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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 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};
45
46static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
47 size_t size, loff_t *_pos);
48static ssize_t afs_proc_rootcell_write(struct file *file,
49 const char __user *buf,
50 size_t size, loff_t *_pos);
51
52static const struct file_operations afs_proc_rootcell_fops = {
53 .read = afs_proc_rootcell_read,
54 .write = afs_proc_rootcell_write,
55 .llseek = no_llseek,
56};
57
58static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
59static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
60static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
61 loff_t *pos);
62static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
63static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
64
65static const struct seq_operations afs_proc_cell_volumes_ops = {
66 .start = afs_proc_cell_volumes_start,
67 .next = afs_proc_cell_volumes_next,
68 .stop = afs_proc_cell_volumes_stop,
69 .show = afs_proc_cell_volumes_show,
70};
71
72static const struct file_operations afs_proc_cell_volumes_fops = {
73 .open = afs_proc_cell_volumes_open,
74 .read = seq_read,
75 .llseek = seq_lseek,
76 .release = seq_release,
77};
78
79static int afs_proc_cell_vlservers_open(struct inode *inode,
80 struct file *file);
81static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
82static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
83 loff_t *pos);
84static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
85static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
86
87static const struct seq_operations afs_proc_cell_vlservers_ops = {
88 .start = afs_proc_cell_vlservers_start,
89 .next = afs_proc_cell_vlservers_next,
90 .stop = afs_proc_cell_vlservers_stop,
91 .show = afs_proc_cell_vlservers_show,
92};
93
94static const struct file_operations afs_proc_cell_vlservers_fops = {
95 .open = afs_proc_cell_vlservers_open,
96 .read = seq_read,
97 .llseek = seq_lseek,
98 .release = seq_release,
99};
100
101static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
102static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
103static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
104 loff_t *pos);
105static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
106static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
107
108static const struct seq_operations afs_proc_cell_servers_ops = {
109 .start = afs_proc_cell_servers_start,
110 .next = afs_proc_cell_servers_next,
111 .stop = afs_proc_cell_servers_stop,
112 .show = afs_proc_cell_servers_show,
113};
114
115static const struct file_operations afs_proc_cell_servers_fops = {
116 .open = afs_proc_cell_servers_open,
117 .read = seq_read,
118 .llseek = seq_lseek,
119 .release = seq_release,
120};
121
122/*
123 * initialise the /proc/fs/afs/ directory
124 */
125int afs_proc_init(void)
126{
127 _enter("");
128
129 proc_afs = proc_mkdir("fs/afs", NULL);
130 if (!proc_afs)
131 goto error_dir;
132
133 if (!proc_create("cells", 0644, proc_afs, &afs_proc_cells_fops) ||
134 !proc_create("rootcell", 0644, proc_afs, &afs_proc_rootcell_fops))
135 goto error_tree;
136
137 _leave(" = 0");
138 return 0;
139
140error_tree:
141 remove_proc_subtree("fs/afs", NULL);
142error_dir:
143 _leave(" = -ENOMEM");
144 return -ENOMEM;
145}
146
147/*
148 * clean up the /proc/fs/afs/ directory
149 */
150void afs_proc_cleanup(void)
151{
152 remove_proc_subtree("fs/afs", NULL);
153}
154
155/*
156 * open "/proc/fs/afs/cells" which provides a summary of extant cells
157 */
158static int afs_proc_cells_open(struct inode *inode, struct file *file)
159{
160 struct seq_file *m;
161 int ret;
162
163 ret = seq_open(file, &afs_proc_cells_ops);
164 if (ret < 0)
165 return ret;
166
167 m = file->private_data;
168 m->private = PDE_DATA(inode);
169
170 return 0;
171}
172
173/*
174 * set up the iterator to start reading from the cells list and return the
175 * first item
176 */
177static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
178{
179 /* lock the list against modification */
180 down_read(&afs_proc_cells_sem);
181 return seq_list_start_head(&afs_proc_cells, *_pos);
182}
183
184/*
185 * move to next cell in cells list
186 */
187static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos)
188{
189 return seq_list_next(v, &afs_proc_cells, pos);
190}
191
192/*
193 * clean up after reading from the cells list
194 */
195static void afs_proc_cells_stop(struct seq_file *p, void *v)
196{
197 up_read(&afs_proc_cells_sem);
198}
199
200/*
201 * display a header line followed by a load of cell lines
202 */
203static int afs_proc_cells_show(struct seq_file *m, void *v)
204{
205 struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
206
207 if (v == &afs_proc_cells) {
208 /* display header on line 1 */
209 seq_puts(m, "USE NAME\n");
210 return 0;
211 }
212
213 /* display one cell per line on subsequent lines */
214 seq_printf(m, "%3d %s\n",
215 atomic_read(&cell->usage), cell->name);
216 return 0;
217}
218
219/*
220 * handle writes to /proc/fs/afs/cells
221 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
222 */
223static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
224 size_t size, loff_t *_pos)
225{
226 char *kbuf, *name, *args;
227 int ret;
228
229 /* start by dragging the command into memory */
230 if (size <= 1 || size >= PAGE_SIZE)
231 return -EINVAL;
232
233 kbuf = memdup_user_nul(buf, size);
234 if (IS_ERR(kbuf))
235 return PTR_ERR(kbuf);
236
237 /* trim to first NL */
238 name = memchr(kbuf, '\n', size);
239 if (name)
240 *name = 0;
241
242 /* split into command, name and argslist */
243 name = strchr(kbuf, ' ');
244 if (!name)
245 goto inval;
246 do {
247 *name++ = 0;
248 } while(*name == ' ');
249 if (!*name)
250 goto inval;
251
252 args = strchr(name, ' ');
253 if (!args)
254 goto inval;
255 do {
256 *args++ = 0;
257 } while(*args == ' ');
258 if (!*args)
259 goto inval;
260
261 /* determine command to perform */
262 _debug("cmd=%s name=%s args=%s", kbuf, name, args);
263
264 if (strcmp(kbuf, "add") == 0) {
265 struct afs_cell *cell;
266
267 cell = afs_cell_create(name, strlen(name), args, false);
268 if (IS_ERR(cell)) {
269 ret = PTR_ERR(cell);
270 goto done;
271 }
272
273 afs_put_cell(cell);
274 printk("kAFS: Added new cell '%s'\n", name);
275 } else {
276 goto inval;
277 }
278
279 ret = size;
280
281done:
282 kfree(kbuf);
283 _leave(" = %d", ret);
284 return ret;
285
286inval:
287 ret = -EINVAL;
288 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
289 goto done;
290}
291
292static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
293 size_t size, loff_t *_pos)
294{
295 return 0;
296}
297
298/*
299 * handle writes to /proc/fs/afs/rootcell
300 * - to initialize rootcell: echo "cell.name:192.168.231.14"
301 */
302static ssize_t afs_proc_rootcell_write(struct file *file,
303 const char __user *buf,
304 size_t size, loff_t *_pos)
305{
306 char *kbuf, *s;
307 int ret;
308
309 /* start by dragging the command into memory */
310 if (size <= 1 || size >= PAGE_SIZE)
311 return -EINVAL;
312
313 kbuf = memdup_user_nul(buf, size);
314 if (IS_ERR(kbuf))
315 return PTR_ERR(kbuf);
316
317 /* trim to first NL */
318 s = memchr(kbuf, '\n', size);
319 if (s)
320 *s = 0;
321
322 /* determine command to perform */
323 _debug("rootcell=%s", kbuf);
324
325 ret = afs_cell_init(kbuf);
326 if (ret >= 0)
327 ret = size; /* consume everything, always */
328
329 kfree(kbuf);
330 _leave(" = %d", ret);
331 return ret;
332}
333
334/*
335 * initialise /proc/fs/afs/<cell>/
336 */
337int afs_proc_cell_setup(struct afs_cell *cell)
338{
339 struct proc_dir_entry *dir;
340
341 _enter("%p{%s}", cell, cell->name);
342
343 dir = proc_mkdir(cell->name, proc_afs);
344 if (!dir)
345 goto error_dir;
346
347 if (!proc_create_data("servers", 0, dir,
348 &afs_proc_cell_servers_fops, cell) ||
349 !proc_create_data("vlservers", 0, dir,
350 &afs_proc_cell_vlservers_fops, cell) ||
351 !proc_create_data("volumes", 0, dir,
352 &afs_proc_cell_volumes_fops, cell))
353 goto error_tree;
354
355 _leave(" = 0");
356 return 0;
357
358error_tree:
359 remove_proc_subtree(cell->name, proc_afs);
360error_dir:
361 _leave(" = -ENOMEM");
362 return -ENOMEM;
363}
364
365/*
366 * remove /proc/fs/afs/<cell>/
367 */
368void afs_proc_cell_remove(struct afs_cell *cell)
369{
370 _enter("");
371
372 remove_proc_subtree(cell->name, proc_afs);
373
374 _leave("");
375}
376
377/*
378 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
379 */
380static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
381{
382 struct afs_cell *cell;
383 struct seq_file *m;
384 int ret;
385
386 cell = PDE_DATA(inode);
387 if (!cell)
388 return -ENOENT;
389
390 ret = seq_open(file, &afs_proc_cell_volumes_ops);
391 if (ret < 0)
392 return ret;
393
394 m = file->private_data;
395 m->private = cell;
396
397 return 0;
398}
399
400/*
401 * set up the iterator to start reading from the cells list and return the
402 * first item
403 */
404static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
405{
406 struct afs_cell *cell = m->private;
407
408 _enter("cell=%p pos=%Ld", cell, *_pos);
409
410 /* lock the list against modification */
411 down_read(&cell->vl_sem);
412 return seq_list_start_head(&cell->vl_list, *_pos);
413}
414
415/*
416 * move to next cell in cells list
417 */
418static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
419 loff_t *_pos)
420{
421 struct afs_cell *cell = p->private;
422
423 _enter("cell=%p pos=%Ld", cell, *_pos);
424 return seq_list_next(v, &cell->vl_list, _pos);
425}
426
427/*
428 * clean up after reading from the cells list
429 */
430static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
431{
432 struct afs_cell *cell = p->private;
433
434 up_read(&cell->vl_sem);
435}
436
437static const char afs_vlocation_states[][4] = {
438 [AFS_VL_NEW] = "New",
439 [AFS_VL_CREATING] = "Crt",
440 [AFS_VL_VALID] = "Val",
441 [AFS_VL_NO_VOLUME] = "NoV",
442 [AFS_VL_UPDATING] = "Upd",
443 [AFS_VL_VOLUME_DELETED] = "Del",
444 [AFS_VL_UNCERTAIN] = "Unc",
445};
446
447/*
448 * display a header line followed by a load of volume lines
449 */
450static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
451{
452 struct afs_cell *cell = m->private;
453 struct afs_vlocation *vlocation =
454 list_entry(v, struct afs_vlocation, link);
455
456 /* display header on line 1 */
457 if (v == &cell->vl_list) {
458 seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
459 return 0;
460 }
461
462 /* display one cell per line on subsequent lines */
463 seq_printf(m, "%3d %s %08x %08x %08x %s\n",
464 atomic_read(&vlocation->usage),
465 afs_vlocation_states[vlocation->state],
466 vlocation->vldb.vid[0],
467 vlocation->vldb.vid[1],
468 vlocation->vldb.vid[2],
469 vlocation->vldb.name);
470
471 return 0;
472}
473
474/*
475 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
476 * location server
477 */
478static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
479{
480 struct afs_cell *cell;
481 struct seq_file *m;
482 int ret;
483
484 cell = PDE_DATA(inode);
485 if (!cell)
486 return -ENOENT;
487
488 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
489 if (ret<0)
490 return ret;
491
492 m = file->private_data;
493 m->private = cell;
494
495 return 0;
496}
497
498/*
499 * set up the iterator to start reading from the cells list and return the
500 * first item
501 */
502static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
503{
504 struct afs_cell *cell = m->private;
505 loff_t pos = *_pos;
506
507 _enter("cell=%p pos=%Ld", cell, *_pos);
508
509 /* lock the list against modification */
510 down_read(&cell->vl_sem);
511
512 /* allow for the header line */
513 if (!pos)
514 return (void *) 1;
515 pos--;
516
517 if (pos >= cell->vl_naddrs)
518 return NULL;
519
520 return &cell->vl_addrs[pos];
521}
522
523/*
524 * move to next cell in cells list
525 */
526static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
527 loff_t *_pos)
528{
529 struct afs_cell *cell = p->private;
530 loff_t pos;
531
532 _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
533
534 pos = *_pos;
535 (*_pos)++;
536 if (pos >= cell->vl_naddrs)
537 return NULL;
538
539 return &cell->vl_addrs[pos];
540}
541
542/*
543 * clean up after reading from the cells list
544 */
545static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
546{
547 struct afs_cell *cell = p->private;
548
549 up_read(&cell->vl_sem);
550}
551
552/*
553 * display a header line followed by a load of volume lines
554 */
555static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
556{
557 struct in_addr *addr = v;
558
559 /* display header on line 1 */
560 if (v == (struct in_addr *) 1) {
561 seq_puts(m, "ADDRESS\n");
562 return 0;
563 }
564
565 /* display one cell per line on subsequent lines */
566 seq_printf(m, "%pI4\n", &addr->s_addr);
567 return 0;
568}
569
570/*
571 * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
572 * servers
573 */
574static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
575{
576 struct afs_cell *cell;
577 struct seq_file *m;
578 int ret;
579
580 cell = PDE_DATA(inode);
581 if (!cell)
582 return -ENOENT;
583
584 ret = seq_open(file, &afs_proc_cell_servers_ops);
585 if (ret < 0)
586 return ret;
587
588 m = file->private_data;
589 m->private = cell;
590 return 0;
591}
592
593/*
594 * set up the iterator to start reading from the cells list and return the
595 * first item
596 */
597static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
598 __acquires(m->private->servers_lock)
599{
600 struct afs_cell *cell = m->private;
601
602 _enter("cell=%p pos=%Ld", cell, *_pos);
603
604 /* lock the list against modification */
605 read_lock(&cell->servers_lock);
606 return seq_list_start_head(&cell->servers, *_pos);
607}
608
609/*
610 * move to next cell in cells list
611 */
612static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
613 loff_t *_pos)
614{
615 struct afs_cell *cell = p->private;
616
617 _enter("cell=%p pos=%Ld", cell, *_pos);
618 return seq_list_next(v, &cell->servers, _pos);
619}
620
621/*
622 * clean up after reading from the cells list
623 */
624static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
625 __releases(p->private->servers_lock)
626{
627 struct afs_cell *cell = p->private;
628
629 read_unlock(&cell->servers_lock);
630}
631
632/*
633 * display a header line followed by a load of volume lines
634 */
635static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
636{
637 struct afs_cell *cell = m->private;
638 struct afs_server *server = list_entry(v, struct afs_server, link);
639 char ipaddr[20];
640
641 /* display header on line 1 */
642 if (v == &cell->servers) {
643 seq_puts(m, "USE ADDR STATE\n");
644 return 0;
645 }
646
647 /* display one cell per line on subsequent lines */
648 sprintf(ipaddr, "%pI4", &server->addr);
649 seq_printf(m, "%3d %-15.15s %5d\n",
650 atomic_read(&server->usage), ipaddr, server->fs_state);
651
652 return 0;
653}
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 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 /* display one cell per line on subsequent lines */
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
57static 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
64static 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
69static void afs_proc_cells_stop(struct seq_file *m, void *v)
70 __releases(rcu)
71{
72 rcu_read_unlock();
73}
74
75static 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 * handle writes to /proc/fs/afs/cells
84 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
85 */
86static 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 /* trim to first NL */
94 name = memchr(buf, '\n', size);
95 if (name)
96 *name = 0;
97
98 /* split into command, name and argslist */
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 /* determine command to perform */
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
137done:
138 _leave(" = %d", ret);
139 return ret;
140
141inval:
142 ret = -EINVAL;
143 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
144 goto done;
145}
146
147/*
148 * Display the name of the current workstation cell.
149 */
150static 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 * 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_cell *cell = PDE_DATA(file_inode(m->file));
212 struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
213
214 /* Display header on line 1 */
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
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 read_lock(&cell->proc_lock);
233 return seq_list_start_head(&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_list_next(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 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
248
249 read_unlock(&cell->proc_lock);
250}
251
252static 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
259static 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
269static 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 * Display the list of Volume Location servers we're using for a cell.
283 */
284static 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
317static 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
341static 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
357static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
358 __releases(rcu)
359{
360 rcu_read_unlock();
361}
362
363static 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 * Display the list of fileservers we're using within a namespace.
372 */
373static 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
398static 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
405static 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
410static void afs_proc_servers_stop(struct seq_file *m, void *v)
411 __releases(rcu)
412{
413 rcu_read_unlock();
414}
415
416static 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 * Display the list of strings that may be substituted for the @sys pathname
425 * macro.
426 */
427static 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
438static 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
452static 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
463static 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
471static 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 * Allow the @sys substitution to be configured.
480 */
481static 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 /* Protect against recursion */
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;
546out:
547 afs_put_sysnames(kill);
548 return ret;
549
550invalid:
551 ret = -EINVAL;
552error:
553 goto out;
554}
555
556void 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 * Display general per-net namespace statistics
570 */
571static 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 * initialise /proc/fs/afs/<cell>/
601 */
602int 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
626error_tree:
627 remove_proc_subtree(cell->name, net->proc_afs);
628error_dir:
629 _leave(" = -ENOMEM");
630 return -ENOMEM;
631}
632
633/*
634 * remove /proc/fs/afs/<cell>/
635 */
636void 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 * initialise the /proc/fs/afs/ directory
647 */
648int 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
681error_tree:
682 proc_remove(p);
683error_dir:
684 _leave(" = -ENOMEM");
685 return -ENOMEM;
686}
687
688/*
689 * clean up the /proc/fs/afs/ directory
690 */
691void afs_proc_cleanup(struct afs_net *net)
692{
693 proc_remove(net->proc_afs);
694 net->proc_afs = NULL;
695}