/* /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 <linux/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 = memdup_user_nul(buf, size); if (IS_ERR(kbuf)) return PTR_ERR(kbuf); /* 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; kbuf = memdup_user_nul(buf, size); if (IS_ERR(kbuf)) return PTR_ERR(kbuf); /* 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 */ kfree(kbuf); _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; }