diff options
Diffstat (limited to 'fs/afs/proc.c')
| -rw-r--r-- | fs/afs/proc.c | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/fs/afs/proc.c b/fs/afs/proc.c new file mode 100644 index 0000000..9c81b8f --- /dev/null +++ b/fs/afs/proc.c @@ -0,0 +1,857 @@ +/* proc.c: /proc interface for AFS + * + * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * 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. + */ + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include "cell.h" +#include "volume.h" +#include <asm/uaccess.h> +#include "internal.h" + +static struct proc_dir_entry *proc_afs; + + +static int afs_proc_cells_open(struct inode *inode, struct file *file); +static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos); +static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos); +static void afs_proc_cells_stop(struct seq_file *p, void *v); +static int afs_proc_cells_show(struct seq_file *m, void *v); +static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, + size_t size, loff_t *_pos); + +static struct seq_operations afs_proc_cells_ops = { + .start = afs_proc_cells_start, + .next = afs_proc_cells_next, + .stop = afs_proc_cells_stop, + .show = afs_proc_cells_show, +}; + +static struct file_operations afs_proc_cells_fops = { + .open = afs_proc_cells_open, + .read = seq_read, + .write = afs_proc_cells_write, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int afs_proc_rootcell_open(struct inode *inode, struct file *file); +static int afs_proc_rootcell_release(struct inode *inode, struct file *file); +static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, + size_t size, loff_t *_pos); +static ssize_t afs_proc_rootcell_write(struct file *file, + const char __user *buf, + size_t size, loff_t *_pos); + +static struct file_operations afs_proc_rootcell_fops = { + .open = afs_proc_rootcell_open, + .read = afs_proc_rootcell_read, + .write = afs_proc_rootcell_write, + .llseek = no_llseek, + .release = afs_proc_rootcell_release +}; + +static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file); +static int afs_proc_cell_volumes_release(struct inode *inode, + struct file *file); +static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos); +static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, + loff_t *pos); +static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v); +static int afs_proc_cell_volumes_show(struct seq_file *m, void *v); + +static struct seq_operations afs_proc_cell_volumes_ops = { + .start = afs_proc_cell_volumes_start, + .next = afs_proc_cell_volumes_next, + .stop = afs_proc_cell_volumes_stop, + .show = afs_proc_cell_volumes_show, +}; + +static struct file_operations afs_proc_cell_volumes_fops = { + .open = afs_proc_cell_volumes_open, + .read = seq_read, + .llseek = seq_lseek, + .release = afs_proc_cell_volumes_release, +}; + +static int afs_proc_cell_vlservers_open(struct inode *inode, + struct file *file); +static int afs_proc_cell_vlservers_release(struct inode *inode, + struct file *file); +static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos); +static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, + loff_t *pos); +static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v); +static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v); + +static struct seq_operations afs_proc_cell_vlservers_ops = { + .start = afs_proc_cell_vlservers_start, + .next = afs_proc_cell_vlservers_next, + .stop = afs_proc_cell_vlservers_stop, + .show = afs_proc_cell_vlservers_show, +}; + +static struct file_operations afs_proc_cell_vlservers_fops = { + .open = afs_proc_cell_vlservers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = afs_proc_cell_vlservers_release, +}; + +static int afs_proc_cell_servers_open(struct inode *inode, struct file *file); +static int afs_proc_cell_servers_release(struct inode *inode, + struct file *file); +static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos); +static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, + loff_t *pos); +static void afs_proc_cell_servers_stop(struct seq_file *p, void *v); +static int afs_proc_cell_servers_show(struct seq_file *m, void *v); + +static struct seq_operations afs_proc_cell_servers_ops = { + .start = afs_proc_cell_servers_start, + .next = afs_proc_cell_servers_next, + .stop = afs_proc_cell_servers_stop, + .show = afs_proc_cell_servers_show, +}; + +static struct file_operations afs_proc_cell_servers_fops = { + .open = afs_proc_cell_servers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = afs_proc_cell_servers_release, +}; + +/*****************************************************************************/ +/* + * initialise the /proc/fs/afs/ directory + */ +int afs_proc_init(void) +{ + struct proc_dir_entry *p; + + _enter(""); + + proc_afs = proc_mkdir("fs/afs", NULL); + if (!proc_afs) + goto error; + proc_afs->owner = THIS_MODULE; + + p = create_proc_entry("cells", 0, proc_afs); + if (!p) + goto error_proc; + p->proc_fops = &afs_proc_cells_fops; + p->owner = THIS_MODULE; + + p = create_proc_entry("rootcell", 0, proc_afs); + if (!p) + goto error_cells; + p->proc_fops = &afs_proc_rootcell_fops; + p->owner = THIS_MODULE; + + _leave(" = 0"); + return 0; + + error_cells: + remove_proc_entry("cells", proc_afs); + error_proc: + remove_proc_entry("fs/afs", NULL); + error: + _leave(" = -ENOMEM"); + return -ENOMEM; + +} /* end afs_proc_init() */ + +/*****************************************************************************/ +/* + * clean up the /proc/fs/afs/ directory + */ +void afs_proc_cleanup(void) +{ + remove_proc_entry("cells", proc_afs); + + remove_proc_entry("fs/afs", NULL); + +} /* end afs_proc_cleanup() */ + +/*****************************************************************************/ +/* + * open "/proc/fs/afs/cells" which provides a summary of extant cells + */ +static int afs_proc_cells_open(struct inode *inode, struct file *file) +{ + struct seq_file *m; + int ret; + + ret = seq_open(file, &afs_proc_cells_ops); + if (ret < 0) + return ret; + + m = file->private_data; + m->private = PDE(inode)->data; + + return 0; +} /* end afs_proc_cells_open() */ + +/*****************************************************************************/ +/* + * set up the iterator to start reading from the cells list and return the + * first item + */ +static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) +{ + struct list_head *_p; + loff_t pos = *_pos; + + /* lock the list against modification */ + down_read(&afs_proc_cells_sem); + + /* allow for the header line */ + if (!pos) + return (void *) 1; + pos--; + + /* find the n'th element in the list */ + list_for_each(_p, &afs_proc_cells) + if (!pos--) + break; + + return _p != &afs_proc_cells ? _p : NULL; +} /* end afs_proc_cells_start() */ + +/*****************************************************************************/ +/* + * move to next cell in cells list + */ +static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos) +{ + struct list_head *_p; + + (*pos)++; + + _p = v; + _p = v == (void *) 1 ? afs_proc_cells.next : _p->next; + + return _p != &afs_proc_cells ? _p : NULL; +} /* end afs_proc_cells_next() */ + +/*****************************************************************************/ +/* + * clean up after reading from the cells list + */ +static void afs_proc_cells_stop(struct seq_file *p, void *v) +{ + up_read(&afs_proc_cells_sem); + +} /* end afs_proc_cells_stop() */ + +/*****************************************************************************/ +/* + * display a header line followed by a load of cell lines + */ +static int afs_proc_cells_show(struct seq_file *m, void *v) +{ + struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link); + + /* display header on line 1 */ + if (v == (void *) 1) { + seq_puts(m, "USE NAME\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + seq_printf(m, "%3d %s\n", atomic_read(&cell->usage), cell->name); + + return 0; +} /* end afs_proc_cells_show() */ + +/*****************************************************************************/ +/* + * handle writes to /proc/fs/afs/cells + * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]" + */ +static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, + size_t size, loff_t *_pos) +{ + char *kbuf, *name, *args; + int ret; + + /* start by dragging the command into memory */ + if (size <= 1 || size >= PAGE_SIZE) + return -EINVAL; + + kbuf = kmalloc(size + 1, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + ret = -EFAULT; + if (copy_from_user(kbuf, buf, size) != 0) + goto done; + kbuf[size] = 0; + + /* trim to first NL */ + name = memchr(kbuf, '\n', size); + if (name) + *name = 0; + + /* split into command, name and argslist */ + name = strchr(kbuf, ' '); + if (!name) + goto inval; + do { + *name++ = 0; + } while(*name == ' '); + if (!*name) + goto inval; + + args = strchr(name, ' '); + if (!args) + goto inval; + do { + *args++ = 0; + } while(*args == ' '); + if (!*args) + goto inval; + + /* determine command to perform */ + _debug("cmd=%s name=%s args=%s", kbuf, name, args); + + if (strcmp(kbuf, "add") == 0) { + struct afs_cell *cell; + ret = afs_cell_create(name, args, &cell); + if (ret < 0) + goto done; + + printk("kAFS: Added new cell '%s'\n", name); + } + else { + goto inval; + } + + ret = size; + + done: + kfree(kbuf); + _leave(" = %d", ret); + return ret; + + inval: + ret = -EINVAL; + printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); + goto done; +} /* end afs_proc_cells_write() */ + +/*****************************************************************************/ +/* + * Stubs for /proc/fs/afs/rootcell + */ +static int afs_proc_rootcell_open(struct inode *inode, struct file *file) +{ + return 0; +} + +static int afs_proc_rootcell_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, + size_t size, loff_t *_pos) +{ + return 0; +} + +/*****************************************************************************/ +/* + * handle writes to /proc/fs/afs/rootcell + * - to initialize rootcell: echo "cell.name:192.168.231.14" + */ +static ssize_t afs_proc_rootcell_write(struct file *file, + const char __user *buf, + size_t size, loff_t *_pos) +{ + char *kbuf, *s; + int ret; + + /* start by dragging the command into memory */ + if (size <= 1 || size >= PAGE_SIZE) + return -EINVAL; + + ret = -ENOMEM; + kbuf = kmalloc(size + 1, GFP_KERNEL); + if (!kbuf) + goto nomem; + + ret = -EFAULT; + if (copy_from_user(kbuf, buf, size) != 0) + goto infault; + kbuf[size] = 0; + + /* trim to first NL */ + s = memchr(kbuf, '\n', size); + if (s) + *s = 0; + + /* determine command to perform */ + _debug("rootcell=%s", kbuf); + + ret = afs_cell_init(kbuf); + if (ret >= 0) + ret = size; /* consume everything, always */ + + infault: + kfree(kbuf); + nomem: + _leave(" = %d", ret); + return ret; +} /* end afs_proc_rootcell_write() */ + +/*****************************************************************************/ +/* + * initialise /proc/fs/afs/<cell>/ + */ +int afs_proc_cell_setup(struct afs_cell *cell) +{ + struct proc_dir_entry *p; + + _enter("%p{%s}", cell, cell->name); + + cell->proc_dir = proc_mkdir(cell->name, proc_afs); + if (!cell->proc_dir) + return -ENOMEM; + + p = create_proc_entry("servers", 0, cell->proc_dir); + if (!p) + goto error_proc; + p->proc_fops = &afs_proc_cell_servers_fops; + p->owner = THIS_MODULE; + p->data = cell; + + p = create_proc_entry("vlservers", 0, cell->proc_dir); + if (!p) + goto error_servers; + p->proc_fops = &afs_proc_cell_vlservers_fops; + p->owner = THIS_MODULE; + p->data = cell; + + p = create_proc_entry("volumes", 0, cell->proc_dir); + if (!p) + goto error_vlservers; + p->proc_fops = &afs_proc_cell_volumes_fops; + p->owner = THIS_MODULE; + p->data = cell; + + _leave(" = 0"); + return 0; + + error_vlservers: + remove_proc_entry("vlservers", cell->proc_dir); + error_servers: + remove_proc_entry("servers", cell->proc_dir); + error_proc: + remove_proc_entry(cell->name, proc_afs); + _leave(" = -ENOMEM"); + return -ENOMEM; +} /* end afs_proc_cell_setup() */ + +/*****************************************************************************/ +/* + * remove /proc/fs/afs/<cell>/ + */ +void afs_proc_cell_remove(struct afs_cell *cell) +{ + _enter(""); + + remove_proc_entry("volumes", cell->proc_dir); + remove_proc_entry("vlservers", cell->proc_dir); + remove_proc_entry("servers", cell->proc_dir); + remove_proc_entry(cell->name, proc_afs); + + _leave(""); +} /* end afs_proc_cell_remove() */ + +/*****************************************************************************/ +/* + * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells + */ +static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file) +{ + struct afs_cell *cell; + struct seq_file *m; + int ret; + + cell = afs_get_cell_maybe((struct afs_cell **) &PDE(inode)->data); + if (!cell) + return -ENOENT; + + ret = seq_open(file, &afs_proc_cell_volumes_ops); + if (ret < 0) + return ret; + + m = file->private_data; + m->private = cell; + + return 0; +} /* end afs_proc_cell_volumes_open() */ + +/*****************************************************************************/ +/* + * close the file and release the ref to the cell + */ +static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file) +{ + struct afs_cell *cell = PDE(inode)->data; + int ret; + + ret = seq_release(inode,file); + + afs_put_cell(cell); + + return ret; +} /* end afs_proc_cell_volumes_release() */ + +/*****************************************************************************/ +/* + * set up the iterator to start reading from the cells list and return the + * first item + */ +static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) +{ + struct list_head *_p; + struct afs_cell *cell = m->private; + loff_t pos = *_pos; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + /* lock the list against modification */ + down_read(&cell->vl_sem); + + /* allow for the header line */ + if (!pos) + return (void *) 1; + pos--; + + /* find the n'th element in the list */ + list_for_each(_p, &cell->vl_list) + if (!pos--) + break; + + return _p != &cell->vl_list ? _p : NULL; +} /* end afs_proc_cell_volumes_start() */ + +/*****************************************************************************/ +/* + * move to next cell in cells list + */ +static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, + loff_t *_pos) +{ + struct list_head *_p; + struct afs_cell *cell = p->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + (*_pos)++; + + _p = v; + _p = v == (void *) 1 ? cell->vl_list.next : _p->next; + + return _p != &cell->vl_list ? _p : NULL; +} /* end afs_proc_cell_volumes_next() */ + +/*****************************************************************************/ +/* + * clean up after reading from the cells list + */ +static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v) +{ + struct afs_cell *cell = p->private; + + up_read(&cell->vl_sem); + +} /* end afs_proc_cell_volumes_stop() */ + +/*****************************************************************************/ +/* + * display a header line followed by a load of volume lines + */ +static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) +{ + struct afs_vlocation *vlocation = + list_entry(v, struct afs_vlocation, link); + + /* display header on line 1 */ + if (v == (void *) 1) { + seq_puts(m, "USE VLID[0] VLID[1] VLID[2] NAME\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + seq_printf(m, "%3d %08x %08x %08x %s\n", + atomic_read(&vlocation->usage), + vlocation->vldb.vid[0], + vlocation->vldb.vid[1], + vlocation->vldb.vid[2], + vlocation->vldb.name + ); + + return 0; +} /* end afs_proc_cell_volumes_show() */ + +/*****************************************************************************/ +/* + * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume + * location server + */ +static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file) +{ + struct afs_cell *cell; + struct seq_file *m; + int ret; + + cell = afs_get_cell_maybe((struct afs_cell**)&PDE(inode)->data); + if (!cell) + return -ENOENT; + + ret = seq_open(file,&afs_proc_cell_vlservers_ops); + if (ret<0) + return ret; + + m = file->private_data; + m->private = cell; + + return 0; +} /* end afs_proc_cell_vlservers_open() */ + +/*****************************************************************************/ +/* + * close the file and release the ref to the cell + */ +static int afs_proc_cell_vlservers_release(struct inode *inode, + struct file *file) +{ + struct afs_cell *cell = PDE(inode)->data; + int ret; + + ret = seq_release(inode,file); + + afs_put_cell(cell); + + return ret; +} /* end afs_proc_cell_vlservers_release() */ + +/*****************************************************************************/ +/* + * set up the iterator to start reading from the cells list and return the + * first item + */ +static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) +{ + struct afs_cell *cell = m->private; + loff_t pos = *_pos; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + /* lock the list against modification */ + down_read(&cell->vl_sem); + + /* allow for the header line */ + if (!pos) + return (void *) 1; + pos--; + + if (pos >= cell->vl_naddrs) + return NULL; + + return &cell->vl_addrs[pos]; +} /* end afs_proc_cell_vlservers_start() */ + +/*****************************************************************************/ +/* + * move to next cell in cells list + */ +static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, + loff_t *_pos) +{ + struct afs_cell *cell = p->private; + loff_t pos; + + _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos); + + pos = *_pos; + (*_pos)++; + if (pos >= cell->vl_naddrs) + return NULL; + + return &cell->vl_addrs[pos]; +} /* end afs_proc_cell_vlservers_next() */ + +/*****************************************************************************/ +/* + * clean up after reading from the cells list + */ +static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v) +{ + struct afs_cell *cell = p->private; + + up_read(&cell->vl_sem); + +} /* end afs_proc_cell_vlservers_stop() */ + +/*****************************************************************************/ +/* + * display a header line followed by a load of volume lines + */ +static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) +{ + struct in_addr *addr = v; + + /* display header on line 1 */ + if (v == (struct in_addr *) 1) { + seq_puts(m, "ADDRESS\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + seq_printf(m, "%u.%u.%u.%u\n", NIPQUAD(addr->s_addr)); + + return 0; +} /* end afs_proc_cell_vlservers_show() */ + +/*****************************************************************************/ +/* + * open "/proc/fs/afs/<cell>/servers" which provides a summary of active + * servers + */ +static int afs_proc_cell_servers_open(struct inode *inode, struct file *file) +{ + struct afs_cell *cell; + struct seq_file *m; + int ret; + + cell = afs_get_cell_maybe((struct afs_cell **) &PDE(inode)->data); + if (!cell) + return -ENOENT; + + ret = seq_open(file, &afs_proc_cell_servers_ops); + if (ret < 0) + return ret; + + m = file->private_data; + m->private = cell; + + return 0; +} /* end afs_proc_cell_servers_open() */ + +/*****************************************************************************/ +/* + * close the file and release the ref to the cell + */ +static int afs_proc_cell_servers_release(struct inode *inode, + struct file *file) +{ + struct afs_cell *cell = PDE(inode)->data; + int ret; + + ret = seq_release(inode, file); + + afs_put_cell(cell); + + return ret; +} /* end afs_proc_cell_servers_release() */ + +/*****************************************************************************/ +/* + * set up the iterator to start reading from the cells list and return the + * first item + */ +static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos) +{ + struct list_head *_p; + struct afs_cell *cell = m->private; + loff_t pos = *_pos; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + /* lock the list against modification */ + read_lock(&cell->sv_lock); + + /* allow for the header line */ + if (!pos) + return (void *) 1; + pos--; + + /* find the n'th element in the list */ + list_for_each(_p, &cell->sv_list) + if (!pos--) + break; + + return _p != &cell->sv_list ? _p : NULL; +} /* end afs_proc_cell_servers_start() */ + +/*****************************************************************************/ +/* + * move to next cell in cells list + */ +static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, + loff_t *_pos) +{ + struct list_head *_p; + struct afs_cell *cell = p->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + (*_pos)++; + + _p = v; + _p = v == (void *) 1 ? cell->sv_list.next : _p->next; + + return _p != &cell->sv_list ? _p : NULL; +} /* end afs_proc_cell_servers_next() */ + +/*****************************************************************************/ +/* + * clean up after reading from the cells list + */ +static void afs_proc_cell_servers_stop(struct seq_file *p, void *v) +{ + struct afs_cell *cell = p->private; + + read_unlock(&cell->sv_lock); + +} /* end afs_proc_cell_servers_stop() */ + +/*****************************************************************************/ +/* + * display a header line followed by a load of volume lines + */ +static int afs_proc_cell_servers_show(struct seq_file *m, void *v) +{ + struct afs_server *server = list_entry(v, struct afs_server, link); + char ipaddr[20]; + + /* display header on line 1 */ + if (v == (void *) 1) { + seq_puts(m, "USE ADDR STATE\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(server->addr)); + seq_printf(m, "%3d %-15.15s %5d\n", + atomic_read(&server->usage), + ipaddr, + server->fs_state + ); + + return 0; +} /* end afs_proc_cell_servers_show() */ |
