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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 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 %6lld %2u %2u %s\n",
50 atomic_read(&cell->usage),
51 cell->dns_expiry - ktime_get_real_seconds(),
52 vllist->nr_servers,
53 cell->state,
54 cell->name);
55 return 0;
56}
57
58static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
59 __acquires(rcu)
60{
61 rcu_read_lock();
62 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
63}
64
65static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
66{
67 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
68}
69
70static void afs_proc_cells_stop(struct seq_file *m, void *v)
71 __releases(rcu)
72{
73 rcu_read_unlock();
74}
75
76static const struct seq_operations afs_proc_cells_ops = {
77 .start = afs_proc_cells_start,
78 .next = afs_proc_cells_next,
79 .stop = afs_proc_cells_stop,
80 .show = afs_proc_cells_show,
81};
82
83/*
84 * handle writes to /proc/fs/afs/cells
85 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
86 */
87static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
88{
89 struct seq_file *m = file->private_data;
90 struct afs_net *net = afs_seq2net(m);
91 char *name, *args;
92 int ret;
93
94 /* trim to first NL */
95 name = memchr(buf, '\n', size);
96 if (name)
97 *name = 0;
98
99 /* split into command, name and argslist */
100 name = strchr(buf, ' ');
101 if (!name)
102 goto inval;
103 do {
104 *name++ = 0;
105 } while(*name == ' ');
106 if (!*name)
107 goto inval;
108
109 args = strchr(name, ' ');
110 if (args) {
111 do {
112 *args++ = 0;
113 } while(*args == ' ');
114 if (!*args)
115 goto inval;
116 }
117
118 /* determine command to perform */
119 _debug("cmd=%s name=%s args=%s", buf, name, args);
120
121 if (strcmp(buf, "add") == 0) {
122 struct afs_cell *cell;
123
124 cell = afs_lookup_cell(net, name, strlen(name), args, true);
125 if (IS_ERR(cell)) {
126 ret = PTR_ERR(cell);
127 goto done;
128 }
129
130 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
131 afs_put_cell(net, cell);
132 } else {
133 goto inval;
134 }
135
136 ret = 0;
137
138done:
139 _leave(" = %d", ret);
140 return ret;
141
142inval:
143 ret = -EINVAL;
144 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
145 goto done;
146}
147
148/*
149 * Display the name of the current workstation cell.
150 */
151static int afs_proc_rootcell_show(struct seq_file *m, void *v)
152{
153 struct afs_cell *cell;
154 struct afs_net *net;
155
156 net = afs_seq2net_single(m);
157 if (rcu_access_pointer(net->ws_cell)) {
158 rcu_read_lock();
159 cell = rcu_dereference(net->ws_cell);
160 if (cell)
161 seq_printf(m, "%s\n", cell->name);
162 rcu_read_unlock();
163 }
164 return 0;
165}
166
167/*
168 * Set the current workstation cell and optionally supply its list of volume
169 * location servers.
170 *
171 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
172 */
173static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
174{
175 struct seq_file *m = file->private_data;
176 struct afs_net *net = afs_seq2net_single(m);
177 char *s;
178 int ret;
179
180 ret = -EINVAL;
181 if (buf[0] == '.')
182 goto out;
183 if (memchr(buf, '/', size))
184 goto out;
185
186 /* trim to first NL */
187 s = memchr(buf, '\n', size);
188 if (s)
189 *s = 0;
190
191 /* determine command to perform */
192 _debug("rootcell=%s", buf);
193
194 ret = afs_cell_init(net, buf);
195
196out:
197 _leave(" = %d", ret);
198 return ret;
199}
200
201static const char afs_vol_types[3][3] = {
202 [AFSVL_RWVOL] = "RW",
203 [AFSVL_ROVOL] = "RO",
204 [AFSVL_BACKVOL] = "BK",
205};
206
207/*
208 * Display the list of volumes known to a cell.
209 */
210static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
211{
212 struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
213
214 /* Display header on line 1 */
215 if (v == SEQ_START_TOKEN) {
216 seq_puts(m, "USE VID TY NAME\n");
217 return 0;
218 }
219
220 seq_printf(m, "%3d %08llx %s %s\n",
221 atomic_read(&vol->usage), vol->vid,
222 afs_vol_types[vol->type],
223 vol->name);
224
225 return 0;
226}
227
228static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
229 __acquires(cell->proc_lock)
230{
231 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
232
233 rcu_read_lock();
234 return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
235}
236
237static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
238 loff_t *_pos)
239{
240 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
241
242 return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
243}
244
245static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
246 __releases(cell->proc_lock)
247{
248 rcu_read_unlock();
249}
250
251static const struct seq_operations afs_proc_cell_volumes_ops = {
252 .start = afs_proc_cell_volumes_start,
253 .next = afs_proc_cell_volumes_next,
254 .stop = afs_proc_cell_volumes_stop,
255 .show = afs_proc_cell_volumes_show,
256};
257
258static const char *const dns_record_sources[NR__dns_record_source + 1] = {
259 [DNS_RECORD_UNAVAILABLE] = "unav",
260 [DNS_RECORD_FROM_CONFIG] = "cfg",
261 [DNS_RECORD_FROM_DNS_A] = "A",
262 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
263 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
264 [DNS_RECORD_FROM_NSS] = "nss",
265 [NR__dns_record_source] = "[weird]"
266};
267
268static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
269 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
270 [DNS_LOOKUP_GOOD] = "good",
271 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
272 [DNS_LOOKUP_BAD] = "bad",
273 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
274 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
275 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
276 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
277 [NR__dns_lookup_status] = "[weird]"
278};
279
280/*
281 * Display the list of Volume Location servers we're using for a cell.
282 */
283static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
284{
285 const struct afs_vl_seq_net_private *priv = m->private;
286 const struct afs_vlserver_list *vllist = priv->vllist;
287 const struct afs_vlserver_entry *entry;
288 const struct afs_vlserver *vlserver;
289 const struct afs_addr_list *alist;
290 int i;
291
292 if (v == SEQ_START_TOKEN) {
293 seq_printf(m, "# source %s, status %s\n",
294 dns_record_sources[vllist ? vllist->source : 0],
295 dns_lookup_statuses[vllist ? vllist->status : 0]);
296 return 0;
297 }
298
299 entry = v;
300 vlserver = entry->server;
301 alist = rcu_dereference(vlserver->addresses);
302
303 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
304 vlserver->name, entry->priority, entry->weight,
305 dns_record_sources[alist ? alist->source : entry->source],
306 dns_lookup_statuses[alist ? alist->status : entry->status]);
307 if (alist) {
308 for (i = 0; i < alist->nr_addrs; i++)
309 seq_printf(m, " %c %pISpc\n",
310 alist->preferred == i ? '>' : '-',
311 &alist->addrs[i].transport);
312 }
313 seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
314 seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
315 vlserver->probe.flags, vlserver->probe.error,
316 vlserver->probe.abort_code,
317 atomic_read(&vlserver->probe_outstanding));
318 return 0;
319}
320
321static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
322 __acquires(rcu)
323{
324 struct afs_vl_seq_net_private *priv = m->private;
325 struct afs_vlserver_list *vllist;
326 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
327 loff_t pos = *_pos;
328
329 rcu_read_lock();
330
331 vllist = rcu_dereference(cell->vl_servers);
332 priv->vllist = vllist;
333
334 if (pos < 0)
335 *_pos = pos = 0;
336 if (pos == 0)
337 return SEQ_START_TOKEN;
338
339 if (pos - 1 >= vllist->nr_servers)
340 return NULL;
341
342 return &vllist->servers[pos - 1];
343}
344
345static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
346 loff_t *_pos)
347{
348 struct afs_vl_seq_net_private *priv = m->private;
349 struct afs_vlserver_list *vllist = priv->vllist;
350 loff_t pos;
351
352 pos = *_pos;
353 pos++;
354 *_pos = pos;
355 if (!vllist || pos - 1 >= vllist->nr_servers)
356 return NULL;
357
358 return &vllist->servers[pos - 1];
359}
360
361static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
362 __releases(rcu)
363{
364 rcu_read_unlock();
365}
366
367static const struct seq_operations afs_proc_cell_vlservers_ops = {
368 .start = afs_proc_cell_vlservers_start,
369 .next = afs_proc_cell_vlservers_next,
370 .stop = afs_proc_cell_vlservers_stop,
371 .show = afs_proc_cell_vlservers_show,
372};
373
374/*
375 * Display the list of fileservers we're using within a namespace.
376 */
377static int afs_proc_servers_show(struct seq_file *m, void *v)
378{
379 struct afs_server *server;
380 struct afs_addr_list *alist;
381 int i;
382
383 if (v == SEQ_START_TOKEN) {
384 seq_puts(m, "UUID REF ACT\n");
385 return 0;
386 }
387
388 server = list_entry(v, struct afs_server, proc_link);
389 alist = rcu_dereference(server->addresses);
390 seq_printf(m, "%pU %3d %3d\n",
391 &server->uuid,
392 atomic_read(&server->ref),
393 atomic_read(&server->active));
394 seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n",
395 server->flags, server->rtt, server->cb_s_break);
396 seq_printf(m, " - probe: last=%d out=%d\n",
397 (int)(jiffies - server->probed_at) / HZ,
398 atomic_read(&server->probe_outstanding));
399 seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n",
400 alist->version, alist->responded, alist->failed);
401 for (i = 0; i < alist->nr_addrs; i++)
402 seq_printf(m, " [%x] %pISpc%s\n",
403 i, &alist->addrs[i].transport,
404 alist->preferred == i ? "*" : "");
405 return 0;
406}
407
408static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
409 __acquires(rcu)
410{
411 rcu_read_lock();
412 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
413}
414
415static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
416{
417 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
418}
419
420static void afs_proc_servers_stop(struct seq_file *m, void *v)
421 __releases(rcu)
422{
423 rcu_read_unlock();
424}
425
426static const struct seq_operations afs_proc_servers_ops = {
427 .start = afs_proc_servers_start,
428 .next = afs_proc_servers_next,
429 .stop = afs_proc_servers_stop,
430 .show = afs_proc_servers_show,
431};
432
433/*
434 * Display the list of strings that may be substituted for the @sys pathname
435 * macro.
436 */
437static int afs_proc_sysname_show(struct seq_file *m, void *v)
438{
439 struct afs_net *net = afs_seq2net(m);
440 struct afs_sysnames *sysnames = net->sysnames;
441 unsigned int i = (unsigned long)v - 1;
442
443 if (i < sysnames->nr)
444 seq_printf(m, "%s\n", sysnames->subs[i]);
445 return 0;
446}
447
448static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
449 __acquires(&net->sysnames_lock)
450{
451 struct afs_net *net = afs_seq2net(m);
452 struct afs_sysnames *names;
453
454 read_lock(&net->sysnames_lock);
455
456 names = net->sysnames;
457 if (*pos >= names->nr)
458 return NULL;
459 return (void *)(unsigned long)(*pos + 1);
460}
461
462static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
463{
464 struct afs_net *net = afs_seq2net(m);
465 struct afs_sysnames *names = net->sysnames;
466
467 *pos += 1;
468 if (*pos >= names->nr)
469 return NULL;
470 return (void *)(unsigned long)(*pos + 1);
471}
472
473static void afs_proc_sysname_stop(struct seq_file *m, void *v)
474 __releases(&net->sysnames_lock)
475{
476 struct afs_net *net = afs_seq2net(m);
477
478 read_unlock(&net->sysnames_lock);
479}
480
481static const struct seq_operations afs_proc_sysname_ops = {
482 .start = afs_proc_sysname_start,
483 .next = afs_proc_sysname_next,
484 .stop = afs_proc_sysname_stop,
485 .show = afs_proc_sysname_show,
486};
487
488/*
489 * Allow the @sys substitution to be configured.
490 */
491static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
492{
493 struct afs_sysnames *sysnames, *kill;
494 struct seq_file *m = file->private_data;
495 struct afs_net *net = afs_seq2net(m);
496 char *s, *p, *sub;
497 int ret, len;
498
499 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
500 if (!sysnames)
501 return -ENOMEM;
502 refcount_set(&sysnames->usage, 1);
503 kill = sysnames;
504
505 p = buf;
506 while ((s = strsep(&p, " \t\n"))) {
507 len = strlen(s);
508 if (len == 0)
509 continue;
510 ret = -ENAMETOOLONG;
511 if (len >= AFSNAMEMAX)
512 goto error;
513
514 if (len >= 4 &&
515 s[len - 4] == '@' &&
516 s[len - 3] == 's' &&
517 s[len - 2] == 'y' &&
518 s[len - 1] == 's')
519 /* Protect against recursion */
520 goto invalid;
521
522 if (s[0] == '.' &&
523 (len < 2 || (len == 2 && s[1] == '.')))
524 goto invalid;
525
526 if (memchr(s, '/', len))
527 goto invalid;
528
529 ret = -EFBIG;
530 if (sysnames->nr >= AFS_NR_SYSNAME)
531 goto out;
532
533 if (strcmp(s, afs_init_sysname) == 0) {
534 sub = (char *)afs_init_sysname;
535 } else {
536 ret = -ENOMEM;
537 sub = kmemdup(s, len + 1, GFP_KERNEL);
538 if (!sub)
539 goto out;
540 }
541
542 sysnames->subs[sysnames->nr] = sub;
543 sysnames->nr++;
544 }
545
546 if (sysnames->nr == 0) {
547 sysnames->subs[0] = sysnames->blank;
548 sysnames->nr++;
549 }
550
551 write_lock(&net->sysnames_lock);
552 kill = net->sysnames;
553 net->sysnames = sysnames;
554 write_unlock(&net->sysnames_lock);
555 ret = 0;
556out:
557 afs_put_sysnames(kill);
558 return ret;
559
560invalid:
561 ret = -EINVAL;
562error:
563 goto out;
564}
565
566void afs_put_sysnames(struct afs_sysnames *sysnames)
567{
568 int i;
569
570 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
571 for (i = 0; i < sysnames->nr; i++)
572 if (sysnames->subs[i] != afs_init_sysname &&
573 sysnames->subs[i] != sysnames->blank)
574 kfree(sysnames->subs[i]);
575 kfree(sysnames);
576 }
577}
578
579/*
580 * Display general per-net namespace statistics
581 */
582static int afs_proc_stats_show(struct seq_file *m, void *v)
583{
584 struct afs_net *net = afs_seq2net_single(m);
585
586 seq_puts(m, "kAFS statistics\n");
587
588 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
589 atomic_read(&net->n_lookup),
590 atomic_read(&net->n_reval),
591 atomic_read(&net->n_inval),
592 atomic_read(&net->n_relpg));
593
594 seq_printf(m, "dir-data: rdpg=%u\n",
595 atomic_read(&net->n_read_dir));
596
597 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
598 atomic_read(&net->n_dir_cr),
599 atomic_read(&net->n_dir_rm));
600
601 seq_printf(m, "file-rd : n=%u nb=%lu\n",
602 atomic_read(&net->n_fetches),
603 atomic_long_read(&net->n_fetch_bytes));
604 seq_printf(m, "file-wr : n=%u nb=%lu\n",
605 atomic_read(&net->n_stores),
606 atomic_long_read(&net->n_store_bytes));
607 return 0;
608}
609
610/*
611 * initialise /proc/fs/afs/<cell>/
612 */
613int afs_proc_cell_setup(struct afs_cell *cell)
614{
615 struct proc_dir_entry *dir;
616 struct afs_net *net = cell->net;
617
618 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
619
620 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
621 if (!dir)
622 goto error_dir;
623
624 if (!proc_create_net_data("vlservers", 0444, dir,
625 &afs_proc_cell_vlservers_ops,
626 sizeof(struct afs_vl_seq_net_private),
627 cell) ||
628 !proc_create_net_data("volumes", 0444, dir,
629 &afs_proc_cell_volumes_ops,
630 sizeof(struct seq_net_private),
631 cell))
632 goto error_tree;
633
634 _leave(" = 0");
635 return 0;
636
637error_tree:
638 remove_proc_subtree(cell->name, net->proc_afs);
639error_dir:
640 _leave(" = -ENOMEM");
641 return -ENOMEM;
642}
643
644/*
645 * remove /proc/fs/afs/<cell>/
646 */
647void afs_proc_cell_remove(struct afs_cell *cell)
648{
649 struct afs_net *net = cell->net;
650
651 _enter("");
652 remove_proc_subtree(cell->name, net->proc_afs);
653 _leave("");
654}
655
656/*
657 * initialise the /proc/fs/afs/ directory
658 */
659int afs_proc_init(struct afs_net *net)
660{
661 struct proc_dir_entry *p;
662
663 _enter("");
664
665 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
666 if (!p)
667 goto error_dir;
668
669 if (!proc_create_net_data_write("cells", 0644, p,
670 &afs_proc_cells_ops,
671 afs_proc_cells_write,
672 sizeof(struct seq_net_private),
673 NULL) ||
674 !proc_create_net_single_write("rootcell", 0644, p,
675 afs_proc_rootcell_show,
676 afs_proc_rootcell_write,
677 NULL) ||
678 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
679 sizeof(struct seq_net_private)) ||
680 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
681 !proc_create_net_data_write("sysname", 0644, p,
682 &afs_proc_sysname_ops,
683 afs_proc_sysname_write,
684 sizeof(struct seq_net_private),
685 NULL))
686 goto error_tree;
687
688 net->proc_afs = p;
689 _leave(" = 0");
690 return 0;
691
692error_tree:
693 proc_remove(p);
694error_dir:
695 _leave(" = -ENOMEM");
696 return -ENOMEM;
697}
698
699/*
700 * clean up the /proc/fs/afs/ directory
701 */
702void afs_proc_cleanup(struct afs_net *net)
703{
704 proc_remove(net->proc_afs);
705 net->proc_afs = NULL;
706}