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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 DH |
108 | INIT_LIST_HEAD(&cache->volumes); |
109 | spin_lock_init(&cache->object_list_lock); | |
8667d434 DH |
110 | |
111 | /* set default caching limits | |
112 | * - limit at 1% free space and/or free files | |
113 | * - cull below 5% free space and/or free files | |
114 | * - cease culling above 7% free space and/or free files | |
115 | */ | |
116 | cache->frun_percent = 7; | |
117 | cache->fcull_percent = 5; | |
118 | cache->fstop_percent = 1; | |
119 | cache->brun_percent = 7; | |
120 | cache->bcull_percent = 5; | |
121 | cache->bstop_percent = 1; | |
122 | ||
123 | file->private_data = cache; | |
124 | cache->cachefilesd = file; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Release a cache. | |
130 | */ | |
131 | static int cachefiles_daemon_release(struct inode *inode, struct file *file) | |
132 | { | |
133 | struct cachefiles_cache *cache = file->private_data; | |
134 | ||
135 | _enter(""); | |
136 | ||
137 | ASSERT(cache); | |
138 | ||
139 | set_bit(CACHEFILES_DEAD, &cache->flags); | |
140 | ||
141 | cachefiles_daemon_unbind(cache); | |
142 | ||
143 | /* clean up the control file interface */ | |
144 | cache->cachefilesd = NULL; | |
145 | file->private_data = NULL; | |
146 | cachefiles_open = 0; | |
147 | ||
148 | kfree(cache); | |
149 | ||
150 | _leave(""); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Read the cache state. | |
156 | */ | |
157 | static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer, | |
158 | size_t buflen, loff_t *pos) | |
159 | { | |
160 | struct cachefiles_cache *cache = file->private_data; | |
161 | unsigned long long b_released; | |
162 | unsigned f_released; | |
163 | char buffer[256]; | |
164 | int n; | |
165 | ||
166 | //_enter(",,%zu,", buflen); | |
167 | ||
168 | if (!test_bit(CACHEFILES_READY, &cache->flags)) | |
169 | return 0; | |
170 | ||
171 | /* check how much space the cache has */ | |
80f94f29 | 172 | cachefiles_has_space(cache, 0, 0); |
8667d434 DH |
173 | |
174 | /* summarise */ | |
175 | f_released = atomic_xchg(&cache->f_released, 0); | |
176 | b_released = atomic_long_xchg(&cache->b_released, 0); | |
177 | clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags); | |
178 | ||
179 | n = snprintf(buffer, sizeof(buffer), | |
180 | "cull=%c" | |
181 | " frun=%llx" | |
182 | " fcull=%llx" | |
183 | " fstop=%llx" | |
184 | " brun=%llx" | |
185 | " bcull=%llx" | |
186 | " bstop=%llx" | |
187 | " freleased=%x" | |
188 | " breleased=%llx", | |
189 | test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0', | |
190 | (unsigned long long) cache->frun, | |
191 | (unsigned long long) cache->fcull, | |
192 | (unsigned long long) cache->fstop, | |
193 | (unsigned long long) cache->brun, | |
194 | (unsigned long long) cache->bcull, | |
195 | (unsigned long long) cache->bstop, | |
196 | f_released, | |
197 | b_released); | |
198 | ||
199 | if (n > buflen) | |
200 | return -EMSGSIZE; | |
201 | ||
202 | if (copy_to_user(_buffer, buffer, n) != 0) | |
203 | return -EFAULT; | |
204 | ||
205 | return n; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Take a command from cachefilesd, parse it and act on it. | |
210 | */ | |
211 | static ssize_t cachefiles_daemon_write(struct file *file, | |
212 | const char __user *_data, | |
213 | size_t datalen, | |
214 | loff_t *pos) | |
215 | { | |
216 | const struct cachefiles_daemon_cmd *cmd; | |
217 | struct cachefiles_cache *cache = file->private_data; | |
218 | ssize_t ret; | |
219 | char *data, *args, *cp; | |
220 | ||
221 | //_enter(",,%zu,", datalen); | |
222 | ||
223 | ASSERT(cache); | |
224 | ||
225 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) | |
226 | return -EIO; | |
227 | ||
228 | if (datalen > PAGE_SIZE - 1) | |
229 | return -EOPNOTSUPP; | |
230 | ||
231 | /* drag the command string into the kernel so we can parse it */ | |
232 | data = memdup_user_nul(_data, datalen); | |
233 | if (IS_ERR(data)) | |
234 | return PTR_ERR(data); | |
235 | ||
236 | ret = -EINVAL; | |
237 | if (memchr(data, '\0', datalen)) | |
238 | goto error; | |
239 | ||
240 | /* strip any newline */ | |
241 | cp = memchr(data, '\n', datalen); | |
242 | if (cp) { | |
243 | if (cp == data) | |
244 | goto error; | |
245 | ||
246 | *cp = '\0'; | |
247 | } | |
248 | ||
249 | /* parse the command */ | |
250 | ret = -EOPNOTSUPP; | |
251 | ||
252 | for (args = data; *args; args++) | |
253 | if (isspace(*args)) | |
254 | break; | |
255 | if (*args) { | |
256 | if (args == data) | |
257 | goto error; | |
258 | *args = '\0'; | |
259 | args = skip_spaces(++args); | |
260 | } | |
261 | ||
262 | /* run the appropriate command handler */ | |
263 | for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++) | |
264 | if (strcmp(cmd->name, data) == 0) | |
265 | goto found_command; | |
266 | ||
267 | error: | |
268 | kfree(data); | |
269 | //_leave(" = %zd", ret); | |
270 | return ret; | |
271 | ||
272 | found_command: | |
273 | mutex_lock(&cache->daemon_mutex); | |
274 | ||
275 | ret = -EIO; | |
276 | if (!test_bit(CACHEFILES_DEAD, &cache->flags)) | |
277 | ret = cmd->handler(cache, args); | |
278 | ||
279 | mutex_unlock(&cache->daemon_mutex); | |
280 | ||
281 | if (ret == 0) | |
282 | ret = datalen; | |
283 | goto error; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Poll for culling state | |
288 | * - use EPOLLOUT to indicate culling state | |
289 | */ | |
290 | static __poll_t cachefiles_daemon_poll(struct file *file, | |
291 | struct poll_table_struct *poll) | |
292 | { | |
293 | struct cachefiles_cache *cache = file->private_data; | |
294 | __poll_t mask; | |
295 | ||
296 | poll_wait(file, &cache->daemon_pollwq, poll); | |
297 | mask = 0; | |
298 | ||
299 | if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags)) | |
300 | mask |= EPOLLIN; | |
301 | ||
302 | if (test_bit(CACHEFILES_CULLING, &cache->flags)) | |
303 | mask |= EPOLLOUT; | |
304 | ||
305 | return mask; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Give a range error for cache space constraints | |
310 | * - can be tail-called | |
311 | */ | |
312 | static int cachefiles_daemon_range_error(struct cachefiles_cache *cache, | |
313 | char *args) | |
314 | { | |
315 | pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n"); | |
316 | ||
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Set the percentage of files at which to stop culling | |
322 | * - command: "frun <N>%" | |
323 | */ | |
324 | static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args) | |
325 | { | |
326 | unsigned long frun; | |
327 | ||
328 | _enter(",%s", args); | |
329 | ||
330 | if (!*args) | |
331 | return -EINVAL; | |
332 | ||
333 | frun = simple_strtoul(args, &args, 10); | |
334 | if (args[0] != '%' || args[1] != '\0') | |
335 | return -EINVAL; | |
336 | ||
337 | if (frun <= cache->fcull_percent || frun >= 100) | |
338 | return cachefiles_daemon_range_error(cache, args); | |
339 | ||
340 | cache->frun_percent = frun; | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Set the percentage of files at which to start culling | |
346 | * - command: "fcull <N>%" | |
347 | */ | |
348 | static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args) | |
349 | { | |
350 | unsigned long fcull; | |
351 | ||
352 | _enter(",%s", args); | |
353 | ||
354 | if (!*args) | |
355 | return -EINVAL; | |
356 | ||
357 | fcull = simple_strtoul(args, &args, 10); | |
358 | if (args[0] != '%' || args[1] != '\0') | |
359 | return -EINVAL; | |
360 | ||
361 | if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent) | |
362 | return cachefiles_daemon_range_error(cache, args); | |
363 | ||
364 | cache->fcull_percent = fcull; | |
365 | return 0; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Set the percentage of files at which to stop allocating | |
370 | * - command: "fstop <N>%" | |
371 | */ | |
372 | static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args) | |
373 | { | |
374 | unsigned long fstop; | |
375 | ||
376 | _enter(",%s", args); | |
377 | ||
378 | if (!*args) | |
379 | return -EINVAL; | |
380 | ||
381 | fstop = simple_strtoul(args, &args, 10); | |
382 | if (args[0] != '%' || args[1] != '\0') | |
383 | return -EINVAL; | |
384 | ||
385 | if (fstop >= cache->fcull_percent) | |
386 | return cachefiles_daemon_range_error(cache, args); | |
387 | ||
388 | cache->fstop_percent = fstop; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Set the percentage of blocks at which to stop culling | |
394 | * - command: "brun <N>%" | |
395 | */ | |
396 | static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args) | |
397 | { | |
398 | unsigned long brun; | |
399 | ||
400 | _enter(",%s", args); | |
401 | ||
402 | if (!*args) | |
403 | return -EINVAL; | |
404 | ||
405 | brun = simple_strtoul(args, &args, 10); | |
406 | if (args[0] != '%' || args[1] != '\0') | |
407 | return -EINVAL; | |
408 | ||
409 | if (brun <= cache->bcull_percent || brun >= 100) | |
410 | return cachefiles_daemon_range_error(cache, args); | |
411 | ||
412 | cache->brun_percent = brun; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Set the percentage of blocks at which to start culling | |
418 | * - command: "bcull <N>%" | |
419 | */ | |
420 | static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args) | |
421 | { | |
422 | unsigned long bcull; | |
423 | ||
424 | _enter(",%s", args); | |
425 | ||
426 | if (!*args) | |
427 | return -EINVAL; | |
428 | ||
429 | bcull = simple_strtoul(args, &args, 10); | |
430 | if (args[0] != '%' || args[1] != '\0') | |
431 | return -EINVAL; | |
432 | ||
433 | if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent) | |
434 | return cachefiles_daemon_range_error(cache, args); | |
435 | ||
436 | cache->bcull_percent = bcull; | |
437 | return 0; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Set the percentage of blocks at which to stop allocating | |
442 | * - command: "bstop <N>%" | |
443 | */ | |
444 | static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args) | |
445 | { | |
446 | unsigned long bstop; | |
447 | ||
448 | _enter(",%s", args); | |
449 | ||
450 | if (!*args) | |
451 | return -EINVAL; | |
452 | ||
453 | bstop = simple_strtoul(args, &args, 10); | |
454 | if (args[0] != '%' || args[1] != '\0') | |
455 | return -EINVAL; | |
456 | ||
457 | if (bstop >= cache->bcull_percent) | |
458 | return cachefiles_daemon_range_error(cache, args); | |
459 | ||
460 | cache->bstop_percent = bstop; | |
461 | return 0; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Set the cache directory | |
466 | * - command: "dir <name>" | |
467 | */ | |
468 | static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args) | |
469 | { | |
470 | char *dir; | |
471 | ||
472 | _enter(",%s", args); | |
473 | ||
474 | if (!*args) { | |
475 | pr_err("Empty directory specified\n"); | |
476 | return -EINVAL; | |
477 | } | |
478 | ||
479 | if (cache->rootdirname) { | |
480 | pr_err("Second cache directory specified\n"); | |
481 | return -EEXIST; | |
482 | } | |
483 | ||
484 | dir = kstrdup(args, GFP_KERNEL); | |
485 | if (!dir) | |
486 | return -ENOMEM; | |
487 | ||
488 | cache->rootdirname = dir; | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Set the cache security context | |
494 | * - command: "secctx <ctx>" | |
495 | */ | |
496 | static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args) | |
497 | { | |
498 | char *secctx; | |
499 | ||
500 | _enter(",%s", args); | |
501 | ||
502 | if (!*args) { | |
503 | pr_err("Empty security context specified\n"); | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
507 | if (cache->secctx) { | |
508 | pr_err("Second security context specified\n"); | |
509 | return -EINVAL; | |
510 | } | |
511 | ||
512 | secctx = kstrdup(args, GFP_KERNEL); | |
513 | if (!secctx) | |
514 | return -ENOMEM; | |
515 | ||
516 | cache->secctx = secctx; | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Set the cache tag | |
522 | * - command: "tag <name>" | |
523 | */ | |
524 | static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args) | |
525 | { | |
526 | char *tag; | |
527 | ||
528 | _enter(",%s", args); | |
529 | ||
530 | if (!*args) { | |
531 | pr_err("Empty tag specified\n"); | |
532 | return -EINVAL; | |
533 | } | |
534 | ||
535 | if (cache->tag) | |
536 | return -EEXIST; | |
537 | ||
538 | tag = kstrdup(args, GFP_KERNEL); | |
539 | if (!tag) | |
540 | return -ENOMEM; | |
541 | ||
542 | cache->tag = tag; | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Request a node in the cache be culled from the current working directory | |
548 | * - command: "cull <name>" | |
549 | */ | |
550 | static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args) | |
551 | { | |
552 | struct path path; | |
553 | const struct cred *saved_cred; | |
554 | int ret; | |
555 | ||
556 | _enter(",%s", args); | |
557 | ||
558 | if (strchr(args, '/')) | |
559 | goto inval; | |
560 | ||
561 | if (!test_bit(CACHEFILES_READY, &cache->flags)) { | |
562 | pr_err("cull applied to unready cache\n"); | |
563 | return -EIO; | |
564 | } | |
565 | ||
566 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) { | |
567 | pr_err("cull applied to dead cache\n"); | |
568 | return -EIO; | |
569 | } | |
570 | ||
571 | get_fs_pwd(current->fs, &path); | |
572 | ||
573 | if (!d_can_lookup(path.dentry)) | |
574 | goto notdir; | |
575 | ||
576 | cachefiles_begin_secure(cache, &saved_cred); | |
07a90e97 | 577 | ret = cachefiles_cull(cache, path.dentry, args); |
8667d434 DH |
578 | cachefiles_end_secure(cache, saved_cred); |
579 | ||
580 | path_put(&path); | |
581 | _leave(" = %d", ret); | |
582 | return ret; | |
583 | ||
584 | notdir: | |
585 | path_put(&path); | |
586 | pr_err("cull command requires dirfd to be a directory\n"); | |
587 | return -ENOTDIR; | |
588 | ||
589 | inval: | |
590 | pr_err("cull command requires dirfd and filename\n"); | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | /* | |
595 | * Set debugging mode | |
596 | * - command: "debug <mask>" | |
597 | */ | |
598 | static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args) | |
599 | { | |
600 | unsigned long mask; | |
601 | ||
602 | _enter(",%s", args); | |
603 | ||
604 | mask = simple_strtoul(args, &args, 0); | |
605 | if (args[0] != '\0') | |
606 | goto inval; | |
607 | ||
608 | cachefiles_debug = mask; | |
609 | _leave(" = 0"); | |
610 | return 0; | |
611 | ||
612 | inval: | |
613 | pr_err("debug command requires mask\n"); | |
614 | return -EINVAL; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Find out whether an object in the current working directory is in use or not | |
619 | * - command: "inuse <name>" | |
620 | */ | |
621 | static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args) | |
622 | { | |
623 | struct path path; | |
624 | const struct cred *saved_cred; | |
625 | int ret; | |
626 | ||
627 | //_enter(",%s", args); | |
628 | ||
629 | if (strchr(args, '/')) | |
630 | goto inval; | |
631 | ||
632 | if (!test_bit(CACHEFILES_READY, &cache->flags)) { | |
633 | pr_err("inuse applied to unready cache\n"); | |
634 | return -EIO; | |
635 | } | |
636 | ||
637 | if (test_bit(CACHEFILES_DEAD, &cache->flags)) { | |
638 | pr_err("inuse applied to dead cache\n"); | |
639 | return -EIO; | |
640 | } | |
641 | ||
642 | get_fs_pwd(current->fs, &path); | |
643 | ||
644 | if (!d_can_lookup(path.dentry)) | |
645 | goto notdir; | |
646 | ||
647 | cachefiles_begin_secure(cache, &saved_cred); | |
07a90e97 | 648 | ret = cachefiles_check_in_use(cache, path.dentry, args); |
8667d434 DH |
649 | cachefiles_end_secure(cache, saved_cred); |
650 | ||
651 | path_put(&path); | |
652 | //_leave(" = %d", ret); | |
653 | return ret; | |
654 | ||
655 | notdir: | |
656 | path_put(&path); | |
657 | pr_err("inuse command requires dirfd to be a directory\n"); | |
658 | return -ENOTDIR; | |
659 | ||
660 | inval: | |
661 | pr_err("inuse command requires dirfd and filename\n"); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Bind a directory as a cache | |
667 | */ | |
668 | static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args) | |
669 | { | |
670 | _enter("{%u,%u,%u,%u,%u,%u},%s", | |
671 | cache->frun_percent, | |
672 | cache->fcull_percent, | |
673 | cache->fstop_percent, | |
674 | cache->brun_percent, | |
675 | cache->bcull_percent, | |
676 | cache->bstop_percent, | |
677 | args); | |
678 | ||
679 | if (cache->fstop_percent >= cache->fcull_percent || | |
680 | cache->fcull_percent >= cache->frun_percent || | |
681 | cache->frun_percent >= 100) | |
682 | return -ERANGE; | |
683 | ||
684 | if (cache->bstop_percent >= cache->bcull_percent || | |
685 | cache->bcull_percent >= cache->brun_percent || | |
686 | cache->brun_percent >= 100) | |
687 | return -ERANGE; | |
688 | ||
689 | if (*args) { | |
690 | pr_err("'bind' command doesn't take an argument\n"); | |
691 | return -EINVAL; | |
692 | } | |
693 | ||
694 | if (!cache->rootdirname) { | |
695 | pr_err("No cache directory specified\n"); | |
696 | return -EINVAL; | |
697 | } | |
698 | ||
699 | /* Don't permit already bound caches to be re-bound */ | |
700 | if (test_bit(CACHEFILES_READY, &cache->flags)) { | |
701 | pr_err("Cache already bound\n"); | |
702 | return -EBUSY; | |
703 | } | |
704 | ||
705 | pr_warn("Cache is disabled for development\n"); | |
706 | return -ENOANO; // Don't allow the cache to operate yet | |
d1065b0a | 707 | //return cachefiles_add_cache(cache); |
8667d434 DH |
708 | } |
709 | ||
710 | /* | |
711 | * Unbind a cache. | |
712 | */ | |
713 | static void cachefiles_daemon_unbind(struct cachefiles_cache *cache) | |
714 | { | |
715 | _enter(""); | |
716 | ||
d1065b0a DH |
717 | if (test_bit(CACHEFILES_READY, &cache->flags)) |
718 | cachefiles_withdraw_cache(cache); | |
8667d434 | 719 | |
d1065b0a DH |
720 | cachefiles_put_directory(cache->graveyard); |
721 | cachefiles_put_directory(cache->store); | |
8667d434 DH |
722 | mntput(cache->mnt); |
723 | ||
724 | kfree(cache->rootdirname); | |
725 | kfree(cache->secctx); | |
726 | kfree(cache->tag); | |
727 | ||
728 | _leave(""); | |
729 | } |