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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 <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};
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 = kmalloc(size + 1, GFP_KERNEL);
234 if (!kbuf)
235 return -ENOMEM;
236
237 ret = -EFAULT;
238 if (copy_from_user(kbuf, buf, size) != 0)
239 goto done;
240 kbuf[size] = 0;
241
242 /* trim to first NL */
243 name = memchr(kbuf, '\n', size);
244 if (name)
245 *name = 0;
246
247 /* split into command, name and argslist */
248 name = strchr(kbuf, ' ');
249 if (!name)
250 goto inval;
251 do {
252 *name++ = 0;
253 } while(*name == ' ');
254 if (!*name)
255 goto inval;
256
257 args = strchr(name, ' ');
258 if (!args)
259 goto inval;
260 do {
261 *args++ = 0;
262 } while(*args == ' ');
263 if (!*args)
264 goto inval;
265
266 /* determine command to perform */
267 _debug("cmd=%s name=%s args=%s", kbuf, name, args);
268
269 if (strcmp(kbuf, "add") == 0) {
270 struct afs_cell *cell;
271
272 cell = afs_cell_create(name, strlen(name), args, false);
273 if (IS_ERR(cell)) {
274 ret = PTR_ERR(cell);
275 goto done;
276 }
277
278 afs_put_cell(cell);
279 printk("kAFS: Added new cell '%s'\n", name);
280 } else {
281 goto inval;
282 }
283
284 ret = size;
285
286done:
287 kfree(kbuf);
288 _leave(" = %d", ret);
289 return ret;
290
291inval:
292 ret = -EINVAL;
293 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
294 goto done;
295}
296
297static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
298 size_t size, loff_t *_pos)
299{
300 return 0;
301}
302
303/*
304 * handle writes to /proc/fs/afs/rootcell
305 * - to initialize rootcell: echo "cell.name:192.168.231.14"
306 */
307static ssize_t afs_proc_rootcell_write(struct file *file,
308 const char __user *buf,
309 size_t size, loff_t *_pos)
310{
311 char *kbuf, *s;
312 int ret;
313
314 /* start by dragging the command into memory */
315 if (size <= 1 || size >= PAGE_SIZE)
316 return -EINVAL;
317
318 ret = -ENOMEM;
319 kbuf = kmalloc(size + 1, GFP_KERNEL);
320 if (!kbuf)
321 goto nomem;
322
323 ret = -EFAULT;
324 if (copy_from_user(kbuf, buf, size) != 0)
325 goto infault;
326 kbuf[size] = 0;
327
328 /* trim to first NL */
329 s = memchr(kbuf, '\n', size);
330 if (s)
331 *s = 0;
332
333 /* determine command to perform */
334 _debug("rootcell=%s", kbuf);
335
336 ret = afs_cell_init(kbuf);
337 if (ret >= 0)
338 ret = size; /* consume everything, always */
339
340infault:
341 kfree(kbuf);
342nomem:
343 _leave(" = %d", ret);
344 return ret;
345}
346
347/*
348 * initialise /proc/fs/afs/<cell>/
349 */
350int afs_proc_cell_setup(struct afs_cell *cell)
351{
352 struct proc_dir_entry *dir;
353
354 _enter("%p{%s}", cell, cell->name);
355
356 dir = proc_mkdir(cell->name, proc_afs);
357 if (!dir)
358 goto error_dir;
359
360 if (!proc_create_data("servers", 0, dir,
361 &afs_proc_cell_servers_fops, cell) ||
362 !proc_create_data("vlservers", 0, dir,
363 &afs_proc_cell_vlservers_fops, cell) ||
364 !proc_create_data("volumes", 0, dir,
365 &afs_proc_cell_volumes_fops, cell))
366 goto error_tree;
367
368 _leave(" = 0");
369 return 0;
370
371error_tree:
372 remove_proc_subtree(cell->name, proc_afs);
373error_dir:
374 _leave(" = -ENOMEM");
375 return -ENOMEM;
376}
377
378/*
379 * remove /proc/fs/afs/<cell>/
380 */
381void afs_proc_cell_remove(struct afs_cell *cell)
382{
383 _enter("");
384
385 remove_proc_subtree(cell->name, proc_afs);
386
387 _leave("");
388}
389
390/*
391 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
392 */
393static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
394{
395 struct afs_cell *cell;
396 struct seq_file *m;
397 int ret;
398
399 cell = PDE_DATA(inode);
400 if (!cell)
401 return -ENOENT;
402
403 ret = seq_open(file, &afs_proc_cell_volumes_ops);
404 if (ret < 0)
405 return ret;
406
407 m = file->private_data;
408 m->private = cell;
409
410 return 0;
411}
412
413/*
414 * set up the iterator to start reading from the cells list and return the
415 * first item
416 */
417static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
418{
419 struct afs_cell *cell = m->private;
420
421 _enter("cell=%p pos=%Ld", cell, *_pos);
422
423 /* lock the list against modification */
424 down_read(&cell->vl_sem);
425 return seq_list_start_head(&cell->vl_list, *_pos);
426}
427
428/*
429 * move to next cell in cells list
430 */
431static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
432 loff_t *_pos)
433{
434 struct afs_cell *cell = p->private;
435
436 _enter("cell=%p pos=%Ld", cell, *_pos);
437 return seq_list_next(v, &cell->vl_list, _pos);
438}
439
440/*
441 * clean up after reading from the cells list
442 */
443static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
444{
445 struct afs_cell *cell = p->private;
446
447 up_read(&cell->vl_sem);
448}
449
450static const char afs_vlocation_states[][4] = {
451 [AFS_VL_NEW] = "New",
452 [AFS_VL_CREATING] = "Crt",
453 [AFS_VL_VALID] = "Val",
454 [AFS_VL_NO_VOLUME] = "NoV",
455 [AFS_VL_UPDATING] = "Upd",
456 [AFS_VL_VOLUME_DELETED] = "Del",
457 [AFS_VL_UNCERTAIN] = "Unc",
458};
459
460/*
461 * display a header line followed by a load of volume lines
462 */
463static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
464{
465 struct afs_cell *cell = m->private;
466 struct afs_vlocation *vlocation =
467 list_entry(v, struct afs_vlocation, link);
468
469 /* display header on line 1 */
470 if (v == &cell->vl_list) {
471 seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
472 return 0;
473 }
474
475 /* display one cell per line on subsequent lines */
476 seq_printf(m, "%3d %s %08x %08x %08x %s\n",
477 atomic_read(&vlocation->usage),
478 afs_vlocation_states[vlocation->state],
479 vlocation->vldb.vid[0],
480 vlocation->vldb.vid[1],
481 vlocation->vldb.vid[2],
482 vlocation->vldb.name);
483
484 return 0;
485}
486
487/*
488 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
489 * location server
490 */
491static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
492{
493 struct afs_cell *cell;
494 struct seq_file *m;
495 int ret;
496
497 cell = PDE_DATA(inode);
498 if (!cell)
499 return -ENOENT;
500
501 ret = seq_open(file, &afs_proc_cell_vlservers_ops);
502 if (ret<0)
503 return ret;
504
505 m = file->private_data;
506 m->private = cell;
507
508 return 0;
509}
510
511/*
512 * set up the iterator to start reading from the cells list and return the
513 * first item
514 */
515static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
516{
517 struct afs_cell *cell = m->private;
518 loff_t pos = *_pos;
519
520 _enter("cell=%p pos=%Ld", cell, *_pos);
521
522 /* lock the list against modification */
523 down_read(&cell->vl_sem);
524
525 /* allow for the header line */
526 if (!pos)
527 return (void *) 1;
528 pos--;
529
530 if (pos >= cell->vl_naddrs)
531 return NULL;
532
533 return &cell->vl_addrs[pos];
534}
535
536/*
537 * move to next cell in cells list
538 */
539static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
540 loff_t *_pos)
541{
542 struct afs_cell *cell = p->private;
543 loff_t pos;
544
545 _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
546
547 pos = *_pos;
548 (*_pos)++;
549 if (pos >= cell->vl_naddrs)
550 return NULL;
551
552 return &cell->vl_addrs[pos];
553}
554
555/*
556 * clean up after reading from the cells list
557 */
558static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
559{
560 struct afs_cell *cell = p->private;
561
562 up_read(&cell->vl_sem);
563}
564
565/*
566 * display a header line followed by a load of volume lines
567 */
568static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
569{
570 struct in_addr *addr = v;
571
572 /* display header on line 1 */
573 if (v == (struct in_addr *) 1) {
574 seq_puts(m, "ADDRESS\n");
575 return 0;
576 }
577
578 /* display one cell per line on subsequent lines */
579 seq_printf(m, "%pI4\n", &addr->s_addr);
580 return 0;
581}
582
583/*
584 * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
585 * servers
586 */
587static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
588{
589 struct afs_cell *cell;
590 struct seq_file *m;
591 int ret;
592
593 cell = PDE_DATA(inode);
594 if (!cell)
595 return -ENOENT;
596
597 ret = seq_open(file, &afs_proc_cell_servers_ops);
598 if (ret < 0)
599 return ret;
600
601 m = file->private_data;
602 m->private = cell;
603 return 0;
604}
605
606/*
607 * set up the iterator to start reading from the cells list and return the
608 * first item
609 */
610static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
611 __acquires(m->private->servers_lock)
612{
613 struct afs_cell *cell = m->private;
614
615 _enter("cell=%p pos=%Ld", cell, *_pos);
616
617 /* lock the list against modification */
618 read_lock(&cell->servers_lock);
619 return seq_list_start_head(&cell->servers, *_pos);
620}
621
622/*
623 * move to next cell in cells list
624 */
625static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
626 loff_t *_pos)
627{
628 struct afs_cell *cell = p->private;
629
630 _enter("cell=%p pos=%Ld", cell, *_pos);
631 return seq_list_next(v, &cell->servers, _pos);
632}
633
634/*
635 * clean up after reading from the cells list
636 */
637static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
638 __releases(p->private->servers_lock)
639{
640 struct afs_cell *cell = p->private;
641
642 read_unlock(&cell->servers_lock);
643}
644
645/*
646 * display a header line followed by a load of volume lines
647 */
648static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
649{
650 struct afs_cell *cell = m->private;
651 struct afs_server *server = list_entry(v, struct afs_server, link);
652 char ipaddr[20];
653
654 /* display header on line 1 */
655 if (v == &cell->servers) {
656 seq_puts(m, "USE ADDR STATE\n");
657 return 0;
658 }
659
660 /* display one cell per line on subsequent lines */
661 sprintf(ipaddr, "%pI4", &server->addr);
662 seq_printf(m, "%3d %-15.15s %5d\n",
663 atomic_read(&server->usage), ipaddr, server->fs_state);
664
665 return 0;
666}
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}