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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 <asm/uaccess.h>
18#include "internal.h"
19
20static struct proc_dir_entry *proc_afs;
21
22
23static int afs_proc_cells_open(struct inode *inode, struct file *file);
24static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
25static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
26static void afs_proc_cells_stop(struct seq_file *p, void *v);
27static int afs_proc_cells_show(struct seq_file *m, void *v);
28static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
29 size_t size, loff_t *_pos);
30
31static const struct seq_operations afs_proc_cells_ops = {
32 .start = afs_proc_cells_start,
33 .next = afs_proc_cells_next,
34 .stop = afs_proc_cells_stop,
35 .show = afs_proc_cells_show,
36};
37
38static const struct file_operations afs_proc_cells_fops = {
39 .open = afs_proc_cells_open,
40 .read = seq_read,
41 .write = afs_proc_cells_write,
42 .llseek = seq_lseek,
43 .release = seq_release,
44 .owner = THIS_MODULE,
45};
46
47static int afs_proc_rootcell_open(struct inode *inode, struct file *file);
48static int afs_proc_rootcell_release(struct inode *inode, struct file *file);
49static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
50 size_t size, loff_t *_pos);
51static ssize_t afs_proc_rootcell_write(struct file *file,
52 const char __user *buf,
53 size_t size, loff_t *_pos);
54
55static const struct file_operations afs_proc_rootcell_fops = {
56 .open = afs_proc_rootcell_open,
57 .read = afs_proc_rootcell_read,
58 .write = afs_proc_rootcell_write,
59 .llseek = no_llseek,
60 .release = afs_proc_rootcell_release,
61 .owner = THIS_MODULE,
62};
63
64static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
65static int afs_proc_cell_volumes_release(struct inode *inode,
66 struct file *file);
67static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
68static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
69 loff_t *pos);
70static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
71static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
72
73static const struct seq_operations afs_proc_cell_volumes_ops = {
74 .start = afs_proc_cell_volumes_start,
75 .next = afs_proc_cell_volumes_next,
76 .stop = afs_proc_cell_volumes_stop,
77 .show = afs_proc_cell_volumes_show,
78};
79
80static const struct file_operations afs_proc_cell_volumes_fops = {
81 .open = afs_proc_cell_volumes_open,
82 .read = seq_read,
83 .llseek = seq_lseek,
84 .release = afs_proc_cell_volumes_release,
85 .owner = THIS_MODULE,
86};
87
88static int afs_proc_cell_vlservers_open(struct inode *inode,
89 struct file *file);
90static int afs_proc_cell_vlservers_release(struct inode *inode,
91 struct file *file);
92static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
93static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
94 loff_t *pos);
95static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
96static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
97
98static const struct seq_operations afs_proc_cell_vlservers_ops = {
99 .start = afs_proc_cell_vlservers_start,
100 .next = afs_proc_cell_vlservers_next,
101 .stop = afs_proc_cell_vlservers_stop,
102 .show = afs_proc_cell_vlservers_show,
103};
104
105static const struct file_operations afs_proc_cell_vlservers_fops = {
106 .open = afs_proc_cell_vlservers_open,
107 .read = seq_read,
108 .llseek = seq_lseek,
109 .release = afs_proc_cell_vlservers_release,
110 .owner = THIS_MODULE,
111};
112
113static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
114static int afs_proc_cell_servers_release(struct inode *inode,
115 struct file *file);
116static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
117static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
118 loff_t *pos);
119static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
120static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
121
122static const struct seq_operations afs_proc_cell_servers_ops = {
123 .start = afs_proc_cell_servers_start,
124 .next = afs_proc_cell_servers_next,
125 .stop = afs_proc_cell_servers_stop,
126 .show = afs_proc_cell_servers_show,
127};
128
129static const struct file_operations afs_proc_cell_servers_fops = {
130 .open = afs_proc_cell_servers_open,
131 .read = seq_read,
132 .llseek = seq_lseek,
133 .release = afs_proc_cell_servers_release,
134 .owner = THIS_MODULE,
135};
136
137/*
138 * initialise the /proc/fs/afs/ directory
139 */
140int afs_proc_init(void)
141{
142 struct proc_dir_entry *p;
143
144 _enter("");
145
146 proc_afs = proc_mkdir("fs/afs", NULL);
147 if (!proc_afs)
148 goto error_dir;
149
150 p = proc_create("cells", 0, proc_afs, &afs_proc_cells_fops);
151 if (!p)
152 goto error_cells;
153
154 p = proc_create("rootcell", 0, proc_afs, &afs_proc_rootcell_fops);
155 if (!p)
156 goto error_rootcell;
157
158 _leave(" = 0");
159 return 0;
160
161error_rootcell:
162 remove_proc_entry("cells", proc_afs);
163error_cells:
164 remove_proc_entry("fs/afs", NULL);
165error_dir:
166 _leave(" = -ENOMEM");
167 return -ENOMEM;
168}
169
170/*
171 * clean up the /proc/fs/afs/ directory
172 */
173void afs_proc_cleanup(void)
174{
175 remove_proc_entry("rootcell", proc_afs);
176 remove_proc_entry("cells", proc_afs);
177 remove_proc_entry("fs/afs", NULL);
178}
179
180/*
181 * open "/proc/fs/afs/cells" which provides a summary of extant cells
182 */
183static int afs_proc_cells_open(struct inode *inode, struct file *file)
184{
185 struct seq_file *m;
186 int ret;
187
188 ret = seq_open(file, &afs_proc_cells_ops);
189 if (ret < 0)
190 return ret;
191
192 m = file->private_data;
193 m->private = PDE(inode)->data;
194
195 return 0;
196}
197
198/*
199 * set up the iterator to start reading from the cells list and return the
200 * first item
201 */
202static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
203{
204 /* lock the list against modification */
205 down_read(&afs_proc_cells_sem);
206 return seq_list_start_head(&afs_proc_cells, *_pos);
207}
208
209/*
210 * move to next cell in cells list
211 */
212static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos)
213{
214 return seq_list_next(v, &afs_proc_cells, pos);
215}
216
217/*
218 * clean up after reading from the cells list
219 */
220static void afs_proc_cells_stop(struct seq_file *p, void *v)
221{
222 up_read(&afs_proc_cells_sem);
223}
224
225/*
226 * display a header line followed by a load of cell lines
227 */
228static int afs_proc_cells_show(struct seq_file *m, void *v)
229{
230 struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
231
232 if (v == &afs_proc_cells) {
233 /* display header on line 1 */
234 seq_puts(m, "USE NAME\n");
235 return 0;
236 }
237
238 /* display one cell per line on subsequent lines */
239 seq_printf(m, "%3d %s\n",
240 atomic_read(&cell->usage), cell->name);
241 return 0;
242}
243
244/*
245 * handle writes to /proc/fs/afs/cells
246 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
247 */
248static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
249 size_t size, loff_t *_pos)
250{
251 char *kbuf, *name, *args;
252 int ret;
253
254 /* start by dragging the command into memory */
255 if (size <= 1 || size >= PAGE_SIZE)
256 return -EINVAL;
257
258 kbuf = kmalloc(size + 1, GFP_KERNEL);
259 if (!kbuf)
260 return -ENOMEM;
261
262 ret = -EFAULT;
263 if (copy_from_user(kbuf, buf, size) != 0)
264 goto done;
265 kbuf[size] = 0;
266
267 /* trim to first NL */
268 name = memchr(kbuf, '\n', size);
269 if (name)
270 *name = 0;
271
272 /* split into command, name and argslist */
273 name = strchr(kbuf, ' ');
274 if (!name)
275 goto inval;
276 do {
277 *name++ = 0;
278 } while(*name == ' ');
279 if (!*name)
280 goto inval;
281
282 args = strchr(name, ' ');
283 if (!args)
284 goto inval;
285 do {
286 *args++ = 0;
287 } while(*args == ' ');
288 if (!*args)
289 goto inval;
290
291 /* determine command to perform */
292 _debug("cmd=%s name=%s args=%s", kbuf, name, args);
293
294 if (strcmp(kbuf, "add") == 0) {
295 struct afs_cell *cell;
296
297 cell = afs_cell_create(name, strlen(name), args, false);
298 if (IS_ERR(cell)) {
299 ret = PTR_ERR(cell);
300 goto done;
301 }
302
303 afs_put_cell(cell);
304 printk("kAFS: Added new cell '%s'\n", name);
305 } else {
306 goto inval;
307 }
308
309 ret = size;
310
311done:
312 kfree(kbuf);
313 _leave(" = %d", ret);
314 return ret;
315
316inval:
317 ret = -EINVAL;
318 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
319 goto done;
320}
321
322/*
323 * Stubs for /proc/fs/afs/rootcell
324 */
325static int afs_proc_rootcell_open(struct inode *inode, struct file *file)
326{
327 return 0;
328}
329
330static int afs_proc_rootcell_release(struct inode *inode, struct file *file)
331{
332 return 0;
333}
334
335static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
336 size_t size, loff_t *_pos)
337{
338 return 0;
339}
340
341/*
342 * handle writes to /proc/fs/afs/rootcell
343 * - to initialize rootcell: echo "cell.name:192.168.231.14"
344 */
345static ssize_t afs_proc_rootcell_write(struct file *file,
346 const char __user *buf,
347 size_t size, loff_t *_pos)
348{
349 char *kbuf, *s;
350 int ret;
351
352 /* start by dragging the command into memory */
353 if (size <= 1 || size >= PAGE_SIZE)
354 return -EINVAL;
355
356 ret = -ENOMEM;
357 kbuf = kmalloc(size + 1, GFP_KERNEL);
358 if (!kbuf)
359 goto nomem;
360
361 ret = -EFAULT;
362 if (copy_from_user(kbuf, buf, size) != 0)
363 goto infault;
364 kbuf[size] = 0;
365
366 /* trim to first NL */
367 s = memchr(kbuf, '\n', size);
368 if (s)
369 *s = 0;
370
371 /* determine command to perform */
372 _debug("rootcell=%s", kbuf);
373
374 ret = afs_cell_init(kbuf);
375 if (ret >= 0)
376 ret = size; /* consume everything, always */
377
378infault:
379 kfree(kbuf);
380nomem:
381 _leave(" = %d", ret);
382 return ret;
383}
384
385/*
386 * initialise /proc/fs/afs/<cell>/
387 */
388int afs_proc_cell_setup(struct afs_cell *cell)
389{
390 struct proc_dir_entry *p;
391
392 _enter("%p{%s}", cell, cell->name);
393
394 cell->proc_dir = proc_mkdir(cell->name, proc_afs);
395 if (!cell->proc_dir)
396 goto error_dir;
397
398 p = proc_create_data("servers", 0, cell->proc_dir,
399 &afs_proc_cell_servers_fops, cell);
400 if (!p)
401 goto error_servers;
402
403 p = proc_create_data("vlservers", 0, cell->proc_dir,
404 &afs_proc_cell_vlservers_fops, cell);
405 if (!p)
406 goto error_vlservers;
407
408 p = proc_create_data("volumes", 0, cell->proc_dir,
409 &afs_proc_cell_volumes_fops, cell);
410 if (!p)
411 goto error_volumes;
412
413 _leave(" = 0");
414 return 0;
415
416error_volumes:
417 remove_proc_entry("vlservers", cell->proc_dir);
418error_vlservers:
419 remove_proc_entry("servers", cell->proc_dir);
420error_servers:
421 remove_proc_entry(cell->name, proc_afs);
422error_dir:
423 _leave(" = -ENOMEM");
424 return -ENOMEM;
425}
426
427/*
428 * remove /proc/fs/afs/<cell>/
429 */
430void afs_proc_cell_remove(struct afs_cell *cell)
431{
432 _enter("");
433
434 remove_proc_entry("volumes", cell->proc_dir);
435 remove_proc_entry("vlservers", cell->proc_dir);
436 remove_proc_entry("servers", cell->proc_dir);
437 remove_proc_entry(cell->name, proc_afs);
438
439 _leave("");
440}
441
442/*
443 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
444 */
445static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
446{
447 struct afs_cell *cell;
448 struct seq_file *m;
449 int ret;
450
451 cell = PDE(inode)->data;
452 if (!cell)
453 return -ENOENT;
454
455 ret = seq_open(file, &afs_proc_cell_volumes_ops);
456 if (ret < 0)
457 return ret;
458
459 m = file->private_data;
460 m->private = cell;
461
462 return 0;
463}
464
465/*
466 * close the file and release the ref to the cell
467 */
468static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file)
469{
470 return seq_release(inode, file);
471}
472
473/*
474 * set up the iterator to start reading from the cells list and return the
475 * first item
476 */
477static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
478{
479 struct afs_cell *cell = m->private;
480
481 _enter("cell=%p pos=%Ld", cell, *_pos);
482
483 /* lock the list against modification */
484 down_read(&cell->vl_sem);
485 return seq_list_start_head(&cell->vl_list, *_pos);
486}
487
488/*
489 * move to next cell in cells list
490 */
491static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
492 loff_t *_pos)
493{
494 struct afs_cell *cell = p->private;
495
496 _enter("cell=%p pos=%Ld", cell, *_pos);
497 return seq_list_next(v, &cell->vl_list, _pos);
498}
499
500/*
501 * clean up after reading from the cells list
502 */
503static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
504{
505 struct afs_cell *cell = p->private;
506
507 up_read(&cell->vl_sem);
508}
509
510static const char afs_vlocation_states[][4] = {
511 [AFS_VL_NEW] = "New",
512 [AFS_VL_CREATING] = "Crt",
513 [AFS_VL_VALID] = "Val",
514 [AFS_VL_NO_VOLUME] = "NoV",
515 [AFS_VL_UPDATING] = "Upd",
516 [AFS_VL_VOLUME_DELETED] = "Del",
517 [AFS_VL_UNCERTAIN] = "Unc",
518};
519
520/*
521 * display a header line followed by a load of volume lines
522 */
523static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
524{
525 struct afs_cell *cell = m->private;
526 struct afs_vlocation *vlocation =
527 list_entry(v, struct afs_vlocation, link);
528
529 /* display header on line 1 */
530 if (v == &cell->vl_list) {
531 seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
532 return 0;
533 }
534
535 /* display one cell per line on subsequent lines */
536 seq_printf(m, "%3d %s %08x %08x %08x %s\n",
537 atomic_read(&vlocation->usage),
538 afs_vlocation_states[vlocation->state],
539 vlocation->vldb.vid[0],
540 vlocation->vldb.vid[1],
541 vlocation->vldb.vid[2],
542 vlocation->vldb.name);
543
544 return 0;
545}
546
547/*
548 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
549 * location server
550 */
551static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
552{
553 struct afs_cell *cell;
554 struct seq_file *m;
555 int ret;
556
557 cell = PDE(inode)->data;
558 if (!cell)
559 return -ENOENT;
560
561 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
562 if (ret<0)
563 return ret;
564
565 m = file->private_data;
566 m->private = cell;
567
568 return 0;
569}
570
571/*
572 * close the file and release the ref to the cell
573 */
574static int afs_proc_cell_vlservers_release(struct inode *inode,
575 struct file *file)
576{
577 return seq_release(inode, file);
578}
579
580/*
581 * set up the iterator to start reading from the cells list and return the
582 * first item
583 */
584static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
585{
586 struct afs_cell *cell = m->private;
587 loff_t pos = *_pos;
588
589 _enter("cell=%p pos=%Ld", cell, *_pos);
590
591 /* lock the list against modification */
592 down_read(&cell->vl_sem);
593
594 /* allow for the header line */
595 if (!pos)
596 return (void *) 1;
597 pos--;
598
599 if (pos >= cell->vl_naddrs)
600 return NULL;
601
602 return &cell->vl_addrs[pos];
603}
604
605/*
606 * move to next cell in cells list
607 */
608static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
609 loff_t *_pos)
610{
611 struct afs_cell *cell = p->private;
612 loff_t pos;
613
614 _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
615
616 pos = *_pos;
617 (*_pos)++;
618 if (pos >= cell->vl_naddrs)
619 return NULL;
620
621 return &cell->vl_addrs[pos];
622}
623
624/*
625 * clean up after reading from the cells list
626 */
627static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
628{
629 struct afs_cell *cell = p->private;
630
631 up_read(&cell->vl_sem);
632}
633
634/*
635 * display a header line followed by a load of volume lines
636 */
637static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
638{
639 struct in_addr *addr = v;
640
641 /* display header on line 1 */
642 if (v == (struct in_addr *) 1) {
643 seq_puts(m, "ADDRESS\n");
644 return 0;
645 }
646
647 /* display one cell per line on subsequent lines */
648 seq_printf(m, "%pI4\n", &addr->s_addr);
649 return 0;
650}
651
652/*
653 * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
654 * servers
655 */
656static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
657{
658 struct afs_cell *cell;
659 struct seq_file *m;
660 int ret;
661
662 cell = PDE(inode)->data;
663 if (!cell)
664 return -ENOENT;
665
666 ret = seq_open(file, &afs_proc_cell_servers_ops);
667 if (ret < 0)
668 return ret;
669
670 m = file->private_data;
671 m->private = cell;
672 return 0;
673}
674
675/*
676 * close the file and release the ref to the cell
677 */
678static int afs_proc_cell_servers_release(struct inode *inode,
679 struct file *file)
680{
681 return seq_release(inode, file);
682}
683
684/*
685 * set up the iterator to start reading from the cells list and return the
686 * first item
687 */
688static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
689 __acquires(m->private->servers_lock)
690{
691 struct afs_cell *cell = m->private;
692
693 _enter("cell=%p pos=%Ld", cell, *_pos);
694
695 /* lock the list against modification */
696 read_lock(&cell->servers_lock);
697 return seq_list_start_head(&cell->servers, *_pos);
698}
699
700/*
701 * move to next cell in cells list
702 */
703static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
704 loff_t *_pos)
705{
706 struct afs_cell *cell = p->private;
707
708 _enter("cell=%p pos=%Ld", cell, *_pos);
709 return seq_list_next(v, &cell->servers, _pos);
710}
711
712/*
713 * clean up after reading from the cells list
714 */
715static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
716 __releases(p->private->servers_lock)
717{
718 struct afs_cell *cell = p->private;
719
720 read_unlock(&cell->servers_lock);
721}
722
723/*
724 * display a header line followed by a load of volume lines
725 */
726static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
727{
728 struct afs_cell *cell = m->private;
729 struct afs_server *server = list_entry(v, struct afs_server, link);
730 char ipaddr[20];
731
732 /* display header on line 1 */
733 if (v == &cell->servers) {
734 seq_puts(m, "USE ADDR STATE\n");
735 return 0;
736 }
737
738 /* display one cell per line on subsequent lines */
739 sprintf(ipaddr, "%pI4", &server->addr);
740 seq_printf(m, "%3d %-15.15s %5d\n",
741 atomic_read(&server->usage), ipaddr, server->fs_state);
742
743 return 0;
744}