_dinode *di) +{ + u64 blk = le64_to_cpu(di->i_blkno); + u16 bit = le16_to_cpu(di->i_suballoc_bit); + u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); + + return ocfs2_free_suballoc_bits(handle, inode_alloc_inode, + inode_alloc_bh, bit, bg_blkno, 1); +} + +int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle, + struct inode *eb_alloc_inode, + struct buffer_head *eb_alloc_bh, + struct ocfs2_extent_block *eb) +{ + u64 blk = le64_to_cpu(eb->h_blkno); + u16 bit = le16_to_cpu(eb->h_suballoc_bit); + u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); + + return ocfs2_free_suballoc_bits(handle, eb_alloc_inode, eb_alloc_bh, + bit, bg_blkno, 1); +} + +int ocfs2_free_clusters(struct ocfs2_journal_handle *handle, + struct inode *bitmap_inode, + struct buffer_head *bitmap_bh, + u64 start_blk, + unsigned int num_clusters) +{ + int status; + u16 bg_start_bit; + u64 bg_blkno; + struct ocfs2_dinode *fe; + + /* You can't ever have a contiguous set of clusters + * bigger than a block group bitmap so we never have to worry + * about looping on them. */ + + mlog_entry_void(); + + /* This is expensive. We can safely remove once this stuff has + * gotten tested really well. */ + BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk))); + + fe = (struct ocfs2_dinode *) bitmap_bh->b_data; + + ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno, + &bg_start_bit); + + mlog(0, "want to free %u clusters starting at block %"MLFu64"\n", + num_clusters, start_blk); + mlog(0, "bg_blkno = %"MLFu64", bg_start_bit = %u\n", + bg_blkno, bg_start_bit); + + status = ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh, + bg_start_bit, bg_blkno, + num_clusters); + if (status < 0) + mlog_errno(status); + + mlog_exit(status); + return status; +} + +static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg) +{ + printk("Block Group:\n"); + printk("bg_signature: %s\n", bg->bg_signature); + printk("bg_size: %u\n", bg->bg_size); + printk("bg_bits: %u\n", bg->bg_bits); + printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count); + printk("bg_chain: %u\n", bg->bg_chain); + printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation)); + printk("bg_next_group: %"MLFu64"\n", bg->bg_next_group); + printk("bg_parent_dinode: %"MLFu64"\n", bg->bg_parent_dinode); + printk("bg_blkno: %"MLFu64"\n", bg->bg_blkno); +} + +static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe) +{ + int i; + + printk("Suballoc Inode %"MLFu64":\n", fe->i_blkno); + printk("i_signature: %s\n", fe->i_signature); + printk("i_size: %"MLFu64"\n", fe->i_size); + printk("i_clusters: %u\n", fe->i_clusters); + printk("i_generation: %u\n", + le32_to_cpu(fe->i_generation)); + printk("id1.bitmap1.i_used: %u\n", + le32_to_cpu(fe->id1.bitmap1.i_used)); + printk("id1.bitmap1.i_total: %u\n", + le32_to_cpu(fe->id1.bitmap1.i_total)); + printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg); + printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc); + printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count); + printk("id2.i_chain.cl_next_free_rec: %u\n", + fe->id2.i_chain.cl_next_free_rec); + for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) { + printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i, + fe->id2.i_chain.cl_recs[i].c_free); + printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i, + fe->id2.i_chain.cl_recs[i].c_total); + printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %"MLFu64"\n", i, + fe->id2.i_chain.cl_recs[i].c_blkno); + } +} diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h new file mode 100644 index 0000000..a76c82a --- /dev/null +++ b/fs/ocfs2/suballoc.h @@ -0,0 +1,132 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * suballoc.h + * + * Defines sub allocator api + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _CHAINALLOC_H_ +#define _CHAINALLOC_H_ + +typedef int (group_search_t)(struct inode *, + struct buffer_head *, + u32, + u32, + u16 *, + u16 *); + +struct ocfs2_alloc_context { + struct inode *ac_inode; /* which bitmap are we allocating from? */ + struct buffer_head *ac_bh; /* file entry bh */ + u32 ac_bits_wanted; + u32 ac_bits_given; +#define OCFS2_AC_USE_LOCAL 1 +#define OCFS2_AC_USE_MAIN 2 +#define OCFS2_AC_USE_INODE 3 +#define OCFS2_AC_USE_META 4 + u32 ac_which; + struct ocfs2_journal_handle *ac_handle; + + /* these are used by the chain search */ + u16 ac_chain; + int ac_allow_chain_relink; + group_search_t *ac_group_search; +}; + +void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); +static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) +{ + return ac->ac_bits_wanted - ac->ac_bits_given; +} + +int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_dinode *fe, + struct ocfs2_alloc_context **ac); +int ocfs2_reserve_new_inode(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context **ac); +int ocfs2_reserve_clusters(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + u32 bits_wanted, + struct ocfs2_alloc_context **ac); + +int ocfs2_claim_metadata(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u16 *suballoc_bit_start, + u32 *num_bits, + u64 *blkno_start); +int ocfs2_claim_new_inode(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u16 *suballoc_bit, + u64 *fe_blkno); +int ocfs2_claim_clusters(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct ocfs2_alloc_context *ac, + u32 min_clusters, + u32 *cluster_start, + u32 *num_clusters); + +int ocfs2_free_dinode(struct ocfs2_journal_handle *handle, + struct inode *inode_alloc_inode, + struct buffer_head *inode_alloc_bh, + struct ocfs2_dinode *di); +int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle, + struct inode *eb_alloc_inode, + struct buffer_head *eb_alloc_bh, + struct ocfs2_extent_block *eb); +int ocfs2_free_clusters(struct ocfs2_journal_handle *handle, + struct inode *bitmap_inode, + struct buffer_head *bitmap_bh, + u64 start_blk, + unsigned int num_clusters); + +static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, + u64 bg_blkno) +{ + /* This should work for all block group descriptors as only + * the 1st group descriptor of the cluster bitmap is + * different. */ + + if (bg_blkno == osb->first_cluster_group_blkno) + return 0; + + /* the rest of the block groups are located at the beginning + * of their 1st cluster, so a direct translation just + * works. */ + return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); +} + +static inline int ocfs2_is_cluster_bitmap(struct inode *inode) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; +} + +/* This is for local alloc ONLY. Others should use the task-specific + * apis above. */ +int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac); + +#endif /* _CHAINALLOC_H_ */ diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c new file mode 100644 index 0000000..48bf7f0 --- /dev/null +++ b/fs/ocfs2/super.c @@ -0,0 +1,1733 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * super.c + * + * load/unload driver, mount/dismount volumes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/random.h> +#include <linux/statfs.h> +#include <linux/moduleparam.h> +#include <linux/blkdev.h> +#include <linux/socket.h> +#include <linux/inet.h> +#include <linux/parser.h> +#include <linux/crc32.h> +#include <linux/debugfs.h> + +#include <cluster/nodemanager.h> + +#define MLOG_MASK_PREFIX ML_SUPER +#include <cluster/masklog.h> + +#include "ocfs2.h" + +/* this should be the only file to include a version 1 header */ +#include "ocfs1_fs_compat.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "export.h" +#include "extent_map.h" +#include "heartbeat.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "namei.h" +#include "slot_map.h" +#include "super.h" +#include "sysfile.h" +#include "uptodate.h" +#include "ver.h" +#include "vote.h" + +#include "buffer_head_io.h" + +/* + * Globals + */ +static spinlock_t ocfs2_globals_lock = SPIN_LOCK_UNLOCKED; + +static u32 osb_id; /* Keeps track of next available OSB Id */ + +static kmem_cache_t *ocfs2_inode_cachep = NULL; + +kmem_cache_t *ocfs2_lock_cache = NULL; + +/* OCFS2 needs to schedule several differnt types of work which + * require cluster locking, disk I/O, recovery waits, etc. Since these + * types of work tend to be heavy we avoid using the kernel events + * workqueue and schedule on our own. */ +struct workqueue_struct *ocfs2_wq = NULL; + +static struct dentry *ocfs2_debugfs_root = NULL; + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); + +static int ocfs2_parse_options(struct super_block *sb, char *options, + unsigned long *mount_opt, int is_remount); +static void ocfs2_put_super(struct super_block *sb); +static int ocfs2_mount_volume(struct super_block *sb); +static int ocfs2_remount(struct super_block *sb, int *flags, char *data); +static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err); +static int ocfs2_initialize_mem_caches(void); +static void ocfs2_free_mem_caches(void); +static void ocfs2_delete_osb(struct ocfs2_super *osb); + +static int ocfs2_statfs(struct super_block *sb, struct kstatfs *buf); + +static int ocfs2_sync_fs(struct super_block *sb, int wait); + +static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb); +static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb); +static int ocfs2_release_system_inodes(struct ocfs2_super *osb); +static int ocfs2_fill_local_node_info(struct ocfs2_super *osb); +static int ocfs2_check_volume(struct ocfs2_super *osb); +static int ocfs2_verify_volume(struct ocfs2_dinode *di, + struct buffer_head *bh, + u32 sectsize); +static int ocfs2_initialize_super(struct super_block *sb, + struct buffer_head *bh, + int sector_size); +static int ocfs2_get_sector(struct super_block *sb, + struct buffer_head **bh, + int block, + int sect_size); +static void ocfs2_write_super(struct super_block *sb); +static struct inode *ocfs2_alloc_inode(struct super_block *sb); +static void ocfs2_destroy_inode(struct inode *inode); + +static unsigned long long ocfs2_max_file_offset(unsigned int blockshift); + +static struct super_operations ocfs2_sops = { + .statfs = ocfs2_statfs, + .alloc_inode = ocfs2_alloc_inode, + .destroy_inode = ocfs2_destroy_inode, + .drop_inode = ocfs2_drop_inode, + .clear_inode = ocfs2_clear_inode, + .delete_inode = ocfs2_delete_inode, + .sync_fs = ocfs2_sync_fs, + .write_super = ocfs2_write_super, + .put_super = ocfs2_put_super, + .remount_fs = ocfs2_remount, +}; + +enum { + Opt_barrier, + Opt_err_panic, + Opt_err_ro, + Opt_intr, + Opt_nointr, + Opt_hb_none, + Opt_hb_local, + Opt_data_ordered, + Opt_data_writeback, + Opt_err, +}; + +static match_table_t tokens = { + {Opt_barrier, "barrier=%u"}, + {Opt_err_panic, "errors=panic"}, + {Opt_err_ro, "errors=remount-ro"}, + {Opt_intr, "intr"}, + {Opt_nointr, "nointr"}, + {Opt_hb_none, OCFS2_HB_NONE}, + {Opt_hb_local, OCFS2_HB_LOCAL}, + {Opt_data_ordered, "data=ordered"}, + {Opt_data_writeback, "data=writeback"}, + {Opt_err, NULL} +}; + +/* + * write_super and sync_fs ripped right out of ext3. + */ +static void ocfs2_write_super(struct super_block *sb) +{ + if (down_trylock(&sb->s_lock) == 0) + BUG(); + sb->s_dirt = 0; +} + +static int ocfs2_sync_fs(struct super_block *sb, int wait) +{ + int status = 0; + tid_t target; + struct ocfs2_super *osb = OCFS2_SB(sb); + + sb->s_dirt = 0; + + if (ocfs2_is_hard_readonly(osb)) + return -EROFS; + + if (wait) { + status = ocfs2_flush_truncate_log(osb); + if (status < 0) + mlog_errno(status); + } else { + ocfs2_schedule_truncate_log_flush(osb, 0); + } + + if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) { + if (wait) + log_wait_commit(OCFS2_SB(sb)->journal->j_journal, + target); + } + return 0; +} + +static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb) +{ + struct inode *new = NULL; + int status = 0; + int i; + + mlog_entry_void(); + + new = ocfs2_iget(osb, osb->root_blkno); + if (IS_ERR(new)) { + status = PTR_ERR(new); + mlog_errno(status); + goto bail; + } + osb->root_inode = new; + + new = ocfs2_iget(osb, osb->system_dir_blkno); + if (IS_ERR(new)) { + status = PTR_ERR(new); + mlog_errno(status); + goto bail; + } + osb->sys_root_inode = new; + + for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE; + i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) { + new = ocfs2_get_system_file_inode(osb, i, osb->slot_num); + if (!new) { + ocfs2_release_system_inodes(osb); + status = -EINVAL; + mlog_errno(status); + /* FIXME: Should ERROR_RO_FS */ + mlog(ML_ERROR, "Unable to load system inode %d, " + "possibly corrupt fs?", i); + goto bail; + } + // the array now has one ref, so drop this one + iput(new); + } + +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb) +{ + struct inode *new = NULL; + int status = 0; + int i; + + mlog_entry_void(); + + for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1; + i < NUM_SYSTEM_INODES; + i++) { + new = ocfs2_get_system_file_inode(osb, i, osb->slot_num); + if (!new) { + ocfs2_release_system_inodes(osb); + status = -EINVAL; + mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n", + status, i, osb->slot_num); + goto bail; + } + /* the array now has one ref, so drop this one */ + iput(new); + } + +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_release_system_inodes(struct ocfs2_super *osb) +{ + int status = 0, i; + struct inode *inode; + + mlog_entry_void(); + + for (i = 0; i < NUM_SYSTEM_INODES; i++) { + inode = osb->system_inodes[i]; + if (inode) { + iput(inode); + osb->system_inodes[i] = NULL; + } + } + + inode = osb->sys_root_inode; + if (inode) { + iput(inode); + osb->sys_root_inode = NULL; + } + + inode = osb->root_inode; + if (inode) { + iput(inode); + osb->root_inode = NULL; + } + + mlog_exit(status); + return status; +} + +/* We're allocating fs objects, use GFP_NOFS */ +static struct inode *ocfs2_alloc_inode(struct super_block *sb) +{ + struct ocfs2_inode_info *oi; + + oi = kmem_cache_alloc(ocfs2_inode_cachep, SLAB_NOFS); + if (!oi) + return NULL; + + return &oi->vfs_inode; +} + +static void ocfs2_destroy_inode(struct inode *inode) +{ + kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode)); +} + +/* From xfs_super.c:xfs_max_file_offset + * Copyright (c) 2000-2004 Silicon Graphics, Inc. + */ +static unsigned long long ocfs2_max_file_offset(unsigned int blockshift) +{ + unsigned int pagefactor = 1; + unsigned int bitshift = BITS_PER_LONG - 1; + + /* Figure out maximum filesize, on Linux this can depend on + * the filesystem blocksize (on 32 bit platforms). + * __block_prepare_write does this in an [unsigned] long... + * page->index << (PAGE_CACHE_SHIFT - bbits) + * So, for page sized blocks (4K on 32 bit platforms), + * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is + * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) + * but for smaller blocksizes it is less (bbits = log2 bsize). + * Note1: get_block_t takes a long (implicit cast from above) + * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch + * can optionally convert the [unsigned] long from above into + * an [unsigned] long long. + */ + +#if BITS_PER_LONG == 32 +# if defined(CONFIG_LBD) + BUG_ON(sizeof(sector_t) != 8); + pagefactor = PAGE_CACHE_SIZE; + bitshift = BITS_PER_LONG; +# else + pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); +# endif +#endif + + return (((unsigned long long)pagefactor) << bitshift) - 1; +} + +static int ocfs2_remount(struct super_block *sb, int *flags, char *data) +{ + int incompat_features; + int ret = 0; + unsigned long parsed_options; + struct ocfs2_super *osb = OCFS2_SB(sb); + + if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) { + ret = -EINVAL; + goto out; + } + + if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) != + (parsed_options & OCFS2_MOUNT_HB_LOCAL)) { + ret = -EINVAL; + mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n"); + goto out; + } + + if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) != + (parsed_options & OCFS2_MOUNT_DATA_WRITEBACK)) { + ret = -EINVAL; + mlog(ML_ERROR, "Cannot change data mode on remount\n"); + goto out; + } + + /* We're going to/from readonly mode. */ + if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { + /* Lock here so the check of HARD_RO and the potential + * setting of SOFT_RO is atomic. */ + spin_lock(&osb->osb_lock); + if (osb->osb_flags & OCFS2_OSB_HARD_RO) { + mlog(ML_ERROR, "Remount on readonly device is forbidden.\n"); + ret = -EROFS; + goto unlock_osb; + } + + if (*flags & MS_RDONLY) { + mlog(0, "Going to ro mode.\n"); + sb->s_flags |= MS_RDONLY; + osb->osb_flags |= OCFS2_OSB_SOFT_RO; + } else { + mlog(0, "Making ro filesystem writeable.\n"); + + if (osb->osb_flags & OCFS2_OSB_ERROR_FS) { + mlog(ML_ERROR, "Cannot remount RDWR " + "filesystem due to previous errors.\n"); + ret = -EROFS; + goto unlock_osb; + } + incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP); + if (incompat_features) { + mlog(ML_ERROR, "Cannot remount RDWR because " + "of unsupported optional features " + "(%x).\n", incompat_features); + ret = -EINVAL; + goto unlock_osb; + } + sb->s_flags &= ~MS_RDONLY; + osb->osb_flags &= ~OCFS2_OSB_SOFT_RO; + } +unlock_osb: + spin_unlock(&osb->osb_lock); + } + + if (!ret) { + if (!ocfs2_is_hard_readonly(osb)) + ocfs2_set_journal_params(osb); + + /* Only save off the new mount options in case of a successful + * remount. */ + osb->s_mount_opt = parsed_options; + } +out: + return ret; +} + +static int ocfs2_sb_probe(struct super_block *sb, + struct buffer_head **bh, + int *sector_size) +{ + int status = 0, tmpstat; + struct ocfs1_vol_disk_hdr *hdr; + struct ocfs2_dinode *di; + int blksize; + + *bh = NULL; + + /* may be > 512 */ + *sector_size = bdev_hardsect_size(sb->s_bdev); + if (*sector_size > OCFS2_MAX_BLOCKSIZE) { + mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n", + *sector_size, OCFS2_MAX_BLOCKSIZE); + status = -EINVAL; + goto bail; + } + + /* Can this really happen? */ + if (*sector_size < OCFS2_MIN_BLOCKSIZE) + *sector_size = OCFS2_MIN_BLOCKSIZE; + + /* check block zero for old format */ + status = ocfs2_get_sector(sb, bh, 0, *sector_size); + if (status < 0) { + mlog_errno(status); + goto bail; + } + hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data; + if (hdr->major_version == OCFS1_MAJOR_VERSION) { + mlog(ML_ERROR, "incompatible version: %u.%u\n", + hdr->major_version, hdr->minor_version); + status = -EINVAL; + } + if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE, + strlen(OCFS1_VOLUME_SIGNATURE)) == 0) { + mlog(ML_ERROR, "incompatible volume signature: %8s\n", + hdr->signature); + status = -EINVAL; + } + brelse(*bh); + *bh = NULL; + if (status < 0) { + mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be " + "upgraded before mounting with ocfs v2\n"); + goto bail; + } + + /* + * Now check at magic offset for 512, 1024, 2048, 4096 + * blocksizes. 4096 is the maximum blocksize because it is + * the minimum clustersize. + */ + status = -EINVAL; + for (blksize = *sector_size; + blksize <= OCFS2_MAX_BLOCKSIZE; + blksize <<= 1) { + tmpstat = ocfs2_get_sector(sb, bh, + OCFS2_SUPER_BLOCK_BLKNO, + blksize); + if (tmpstat < 0) { + status = tmpstat; + mlog_errno(status); + goto bail; + } + di = (struct ocfs2_dinode *) (*bh)->b_data; + status = ocfs2_verify_volume(di, *bh, blksize); + if (status >= 0) + goto bail; + brelse(*bh); + *bh = NULL; + if (status != -EAGAIN) + break; + } + +bail: + return status; +} + +static int ocfs2_fill_super(struct super_block *sb, void *data, int silent) +{ + struct dentry *root; + int status, sector_size; + unsigned long parsed_opt; + struct inode *inode = NULL; + struct ocfs2_super *osb = NULL; + struct buffer_head *bh = NULL; + + mlog_entry("%p, %p, %i", sb, data, silent); + + /* for now we only have one cluster/node, make sure we see it + * in the heartbeat universe */ + if (!o2hb_check_local_node_heartbeating()) { + status = -EINVAL; + goto read_super_error; + } + + /* probe for superblock */ + status = ocfs2_sb_probe(sb, &bh, §or_size); + if (status < 0) { + mlog(ML_ERROR, "superblock probe failed!\n"); + goto read_super_error; + } + + status = ocfs2_initialize_super(sb, bh, sector_size); + osb = OCFS2_SB(sb); + if (status < 0) { + mlog_errno(status); + goto read_super_error; + } + brelse(bh); + bh = NULL; + + if (!ocfs2_parse_options(sb, data, &parsed_opt, 0)) { + status = -EINVAL; + goto read_super_error; + } + osb->s_mount_opt = parsed_opt; + + sb->s_magic = OCFS2_SUPER_MAGIC; + + /* Hard readonly mode only if: bdev_read_only, MS_RDONLY, + * heartbeat=none */ + if (bdev_read_only(sb->s_bdev)) { + if (!(sb->s_flags & MS_RDONLY)) { + status = -EACCES; + mlog(ML_ERROR, "Readonly device detected but readonly " + "mount was not specified.\n"); + goto read_super_error; + } + + /* You should not be able to start a local heartbeat + * on a readonly device. */ + if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) { + status = -EROFS; + mlog(ML_ERROR, "Local heartbeat specified on readonly " + "device.\n"); + goto read_super_error; + } + + status = ocfs2_check_journals_nolocks(osb); + if (status < 0) { + if (status == -EROFS) + mlog(ML_ERROR, "Recovery required on readonly " + "file system, but write access is " + "unavailable.\n"); + else + mlog_errno(status); + goto read_super_error; + } + + ocfs2_set_ro_flag(osb, 1); + + printk(KERN_NOTICE "Readonly device detected. No cluster " + "services will be utilized for this mount. Recovery " + "will be skipped.\n"); + } + + if (!ocfs2_is_hard_readonly(osb)) { + /* If this isn't a hard readonly mount, then we need + * to make sure that heartbeat is in a valid state, + * and that we mark ourselves soft readonly is -oro + * was specified. */ + if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) { + mlog(ML_ERROR, "No heartbeat for device (%s)\n", + sb->s_id); + status = -EINVAL; + goto read_super_error; + } + + if (sb->s_flags & MS_RDONLY) + ocfs2_set_ro_flag(osb, 0); + } + + osb->osb_debug_root = debugfs_create_dir(osb->uuid_str, + ocfs2_debugfs_root); + if (!osb->osb_debug_root) { + status = -EINVAL; + mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n"); + goto read_super_error; + } + + status = ocfs2_mount_volume(sb); + if (osb->root_inode) + inode = igrab(osb->root_inode); + + if (status < 0) + goto read_super_error; + + if (!inode) { + status = -EIO; + mlog_errno(status); + goto read_super_error; + } + + root = d_alloc_root(inode); + if (!root) { + status = -ENOMEM; + mlog_errno(status); + goto read_super_error; + } + + sb->s_root = root; + + ocfs2_complete_mount_recovery(osb); + + printk("ocfs2: Mounting device (%u,%u) on (node %d, slot %d) with %s " + "data mode.\n", + MAJOR(sb->s_dev), MINOR(sb->s_dev), osb->node_num, + osb->slot_num, + osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" : + "ordered"); + + atomic_set(&osb->vol_state, VOLUME_MOUNTED); + wake_up(&osb->osb_mount_event); + + mlog_exit(status); + return status; + +read_super_error: + if (bh != NULL) + brelse(bh); + + if (inode) + iput(inode); + + if (osb) { + atomic_set(&osb->vol_state, VOLUME_DISABLED); + wake_up(&osb->osb_mount_event); + ocfs2_dismount_volume(sb, 1); + } + + mlog_exit(status); + return status; +} + +static struct super_block *ocfs2_get_sb(struct file_system_type *fs_type, + int flags, + const char *dev_name, + void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super); +} + +static struct file_system_type ocfs2_fs_type = { + .owner = THIS_MODULE, + .name = "ocfs2", + .get_sb = ocfs2_get_sb, /* is this called when we mount + * the fs? */ + .kill_sb = kill_block_super, /* set to the generic one + * right now, but do we + * need to change that? */ + .fs_flags = FS_REQUIRES_DEV, + .next = NULL +}; + +static int ocfs2_parse_options(struct super_block *sb, + char *options, + unsigned long *mount_opt, + int is_remount) +{ + int status; + char *p; + + mlog_entry("remount: %d, options: \"%s\"\n", is_remount, + options ? options : "(none)"); + + *mount_opt = 0; + + if (!options) { + status = 1; + goto bail; + } + + while ((p = strsep(&options, ",")) != NULL) { + int token, option; + substring_t args[MAX_OPT_ARGS]; + + if (!*p) + continue; + + token = match_token(p, tokens, args); + switch (token) { + case Opt_hb_local: + *mount_opt |= OCFS2_MOUNT_HB_LOCAL; + break; + case Opt_hb_none: + *mount_opt &= ~OCFS2_MOUNT_HB_LOCAL; + break; + case Opt_barrier: + if (match_int(&args[0], &option)) { + status = 0; + goto bail; + } + if (option) + *mount_opt |= OCFS2_MOUNT_BARRIER; + else + *mount_opt &= ~OCFS2_MOUNT_BARRIER; + break; + case Opt_intr: + *mount_opt &= ~OCFS2_MOUNT_NOINTR; + break; + case Opt_nointr: + *mount_opt |= OCFS2_MOUNT_NOINTR; + break; + case Opt_err_panic: + *mount_opt |= OCFS2_MOUNT_ERRORS_PANIC; + break; + case Opt_err_ro: + *mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC; + break; + case Opt_data_ordered: + *mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK; + break; + case Opt_data_writeback: + *mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK; + break; + default: + mlog(ML_ERROR, + "Unrecognized mount option \"%s\" " + "or missing value\n", p); + status = 0; + goto bail; + } + } + + status = 1; + +bail: + mlog_exit(status); + return status; +} + +static int __init ocfs2_init(void) +{ + int status; + + mlog_entry_void(); + + ocfs2_print_version(); + + if (init_ocfs2_extent_maps()) + return -ENOMEM; + + status = init_ocfs2_uptodate_cache(); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_initialize_mem_caches(); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + ocfs2_wq = create_singlethread_workqueue("ocfs2_wq"); + if (!ocfs2_wq) { + status = -ENOMEM; + goto leave; + } + + spin_lock(&ocfs2_globals_lock); + osb_id = 0; + spin_unlock(&ocfs2_globals_lock); + + ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL); + if (!ocfs2_debugfs_root) { + status = -EFAULT; + mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n"); + } + +leave: + if (status < 0) { + ocfs2_free_mem_caches(); + exit_ocfs2_uptodate_cache(); + exit_ocfs2_extent_maps(); + } + + mlog_exit(status); + + if (status >= 0) { + return register_filesystem(&ocfs2_fs_type); + } else + return -1; +} + +static void __exit ocfs2_exit(void) +{ + mlog_entry_void(); + + if (ocfs2_wq) { + flush_workqueue(ocfs2_wq); + destroy_workqueue(ocfs2_wq); + } + + debugfs_remove(ocfs2_debugfs_root); + + ocfs2_free_mem_caches(); + + unregister_filesystem(&ocfs2_fs_type); + + exit_ocfs2_extent_maps(); + + exit_ocfs2_uptodate_cache(); + + mlog_exit_void(); +} + +static void ocfs2_put_super(struct super_block *sb) +{ + mlog_entry("(0x%p)\n", sb); + + ocfs2_sync_blockdev(sb); + ocfs2_dismount_volume(sb, 0); + + mlog_exit_void(); +} + +static int ocfs2_statfs(struct super_block *sb, struct kstatfs *buf) +{ + struct ocfs2_super *osb; + u32 numbits, freebits; + int status; + struct ocfs2_dinode *bm_lock; + struct buffer_head *bh = NULL; + struct inode *inode = NULL; + + mlog_entry("(%p, %p)\n", sb, buf); + + osb = OCFS2_SB(sb); + + inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!inode) { + mlog(ML_ERROR, "failed to get bitmap inode\n"); + status = -EIO; + goto bail; + } + + status = ocfs2_meta_lock(inode, NULL, &bh, 0); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + bm_lock = (struct ocfs2_dinode *) bh->b_data; + + numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total); + freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used); + + buf->f_type = OCFS2_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_namelen = OCFS2_MAX_FILENAME_LEN; + buf->f_blocks = ((sector_t) numbits) * + (osb->s_clustersize >> osb->sb->s_blocksize_bits); + buf->f_bfree = ((sector_t) freebits) * + (osb->s_clustersize >> osb->sb->s_blocksize_bits); + buf->f_bavail = buf->f_bfree; + buf->f_files = numbits; + buf->f_ffree = freebits; + + brelse(bh); + + ocfs2_meta_unlock(inode, 0); + status = 0; +bail: + if (inode) + iput(inode); + + mlog_exit(status); + + return status; +} + +static void ocfs2_inode_init_once(void *data, + kmem_cache_t *cachep, + unsigned long flags) +{ + struct ocfs2_inode_info *oi = data; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) { + oi->ip_flags = 0; + oi->ip_open_count = 0; + spin_lock_init(&oi->ip_lock); + ocfs2_extent_map_init(&oi->vfs_inode); + INIT_LIST_HEAD(&oi->ip_handle_list); + INIT_LIST_HEAD(&oi->ip_io_markers); + oi->ip_handle = NULL; + oi->ip_created_trans = 0; + oi->ip_last_trans = 0; + oi->ip_dir_start_lookup = 0; + + init_rwsem(&oi->ip_alloc_sem); + init_MUTEX(&(oi->ip_io_sem)); + + oi->ip_blkno = 0ULL; + oi->ip_clusters = 0; + + ocfs2_lock_res_init_once(&oi->ip_rw_lockres); + ocfs2_lock_res_init_once(&oi->ip_meta_lockres); + ocfs2_lock_res_init_once(&oi->ip_data_lockres); + + ocfs2_metadata_cache_init(&oi->vfs_inode); + + inode_init_once(&oi->vfs_inode); + } +} + +static int ocfs2_initialize_mem_caches(void) +{ + ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache", + sizeof(struct ocfs2_inode_info), + 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, + ocfs2_inode_init_once, NULL); + if (!ocfs2_inode_cachep) + return -ENOMEM; + + ocfs2_lock_cache = kmem_cache_create("ocfs2_lock", + sizeof(struct ocfs2_journal_lock), + 0, + SLAB_NO_REAP|SLAB_HWCACHE_ALIGN, + NULL, NULL); + if (!ocfs2_lock_cache) + return -ENOMEM; + + return 0; +} + +static void ocfs2_free_mem_caches(void) +{ + if (ocfs2_inode_cachep) + kmem_cache_destroy(ocfs2_inode_cachep); + if (ocfs2_lock_cache) + kmem_cache_destroy(ocfs2_lock_cache); + + ocfs2_inode_cachep = NULL; + ocfs2_lock_cache = NULL; +} + +static int ocfs2_get_sector(struct super_block *sb, + struct buffer_head **bh, + int block, + int sect_size) +{ + if (!sb_set_blocksize(sb, sect_size)) { + mlog(ML_ERROR, "unable to set blocksize\n"); + return -EIO; + } + + *bh = sb_getblk(sb, block); + if (!*bh) { + mlog_errno(-EIO); + return -EIO; + } + lock_buffer(*bh); + if (!buffer_dirty(*bh)) + clear_buffer_uptodate(*bh); + unlock_buffer(*bh); + ll_rw_block(READ, 1, bh); + wait_on_buffer(*bh); + return 0; +} + +/* ocfs2 1.0 only allows one cluster and node identity per kernel image. */ +static int ocfs2_fill_local_node_info(struct ocfs2_super *osb) +{ + int status; + + /* XXX hold a ref on the node while mounte? easy enough, if + * desirable. */ + osb->node_num = o2nm_this_node(); + if (osb->node_num == O2NM_MAX_NODES) { + mlog(ML_ERROR, "could not find this host's node number\n"); + status = -ENOENT; + goto bail; + } + + mlog(ML_NOTICE, "I am node %d\n", osb->node_num); + + status = 0; +bail: + return status; +} + +static int ocfs2_mount_volume(struct super_block *sb) +{ + int status = 0; + int unlock_super = 0; + struct ocfs2_super *osb = OCFS2_SB(sb); + + mlog_entry_void(); + + if (ocfs2_is_hard_readonly(osb)) + goto leave; + + status = ocfs2_fill_local_node_info(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_register_hb_callbacks(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_dlm_init(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* requires vote_thread to be running. */ + status = ocfs2_register_net_handlers(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_super_lock(osb, 1); + if (status < 0) { + mlog_errno(status); + goto leave; + } + unlock_super = 1; + + /* This will load up the node map and add ourselves to it. */ + status = ocfs2_find_slot(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + ocfs2_populate_mounted_map(osb); + + /* load all node-local system inodes */ + status = ocfs2_init_local_system_inodes(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_check_volume(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_truncate_log_init(osb); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* This should be sent *after* we recovered our journal as it + * will cause other nodes to unmark us as needing + * recovery. However, we need to send it *before* dropping the + * super block lock as otherwise their recovery threads might + * try to clean us up while we're live! */ + status = ocfs2_request_mount_vote(osb); + if (status < 0) + mlog_errno(status); + +leave: + if (unlock_super) + ocfs2_super_unlock(osb, 1); + + mlog_exit(status); + return status; +} + +/* we can't grab the goofy sem lock from inside wait_event, so we use + * memory barriers to make sure that we'll see the null task before + * being woken up */ +static int ocfs2_recovery_thread_running(struct ocfs2_super *osb) +{ + mb(); + return osb->recovery_thread_task != NULL; +} + +static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) +{ + int tmp; + struct ocfs2_super *osb = NULL; + + mlog_entry("(0x%p)\n", sb); + + BUG_ON(!sb); + osb = OCFS2_SB(sb); + BUG_ON(!osb); + + ocfs2_shutdown_local_alloc(osb); + + ocfs2_truncate_log_shutdown(osb); + + /* disable any new recovery threads and wait for any currently + * running ones to exit. Do this before setting the vol_state. */ + down(&osb->recovery_lock); + osb->disable_recovery = 1; + up(&osb->recovery_lock); + wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb)); + + /* At this point, we know that no more recovery threads can be + * launched, so wait for any recovery completion work to + * complete. */ + flush_workqueue(ocfs2_wq); + + ocfs2_journal_shutdown(osb); + + ocfs2_sync_blockdev(sb); + + /* No dlm means we've failed during mount, so skip all the + * steps which depended on that to complete. */ + if (osb->dlm) { + tmp = ocfs2_super_lock(osb, 1); + if (tmp < 0) { + mlog_errno(tmp); + return; + } + + tmp = ocfs2_request_umount_vote(osb); + if (tmp < 0) + mlog_errno(tmp); + + if (osb->slot_num != OCFS2_INVALID_SLOT) + ocfs2_put_slot(osb); + + ocfs2_super_unlock(osb, 1); + } + + ocfs2_release_system_inodes(osb); + + if (osb->dlm) { + ocfs2_unregister_net_handlers(osb); + + ocfs2_dlm_shutdown(osb); + } + + ocfs2_clear_hb_callbacks(osb); + + debugfs_remove(osb->osb_debug_root); + + if (!mnt_err) + ocfs2_stop_heartbeat(osb); + + atomic_set(&osb->vol_state, VOLUME_DISMOUNTED); + + printk("ocfs2: Unmounting device (%u,%u) on (node %d)\n", + MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev), osb->node_num); + + ocfs2_delete_osb(osb); + kfree(osb); + sb->s_dev = 0; + sb->s_fs_info = NULL; +} + +static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid, + unsigned uuid_bytes) +{ + int i, ret; + char *ptr; + + BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN); + + osb->uuid_str = kcalloc(1, OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL); + if (osb->uuid_str == NULL) + return -ENOMEM; + + memcpy(osb->uuid, uuid, OCFS2_VOL_UUID_LEN); + + for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) { + /* print with null */ + ret = snprintf(ptr, 3, "%02X", uuid[i]); + if (ret != 2) /* drop super cleans up */ + return -EINVAL; + /* then only advance past the last char */ + ptr += 2; + } + + return 0; +} + +static int ocfs2_initialize_super(struct super_block *sb, + struct buffer_head *bh, + int sector_size) +{ + int status = 0; + int i; + struct ocfs2_dinode *di = NULL; + struct inode *inode = NULL; + struct buffer_head *bitmap_bh = NULL; + struct ocfs2_journal *journal; + __le32 uuid_net_key; + struct ocfs2_super *osb; + + mlog_entry_void(); + + osb = kcalloc(1, sizeof(struct ocfs2_super), GFP_KERNEL); + if (!osb) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + sb->s_fs_info = osb; + sb->s_op = &ocfs2_sops; + sb->s_export_op = &ocfs2_export_ops; + sb->s_flags |= MS_NOATIME; + /* this is needed to support O_LARGEFILE */ + sb->s_maxbytes = ocfs2_max_file_offset(sb->s_blocksize_bits); + + osb->sb = sb; + /* Save off for ocfs2_rw_direct */ + osb->s_sectsize_bits = blksize_bits(sector_size); + if (!osb->s_sectsize_bits) + BUG(); + + osb->net_response_ids = 0; + spin_lock_init(&osb->net_response_lock); + INIT_LIST_HEAD(&osb->net_response_list); + + INIT_LIST_HEAD(&osb->osb_net_handlers); + init_waitqueue_head(&osb->recovery_event); + spin_lock_init(&osb->vote_task_lock); + init_waitqueue_head(&osb->vote_event); + osb->vote_work_sequence = 0; + osb->vote_wake_sequence = 0; + INIT_LIST_HEAD(&osb->blocked_lock_list); + osb->blocked_lock_count = 0; + INIT_LIST_HEAD(&osb->vote_list); + spin_lock_init(&osb->osb_lock); + + atomic_set(&osb->alloc_stats.moves, 0); + atomic_set(&osb->alloc_stats.local_data, 0); + atomic_set(&osb->alloc_stats.bitmap_data, 0); + atomic_set(&osb->alloc_stats.bg_allocs, 0); + atomic_set(&osb->alloc_stats.bg_extends, 0); + + ocfs2_init_node_maps(osb); + + snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u", + MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev)); + + init_MUTEX(&osb->recovery_lock); + + osb->disable_recovery = 0; + osb->recovery_thread_task = NULL; + + init_waitqueue_head(&osb->checkpoint_event); + atomic_set(&osb->needs_checkpoint, 0); + + osb->node_num = O2NM_INVALID_NODE_NUM; + osb->slot_num = OCFS2_INVALID_SLOT; + + osb->local_alloc_state = OCFS2_LA_UNUSED; + osb->local_alloc_bh = NULL; + + ocfs2_setup_hb_callbacks(osb); + + init_waitqueue_head(&osb->osb_mount_event); + + osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL); + if (!osb->vol_label) { + mlog(ML_ERROR, "unable to alloc vol label\n"); + status = -ENOMEM; + goto bail; + } + + osb->uuid = kmalloc(OCFS2_VOL_UUID_LEN, GFP_KERNEL); + if (!osb->uuid) { + mlog(ML_ERROR, "unable to alloc uuid\n"); + status = -ENOMEM; + goto bail; + } + + di = (struct ocfs2_dinode *)bh->b_data; + + osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots); + if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) { + mlog(ML_ERROR, "Invalid number of node slots (%u)\n", + osb->max_slots); + status = -EINVAL; + goto bail; + } + mlog(ML_NOTICE, "max_slots for this device: %u\n", osb->max_slots); + + osb->s_feature_compat = + le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat); + osb->s_feature_ro_compat = + le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat); + osb->s_feature_incompat = + le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat); + + if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) { + mlog(ML_ERROR, "couldn't mount because of unsupported " + "optional features (%x).\n", i); + status = -EINVAL; + goto bail; + } + if (!(osb->sb->s_flags & MS_RDONLY) && + (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) { + mlog(ML_ERROR, "couldn't mount RDWR because of " + "unsupported optional features (%x).\n", i); + status = -EINVAL; + goto bail; + } + + get_random_bytes(&osb->s_next_generation, sizeof(u32)); + + /* FIXME + * This should be done in ocfs2_journal_init(), but unknown + * ordering issues will cause the filesystem to crash. + * If anyone wants to figure out what part of the code + * refers to osb->journal before ocfs2_journal_init() is run, + * be my guest. + */ + /* initialize our journal structure */ + + journal = kcalloc(1, sizeof(struct ocfs2_journal), GFP_KERNEL); + if (!journal) { + mlog(ML_ERROR, "unable to alloc journal\n"); + status = -ENOMEM; + goto bail; + } + osb->journal = journal; + journal->j_osb = osb; + + atomic_set(&journal->j_num_trans, 0); + init_rwsem(&journal->j_trans_barrier); + init_waitqueue_head(&journal->j_checkpointed); + spin_lock_init(&journal->j_lock); + journal->j_trans_id = (unsigned long) 1; + INIT_LIST_HEAD(&journal->j_la_cleanups); + INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery, osb); + journal->j_state = OCFS2_JOURNAL_FREE; + + /* get some pseudo constants for clustersize bits */ + osb->s_clustersize_bits = + le32_to_cpu(di->id2.i_super.s_clustersize_bits); + osb->s_clustersize = 1 << osb->s_clustersize_bits; + mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits); + + if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE || + osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) { + mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n", + osb->s_clustersize); + status = -EINVAL; + goto bail; + } + + if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1) + > (u32)~0UL) { + mlog(ML_ERROR, "Volume might try to write to blocks beyond " + "what jbd can address in 32 bits.\n"); + status = -EINVAL; + goto bail; + } + + if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid, + sizeof(di->id2.i_super.s_uuid))) { + mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n"); + status = -ENOMEM; + goto bail; + } + + memcpy(&uuid_net_key, &osb->uuid[i], sizeof(osb->net_key)); + osb->net_key = le32_to_cpu(uuid_net_key); + + strncpy(osb->vol_label, di->id2.i_super.s_label, 63); + osb->vol_label[63] = '\0'; + osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno); + osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno); + osb->first_cluster_group_blkno = + le64_to_cpu(di->id2.i_super.s_first_cluster_group); + osb->fs_generation = le32_to_cpu(di->i_fs_generation); + mlog(0, "vol_label: %s\n", osb->vol_label); + mlog(0, "uuid: %s\n", osb->uuid_str); + mlog(0, "root_blkno=%"MLFu64", system_dir_blkno=%"MLFu64"\n", + osb->root_blkno, osb->system_dir_blkno); + + osb->osb_dlm_debug = ocfs2_new_dlm_debug(); + if (!osb->osb_dlm_debug) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + atomic_set(&osb->vol_state, VOLUME_INIT); + + /* load root, system_dir, and all global system inodes */ + status = ocfs2_init_global_system_inodes(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* + * global bitmap + */ + inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!inode) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno; + + status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0, + inode); + iput(inode); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + di = (struct ocfs2_dinode *) bitmap_bh->b_data; + osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg); + osb->num_clusters = le32_to_cpu(di->id1.bitmap1.i_total); + brelse(bitmap_bh); + mlog(0, "cluster bitmap inode: %"MLFu64", clusters per group: %u\n", + osb->bitmap_blkno, osb->bitmap_cpg); + + status = ocfs2_init_slot_info(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* Link this osb onto the global linked list of all osb structures. */ + /* The Global Link List is mainted for the whole driver . */ + spin_lock(&ocfs2_globals_lock); + osb->osb_id = osb_id; + if (osb_id < OCFS2_MAX_OSB_ID) + osb_id++; + else { + mlog(ML_ERROR, "Too many volumes mounted\n"); + status = -ENOMEM; + } + spin_unlock(&ocfs2_globals_lock); + +bail: + mlog_exit(status); + return status; +} + +/* + * will return: -EAGAIN if it is ok to keep searching for superblocks + * -EINVAL if there is a bad superblock + * 0 on success + */ +static int ocfs2_verify_volume(struct ocfs2_dinode *di, + struct buffer_head *bh, + u32 blksz) +{ + int status = -EAGAIN; + + mlog_entry_void(); + + if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE, + strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) { + status = -EINVAL; + if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) { + mlog(ML_ERROR, "found superblock with incorrect block " + "size: found %u, should be %u\n", + 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits), + blksz); + } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) != + OCFS2_MAJOR_REV_LEVEL || + le16_to_cpu(di->id2.i_super.s_minor_rev_level) != + OCFS2_MINOR_REV_LEVEL) { + mlog(ML_ERROR, "found superblock with bad version: " + "found %u.%u, should be %u.%u\n", + le16_to_cpu(di->id2.i_super.s_major_rev_level), + le16_to_cpu(di->id2.i_super.s_minor_rev_level), + OCFS2_MAJOR_REV_LEVEL, + OCFS2_MINOR_REV_LEVEL); + } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) { + mlog(ML_ERROR, "bad block number on superblock: " + "found %"MLFu64", should be %llu\n", + di->i_blkno, (unsigned long long)bh->b_blocknr); + } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 || + le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) { + mlog(ML_ERROR, "bad cluster size found: %u\n", + 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits)); + } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) { + mlog(ML_ERROR, "bad root_blkno: 0\n"); + } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) { + mlog(ML_ERROR, "bad system_dir_blkno: 0\n"); + } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) { + mlog(ML_ERROR, + "Superblock slots found greater than file system " + "maximum: found %u, max %u\n", + le16_to_cpu(di->id2.i_super.s_max_slots), + OCFS2_MAX_SLOTS); + } else { + /* found it! */ + status = 0; + } + } + + mlog_exit(status); + return status; +} + +static int ocfs2_check_volume(struct ocfs2_super *osb) +{ + int status = 0; + int dirty; + struct ocfs2_dinode *local_alloc = NULL; /* only used if we + * recover + * ourselves. */ + + mlog_entry_void(); + + /* Init our journal object. */ + status = ocfs2_journal_init(osb->journal, &dirty); + if (status < 0) { + mlog(ML_ERROR, "Could not initialize journal!\n"); + goto finally; + } + + /* If the journal was unmounted cleanly then we don't want to + * recover anything. Otherwise, journal_load will do that + * dirty work for us :) */ + if (!dirty) { + status = ocfs2_journal_wipe(osb->journal, 0); + if (status < 0) { + mlog_errno(status); + goto finally; + } + } else { + mlog(ML_NOTICE, "File system was not unmounted cleanly, " + "recovering volume.\n"); + } + + /* will play back anything left in the journal. */ + ocfs2_journal_load(osb->journal); + + if (dirty) { + /* recover my local alloc if we didn't unmount cleanly. */ + status = ocfs2_begin_local_alloc_recovery(osb, + osb->slot_num, + &local_alloc); + if (status < 0) { + mlog_errno(status); + goto finally; + } + /* we complete the recovery process after we've marked + * ourselves as mounted. */ + } + + mlog(0, "Journal loaded.\n"); + + status = ocfs2_load_local_alloc(osb); + if (status < 0) { + mlog_errno(status); + goto finally; + } + + if (dirty) { + /* Recovery will be completed after we've mounted the + * rest of the volume. */ + osb->dirty = 1; + osb->local_alloc_copy = local_alloc; + local_alloc = NULL; + } + + /* go through each journal, trylock it and if you get the + * lock, and it's marked as dirty, set the bit in the recover + * map and launch a recovery thread for it. */ + status = ocfs2_mark_dead_nodes(osb); + if (status < 0) + mlog_errno(status); + +finally: + if (local_alloc) + kfree(local_alloc); + + mlog_exit(status); + return status; +} + +/* + * The routine gets called from dismount or close whenever a dismount on + * volume is requested and the osb open count becomes 1. + * It will remove the osb from the global list and also free up all the + * initialized resources and fileobject. + */ +static void ocfs2_delete_osb(struct ocfs2_super *osb) +{ + mlog_entry_void(); + + /* This function assumes that the caller has the main osb resource */ + + if (osb->slot_info) + ocfs2_free_slot_info(osb->slot_info); + + /* FIXME + * This belongs in journal shutdown, but because we have to + * allocate osb->journal at the start of ocfs2_initalize_osb(), + * we free it here. + */ + kfree(osb->journal); + if (osb->local_alloc_copy) + kfree(osb->local_alloc_copy); + kfree(osb->uuid_str); + ocfs2_put_dlm_debug(osb->osb_dlm_debug); + memset(osb, 0, sizeof(struct ocfs2_super)); + + mlog_exit_void(); +} + +/* Put OCFS2 into a readonly state, or (if the user specifies it), + * panic(). We do not support continue-on-error operation. */ +static void ocfs2_handle_error(struct super_block *sb) +{ + struct ocfs2_super *osb = OCFS2_SB(sb); + + if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) + panic("OCFS2: (device %s): panic forced after error\n", + sb->s_id); + + ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS); + + if (sb->s_flags & MS_RDONLY && + (ocfs2_is_soft_readonly(osb) || + ocfs2_is_hard_readonly(osb))) + return; + + printk(KERN_CRIT "File system is now read-only due to the potential " + "of on-disk corruption. Please run fsck.ocfs2 once the file " + "system is unmounted.\n"); + sb->s_flags |= MS_RDONLY; + ocfs2_set_ro_flag(osb, 0); +} + +static char error_buf[1024]; + +void __ocfs2_error(struct super_block *sb, + const char *function, + const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vsprintf(error_buf, fmt, args); + va_end(args); + + /* Not using mlog here because we want to show the actual + * function the error came from. */ + printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n", + sb->s_id, function, error_buf); + + ocfs2_handle_error(sb); +} + +/* Handle critical errors. This is intentionally more drastic than + * ocfs2_handle_error, so we only use for things like journal errors, + * etc. */ +void __ocfs2_abort(struct super_block* sb, + const char *function, + const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vsprintf(error_buf, fmt, args); + va_end(args); + + printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n", + sb->s_id, function, error_buf); + + /* We don't have the cluster support yet to go straight to + * hard readonly in here. Until then, we want to keep + * ocfs2_abort() so that we can at least mark critical + * errors. + * + * TODO: This should abort the journal and alert other nodes + * that our slot needs recovery. */ + + /* Force a panic(). This stinks, but it's better than letting + * things continue without having a proper hard readonly + * here. */ + OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC; + ocfs2_handle_error(sb); +} + +module_init(ocfs2_init); +module_exit(ocfs2_exit); diff --git a/fs/ocfs2/super.h b/fs/ocfs2/super.h new file mode 100644 index 0000000..c564177 --- /dev/null +++ b/fs/ocfs2/super.h @@ -0,0 +1,44 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * super.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_SUPER_H +#define OCFS2_SUPER_H + +extern struct workqueue_struct *ocfs2_wq; + +int ocfs2_publish_get_mount_state(struct ocfs2_super *osb, + int node_num); + +void __ocfs2_error(struct super_block *sb, + const char *function, + const char *fmt, ...); +#define ocfs2_error(sb, fmt, args...) __ocfs2_error(sb, __PRETTY_FUNCTION__, fmt, ##args) + +void __ocfs2_abort(struct super_block *sb, + const char *function, + const char *fmt, ...); +#define ocfs2_abort(sb, fmt, args...) __ocfs2_abort(sb, __PRETTY_FUNCTION__, fmt, ##args) + +#endif /* OCFS2_SUPER_H */ diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c new file mode 100644 index 0000000..f6986bd --- /dev/null +++ b/fs/ocfs2/symlink.c @@ -0,0 +1,180 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * linux/cluster/ssi/cfs/symlink.c + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE + * or NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net + * + * Copyright (C) 1992 Rick Sladkey + * + * Optimization changes Copyright (C) 1994 Florian La Roche + * + * Jun 7 1999, cache symlink lookups in the page cache. -DaveM + * + * Portions Copyright (C) 2001 Compaq Computer Corporation + * + * ocfs2 symlink handling code. + * + * Copyright (C) 2004, 2005 Oracle. + * + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <linux/utsname.h> + +#define MLOG_MASK_PREFIX ML_NAMEI +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "symlink.h" + +#include "buffer_head_io.h" + +static char *ocfs2_page_getlink(struct dentry * dentry, + struct page **ppage); +static char *ocfs2_fast_symlink_getlink(struct inode *inode, + struct buffer_head **bh); + +/* get the link contents into pagecache */ +static char *ocfs2_page_getlink(struct dentry * dentry, + struct page **ppage) +{ + struct page * page; + struct address_space *mapping = dentry->d_inode->i_mapping; + page = read_cache_page(mapping, 0, + (filler_t *)mapping->a_ops->readpage, NULL); + if (IS_ERR(page)) + goto sync_fail; + wait_on_page_locked(page); + if (!PageUptodate(page)) + goto async_fail; + *ppage = page; + return kmap(page); + +async_fail: + page_cache_release(page); + return ERR_PTR(-EIO); + +sync_fail: + return (char*)page; +} + +static char *ocfs2_fast_symlink_getlink(struct inode *inode, + struct buffer_head **bh) +{ + int status; + char *link = NULL; + struct ocfs2_dinode *fe; + + mlog_entry_void(); + + status = ocfs2_read_block(OCFS2_SB(inode->i_sb), + OCFS2_I(inode)->ip_blkno, + bh, + OCFS2_BH_CACHED, + inode); + if (status < 0) { + mlog_errno(status); + link = ERR_PTR(status); + goto bail; + } + + fe = (struct ocfs2_dinode *) (*bh)->b_data; + link = (char *) fe->id2.i_symlink; +bail: + mlog_exit(status); + + return link; +} + +static int ocfs2_readlink(struct dentry *dentry, + char __user *buffer, + int buflen) +{ + int ret; + char *link; + struct buffer_head *bh = NULL; + struct inode *inode = dentry->d_inode; + + mlog_entry_void(); + + link = ocfs2_fast_symlink_getlink(inode, &bh); + if (IS_ERR(link)) { + ret = PTR_ERR(link); + goto out; + } + + ret = vfs_readlink(dentry, buffer, buflen, link); + + brelse(bh); +out: + mlog_exit(ret); + return ret; +} + +static void *ocfs2_follow_link(struct dentry *dentry, + struct nameidata *nd) +{ + int status; + char *link; + struct inode *inode = dentry->d_inode; + struct page *page = NULL; + struct buffer_head *bh = NULL; + + if (ocfs2_inode_is_fast_symlink(inode)) + link = ocfs2_fast_symlink_getlink(inode, &bh); + else + link = ocfs2_page_getlink(dentry, &page); + if (IS_ERR(link)) { + status = PTR_ERR(link); + mlog_errno(status); + goto bail; + } + + status = vfs_follow_link(nd, link); + if (status) + mlog_errno(status); +bail: + if (page) { + kunmap(page); + page_cache_release(page); + } + if (bh) + brelse(bh); + + return ERR_PTR(status); +} + +struct inode_operations ocfs2_symlink_inode_operations = { + .readlink = page_readlink, + .follow_link = ocfs2_follow_link, + .getattr = ocfs2_getattr, +}; +struct inode_operations ocfs2_fast_symlink_inode_operations = { + .readlink = ocfs2_readlink, + .follow_link = ocfs2_follow_link, + .getattr = ocfs2_getattr, +}; diff --git a/fs/ocfs2/symlink.h b/fs/ocfs2/symlink.h new file mode 100644 index 0000000..1ea9e4d --- /dev/null +++ b/fs/ocfs2/symlink.h @@ -0,0 +1,42 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * symlink.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_SYMLINK_H +#define OCFS2_SYMLINK_H + +extern struct inode_operations ocfs2_symlink_inode_operations; +extern struct inode_operations ocfs2_fast_symlink_inode_operations; + +/* + * Test whether an inode is a fast symlink. + */ +static inline int ocfs2_inode_is_fast_symlink(struct inode *inode) +{ + return (S_ISLNK(inode->i_mode) && + inode->i_blocks == 0); +} + + +#endif /* OCFS2_SYMLINK_H */ diff --git a/fs/ocfs2/sysfile.c b/fs/ocfs2/sysfile.c new file mode 100644 index 0000000..600a8bc5 --- /dev/null +++ b/fs/ocfs2/sysfile.c @@ -0,0 +1,131 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * sysfile.c + * + * Initialize, read, write, etc. system files. + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#include "ocfs2.h" + +#define MLOG_MASK_PREFIX ML_INODE +#include <cluster/masklog.h> + +#include "alloc.h" +#include "dir.h" +#include "inode.h" +#include "journal.h" +#include "sysfile.h" + +#include "buffer_head_io.h" + +static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, + int type, + u32 slot); + +static inline int is_global_system_inode(int type); +static inline int is_in_system_inode_array(struct ocfs2_super *osb, + int type, + u32 slot); + +static inline int is_global_system_inode(int type) +{ + return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && + type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; +} + +static inline int is_in_system_inode_array(struct ocfs2_super *osb, + int type, + u32 slot) +{ + return slot == osb->slot_num || is_global_system_inode(type); +} + +struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, + int type, + u32 slot) +{ + struct inode *inode = NULL; + struct inode **arr = NULL; + + /* avoid the lookup if cached in local system file array */ + if (is_in_system_inode_array(osb, type, slot)) + arr = &(osb->system_inodes[type]); + + if (arr && ((inode = *arr) != NULL)) { + /* get a ref in addition to the array ref */ + inode = igrab(inode); + if (!inode) + BUG(); + + return inode; + } + + /* this gets one ref thru iget */ + inode = _ocfs2_get_system_file_inode(osb, type, slot); + + /* add one more if putting into array for first time */ + if (arr && inode) { + *arr = igrab(inode); + if (!*arr) + BUG(); + } + return inode; +} + +static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, + int type, + u32 slot) +{ + char namebuf[40]; + struct inode *inode = NULL; + u64 blkno; + struct buffer_head *dirent_bh = NULL; + struct ocfs2_dir_entry *de = NULL; + int status = 0; + + ocfs2_sprintf_system_inode_name(namebuf, + sizeof(namebuf), + type, slot); + + status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf), + &blkno, osb->sys_root_inode, + &dirent_bh, &de); + if (status < 0) { + goto bail; + } + + inode = ocfs2_iget(osb, blkno); + if (IS_ERR(inode)) { + mlog_errno(PTR_ERR(inode)); + inode = NULL; + goto bail; + } +bail: + if (dirent_bh) + brelse(dirent_bh); + return inode; +} + diff --git a/fs/ocfs2/sysfile.h b/fs/ocfs2/sysfile.h new file mode 100644 index 0000000..cc9ea66 --- /dev/null +++ b/fs/ocfs2/sysfile.h @@ -0,0 +1,33 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * sysfile.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_SYSFILE_H +#define OCFS2_SYSFILE_H + +struct inode * ocfs2_get_system_file_inode(struct ocfs2_super *osb, + int type, + u32 slot); + +#endif /* OCFS2_SYSFILE_H */ diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c new file mode 100644 index 0000000..3a0458f --- /dev/null +++ b/fs/ocfs2/uptodate.c @@ -0,0 +1,544 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * uptodate.c + * + * Tracking the up-to-date-ness of a local buffer_head with respect to + * the cluster. + * + * Copyright (C) 2002, 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Standard buffer head caching flags (uptodate, etc) are insufficient + * in a clustered environment - a buffer may be marked up to date on + * our local node but could have been modified by another cluster + * member. As a result an additional (and performant) caching scheme + * is required. A further requirement is that we consume as little + * memory as possible - we never pin buffer_head structures in order + * to cache them. + * + * We track the existence of up to date buffers on the inodes which + * are associated with them. Because we don't want to pin + * buffer_heads, this is only a (strong) hint and several other checks + * are made in the I/O path to ensure that we don't use a stale or + * invalid buffer without going to disk: + * - buffer_jbd is used liberally - if a bh is in the journal on + * this node then it *must* be up to date. + * - the standard buffer_uptodate() macro is used to detect buffers + * which may be invalid (even if we have an up to date tracking + * item for them) + * + * For a full understanding of how this code works together, one + * should read the callers in dlmglue.c, the I/O functions in + * buffer_head_io.c and ocfs2_journal_access in journal.c + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/buffer_head.h> +#include <linux/rbtree.h> +#include <linux/jbd.h> + +#define MLOG_MASK_PREFIX ML_UPTODATE + +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "inode.h" +#include "uptodate.h" + +struct ocfs2_meta_cache_item { + struct rb_node c_node; + sector_t c_block; +}; + +static kmem_cache_t *ocfs2_uptodate_cachep = NULL; + +void ocfs2_metadata_cache_init(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + + oi->ip_flags |= OCFS2_INODE_CACHE_INLINE; + ci->ci_num_cached = 0; +} + +/* No lock taken here as 'root' is not expected to be visible to other + * processes. */ +static unsigned int ocfs2_purge_copied_metadata_tree(struct rb_root *root) +{ + unsigned int purged = 0; + struct rb_node *node; + struct ocfs2_meta_cache_item *item; + + while ((node = rb_last(root)) != NULL) { + item = rb_entry(node, struct ocfs2_meta_cache_item, c_node); + + mlog(0, "Purge item %llu\n", + (unsigned long long) item->c_block); + + rb_erase(&item->c_node, root); + kmem_cache_free(ocfs2_uptodate_cachep, item); + + purged++; + } + return purged; +} + +/* Called from locking and called from ocfs2_clear_inode. Dump the + * cache for a given inode. + * + * This function is a few more lines longer than necessary due to some + * accounting done here, but I think it's worth tracking down those + * bugs sooner -- Mark */ +void ocfs2_metadata_cache_purge(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + unsigned int tree, to_purge, purged; + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + struct rb_root root = RB_ROOT; + + spin_lock(&oi->ip_lock); + tree = !(oi->ip_flags & OCFS2_INODE_CACHE_INLINE); + to_purge = ci->ci_num_cached; + + mlog(0, "Purge %u %s items from Inode %"MLFu64"\n", to_purge, + tree ? "array" : "tree", oi->ip_blkno); + + /* If we're a tree, save off the root so that we can safely + * initialize the cache. We do the work to free tree members + * without the spinlock. */ + if (tree) + root = ci->ci_cache.ci_tree; + + ocfs2_metadata_cache_init(inode); + spin_unlock(&oi->ip_lock); + + purged = ocfs2_purge_copied_metadata_tree(&root); + /* If possible, track the number wiped so that we can more + * easily detect counting errors. Unfortunately, this is only + * meaningful for trees. */ + if (tree && purged != to_purge) + mlog(ML_ERROR, "Inode %"MLFu64", count = %u, purged = %u\n", + oi->ip_blkno, to_purge, purged); +} + +/* Returns the index in the cache array, -1 if not found. + * Requires ip_lock. */ +static int ocfs2_search_cache_array(struct ocfs2_caching_info *ci, + sector_t item) +{ + int i; + + for (i = 0; i < ci->ci_num_cached; i++) { + if (item == ci->ci_cache.ci_array[i]) + return i; + } + + return -1; +} + +/* Returns the cache item if found, otherwise NULL. + * Requires ip_lock. */ +static struct ocfs2_meta_cache_item * +ocfs2_search_cache_tree(struct ocfs2_caching_info *ci, + sector_t block) +{ + struct rb_node * n = ci->ci_cache.ci_tree.rb_node; + struct ocfs2_meta_cache_item *item = NULL; + + while (n) { + item = rb_entry(n, struct ocfs2_meta_cache_item, c_node); + + if (block < item->c_block) + n = n->rb_left; + else if (block > item->c_block) + n = n->rb_right; + else + return item; + } + + return NULL; +} + +static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi, + struct buffer_head *bh) +{ + int index = -1; + struct ocfs2_meta_cache_item *item = NULL; + + spin_lock(&oi->ip_lock); + + mlog(0, "Inode %"MLFu64", query block %llu (inline = %u)\n", + oi->ip_blkno, (unsigned long long) bh->b_blocknr, + !!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE)); + + if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) + index = ocfs2_search_cache_array(&oi->ip_metadata_cache, + bh->b_blocknr); + else + item = ocfs2_search_cache_tree(&oi->ip_metadata_cache, + bh->b_blocknr); + + spin_unlock(&oi->ip_lock); + + mlog(0, "index = %d, item = %p\n", index, item); + + return (index != -1) || (item != NULL); +} + +/* Warning: even if it returns true, this does *not* guarantee that + * the block is stored in our inode metadata cache. */ +int ocfs2_buffer_uptodate(struct inode *inode, + struct buffer_head *bh) +{ + /* Doesn't matter if the bh is in our cache or not -- if it's + * not marked uptodate then we know it can't have correct + * data. */ + if (!buffer_uptodate(bh)) + return 0; + + /* OCFS2 does not allow multiple nodes to be changing the same + * block at the same time. */ + if (buffer_jbd(bh)) + return 1; + + /* Ok, locally the buffer is marked as up to date, now search + * our cache to see if we can trust that. */ + return ocfs2_buffer_cached(OCFS2_I(inode), bh); +} + +/* Requires ip_lock */ +static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci, + sector_t block) +{ + BUG_ON(ci->ci_num_cached >= OCFS2_INODE_MAX_CACHE_ARRAY); + + mlog(0, "block %llu takes position %u\n", (unsigned long long) block, + ci->ci_num_cached); + + ci->ci_cache.ci_array[ci->ci_num_cached] = block; + ci->ci_num_cached++; +} + +/* By now the caller should have checked that the item does *not* + * exist in the tree. + * Requires ip_lock. */ +static void __ocfs2_insert_cache_tree(struct ocfs2_caching_info *ci, + struct ocfs2_meta_cache_item *new) +{ + sector_t block = new->c_block; + struct rb_node *parent = NULL; + struct rb_node **p = &ci->ci_cache.ci_tree.rb_node; + struct ocfs2_meta_cache_item *tmp; + + mlog(0, "Insert block %llu num = %u\n", (unsigned long long) block, + ci->ci_num_cached); + + while(*p) { + parent = *p; + + tmp = rb_entry(parent, struct ocfs2_meta_cache_item, c_node); + + if (block < tmp->c_block) + p = &(*p)->rb_left; + else if (block > tmp->c_block) + p = &(*p)->rb_right; + else { + /* This should never happen! */ + mlog(ML_ERROR, "Duplicate block %llu cached!\n", + (unsigned long long) block); + BUG(); + } + } + + rb_link_node(&new->c_node, parent, p); + rb_insert_color(&new->c_node, &ci->ci_cache.ci_tree); + ci->ci_num_cached++; +} + +static inline int ocfs2_insert_can_use_array(struct ocfs2_inode_info *oi, + struct ocfs2_caching_info *ci) +{ + assert_spin_locked(&oi->ip_lock); + + return (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) && + (ci->ci_num_cached < OCFS2_INODE_MAX_CACHE_ARRAY); +} + +/* tree should be exactly OCFS2_INODE_MAX_CACHE_ARRAY wide. NULL the + * pointers in tree after we use them - this allows caller to detect + * when to free in case of error. */ +static void ocfs2_expand_cache(struct ocfs2_inode_info *oi, + struct ocfs2_meta_cache_item **tree) +{ + int i; + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + + mlog_bug_on_msg(ci->ci_num_cached != OCFS2_INODE_MAX_CACHE_ARRAY, + "Inode %"MLFu64", num cached = %u, should be %u\n", + oi->ip_blkno, ci->ci_num_cached, + OCFS2_INODE_MAX_CACHE_ARRAY); + mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE), + "Inode %"MLFu64" not marked as inline anymore!\n", + oi->ip_blkno); + assert_spin_locked(&oi->ip_lock); + + /* Be careful to initialize the tree members *first* because + * once the ci_tree is used, the array is junk... */ + for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) + tree[i]->c_block = ci->ci_cache.ci_array[i]; + + oi->ip_flags &= ~OCFS2_INODE_CACHE_INLINE; + ci->ci_cache.ci_tree = RB_ROOT; + /* this will be set again by __ocfs2_insert_cache_tree */ + ci->ci_num_cached = 0; + + for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) { + __ocfs2_insert_cache_tree(ci, tree[i]); + tree[i] = NULL; + } + + mlog(0, "Expanded %"MLFu64" to a tree cache: flags 0x%x, num = %u\n", + oi->ip_blkno, oi->ip_flags, ci->ci_num_cached); +} + +/* Slow path function - memory allocation is necessary. See the + * comment above ocfs2_set_buffer_uptodate for more information. */ +static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi, + sector_t block, + int expand_tree) +{ + int i; + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + struct ocfs2_meta_cache_item *new = NULL; + struct ocfs2_meta_cache_item *tree[OCFS2_INODE_MAX_CACHE_ARRAY] = + { NULL, }; + + mlog(0, "Inode %"MLFu64", block %llu, expand = %d\n", + oi->ip_blkno, (unsigned long long) block, expand_tree); + + new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_KERNEL); + if (!new) { + mlog_errno(-ENOMEM); + return; + } + new->c_block = block; + + if (expand_tree) { + /* Do *not* allocate an array here - the removal code + * has no way of tracking that. */ + for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) { + tree[i] = kmem_cache_alloc(ocfs2_uptodate_cachep, + GFP_KERNEL); + if (!tree[i]) { + mlog_errno(-ENOMEM); + goto out_free; + } + + /* These are initialized in ocfs2_expand_cache! */ + } + } + + spin_lock(&oi->ip_lock); + if (ocfs2_insert_can_use_array(oi, ci)) { + mlog(0, "Someone cleared the tree underneath us\n"); + /* Ok, items were removed from the cache in between + * locks. Detect this and revert back to the fast path */ + ocfs2_append_cache_array(ci, block); + spin_unlock(&oi->ip_lock); + goto out_free; + } + + if (expand_tree) + ocfs2_expand_cache(oi, tree); + + __ocfs2_insert_cache_tree(ci, new); + spin_unlock(&oi->ip_lock); + + new = NULL; +out_free: + if (new) + kmem_cache_free(ocfs2_uptodate_cachep, new); + + /* If these were used, then ocfs2_expand_cache re-set them to + * NULL for us. */ + if (tree[0]) { + for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) + if (tree[i]) + kmem_cache_free(ocfs2_uptodate_cachep, + tree[i]); + } +} + +/* Item insertion is guarded by ip_io_sem, so the insertion path takes + * advantage of this by not rechecking for a duplicate insert during + * the slow case. Additionally, if the cache needs to be bumped up to + * a tree, the code will not recheck after acquiring the lock -- + * multiple paths cannot be expanding to a tree at the same time. + * + * The slow path takes into account that items can be removed + * (including the whole tree wiped and reset) when this process it out + * allocating memory. In those cases, it reverts back to the fast + * path. + * + * Note that this function may actually fail to insert the block if + * memory cannot be allocated. This is not fatal however (but may + * result in a performance penalty) */ +void ocfs2_set_buffer_uptodate(struct inode *inode, + struct buffer_head *bh) +{ + int expand; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + + /* The block may very well exist in our cache already, so avoid + * doing any more work in that case. */ + if (ocfs2_buffer_cached(oi, bh)) + return; + + mlog(0, "Inode %"MLFu64", inserting block %llu\n", oi->ip_blkno, + (unsigned long long) bh->b_blocknr); + + /* No need to recheck under spinlock - insertion is guarded by + * ip_io_sem */ + spin_lock(&oi->ip_lock); + if (ocfs2_insert_can_use_array(oi, ci)) { + /* Fast case - it's an array and there's a free + * spot. */ + ocfs2_append_cache_array(ci, bh->b_blocknr); + spin_unlock(&oi->ip_lock); + return; + } + + expand = 0; + if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) { + /* We need to bump things up to a tree. */ + expand = 1; + } + spin_unlock(&oi->ip_lock); + + __ocfs2_set_buffer_uptodate(oi, bh->b_blocknr, expand); +} + +/* Called against a newly allocated buffer. Most likely nobody should + * be able to read this sort of metadata while it's still being + * allocated, but this is careful to take ip_io_sem anyway. */ +void ocfs2_set_new_buffer_uptodate(struct inode *inode, + struct buffer_head *bh) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + /* This should definitely *not* exist in our cache */ + BUG_ON(ocfs2_buffer_cached(oi, bh)); + + set_buffer_uptodate(bh); + + down(&oi->ip_io_sem); + ocfs2_set_buffer_uptodate(inode, bh); + up(&oi->ip_io_sem); +} + +/* Requires ip_lock. */ +static void ocfs2_remove_metadata_array(struct ocfs2_caching_info *ci, + int index) +{ + sector_t *array = ci->ci_cache.ci_array; + int bytes; + + BUG_ON(index < 0 || index >= OCFS2_INODE_MAX_CACHE_ARRAY); + BUG_ON(index >= ci->ci_num_cached); + BUG_ON(!ci->ci_num_cached); + + mlog(0, "remove index %d (num_cached = %u\n", index, + ci->ci_num_cached); + + ci->ci_num_cached--; + + /* don't need to copy if the array is now empty, or if we + * removed at the tail */ + if (ci->ci_num_cached && index < ci->ci_num_cached) { + bytes = sizeof(sector_t) * (ci->ci_num_cached - index); + memmove(&array[index], &array[index + 1], bytes); + } +} + +/* Requires ip_lock. */ +static void ocfs2_remove_metadata_tree(struct ocfs2_caching_info *ci, + struct ocfs2_meta_cache_item *item) +{ + mlog(0, "remove block %llu from tree\n", + (unsigned long long) item->c_block); + + rb_erase(&item->c_node, &ci->ci_cache.ci_tree); + ci->ci_num_cached--; +} + +/* Called when we remove a chunk of metadata from an inode. We don't + * bother reverting things to an inlined array in the case of a remove + * which moves us back under the limit. */ +void ocfs2_remove_from_cache(struct inode *inode, + struct buffer_head *bh) +{ + int index; + sector_t block = bh->b_blocknr; + struct ocfs2_meta_cache_item *item = NULL; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_caching_info *ci = &oi->ip_metadata_cache; + + spin_lock(&oi->ip_lock); + mlog(0, "Inode %"MLFu64", remove %llu, items = %u, array = %u\n", + oi->ip_blkno, (unsigned long long) block, ci->ci_num_cached, + oi->ip_flags & OCFS2_INODE_CACHE_INLINE); + + if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) { + index = ocfs2_search_cache_array(ci, block); + if (index != -1) + ocfs2_remove_metadata_array(ci, index); + } else { + item = ocfs2_search_cache_tree(ci, block); + if (item) + ocfs2_remove_metadata_tree(ci, item); + } + spin_unlock(&oi->ip_lock); + + if (item) + kmem_cache_free(ocfs2_uptodate_cachep, item); +} + +int __init init_ocfs2_uptodate_cache(void) +{ + ocfs2_uptodate_cachep = kmem_cache_create("ocfs2_uptodate", + sizeof(struct ocfs2_meta_cache_item), + 0, SLAB_HWCACHE_ALIGN, NULL, NULL); + if (!ocfs2_uptodate_cachep) + return -ENOMEM; + + mlog(0, "%u inlined cache items per inode.\n", + OCFS2_INODE_MAX_CACHE_ARRAY); + + return 0; +} + +void __exit exit_ocfs2_uptodate_cache(void) +{ + if (ocfs2_uptodate_cachep) + kmem_cache_destroy(ocfs2_uptodate_cachep); +} diff --git a/fs/ocfs2/uptodate.h b/fs/ocfs2/uptodate.h new file mode 100644 index 0000000..e5aacdf --- /dev/null +++ b/fs/ocfs2/uptodate.h @@ -0,0 +1,44 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * uptodate.h + * + * Cluster uptodate tracking + * + * Copyright (C) 2002, 2004, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_UPTODATE_H +#define OCFS2_UPTODATE_H + +int __init init_ocfs2_uptodate_cache(void); +void __exit exit_ocfs2_uptodate_cache(void); + +void ocfs2_metadata_cache_init(struct inode *inode); +void ocfs2_metadata_cache_purge(struct inode *inode); + +int ocfs2_buffer_uptodate(struct inode *inode, + struct buffer_head *bh); +void ocfs2_set_buffer_uptodate(struct inode *inode, + struct buffer_head *bh); +void ocfs2_set_new_buffer_uptodate(struct inode *inode, + struct buffer_head *bh); +void ocfs2_remove_from_cache(struct inode *inode, + struct buffer_head *bh); + +#endif /* OCFS2_UPTODATE_H */ diff --git a/fs/ocfs2/ver.c b/fs/ocfs2/ver.c new file mode 100644 index 0000000..5405ce1 --- /dev/null +++ b/fs/ocfs2/ver.c @@ -0,0 +1,43 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ver.c + * + * version string + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/kernel.h> + +#include "ver.h" + +#define OCFS2_BUILD_VERSION "1.3.3" + +#define VERSION_STR "OCFS2 " OCFS2_BUILD_VERSION + +void ocfs2_print_version(void) +{ + printk(KERN_INFO "%s\n", VERSION_STR); +} + +MODULE_DESCRIPTION(VERSION_STR); + +MODULE_VERSION(OCFS2_BUILD_VERSION); diff --git a/fs/ocfs2/ver.h b/fs/ocfs2/ver.h new file mode 100644 index 0000000..d7395cb --- /dev/null +++ b/fs/ocfs2/ver.h @@ -0,0 +1,31 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ver.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef OCFS2_VER_H +#define OCFS2_VER_H + +void ocfs2_print_version(void); + +#endif /* OCFS2_VER_H */ diff --git a/fs/ocfs2/vote.c b/fs/ocfs2/vote.c new file mode 100644 index 0000000..021978e --- /dev/null +++ b/fs/ocfs2/vote.c @@ -0,0 +1,1202 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * vote.c + * + * description here + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/smp_lock.h> +#include <linux/kthread.h> + +#include <cluster/heartbeat.h> +#include <cluster/nodemanager.h> +#include <cluster/tcp.h> + +#include <dlm/dlmapi.h> + +#define MLOG_MASK_PREFIX ML_VOTE +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "heartbeat.h" +#include "inode.h" +#include "journal.h" +#include "slot_map.h" +#include "vote.h" + +#include "buffer_head_io.h" + +#define OCFS2_MESSAGE_TYPE_VOTE (0x1) +#define OCFS2_MESSAGE_TYPE_RESPONSE (0x2) +struct ocfs2_msg_hdr +{ + __be32 h_response_id; /* used to lookup message handle on sending + * node. */ + __be32 h_request; + __be64 h_blkno; + __be32 h_generation; + __be32 h_node_num; /* node sending this particular message. */ +}; + +/* OCFS2_MAX_FILENAME_LEN is 255 characters, but we want to align this + * for the network. */ +#define OCFS2_VOTE_FILENAME_LEN 256 +struct ocfs2_vote_msg +{ + struct ocfs2_msg_hdr v_hdr; + union { + __be32 v_generic1; + __be32 v_orphaned_slot; /* Used during delete votes */ + __be32 v_nlink; /* Used during unlink votes */ + } md1; /* Message type dependant 1 */ + __be32 v_unlink_namelen; + __be64 v_unlink_parent; + u8 v_unlink_dirent[OCFS2_VOTE_FILENAME_LEN]; +}; + +/* Responses are given these values to maintain backwards + * compatibility with older ocfs2 versions */ +#define OCFS2_RESPONSE_OK (0) +#define OCFS2_RESPONSE_BUSY (-16) +#define OCFS2_RESPONSE_BAD_MSG (-22) + +struct ocfs2_response_msg +{ + struct ocfs2_msg_hdr r_hdr; + __be32 r_response; + __be32 r_orphaned_slot; +}; + +struct ocfs2_vote_work { + struct list_head w_list; + struct ocfs2_vote_msg w_msg; +}; + +enum ocfs2_vote_request { + OCFS2_VOTE_REQ_INVALID = 0, + OCFS2_VOTE_REQ_DELETE, + OCFS2_VOTE_REQ_UNLINK, + OCFS2_VOTE_REQ_RENAME, + OCFS2_VOTE_REQ_MOUNT, + OCFS2_VOTE_REQ_UMOUNT, + OCFS2_VOTE_REQ_LAST +}; + +static inline int ocfs2_is_valid_vote_request(int request) +{ + return OCFS2_VOTE_REQ_INVALID < request && + request < OCFS2_VOTE_REQ_LAST; +} + +typedef void (*ocfs2_net_response_callback)(void *priv, + struct ocfs2_response_msg *resp); +struct ocfs2_net_response_cb { + ocfs2_net_response_callback rc_cb; + void *rc_priv; +}; + +struct ocfs2_net_wait_ctxt { + struct list_head n_list; + u32 n_response_id; + wait_queue_head_t n_event; + struct ocfs2_node_map n_node_map; + int n_response; /* an agreggate response. 0 if + * all nodes are go, < 0 on any + * negative response from any + * node or network error. */ + struct ocfs2_net_response_cb *n_callback; +}; + +static void ocfs2_process_mount_request(struct ocfs2_super *osb, + unsigned int node_num) +{ + mlog(0, "MOUNT vote from node %u\n", node_num); + /* The other node only sends us this message when he has an EX + * on the superblock, so our recovery threads (if having been + * launched) are waiting on it.*/ + ocfs2_recovery_map_clear(osb, node_num); + ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num); + + /* We clear the umount map here because a node may have been + * previously mounted, safely unmounted but never stopped + * heartbeating - in which case we'd have a stale entry. */ + ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num); +} + +static void ocfs2_process_umount_request(struct ocfs2_super *osb, + unsigned int node_num) +{ + mlog(0, "UMOUNT vote from node %u\n", node_num); + ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num); + ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num); +} + +void ocfs2_mark_inode_remotely_deleted(struct inode *inode) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + assert_spin_locked(&oi->ip_lock); + /* We set the SKIP_DELETE flag on the inode so we don't try to + * delete it in delete_inode ourselves, thus avoiding + * unecessary lock pinging. If the other node failed to wipe + * the inode as a result of a crash, then recovery will pick + * up the slack. */ + oi->ip_flags |= OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE; +} + +static int ocfs2_process_delete_request(struct inode *inode, + int *orphaned_slot) +{ + int response = OCFS2_RESPONSE_BUSY; + + mlog(0, "DELETE vote on inode %lu, read lnk_cnt = %u, slot = %d\n", + inode->i_ino, inode->i_nlink, *orphaned_slot); + + spin_lock(&OCFS2_I(inode)->ip_lock); + + /* Whatever our vote response is, we want to make sure that + * the orphaned slot is recorded properly on this node *and* + * on the requesting node. Technically, if the requesting node + * did not know which slot the inode is orphaned in but we + * respond with BUSY he doesn't actually need the orphaned + * slot, but it doesn't hurt to do it here anyway. */ + if ((*orphaned_slot) != OCFS2_INVALID_SLOT) { + mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != + OCFS2_INVALID_SLOT && + OCFS2_I(inode)->ip_orphaned_slot != + (*orphaned_slot), + "Inode %"MLFu64": This node thinks it's " + "orphaned in slot %d, messaged it's in %d\n", + OCFS2_I(inode)->ip_blkno, + OCFS2_I(inode)->ip_orphaned_slot, + *orphaned_slot); + + mlog(0, "Setting orphaned slot for inode %"MLFu64" to %d\n", + OCFS2_I(inode)->ip_blkno, *orphaned_slot); + + OCFS2_I(inode)->ip_orphaned_slot = *orphaned_slot; + } else { + mlog(0, "Sending back orphaned slot %d for inode %"MLFu64"\n", + OCFS2_I(inode)->ip_orphaned_slot, + OCFS2_I(inode)->ip_blkno); + + *orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot; + } + + /* vote no if the file is still open. */ + if (OCFS2_I(inode)->ip_open_count) { + mlog(0, "open count = %u\n", + OCFS2_I(inode)->ip_open_count); + spin_unlock(&OCFS2_I(inode)->ip_lock); + goto done; + } + spin_unlock(&OCFS2_I(inode)->ip_lock); + + /* directories are a bit ugly... What if someone is sitting in + * it? We want to make sure the inode is removed completely as + * a result of the iput in process_vote. */ + if (S_ISDIR(inode->i_mode) && (atomic_read(&inode->i_count) != 1)) { + mlog(0, "i_count = %u\n", atomic_read(&inode->i_count)); + goto done; + } + + if (filemap_fdatawrite(inode->i_mapping)) { + mlog(ML_ERROR, "Could not sync inode %"MLFu64" for delete!\n", + OCFS2_I(inode)->ip_blkno); + goto done; + } + sync_mapping_buffers(inode->i_mapping); + truncate_inode_pages(inode->i_mapping, 0); + ocfs2_extent_map_trunc(inode, 0); + + spin_lock(&OCFS2_I(inode)->ip_lock); + /* double check open count - someone might have raced this + * thread into ocfs2_file_open while we were writing out + * data. If we're to allow a wipe of this inode now, we *must* + * hold the spinlock until we've marked it. */ + if (OCFS2_I(inode)->ip_open_count) { + mlog(0, "Raced to wipe! open count = %u\n", + OCFS2_I(inode)->ip_open_count); + spin_unlock(&OCFS2_I(inode)->ip_lock); + goto done; + } + + /* Mark the inode as being wiped from disk. */ + ocfs2_mark_inode_remotely_deleted(inode); + spin_unlock(&OCFS2_I(inode)->ip_lock); + + /* Not sure this is necessary anymore. */ + d_prune_aliases(inode); + + /* If we get here, then we're voting 'yes', so commit the + * delete on our side. */ + response = OCFS2_RESPONSE_OK; +done: + return response; +} + +static int ocfs2_match_dentry(struct dentry *dentry, + u64 parent_blkno, + unsigned int namelen, + const char *name) +{ + struct inode *parent; + + if (!dentry->d_parent) { + mlog(0, "Detached from parent.\n"); + return 0; + } + + parent = dentry->d_parent->d_inode; + /* Negative parent dentry? */ + if (!parent) + return 0; + + /* Name is in a different directory. */ + if (OCFS2_I(parent)->ip_blkno != parent_blkno) + return 0; + + if (dentry->d_name.len != namelen) + return 0; + + /* comparison above guarantees this is safe. */ + if (memcmp(dentry->d_name.name, name, namelen)) + return 0; + + return 1; +} + +static void ocfs2_process_dentry_request(struct inode *inode, + int rename, + unsigned int new_nlink, + u64 parent_blkno, + unsigned int namelen, + const char *name) +{ + struct dentry *dentry = NULL; + struct list_head *p; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + mlog(0, "parent %"MLFu64", namelen = %u, name = %.*s\n", parent_blkno, + namelen, namelen, name); + + spin_lock(&dcache_lock); + + /* Another node is removing this name from the system. It is + * up to us to find the corresponding dentry and if it exists, + * unhash it from the dcache. */ + list_for_each(p, &inode->i_dentry) { + dentry = list_entry(p, struct dentry, d_alias); + + if (ocfs2_match_dentry(dentry, parent_blkno, namelen, name)) { + mlog(0, "dentry found: %.*s\n", + dentry->d_name.len, dentry->d_name.name); + + dget_locked(dentry); + break; + } + + dentry = NULL; + } + + spin_unlock(&dcache_lock); + + if (dentry) { + d_delete(dentry); + dput(dentry); + } + + /* rename votes don't send link counts */ + if (!rename) { + mlog(0, "new_nlink = %u\n", new_nlink); + + /* We don't have the proper locks here to directly + * change i_nlink and besides, the vote is sent + * *before* the operation so it may have failed on the + * other node. This passes a hint to ocfs2_drop_inode + * to force ocfs2_delete_inode, who will take the + * proper cluster locks to sort things out. */ + if (new_nlink == 0) { + spin_lock(&oi->ip_lock); + oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; + spin_unlock(&OCFS2_I(inode)->ip_lock); + } + } +} + +static void ocfs2_process_vote(struct ocfs2_super *osb, + struct ocfs2_vote_msg *msg) +{ + int net_status, vote_response; + int orphaned_slot = 0; + int rename = 0; + unsigned int node_num, generation, new_nlink, namelen; + u64 blkno, parent_blkno; + enum ocfs2_vote_request request; + struct inode *inode = NULL; + struct ocfs2_msg_hdr *hdr = &msg->v_hdr; + struct ocfs2_response_msg response; + + /* decode the network mumbo jumbo into local variables. */ + request = be32_to_cpu(hdr->h_request); + blkno = be64_to_cpu(hdr->h_blkno); + generation = be32_to_cpu(hdr->h_generation); + node_num = be32_to_cpu(hdr->h_node_num); + if (request == OCFS2_VOTE_REQ_DELETE) + orphaned_slot = be32_to_cpu(msg->md1.v_orphaned_slot); + + mlog(0, "processing vote: request = %u, blkno = %"MLFu64", " + "generation = %u, node_num = %u, priv1 = %u\n", request, + blkno, generation, node_num, be32_to_cpu(msg->md1.v_generic1)); + + if (!ocfs2_is_valid_vote_request(request)) { + mlog(ML_ERROR, "Invalid vote request %d from node %u\n", + request, node_num); + vote_response = OCFS2_RESPONSE_BAD_MSG; + goto respond; + } + + vote_response = OCFS2_RESPONSE_OK; + + switch (request) { + case OCFS2_VOTE_REQ_UMOUNT: + ocfs2_process_umount_request(osb, node_num); + goto respond; + case OCFS2_VOTE_REQ_MOUNT: + ocfs2_process_mount_request(osb, node_num); + goto respond; + default: + /* avoids a gcc warning */ + break; + } + + /* We cannot process the remaining message types before we're + * fully mounted. It's perfectly safe however to send a 'yes' + * response as we can't possibly have any of the state they're + * asking us to modify yet. */ + if (atomic_read(&osb->vol_state) == VOLUME_INIT) + goto respond; + + /* If we get here, then the request is against an inode. */ + inode = ocfs2_ilookup_for_vote(osb, blkno, + request == OCFS2_VOTE_REQ_DELETE); + + /* Not finding the inode is perfectly valid - it means we're + * not interested in what the other node is about to do to it + * so in those cases we automatically respond with an + * affirmative. Cluster locking ensures that we won't race + * interest in the inode with this vote request. */ + if (!inode) + goto respond; + + /* Check generation values. It's possible for us to get a + * request against a stale inode. If so then we proceed as if + * we had not found an inode in the first place. */ + if (inode->i_generation != generation) { + mlog(0, "generation passed %u != inode generation = %u, " + "ip_flags = %x, ip_blkno = %"MLFu64", msg %"MLFu64", " + "i_count = %u, message type = %u\n", + generation, inode->i_generation, OCFS2_I(inode)->ip_flags, + OCFS2_I(inode)->ip_blkno, blkno, + atomic_read(&inode->i_count), request); + iput(inode); + inode = NULL; + goto respond; + } + + switch (request) { + case OCFS2_VOTE_REQ_DELETE: + vote_response = ocfs2_process_delete_request(inode, + &orphaned_slot); + break; + case OCFS2_VOTE_REQ_RENAME: + rename = 1; + /* fall through */ + case OCFS2_VOTE_REQ_UNLINK: + parent_blkno = be64_to_cpu(msg->v_unlink_parent); + namelen = be32_to_cpu(msg->v_unlink_namelen); + /* new_nlink will be ignored in case of a rename vote */ + new_nlink = be32_to_cpu(msg->md1.v_nlink); + ocfs2_process_dentry_request(inode, rename, new_nlink, + parent_blkno, namelen, + msg->v_unlink_dirent); + break; + default: + mlog(ML_ERROR, "node %u, invalid request: %u\n", + node_num, request); + vote_response = OCFS2_RESPONSE_BAD_MSG; + } + +respond: + /* Response struture is small so we just put it on the stack + * and stuff it inline. */ + memset(&response, 0, sizeof(struct ocfs2_response_msg)); + response.r_hdr.h_response_id = hdr->h_response_id; + response.r_hdr.h_blkno = hdr->h_blkno; + response.r_hdr.h_generation = hdr->h_generation; + response.r_hdr.h_node_num = cpu_to_be32(osb->node_num); + response.r_response = cpu_to_be32(vote_response); + response.r_orphaned_slot = cpu_to_be32(orphaned_slot); + + net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE, + osb->net_key, + &response, + sizeof(struct ocfs2_response_msg), + node_num, + NULL); + /* We still want to error print for ENOPROTOOPT here. The + * sending node shouldn't have unregistered his net handler + * without sending an unmount vote 1st */ + if (net_status < 0 + && net_status != -ETIMEDOUT + && net_status != -ENOTCONN) + mlog(ML_ERROR, "message to node %u fails with error %d!\n", + node_num, net_status); + + if (inode) + iput(inode); +} + +static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb) +{ + unsigned long processed; + struct ocfs2_lock_res *lockres; + struct ocfs2_vote_work *work; + + mlog_entry_void(); + + spin_lock(&osb->vote_task_lock); + /* grab this early so we know to try again if a state change and + * wake happens part-way through our work */ + osb->vote_work_sequence = osb->vote_wake_sequence; + + processed = osb->blocked_lock_count; + while (processed) { + BUG_ON(list_empty(&osb->blocked_lock_list)); + + lockres = list_entry(osb->blocked_lock_list.next, + struct ocfs2_lock_res, l_blocked_list); + list_del_init(&lockres->l_blocked_list); + osb->blocked_lock_count--; + spin_unlock(&osb->vote_task_lock); + + BUG_ON(!processed); + processed--; + + ocfs2_process_blocked_lock(osb, lockres); + + spin_lock(&osb->vote_task_lock); + } + + while (osb->vote_count) { + BUG_ON(list_empty(&osb->vote_list)); + work = list_entry(osb->vote_list.next, + struct ocfs2_vote_work, w_list); + list_del(&work->w_list); + osb->vote_count--; + spin_unlock(&osb->vote_task_lock); + + ocfs2_process_vote(osb, &work->w_msg); + kfree(work); + + spin_lock(&osb->vote_task_lock); + } + spin_unlock(&osb->vote_task_lock); + + mlog_exit_void(); +} + +static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb) +{ + int empty = 0; + + spin_lock(&osb->vote_task_lock); + if (list_empty(&osb->blocked_lock_list) && + list_empty(&osb->vote_list)) + empty = 1; + + spin_unlock(&osb->vote_task_lock); + return empty; +} + +static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb) +{ + int should_wake = 0; + + spin_lock(&osb->vote_task_lock); + if (osb->vote_work_sequence != osb->vote_wake_sequence) + should_wake = 1; + spin_unlock(&osb->vote_task_lock); + + return should_wake; +} + +int ocfs2_vote_thread(void *arg) +{ + int status = 0; + struct ocfs2_super *osb = arg; + + /* only quit once we've been asked to stop and there is no more + * work available */ + while (!(kthread_should_stop() && + ocfs2_vote_thread_lists_empty(osb))) { + + wait_event_interruptible(osb->vote_event, + ocfs2_vote_thread_should_wake(osb) || + kthread_should_stop()); + + mlog(0, "vote_thread: awoken\n"); + + ocfs2_vote_thread_do_work(osb); + } + + osb->vote_task = NULL; + return status; +} + +static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id) +{ + struct ocfs2_net_wait_ctxt *w; + + w = kcalloc(1, sizeof(*w), GFP_KERNEL); + if (!w) { + mlog_errno(-ENOMEM); + goto bail; + } + + INIT_LIST_HEAD(&w->n_list); + init_waitqueue_head(&w->n_event); + ocfs2_node_map_init(&w->n_node_map); + w->n_response_id = response_id; + w->n_callback = NULL; +bail: + return w; +} + +static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb) +{ + unsigned int ret; + + spin_lock(&osb->net_response_lock); + ret = ++osb->net_response_ids; + spin_unlock(&osb->net_response_lock); + + return ret; +} + +static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb, + struct ocfs2_net_wait_ctxt *w) +{ + spin_lock(&osb->net_response_lock); + list_del(&w->n_list); + spin_unlock(&osb->net_response_lock); +} + +static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb, + struct ocfs2_net_wait_ctxt *w) +{ + spin_lock(&osb->net_response_lock); + list_add_tail(&w->n_list, + &osb->net_response_list); + spin_unlock(&osb->net_response_lock); +} + +static void __ocfs2_mark_node_responded(struct ocfs2_super *osb, + struct ocfs2_net_wait_ctxt *w, + int node_num) +{ + assert_spin_locked(&osb->net_response_lock); + + ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num); + if (ocfs2_node_map_is_empty(osb, &w->n_node_map)) + wake_up(&w->n_event); +} + +/* Intended to be called from the node down callback, we fake remove + * the node from all our response contexts */ +void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb, + int node_num) +{ + struct list_head *p; + struct ocfs2_net_wait_ctxt *w = NULL; + + spin_lock(&osb->net_response_lock); + + list_for_each(p, &osb->net_response_list) { + w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); + + __ocfs2_mark_node_responded(osb, w, node_num); + } + + spin_unlock(&osb->net_response_lock); +} + +static int ocfs2_broadcast_vote(struct ocfs2_super *osb, + struct ocfs2_vote_msg *request, + unsigned int response_id, + int *response, + struct ocfs2_net_response_cb *callback) +{ + int status, i, remote_err; + struct ocfs2_net_wait_ctxt *w = NULL; + int dequeued = 0; + + mlog_entry_void(); + + w = ocfs2_new_net_wait_ctxt(response_id); + if (!w) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + w->n_callback = callback; + + /* we're pretty much ready to go at this point, and this fills + * in n_response which we need anyway... */ + ocfs2_queue_net_wait_ctxt(osb, w); + + i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0); + + while (i != O2NM_INVALID_NODE_NUM) { + if (i != osb->node_num) { + mlog(0, "trying to send request to node %i\n", i); + ocfs2_node_map_set_bit(osb, &w->n_node_map, i); + + remote_err = 0; + status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE, + osb->net_key, + request, + sizeof(*request), + i, + &remote_err); + if (status == -ETIMEDOUT) { + mlog(0, "remote node %d timed out!\n", i); + status = -EAGAIN; + goto bail; + } + if (remote_err < 0) { + status = remote_err; + mlog(0, "remote error %d on node %d!\n", + remote_err, i); + mlog_errno(status); + goto bail; + } + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + i++; + i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i); + mlog(0, "next is %d, i am %d\n", i, osb->node_num); + } + mlog(0, "done sending, now waiting on responses...\n"); + + wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map)); + + ocfs2_dequeue_net_wait_ctxt(osb, w); + dequeued = 1; + + *response = w->n_response; + status = 0; +bail: + if (w) { + if (!dequeued) + ocfs2_dequeue_net_wait_ctxt(osb, w); + kfree(w); + } + + mlog_exit(status); + return status; +} + +static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb, + u64 blkno, + unsigned int generation, + enum ocfs2_vote_request type, + u32 priv) +{ + struct ocfs2_vote_msg *request; + struct ocfs2_msg_hdr *hdr; + + BUG_ON(!ocfs2_is_valid_vote_request(type)); + + request = kcalloc(1, sizeof(*request), GFP_KERNEL); + if (!request) { + mlog_errno(-ENOMEM); + } else { + hdr = &request->v_hdr; + hdr->h_node_num = cpu_to_be32(osb->node_num); + hdr->h_request = cpu_to_be32(type); + hdr->h_blkno = cpu_to_be64(blkno); + hdr->h_generation = cpu_to_be32(generation); + + request->md1.v_generic1 = cpu_to_be32(priv); + } + + return request; +} + +/* Complete the buildup of a new vote request and process the + * broadcast return value. */ +static int ocfs2_do_request_vote(struct ocfs2_super *osb, + struct ocfs2_vote_msg *request, + struct ocfs2_net_response_cb *callback) +{ + int status, response; + unsigned int response_id; + struct ocfs2_msg_hdr *hdr; + + response_id = ocfs2_new_response_id(osb); + + hdr = &request->v_hdr; + hdr->h_response_id = cpu_to_be32(response_id); + + status = ocfs2_broadcast_vote(osb, request, response_id, &response, + callback); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = response; +bail: + + return status; +} + +static int ocfs2_request_vote(struct inode *inode, + struct ocfs2_vote_msg *request, + struct ocfs2_net_response_cb *callback) +{ + int status; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + if (ocfs2_inode_is_new(inode)) + return 0; + + status = -EAGAIN; + while (status == -EAGAIN) { + if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) && + signal_pending(current)) + return -ERESTARTSYS; + + status = ocfs2_super_lock(osb, 0); + if (status < 0) { + mlog_errno(status); + break; + } + + status = 0; + if (!ocfs2_node_map_is_only(osb, &osb->mounted_map, + osb->node_num)) + status = ocfs2_do_request_vote(osb, request, callback); + + ocfs2_super_unlock(osb, 0); + } + return status; +} + +static void ocfs2_delete_response_cb(void *priv, + struct ocfs2_response_msg *resp) +{ + int orphaned_slot, node; + struct inode *inode = priv; + + orphaned_slot = be32_to_cpu(resp->r_orphaned_slot); + node = be32_to_cpu(resp->r_hdr.h_node_num); + mlog(0, "node %d tells us that inode %"MLFu64" is orphaned in slot " + "%d\n", node, OCFS2_I(inode)->ip_blkno, orphaned_slot); + + /* The other node may not actually know which slot the inode + * is orphaned in. */ + if (orphaned_slot == OCFS2_INVALID_SLOT) + return; + + /* Ok, the responding node knows which slot this inode is + * orphaned in. We verify that the information is correct and + * then record this in the inode. ocfs2_delete_inode will use + * this information to determine which lock to take. */ + spin_lock(&OCFS2_I(inode)->ip_lock); + mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != orphaned_slot && + OCFS2_I(inode)->ip_orphaned_slot + != OCFS2_INVALID_SLOT, "Inode %"MLFu64": Node %d " + "says it's orphaned in slot %d, we think it's in %d\n", + OCFS2_I(inode)->ip_blkno, + be32_to_cpu(resp->r_hdr.h_node_num), + orphaned_slot, OCFS2_I(inode)->ip_orphaned_slot); + + OCFS2_I(inode)->ip_orphaned_slot = orphaned_slot; + spin_unlock(&OCFS2_I(inode)->ip_lock); +} + +int ocfs2_request_delete_vote(struct inode *inode) +{ + int orphaned_slot, status; + struct ocfs2_net_response_cb delete_cb; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_vote_msg *request; + + spin_lock(&OCFS2_I(inode)->ip_lock); + orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot; + spin_unlock(&OCFS2_I(inode)->ip_lock); + + delete_cb.rc_cb = ocfs2_delete_response_cb; + delete_cb.rc_priv = inode; + + mlog(0, "Inode %"MLFu64", we start thinking orphaned slot is %d\n", + OCFS2_I(inode)->ip_blkno, orphaned_slot); + + status = -ENOMEM; + request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno, + inode->i_generation, + OCFS2_VOTE_REQ_DELETE, orphaned_slot); + if (request) { + status = ocfs2_request_vote(inode, request, &delete_cb); + + kfree(request); + } + + return status; +} + +static void ocfs2_setup_unlink_vote(struct ocfs2_vote_msg *request, + struct dentry *dentry) +{ + struct inode *parent = dentry->d_parent->d_inode; + + /* We need some values which will uniquely identify a dentry + * on the other nodes so that they can find it and run + * d_delete against it. Parent directory block and full name + * should suffice. */ + + mlog(0, "unlink/rename request: parent: %"MLFu64" name: %.*s\n", + OCFS2_I(parent)->ip_blkno, dentry->d_name.len, + dentry->d_name.name); + + request->v_unlink_parent = cpu_to_be64(OCFS2_I(parent)->ip_blkno); + request->v_unlink_namelen = cpu_to_be32(dentry->d_name.len); + memcpy(request->v_unlink_dirent, dentry->d_name.name, + dentry->d_name.len); +} + +int ocfs2_request_unlink_vote(struct inode *inode, + struct dentry *dentry, + unsigned int nlink) +{ + int status; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_vote_msg *request; + + if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN) + return -ENAMETOOLONG; + + status = -ENOMEM; + request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno, + inode->i_generation, + OCFS2_VOTE_REQ_UNLINK, nlink); + if (request) { + ocfs2_setup_unlink_vote(request, dentry); + + status = ocfs2_request_vote(inode, request, NULL); + + kfree(request); + } + return status; +} + +int ocfs2_request_rename_vote(struct inode *inode, + struct dentry *dentry) +{ + int status; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_vote_msg *request; + + if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN) + return -ENAMETOOLONG; + + status = -ENOMEM; + request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno, + inode->i_generation, + OCFS2_VOTE_REQ_RENAME, 0); + if (request) { + ocfs2_setup_unlink_vote(request, dentry); + + status = ocfs2_request_vote(inode, request, NULL); + + kfree(request); + } + return status; +} + +int ocfs2_request_mount_vote(struct ocfs2_super *osb) +{ + int status; + struct ocfs2_vote_msg *request = NULL; + + request = ocfs2_new_vote_request(osb, 0ULL, 0, + OCFS2_VOTE_REQ_MOUNT, 0); + if (!request) { + status = -ENOMEM; + goto bail; + } + + status = -EAGAIN; + while (status == -EAGAIN) { + if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) && + signal_pending(current)) { + status = -ERESTARTSYS; + goto bail; + } + + if (ocfs2_node_map_is_only(osb, &osb->mounted_map, + osb->node_num)) { + status = 0; + goto bail; + } + + status = ocfs2_do_request_vote(osb, request, NULL); + } + +bail: + if (request) + kfree(request); + + return status; +} + +int ocfs2_request_umount_vote(struct ocfs2_super *osb) +{ + int status; + struct ocfs2_vote_msg *request = NULL; + + request = ocfs2_new_vote_request(osb, 0ULL, 0, + OCFS2_VOTE_REQ_UMOUNT, 0); + if (!request) { + status = -ENOMEM; + goto bail; + } + + status = -EAGAIN; + while (status == -EAGAIN) { + /* Do not check signals on this vote... We really want + * this one to go all the way through. */ + + if (ocfs2_node_map_is_only(osb, &osb->mounted_map, + osb->node_num)) { + status = 0; + goto bail; + } + + status = ocfs2_do_request_vote(osb, request, NULL); + } + +bail: + if (request) + kfree(request); + + return status; +} + +/* TODO: This should eventually be a hash table! */ +static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb, + u32 response_id) +{ + struct list_head *p; + struct ocfs2_net_wait_ctxt *w = NULL; + + list_for_each(p, &osb->net_response_list) { + w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); + if (response_id == w->n_response_id) + break; + w = NULL; + } + + return w; +} + +/* Translate response codes into local node errno values */ +static inline int ocfs2_translate_response(int response) +{ + int ret; + + switch (response) { + case OCFS2_RESPONSE_OK: + ret = 0; + break; + + case OCFS2_RESPONSE_BUSY: + ret = -EBUSY; + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static int ocfs2_handle_response_message(struct o2net_msg *msg, + u32 len, + void *data) +{ + unsigned int response_id, node_num; + int response_status; + struct ocfs2_super *osb = data; + struct ocfs2_response_msg *resp; + struct ocfs2_net_wait_ctxt * w; + struct ocfs2_net_response_cb *resp_cb; + + resp = (struct ocfs2_response_msg *) msg->buf; + + response_id = be32_to_cpu(resp->r_hdr.h_response_id); + node_num = be32_to_cpu(resp->r_hdr.h_node_num); + response_status = + ocfs2_translate_response(be32_to_cpu(resp->r_response)); + + mlog(0, "received response message:\n"); + mlog(0, "h_response_id = %u\n", response_id); + mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request)); + mlog(0, "h_blkno = %"MLFu64"\n", be64_to_cpu(resp->r_hdr.h_blkno)); + mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation)); + mlog(0, "h_node_num = %u\n", node_num); + mlog(0, "r_response = %d\n", response_status); + + spin_lock(&osb->net_response_lock); + w = __ocfs2_find_net_wait_ctxt(osb, response_id); + if (!w) { + mlog(0, "request not found!\n"); + goto bail; + } + resp_cb = w->n_callback; + + if (response_status && (!w->n_response)) { + /* we only really need one negative response so don't + * set it twice. */ + w->n_response = response_status; + } + + if (resp_cb) { + spin_unlock(&osb->net_response_lock); + + resp_cb->rc_cb(resp_cb->rc_priv, resp); + + spin_lock(&osb->net_response_lock); + } + + __ocfs2_mark_node_responded(osb, w, node_num); +bail: + spin_unlock(&osb->net_response_lock); + + return 0; +} + +static int ocfs2_handle_vote_message(struct o2net_msg *msg, + u32 len, + void *data) +{ + int status; + struct ocfs2_super *osb = data; + struct ocfs2_vote_work *work; + + work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_KERNEL); + if (!work) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + INIT_LIST_HEAD(&work->w_list); + memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg)); + + mlog(0, "scheduling vote request:\n"); + mlog(0, "h_response_id = %u\n", + be32_to_cpu(work->w_msg.v_hdr.h_response_id)); + mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request)); + mlog(0, "h_blkno = %"MLFu64"\n", + be64_to_cpu(work->w_msg.v_hdr.h_blkno)); + mlog(0, "h_generation = %u\n", + be32_to_cpu(work->w_msg.v_hdr.h_generation)); + mlog(0, "h_node_num = %u\n", + be32_to_cpu(work->w_msg.v_hdr.h_node_num)); + mlog(0, "v_generic1 = %u\n", be32_to_cpu(work->w_msg.md1.v_generic1)); + + spin_lock(&osb->vote_task_lock); + list_add_tail(&work->w_list, &osb->vote_list); + osb->vote_count++; + spin_unlock(&osb->vote_task_lock); + + ocfs2_kick_vote_thread(osb); + + status = 0; +bail: + return status; +} + +void ocfs2_unregister_net_handlers(struct ocfs2_super *osb) +{ + if (!osb->net_key) + return; + + o2net_unregister_handler_list(&osb->osb_net_handlers); + + if (!list_empty(&osb->net_response_list)) + mlog(ML_ERROR, "net response list not empty!\n"); + + osb->net_key = 0; +} + +int ocfs2_register_net_handlers(struct ocfs2_super *osb) +{ + int status = 0; + + status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE, + osb->net_key, + sizeof(struct ocfs2_response_msg), + ocfs2_handle_response_message, + osb, &osb->osb_net_handlers); + if (status) { + mlog_errno(status); + goto bail; + } + + status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE, + osb->net_key, + sizeof(struct ocfs2_vote_msg), + ocfs2_handle_vote_message, + osb, &osb->osb_net_handlers); + if (status) { + mlog_errno(status); + goto bail; + } +bail: + if (status < 0) + ocfs2_unregister_net_handlers(osb); + + return status; +} diff --git a/fs/ocfs2/vote.h b/fs/ocfs2/vote.h new file mode 100644 index 0000000..9cce607 --- /dev/null +++ b/fs/ocfs2/vote.h @@ -0,0 +1,56 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * vote.h + * + * description here + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + + +#ifndef VOTE_H +#define VOTE_H + +int ocfs2_vote_thread(void *arg); +static inline void ocfs2_kick_vote_thread(struct ocfs2_super *osb) +{ + spin_lock(&osb->vote_task_lock); + /* make sure the voting thread gets a swipe at whatever changes + * the caller may have made to the voting state */ + osb->vote_wake_sequence++; + spin_unlock(&osb->vote_task_lock); + wake_up(&osb->vote_event); +} + +int ocfs2_request_delete_vote(struct inode *inode); +int ocfs2_request_unlink_vote(struct inode *inode, + struct dentry *dentry, + unsigned int nlink); +int ocfs2_request_rename_vote(struct inode *inode, + struct dentry *dentry); +int ocfs2_request_mount_vote(struct ocfs2_super *osb); +int ocfs2_request_umount_vote(struct ocfs2_super *osb); +int ocfs2_register_net_handlers(struct ocfs2_super *osb); +void ocfs2_unregister_net_handlers(struct ocfs2_super *osb); + +void ocfs2_mark_inode_remotely_deleted(struct inode *inode); + +void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb, + int node_num); +#endif diff --git a/include/linux/configfs.h b/include/linux/configfs.h new file mode 100644 index 0000000..acffb8c --- /dev/null +++ b/include/linux/configfs.h @@ -0,0 +1,205 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * configfs.h - definitions for the device driver filesystem + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * Based on sysfs: + * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel + * + * Based on kobject.h: + * Copyright (c) 2002-2003 Patrick Mochel + * Copyright (c) 2002-2003 Open Source Development Labs + * + * configfs Copyright (C) 2005 Oracle. All rights reserved. + * + * Please read Documentation/filesystems/configfs.txt before using the + * configfs interface, ESPECIALLY the parts about reference counts and + * item destructors. + */ + +#ifndef _CONFIGFS_H_ +#define _CONFIGFS_H_ + +#ifdef __KERNEL__ + +#include <linux/types.h> +#include <linux/list.h> +#include <linux/kref.h> + +#include <asm/atomic.h> +#include <asm/semaphore.h> + +#define CONFIGFS_ITEM_NAME_LEN 20 + +struct module; + +struct configfs_item_operations; +struct configfs_group_operations; +struct configfs_attribute; +struct configfs_subsystem; + +struct config_item { + char *ci_name; + char ci_namebuf[CONFIGFS_ITEM_NAME_LEN]; + struct kref ci_kref; + struct list_head ci_entry; + struct config_item *ci_parent; + struct config_group *ci_group; + struct config_item_type *ci_type; + struct dentry *ci_dentry; +}; + +extern int config_item_set_name(struct config_item *, const char *, ...); + +static inline char *config_item_name(struct config_item * item) +{ + return item->ci_name; +} + +extern void config_item_init(struct config_item *); +extern void config_item_init_type_name(struct config_item *item, + const char *name, + struct config_item_type *type); +extern void config_item_cleanup(struct config_item *); + +extern struct config_item * config_item_get(struct config_item *); +extern void config_item_put(struct config_item *); + +struct config_item_type { + struct module *ct_owner; + struct configfs_item_operations *ct_item_ops; + struct configfs_group_operations *ct_group_ops; + struct configfs_attribute **ct_attrs; +}; + + +/** + * group - a group of config_items of a specific type, belonging + * to a specific subsystem. + */ + +struct config_group { + struct config_item cg_item; + struct list_head cg_children; + struct configfs_subsystem *cg_subsys; + struct config_group **default_groups; +}; + + +extern void config_group_init(struct config_group *group); +extern void config_group_init_type_name(struct config_group *group, + const char *name, + struct config_item_type *type); + + +static inline struct config_group *to_config_group(struct config_item *item) +{ + return item ? container_of(item,struct config_group,cg_item) : NULL; +} + +static inline struct config_group *config_group_get(struct config_group *group) +{ + return group ? to_config_group(config_item_get(&group->cg_item)) : NULL; +} + +static inline void config_group_put(struct config_group *group) +{ + config_item_put(&group->cg_item); +} + +extern struct config_item *config_group_find_obj(struct config_group *, const char *); + + +struct configfs_attribute { + char *ca_name; + struct module *ca_owner; + mode_t ca_mode; +}; + + +/* + * If allow_link() exists, the item can symlink(2) out to other + * items. If the item is a group, it may support mkdir(2). + * Groups supply one of make_group() and make_item(). If the + * group supports make_group(), one can create group children. If it + * supports make_item(), one can create config_item children. If it has + * default_groups on group->default_groups, it has automatically created + * group children. default_groups may coexist alongsize make_group() or + * make_item(), but if the group wishes to have only default_groups + * children (disallowing mkdir(2)), it need not provide either function. + * If the group has commit(), it supports pending and commited (active) + * items. + */ +struct configfs_item_operations { + void (*release)(struct config_item *); + ssize_t (*show_attribute)(struct config_item *, struct configfs_attribute *,char *); + ssize_t (*store_attribute)(struct config_item *,struct configfs_attribute *,const char *, size_t); + int (*allow_link)(struct config_item *src, struct config_item *target); + int (*drop_link)(struct config_item *src, struct config_item *target); +}; + +struct configfs_group_operations { + struct config_item *(*make_item)(struct config_group *group, const char *name); + struct config_group *(*make_group)(struct config_group *group, const char *name); + int (*commit_item)(struct config_item *item); + void (*drop_item)(struct config_group *group, struct config_item *item); +}; + + + +/** + * Use these macros to make defining attributes easier. See include/linux/device.h + * for examples.. + */ + +#if 0 +#define __ATTR(_name,_mode,_show,_store) { \ + .attr = {.ca_name = __stringify(_name), .ca_mode = _mode, .ca_owner = THIS_MODULE }, \ + .show = _show, \ + .store = _store, \ +} + +#define __ATTR_RO(_name) { \ + .attr = { .ca_name = __stringify(_name), .ca_mode = 0444, .ca_owner = THIS_MODULE }, \ + .show = _name##_show, \ +} + +#define __ATTR_NULL { .attr = { .name = NULL } } + +#define attr_name(_attr) (_attr).attr.name +#endif + + +struct configfs_subsystem { + struct config_group su_group; + struct semaphore su_sem; +}; + +static inline struct configfs_subsystem *to_configfs_subsystem(struct config_group *group) +{ + return group ? + container_of(group, struct configfs_subsystem, su_group) : + NULL; +} + +int configfs_register_subsystem(struct configfs_subsystem *subsys); +void configfs_unregister_subsystem(struct configfs_subsystem *subsys); + +#endif /* __KERNEL__ */ + +#endif /* _CONFIGFS_H_ */ diff --git a/include/linux/fs.h b/include/linux/fs.h index cc35b6a..ed9a41a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -302,6 +302,37 @@ struct iattr { */ #include <linux/quota.h> +/** + * enum positive_aop_returns - aop return codes with specific semantics + * + * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has + * completed, that the page is still locked, and + * should be considered active. The VM uses this hint + * to return the page to the active list -- it won't + * be a candidate for writeback again in the near + * future. Other callers must be careful to unlock + * the page if they get this return. Returned by + * writepage(); + * + * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has + * unlocked it and the page might have been truncated. + * The caller should back up to acquiring a new page and + * trying again. The aop will be taking reasonable + * precautions not to livelock. If the caller held a page + * reference, it should drop it before retrying. Returned + * by readpage(), prepare_write(), and commit_write(). + * + * address_space_operation functions return these large constants to indicate + * special semantics to the caller. These are much larger than the bytes in a + * page to allow for functions that return the number of bytes operated on in a + * given page. + */ + +enum positive_aop_returns { + AOP_WRITEPAGE_ACTIVATE = 0x80000, + AOP_TRUNCATED_PAGE = 0x80001, +}; + /* * oh the beauties of C type declarations. */ diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 343d883..64a36ba 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -60,12 +60,6 @@ struct writeback_control { }; /* - * ->writepage() return values (make these much larger than a pagesize, in - * case some fs is returning number-of-bytes-written from writepage) - */ -#define WRITEPAGE_ACTIVATE 0x80000 /* IO was not started: activate page */ - -/* * fs/fs-writeback.c */ void writeback_inodes(struct writeback_control *wbc); diff --git a/mm/filemap.c b/mm/filemap.c index 33a28bf..6e1d08a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -831,8 +831,13 @@ readpage: /* Start the actual read. The read will unlock the page. */ error = mapping->a_ops->readpage(filp, page); - if (unlikely(error)) + if (unlikely(error)) { + if (error == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto find_page; + } goto readpage_error; + } if (!PageUptodate(page)) { lock_page(page); @@ -1152,26 +1157,24 @@ static int fastcall page_cache_read(struct file * file, unsigned long offset) { struct address_space *mapping = file->f_mapping; struct page *page; - int error; + int ret; - page = page_cache_alloc_cold(mapping); - if (!page) - return -ENOMEM; + do { + page = page_cache_alloc_cold(mapping); + if (!page) + return -ENOMEM; + + ret = add_to_page_cache_lru(page, mapping, offset, GFP_KERNEL); + if (ret == 0) + ret = mapping->a_ops->readpage(file, page); + else if (ret == -EEXIST) + ret = 0; /* losing race to add is OK */ - error = add_to_page_cache_lru(page, mapping, offset, GFP_KERNEL); - if (!error) { - error = mapping->a_ops->readpage(file, page); page_cache_release(page); - return error; - } - /* - * We arrive here in the unlikely event that someone - * raced with us and added our page to the cache first - * or we are out of memory for radix-tree nodes. - */ - page_cache_release(page); - return error == -EEXIST ? 0 : error; + } while (ret == AOP_TRUNCATED_PAGE); + + return ret; } #define MMAP_LOTSAMISS (100) @@ -1331,10 +1334,14 @@ page_not_uptodate: goto success; } - if (!mapping->a_ops->readpage(file, page)) { + error = mapping->a_ops->readpage(file, page); + if (!error) { wait_on_page_locked(page); if (PageUptodate(page)) goto success; + } else if (error == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto retry_find; } /* @@ -1358,10 +1365,14 @@ page_not_uptodate: goto success; } ClearPageError(page); - if (!mapping->a_ops->readpage(file, page)) { + error = mapping->a_ops->readpage(file, page); + if (!error) { wait_on_page_locked(page); if (PageUptodate(page)) goto success; + } else if (error == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto retry_find; } /* @@ -1444,10 +1455,14 @@ page_not_uptodate: goto success; } - if (!mapping->a_ops->readpage(file, page)) { + error = mapping->a_ops->readpage(file, page); + if (!error) { wait_on_page_locked(page); if (PageUptodate(page)) goto success; + } else if (error == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto retry_find; } /* @@ -1470,10 +1485,14 @@ page_not_uptodate: } ClearPageError(page); - if (!mapping->a_ops->readpage(file, page)) { + error = mapping->a_ops->readpage(file, page); + if (!error) { wait_on_page_locked(page); if (PageUptodate(page)) goto success; + } else if (error == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto retry_find; } /* @@ -1934,12 +1953,16 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov, status = a_ops->prepare_write(file, page, offset, offset+bytes); if (unlikely(status)) { loff_t isize = i_size_read(inode); + + if (status != AOP_TRUNCATED_PAGE) + unlock_page(page); + page_cache_release(page); + if (status == AOP_TRUNCATED_PAGE) + continue; /* * prepare_write() may have instantiated a few blocks * outside i_size. Trim these off again. */ - unlock_page(page); - page_cache_release(page); if (pos + bytes > isize) vmtruncate(inode, isize); break; @@ -1952,6 +1975,10 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov, cur_iov, iov_base, bytes); flush_dcache_page(page); status = a_ops->commit_write(file, page, offset, offset+bytes); + if (status == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + continue; + } if (likely(copied > 0)) { if (!status) status = copied; diff --git a/mm/readahead.c b/mm/readahead.c index 72e7adb..8d6eeaa 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -158,7 +158,7 @@ static int read_pages(struct address_space *mapping, struct file *filp, { unsigned page_idx; struct pagevec lru_pvec; - int ret = 0; + int ret; if (mapping->a_ops->readpages) { ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages); @@ -171,14 +171,17 @@ static int read_pages(struct address_space *mapping, struct file *filp, list_del(&page->lru); if (!add_to_page_cache(page, mapping, page->index, GFP_KERNEL)) { - mapping->a_ops->readpage(filp, page); - if (!pagevec_add(&lru_pvec, page)) - __pagevec_lru_add(&lru_pvec); - } else { - page_cache_release(page); + ret = mapping->a_ops->readpage(filp, page); + if (ret != AOP_TRUNCATED_PAGE) { + if (!pagevec_add(&lru_pvec, page)) + __pagevec_lru_add(&lru_pvec); + continue; + } /* else fall through to release */ } + page_cache_release(page); } pagevec_lru_add(&lru_pvec); + ret = 0; out: return ret; } @@ -855,7 +855,7 @@ unlock: swap_free(swap); redirty: set_page_dirty(page); - return WRITEPAGE_ACTIVATE; /* Return with the page locked */ + return AOP_WRITEPAGE_ACTIVATE; /* Return with the page locked */ } #ifdef CONFIG_NUMA diff --git a/mm/vmscan.c b/mm/vmscan.c index b0cd81c..795a050 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -367,7 +367,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping) res = mapping->a_ops->writepage(page, &wbc); if (res < 0) handle_write_error(mapping, page, res); - if (res == WRITEPAGE_ACTIVATE) { + if (res == AOP_WRITEPAGE_ACTIVATE) { ClearPageReclaim(page); return PAGE_ACTIVATE; } |
