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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/obdclass/linux/linux-module.c
*
* Object Devices Class Driver
* These are the only exported functions, they provide some generic
* infrastructure for managing object devices
*/
#define DEBUG_SUBSYSTEM S_CLASS
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/lp.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/list.h>
#include <linux/highmem.h>
#include <linux/io.h>
#include <asm/ioctls.h>
#include <linux/poll.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/seq_file.h>
#include <linux/kobject.h>
#include "../../../include/linux/libcfs/libcfs.h"
#include "../../../include/linux/lnet/lnetctl.h"
#include "../../include/obd_support.h"
#include "../../include/obd_class.h"
#include "../../include/lprocfs_status.h"
#include "../../include/lustre_ver.h"
#include "../../include/lustre/lustre_build_version.h"
int proc_version;
/* buffer MUST be at least the size of obd_ioctl_hdr */
int obd_ioctl_getdata(char **buf, int *len, void *arg)
{
struct obd_ioctl_hdr hdr;
struct obd_ioctl_data *data;
int err;
int offset = 0;
if (copy_from_user(&hdr, (void *)arg, sizeof(hdr)))
return -EFAULT;
if (hdr.ioc_version != OBD_IOCTL_VERSION) {
CERROR("Version mismatch kernel (%x) vs application (%x)\n",
OBD_IOCTL_VERSION, hdr.ioc_version);
return -EINVAL;
}
if (hdr.ioc_len > OBD_MAX_IOCTL_BUFFER) {
CERROR("User buffer len %d exceeds %d max buffer\n",
hdr.ioc_len, OBD_MAX_IOCTL_BUFFER);
return -EINVAL;
}
if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
CERROR("User buffer too small for ioctl (%d)\n", hdr.ioc_len);
return -EINVAL;
}
/* When there are lots of processes calling vmalloc on multi-core
* system, the high lock contention will hurt performance badly,
* obdfilter-survey is an example, which relies on ioctl. So we'd
* better avoid vmalloc on ioctl path. LU-66 */
OBD_ALLOC_LARGE(*buf, hdr.ioc_len);
if (*buf == NULL) {
CERROR("Cannot allocate control buffer of len %d\n",
hdr.ioc_len);
return -EINVAL;
}
*len = hdr.ioc_len;
data = (struct obd_ioctl_data *)*buf;
if (copy_from_user(*buf, (void *)arg, hdr.ioc_len)) {
err = -EFAULT;
goto free_buf;
}
if (hdr.ioc_len != data->ioc_len) {
err = -EINVAL;
goto free_buf;
}
if (obd_ioctl_is_invalid(data)) {
CERROR("ioctl not correctly formatted\n");
err = -EINVAL;
goto free_buf;
}
if (data->ioc_inllen1) {
data->ioc_inlbuf1 = &data->ioc_bulk[0];
offset += cfs_size_round(data->ioc_inllen1);
}
if (data->ioc_inllen2) {
data->ioc_inlbuf2 = &data->ioc_bulk[0] + offset;
offset += cfs_size_round(data->ioc_inllen2);
}
if (data->ioc_inllen3) {
data->ioc_inlbuf3 = &data->ioc_bulk[0] + offset;
offset += cfs_size_round(data->ioc_inllen3);
}
if (data->ioc_inllen4) {
data->ioc_inlbuf4 = &data->ioc_bulk[0] + offset;
}
return 0;
free_buf:
OBD_FREE_LARGE(*buf, hdr.ioc_len);
return err;
}
EXPORT_SYMBOL(obd_ioctl_getdata);
int obd_ioctl_popdata(void *arg, void *data, int len)
{
int err;
err = copy_to_user(arg, data, len);
if (err)
err = -EFAULT;
return err;
}
EXPORT_SYMBOL(obd_ioctl_popdata);
/* opening /dev/obd */
static int obd_class_open(struct inode *inode, struct file *file)
{
try_module_get(THIS_MODULE);
return 0;
}
/* closing /dev/obd */
static int obd_class_release(struct inode *inode, struct file *file)
{
module_put(THIS_MODULE);
return 0;
}
/* to control /dev/obd */
static long obd_class_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int err = 0;
/* Allow non-root access for OBD_IOC_PING_TARGET - used by lfs check */
if (!capable(CFS_CAP_SYS_ADMIN) && (cmd != OBD_IOC_PING_TARGET))
return err = -EACCES;
if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
return err = -ENOTTY;
err = class_handle_ioctl(cmd, (unsigned long)arg);
return err;
}
/* declare character device */
static struct file_operations obd_psdev_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = obd_class_ioctl, /* unlocked_ioctl */
.open = obd_class_open, /* open */
.release = obd_class_release, /* release */
};
/* modules setup */
struct miscdevice obd_psdev = {
.minor = OBD_DEV_MINOR,
.name = OBD_DEV_NAME,
.fops = &obd_psdev_fops,
};
static ssize_t version_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", LUSTRE_VERSION_STRING);
}
static ssize_t pinger_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", "on");
}
static ssize_t health_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
bool healthy = true;
int i;
size_t len = 0;
if (libcfs_catastrophe)
return sprintf(buf, "LBUG\n");
read_lock(&obd_dev_lock);
for (i = 0; i < class_devno_max(); i++) {
struct obd_device *obd;
obd = class_num2obd(i);
if (obd == NULL || !obd->obd_attached || !obd->obd_set_up)
continue;
LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
if (obd->obd_stopping)
continue;
class_incref(obd, __func__, current);
read_unlock(&obd_dev_lock);
if (obd_health_check(NULL, obd)) {
healthy = false;
}
class_decref(obd, __func__, current);
read_lock(&obd_dev_lock);
}
read_unlock(&obd_dev_lock);
if (healthy)
len = sprintf(buf, "healthy\n");
else
len = sprintf(buf, "NOT HEALTHY\n");
return len;
}
static ssize_t jobid_var_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_var);
}
static ssize_t jobid_var_store(struct kobject *kobj, struct attribute *attr,
const char *buffer,
size_t count)
{
if (!count || count > JOBSTATS_JOBID_VAR_MAX_LEN)
return -EINVAL;
memset(obd_jobid_var, 0, JOBSTATS_JOBID_VAR_MAX_LEN + 1);
memcpy(obd_jobid_var, buffer, count);
/* Trim the trailing '\n' if any */
if (obd_jobid_var[count - 1] == '\n')
obd_jobid_var[count - 1] = 0;
return count;
}
static ssize_t jobid_name_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_node);
}
static ssize_t jobid_name_store(struct kobject *kobj, struct attribute *attr,
const char *buffer,
size_t count)
{
if (!count || count > JOBSTATS_JOBID_SIZE)
return -EINVAL;
memcpy(obd_jobid_node, buffer, count);
obd_jobid_node[count] = 0;
/* Trim the trailing '\n' if any */
if (obd_jobid_node[count - 1] == '\n')
obd_jobid_node[count - 1] = 0;
return count;
}
/* Root for /sys/kernel/debug/lustre */
struct dentry *debugfs_lustre_root;
EXPORT_SYMBOL_GPL(debugfs_lustre_root);
#if defined(CONFIG_PROC_FS)
/* Root for /proc/fs/lustre */
struct proc_dir_entry *proc_lustre_root = NULL;
EXPORT_SYMBOL(proc_lustre_root);
LUSTRE_RO_ATTR(version);
LUSTRE_RO_ATTR(pinger);
LUSTRE_RO_ATTR(health);
LUSTRE_RW_ATTR(jobid_var);
LUSTRE_RW_ATTR(jobid_name);
static struct attribute *lustre_attrs[] = {
&lustre_attr_version.attr,
&lustre_attr_pinger.attr,
&lustre_attr_health.attr,
&lustre_attr_jobid_name.attr,
&lustre_attr_jobid_var.attr,
NULL,
};
static void *obd_device_list_seq_start(struct seq_file *p, loff_t *pos)
{
if (*pos >= class_devno_max())
return NULL;
return pos;
}
static void obd_device_list_seq_stop(struct seq_file *p, void *v)
{
}
static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
{
++*pos;
if (*pos >= class_devno_max())
return NULL;
return pos;
}
static int obd_device_list_seq_show(struct seq_file *p, void *v)
{
loff_t index = *(loff_t *)v;
struct obd_device *obd = class_num2obd((int)index);
char *status;
if (obd == NULL)
return 0;
LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
if (obd->obd_stopping)
status = "ST";
else if (obd->obd_inactive)
status = "IN";
else if (obd->obd_set_up)
status = "UP";
else if (obd->obd_attached)
status = "AT";
else
status = "--";
seq_printf(p, "%3d %s %s %s %s %d\n",
(int)index, status, obd->obd_type->typ_name,
obd->obd_name, obd->obd_uuid.uuid,
atomic_read(&obd->obd_refcount));
return 0;
}
struct seq_operations obd_device_list_sops = {
.start = obd_device_list_seq_start,
.stop = obd_device_list_seq_stop,
.next = obd_device_list_seq_next,
.show = obd_device_list_seq_show,
};
static int obd_device_list_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
int rc = seq_open(file, &obd_device_list_sops);
if (rc)
return rc;
seq = file->private_data;
seq->private = PDE_DATA(inode);
return 0;
}
struct file_operations obd_device_list_fops = {
.owner = THIS_MODULE,
.open = obd_device_list_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
struct kobject *lustre_kobj;
EXPORT_SYMBOL_GPL(lustre_kobj);
static struct attribute_group lustre_attr_group = {
.attrs = lustre_attrs,
};
int class_procfs_init(void)
{
int rc = 0;
struct dentry *file;
lustre_kobj = kobject_create_and_add("lustre", fs_kobj);
if (lustre_kobj == NULL)
goto out;
/* Create the files associated with this kobject */
rc = sysfs_create_group(lustre_kobj, &lustre_attr_group);
if (rc) {
kobject_put(lustre_kobj);
goto out;
}
debugfs_lustre_root = debugfs_create_dir("lustre", NULL);
if (IS_ERR_OR_NULL(debugfs_lustre_root)) {
rc = debugfs_lustre_root ? PTR_ERR(debugfs_lustre_root)
: -ENOMEM;
debugfs_lustre_root = NULL;
kobject_put(lustre_kobj);
goto out;
}
file = debugfs_create_file("devices", 0444, debugfs_lustre_root, NULL,
&obd_device_list_fops);
if (IS_ERR_OR_NULL(file)) {
rc = file ? PTR_ERR(file) : -ENOMEM;
kobject_put(lustre_kobj);
goto out;
}
proc_lustre_root = lprocfs_register("fs/lustre", NULL, NULL, NULL);
if (IS_ERR(proc_lustre_root)) {
rc = PTR_ERR(proc_lustre_root);
proc_lustre_root = NULL;
kobject_put(lustre_kobj);
goto out;
}
rc = lprocfs_seq_create(proc_lustre_root, "devices", 0444,
&obd_device_list_fops, NULL);
out:
if (rc)
CERROR("error adding /proc/fs/lustre/devices file\n");
return rc;
}
int class_procfs_clean(void)
{
if (debugfs_lustre_root != NULL)
debugfs_remove_recursive(debugfs_lustre_root);
debugfs_lustre_root = NULL;
if (proc_lustre_root) {
lprocfs_remove(&proc_lustre_root);
}
kobject_put(lustre_kobj);
return 0;
}
#endif /* CONFIG_PROC_FS */
|