This source file includes following definitions.
- afs_seq2net
- afs_seq2net_single
- afs_proc_cells_show
- afs_proc_cells_start
- afs_proc_cells_next
- afs_proc_cells_stop
- afs_proc_cells_write
- afs_proc_rootcell_show
- afs_proc_rootcell_write
- afs_proc_cell_volumes_show
- afs_proc_cell_volumes_start
- afs_proc_cell_volumes_next
- afs_proc_cell_volumes_stop
- afs_proc_cell_vlservers_show
- afs_proc_cell_vlservers_start
- afs_proc_cell_vlservers_next
- afs_proc_cell_vlservers_stop
- afs_proc_servers_show
- afs_proc_servers_start
- afs_proc_servers_next
- afs_proc_servers_stop
- afs_proc_sysname_show
- afs_proc_sysname_start
- afs_proc_sysname_next
- afs_proc_sysname_stop
- afs_proc_sysname_write
- afs_put_sysnames
- afs_proc_stats_show
- afs_proc_cell_setup
- afs_proc_cell_remove
- afs_proc_init
- afs_proc_cleanup
1
2
3
4
5
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
16 struct afs_vl_seq_net_private {
17 struct seq_net_private seq;
18 struct afs_vlserver_list *vllist;
19 };
20
21 static inline struct afs_net *afs_seq2net(struct seq_file *m)
22 {
23 return afs_net(seq_file_net(m));
24 }
25
26 static 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
33
34 static 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
41 seq_puts(m, "USE TTL SV 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
49 seq_printf(m, "%3u %6lld %2u %s\n",
50 atomic_read(&cell->usage),
51 cell->dns_expiry - ktime_get_real_seconds(),
52 vllist->nr_servers,
53 cell->name);
54 return 0;
55 }
56
57 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
58 __acquires(rcu)
59 {
60 rcu_read_lock();
61 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
62 }
63
64 static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
65 {
66 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
67 }
68
69 static void afs_proc_cells_stop(struct seq_file *m, void *v)
70 __releases(rcu)
71 {
72 rcu_read_unlock();
73 }
74
75 static const struct seq_operations afs_proc_cells_ops = {
76 .start = afs_proc_cells_start,
77 .next = afs_proc_cells_next,
78 .stop = afs_proc_cells_stop,
79 .show = afs_proc_cells_show,
80 };
81
82
83
84
85
86 static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
87 {
88 struct seq_file *m = file->private_data;
89 struct afs_net *net = afs_seq2net(m);
90 char *name, *args;
91 int ret;
92
93
94 name = memchr(buf, '\n', size);
95 if (name)
96 *name = 0;
97
98
99 name = strchr(buf, ' ');
100 if (!name)
101 goto inval;
102 do {
103 *name++ = 0;
104 } while(*name == ' ');
105 if (!*name)
106 goto inval;
107
108 args = strchr(name, ' ');
109 if (args) {
110 do {
111 *args++ = 0;
112 } while(*args == ' ');
113 if (!*args)
114 goto inval;
115 }
116
117
118 _debug("cmd=%s name=%s args=%s", buf, name, args);
119
120 if (strcmp(buf, "add") == 0) {
121 struct afs_cell *cell;
122
123 cell = afs_lookup_cell(net, name, strlen(name), args, true);
124 if (IS_ERR(cell)) {
125 ret = PTR_ERR(cell);
126 goto done;
127 }
128
129 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
130 afs_put_cell(net, cell);
131 } else {
132 goto inval;
133 }
134
135 ret = 0;
136
137 done:
138 _leave(" = %d", ret);
139 return ret;
140
141 inval:
142 ret = -EINVAL;
143 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
144 goto done;
145 }
146
147
148
149
150 static int afs_proc_rootcell_show(struct seq_file *m, void *v)
151 {
152 struct afs_cell *cell;
153 struct afs_net *net;
154
155 net = afs_seq2net_single(m);
156 if (rcu_access_pointer(net->ws_cell)) {
157 rcu_read_lock();
158 cell = rcu_dereference(net->ws_cell);
159 if (cell)
160 seq_printf(m, "%s\n", cell->name);
161 rcu_read_unlock();
162 }
163 return 0;
164 }
165
166
167
168
169
170
171
172 static 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
186 s = memchr(buf, '\n', size);
187 if (s)
188 *s = 0;
189
190
191 _debug("rootcell=%s", buf);
192
193 ret = afs_cell_init(net, buf);
194
195 out:
196 _leave(" = %d", ret);
197 return ret;
198 }
199
200 static const char afs_vol_types[3][3] = {
201 [AFSVL_RWVOL] = "RW",
202 [AFSVL_ROVOL] = "RO",
203 [AFSVL_BACKVOL] = "BK",
204 };
205
206
207
208
209 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
210 {
211 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
212 struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
213
214
215 if (v == &cell->proc_volumes) {
216 seq_puts(m, "USE VID TY\n");
217 return 0;
218 }
219
220 seq_printf(m, "%3d %08llx %s\n",
221 atomic_read(&vol->usage), vol->vid,
222 afs_vol_types[vol->type]);
223
224 return 0;
225 }
226
227 static 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 read_lock(&cell->proc_lock);
233 return seq_list_start_head(&cell->proc_volumes, *_pos);
234 }
235
236 static 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_list_next(v, &cell->proc_volumes, _pos);
242 }
243
244 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
245 __releases(cell->proc_lock)
246 {
247 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
248
249 read_unlock(&cell->proc_lock);
250 }
251
252 static const struct seq_operations afs_proc_cell_volumes_ops = {
253 .start = afs_proc_cell_volumes_start,
254 .next = afs_proc_cell_volumes_next,
255 .stop = afs_proc_cell_volumes_stop,
256 .show = afs_proc_cell_volumes_show,
257 };
258
259 static const char *const dns_record_sources[NR__dns_record_source + 1] = {
260 [DNS_RECORD_UNAVAILABLE] = "unav",
261 [DNS_RECORD_FROM_CONFIG] = "cfg",
262 [DNS_RECORD_FROM_DNS_A] = "A",
263 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
264 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
265 [DNS_RECORD_FROM_NSS] = "nss",
266 [NR__dns_record_source] = "[weird]"
267 };
268
269 static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
270 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
271 [DNS_LOOKUP_GOOD] = "good",
272 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
273 [DNS_LOOKUP_BAD] = "bad",
274 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
275 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
276 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
277 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
278 [NR__dns_lookup_status] = "[weird]"
279 };
280
281
282
283
284 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
285 {
286 const struct afs_vl_seq_net_private *priv = m->private;
287 const struct afs_vlserver_list *vllist = priv->vllist;
288 const struct afs_vlserver_entry *entry;
289 const struct afs_vlserver *vlserver;
290 const struct afs_addr_list *alist;
291 int i;
292
293 if (v == SEQ_START_TOKEN) {
294 seq_printf(m, "# source %s, status %s\n",
295 dns_record_sources[vllist ? vllist->source : 0],
296 dns_lookup_statuses[vllist ? vllist->status : 0]);
297 return 0;
298 }
299
300 entry = v;
301 vlserver = entry->server;
302 alist = rcu_dereference(vlserver->addresses);
303
304 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
305 vlserver->name, entry->priority, entry->weight,
306 dns_record_sources[alist ? alist->source : entry->source],
307 dns_lookup_statuses[alist ? alist->status : entry->status]);
308 if (alist) {
309 for (i = 0; i < alist->nr_addrs; i++)
310 seq_printf(m, " %c %pISpc\n",
311 alist->preferred == i ? '>' : '-',
312 &alist->addrs[i].transport);
313 }
314 return 0;
315 }
316
317 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
318 __acquires(rcu)
319 {
320 struct afs_vl_seq_net_private *priv = m->private;
321 struct afs_vlserver_list *vllist;
322 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
323 loff_t pos = *_pos;
324
325 rcu_read_lock();
326
327 vllist = rcu_dereference(cell->vl_servers);
328 priv->vllist = vllist;
329
330 if (pos < 0)
331 *_pos = pos = 0;
332 if (pos == 0)
333 return SEQ_START_TOKEN;
334
335 if (pos - 1 >= vllist->nr_servers)
336 return NULL;
337
338 return &vllist->servers[pos - 1];
339 }
340
341 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
342 loff_t *_pos)
343 {
344 struct afs_vl_seq_net_private *priv = m->private;
345 struct afs_vlserver_list *vllist = priv->vllist;
346 loff_t pos;
347
348 pos = *_pos;
349 pos++;
350 *_pos = pos;
351 if (!vllist || pos - 1 >= vllist->nr_servers)
352 return NULL;
353
354 return &vllist->servers[pos - 1];
355 }
356
357 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
358 __releases(rcu)
359 {
360 rcu_read_unlock();
361 }
362
363 static const struct seq_operations afs_proc_cell_vlservers_ops = {
364 .start = afs_proc_cell_vlservers_start,
365 .next = afs_proc_cell_vlservers_next,
366 .stop = afs_proc_cell_vlservers_stop,
367 .show = afs_proc_cell_vlservers_show,
368 };
369
370
371
372
373 static int afs_proc_servers_show(struct seq_file *m, void *v)
374 {
375 struct afs_server *server;
376 struct afs_addr_list *alist;
377 int i;
378
379 if (v == SEQ_START_TOKEN) {
380 seq_puts(m, "UUID USE ADDR\n");
381 return 0;
382 }
383
384 server = list_entry(v, struct afs_server, proc_link);
385 alist = rcu_dereference(server->addresses);
386 seq_printf(m, "%pU %3d %pISpc%s\n",
387 &server->uuid,
388 atomic_read(&server->usage),
389 &alist->addrs[0].transport,
390 alist->preferred == 0 ? "*" : "");
391 for (i = 1; i < alist->nr_addrs; i++)
392 seq_printf(m, " %pISpc%s\n",
393 &alist->addrs[i].transport,
394 alist->preferred == i ? "*" : "");
395 return 0;
396 }
397
398 static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
399 __acquires(rcu)
400 {
401 rcu_read_lock();
402 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
403 }
404
405 static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
406 {
407 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
408 }
409
410 static void afs_proc_servers_stop(struct seq_file *m, void *v)
411 __releases(rcu)
412 {
413 rcu_read_unlock();
414 }
415
416 static const struct seq_operations afs_proc_servers_ops = {
417 .start = afs_proc_servers_start,
418 .next = afs_proc_servers_next,
419 .stop = afs_proc_servers_stop,
420 .show = afs_proc_servers_show,
421 };
422
423
424
425
426
427 static int afs_proc_sysname_show(struct seq_file *m, void *v)
428 {
429 struct afs_net *net = afs_seq2net(m);
430 struct afs_sysnames *sysnames = net->sysnames;
431 unsigned int i = (unsigned long)v - 1;
432
433 if (i < sysnames->nr)
434 seq_printf(m, "%s\n", sysnames->subs[i]);
435 return 0;
436 }
437
438 static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
439 __acquires(&net->sysnames_lock)
440 {
441 struct afs_net *net = afs_seq2net(m);
442 struct afs_sysnames *names;
443
444 read_lock(&net->sysnames_lock);
445
446 names = net->sysnames;
447 if (*pos >= names->nr)
448 return NULL;
449 return (void *)(unsigned long)(*pos + 1);
450 }
451
452 static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
453 {
454 struct afs_net *net = afs_seq2net(m);
455 struct afs_sysnames *names = net->sysnames;
456
457 *pos += 1;
458 if (*pos >= names->nr)
459 return NULL;
460 return (void *)(unsigned long)(*pos + 1);
461 }
462
463 static void afs_proc_sysname_stop(struct seq_file *m, void *v)
464 __releases(&net->sysnames_lock)
465 {
466 struct afs_net *net = afs_seq2net(m);
467
468 read_unlock(&net->sysnames_lock);
469 }
470
471 static const struct seq_operations afs_proc_sysname_ops = {
472 .start = afs_proc_sysname_start,
473 .next = afs_proc_sysname_next,
474 .stop = afs_proc_sysname_stop,
475 .show = afs_proc_sysname_show,
476 };
477
478
479
480
481 static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
482 {
483 struct afs_sysnames *sysnames, *kill;
484 struct seq_file *m = file->private_data;
485 struct afs_net *net = afs_seq2net(m);
486 char *s, *p, *sub;
487 int ret, len;
488
489 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
490 if (!sysnames)
491 return -ENOMEM;
492 refcount_set(&sysnames->usage, 1);
493 kill = sysnames;
494
495 p = buf;
496 while ((s = strsep(&p, " \t\n"))) {
497 len = strlen(s);
498 if (len == 0)
499 continue;
500 ret = -ENAMETOOLONG;
501 if (len >= AFSNAMEMAX)
502 goto error;
503
504 if (len >= 4 &&
505 s[len - 4] == '@' &&
506 s[len - 3] == 's' &&
507 s[len - 2] == 'y' &&
508 s[len - 1] == 's')
509
510 goto invalid;
511
512 if (s[0] == '.' &&
513 (len < 2 || (len == 2 && s[1] == '.')))
514 goto invalid;
515
516 if (memchr(s, '/', len))
517 goto invalid;
518
519 ret = -EFBIG;
520 if (sysnames->nr >= AFS_NR_SYSNAME)
521 goto out;
522
523 if (strcmp(s, afs_init_sysname) == 0) {
524 sub = (char *)afs_init_sysname;
525 } else {
526 ret = -ENOMEM;
527 sub = kmemdup(s, len + 1, GFP_KERNEL);
528 if (!sub)
529 goto out;
530 }
531
532 sysnames->subs[sysnames->nr] = sub;
533 sysnames->nr++;
534 }
535
536 if (sysnames->nr == 0) {
537 sysnames->subs[0] = sysnames->blank;
538 sysnames->nr++;
539 }
540
541 write_lock(&net->sysnames_lock);
542 kill = net->sysnames;
543 net->sysnames = sysnames;
544 write_unlock(&net->sysnames_lock);
545 ret = 0;
546 out:
547 afs_put_sysnames(kill);
548 return ret;
549
550 invalid:
551 ret = -EINVAL;
552 error:
553 goto out;
554 }
555
556 void afs_put_sysnames(struct afs_sysnames *sysnames)
557 {
558 int i;
559
560 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
561 for (i = 0; i < sysnames->nr; i++)
562 if (sysnames->subs[i] != afs_init_sysname &&
563 sysnames->subs[i] != sysnames->blank)
564 kfree(sysnames->subs[i]);
565 }
566 }
567
568
569
570
571 static int afs_proc_stats_show(struct seq_file *m, void *v)
572 {
573 struct afs_net *net = afs_seq2net_single(m);
574
575 seq_puts(m, "kAFS statistics\n");
576
577 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
578 atomic_read(&net->n_lookup),
579 atomic_read(&net->n_reval),
580 atomic_read(&net->n_inval),
581 atomic_read(&net->n_relpg));
582
583 seq_printf(m, "dir-data: rdpg=%u\n",
584 atomic_read(&net->n_read_dir));
585
586 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
587 atomic_read(&net->n_dir_cr),
588 atomic_read(&net->n_dir_rm));
589
590 seq_printf(m, "file-rd : n=%u nb=%lu\n",
591 atomic_read(&net->n_fetches),
592 atomic_long_read(&net->n_fetch_bytes));
593 seq_printf(m, "file-wr : n=%u nb=%lu\n",
594 atomic_read(&net->n_stores),
595 atomic_long_read(&net->n_store_bytes));
596 return 0;
597 }
598
599
600
601
602 int afs_proc_cell_setup(struct afs_cell *cell)
603 {
604 struct proc_dir_entry *dir;
605 struct afs_net *net = cell->net;
606
607 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
608
609 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
610 if (!dir)
611 goto error_dir;
612
613 if (!proc_create_net_data("vlservers", 0444, dir,
614 &afs_proc_cell_vlservers_ops,
615 sizeof(struct afs_vl_seq_net_private),
616 cell) ||
617 !proc_create_net_data("volumes", 0444, dir,
618 &afs_proc_cell_volumes_ops,
619 sizeof(struct seq_net_private),
620 cell))
621 goto error_tree;
622
623 _leave(" = 0");
624 return 0;
625
626 error_tree:
627 remove_proc_subtree(cell->name, net->proc_afs);
628 error_dir:
629 _leave(" = -ENOMEM");
630 return -ENOMEM;
631 }
632
633
634
635
636 void afs_proc_cell_remove(struct afs_cell *cell)
637 {
638 struct afs_net *net = cell->net;
639
640 _enter("");
641 remove_proc_subtree(cell->name, net->proc_afs);
642 _leave("");
643 }
644
645
646
647
648 int afs_proc_init(struct afs_net *net)
649 {
650 struct proc_dir_entry *p;
651
652 _enter("");
653
654 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
655 if (!p)
656 goto error_dir;
657
658 if (!proc_create_net_data_write("cells", 0644, p,
659 &afs_proc_cells_ops,
660 afs_proc_cells_write,
661 sizeof(struct seq_net_private),
662 NULL) ||
663 !proc_create_net_single_write("rootcell", 0644, p,
664 afs_proc_rootcell_show,
665 afs_proc_rootcell_write,
666 NULL) ||
667 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
668 sizeof(struct seq_net_private)) ||
669 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
670 !proc_create_net_data_write("sysname", 0644, p,
671 &afs_proc_sysname_ops,
672 afs_proc_sysname_write,
673 sizeof(struct seq_net_private),
674 NULL))
675 goto error_tree;
676
677 net->proc_afs = p;
678 _leave(" = 0");
679 return 0;
680
681 error_tree:
682 proc_remove(p);
683 error_dir:
684 _leave(" = -ENOMEM");
685 return -ENOMEM;
686 }
687
688
689
690
691 void afs_proc_cleanup(struct afs_net *net)
692 {
693 proc_remove(net->proc_afs);
694 net->proc_afs = NULL;
695 }