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9ae326a6 DH |
1 | /* FS-Cache interface to CacheFiles |
2 | * | |
3 | * Copyright (C) 2007 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 Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
9ae326a6 | 13 | #include <linux/mount.h> |
9ae326a6 DH |
14 | #include "internal.h" |
15 | ||
9ae326a6 DH |
16 | struct cachefiles_lookup_data { |
17 | struct cachefiles_xattr *auxdata; /* auxiliary data */ | |
18 | char *key; /* key path */ | |
19 | }; | |
20 | ||
21 | static int cachefiles_attr_changed(struct fscache_object *_object); | |
22 | ||
23 | /* | |
24 | * allocate an object record for a cookie lookup and prepare the lookup data | |
25 | */ | |
26 | static struct fscache_object *cachefiles_alloc_object( | |
27 | struct fscache_cache *_cache, | |
28 | struct fscache_cookie *cookie) | |
29 | { | |
30 | struct cachefiles_lookup_data *lookup_data; | |
31 | struct cachefiles_object *object; | |
32 | struct cachefiles_cache *cache; | |
33 | struct cachefiles_xattr *auxdata; | |
34 | unsigned keylen, auxlen; | |
402cb8dd | 35 | void *buffer, *p; |
9ae326a6 DH |
36 | char *key; |
37 | ||
38 | cache = container_of(_cache, struct cachefiles_cache, cache); | |
39 | ||
40 | _enter("{%s},%p,", cache->cache.identifier, cookie); | |
41 | ||
5f4f9f4a | 42 | lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp); |
9ae326a6 DH |
43 | if (!lookup_data) |
44 | goto nomem_lookup_data; | |
45 | ||
46 | /* create a new object record and a temporary leaf image */ | |
5f4f9f4a | 47 | object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp); |
9ae326a6 DH |
48 | if (!object) |
49 | goto nomem_object; | |
50 | ||
51 | ASSERTCMP(object->backer, ==, NULL); | |
52 | ||
53 | BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
54 | atomic_set(&object->usage, 1); | |
55 | ||
56 | fscache_object_init(&object->fscache, cookie, &cache->cache); | |
57 | ||
58 | object->type = cookie->def->type; | |
59 | ||
60 | /* get hold of the raw key | |
61 | * - stick the length on the front and leave space on the back for the | |
62 | * encoder | |
63 | */ | |
5f4f9f4a | 64 | buffer = kmalloc((2 + 512) + 3, cachefiles_gfp); |
9ae326a6 DH |
65 | if (!buffer) |
66 | goto nomem_buffer; | |
67 | ||
402cb8dd DH |
68 | keylen = cookie->key_len; |
69 | if (keylen <= sizeof(cookie->inline_key)) | |
70 | p = cookie->inline_key; | |
71 | else | |
72 | p = cookie->key; | |
73 | memcpy(buffer + 2, p, keylen); | |
9ae326a6 DH |
74 | |
75 | *(uint16_t *)buffer = keylen; | |
76 | ((char *)buffer)[keylen + 2] = 0; | |
77 | ((char *)buffer)[keylen + 3] = 0; | |
78 | ((char *)buffer)[keylen + 4] = 0; | |
79 | ||
80 | /* turn the raw key into something that can work with as a filename */ | |
81 | key = cachefiles_cook_key(buffer, keylen + 2, object->type); | |
82 | if (!key) | |
83 | goto nomem_key; | |
84 | ||
85 | /* get hold of the auxiliary data and prepend the object type */ | |
86 | auxdata = buffer; | |
402cb8dd DH |
87 | auxlen = cookie->aux_len; |
88 | if (auxlen) { | |
89 | if (auxlen <= sizeof(cookie->inline_aux)) | |
90 | p = cookie->inline_aux; | |
91 | else | |
92 | p = cookie->aux; | |
93 | memcpy(auxdata->data, p, auxlen); | |
9ae326a6 DH |
94 | } |
95 | ||
96 | auxdata->len = auxlen + 1; | |
402cb8dd | 97 | auxdata->type = cookie->type; |
9ae326a6 DH |
98 | |
99 | lookup_data->auxdata = auxdata; | |
100 | lookup_data->key = key; | |
101 | object->lookup_data = lookup_data; | |
102 | ||
103 | _leave(" = %p [%p]", &object->fscache, lookup_data); | |
104 | return &object->fscache; | |
105 | ||
106 | nomem_key: | |
107 | kfree(buffer); | |
108 | nomem_buffer: | |
109 | BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
110 | kmem_cache_free(cachefiles_object_jar, object); | |
111 | fscache_object_destroyed(&cache->cache); | |
112 | nomem_object: | |
113 | kfree(lookup_data); | |
114 | nomem_lookup_data: | |
115 | _leave(" = -ENOMEM"); | |
116 | return ERR_PTR(-ENOMEM); | |
117 | } | |
118 | ||
119 | /* | |
120 | * attempt to look up the nominated node in this cache | |
fee096de | 121 | * - return -ETIMEDOUT to be scheduled again |
9ae326a6 | 122 | */ |
fee096de | 123 | static int cachefiles_lookup_object(struct fscache_object *_object) |
9ae326a6 DH |
124 | { |
125 | struct cachefiles_lookup_data *lookup_data; | |
126 | struct cachefiles_object *parent, *object; | |
127 | struct cachefiles_cache *cache; | |
128 | const struct cred *saved_cred; | |
129 | int ret; | |
130 | ||
131 | _enter("{OBJ%x}", _object->debug_id); | |
132 | ||
133 | cache = container_of(_object->cache, struct cachefiles_cache, cache); | |
134 | parent = container_of(_object->parent, | |
135 | struct cachefiles_object, fscache); | |
136 | object = container_of(_object, struct cachefiles_object, fscache); | |
137 | lookup_data = object->lookup_data; | |
138 | ||
139 | ASSERTCMP(lookup_data, !=, NULL); | |
140 | ||
141 | /* look up the key, creating any missing bits */ | |
142 | cachefiles_begin_secure(cache, &saved_cred); | |
143 | ret = cachefiles_walk_to_object(parent, object, | |
144 | lookup_data->key, | |
145 | lookup_data->auxdata); | |
146 | cachefiles_end_secure(cache, saved_cred); | |
147 | ||
148 | /* polish off by setting the attributes of non-index files */ | |
149 | if (ret == 0 && | |
150 | object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) | |
151 | cachefiles_attr_changed(&object->fscache); | |
152 | ||
fee096de | 153 | if (ret < 0 && ret != -ETIMEDOUT) { |
14e69647 | 154 | if (ret != -ENOBUFS) |
0227d6ab | 155 | pr_warn("Lookup failed error %d\n", ret); |
9ae326a6 DH |
156 | fscache_object_lookup_error(&object->fscache); |
157 | } | |
158 | ||
159 | _leave(" [%d]", ret); | |
fee096de | 160 | return ret; |
9ae326a6 DH |
161 | } |
162 | ||
163 | /* | |
164 | * indication of lookup completion | |
165 | */ | |
166 | static void cachefiles_lookup_complete(struct fscache_object *_object) | |
167 | { | |
168 | struct cachefiles_object *object; | |
169 | ||
170 | object = container_of(_object, struct cachefiles_object, fscache); | |
171 | ||
172 | _enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data); | |
173 | ||
174 | if (object->lookup_data) { | |
175 | kfree(object->lookup_data->key); | |
176 | kfree(object->lookup_data->auxdata); | |
177 | kfree(object->lookup_data); | |
178 | object->lookup_data = NULL; | |
179 | } | |
180 | } | |
181 | ||
182 | /* | |
183 | * increment the usage count on an inode object (may fail if unmounting) | |
184 | */ | |
185 | static | |
a18feb55 DH |
186 | struct fscache_object *cachefiles_grab_object(struct fscache_object *_object, |
187 | enum fscache_obj_ref_trace why) | |
9ae326a6 DH |
188 | { |
189 | struct cachefiles_object *object = | |
190 | container_of(_object, struct cachefiles_object, fscache); | |
a18feb55 | 191 | int u; |
9ae326a6 DH |
192 | |
193 | _enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage)); | |
194 | ||
195 | #ifdef CACHEFILES_DEBUG_SLAB | |
196 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
197 | #endif | |
198 | ||
a18feb55 DH |
199 | u = atomic_inc_return(&object->usage); |
200 | trace_cachefiles_ref(object, _object->cookie, | |
201 | (enum cachefiles_obj_ref_trace)why, u); | |
9ae326a6 DH |
202 | return &object->fscache; |
203 | } | |
204 | ||
205 | /* | |
25985edc | 206 | * update the auxiliary data for an object object on disk |
9ae326a6 DH |
207 | */ |
208 | static void cachefiles_update_object(struct fscache_object *_object) | |
209 | { | |
210 | struct cachefiles_object *object; | |
211 | struct cachefiles_xattr *auxdata; | |
212 | struct cachefiles_cache *cache; | |
213 | struct fscache_cookie *cookie; | |
214 | const struct cred *saved_cred; | |
402cb8dd | 215 | const void *aux; |
9ae326a6 DH |
216 | unsigned auxlen; |
217 | ||
218 | _enter("{OBJ%x}", _object->debug_id); | |
219 | ||
220 | object = container_of(_object, struct cachefiles_object, fscache); | |
221 | cache = container_of(object->fscache.cache, struct cachefiles_cache, | |
222 | cache); | |
1362729b DH |
223 | |
224 | if (!fscache_use_cookie(_object)) { | |
225 | _leave(" [relinq]"); | |
226 | return; | |
227 | } | |
228 | ||
9ae326a6 | 229 | cookie = object->fscache.cookie; |
402cb8dd | 230 | auxlen = cookie->aux_len; |
9ae326a6 | 231 | |
402cb8dd | 232 | if (!auxlen) { |
1362729b | 233 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
234 | _leave(" [no aux]"); |
235 | return; | |
236 | } | |
237 | ||
402cb8dd | 238 | auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp); |
9ae326a6 | 239 | if (!auxdata) { |
1362729b | 240 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
241 | _leave(" [nomem]"); |
242 | return; | |
243 | } | |
244 | ||
402cb8dd DH |
245 | aux = (auxlen <= sizeof(cookie->inline_aux)) ? |
246 | cookie->inline_aux : cookie->aux; | |
247 | ||
248 | memcpy(auxdata->data, aux, auxlen); | |
1362729b | 249 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
250 | |
251 | auxdata->len = auxlen + 1; | |
402cb8dd | 252 | auxdata->type = cookie->type; |
9ae326a6 DH |
253 | |
254 | cachefiles_begin_secure(cache, &saved_cred); | |
255 | cachefiles_update_object_xattr(object, auxdata); | |
256 | cachefiles_end_secure(cache, saved_cred); | |
257 | kfree(auxdata); | |
258 | _leave(""); | |
259 | } | |
260 | ||
261 | /* | |
262 | * discard the resources pinned by an object and effect retirement if | |
263 | * requested | |
264 | */ | |
265 | static void cachefiles_drop_object(struct fscache_object *_object) | |
266 | { | |
267 | struct cachefiles_object *object; | |
268 | struct cachefiles_cache *cache; | |
269 | const struct cred *saved_cred; | |
a818101d DH |
270 | struct inode *inode; |
271 | blkcnt_t i_blocks = 0; | |
9ae326a6 DH |
272 | |
273 | ASSERT(_object); | |
274 | ||
275 | object = container_of(_object, struct cachefiles_object, fscache); | |
276 | ||
277 | _enter("{OBJ%x,%d}", | |
278 | object->fscache.debug_id, atomic_read(&object->usage)); | |
279 | ||
280 | cache = container_of(object->fscache.cache, | |
281 | struct cachefiles_cache, cache); | |
282 | ||
283 | #ifdef CACHEFILES_DEBUG_SLAB | |
284 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
285 | #endif | |
286 | ||
a3b7c004 DH |
287 | /* We need to tidy the object up if we did in fact manage to open it. |
288 | * It's possible for us to get here before the object is fully | |
289 | * initialised if the parent goes away or the object gets retired | |
290 | * before we set it up. | |
291 | */ | |
292 | if (object->dentry) { | |
293 | /* delete retired objects */ | |
294 | if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) && | |
295 | _object != cache->cache.fsdef | |
296 | ) { | |
297 | _debug("- retire object OBJ%x", object->fscache.debug_id); | |
a818101d DH |
298 | inode = d_backing_inode(object->dentry); |
299 | if (inode) | |
300 | i_blocks = inode->i_blocks; | |
301 | ||
a3b7c004 DH |
302 | cachefiles_begin_secure(cache, &saved_cred); |
303 | cachefiles_delete_object(cache, object); | |
304 | cachefiles_end_secure(cache, saved_cred); | |
305 | } | |
306 | ||
307 | /* close the filesystem stuff attached to the object */ | |
308 | if (object->backer != object->dentry) | |
309 | dput(object->backer); | |
310 | object->backer = NULL; | |
9ae326a6 DH |
311 | } |
312 | ||
9ae326a6 | 313 | /* note that the object is now inactive */ |
a5b3a80b | 314 | if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) |
a818101d | 315 | cachefiles_mark_object_inactive(cache, object, i_blocks); |
9ae326a6 DH |
316 | |
317 | dput(object->dentry); | |
318 | object->dentry = NULL; | |
319 | ||
320 | _leave(""); | |
321 | } | |
322 | ||
323 | /* | |
324 | * dispose of a reference to an object | |
325 | */ | |
a18feb55 DH |
326 | static void cachefiles_put_object(struct fscache_object *_object, |
327 | enum fscache_obj_ref_trace why) | |
9ae326a6 DH |
328 | { |
329 | struct cachefiles_object *object; | |
330 | struct fscache_cache *cache; | |
a18feb55 | 331 | int u; |
9ae326a6 DH |
332 | |
333 | ASSERT(_object); | |
334 | ||
335 | object = container_of(_object, struct cachefiles_object, fscache); | |
336 | ||
337 | _enter("{OBJ%x,%d}", | |
338 | object->fscache.debug_id, atomic_read(&object->usage)); | |
339 | ||
340 | #ifdef CACHEFILES_DEBUG_SLAB | |
341 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
342 | #endif | |
343 | ||
344 | ASSERTIFCMP(object->fscache.parent, | |
345 | object->fscache.parent->n_children, >, 0); | |
346 | ||
a18feb55 DH |
347 | u = atomic_dec_return(&object->usage); |
348 | trace_cachefiles_ref(object, _object->cookie, | |
349 | (enum cachefiles_obj_ref_trace)why, u); | |
350 | ASSERTCMP(u, !=, -1); | |
351 | if (u == 0) { | |
9ae326a6 DH |
352 | _debug("- kill object OBJ%x", object->fscache.debug_id); |
353 | ||
354 | ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
355 | ASSERTCMP(object->fscache.parent, ==, NULL); | |
356 | ASSERTCMP(object->backer, ==, NULL); | |
357 | ASSERTCMP(object->dentry, ==, NULL); | |
358 | ASSERTCMP(object->fscache.n_ops, ==, 0); | |
359 | ASSERTCMP(object->fscache.n_children, ==, 0); | |
360 | ||
361 | if (object->lookup_data) { | |
362 | kfree(object->lookup_data->key); | |
363 | kfree(object->lookup_data->auxdata); | |
364 | kfree(object->lookup_data); | |
365 | object->lookup_data = NULL; | |
366 | } | |
367 | ||
368 | cache = object->fscache.cache; | |
4fbf4291 | 369 | fscache_object_destroy(&object->fscache); |
9ae326a6 DH |
370 | kmem_cache_free(cachefiles_object_jar, object); |
371 | fscache_object_destroyed(cache); | |
372 | } | |
373 | ||
374 | _leave(""); | |
375 | } | |
376 | ||
377 | /* | |
378 | * sync a cache | |
379 | */ | |
380 | static void cachefiles_sync_cache(struct fscache_cache *_cache) | |
381 | { | |
382 | struct cachefiles_cache *cache; | |
383 | const struct cred *saved_cred; | |
384 | int ret; | |
385 | ||
386 | _enter("%p", _cache); | |
387 | ||
388 | cache = container_of(_cache, struct cachefiles_cache, cache); | |
389 | ||
390 | /* make sure all pages pinned by operations on behalf of the netfs are | |
391 | * written to disc */ | |
392 | cachefiles_begin_secure(cache, &saved_cred); | |
5af7926f | 393 | down_read(&cache->mnt->mnt_sb->s_umount); |
60b0680f | 394 | ret = sync_filesystem(cache->mnt->mnt_sb); |
5af7926f | 395 | up_read(&cache->mnt->mnt_sb->s_umount); |
9ae326a6 DH |
396 | cachefiles_end_secure(cache, saved_cred); |
397 | ||
398 | if (ret == -EIO) | |
399 | cachefiles_io_error(cache, | |
400 | "Attempt to sync backing fs superblock" | |
401 | " returned error %d", | |
402 | ret); | |
403 | } | |
404 | ||
5002d7be DH |
405 | /* |
406 | * check if the backing cache is updated to FS-Cache | |
407 | * - called by FS-Cache when evaluates if need to invalidate the cache | |
408 | */ | |
480ce08a | 409 | static int cachefiles_check_consistency(struct fscache_operation *op) |
5002d7be DH |
410 | { |
411 | struct cachefiles_object *object; | |
412 | struct cachefiles_cache *cache; | |
413 | const struct cred *saved_cred; | |
414 | int ret; | |
415 | ||
416 | _enter("{OBJ%x}", op->object->debug_id); | |
417 | ||
418 | object = container_of(op->object, struct cachefiles_object, fscache); | |
419 | cache = container_of(object->fscache.cache, | |
420 | struct cachefiles_cache, cache); | |
421 | ||
422 | cachefiles_begin_secure(cache, &saved_cred); | |
423 | ret = cachefiles_check_auxdata(object); | |
424 | cachefiles_end_secure(cache, saved_cred); | |
425 | ||
426 | _leave(" = %d", ret); | |
427 | return ret; | |
428 | } | |
429 | ||
9ae326a6 DH |
430 | /* |
431 | * notification the attributes on an object have changed | |
432 | * - called with reads/writes excluded by FS-Cache | |
433 | */ | |
434 | static int cachefiles_attr_changed(struct fscache_object *_object) | |
435 | { | |
436 | struct cachefiles_object *object; | |
437 | struct cachefiles_cache *cache; | |
438 | const struct cred *saved_cred; | |
439 | struct iattr newattrs; | |
440 | uint64_t ni_size; | |
441 | loff_t oi_size; | |
442 | int ret; | |
443 | ||
ee1235a9 | 444 | ni_size = _object->store_limit_l; |
9ae326a6 DH |
445 | |
446 | _enter("{OBJ%x},[%llu]", | |
447 | _object->debug_id, (unsigned long long) ni_size); | |
448 | ||
449 | object = container_of(_object, struct cachefiles_object, fscache); | |
450 | cache = container_of(object->fscache.cache, | |
451 | struct cachefiles_cache, cache); | |
452 | ||
453 | if (ni_size == object->i_size) | |
454 | return 0; | |
455 | ||
456 | if (!object->backer) | |
457 | return -ENOBUFS; | |
458 | ||
ce40fa78 | 459 | ASSERT(d_is_reg(object->backer)); |
9ae326a6 DH |
460 | |
461 | fscache_set_store_limit(&object->fscache, ni_size); | |
462 | ||
466b77bc | 463 | oi_size = i_size_read(d_backing_inode(object->backer)); |
9ae326a6 DH |
464 | if (oi_size == ni_size) |
465 | return 0; | |
466 | ||
9ae326a6 | 467 | cachefiles_begin_secure(cache, &saved_cred); |
5955102c | 468 | inode_lock(d_inode(object->backer)); |
a17754fb DH |
469 | |
470 | /* if there's an extension to a partial page at the end of the backing | |
471 | * file, we need to discard the partial page so that we pick up new | |
472 | * data after it */ | |
473 | if (oi_size & ~PAGE_MASK && ni_size > oi_size) { | |
474 | _debug("discard tail %llx", oi_size); | |
475 | newattrs.ia_valid = ATTR_SIZE; | |
476 | newattrs.ia_size = oi_size & PAGE_MASK; | |
27ac0ffe | 477 | ret = notify_change(object->backer, &newattrs, NULL); |
a17754fb DH |
478 | if (ret < 0) |
479 | goto truncate_failed; | |
480 | } | |
481 | ||
482 | newattrs.ia_valid = ATTR_SIZE; | |
483 | newattrs.ia_size = ni_size; | |
27ac0ffe | 484 | ret = notify_change(object->backer, &newattrs, NULL); |
a17754fb DH |
485 | |
486 | truncate_failed: | |
5955102c | 487 | inode_unlock(d_inode(object->backer)); |
9ae326a6 DH |
488 | cachefiles_end_secure(cache, saved_cred); |
489 | ||
490 | if (ret == -EIO) { | |
491 | fscache_set_store_limit(&object->fscache, 0); | |
492 | cachefiles_io_error_obj(object, "Size set failed"); | |
493 | ret = -ENOBUFS; | |
494 | } | |
495 | ||
496 | _leave(" = %d", ret); | |
497 | return ret; | |
498 | } | |
499 | ||
9dc8d9bf DH |
500 | /* |
501 | * Invalidate an object | |
502 | */ | |
503 | static void cachefiles_invalidate_object(struct fscache_operation *op) | |
504 | { | |
505 | struct cachefiles_object *object; | |
506 | struct cachefiles_cache *cache; | |
507 | const struct cred *saved_cred; | |
508 | struct path path; | |
509 | uint64_t ni_size; | |
510 | int ret; | |
511 | ||
512 | object = container_of(op->object, struct cachefiles_object, fscache); | |
513 | cache = container_of(object->fscache.cache, | |
514 | struct cachefiles_cache, cache); | |
515 | ||
ee1235a9 | 516 | ni_size = op->object->store_limit_l; |
9dc8d9bf DH |
517 | |
518 | _enter("{OBJ%x},[%llu]", | |
519 | op->object->debug_id, (unsigned long long)ni_size); | |
520 | ||
521 | if (object->backer) { | |
ce40fa78 | 522 | ASSERT(d_is_reg(object->backer)); |
9dc8d9bf DH |
523 | |
524 | fscache_set_store_limit(&object->fscache, ni_size); | |
525 | ||
526 | path.dentry = object->backer; | |
527 | path.mnt = cache->mnt; | |
528 | ||
529 | cachefiles_begin_secure(cache, &saved_cred); | |
530 | ret = vfs_truncate(&path, 0); | |
531 | if (ret == 0) | |
532 | ret = vfs_truncate(&path, ni_size); | |
533 | cachefiles_end_secure(cache, saved_cred); | |
534 | ||
535 | if (ret != 0) { | |
536 | fscache_set_store_limit(&object->fscache, 0); | |
537 | if (ret == -EIO) | |
538 | cachefiles_io_error_obj(object, | |
539 | "Invalidate failed"); | |
540 | } | |
541 | } | |
542 | ||
1f372dff | 543 | fscache_op_complete(op, true); |
9dc8d9bf DH |
544 | _leave(""); |
545 | } | |
546 | ||
9ae326a6 DH |
547 | /* |
548 | * dissociate a cache from all the pages it was backing | |
549 | */ | |
550 | static void cachefiles_dissociate_pages(struct fscache_cache *cache) | |
551 | { | |
552 | _enter(""); | |
553 | } | |
554 | ||
555 | const struct fscache_cache_ops cachefiles_cache_ops = { | |
556 | .name = "cachefiles", | |
557 | .alloc_object = cachefiles_alloc_object, | |
558 | .lookup_object = cachefiles_lookup_object, | |
559 | .lookup_complete = cachefiles_lookup_complete, | |
560 | .grab_object = cachefiles_grab_object, | |
561 | .update_object = cachefiles_update_object, | |
9dc8d9bf | 562 | .invalidate_object = cachefiles_invalidate_object, |
9ae326a6 DH |
563 | .drop_object = cachefiles_drop_object, |
564 | .put_object = cachefiles_put_object, | |
565 | .sync_cache = cachefiles_sync_cache, | |
566 | .attr_changed = cachefiles_attr_changed, | |
567 | .read_or_alloc_page = cachefiles_read_or_alloc_page, | |
568 | .read_or_alloc_pages = cachefiles_read_or_alloc_pages, | |
569 | .allocate_page = cachefiles_allocate_page, | |
570 | .allocate_pages = cachefiles_allocate_pages, | |
571 | .write_page = cachefiles_write_page, | |
572 | .uncache_page = cachefiles_uncache_page, | |
573 | .dissociate_pages = cachefiles_dissociate_pages, | |
5002d7be | 574 | .check_consistency = cachefiles_check_consistency, |
9ae326a6 | 575 | }; |