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Commit | Line | Data |
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ec26815a | 1 | /* /proc interface for AFS |
1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/slab.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/seq_file.h> | |
1da177e4 LT |
16 | #include <asm/uaccess.h> |
17 | #include "internal.h" | |
18 | ||
19 | static struct proc_dir_entry *proc_afs; | |
20 | ||
21 | ||
22 | static int afs_proc_cells_open(struct inode *inode, struct file *file); | |
23 | static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos); | |
24 | static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos); | |
25 | static void afs_proc_cells_stop(struct seq_file *p, void *v); | |
26 | static int afs_proc_cells_show(struct seq_file *m, void *v); | |
27 | static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, | |
28 | size_t size, loff_t *_pos); | |
29 | ||
30 | static struct seq_operations afs_proc_cells_ops = { | |
31 | .start = afs_proc_cells_start, | |
32 | .next = afs_proc_cells_next, | |
33 | .stop = afs_proc_cells_stop, | |
34 | .show = afs_proc_cells_show, | |
35 | }; | |
36 | ||
4b6f5d20 | 37 | static const struct file_operations afs_proc_cells_fops = { |
1da177e4 LT |
38 | .open = afs_proc_cells_open, |
39 | .read = seq_read, | |
40 | .write = afs_proc_cells_write, | |
41 | .llseek = seq_lseek, | |
42 | .release = seq_release, | |
43 | }; | |
44 | ||
45 | static int afs_proc_rootcell_open(struct inode *inode, struct file *file); | |
46 | static int afs_proc_rootcell_release(struct inode *inode, struct file *file); | |
47 | static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, | |
48 | size_t size, loff_t *_pos); | |
49 | static ssize_t afs_proc_rootcell_write(struct file *file, | |
50 | const char __user *buf, | |
51 | size_t size, loff_t *_pos); | |
52 | ||
4b6f5d20 | 53 | static const struct file_operations afs_proc_rootcell_fops = { |
1da177e4 LT |
54 | .open = afs_proc_rootcell_open, |
55 | .read = afs_proc_rootcell_read, | |
56 | .write = afs_proc_rootcell_write, | |
57 | .llseek = no_llseek, | |
58 | .release = afs_proc_rootcell_release | |
59 | }; | |
60 | ||
61 | static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file); | |
62 | static int afs_proc_cell_volumes_release(struct inode *inode, | |
63 | struct file *file); | |
64 | static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos); | |
65 | static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, | |
66 | loff_t *pos); | |
67 | static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v); | |
68 | static int afs_proc_cell_volumes_show(struct seq_file *m, void *v); | |
69 | ||
70 | static struct seq_operations afs_proc_cell_volumes_ops = { | |
71 | .start = afs_proc_cell_volumes_start, | |
72 | .next = afs_proc_cell_volumes_next, | |
73 | .stop = afs_proc_cell_volumes_stop, | |
74 | .show = afs_proc_cell_volumes_show, | |
75 | }; | |
76 | ||
4b6f5d20 | 77 | static const struct file_operations afs_proc_cell_volumes_fops = { |
1da177e4 LT |
78 | .open = afs_proc_cell_volumes_open, |
79 | .read = seq_read, | |
80 | .llseek = seq_lseek, | |
81 | .release = afs_proc_cell_volumes_release, | |
82 | }; | |
83 | ||
84 | static int afs_proc_cell_vlservers_open(struct inode *inode, | |
85 | struct file *file); | |
86 | static int afs_proc_cell_vlservers_release(struct inode *inode, | |
87 | struct file *file); | |
88 | static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos); | |
89 | static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, | |
90 | loff_t *pos); | |
91 | static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v); | |
92 | static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v); | |
93 | ||
94 | static struct seq_operations afs_proc_cell_vlservers_ops = { | |
95 | .start = afs_proc_cell_vlservers_start, | |
96 | .next = afs_proc_cell_vlservers_next, | |
97 | .stop = afs_proc_cell_vlservers_stop, | |
98 | .show = afs_proc_cell_vlservers_show, | |
99 | }; | |
100 | ||
4b6f5d20 | 101 | static const struct file_operations afs_proc_cell_vlservers_fops = { |
1da177e4 LT |
102 | .open = afs_proc_cell_vlservers_open, |
103 | .read = seq_read, | |
104 | .llseek = seq_lseek, | |
105 | .release = afs_proc_cell_vlservers_release, | |
106 | }; | |
107 | ||
108 | static int afs_proc_cell_servers_open(struct inode *inode, struct file *file); | |
109 | static int afs_proc_cell_servers_release(struct inode *inode, | |
110 | struct file *file); | |
111 | static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos); | |
112 | static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, | |
113 | loff_t *pos); | |
114 | static void afs_proc_cell_servers_stop(struct seq_file *p, void *v); | |
115 | static int afs_proc_cell_servers_show(struct seq_file *m, void *v); | |
116 | ||
117 | static struct seq_operations afs_proc_cell_servers_ops = { | |
118 | .start = afs_proc_cell_servers_start, | |
119 | .next = afs_proc_cell_servers_next, | |
120 | .stop = afs_proc_cell_servers_stop, | |
121 | .show = afs_proc_cell_servers_show, | |
122 | }; | |
123 | ||
4b6f5d20 | 124 | static const struct file_operations afs_proc_cell_servers_fops = { |
1da177e4 LT |
125 | .open = afs_proc_cell_servers_open, |
126 | .read = seq_read, | |
127 | .llseek = seq_lseek, | |
128 | .release = afs_proc_cell_servers_release, | |
129 | }; | |
130 | ||
1da177e4 LT |
131 | /* |
132 | * initialise the /proc/fs/afs/ directory | |
133 | */ | |
134 | int afs_proc_init(void) | |
135 | { | |
136 | struct proc_dir_entry *p; | |
137 | ||
138 | _enter(""); | |
139 | ||
140 | proc_afs = proc_mkdir("fs/afs", NULL); | |
141 | if (!proc_afs) | |
ec26815a | 142 | goto error_dir; |
1da177e4 LT |
143 | proc_afs->owner = THIS_MODULE; |
144 | ||
145 | p = create_proc_entry("cells", 0, proc_afs); | |
146 | if (!p) | |
ec26815a | 147 | goto error_cells; |
1da177e4 LT |
148 | p->proc_fops = &afs_proc_cells_fops; |
149 | p->owner = THIS_MODULE; | |
150 | ||
151 | p = create_proc_entry("rootcell", 0, proc_afs); | |
152 | if (!p) | |
ec26815a | 153 | goto error_rootcell; |
1da177e4 LT |
154 | p->proc_fops = &afs_proc_rootcell_fops; |
155 | p->owner = THIS_MODULE; | |
156 | ||
157 | _leave(" = 0"); | |
158 | return 0; | |
159 | ||
ec26815a | 160 | error_rootcell: |
1da177e4 | 161 | remove_proc_entry("cells", proc_afs); |
ec26815a | 162 | error_cells: |
1da177e4 | 163 | remove_proc_entry("fs/afs", NULL); |
ec26815a | 164 | error_dir: |
1da177e4 LT |
165 | _leave(" = -ENOMEM"); |
166 | return -ENOMEM; | |
ec26815a | 167 | } |
1da177e4 | 168 | |
1da177e4 LT |
169 | /* |
170 | * clean up the /proc/fs/afs/ directory | |
171 | */ | |
172 | void afs_proc_cleanup(void) | |
173 | { | |
ec26815a | 174 | remove_proc_entry("rootcell", proc_afs); |
1da177e4 | 175 | remove_proc_entry("cells", proc_afs); |
1da177e4 | 176 | remove_proc_entry("fs/afs", NULL); |
ec26815a | 177 | } |
1da177e4 | 178 | |
1da177e4 LT |
179 | /* |
180 | * open "/proc/fs/afs/cells" which provides a summary of extant cells | |
181 | */ | |
182 | static int afs_proc_cells_open(struct inode *inode, struct file *file) | |
183 | { | |
184 | struct seq_file *m; | |
185 | int ret; | |
186 | ||
187 | ret = seq_open(file, &afs_proc_cells_ops); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | m = file->private_data; | |
192 | m->private = PDE(inode)->data; | |
193 | ||
194 | return 0; | |
ec26815a | 195 | } |
1da177e4 | 196 | |
1da177e4 LT |
197 | /* |
198 | * set up the iterator to start reading from the cells list and return the | |
199 | * first item | |
200 | */ | |
201 | static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) | |
202 | { | |
203 | struct list_head *_p; | |
204 | loff_t pos = *_pos; | |
205 | ||
206 | /* lock the list against modification */ | |
207 | down_read(&afs_proc_cells_sem); | |
208 | ||
209 | /* allow for the header line */ | |
210 | if (!pos) | |
211 | return (void *) 1; | |
212 | pos--; | |
213 | ||
214 | /* find the n'th element in the list */ | |
215 | list_for_each(_p, &afs_proc_cells) | |
216 | if (!pos--) | |
217 | break; | |
218 | ||
219 | return _p != &afs_proc_cells ? _p : NULL; | |
ec26815a | 220 | } |
1da177e4 | 221 | |
1da177e4 LT |
222 | /* |
223 | * move to next cell in cells list | |
224 | */ | |
225 | static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos) | |
226 | { | |
227 | struct list_head *_p; | |
228 | ||
229 | (*pos)++; | |
230 | ||
231 | _p = v; | |
232 | _p = v == (void *) 1 ? afs_proc_cells.next : _p->next; | |
233 | ||
234 | return _p != &afs_proc_cells ? _p : NULL; | |
ec26815a | 235 | } |
1da177e4 | 236 | |
1da177e4 LT |
237 | /* |
238 | * clean up after reading from the cells list | |
239 | */ | |
240 | static void afs_proc_cells_stop(struct seq_file *p, void *v) | |
241 | { | |
242 | up_read(&afs_proc_cells_sem); | |
ec26815a | 243 | } |
1da177e4 | 244 | |
1da177e4 LT |
245 | /* |
246 | * display a header line followed by a load of cell lines | |
247 | */ | |
248 | static int afs_proc_cells_show(struct seq_file *m, void *v) | |
249 | { | |
250 | struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link); | |
251 | ||
1da177e4 | 252 | if (v == (void *) 1) { |
ec26815a | 253 | /* display header on line 1 */ |
1da177e4 LT |
254 | seq_puts(m, "USE NAME\n"); |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* display one cell per line on subsequent lines */ | |
ec26815a DH |
259 | seq_printf(m, "%3d %s\n", |
260 | atomic_read(&cell->usage), cell->name); | |
1da177e4 | 261 | return 0; |
ec26815a | 262 | } |
1da177e4 | 263 | |
1da177e4 LT |
264 | /* |
265 | * handle writes to /proc/fs/afs/cells | |
266 | * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]" | |
267 | */ | |
268 | static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf, | |
269 | size_t size, loff_t *_pos) | |
270 | { | |
271 | char *kbuf, *name, *args; | |
272 | int ret; | |
273 | ||
274 | /* start by dragging the command into memory */ | |
275 | if (size <= 1 || size >= PAGE_SIZE) | |
276 | return -EINVAL; | |
277 | ||
278 | kbuf = kmalloc(size + 1, GFP_KERNEL); | |
279 | if (!kbuf) | |
280 | return -ENOMEM; | |
281 | ||
282 | ret = -EFAULT; | |
283 | if (copy_from_user(kbuf, buf, size) != 0) | |
284 | goto done; | |
285 | kbuf[size] = 0; | |
286 | ||
287 | /* trim to first NL */ | |
288 | name = memchr(kbuf, '\n', size); | |
289 | if (name) | |
290 | *name = 0; | |
291 | ||
292 | /* split into command, name and argslist */ | |
293 | name = strchr(kbuf, ' '); | |
294 | if (!name) | |
295 | goto inval; | |
296 | do { | |
297 | *name++ = 0; | |
298 | } while(*name == ' '); | |
299 | if (!*name) | |
300 | goto inval; | |
301 | ||
302 | args = strchr(name, ' '); | |
303 | if (!args) | |
304 | goto inval; | |
305 | do { | |
306 | *args++ = 0; | |
307 | } while(*args == ' '); | |
308 | if (!*args) | |
309 | goto inval; | |
310 | ||
311 | /* determine command to perform */ | |
312 | _debug("cmd=%s name=%s args=%s", kbuf, name, args); | |
313 | ||
314 | if (strcmp(kbuf, "add") == 0) { | |
315 | struct afs_cell *cell; | |
08e0e7c8 DH |
316 | |
317 | cell = afs_cell_create(name, args); | |
318 | if (IS_ERR(cell)) { | |
319 | ret = PTR_ERR(cell); | |
1da177e4 | 320 | goto done; |
08e0e7c8 | 321 | } |
1da177e4 | 322 | |
08e0e7c8 | 323 | afs_put_cell(cell); |
1da177e4 | 324 | printk("kAFS: Added new cell '%s'\n", name); |
ec26815a | 325 | } else { |
1da177e4 LT |
326 | goto inval; |
327 | } | |
328 | ||
329 | ret = size; | |
330 | ||
ec26815a | 331 | done: |
1da177e4 LT |
332 | kfree(kbuf); |
333 | _leave(" = %d", ret); | |
334 | return ret; | |
335 | ||
ec26815a | 336 | inval: |
1da177e4 LT |
337 | ret = -EINVAL; |
338 | printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); | |
339 | goto done; | |
ec26815a | 340 | } |
1da177e4 | 341 | |
1da177e4 LT |
342 | /* |
343 | * Stubs for /proc/fs/afs/rootcell | |
344 | */ | |
345 | static int afs_proc_rootcell_open(struct inode *inode, struct file *file) | |
346 | { | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static int afs_proc_rootcell_release(struct inode *inode, struct file *file) | |
351 | { | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf, | |
356 | size_t size, loff_t *_pos) | |
357 | { | |
358 | return 0; | |
359 | } | |
360 | ||
1da177e4 LT |
361 | /* |
362 | * handle writes to /proc/fs/afs/rootcell | |
363 | * - to initialize rootcell: echo "cell.name:192.168.231.14" | |
364 | */ | |
365 | static ssize_t afs_proc_rootcell_write(struct file *file, | |
366 | const char __user *buf, | |
367 | size_t size, loff_t *_pos) | |
368 | { | |
369 | char *kbuf, *s; | |
370 | int ret; | |
371 | ||
372 | /* start by dragging the command into memory */ | |
373 | if (size <= 1 || size >= PAGE_SIZE) | |
374 | return -EINVAL; | |
375 | ||
376 | ret = -ENOMEM; | |
377 | kbuf = kmalloc(size + 1, GFP_KERNEL); | |
378 | if (!kbuf) | |
379 | goto nomem; | |
380 | ||
381 | ret = -EFAULT; | |
382 | if (copy_from_user(kbuf, buf, size) != 0) | |
383 | goto infault; | |
384 | kbuf[size] = 0; | |
385 | ||
386 | /* trim to first NL */ | |
387 | s = memchr(kbuf, '\n', size); | |
388 | if (s) | |
389 | *s = 0; | |
390 | ||
391 | /* determine command to perform */ | |
392 | _debug("rootcell=%s", kbuf); | |
393 | ||
394 | ret = afs_cell_init(kbuf); | |
395 | if (ret >= 0) | |
396 | ret = size; /* consume everything, always */ | |
397 | ||
ec26815a | 398 | infault: |
1da177e4 | 399 | kfree(kbuf); |
ec26815a | 400 | nomem: |
1da177e4 LT |
401 | _leave(" = %d", ret); |
402 | return ret; | |
ec26815a | 403 | } |
1da177e4 | 404 | |
1da177e4 LT |
405 | /* |
406 | * initialise /proc/fs/afs/<cell>/ | |
407 | */ | |
408 | int afs_proc_cell_setup(struct afs_cell *cell) | |
409 | { | |
410 | struct proc_dir_entry *p; | |
411 | ||
412 | _enter("%p{%s}", cell, cell->name); | |
413 | ||
414 | cell->proc_dir = proc_mkdir(cell->name, proc_afs); | |
415 | if (!cell->proc_dir) | |
ec26815a | 416 | goto error_dir; |
1da177e4 LT |
417 | |
418 | p = create_proc_entry("servers", 0, cell->proc_dir); | |
419 | if (!p) | |
ec26815a | 420 | goto error_servers; |
1da177e4 LT |
421 | p->proc_fops = &afs_proc_cell_servers_fops; |
422 | p->owner = THIS_MODULE; | |
423 | p->data = cell; | |
424 | ||
425 | p = create_proc_entry("vlservers", 0, cell->proc_dir); | |
426 | if (!p) | |
ec26815a | 427 | goto error_vlservers; |
1da177e4 LT |
428 | p->proc_fops = &afs_proc_cell_vlservers_fops; |
429 | p->owner = THIS_MODULE; | |
430 | p->data = cell; | |
431 | ||
432 | p = create_proc_entry("volumes", 0, cell->proc_dir); | |
433 | if (!p) | |
ec26815a | 434 | goto error_volumes; |
1da177e4 LT |
435 | p->proc_fops = &afs_proc_cell_volumes_fops; |
436 | p->owner = THIS_MODULE; | |
437 | p->data = cell; | |
438 | ||
439 | _leave(" = 0"); | |
440 | return 0; | |
441 | ||
ec26815a | 442 | error_volumes: |
1da177e4 | 443 | remove_proc_entry("vlservers", cell->proc_dir); |
ec26815a | 444 | error_vlservers: |
1da177e4 | 445 | remove_proc_entry("servers", cell->proc_dir); |
ec26815a | 446 | error_servers: |
1da177e4 | 447 | remove_proc_entry(cell->name, proc_afs); |
ec26815a | 448 | error_dir: |
1da177e4 LT |
449 | _leave(" = -ENOMEM"); |
450 | return -ENOMEM; | |
ec26815a | 451 | } |
1da177e4 | 452 | |
1da177e4 LT |
453 | /* |
454 | * remove /proc/fs/afs/<cell>/ | |
455 | */ | |
456 | void afs_proc_cell_remove(struct afs_cell *cell) | |
457 | { | |
458 | _enter(""); | |
459 | ||
460 | remove_proc_entry("volumes", cell->proc_dir); | |
461 | remove_proc_entry("vlservers", cell->proc_dir); | |
462 | remove_proc_entry("servers", cell->proc_dir); | |
463 | remove_proc_entry(cell->name, proc_afs); | |
464 | ||
465 | _leave(""); | |
ec26815a | 466 | } |
1da177e4 | 467 | |
1da177e4 LT |
468 | /* |
469 | * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells | |
470 | */ | |
471 | static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file) | |
472 | { | |
473 | struct afs_cell *cell; | |
474 | struct seq_file *m; | |
475 | int ret; | |
476 | ||
08e0e7c8 | 477 | cell = PDE(inode)->data; |
1da177e4 LT |
478 | if (!cell) |
479 | return -ENOENT; | |
480 | ||
481 | ret = seq_open(file, &afs_proc_cell_volumes_ops); | |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | m = file->private_data; | |
486 | m->private = cell; | |
487 | ||
488 | return 0; | |
ec26815a | 489 | } |
1da177e4 | 490 | |
1da177e4 LT |
491 | /* |
492 | * close the file and release the ref to the cell | |
493 | */ | |
494 | static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file) | |
495 | { | |
08e0e7c8 | 496 | return seq_release(inode, file); |
ec26815a | 497 | } |
1da177e4 | 498 | |
1da177e4 LT |
499 | /* |
500 | * set up the iterator to start reading from the cells list and return the | |
501 | * first item | |
502 | */ | |
503 | static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) | |
504 | { | |
505 | struct list_head *_p; | |
506 | struct afs_cell *cell = m->private; | |
507 | loff_t pos = *_pos; | |
508 | ||
509 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
510 | ||
511 | /* lock the list against modification */ | |
512 | down_read(&cell->vl_sem); | |
513 | ||
514 | /* allow for the header line */ | |
515 | if (!pos) | |
516 | return (void *) 1; | |
517 | pos--; | |
518 | ||
519 | /* find the n'th element in the list */ | |
520 | list_for_each(_p, &cell->vl_list) | |
521 | if (!pos--) | |
522 | break; | |
523 | ||
524 | return _p != &cell->vl_list ? _p : NULL; | |
ec26815a | 525 | } |
1da177e4 | 526 | |
1da177e4 LT |
527 | /* |
528 | * move to next cell in cells list | |
529 | */ | |
530 | static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, | |
531 | loff_t *_pos) | |
532 | { | |
533 | struct list_head *_p; | |
534 | struct afs_cell *cell = p->private; | |
535 | ||
536 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
537 | ||
538 | (*_pos)++; | |
539 | ||
540 | _p = v; | |
ec26815a | 541 | _p = (v == (void *) 1) ? cell->vl_list.next : _p->next; |
1da177e4 | 542 | |
ec26815a DH |
543 | return (_p != &cell->vl_list) ? _p : NULL; |
544 | } | |
1da177e4 | 545 | |
1da177e4 LT |
546 | /* |
547 | * clean up after reading from the cells list | |
548 | */ | |
549 | static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v) | |
550 | { | |
551 | struct afs_cell *cell = p->private; | |
552 | ||
553 | up_read(&cell->vl_sem); | |
ec26815a | 554 | } |
1da177e4 | 555 | |
08e0e7c8 DH |
556 | const char afs_vlocation_states[][4] = { |
557 | [AFS_VL_NEW] = "New", | |
558 | [AFS_VL_CREATING] = "Crt", | |
559 | [AFS_VL_VALID] = "Val", | |
560 | [AFS_VL_NO_VOLUME] = "NoV", | |
561 | [AFS_VL_UPDATING] = "Upd", | |
562 | [AFS_VL_VOLUME_DELETED] = "Del", | |
563 | [AFS_VL_UNCERTAIN] = "Unc", | |
564 | }; | |
565 | ||
1da177e4 LT |
566 | /* |
567 | * display a header line followed by a load of volume lines | |
568 | */ | |
569 | static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) | |
570 | { | |
571 | struct afs_vlocation *vlocation = | |
572 | list_entry(v, struct afs_vlocation, link); | |
573 | ||
574 | /* display header on line 1 */ | |
575 | if (v == (void *) 1) { | |
08e0e7c8 | 576 | seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n"); |
1da177e4 LT |
577 | return 0; |
578 | } | |
579 | ||
580 | /* display one cell per line on subsequent lines */ | |
08e0e7c8 | 581 | seq_printf(m, "%3d %s %08x %08x %08x %s\n", |
1da177e4 | 582 | atomic_read(&vlocation->usage), |
08e0e7c8 | 583 | afs_vlocation_states[vlocation->state], |
1da177e4 LT |
584 | vlocation->vldb.vid[0], |
585 | vlocation->vldb.vid[1], | |
586 | vlocation->vldb.vid[2], | |
ec26815a | 587 | vlocation->vldb.name); |
1da177e4 LT |
588 | |
589 | return 0; | |
ec26815a | 590 | } |
1da177e4 | 591 | |
1da177e4 LT |
592 | /* |
593 | * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume | |
594 | * location server | |
595 | */ | |
596 | static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file) | |
597 | { | |
598 | struct afs_cell *cell; | |
599 | struct seq_file *m; | |
600 | int ret; | |
601 | ||
08e0e7c8 | 602 | cell = PDE(inode)->data; |
1da177e4 LT |
603 | if (!cell) |
604 | return -ENOENT; | |
605 | ||
08e0e7c8 | 606 | ret = seq_open(file, &afs_proc_cell_vlservers_ops); |
1da177e4 LT |
607 | if (ret<0) |
608 | return ret; | |
609 | ||
610 | m = file->private_data; | |
611 | m->private = cell; | |
612 | ||
613 | return 0; | |
ec26815a | 614 | } |
1da177e4 | 615 | |
1da177e4 LT |
616 | /* |
617 | * close the file and release the ref to the cell | |
618 | */ | |
619 | static int afs_proc_cell_vlservers_release(struct inode *inode, | |
620 | struct file *file) | |
621 | { | |
08e0e7c8 | 622 | return seq_release(inode, file); |
ec26815a | 623 | } |
1da177e4 | 624 | |
1da177e4 LT |
625 | /* |
626 | * set up the iterator to start reading from the cells list and return the | |
627 | * first item | |
628 | */ | |
629 | static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) | |
630 | { | |
631 | struct afs_cell *cell = m->private; | |
632 | loff_t pos = *_pos; | |
633 | ||
634 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
635 | ||
636 | /* lock the list against modification */ | |
637 | down_read(&cell->vl_sem); | |
638 | ||
639 | /* allow for the header line */ | |
640 | if (!pos) | |
641 | return (void *) 1; | |
642 | pos--; | |
643 | ||
644 | if (pos >= cell->vl_naddrs) | |
645 | return NULL; | |
646 | ||
647 | return &cell->vl_addrs[pos]; | |
ec26815a | 648 | } |
1da177e4 | 649 | |
1da177e4 LT |
650 | /* |
651 | * move to next cell in cells list | |
652 | */ | |
653 | static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v, | |
654 | loff_t *_pos) | |
655 | { | |
656 | struct afs_cell *cell = p->private; | |
657 | loff_t pos; | |
658 | ||
659 | _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos); | |
660 | ||
661 | pos = *_pos; | |
662 | (*_pos)++; | |
663 | if (pos >= cell->vl_naddrs) | |
664 | return NULL; | |
665 | ||
666 | return &cell->vl_addrs[pos]; | |
ec26815a | 667 | } |
1da177e4 | 668 | |
1da177e4 LT |
669 | /* |
670 | * clean up after reading from the cells list | |
671 | */ | |
672 | static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v) | |
673 | { | |
674 | struct afs_cell *cell = p->private; | |
675 | ||
676 | up_read(&cell->vl_sem); | |
ec26815a | 677 | } |
1da177e4 | 678 | |
1da177e4 LT |
679 | /* |
680 | * display a header line followed by a load of volume lines | |
681 | */ | |
682 | static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) | |
683 | { | |
684 | struct in_addr *addr = v; | |
685 | ||
686 | /* display header on line 1 */ | |
687 | if (v == (struct in_addr *) 1) { | |
688 | seq_puts(m, "ADDRESS\n"); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | /* display one cell per line on subsequent lines */ | |
693 | seq_printf(m, "%u.%u.%u.%u\n", NIPQUAD(addr->s_addr)); | |
1da177e4 | 694 | return 0; |
ec26815a | 695 | } |
1da177e4 | 696 | |
1da177e4 LT |
697 | /* |
698 | * open "/proc/fs/afs/<cell>/servers" which provides a summary of active | |
699 | * servers | |
700 | */ | |
701 | static int afs_proc_cell_servers_open(struct inode *inode, struct file *file) | |
702 | { | |
703 | struct afs_cell *cell; | |
704 | struct seq_file *m; | |
705 | int ret; | |
706 | ||
08e0e7c8 | 707 | cell = PDE(inode)->data; |
1da177e4 LT |
708 | if (!cell) |
709 | return -ENOENT; | |
710 | ||
711 | ret = seq_open(file, &afs_proc_cell_servers_ops); | |
712 | if (ret < 0) | |
713 | return ret; | |
714 | ||
715 | m = file->private_data; | |
716 | m->private = cell; | |
1da177e4 | 717 | return 0; |
ec26815a | 718 | } |
1da177e4 | 719 | |
1da177e4 LT |
720 | /* |
721 | * close the file and release the ref to the cell | |
722 | */ | |
723 | static int afs_proc_cell_servers_release(struct inode *inode, | |
724 | struct file *file) | |
725 | { | |
08e0e7c8 | 726 | return seq_release(inode, file); |
ec26815a | 727 | } |
1da177e4 | 728 | |
1da177e4 LT |
729 | /* |
730 | * set up the iterator to start reading from the cells list and return the | |
731 | * first item | |
732 | */ | |
733 | static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos) | |
08e0e7c8 | 734 | __acquires(m->private->servers_lock) |
1da177e4 LT |
735 | { |
736 | struct list_head *_p; | |
737 | struct afs_cell *cell = m->private; | |
738 | loff_t pos = *_pos; | |
739 | ||
740 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
741 | ||
742 | /* lock the list against modification */ | |
08e0e7c8 | 743 | read_lock(&cell->servers_lock); |
1da177e4 LT |
744 | |
745 | /* allow for the header line */ | |
746 | if (!pos) | |
747 | return (void *) 1; | |
748 | pos--; | |
749 | ||
750 | /* find the n'th element in the list */ | |
08e0e7c8 | 751 | list_for_each(_p, &cell->servers) |
1da177e4 LT |
752 | if (!pos--) |
753 | break; | |
754 | ||
08e0e7c8 | 755 | return _p != &cell->servers ? _p : NULL; |
ec26815a | 756 | } |
1da177e4 | 757 | |
1da177e4 LT |
758 | /* |
759 | * move to next cell in cells list | |
760 | */ | |
761 | static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, | |
762 | loff_t *_pos) | |
763 | { | |
764 | struct list_head *_p; | |
765 | struct afs_cell *cell = p->private; | |
766 | ||
767 | _enter("cell=%p pos=%Ld", cell, *_pos); | |
768 | ||
769 | (*_pos)++; | |
770 | ||
771 | _p = v; | |
08e0e7c8 | 772 | _p = v == (void *) 1 ? cell->servers.next : _p->next; |
1da177e4 | 773 | |
08e0e7c8 | 774 | return _p != &cell->servers ? _p : NULL; |
ec26815a | 775 | } |
1da177e4 | 776 | |
1da177e4 LT |
777 | /* |
778 | * clean up after reading from the cells list | |
779 | */ | |
780 | static void afs_proc_cell_servers_stop(struct seq_file *p, void *v) | |
08e0e7c8 | 781 | __releases(p->private->servers_lock) |
1da177e4 LT |
782 | { |
783 | struct afs_cell *cell = p->private; | |
784 | ||
08e0e7c8 | 785 | read_unlock(&cell->servers_lock); |
ec26815a | 786 | } |
1da177e4 | 787 | |
1da177e4 LT |
788 | /* |
789 | * display a header line followed by a load of volume lines | |
790 | */ | |
791 | static int afs_proc_cell_servers_show(struct seq_file *m, void *v) | |
792 | { | |
793 | struct afs_server *server = list_entry(v, struct afs_server, link); | |
794 | char ipaddr[20]; | |
795 | ||
796 | /* display header on line 1 */ | |
797 | if (v == (void *) 1) { | |
798 | seq_puts(m, "USE ADDR STATE\n"); | |
799 | return 0; | |
800 | } | |
801 | ||
802 | /* display one cell per line on subsequent lines */ | |
803 | sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(server->addr)); | |
804 | seq_printf(m, "%3d %-15.15s %5d\n", | |
ec26815a | 805 | atomic_read(&server->usage), ipaddr, server->fs_state); |
1da177e4 LT |
806 | |
807 | return 0; | |
ec26815a | 808 | } |