diff options
Diffstat (limited to 'fs/afs/proc.c')
| -rw-r--r-- | fs/afs/proc.c | 666 |
1 files changed, 666 insertions, 0 deletions
diff --git a/fs/afs/proc.c b/fs/afs/proc.c new file mode 100644 index 000000000..24a905b07 --- /dev/null +++ b/fs/afs/proc.c @@ -0,0 +1,666 @@ +/* /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/slab.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/sched.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 const 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 const 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 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 const struct file_operations afs_proc_rootcell_fops = { + .read = afs_proc_rootcell_read, + .write = afs_proc_rootcell_write, + .llseek = no_llseek, +}; + +static int afs_proc_cell_volumes_open(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 const 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 const struct file_operations afs_proc_cell_volumes_fops = { + .open = afs_proc_cell_volumes_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int afs_proc_cell_vlservers_open(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 const 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 const struct file_operations afs_proc_cell_vlservers_fops = { + .open = afs_proc_cell_vlservers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int afs_proc_cell_servers_open(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 const 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 const struct file_operations afs_proc_cell_servers_fops = { + .open = afs_proc_cell_servers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +/* + * initialise the /proc/fs/afs/ directory + */ +int afs_proc_init(void) +{ + _enter(""); + + proc_afs = proc_mkdir("fs/afs", NULL); + if (!proc_afs) + goto error_dir; + + if (!proc_create("cells", 0644, proc_afs, &afs_proc_cells_fops) || + !proc_create("rootcell", 0644, proc_afs, &afs_proc_rootcell_fops)) + goto error_tree; + + _leave(" = 0"); + return 0; + +error_tree: + remove_proc_subtree("fs/afs", NULL); +error_dir: + _leave(" = -ENOMEM"); + return -ENOMEM; +} + +/* + * clean up the /proc/fs/afs/ directory + */ +void afs_proc_cleanup(void) +{ + remove_proc_subtree("fs/afs", NULL); +} + +/* + * 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_DATA(inode); + + return 0; +} + +/* + * 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) +{ + /* lock the list against modification */ + down_read(&afs_proc_cells_sem); + return seq_list_start_head(&afs_proc_cells, *_pos); +} + +/* + * move to next cell in cells list + */ +static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos) +{ + return seq_list_next(v, &afs_proc_cells, pos); +} + +/* + * 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); +} + +/* + * 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); + + if (v == &afs_proc_cells) { + /* display header on line 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; +} + +/* + * 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; + + cell = afs_cell_create(name, strlen(name), args, false); + if (IS_ERR(cell)) { + ret = PTR_ERR(cell); + goto done; + } + + afs_put_cell(cell); + 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; +} + +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; +} + +/* + * initialise /proc/fs/afs/<cell>/ + */ +int afs_proc_cell_setup(struct afs_cell *cell) +{ + struct proc_dir_entry *dir; + + _enter("%p{%s}", cell, cell->name); + + dir = proc_mkdir(cell->name, proc_afs); + if (!dir) + goto error_dir; + + if (!proc_create_data("servers", 0, dir, + &afs_proc_cell_servers_fops, cell) || + !proc_create_data("vlservers", 0, dir, + &afs_proc_cell_vlservers_fops, cell) || + !proc_create_data("volumes", 0, dir, + &afs_proc_cell_volumes_fops, cell)) + goto error_tree; + + _leave(" = 0"); + return 0; + +error_tree: + remove_proc_subtree(cell->name, proc_afs); +error_dir: + _leave(" = -ENOMEM"); + return -ENOMEM; +} + +/* + * remove /proc/fs/afs/<cell>/ + */ +void afs_proc_cell_remove(struct afs_cell *cell) +{ + _enter(""); + + remove_proc_subtree(cell->name, proc_afs); + + _leave(""); +} + +/* + * 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 = PDE_DATA(inode); + 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; +} + +/* + * 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 afs_cell *cell = m->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + /* lock the list against modification */ + down_read(&cell->vl_sem); + return seq_list_start_head(&cell->vl_list, *_pos); +} + +/* + * move to next cell in cells list + */ +static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, + loff_t *_pos) +{ + struct afs_cell *cell = p->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + return seq_list_next(v, &cell->vl_list, _pos); +} + +/* + * 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); +} + +static const char afs_vlocation_states[][4] = { + [AFS_VL_NEW] = "New", + [AFS_VL_CREATING] = "Crt", + [AFS_VL_VALID] = "Val", + [AFS_VL_NO_VOLUME] = "NoV", + [AFS_VL_UPDATING] = "Upd", + [AFS_VL_VOLUME_DELETED] = "Del", + [AFS_VL_UNCERTAIN] = "Unc", +}; + +/* + * 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_cell *cell = m->private; + struct afs_vlocation *vlocation = + list_entry(v, struct afs_vlocation, link); + + /* display header on line 1 */ + if (v == &cell->vl_list) { + seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + seq_printf(m, "%3d %s %08x %08x %08x %s\n", + atomic_read(&vlocation->usage), + afs_vlocation_states[vlocation->state], + vlocation->vldb.vid[0], + vlocation->vldb.vid[1], + vlocation->vldb.vid[2], + vlocation->vldb.name); + + return 0; +} + +/* + * 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 = PDE_DATA(inode); + 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; +} + +/* + * 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]; +} + +/* + * 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]; +} + +/* + * 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); +} + +/* + * 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, "%pI4\n", &addr->s_addr); + return 0; +} + +/* + * 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 = PDE_DATA(inode); + 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; +} + +/* + * 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) + __acquires(m->private->servers_lock) +{ + struct afs_cell *cell = m->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + + /* lock the list against modification */ + read_lock(&cell->servers_lock); + return seq_list_start_head(&cell->servers, *_pos); +} + +/* + * move to next cell in cells list + */ +static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, + loff_t *_pos) +{ + struct afs_cell *cell = p->private; + + _enter("cell=%p pos=%Ld", cell, *_pos); + return seq_list_next(v, &cell->servers, _pos); +} + +/* + * clean up after reading from the cells list + */ +static void afs_proc_cell_servers_stop(struct seq_file *p, void *v) + __releases(p->private->servers_lock) +{ + struct afs_cell *cell = p->private; + + read_unlock(&cell->servers_lock); +} + +/* + * 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_cell *cell = m->private; + struct afs_server *server = list_entry(v, struct afs_server, link); + char ipaddr[20]; + + /* display header on line 1 */ + if (v == &cell->servers) { + seq_puts(m, "USE ADDR STATE\n"); + return 0; + } + + /* display one cell per line on subsequent lines */ + sprintf(ipaddr, "%pI4", &server->addr); + seq_printf(m, "%3d %-15.15s %5d\n", + atomic_read(&server->usage), ipaddr, server->fs_state); + + return 0; +} |