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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/* /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}