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8667d434 DH |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* Daemon interface | |
3 | * | |
4 | * Copyright (C) 2007, 2021 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/completion.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/namei.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/mount.h> | |
18 | #include <linux/statfs.h> | |
19 | #include <linux/ctype.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs_struct.h> | |
22 | #include "internal.h" | |
23 | ||
24 | static int cachefiles_daemon_open(struct inode *, struct file *); | |
25 | static int cachefiles_daemon_release(struct inode *, struct file *); | |
26 | static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t, | |
27 | loff_t *); | |
28 | static ssize_t cachefiles_daemon_write(struct file *, const char __user *, | |
29 | size_t, loff_t *); | |
30 | static __poll_t cachefiles_daemon_poll(struct file *, | |
31 | struct poll_table_struct *); | |
32 | static int cachefiles_daemon_frun(struct cachefiles_cache *, char *); | |
33 | static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *); | |
34 | static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *); | |
35 | static int cachefiles_daemon_brun(struct cachefiles_cache *, char *); | |
36 | static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *); | |
37 | static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *); | |
38 | static int cachefiles_daemon_cull(struct cachefiles_cache *, char *); | |
39 | static int cachefiles_daemon_debug(struct cachefiles_cache *, char *); | |
40 | static int cachefiles_daemon_dir(struct cachefiles_cache *, char *); | |
41 | static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *); | |
42 | static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *); | |
43 | static int cachefiles_daemon_tag(struct cachefiles_cache *, char *); | |
44 | static int cachefiles_daemon_bind(struct cachefiles_cache *, char *); | |
45 | static void cachefiles_daemon_unbind(struct cachefiles_cache *); | |
46 | ||
47 | static unsigned long cachefiles_open; | |
48 | ||
49 | const struct file_operations cachefiles_daemon_fops = { | |
50 | .owner = THIS_MODULE, | |
51 | .open = cachefiles_daemon_open, | |
52 | .release = cachefiles_daemon_release, | |
53 | .read = cachefiles_daemon_read, | |
54 | .write = cachefiles_daemon_write, | |
55 | .poll = cachefiles_daemon_poll, | |
56 | .llseek = noop_llseek, | |
57 | }; | |
58 | ||
59 | struct cachefiles_daemon_cmd { | |
60 | char name[8]; | |
61 | int (*handler)(struct cachefiles_cache *cache, char *args); | |
62 | }; | |
63 | ||
64 | static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = { | |
65 | { "bind", cachefiles_daemon_bind }, | |
66 | { "brun", cachefiles_daemon_brun }, | |
67 | { "bcull", cachefiles_daemon_bcull }, | |
68 | { "bstop", cachefiles_daemon_bstop }, | |
69 | { "cull", cachefiles_daemon_cull }, | |
70 | { "debug", cachefiles_daemon_debug }, | |
71 | { "dir", cachefiles_daemon_dir }, | |
72 | { "frun", cachefiles_daemon_frun }, | |
73 | { "fcull", cachefiles_daemon_fcull }, | |
74 | { "fstop", cachefiles_daemon_fstop }, | |
75 | { "inuse", cachefiles_daemon_inuse }, | |
76 | { "secctx", cachefiles_daemon_secctx }, | |
77 | { "tag", cachefiles_daemon_tag }, | |
78 | { "", NULL } | |
79 | }; | |
80 | ||
81 | ||
82 | /* | |
83 | * Prepare a cache for caching. | |
84 | */ | |
85 | static int cachefiles_daemon_open(struct inode *inode, struct file *file) | |
86 | { | |
87 | struct cachefiles_cache *cache; | |
88 | ||
89 | _enter(""); | |
90 | ||
91 | /* only the superuser may do this */ | |
92 | if (!capable(CAP_SYS_ADMIN)) | |
93 | return -EPERM; | |
94 | ||
95 | /* the cachefiles device may only be open once at a time */ | |
96 | if (xchg(&cachefiles_open, 1) == 1) | |
97 | return -EBUSY; | |
98 | ||
99 | /* allocate a cache record */ | |
100 | cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL); | |
101 | if (!cache) { | |
102 | cachefiles_open = 0; | |
103 | return -ENOMEM; | |
104 | } | |
105 | ||
106 | mutex_init(&cache->daemon_mutex); | |
107 | init_waitqueue_head(&cache->daemon_pollwq); | |
fe2140e2 | 108 | INIT_LIST_HEAD(&cache->volumes); |
1f08c925 | 109 | INIT_LIST_HEAD(&cache->object_list); |
fe2140e2 | 110 | spin_lock_init(&cache->object_list_lock); |
8667d434 DH |
111 | |
112 | /* set default caching limits | |
113 | * - limit at 1% free space and/or free files | |
114 | * - cull below 5% free space and/or free files | |
115 | * - cease culling above 7% free space and/or free files | |
116 | */ | |
117 | cache->frun_percent = 7; | |
118 | cache->fcull_percent = 5; | |
119 | cache->fstop_percent = 1; | |
120 | cache->brun_percent = 7; | |
121 | cache->bcull_percent = 5; | |
122 | cache->bstop_percent = 1; | |
123 | ||
124 | file->private_data = cache; | |
125 | cache->cachefilesd = file; | |
126 | return 0; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Release a cache. | |
131 | */ | |
132 | static int cachefiles_daemon_release(struct inode *inode, struct file *file) | |
133 | { | |
134 | struct cachefiles_cache *cache = file->private_data; | |
135 | ||
136 | _enter(""); | |
137 | ||
138 | ASSERT(cache); | |
139 | ||
140 | set_bit(CACHEFILES_DEAD, &cache->flags); | |
141 | ||
142 | cachefiles_daemon_unbind(cache); | |
143 | ||
144 | /* clean up the control file interface */ | |
145 | cache->cachefilesd = NULL; | |
146 | file->private_data = NULL; | |
147 | cachefiles_open = 0; | |
148 | ||
149 | kfree(cache); | |
150 | ||
151 | _leave(""); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Read the cache state. | |
157 | */ | |
158 | static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer, | |
159 | size_t buflen, loff_t *pos) | |
160 | { | |
161 | struct cachefiles_cache *cache = file->private_data; | |
162 | unsigned long long b_released; | |
163 | unsigned f_released; | |
164 | char buffer[256]; | |
165 | int n; | |
166 | ||
167 | //_enter(",,%zu,", buflen); | |
168 | ||
169 | if (!test_bit(CACHEFILES_READY, &cache->flags)) | |
170 | return 0; | |
171 | ||
172 | /* check how much space the cache has */ | |
3929eca7 | 173 | cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check); |
8667d434 DH |
174 | |
175 | /* summarise */ | |
176 | f_released = atomic_xchg(&cache->f_released, 0); | |
177 | b_released = atomic_long_xchg(&cache->b_released, 0); | |
178 | clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags); | |
179 | ||
180 | n = snprintf(buffer, sizeof(buffer), | |
181 | "cull=%c" | |
182 | " frun=%llx" | |
183 | " fcull=%llx" | |
184 | " fstop=%llx" | |
185 | " brun=%llx" | |
186 | " bcull=%llx" | |
187 | " bstop=%llx" | |
188 | " freleased=%x" | |
189 | " breleased=%llx", | |
190 | test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0', | |
191 | (unsigned long long) cache->frun, | |
192 | (unsigned long long) cache->fcull, | |
193 | (unsigned long long) cache->fstop, | |
194 | (unsigned long long) cache->brun, | |
195 | (unsigned long long) cache->bcull, | |
196 | (unsigned long long) cache->bstop, | |
197 | f_released, | |
198 | b_released); | |
199 | ||
200 | if (n > buflen) | |
201 | return -EMSGSIZE; | |
202 | ||
203 | if (copy_to_user(_buffer, buffer, n) != 0) | |
204 | return -EFAULT; | |
205 | ||
206 | return n; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Take a command from cachefilesd, parse it and act on it. | |
211 | */ | |
212 | static ssize_t cachefiles_daemon_write(struct file *file, | |
213 | const char __user *_data, | |
214 | size_t datalen, | |
215 | loff_t *pos) | |
216 | { | |
217 | const struct cachefiles_daemon_cmd *cmd; | |
218 | struct cachefiles_cache *cache = file->private_data; | |
219 | ssize_t ret; | |
220 | char *data, *args, *cp; | |
221 | ||
222 | //_enter(",,%zu,", datalen); | |
223 | ||
224 | ASSERT(cache); | |
225 | ||
226 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) | |
227 | return -EIO; | |
228 | ||
229 | if (datalen > PAGE_SIZE - 1) | |
230 | return -EOPNOTSUPP; | |
231 | ||
232 | /* drag the command string into the kernel so we can parse it */ | |
233 | data = memdup_user_nul(_data, datalen); | |
234 | if (IS_ERR(data)) | |
235 | return PTR_ERR(data); | |
236 | ||
237 | ret = -EINVAL; | |
238 | if (memchr(data, '\0', datalen)) | |
239 | goto error; | |
240 | ||
241 | /* strip any newline */ | |
242 | cp = memchr(data, '\n', datalen); | |
243 | if (cp) { | |
244 | if (cp == data) | |
245 | goto error; | |
246 | ||
247 | *cp = '\0'; | |
248 | } | |
249 | ||
250 | /* parse the command */ | |
251 | ret = -EOPNOTSUPP; | |
252 | ||
253 | for (args = data; *args; args++) | |
254 | if (isspace(*args)) | |
255 | break; | |
256 | if (*args) { | |
257 | if (args == data) | |
258 | goto error; | |
259 | *args = '\0'; | |
260 | args = skip_spaces(++args); | |
261 | } | |
262 | ||
263 | /* run the appropriate command handler */ | |
264 | for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++) | |
265 | if (strcmp(cmd->name, data) == 0) | |
266 | goto found_command; | |
267 | ||
268 | error: | |
269 | kfree(data); | |
270 | //_leave(" = %zd", ret); | |
271 | return ret; | |
272 | ||
273 | found_command: | |
274 | mutex_lock(&cache->daemon_mutex); | |
275 | ||
276 | ret = -EIO; | |
277 | if (!test_bit(CACHEFILES_DEAD, &cache->flags)) | |
278 | ret = cmd->handler(cache, args); | |
279 | ||
280 | mutex_unlock(&cache->daemon_mutex); | |
281 | ||
282 | if (ret == 0) | |
283 | ret = datalen; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Poll for culling state | |
289 | * - use EPOLLOUT to indicate culling state | |
290 | */ | |
291 | static __poll_t cachefiles_daemon_poll(struct file *file, | |
292 | struct poll_table_struct *poll) | |
293 | { | |
294 | struct cachefiles_cache *cache = file->private_data; | |
295 | __poll_t mask; | |
296 | ||
297 | poll_wait(file, &cache->daemon_pollwq, poll); | |
298 | mask = 0; | |
299 | ||
300 | if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags)) | |
301 | mask |= EPOLLIN; | |
302 | ||
303 | if (test_bit(CACHEFILES_CULLING, &cache->flags)) | |
304 | mask |= EPOLLOUT; | |
305 | ||
306 | return mask; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Give a range error for cache space constraints | |
311 | * - can be tail-called | |
312 | */ | |
313 | static int cachefiles_daemon_range_error(struct cachefiles_cache *cache, | |
314 | char *args) | |
315 | { | |
316 | pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n"); | |
317 | ||
318 | return -EINVAL; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Set the percentage of files at which to stop culling | |
323 | * - command: "frun <N>%" | |
324 | */ | |
325 | static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args) | |
326 | { | |
327 | unsigned long frun; | |
328 | ||
329 | _enter(",%s", args); | |
330 | ||
331 | if (!*args) | |
332 | return -EINVAL; | |
333 | ||
334 | frun = simple_strtoul(args, &args, 10); | |
335 | if (args[0] != '%' || args[1] != '\0') | |
336 | return -EINVAL; | |
337 | ||
338 | if (frun <= cache->fcull_percent || frun >= 100) | |
339 | return cachefiles_daemon_range_error(cache, args); | |
340 | ||
341 | cache->frun_percent = frun; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Set the percentage of files at which to start culling | |
347 | * - command: "fcull <N>%" | |
348 | */ | |
349 | static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args) | |
350 | { | |
351 | unsigned long fcull; | |
352 | ||
353 | _enter(",%s", args); | |
354 | ||
355 | if (!*args) | |
356 | return -EINVAL; | |
357 | ||
358 | fcull = simple_strtoul(args, &args, 10); | |
359 | if (args[0] != '%' || args[1] != '\0') | |
360 | return -EINVAL; | |
361 | ||
362 | if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent) | |
363 | return cachefiles_daemon_range_error(cache, args); | |
364 | ||
365 | cache->fcull_percent = fcull; | |
366 | return 0; | |
367 | } | |
368 | ||
369 | /* | |
370 | * Set the percentage of files at which to stop allocating | |
371 | * - command: "fstop <N>%" | |
372 | */ | |
373 | static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args) | |
374 | { | |
375 | unsigned long fstop; | |
376 | ||
377 | _enter(",%s", args); | |
378 | ||
379 | if (!*args) | |
380 | return -EINVAL; | |
381 | ||
382 | fstop = simple_strtoul(args, &args, 10); | |
383 | if (args[0] != '%' || args[1] != '\0') | |
384 | return -EINVAL; | |
385 | ||
386 | if (fstop >= cache->fcull_percent) | |
387 | return cachefiles_daemon_range_error(cache, args); | |
388 | ||
389 | cache->fstop_percent = fstop; | |
390 | return 0; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Set the percentage of blocks at which to stop culling | |
395 | * - command: "brun <N>%" | |
396 | */ | |
397 | static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args) | |
398 | { | |
399 | unsigned long brun; | |
400 | ||
401 | _enter(",%s", args); | |
402 | ||
403 | if (!*args) | |
404 | return -EINVAL; | |
405 | ||
406 | brun = simple_strtoul(args, &args, 10); | |
407 | if (args[0] != '%' || args[1] != '\0') | |
408 | return -EINVAL; | |
409 | ||
410 | if (brun <= cache->bcull_percent || brun >= 100) | |
411 | return cachefiles_daemon_range_error(cache, args); | |
412 | ||
413 | cache->brun_percent = brun; | |
414 | return 0; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Set the percentage of blocks at which to start culling | |
419 | * - command: "bcull <N>%" | |
420 | */ | |
421 | static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args) | |
422 | { | |
423 | unsigned long bcull; | |
424 | ||
425 | _enter(",%s", args); | |
426 | ||
427 | if (!*args) | |
428 | return -EINVAL; | |
429 | ||
430 | bcull = simple_strtoul(args, &args, 10); | |
431 | if (args[0] != '%' || args[1] != '\0') | |
432 | return -EINVAL; | |
433 | ||
434 | if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent) | |
435 | return cachefiles_daemon_range_error(cache, args); | |
436 | ||
437 | cache->bcull_percent = bcull; | |
438 | return 0; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Set the percentage of blocks at which to stop allocating | |
443 | * - command: "bstop <N>%" | |
444 | */ | |
445 | static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args) | |
446 | { | |
447 | unsigned long bstop; | |
448 | ||
449 | _enter(",%s", args); | |
450 | ||
451 | if (!*args) | |
452 | return -EINVAL; | |
453 | ||
454 | bstop = simple_strtoul(args, &args, 10); | |
455 | if (args[0] != '%' || args[1] != '\0') | |
456 | return -EINVAL; | |
457 | ||
458 | if (bstop >= cache->bcull_percent) | |
459 | return cachefiles_daemon_range_error(cache, args); | |
460 | ||
461 | cache->bstop_percent = bstop; | |
462 | return 0; | |
463 | } | |
464 | ||
465 | /* | |
466 | * Set the cache directory | |
467 | * - command: "dir <name>" | |
468 | */ | |
469 | static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args) | |
470 | { | |
471 | char *dir; | |
472 | ||
473 | _enter(",%s", args); | |
474 | ||
475 | if (!*args) { | |
476 | pr_err("Empty directory specified\n"); | |
477 | return -EINVAL; | |
478 | } | |
479 | ||
480 | if (cache->rootdirname) { | |
481 | pr_err("Second cache directory specified\n"); | |
482 | return -EEXIST; | |
483 | } | |
484 | ||
485 | dir = kstrdup(args, GFP_KERNEL); | |
486 | if (!dir) | |
487 | return -ENOMEM; | |
488 | ||
489 | cache->rootdirname = dir; | |
490 | return 0; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Set the cache security context | |
495 | * - command: "secctx <ctx>" | |
496 | */ | |
497 | static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args) | |
498 | { | |
499 | char *secctx; | |
500 | ||
501 | _enter(",%s", args); | |
502 | ||
503 | if (!*args) { | |
504 | pr_err("Empty security context specified\n"); | |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | if (cache->secctx) { | |
509 | pr_err("Second security context specified\n"); | |
510 | return -EINVAL; | |
511 | } | |
512 | ||
513 | secctx = kstrdup(args, GFP_KERNEL); | |
514 | if (!secctx) | |
515 | return -ENOMEM; | |
516 | ||
517 | cache->secctx = secctx; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Set the cache tag | |
523 | * - command: "tag <name>" | |
524 | */ | |
525 | static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args) | |
526 | { | |
527 | char *tag; | |
528 | ||
529 | _enter(",%s", args); | |
530 | ||
531 | if (!*args) { | |
532 | pr_err("Empty tag specified\n"); | |
533 | return -EINVAL; | |
534 | } | |
535 | ||
536 | if (cache->tag) | |
537 | return -EEXIST; | |
538 | ||
539 | tag = kstrdup(args, GFP_KERNEL); | |
540 | if (!tag) | |
541 | return -ENOMEM; | |
542 | ||
543 | cache->tag = tag; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Request a node in the cache be culled from the current working directory | |
549 | * - command: "cull <name>" | |
550 | */ | |
551 | static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args) | |
552 | { | |
553 | struct path path; | |
554 | const struct cred *saved_cred; | |
555 | int ret; | |
556 | ||
557 | _enter(",%s", args); | |
558 | ||
559 | if (strchr(args, '/')) | |
560 | goto inval; | |
561 | ||
562 | if (!test_bit(CACHEFILES_READY, &cache->flags)) { | |
563 | pr_err("cull applied to unready cache\n"); | |
564 | return -EIO; | |
565 | } | |
566 | ||
567 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) { | |
568 | pr_err("cull applied to dead cache\n"); | |
569 | return -EIO; | |
570 | } | |
571 | ||
572 | get_fs_pwd(current->fs, &path); | |
573 | ||
574 | if (!d_can_lookup(path.dentry)) | |
575 | goto notdir; | |
576 | ||
577 | cachefiles_begin_secure(cache, &saved_cred); | |
07a90e97 | 578 | ret = cachefiles_cull(cache, path.dentry, args); |
8667d434 DH |
579 | cachefiles_end_secure(cache, saved_cred); |
580 | ||
581 | path_put(&path); | |
582 | _leave(" = %d", ret); | |
583 | return ret; | |
584 | ||
585 | notdir: | |
586 | path_put(&path); | |
587 | pr_err("cull command requires dirfd to be a directory\n"); | |
588 | return -ENOTDIR; | |
589 | ||
590 | inval: | |
591 | pr_err("cull command requires dirfd and filename\n"); | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Set debugging mode | |
597 | * - command: "debug <mask>" | |
598 | */ | |
599 | static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args) | |
600 | { | |
601 | unsigned long mask; | |
602 | ||
603 | _enter(",%s", args); | |
604 | ||
605 | mask = simple_strtoul(args, &args, 0); | |
606 | if (args[0] != '\0') | |
607 | goto inval; | |
608 | ||
609 | cachefiles_debug = mask; | |
610 | _leave(" = 0"); | |
611 | return 0; | |
612 | ||
613 | inval: | |
614 | pr_err("debug command requires mask\n"); | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
618 | /* | |
619 | * Find out whether an object in the current working directory is in use or not | |
620 | * - command: "inuse <name>" | |
621 | */ | |
622 | static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args) | |
623 | { | |
624 | struct path path; | |
625 | const struct cred *saved_cred; | |
626 | int ret; | |
627 | ||
628 | //_enter(",%s", args); | |
629 | ||
630 | if (strchr(args, '/')) | |
631 | goto inval; | |
632 | ||
633 | if (!test_bit(CACHEFILES_READY, &cache->flags)) { | |
634 | pr_err("inuse applied to unready cache\n"); | |
635 | return -EIO; | |
636 | } | |
637 | ||
638 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) { | |
639 | pr_err("inuse applied to dead cache\n"); | |
640 | return -EIO; | |
641 | } | |
642 | ||
643 | get_fs_pwd(current->fs, &path); | |
644 | ||
645 | if (!d_can_lookup(path.dentry)) | |
646 | goto notdir; | |
647 | ||
648 | cachefiles_begin_secure(cache, &saved_cred); | |
07a90e97 | 649 | ret = cachefiles_check_in_use(cache, path.dentry, args); |
8667d434 DH |
650 | cachefiles_end_secure(cache, saved_cred); |
651 | ||
652 | path_put(&path); | |
653 | //_leave(" = %d", ret); | |
654 | return ret; | |
655 | ||
656 | notdir: | |
657 | path_put(&path); | |
658 | pr_err("inuse command requires dirfd to be a directory\n"); | |
659 | return -ENOTDIR; | |
660 | ||
661 | inval: | |
662 | pr_err("inuse command requires dirfd and filename\n"); | |
663 | return -EINVAL; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Bind a directory as a cache | |
668 | */ | |
669 | static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args) | |
670 | { | |
671 | _enter("{%u,%u,%u,%u,%u,%u},%s", | |
672 | cache->frun_percent, | |
673 | cache->fcull_percent, | |
674 | cache->fstop_percent, | |
675 | cache->brun_percent, | |
676 | cache->bcull_percent, | |
677 | cache->bstop_percent, | |
678 | args); | |
679 | ||
680 | if (cache->fstop_percent >= cache->fcull_percent || | |
681 | cache->fcull_percent >= cache->frun_percent || | |
682 | cache->frun_percent >= 100) | |
683 | return -ERANGE; | |
684 | ||
685 | if (cache->bstop_percent >= cache->bcull_percent || | |
686 | cache->bcull_percent >= cache->brun_percent || | |
687 | cache->brun_percent >= 100) | |
688 | return -ERANGE; | |
689 | ||
690 | if (*args) { | |
691 | pr_err("'bind' command doesn't take an argument\n"); | |
692 | return -EINVAL; | |
693 | } | |
694 | ||
695 | if (!cache->rootdirname) { | |
696 | pr_err("No cache directory specified\n"); | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | /* Don't permit already bound caches to be re-bound */ | |
701 | if (test_bit(CACHEFILES_READY, &cache->flags)) { | |
702 | pr_err("Cache already bound\n"); | |
703 | return -EBUSY; | |
704 | } | |
705 | ||
ecd1a5f6 | 706 | return cachefiles_add_cache(cache); |
8667d434 DH |
707 | } |
708 | ||
709 | /* | |
710 | * Unbind a cache. | |
711 | */ | |
712 | static void cachefiles_daemon_unbind(struct cachefiles_cache *cache) | |
713 | { | |
714 | _enter(""); | |
715 | ||
d1065b0a DH |
716 | if (test_bit(CACHEFILES_READY, &cache->flags)) |
717 | cachefiles_withdraw_cache(cache); | |
8667d434 | 718 | |
d1065b0a DH |
719 | cachefiles_put_directory(cache->graveyard); |
720 | cachefiles_put_directory(cache->store); | |
8667d434 DH |
721 | mntput(cache->mnt); |
722 | ||
723 | kfree(cache->rootdirname); | |
724 | kfree(cache->secctx); | |
725 | kfree(cache->tag); | |
726 | ||
727 | _leave(""); | |
728 | } |