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
20 static struct proc_dir_entry *proc_afs;
21
22
23 static int afs_proc_cells_open(struct inode *inode, struct file *file);
24 static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
25 static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
26 static void afs_proc_cells_stop(struct seq_file *p, void *v);
27 static int afs_proc_cells_show(struct seq_file *m, void *v);
28 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
29 size_t size, loff_t *_pos);
30
31 static 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
38 static 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
46 static int afs_proc_rootcell_open(struct inode *inode, struct file *file);
47 static int afs_proc_rootcell_release(struct inode *inode, struct file *file);
48 static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
49 size_t size, loff_t *_pos);
50 static ssize_t afs_proc_rootcell_write(struct file *file,
51 const char __user *buf,
52 size_t size, loff_t *_pos);
53
54 static const struct file_operations afs_proc_rootcell_fops = {
55 .open = afs_proc_rootcell_open,
56 .read = afs_proc_rootcell_read,
57 .write = afs_proc_rootcell_write,
58 .llseek = no_llseek,
59 .release = afs_proc_rootcell_release
60 };
61
62 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
63 static int afs_proc_cell_volumes_release(struct inode *inode,
64 struct file *file);
65 static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
66 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
67 loff_t *pos);
68 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
69 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
70
71 static struct seq_operations afs_proc_cell_volumes_ops = {
72 .start = afs_proc_cell_volumes_start,
73 .next = afs_proc_cell_volumes_next,
74 .stop = afs_proc_cell_volumes_stop,
75 .show = afs_proc_cell_volumes_show,
76 };
77
78 static const struct file_operations afs_proc_cell_volumes_fops = {
79 .open = afs_proc_cell_volumes_open,
80 .read = seq_read,
81 .llseek = seq_lseek,
82 .release = afs_proc_cell_volumes_release,
83 };
84
85 static int afs_proc_cell_vlservers_open(struct inode *inode,
86 struct file *file);
87 static int afs_proc_cell_vlservers_release(struct inode *inode,
88 struct file *file);
89 static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
90 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
91 loff_t *pos);
92 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
93 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
94
95 static struct seq_operations afs_proc_cell_vlservers_ops = {
96 .start = afs_proc_cell_vlservers_start,
97 .next = afs_proc_cell_vlservers_next,
98 .stop = afs_proc_cell_vlservers_stop,
99 .show = afs_proc_cell_vlservers_show,
100 };
101
102 static const struct file_operations afs_proc_cell_vlservers_fops = {
103 .open = afs_proc_cell_vlservers_open,
104 .read = seq_read,
105 .llseek = seq_lseek,
106 .release = afs_proc_cell_vlservers_release,
107 };
108
109 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
110 static int afs_proc_cell_servers_release(struct inode *inode,
111 struct file *file);
112 static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
113 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
114 loff_t *pos);
115 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
116 static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
117
118 static struct seq_operations afs_proc_cell_servers_ops = {
119 .start = afs_proc_cell_servers_start,
120 .next = afs_proc_cell_servers_next,
121 .stop = afs_proc_cell_servers_stop,
122 .show = afs_proc_cell_servers_show,
123 };
124
125 static const struct file_operations afs_proc_cell_servers_fops = {
126 .open = afs_proc_cell_servers_open,
127 .read = seq_read,
128 .llseek = seq_lseek,
129 .release = afs_proc_cell_servers_release,
130 };
131
132 /*
133 * initialise the /proc/fs/afs/ directory
134 */
135 int afs_proc_init(void)
136 {
137 struct proc_dir_entry *p;
138
139 _enter("");
140
141 proc_afs = proc_mkdir("fs/afs", NULL);
142 if (!proc_afs)
143 goto error_dir;
144 proc_afs->owner = THIS_MODULE;
145
146 p = create_proc_entry("cells", 0, proc_afs);
147 if (!p)
148 goto error_cells;
149 p->proc_fops = &afs_proc_cells_fops;
150 p->owner = THIS_MODULE;
151
152 p = create_proc_entry("rootcell", 0, proc_afs);
153 if (!p)
154 goto error_rootcell;
155 p->proc_fops = &afs_proc_rootcell_fops;
156 p->owner = THIS_MODULE;
157
158 _leave(" = 0");
159 return 0;
160
161 error_rootcell:
162 remove_proc_entry("cells", proc_afs);
163 error_cells:
164 remove_proc_entry("fs/afs", NULL);
165 error_dir:
166 _leave(" = -ENOMEM");
167 return -ENOMEM;
168 }
169
170 /*
171 * clean up the /proc/fs/afs/ directory
172 */
173 void 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 */
183 static 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 */
202 static 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 */
212 static 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 */
220 static 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 */
228 static 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 */
248 static 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, args);
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
311 done:
312 kfree(kbuf);
313 _leave(" = %d", ret);
314 return ret;
315
316 inval:
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 */
325 static int afs_proc_rootcell_open(struct inode *inode, struct file *file)
326 {
327 return 0;
328 }
329
330 static int afs_proc_rootcell_release(struct inode *inode, struct file *file)
331 {
332 return 0;
333 }
334
335 static 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 */
345 static 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
378 infault:
379 kfree(kbuf);
380 nomem:
381 _leave(" = %d", ret);
382 return ret;
383 }
384
385 /*
386 * initialise /proc/fs/afs/<cell>/
387 */
388 int 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 = create_proc_entry("servers", 0, cell->proc_dir);
399 if (!p)
400 goto error_servers;
401 p->proc_fops = &afs_proc_cell_servers_fops;
402 p->owner = THIS_MODULE;
403 p->data = cell;
404
405 p = create_proc_entry("vlservers", 0, cell->proc_dir);
406 if (!p)
407 goto error_vlservers;
408 p->proc_fops = &afs_proc_cell_vlservers_fops;
409 p->owner = THIS_MODULE;
410 p->data = cell;
411
412 p = create_proc_entry("volumes", 0, cell->proc_dir);
413 if (!p)
414 goto error_volumes;
415 p->proc_fops = &afs_proc_cell_volumes_fops;
416 p->owner = THIS_MODULE;
417 p->data = cell;
418
419 _leave(" = 0");
420 return 0;
421
422 error_volumes:
423 remove_proc_entry("vlservers", cell->proc_dir);
424 error_vlservers:
425 remove_proc_entry("servers", cell->proc_dir);
426 error_servers:
427 remove_proc_entry(cell->name, proc_afs);
428 error_dir:
429 _leave(" = -ENOMEM");
430 return -ENOMEM;
431 }
432
433 /*
434 * remove /proc/fs/afs/<cell>/
435 */
436 void afs_proc_cell_remove(struct afs_cell *cell)
437 {
438 _enter("");
439
440 remove_proc_entry("volumes", cell->proc_dir);
441 remove_proc_entry("vlservers", cell->proc_dir);
442 remove_proc_entry("servers", cell->proc_dir);
443 remove_proc_entry(cell->name, proc_afs);
444
445 _leave("");
446 }
447
448 /*
449 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
450 */
451 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
452 {
453 struct afs_cell *cell;
454 struct seq_file *m;
455 int ret;
456
457 cell = PDE(inode)->data;
458 if (!cell)
459 return -ENOENT;
460
461 ret = seq_open(file, &afs_proc_cell_volumes_ops);
462 if (ret < 0)
463 return ret;
464
465 m = file->private_data;
466 m->private = cell;
467
468 return 0;
469 }
470
471 /*
472 * close the file and release the ref to the cell
473 */
474 static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file)
475 {
476 return seq_release(inode, file);
477 }
478
479 /*
480 * set up the iterator to start reading from the cells list and return the
481 * first item
482 */
483 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
484 {
485 struct afs_cell *cell = m->private;
486
487 _enter("cell=%p pos=%Ld", cell, *_pos);
488
489 /* lock the list against modification */
490 down_read(&cell->vl_sem);
491 return seq_list_start_head(&cell->vl_list, *_pos);
492 }
493
494 /*
495 * move to next cell in cells list
496 */
497 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
498 loff_t *_pos)
499 {
500 struct afs_cell *cell = p->private;
501
502 _enter("cell=%p pos=%Ld", cell, *_pos);
503 return seq_list_next(v, &cell->vl_list, _pos);
504 }
505
506 /*
507 * clean up after reading from the cells list
508 */
509 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
510 {
511 struct afs_cell *cell = p->private;
512
513 up_read(&cell->vl_sem);
514 }
515
516 static const char afs_vlocation_states[][4] = {
517 [AFS_VL_NEW] = "New",
518 [AFS_VL_CREATING] = "Crt",
519 [AFS_VL_VALID] = "Val",
520 [AFS_VL_NO_VOLUME] = "NoV",
521 [AFS_VL_UPDATING] = "Upd",
522 [AFS_VL_VOLUME_DELETED] = "Del",
523 [AFS_VL_UNCERTAIN] = "Unc",
524 };
525
526 /*
527 * display a header line followed by a load of volume lines
528 */
529 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
530 {
531 struct afs_cell *cell = m->private;
532 struct afs_vlocation *vlocation =
533 list_entry(v, struct afs_vlocation, link);
534
535 /* display header on line 1 */
536 if (v == &cell->vl_list) {
537 seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
538 return 0;
539 }
540
541 /* display one cell per line on subsequent lines */
542 seq_printf(m, "%3d %s %08x %08x %08x %s\n",
543 atomic_read(&vlocation->usage),
544 afs_vlocation_states[vlocation->state],
545 vlocation->vldb.vid[0],
546 vlocation->vldb.vid[1],
547 vlocation->vldb.vid[2],
548 vlocation->vldb.name);
549
550 return 0;
551 }
552
553 /*
554 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
555 * location server
556 */
557 static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
558 {
559 struct afs_cell *cell;
560 struct seq_file *m;
561 int ret;
562
563 cell = PDE(inode)->data;
564 if (!cell)
565 return -ENOENT;
566
567 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
568 if (ret<0)
569 return ret;
570
571 m = file->private_data;
572 m->private = cell;
573
574 return 0;
575 }
576
577 /*
578 * close the file and release the ref to the cell
579 */
580 static int afs_proc_cell_vlservers_release(struct inode *inode,
581 struct file *file)
582 {
583 return seq_release(inode, file);
584 }
585
586 /*
587 * set up the iterator to start reading from the cells list and return the
588 * first item
589 */
590 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
591 {
592 struct afs_cell *cell = m->private;
593 loff_t pos = *_pos;
594
595 _enter("cell=%p pos=%Ld", cell, *_pos);
596
597 /* lock the list against modification */
598 down_read(&cell->vl_sem);
599
600 /* allow for the header line */
601 if (!pos)
602 return (void *) 1;
603 pos--;
604
605 if (pos >= cell->vl_naddrs)
606 return NULL;
607
608 return &cell->vl_addrs[pos];
609 }
610
611 /*
612 * move to next cell in cells list
613 */
614 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
615 loff_t *_pos)
616 {
617 struct afs_cell *cell = p->private;
618 loff_t pos;
619
620 _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
621
622 pos = *_pos;
623 (*_pos)++;
624 if (pos >= cell->vl_naddrs)
625 return NULL;
626
627 return &cell->vl_addrs[pos];
628 }
629
630 /*
631 * clean up after reading from the cells list
632 */
633 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
634 {
635 struct afs_cell *cell = p->private;
636
637 up_read(&cell->vl_sem);
638 }
639
640 /*
641 * display a header line followed by a load of volume lines
642 */
643 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
644 {
645 struct in_addr *addr = v;
646
647 /* display header on line 1 */
648 if (v == (struct in_addr *) 1) {
649 seq_puts(m, "ADDRESS\n");
650 return 0;
651 }
652
653 /* display one cell per line on subsequent lines */
654 seq_printf(m, "%u.%u.%u.%u\n", NIPQUAD(addr->s_addr));
655 return 0;
656 }
657
658 /*
659 * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
660 * servers
661 */
662 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
663 {
664 struct afs_cell *cell;
665 struct seq_file *m;
666 int ret;
667
668 cell = PDE(inode)->data;
669 if (!cell)
670 return -ENOENT;
671
672 ret = seq_open(file, &afs_proc_cell_servers_ops);
673 if (ret < 0)
674 return ret;
675
676 m = file->private_data;
677 m->private = cell;
678 return 0;
679 }
680
681 /*
682 * close the file and release the ref to the cell
683 */
684 static int afs_proc_cell_servers_release(struct inode *inode,
685 struct file *file)
686 {
687 return seq_release(inode, file);
688 }
689
690 /*
691 * set up the iterator to start reading from the cells list and return the
692 * first item
693 */
694 static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
695 __acquires(m->private->servers_lock)
696 {
697 struct afs_cell *cell = m->private;
698
699 _enter("cell=%p pos=%Ld", cell, *_pos);
700
701 /* lock the list against modification */
702 read_lock(&cell->servers_lock);
703 return seq_list_start_head(&cell->servers, *_pos);
704 }
705
706 /*
707 * move to next cell in cells list
708 */
709 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
710 loff_t *_pos)
711 {
712 struct afs_cell *cell = p->private;
713
714 _enter("cell=%p pos=%Ld", cell, *_pos);
715 return seq_list_next(v, &cell->servers, _pos);
716 }
717
718 /*
719 * clean up after reading from the cells list
720 */
721 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
722 __releases(p->private->servers_lock)
723 {
724 struct afs_cell *cell = p->private;
725
726 read_unlock(&cell->servers_lock);
727 }
728
729 /*
730 * display a header line followed by a load of volume lines
731 */
732 static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
733 {
734 struct afs_cell *cell = m->private;
735 struct afs_server *server = list_entry(v, struct afs_server, link);
736 char ipaddr[20];
737
738 /* display header on line 1 */
739 if (v == &cell->servers) {
740 seq_puts(m, "USE ADDR STATE\n");
741 return 0;
742 }
743
744 /* display one cell per line on subsequent lines */
745 sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(server->addr));
746 seq_printf(m, "%3d %-15.15s %5d\n",
747 atomic_read(&server->usage), ipaddr, server->fs_state);
748
749 return 0;
750 }
751
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