1 /* /proc interface for AFS
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/proc_fs.h>
15 #include <linux/seq_file.h>
16 #include <linux/sched.h>
17 #include <linux/uaccess.h>
20 static inline struct afs_net *afs_seq2net(struct seq_file *m)
22 return afs_net(seq_file_net(m));
25 static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
27 return afs_net(seq_file_single_net(m));
31 * Display the list of cells known to the namespace.
33 static int afs_proc_cells_show(struct seq_file *m, void *v)
35 struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
36 struct afs_net *net = afs_seq2net(m);
38 if (v == &net->proc_cells) {
39 /* display header on line 1 */
40 seq_puts(m, "USE NAME\n");
44 /* display one cell per line on subsequent lines */
45 seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
49 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
53 return seq_list_start_head(&afs_seq2net(m)->proc_cells, *_pos);
56 static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
58 return seq_list_next(v, &afs_seq2net(m)->proc_cells, pos);
61 static void afs_proc_cells_stop(struct seq_file *m, void *v)
67 static const struct seq_operations afs_proc_cells_ops = {
68 .start = afs_proc_cells_start,
69 .next = afs_proc_cells_next,
70 .stop = afs_proc_cells_stop,
71 .show = afs_proc_cells_show,
75 * handle writes to /proc/fs/afs/cells
76 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
78 static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
80 struct seq_file *m = file->private_data;
81 struct afs_net *net = afs_seq2net(m);
85 /* trim to first NL */
86 name = memchr(buf, '\n', size);
90 /* split into command, name and argslist */
91 name = strchr(buf, ' ');
96 } while(*name == ' ');
100 args = strchr(name, ' ');
104 } while(*args == ' ');
109 /* determine command to perform */
110 _debug("cmd=%s name=%s args=%s", buf, name, args);
112 if (strcmp(buf, "add") == 0) {
113 struct afs_cell *cell;
115 cell = afs_lookup_cell(net, name, strlen(name), args, true);
121 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
122 afs_put_cell(net, cell);
130 _leave(" = %d", ret);
135 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
140 * Display the name of the current workstation cell.
142 static int afs_proc_rootcell_show(struct seq_file *m, void *v)
144 struct afs_cell *cell;
147 net = afs_seq2net_single(m);
148 if (rcu_access_pointer(net->ws_cell)) {
150 cell = rcu_dereference(net->ws_cell);
152 seq_printf(m, "%s\n", cell->name);
159 * Set the current workstation cell and optionally supply its list of volume
162 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
164 static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
166 struct seq_file *m = file->private_data;
167 struct afs_net *net = afs_seq2net_single(m);
174 if (memchr(buf, '/', size))
177 /* trim to first NL */
178 s = memchr(buf, '\n', size);
182 /* determine command to perform */
183 _debug("rootcell=%s", buf);
185 ret = afs_cell_init(net, buf);
188 _leave(" = %d", ret);
192 static const char afs_vol_types[3][3] = {
193 [AFSVL_RWVOL] = "RW",
194 [AFSVL_ROVOL] = "RO",
195 [AFSVL_BACKVOL] = "BK",
199 * Display the list of volumes known to a cell.
201 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
203 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
204 struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
206 /* Display header on line 1 */
207 if (v == &cell->proc_volumes) {
208 seq_puts(m, "USE VID TY\n");
212 seq_printf(m, "%3d %08x %s\n",
213 atomic_read(&vol->usage), vol->vid,
214 afs_vol_types[vol->type]);
219 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
220 __acquires(cell->proc_lock)
222 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
224 read_lock(&cell->proc_lock);
225 return seq_list_start_head(&cell->proc_volumes, *_pos);
228 static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
231 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
233 return seq_list_next(v, &cell->proc_volumes, _pos);
236 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
237 __releases(cell->proc_lock)
239 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
241 read_unlock(&cell->proc_lock);
244 static const struct seq_operations afs_proc_cell_volumes_ops = {
245 .start = afs_proc_cell_volumes_start,
246 .next = afs_proc_cell_volumes_next,
247 .stop = afs_proc_cell_volumes_stop,
248 .show = afs_proc_cell_volumes_show,
252 * Display the list of Volume Location servers we're using for a cell.
254 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
256 struct sockaddr_rxrpc *addr = v;
258 /* display header on line 1 */
259 if (v == (void *)1) {
260 seq_puts(m, "ADDRESS\n");
264 /* display one cell per line on subsequent lines */
265 seq_printf(m, "%pISp\n", &addr->transport);
269 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
272 struct afs_addr_list *alist;
273 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
278 alist = rcu_dereference(cell->vl_addrs);
280 /* allow for the header line */
285 if (!alist || pos >= alist->nr_addrs)
288 return alist->addrs + pos;
291 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
294 struct afs_addr_list *alist;
295 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
298 alist = rcu_dereference(cell->vl_addrs);
302 if (!alist || pos >= alist->nr_addrs)
305 return alist->addrs + pos;
308 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
314 static const struct seq_operations afs_proc_cell_vlservers_ops = {
315 .start = afs_proc_cell_vlservers_start,
316 .next = afs_proc_cell_vlservers_next,
317 .stop = afs_proc_cell_vlservers_stop,
318 .show = afs_proc_cell_vlservers_show,
322 * Display the list of fileservers we're using within a namespace.
324 static int afs_proc_servers_show(struct seq_file *m, void *v)
326 struct afs_server *server;
327 struct afs_addr_list *alist;
330 if (v == SEQ_START_TOKEN) {
331 seq_puts(m, "UUID USE ADDR\n");
335 server = list_entry(v, struct afs_server, proc_link);
336 alist = rcu_dereference(server->addresses);
337 seq_printf(m, "%pU %3d %pISpc%s\n",
339 atomic_read(&server->usage),
340 &alist->addrs[0].transport,
341 alist->index == 0 ? "*" : "");
342 for (i = 1; i < alist->nr_addrs; i++)
343 seq_printf(m, " %pISpc%s\n",
344 &alist->addrs[i].transport,
345 alist->index == i ? "*" : "");
349 static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
353 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
356 static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
358 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
361 static void afs_proc_servers_stop(struct seq_file *m, void *v)
367 static const struct seq_operations afs_proc_servers_ops = {
368 .start = afs_proc_servers_start,
369 .next = afs_proc_servers_next,
370 .stop = afs_proc_servers_stop,
371 .show = afs_proc_servers_show,
375 * Display the list of strings that may be substituted for the @sys pathname
378 static int afs_proc_sysname_show(struct seq_file *m, void *v)
380 struct afs_net *net = afs_seq2net(m);
381 struct afs_sysnames *sysnames = net->sysnames;
382 unsigned int i = (unsigned long)v - 1;
384 if (i < sysnames->nr)
385 seq_printf(m, "%s\n", sysnames->subs[i]);
389 static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
390 __acquires(&net->sysnames_lock)
392 struct afs_net *net = afs_seq2net(m);
393 struct afs_sysnames *names;
395 read_lock(&net->sysnames_lock);
397 names = net->sysnames;
398 if (*pos >= names->nr)
400 return (void *)(unsigned long)(*pos + 1);
403 static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
405 struct afs_net *net = afs_seq2net(m);
406 struct afs_sysnames *names = net->sysnames;
409 if (*pos >= names->nr)
411 return (void *)(unsigned long)(*pos + 1);
414 static void afs_proc_sysname_stop(struct seq_file *m, void *v)
415 __releases(&net->sysnames_lock)
417 struct afs_net *net = afs_seq2net(m);
419 read_unlock(&net->sysnames_lock);
422 static const struct seq_operations afs_proc_sysname_ops = {
423 .start = afs_proc_sysname_start,
424 .next = afs_proc_sysname_next,
425 .stop = afs_proc_sysname_stop,
426 .show = afs_proc_sysname_show,
430 * Allow the @sys substitution to be configured.
432 static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
434 struct afs_sysnames *sysnames, *kill;
435 struct seq_file *m = file->private_data;
436 struct afs_net *net = afs_seq2net(m);
440 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
443 refcount_set(&sysnames->usage, 1);
447 while ((s = strsep(&p, " \t\n"))) {
452 if (len >= AFSNAMEMAX)
460 /* Protect against recursion */
464 (len < 2 || (len == 2 && s[1] == '.')))
467 if (memchr(s, '/', len))
471 if (sysnames->nr >= AFS_NR_SYSNAME)
474 if (strcmp(s, afs_init_sysname) == 0) {
475 sub = (char *)afs_init_sysname;
478 sub = kmemdup(s, len + 1, GFP_KERNEL);
483 sysnames->subs[sysnames->nr] = sub;
487 if (sysnames->nr == 0) {
488 sysnames->subs[0] = sysnames->blank;
492 write_lock(&net->sysnames_lock);
493 kill = net->sysnames;
494 net->sysnames = sysnames;
495 write_unlock(&net->sysnames_lock);
498 afs_put_sysnames(kill);
507 void afs_put_sysnames(struct afs_sysnames *sysnames)
511 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
512 for (i = 0; i < sysnames->nr; i++)
513 if (sysnames->subs[i] != afs_init_sysname &&
514 sysnames->subs[i] != sysnames->blank)
515 kfree(sysnames->subs[i]);
520 * Display general per-net namespace statistics
522 static int afs_proc_stats_show(struct seq_file *m, void *v)
524 struct afs_net *net = afs_seq2net_single(m);
526 seq_puts(m, "kAFS statistics\n");
528 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
529 atomic_read(&net->n_lookup),
530 atomic_read(&net->n_reval),
531 atomic_read(&net->n_inval),
532 atomic_read(&net->n_relpg));
534 seq_printf(m, "dir-data: rdpg=%u\n",
535 atomic_read(&net->n_read_dir));
537 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
538 atomic_read(&net->n_dir_cr),
539 atomic_read(&net->n_dir_rm));
541 seq_printf(m, "file-rd : n=%u nb=%lu\n",
542 atomic_read(&net->n_fetches),
543 atomic_long_read(&net->n_fetch_bytes));
544 seq_printf(m, "file-wr : n=%u nb=%lu\n",
545 atomic_read(&net->n_stores),
546 atomic_long_read(&net->n_store_bytes));
551 * initialise /proc/fs/afs/<cell>/
553 int afs_proc_cell_setup(struct afs_cell *cell)
555 struct proc_dir_entry *dir;
556 struct afs_net *net = cell->net;
558 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
560 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
564 if (!proc_create_net_data("vlservers", 0444, dir,
565 &afs_proc_cell_vlservers_ops,
566 sizeof(struct seq_net_private),
568 !proc_create_net_data("volumes", 0444, dir,
569 &afs_proc_cell_volumes_ops,
570 sizeof(struct seq_net_private),
578 remove_proc_subtree(cell->name, net->proc_afs);
580 _leave(" = -ENOMEM");
585 * remove /proc/fs/afs/<cell>/
587 void afs_proc_cell_remove(struct afs_cell *cell)
589 struct afs_net *net = cell->net;
592 remove_proc_subtree(cell->name, net->proc_afs);
597 * initialise the /proc/fs/afs/ directory
599 int afs_proc_init(struct afs_net *net)
601 struct proc_dir_entry *p;
605 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
609 if (!proc_create_net_data_write("cells", 0644, p,
611 afs_proc_cells_write,
612 sizeof(struct seq_net_private),
614 !proc_create_net_single_write("rootcell", 0644, p,
615 afs_proc_rootcell_show,
616 afs_proc_rootcell_write,
618 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
619 sizeof(struct seq_net_private)) ||
620 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
621 !proc_create_net_data_write("sysname", 0644, p,
622 &afs_proc_sysname_ops,
623 afs_proc_sysname_write,
624 sizeof(struct seq_net_private),
635 _leave(" = -ENOMEM");
640 * clean up the /proc/fs/afs/ directory
642 void afs_proc_cleanup(struct afs_net *net)
644 proc_remove(net->proc_afs);
645 net->proc_afs = NULL;