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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* /proc interface for AFS
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include <linux/sched.h>
13#include <linux/uaccess.h>
14#include "internal.h"
15
16struct afs_vl_seq_net_private {
17 struct seq_net_private seq; /* Must be first */
18 struct afs_vlserver_list *vllist;
19};
20
21static inline struct afs_net *afs_seq2net(struct seq_file *m)
22{
23 return afs_net(seq_file_net(m));
24}
25
26static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
27{
28 return afs_net(seq_file_single_net(m));
29}
30
31/*
32 * Display the list of cells known to the namespace.
33 */
34static int afs_proc_cells_show(struct seq_file *m, void *v)
35{
36 struct afs_vlserver_list *vllist;
37 struct afs_cell *cell;
38
39 if (v == SEQ_START_TOKEN) {
40 /* display header on line 1 */
41 seq_puts(m, "USE ACT TTL SV ST NAME\n");
42 return 0;
43 }
44
45 cell = list_entry(v, struct afs_cell, proc_link);
46 vllist = rcu_dereference(cell->vl_servers);
47
48 /* display one cell per line on subsequent lines */
49 seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
50 refcount_read(&cell->ref),
51 atomic_read(&cell->active),
52 cell->dns_expiry - ktime_get_real_seconds(),
53 vllist ? vllist->nr_servers : 0,
54 cell->state,
55 cell->name);
56 return 0;
57}
58
59static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
60 __acquires(rcu)
61{
62 rcu_read_lock();
63 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
64}
65
66static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
67{
68 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
69}
70
71static void afs_proc_cells_stop(struct seq_file *m, void *v)
72 __releases(rcu)
73{
74 rcu_read_unlock();
75}
76
77static const struct seq_operations afs_proc_cells_ops = {
78 .start = afs_proc_cells_start,
79 .next = afs_proc_cells_next,
80 .stop = afs_proc_cells_stop,
81 .show = afs_proc_cells_show,
82};
83
84/*
85 * handle writes to /proc/fs/afs/cells
86 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
87 */
88static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
89{
90 struct seq_file *m = file->private_data;
91 struct afs_net *net = afs_seq2net(m);
92 char *name, *args;
93 int ret;
94
95 /* trim to first NL */
96 name = memchr(buf, '\n', size);
97 if (name)
98 *name = 0;
99
100 /* split into command, name and argslist */
101 name = strchr(buf, ' ');
102 if (!name)
103 goto inval;
104 do {
105 *name++ = 0;
106 } while(*name == ' ');
107 if (!*name)
108 goto inval;
109
110 args = strchr(name, ' ');
111 if (args) {
112 do {
113 *args++ = 0;
114 } while(*args == ' ');
115 if (!*args)
116 goto inval;
117 }
118
119 /* determine command to perform */
120 _debug("cmd=%s name=%s args=%s", buf, name, args);
121
122 if (strcmp(buf, "add") == 0) {
123 struct afs_cell *cell;
124
125 cell = afs_lookup_cell(net, name, strlen(name), args, true);
126 if (IS_ERR(cell)) {
127 ret = PTR_ERR(cell);
128 goto done;
129 }
130
131 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
132 afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
133 } else {
134 goto inval;
135 }
136
137 ret = 0;
138
139done:
140 _leave(" = %d", ret);
141 return ret;
142
143inval:
144 ret = -EINVAL;
145 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
146 goto done;
147}
148
149/*
150 * Display the name of the current workstation cell.
151 */
152static int afs_proc_rootcell_show(struct seq_file *m, void *v)
153{
154 struct afs_cell *cell;
155 struct afs_net *net;
156
157 net = afs_seq2net_single(m);
158 down_read(&net->cells_lock);
159 cell = net->ws_cell;
160 if (cell)
161 seq_printf(m, "%s\n", cell->name);
162 up_read(&net->cells_lock);
163 return 0;
164}
165
166/*
167 * Set the current workstation cell and optionally supply its list of volume
168 * location servers.
169 *
170 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
171 */
172static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
173{
174 struct seq_file *m = file->private_data;
175 struct afs_net *net = afs_seq2net_single(m);
176 char *s;
177 int ret;
178
179 ret = -EINVAL;
180 if (buf[0] == '.')
181 goto out;
182 if (memchr(buf, '/', size))
183 goto out;
184
185 /* trim to first NL */
186 s = memchr(buf, '\n', size);
187 if (s)
188 *s = 0;
189
190 /* determine command to perform */
191 _debug("rootcell=%s", buf);
192
193 ret = afs_cell_init(net, buf);
194
195out:
196 _leave(" = %d", ret);
197 return ret;
198}
199
200static const char afs_vol_types[3][3] = {
201 [AFSVL_RWVOL] = "RW",
202 [AFSVL_ROVOL] = "RO",
203 [AFSVL_BACKVOL] = "BK",
204};
205
206/*
207 * Display the list of volumes known to a cell.
208 */
209static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
210{
211 struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
212
213 /* Display header on line 1 */
214 if (v == SEQ_START_TOKEN) {
215 seq_puts(m, "USE VID TY NAME\n");
216 return 0;
217 }
218
219 seq_printf(m, "%3d %08llx %s %s\n",
220 refcount_read(&vol->ref), vol->vid,
221 afs_vol_types[vol->type],
222 vol->name);
223
224 return 0;
225}
226
227static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
228 __acquires(cell->proc_lock)
229{
230 struct afs_cell *cell = pde_data(file_inode(m->file));
231
232 rcu_read_lock();
233 return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
234}
235
236static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
237 loff_t *_pos)
238{
239 struct afs_cell *cell = pde_data(file_inode(m->file));
240
241 return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
242}
243
244static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
245 __releases(cell->proc_lock)
246{
247 rcu_read_unlock();
248}
249
250static const struct seq_operations afs_proc_cell_volumes_ops = {
251 .start = afs_proc_cell_volumes_start,
252 .next = afs_proc_cell_volumes_next,
253 .stop = afs_proc_cell_volumes_stop,
254 .show = afs_proc_cell_volumes_show,
255};
256
257static const char *const dns_record_sources[NR__dns_record_source + 1] = {
258 [DNS_RECORD_UNAVAILABLE] = "unav",
259 [DNS_RECORD_FROM_CONFIG] = "cfg",
260 [DNS_RECORD_FROM_DNS_A] = "A",
261 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
262 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
263 [DNS_RECORD_FROM_NSS] = "nss",
264 [NR__dns_record_source] = "[weird]"
265};
266
267static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
268 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
269 [DNS_LOOKUP_GOOD] = "good",
270 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
271 [DNS_LOOKUP_BAD] = "bad",
272 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
273 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
274 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
275 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
276 [NR__dns_lookup_status] = "[weird]"
277};
278
279/*
280 * Display the list of Volume Location servers we're using for a cell.
281 */
282static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
283{
284 const struct afs_vl_seq_net_private *priv = m->private;
285 const struct afs_vlserver_list *vllist = priv->vllist;
286 const struct afs_vlserver_entry *entry;
287 const struct afs_vlserver *vlserver;
288 const struct afs_addr_list *alist;
289 int i;
290
291 if (v == SEQ_START_TOKEN) {
292 seq_printf(m, "# source %s, status %s\n",
293 dns_record_sources[vllist ? vllist->source : 0],
294 dns_lookup_statuses[vllist ? vllist->status : 0]);
295 return 0;
296 }
297
298 entry = v;
299 vlserver = entry->server;
300 alist = rcu_dereference(vlserver->addresses);
301
302 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
303 vlserver->name, entry->priority, entry->weight,
304 dns_record_sources[alist ? alist->source : entry->source],
305 dns_lookup_statuses[alist ? alist->status : entry->status]);
306 if (alist) {
307 for (i = 0; i < alist->nr_addrs; i++)
308 seq_printf(m, " %c %pISpc\n",
309 alist->preferred == i ? '>' : '-',
310 &alist->addrs[i].transport);
311 }
312 seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
313 seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
314 vlserver->probe.flags, vlserver->probe.error,
315 vlserver->probe.abort_code,
316 atomic_read(&vlserver->probe_outstanding));
317 return 0;
318}
319
320static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
321 __acquires(rcu)
322{
323 struct afs_vl_seq_net_private *priv = m->private;
324 struct afs_vlserver_list *vllist;
325 struct afs_cell *cell = pde_data(file_inode(m->file));
326 loff_t pos = *_pos;
327
328 rcu_read_lock();
329
330 vllist = rcu_dereference(cell->vl_servers);
331 priv->vllist = vllist;
332
333 if (pos < 0)
334 *_pos = pos = 0;
335 if (pos == 0)
336 return SEQ_START_TOKEN;
337
338 if (pos - 1 >= vllist->nr_servers)
339 return NULL;
340
341 return &vllist->servers[pos - 1];
342}
343
344static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
345 loff_t *_pos)
346{
347 struct afs_vl_seq_net_private *priv = m->private;
348 struct afs_vlserver_list *vllist = priv->vllist;
349 loff_t pos;
350
351 pos = *_pos;
352 pos++;
353 *_pos = pos;
354 if (!vllist || pos - 1 >= vllist->nr_servers)
355 return NULL;
356
357 return &vllist->servers[pos - 1];
358}
359
360static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
361 __releases(rcu)
362{
363 rcu_read_unlock();
364}
365
366static const struct seq_operations afs_proc_cell_vlservers_ops = {
367 .start = afs_proc_cell_vlservers_start,
368 .next = afs_proc_cell_vlservers_next,
369 .stop = afs_proc_cell_vlservers_stop,
370 .show = afs_proc_cell_vlservers_show,
371};
372
373/*
374 * Display the list of fileservers we're using within a namespace.
375 */
376static int afs_proc_servers_show(struct seq_file *m, void *v)
377{
378 struct afs_server *server;
379 struct afs_addr_list *alist;
380 int i;
381
382 if (v == SEQ_START_TOKEN) {
383 seq_puts(m, "UUID REF ACT\n");
384 return 0;
385 }
386
387 server = list_entry(v, struct afs_server, proc_link);
388 alist = rcu_dereference(server->addresses);
389 seq_printf(m, "%pU %3d %3d\n",
390 &server->uuid,
391 refcount_read(&server->ref),
392 atomic_read(&server->active));
393 seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n",
394 server->flags, server->rtt, server->cb_s_break);
395 seq_printf(m, " - probe: last=%d out=%d\n",
396 (int)(jiffies - server->probed_at) / HZ,
397 atomic_read(&server->probe_outstanding));
398 seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n",
399 alist->version, alist->responded, alist->failed);
400 for (i = 0; i < alist->nr_addrs; i++)
401 seq_printf(m, " [%x] %pISpc%s\n",
402 i, &alist->addrs[i].transport,
403 alist->preferred == i ? "*" : "");
404 return 0;
405}
406
407static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
408 __acquires(rcu)
409{
410 rcu_read_lock();
411 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
412}
413
414static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
415{
416 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
417}
418
419static void afs_proc_servers_stop(struct seq_file *m, void *v)
420 __releases(rcu)
421{
422 rcu_read_unlock();
423}
424
425static const struct seq_operations afs_proc_servers_ops = {
426 .start = afs_proc_servers_start,
427 .next = afs_proc_servers_next,
428 .stop = afs_proc_servers_stop,
429 .show = afs_proc_servers_show,
430};
431
432/*
433 * Display the list of strings that may be substituted for the @sys pathname
434 * macro.
435 */
436static int afs_proc_sysname_show(struct seq_file *m, void *v)
437{
438 struct afs_net *net = afs_seq2net(m);
439 struct afs_sysnames *sysnames = net->sysnames;
440 unsigned int i = (unsigned long)v - 1;
441
442 if (i < sysnames->nr)
443 seq_printf(m, "%s\n", sysnames->subs[i]);
444 return 0;
445}
446
447static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
448 __acquires(&net->sysnames_lock)
449{
450 struct afs_net *net = afs_seq2net(m);
451 struct afs_sysnames *names;
452
453 read_lock(&net->sysnames_lock);
454
455 names = net->sysnames;
456 if (*pos >= names->nr)
457 return NULL;
458 return (void *)(unsigned long)(*pos + 1);
459}
460
461static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
462{
463 struct afs_net *net = afs_seq2net(m);
464 struct afs_sysnames *names = net->sysnames;
465
466 *pos += 1;
467 if (*pos >= names->nr)
468 return NULL;
469 return (void *)(unsigned long)(*pos + 1);
470}
471
472static void afs_proc_sysname_stop(struct seq_file *m, void *v)
473 __releases(&net->sysnames_lock)
474{
475 struct afs_net *net = afs_seq2net(m);
476
477 read_unlock(&net->sysnames_lock);
478}
479
480static const struct seq_operations afs_proc_sysname_ops = {
481 .start = afs_proc_sysname_start,
482 .next = afs_proc_sysname_next,
483 .stop = afs_proc_sysname_stop,
484 .show = afs_proc_sysname_show,
485};
486
487/*
488 * Allow the @sys substitution to be configured.
489 */
490static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
491{
492 struct afs_sysnames *sysnames, *kill;
493 struct seq_file *m = file->private_data;
494 struct afs_net *net = afs_seq2net(m);
495 char *s, *p, *sub;
496 int ret, len;
497
498 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
499 if (!sysnames)
500 return -ENOMEM;
501 refcount_set(&sysnames->usage, 1);
502 kill = sysnames;
503
504 p = buf;
505 while ((s = strsep(&p, " \t\n"))) {
506 len = strlen(s);
507 if (len == 0)
508 continue;
509 ret = -ENAMETOOLONG;
510 if (len >= AFSNAMEMAX)
511 goto error;
512
513 if (len >= 4 &&
514 s[len - 4] == '@' &&
515 s[len - 3] == 's' &&
516 s[len - 2] == 'y' &&
517 s[len - 1] == 's')
518 /* Protect against recursion */
519 goto invalid;
520
521 if (s[0] == '.' &&
522 (len < 2 || (len == 2 && s[1] == '.')))
523 goto invalid;
524
525 if (memchr(s, '/', len))
526 goto invalid;
527
528 ret = -EFBIG;
529 if (sysnames->nr >= AFS_NR_SYSNAME)
530 goto out;
531
532 if (strcmp(s, afs_init_sysname) == 0) {
533 sub = (char *)afs_init_sysname;
534 } else {
535 ret = -ENOMEM;
536 sub = kmemdup(s, len + 1, GFP_KERNEL);
537 if (!sub)
538 goto out;
539 }
540
541 sysnames->subs[sysnames->nr] = sub;
542 sysnames->nr++;
543 }
544
545 if (sysnames->nr == 0) {
546 sysnames->subs[0] = sysnames->blank;
547 sysnames->nr++;
548 }
549
550 write_lock(&net->sysnames_lock);
551 kill = net->sysnames;
552 net->sysnames = sysnames;
553 write_unlock(&net->sysnames_lock);
554 ret = 0;
555out:
556 afs_put_sysnames(kill);
557 return ret;
558
559invalid:
560 ret = -EINVAL;
561error:
562 goto out;
563}
564
565void afs_put_sysnames(struct afs_sysnames *sysnames)
566{
567 int i;
568
569 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
570 for (i = 0; i < sysnames->nr; i++)
571 if (sysnames->subs[i] != afs_init_sysname &&
572 sysnames->subs[i] != sysnames->blank)
573 kfree(sysnames->subs[i]);
574 kfree(sysnames);
575 }
576}
577
578/*
579 * Display general per-net namespace statistics
580 */
581static int afs_proc_stats_show(struct seq_file *m, void *v)
582{
583 struct afs_net *net = afs_seq2net_single(m);
584
585 seq_puts(m, "kAFS statistics\n");
586
587 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
588 atomic_read(&net->n_lookup),
589 atomic_read(&net->n_reval),
590 atomic_read(&net->n_inval),
591 atomic_read(&net->n_relpg));
592
593 seq_printf(m, "dir-data: rdpg=%u\n",
594 atomic_read(&net->n_read_dir));
595
596 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
597 atomic_read(&net->n_dir_cr),
598 atomic_read(&net->n_dir_rm));
599
600 seq_printf(m, "file-rd : n=%u nb=%lu\n",
601 atomic_read(&net->n_fetches),
602 atomic_long_read(&net->n_fetch_bytes));
603 seq_printf(m, "file-wr : n=%u nb=%lu\n",
604 atomic_read(&net->n_stores),
605 atomic_long_read(&net->n_store_bytes));
606 return 0;
607}
608
609/*
610 * initialise /proc/fs/afs/<cell>/
611 */
612int afs_proc_cell_setup(struct afs_cell *cell)
613{
614 struct proc_dir_entry *dir;
615 struct afs_net *net = cell->net;
616
617 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
618
619 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
620 if (!dir)
621 goto error_dir;
622
623 if (!proc_create_net_data("vlservers", 0444, dir,
624 &afs_proc_cell_vlservers_ops,
625 sizeof(struct afs_vl_seq_net_private),
626 cell) ||
627 !proc_create_net_data("volumes", 0444, dir,
628 &afs_proc_cell_volumes_ops,
629 sizeof(struct seq_net_private),
630 cell))
631 goto error_tree;
632
633 _leave(" = 0");
634 return 0;
635
636error_tree:
637 remove_proc_subtree(cell->name, net->proc_afs);
638error_dir:
639 _leave(" = -ENOMEM");
640 return -ENOMEM;
641}
642
643/*
644 * remove /proc/fs/afs/<cell>/
645 */
646void afs_proc_cell_remove(struct afs_cell *cell)
647{
648 struct afs_net *net = cell->net;
649
650 _enter("");
651 remove_proc_subtree(cell->name, net->proc_afs);
652 _leave("");
653}
654
655/*
656 * initialise the /proc/fs/afs/ directory
657 */
658int afs_proc_init(struct afs_net *net)
659{
660 struct proc_dir_entry *p;
661
662 _enter("");
663
664 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
665 if (!p)
666 goto error_dir;
667
668 if (!proc_create_net_data_write("cells", 0644, p,
669 &afs_proc_cells_ops,
670 afs_proc_cells_write,
671 sizeof(struct seq_net_private),
672 NULL) ||
673 !proc_create_net_single_write("rootcell", 0644, p,
674 afs_proc_rootcell_show,
675 afs_proc_rootcell_write,
676 NULL) ||
677 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
678 sizeof(struct seq_net_private)) ||
679 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
680 !proc_create_net_data_write("sysname", 0644, p,
681 &afs_proc_sysname_ops,
682 afs_proc_sysname_write,
683 sizeof(struct seq_net_private),
684 NULL))
685 goto error_tree;
686
687 net->proc_afs = p;
688 _leave(" = 0");
689 return 0;
690
691error_tree:
692 proc_remove(p);
693error_dir:
694 _leave(" = -ENOMEM");
695 return -ENOMEM;
696}
697
698/*
699 * clean up the /proc/fs/afs/ directory
700 */
701void afs_proc_cleanup(struct afs_net *net)
702{
703 proc_remove(net->proc_afs);
704 net->proc_afs = NULL;
705}
1/* /proc interface for AFS
2 *
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
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.
10 */
11
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>
18#include "internal.h"
19
20static inline struct afs_net *afs_proc2net(struct file *f)
21{
22 return &__afs_net;
23}
24
25static inline struct afs_net *afs_seq2net(struct seq_file *m)
26{
27 return &__afs_net; // TODO: use seq_file_net(m)
28}
29
30static int afs_proc_cells_open(struct inode *inode, struct file *file);
31static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
32static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
33static void afs_proc_cells_stop(struct seq_file *p, void *v);
34static int afs_proc_cells_show(struct seq_file *m, void *v);
35static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
36 size_t size, loff_t *_pos);
37
38static const struct seq_operations afs_proc_cells_ops = {
39 .start = afs_proc_cells_start,
40 .next = afs_proc_cells_next,
41 .stop = afs_proc_cells_stop,
42 .show = afs_proc_cells_show,
43};
44
45static const struct file_operations afs_proc_cells_fops = {
46 .open = afs_proc_cells_open,
47 .read = seq_read,
48 .write = afs_proc_cells_write,
49 .llseek = seq_lseek,
50 .release = seq_release,
51};
52
53static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
54 size_t size, loff_t *_pos);
55static ssize_t afs_proc_rootcell_write(struct file *file,
56 const char __user *buf,
57 size_t size, loff_t *_pos);
58
59static const struct file_operations afs_proc_rootcell_fops = {
60 .read = afs_proc_rootcell_read,
61 .write = afs_proc_rootcell_write,
62 .llseek = no_llseek,
63};
64
65static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
66static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
67static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
68 loff_t *pos);
69static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
70static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
71
72static const struct seq_operations afs_proc_cell_volumes_ops = {
73 .start = afs_proc_cell_volumes_start,
74 .next = afs_proc_cell_volumes_next,
75 .stop = afs_proc_cell_volumes_stop,
76 .show = afs_proc_cell_volumes_show,
77};
78
79static const struct file_operations afs_proc_cell_volumes_fops = {
80 .open = afs_proc_cell_volumes_open,
81 .read = seq_read,
82 .llseek = seq_lseek,
83 .release = seq_release,
84};
85
86static int afs_proc_cell_vlservers_open(struct inode *inode,
87 struct file *file);
88static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
89static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
90 loff_t *pos);
91static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
92static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
93
94static const struct seq_operations afs_proc_cell_vlservers_ops = {
95 .start = afs_proc_cell_vlservers_start,
96 .next = afs_proc_cell_vlservers_next,
97 .stop = afs_proc_cell_vlservers_stop,
98 .show = afs_proc_cell_vlservers_show,
99};
100
101static const struct file_operations afs_proc_cell_vlservers_fops = {
102 .open = afs_proc_cell_vlservers_open,
103 .read = seq_read,
104 .llseek = seq_lseek,
105 .release = seq_release,
106};
107
108static int afs_proc_servers_open(struct inode *inode, struct file *file);
109static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos);
110static void *afs_proc_servers_next(struct seq_file *p, void *v,
111 loff_t *pos);
112static void afs_proc_servers_stop(struct seq_file *p, void *v);
113static int afs_proc_servers_show(struct seq_file *m, void *v);
114
115static const struct seq_operations afs_proc_servers_ops = {
116 .start = afs_proc_servers_start,
117 .next = afs_proc_servers_next,
118 .stop = afs_proc_servers_stop,
119 .show = afs_proc_servers_show,
120};
121
122static const struct file_operations afs_proc_servers_fops = {
123 .open = afs_proc_servers_open,
124 .read = seq_read,
125 .llseek = seq_lseek,
126 .release = seq_release,
127};
128
129static int afs_proc_sysname_open(struct inode *inode, struct file *file);
130static int afs_proc_sysname_release(struct inode *inode, struct file *file);
131static void *afs_proc_sysname_start(struct seq_file *p, loff_t *pos);
132static void *afs_proc_sysname_next(struct seq_file *p, void *v,
133 loff_t *pos);
134static void afs_proc_sysname_stop(struct seq_file *p, void *v);
135static int afs_proc_sysname_show(struct seq_file *m, void *v);
136static ssize_t afs_proc_sysname_write(struct file *file,
137 const char __user *buf,
138 size_t size, loff_t *_pos);
139
140static const struct seq_operations afs_proc_sysname_ops = {
141 .start = afs_proc_sysname_start,
142 .next = afs_proc_sysname_next,
143 .stop = afs_proc_sysname_stop,
144 .show = afs_proc_sysname_show,
145};
146
147static const struct file_operations afs_proc_sysname_fops = {
148 .open = afs_proc_sysname_open,
149 .read = seq_read,
150 .llseek = seq_lseek,
151 .release = afs_proc_sysname_release,
152 .write = afs_proc_sysname_write,
153};
154
155static const struct file_operations afs_proc_stats_fops;
156
157/*
158 * initialise the /proc/fs/afs/ directory
159 */
160int afs_proc_init(struct afs_net *net)
161{
162 _enter("");
163
164 net->proc_afs = proc_mkdir("fs/afs", NULL);
165 if (!net->proc_afs)
166 goto error_dir;
167
168 if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||
169 !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||
170 !proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops) ||
171 !proc_create("stats", 0644, net->proc_afs, &afs_proc_stats_fops) ||
172 !proc_create("sysname", 0644, net->proc_afs, &afs_proc_sysname_fops))
173 goto error_tree;
174
175 _leave(" = 0");
176 return 0;
177
178error_tree:
179 proc_remove(net->proc_afs);
180error_dir:
181 _leave(" = -ENOMEM");
182 return -ENOMEM;
183}
184
185/*
186 * clean up the /proc/fs/afs/ directory
187 */
188void afs_proc_cleanup(struct afs_net *net)
189{
190 proc_remove(net->proc_afs);
191 net->proc_afs = NULL;
192}
193
194/*
195 * open "/proc/fs/afs/cells" which provides a summary of extant cells
196 */
197static int afs_proc_cells_open(struct inode *inode, struct file *file)
198{
199 struct seq_file *m;
200 int ret;
201
202 ret = seq_open(file, &afs_proc_cells_ops);
203 if (ret < 0)
204 return ret;
205
206 m = file->private_data;
207 m->private = PDE_DATA(inode);
208 return 0;
209}
210
211/*
212 * set up the iterator to start reading from the cells list and return the
213 * first item
214 */
215static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
216 __acquires(rcu)
217{
218 struct afs_net *net = afs_seq2net(m);
219
220 rcu_read_lock();
221 return seq_list_start_head(&net->proc_cells, *_pos);
222}
223
224/*
225 * move to next cell in cells list
226 */
227static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
228{
229 struct afs_net *net = afs_seq2net(m);
230
231 return seq_list_next(v, &net->proc_cells, pos);
232}
233
234/*
235 * clean up after reading from the cells list
236 */
237static void afs_proc_cells_stop(struct seq_file *m, void *v)
238 __releases(rcu)
239{
240 rcu_read_unlock();
241}
242
243/*
244 * display a header line followed by a load of cell lines
245 */
246static int afs_proc_cells_show(struct seq_file *m, void *v)
247{
248 struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
249 struct afs_net *net = afs_seq2net(m);
250
251 if (v == &net->proc_cells) {
252 /* display header on line 1 */
253 seq_puts(m, "USE NAME\n");
254 return 0;
255 }
256
257 /* display one cell per line on subsequent lines */
258 seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
259 return 0;
260}
261
262/*
263 * handle writes to /proc/fs/afs/cells
264 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
265 */
266static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
267 size_t size, loff_t *_pos)
268{
269 struct afs_net *net = afs_proc2net(file);
270 char *kbuf, *name, *args;
271 int ret;
272
273 /* start by dragging the command into memory */
274 if (size <= 1 || size >= PAGE_SIZE)
275 return -EINVAL;
276
277 kbuf = memdup_user_nul(buf, size);
278 if (IS_ERR(kbuf))
279 return PTR_ERR(kbuf);
280
281 /* trim to first NL */
282 name = memchr(kbuf, '\n', size);
283 if (name)
284 *name = 0;
285
286 /* split into command, name and argslist */
287 name = strchr(kbuf, ' ');
288 if (!name)
289 goto inval;
290 do {
291 *name++ = 0;
292 } while(*name == ' ');
293 if (!*name)
294 goto inval;
295
296 args = strchr(name, ' ');
297 if (!args)
298 goto inval;
299 do {
300 *args++ = 0;
301 } while(*args == ' ');
302 if (!*args)
303 goto inval;
304
305 /* determine command to perform */
306 _debug("cmd=%s name=%s args=%s", kbuf, name, args);
307
308 if (strcmp(kbuf, "add") == 0) {
309 struct afs_cell *cell;
310
311 cell = afs_lookup_cell(net, name, strlen(name), args, true);
312 if (IS_ERR(cell)) {
313 ret = PTR_ERR(cell);
314 goto done;
315 }
316
317 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
318 afs_put_cell(net, cell);
319 printk("kAFS: Added new cell '%s'\n", name);
320 } else {
321 goto inval;
322 }
323
324 ret = size;
325
326done:
327 kfree(kbuf);
328 _leave(" = %d", ret);
329 return ret;
330
331inval:
332 ret = -EINVAL;
333 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
334 goto done;
335}
336
337static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
338 size_t size, loff_t *_pos)
339{
340 struct afs_cell *cell;
341 struct afs_net *net = afs_proc2net(file);
342 unsigned int seq = 0;
343 char name[AFS_MAXCELLNAME + 1];
344 int len;
345
346 if (*_pos > 0)
347 return 0;
348 if (!net->ws_cell)
349 return 0;
350
351 rcu_read_lock();
352 do {
353 read_seqbegin_or_lock(&net->cells_lock, &seq);
354 len = 0;
355 cell = rcu_dereference_raw(net->ws_cell);
356 if (cell) {
357 len = cell->name_len;
358 memcpy(name, cell->name, len);
359 }
360 } while (need_seqretry(&net->cells_lock, seq));
361 done_seqretry(&net->cells_lock, seq);
362 rcu_read_unlock();
363
364 if (!len)
365 return 0;
366
367 name[len++] = '\n';
368 if (len > size)
369 len = size;
370 if (copy_to_user(buf, name, len) != 0)
371 return -EFAULT;
372 *_pos = 1;
373 return len;
374}
375
376/*
377 * handle writes to /proc/fs/afs/rootcell
378 * - to initialize rootcell: echo "cell.name:192.168.231.14"
379 */
380static ssize_t afs_proc_rootcell_write(struct file *file,
381 const char __user *buf,
382 size_t size, loff_t *_pos)
383{
384 struct afs_net *net = afs_proc2net(file);
385 char *kbuf, *s;
386 int ret;
387
388 /* start by dragging the command into memory */
389 if (size <= 1 || size >= PAGE_SIZE)
390 return -EINVAL;
391
392 kbuf = memdup_user_nul(buf, size);
393 if (IS_ERR(kbuf))
394 return PTR_ERR(kbuf);
395
396 ret = -EINVAL;
397 if (kbuf[0] == '.')
398 goto out;
399 if (memchr(kbuf, '/', size))
400 goto out;
401
402 /* trim to first NL */
403 s = memchr(kbuf, '\n', size);
404 if (s)
405 *s = 0;
406
407 /* determine command to perform */
408 _debug("rootcell=%s", kbuf);
409
410 ret = afs_cell_init(net, kbuf);
411 if (ret >= 0)
412 ret = size; /* consume everything, always */
413
414out:
415 kfree(kbuf);
416 _leave(" = %d", ret);
417 return ret;
418}
419
420/*
421 * initialise /proc/fs/afs/<cell>/
422 */
423int afs_proc_cell_setup(struct afs_net *net, struct afs_cell *cell)
424{
425 struct proc_dir_entry *dir;
426
427 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
428
429 dir = proc_mkdir(cell->name, net->proc_afs);
430 if (!dir)
431 goto error_dir;
432
433 if (!proc_create_data("vlservers", 0, dir,
434 &afs_proc_cell_vlservers_fops, cell) ||
435 !proc_create_data("volumes", 0, dir,
436 &afs_proc_cell_volumes_fops, cell))
437 goto error_tree;
438
439 _leave(" = 0");
440 return 0;
441
442error_tree:
443 remove_proc_subtree(cell->name, net->proc_afs);
444error_dir:
445 _leave(" = -ENOMEM");
446 return -ENOMEM;
447}
448
449/*
450 * remove /proc/fs/afs/<cell>/
451 */
452void afs_proc_cell_remove(struct afs_net *net, struct afs_cell *cell)
453{
454 _enter("");
455
456 remove_proc_subtree(cell->name, net->proc_afs);
457
458 _leave("");
459}
460
461/*
462 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
463 */
464static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
465{
466 struct afs_cell *cell;
467 struct seq_file *m;
468 int ret;
469
470 cell = PDE_DATA(inode);
471 if (!cell)
472 return -ENOENT;
473
474 ret = seq_open(file, &afs_proc_cell_volumes_ops);
475 if (ret < 0)
476 return ret;
477
478 m = file->private_data;
479 m->private = cell;
480
481 return 0;
482}
483
484/*
485 * set up the iterator to start reading from the cells list and return the
486 * first item
487 */
488static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
489 __acquires(cell->proc_lock)
490{
491 struct afs_cell *cell = m->private;
492
493 _enter("cell=%p pos=%Ld", cell, *_pos);
494
495 read_lock(&cell->proc_lock);
496 return seq_list_start_head(&cell->proc_volumes, *_pos);
497}
498
499/*
500 * move to next cell in cells list
501 */
502static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
503 loff_t *_pos)
504{
505 struct afs_cell *cell = p->private;
506
507 _enter("cell=%p pos=%Ld", cell, *_pos);
508 return seq_list_next(v, &cell->proc_volumes, _pos);
509}
510
511/*
512 * clean up after reading from the cells list
513 */
514static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
515 __releases(cell->proc_lock)
516{
517 struct afs_cell *cell = p->private;
518
519 read_unlock(&cell->proc_lock);
520}
521
522static const char afs_vol_types[3][3] = {
523 [AFSVL_RWVOL] = "RW",
524 [AFSVL_ROVOL] = "RO",
525 [AFSVL_BACKVOL] = "BK",
526};
527
528/*
529 * display a header line followed by a load of volume lines
530 */
531static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
532{
533 struct afs_cell *cell = m->private;
534 struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
535
536 /* Display header on line 1 */
537 if (v == &cell->proc_volumes) {
538 seq_puts(m, "USE VID TY\n");
539 return 0;
540 }
541
542 seq_printf(m, "%3d %08x %s\n",
543 atomic_read(&vol->usage), vol->vid,
544 afs_vol_types[vol->type]);
545
546 return 0;
547}
548
549/*
550 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
551 * location server
552 */
553static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
554{
555 struct afs_cell *cell;
556 struct seq_file *m;
557 int ret;
558
559 cell = PDE_DATA(inode);
560 if (!cell)
561 return -ENOENT;
562
563 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
564 if (ret<0)
565 return ret;
566
567 m = file->private_data;
568 m->private = cell;
569
570 return 0;
571}
572
573/*
574 * set up the iterator to start reading from the cells list and return the
575 * first item
576 */
577static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
578 __acquires(rcu)
579{
580 struct afs_addr_list *alist;
581 struct afs_cell *cell = m->private;
582 loff_t pos = *_pos;
583
584 rcu_read_lock();
585
586 alist = rcu_dereference(cell->vl_addrs);
587
588 /* allow for the header line */
589 if (!pos)
590 return (void *) 1;
591 pos--;
592
593 if (!alist || pos >= alist->nr_addrs)
594 return NULL;
595
596 return alist->addrs + pos;
597}
598
599/*
600 * move to next cell in cells list
601 */
602static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
603 loff_t *_pos)
604{
605 struct afs_addr_list *alist;
606 struct afs_cell *cell = p->private;
607 loff_t pos;
608
609 alist = rcu_dereference(cell->vl_addrs);
610
611 pos = *_pos;
612 (*_pos)++;
613 if (!alist || pos >= alist->nr_addrs)
614 return NULL;
615
616 return alist->addrs + pos;
617}
618
619/*
620 * clean up after reading from the cells list
621 */
622static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
623 __releases(rcu)
624{
625 rcu_read_unlock();
626}
627
628/*
629 * display a header line followed by a load of volume lines
630 */
631static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
632{
633 struct sockaddr_rxrpc *addr = v;
634
635 /* display header on line 1 */
636 if (v == (void *)1) {
637 seq_puts(m, "ADDRESS\n");
638 return 0;
639 }
640
641 /* display one cell per line on subsequent lines */
642 seq_printf(m, "%pISp\n", &addr->transport);
643 return 0;
644}
645
646/*
647 * open "/proc/fs/afs/servers" which provides a summary of active
648 * servers
649 */
650static int afs_proc_servers_open(struct inode *inode, struct file *file)
651{
652 return seq_open(file, &afs_proc_servers_ops);
653}
654
655/*
656 * Set up the iterator to start reading from the server list and return the
657 * first item.
658 */
659static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
660 __acquires(rcu)
661{
662 struct afs_net *net = afs_seq2net(m);
663
664 rcu_read_lock();
665 return seq_hlist_start_head_rcu(&net->fs_proc, *_pos);
666}
667
668/*
669 * move to next cell in cells list
670 */
671static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
672{
673 struct afs_net *net = afs_seq2net(m);
674
675 return seq_hlist_next_rcu(v, &net->fs_proc, _pos);
676}
677
678/*
679 * clean up after reading from the cells list
680 */
681static void afs_proc_servers_stop(struct seq_file *p, void *v)
682 __releases(rcu)
683{
684 rcu_read_unlock();
685}
686
687/*
688 * display a header line followed by a load of volume lines
689 */
690static int afs_proc_servers_show(struct seq_file *m, void *v)
691{
692 struct afs_server *server;
693 struct afs_addr_list *alist;
694
695 if (v == SEQ_START_TOKEN) {
696 seq_puts(m, "UUID USE ADDR\n");
697 return 0;
698 }
699
700 server = list_entry(v, struct afs_server, proc_link);
701 alist = rcu_dereference(server->addresses);
702 seq_printf(m, "%pU %3d %pISp\n",
703 &server->uuid,
704 atomic_read(&server->usage),
705 &alist->addrs[alist->index].transport);
706 return 0;
707}
708
709void afs_put_sysnames(struct afs_sysnames *sysnames)
710{
711 int i;
712
713 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
714 for (i = 0; i < sysnames->nr; i++)
715 if (sysnames->subs[i] != afs_init_sysname &&
716 sysnames->subs[i] != sysnames->blank)
717 kfree(sysnames->subs[i]);
718 }
719}
720
721/*
722 * Handle opening of /proc/fs/afs/sysname. If it is opened for writing, we
723 * assume the caller wants to change the substitution list and we allocate a
724 * buffer to hold the list.
725 */
726static int afs_proc_sysname_open(struct inode *inode, struct file *file)
727{
728 struct afs_sysnames *sysnames;
729 struct seq_file *m;
730 int ret;
731
732 ret = seq_open(file, &afs_proc_sysname_ops);
733 if (ret < 0)
734 return ret;
735
736 if (file->f_mode & FMODE_WRITE) {
737 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
738 if (!sysnames) {
739 seq_release(inode, file);
740 return -ENOMEM;
741 }
742
743 refcount_set(&sysnames->usage, 1);
744 m = file->private_data;
745 m->private = sysnames;
746 }
747
748 return 0;
749}
750
751/*
752 * Handle writes to /proc/fs/afs/sysname to set the @sys substitution.
753 */
754static ssize_t afs_proc_sysname_write(struct file *file,
755 const char __user *buf,
756 size_t size, loff_t *_pos)
757{
758 struct afs_sysnames *sysnames;
759 struct seq_file *m = file->private_data;
760 char *kbuf = NULL, *s, *p, *sub;
761 int ret, len;
762
763 sysnames = m->private;
764 if (!sysnames)
765 return -EINVAL;
766 if (sysnames->error)
767 return sysnames->error;
768
769 if (size >= PAGE_SIZE - 1) {
770 sysnames->error = -EINVAL;
771 return -EINVAL;
772 }
773 if (size == 0)
774 return 0;
775
776 kbuf = memdup_user_nul(buf, size);
777 if (IS_ERR(kbuf))
778 return PTR_ERR(kbuf);
779
780 inode_lock(file_inode(file));
781
782 p = kbuf;
783 while ((s = strsep(&p, " \t\n"))) {
784 len = strlen(s);
785 if (len == 0)
786 continue;
787 ret = -ENAMETOOLONG;
788 if (len >= AFSNAMEMAX)
789 goto error;
790
791 if (len >= 4 &&
792 s[len - 4] == '@' &&
793 s[len - 3] == 's' &&
794 s[len - 2] == 'y' &&
795 s[len - 1] == 's')
796 /* Protect against recursion */
797 goto invalid;
798
799 if (s[0] == '.' &&
800 (len < 2 || (len == 2 && s[1] == '.')))
801 goto invalid;
802
803 if (memchr(s, '/', len))
804 goto invalid;
805
806 ret = -EFBIG;
807 if (sysnames->nr >= AFS_NR_SYSNAME)
808 goto out;
809
810 if (strcmp(s, afs_init_sysname) == 0) {
811 sub = (char *)afs_init_sysname;
812 } else {
813 ret = -ENOMEM;
814 sub = kmemdup(s, len + 1, GFP_KERNEL);
815 if (!sub)
816 goto out;
817 }
818
819 sysnames->subs[sysnames->nr] = sub;
820 sysnames->nr++;
821 }
822
823 ret = size; /* consume everything, always */
824out:
825 inode_unlock(file_inode(file));
826 kfree(kbuf);
827 return ret;
828
829invalid:
830 ret = -EINVAL;
831error:
832 sysnames->error = ret;
833 goto out;
834}
835
836static int afs_proc_sysname_release(struct inode *inode, struct file *file)
837{
838 struct afs_sysnames *sysnames, *kill = NULL;
839 struct seq_file *m = file->private_data;
840 struct afs_net *net = afs_seq2net(m);
841
842 sysnames = m->private;
843 if (sysnames) {
844 if (!sysnames->error) {
845 kill = sysnames;
846 if (sysnames->nr == 0) {
847 sysnames->subs[0] = sysnames->blank;
848 sysnames->nr++;
849 }
850 write_lock(&net->sysnames_lock);
851 kill = net->sysnames;
852 net->sysnames = sysnames;
853 write_unlock(&net->sysnames_lock);
854 }
855 afs_put_sysnames(kill);
856 }
857
858 return seq_release(inode, file);
859}
860
861static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
862 __acquires(&net->sysnames_lock)
863{
864 struct afs_net *net = afs_seq2net(m);
865 struct afs_sysnames *names = net->sysnames;
866
867 read_lock(&net->sysnames_lock);
868
869 if (*pos >= names->nr)
870 return NULL;
871 return (void *)(unsigned long)(*pos + 1);
872}
873
874static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
875{
876 struct afs_net *net = afs_seq2net(m);
877 struct afs_sysnames *names = net->sysnames;
878
879 *pos += 1;
880 if (*pos >= names->nr)
881 return NULL;
882 return (void *)(unsigned long)(*pos + 1);
883}
884
885static void afs_proc_sysname_stop(struct seq_file *m, void *v)
886 __releases(&net->sysnames_lock)
887{
888 struct afs_net *net = afs_seq2net(m);
889
890 read_unlock(&net->sysnames_lock);
891}
892
893static int afs_proc_sysname_show(struct seq_file *m, void *v)
894{
895 struct afs_net *net = afs_seq2net(m);
896 struct afs_sysnames *sysnames = net->sysnames;
897 unsigned int i = (unsigned long)v - 1;
898
899 if (i < sysnames->nr)
900 seq_printf(m, "%s\n", sysnames->subs[i]);
901 return 0;
902}
903
904/*
905 * Display general per-net namespace statistics
906 */
907static int afs_proc_stats_show(struct seq_file *m, void *v)
908{
909 struct afs_net *net = afs_seq2net(m);
910
911 seq_puts(m, "kAFS statistics\n");
912
913 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
914 atomic_read(&net->n_lookup),
915 atomic_read(&net->n_reval),
916 atomic_read(&net->n_inval),
917 atomic_read(&net->n_relpg));
918
919 seq_printf(m, "dir-data: rdpg=%u\n",
920 atomic_read(&net->n_read_dir));
921
922 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
923 atomic_read(&net->n_dir_cr),
924 atomic_read(&net->n_dir_rm));
925
926 seq_printf(m, "file-rd : n=%u nb=%lu\n",
927 atomic_read(&net->n_fetches),
928 atomic_long_read(&net->n_fetch_bytes));
929 seq_printf(m, "file-wr : n=%u nb=%lu\n",
930 atomic_read(&net->n_stores),
931 atomic_long_read(&net->n_store_bytes));
932 return 0;
933}
934
935/*
936 * Open "/proc/fs/afs/stats" to allow reading of the stat counters.
937 */
938static int afs_proc_stats_open(struct inode *inode, struct file *file)
939{
940 return single_open(file, afs_proc_stats_show, NULL);
941}
942
943static const struct file_operations afs_proc_stats_fops = {
944 .open = afs_proc_stats_open,
945 .read = seq_read,
946 .llseek = seq_lseek,
947 .release = single_release,
948};