Commit | Line | Data |
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b4d0d230 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9ae326a6 DH |
2 | /* FS-Cache interface to CacheFiles |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
9ae326a6 DH |
6 | */ |
7 | ||
5a0e3ad6 | 8 | #include <linux/slab.h> |
9ae326a6 | 9 | #include <linux/mount.h> |
9ae326a6 DH |
10 | #include "internal.h" |
11 | ||
9ae326a6 DH |
12 | struct cachefiles_lookup_data { |
13 | struct cachefiles_xattr *auxdata; /* auxiliary data */ | |
14 | char *key; /* key path */ | |
15 | }; | |
16 | ||
17 | static int cachefiles_attr_changed(struct fscache_object *_object); | |
18 | ||
19 | /* | |
20 | * allocate an object record for a cookie lookup and prepare the lookup data | |
21 | */ | |
22 | static struct fscache_object *cachefiles_alloc_object( | |
23 | struct fscache_cache *_cache, | |
24 | struct fscache_cookie *cookie) | |
25 | { | |
26 | struct cachefiles_lookup_data *lookup_data; | |
27 | struct cachefiles_object *object; | |
28 | struct cachefiles_cache *cache; | |
29 | struct cachefiles_xattr *auxdata; | |
30 | unsigned keylen, auxlen; | |
402cb8dd | 31 | void *buffer, *p; |
9ae326a6 DH |
32 | char *key; |
33 | ||
34 | cache = container_of(_cache, struct cachefiles_cache, cache); | |
35 | ||
8beabdde | 36 | _enter("{%s},%x,", cache->cache.identifier, cookie->debug_id); |
9ae326a6 | 37 | |
5f4f9f4a | 38 | lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp); |
9ae326a6 DH |
39 | if (!lookup_data) |
40 | goto nomem_lookup_data; | |
41 | ||
42 | /* create a new object record and a temporary leaf image */ | |
5f4f9f4a | 43 | object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp); |
9ae326a6 DH |
44 | if (!object) |
45 | goto nomem_object; | |
46 | ||
47 | ASSERTCMP(object->backer, ==, NULL); | |
48 | ||
49 | BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
50 | atomic_set(&object->usage, 1); | |
51 | ||
52 | fscache_object_init(&object->fscache, cookie, &cache->cache); | |
53 | ||
54 | object->type = cookie->def->type; | |
55 | ||
56 | /* get hold of the raw key | |
57 | * - stick the length on the front and leave space on the back for the | |
58 | * encoder | |
59 | */ | |
5f4f9f4a | 60 | buffer = kmalloc((2 + 512) + 3, cachefiles_gfp); |
9ae326a6 DH |
61 | if (!buffer) |
62 | goto nomem_buffer; | |
63 | ||
402cb8dd DH |
64 | keylen = cookie->key_len; |
65 | if (keylen <= sizeof(cookie->inline_key)) | |
66 | p = cookie->inline_key; | |
67 | else | |
68 | p = cookie->key; | |
69 | memcpy(buffer + 2, p, keylen); | |
9ae326a6 DH |
70 | |
71 | *(uint16_t *)buffer = keylen; | |
72 | ((char *)buffer)[keylen + 2] = 0; | |
73 | ((char *)buffer)[keylen + 3] = 0; | |
74 | ((char *)buffer)[keylen + 4] = 0; | |
75 | ||
76 | /* turn the raw key into something that can work with as a filename */ | |
77 | key = cachefiles_cook_key(buffer, keylen + 2, object->type); | |
78 | if (!key) | |
79 | goto nomem_key; | |
80 | ||
81 | /* get hold of the auxiliary data and prepend the object type */ | |
82 | auxdata = buffer; | |
402cb8dd DH |
83 | auxlen = cookie->aux_len; |
84 | if (auxlen) { | |
85 | if (auxlen <= sizeof(cookie->inline_aux)) | |
86 | p = cookie->inline_aux; | |
87 | else | |
88 | p = cookie->aux; | |
89 | memcpy(auxdata->data, p, auxlen); | |
9ae326a6 DH |
90 | } |
91 | ||
92 | auxdata->len = auxlen + 1; | |
402cb8dd | 93 | auxdata->type = cookie->type; |
9ae326a6 DH |
94 | |
95 | lookup_data->auxdata = auxdata; | |
96 | lookup_data->key = key; | |
97 | object->lookup_data = lookup_data; | |
98 | ||
8beabdde | 99 | _leave(" = %x [%p]", object->fscache.debug_id, lookup_data); |
9ae326a6 DH |
100 | return &object->fscache; |
101 | ||
102 | nomem_key: | |
103 | kfree(buffer); | |
104 | nomem_buffer: | |
105 | BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
106 | kmem_cache_free(cachefiles_object_jar, object); | |
107 | fscache_object_destroyed(&cache->cache); | |
108 | nomem_object: | |
109 | kfree(lookup_data); | |
110 | nomem_lookup_data: | |
111 | _leave(" = -ENOMEM"); | |
112 | return ERR_PTR(-ENOMEM); | |
113 | } | |
114 | ||
115 | /* | |
116 | * attempt to look up the nominated node in this cache | |
fee096de | 117 | * - return -ETIMEDOUT to be scheduled again |
9ae326a6 | 118 | */ |
fee096de | 119 | static int cachefiles_lookup_object(struct fscache_object *_object) |
9ae326a6 DH |
120 | { |
121 | struct cachefiles_lookup_data *lookup_data; | |
122 | struct cachefiles_object *parent, *object; | |
123 | struct cachefiles_cache *cache; | |
124 | const struct cred *saved_cred; | |
125 | int ret; | |
126 | ||
127 | _enter("{OBJ%x}", _object->debug_id); | |
128 | ||
129 | cache = container_of(_object->cache, struct cachefiles_cache, cache); | |
130 | parent = container_of(_object->parent, | |
131 | struct cachefiles_object, fscache); | |
132 | object = container_of(_object, struct cachefiles_object, fscache); | |
133 | lookup_data = object->lookup_data; | |
134 | ||
135 | ASSERTCMP(lookup_data, !=, NULL); | |
136 | ||
137 | /* look up the key, creating any missing bits */ | |
138 | cachefiles_begin_secure(cache, &saved_cred); | |
139 | ret = cachefiles_walk_to_object(parent, object, | |
140 | lookup_data->key, | |
141 | lookup_data->auxdata); | |
142 | cachefiles_end_secure(cache, saved_cred); | |
143 | ||
144 | /* polish off by setting the attributes of non-index files */ | |
145 | if (ret == 0 && | |
146 | object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) | |
147 | cachefiles_attr_changed(&object->fscache); | |
148 | ||
fee096de | 149 | if (ret < 0 && ret != -ETIMEDOUT) { |
14e69647 | 150 | if (ret != -ENOBUFS) |
0227d6ab | 151 | pr_warn("Lookup failed error %d\n", ret); |
9ae326a6 DH |
152 | fscache_object_lookup_error(&object->fscache); |
153 | } | |
154 | ||
155 | _leave(" [%d]", ret); | |
fee096de | 156 | return ret; |
9ae326a6 DH |
157 | } |
158 | ||
159 | /* | |
160 | * indication of lookup completion | |
161 | */ | |
162 | static void cachefiles_lookup_complete(struct fscache_object *_object) | |
163 | { | |
164 | struct cachefiles_object *object; | |
165 | ||
166 | object = container_of(_object, struct cachefiles_object, fscache); | |
167 | ||
168 | _enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data); | |
169 | ||
170 | if (object->lookup_data) { | |
171 | kfree(object->lookup_data->key); | |
172 | kfree(object->lookup_data->auxdata); | |
173 | kfree(object->lookup_data); | |
174 | object->lookup_data = NULL; | |
175 | } | |
176 | } | |
177 | ||
178 | /* | |
179 | * increment the usage count on an inode object (may fail if unmounting) | |
180 | */ | |
181 | static | |
a18feb55 DH |
182 | struct fscache_object *cachefiles_grab_object(struct fscache_object *_object, |
183 | enum fscache_obj_ref_trace why) | |
9ae326a6 DH |
184 | { |
185 | struct cachefiles_object *object = | |
186 | container_of(_object, struct cachefiles_object, fscache); | |
a18feb55 | 187 | int u; |
9ae326a6 DH |
188 | |
189 | _enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage)); | |
190 | ||
191 | #ifdef CACHEFILES_DEBUG_SLAB | |
192 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
193 | #endif | |
194 | ||
a18feb55 DH |
195 | u = atomic_inc_return(&object->usage); |
196 | trace_cachefiles_ref(object, _object->cookie, | |
197 | (enum cachefiles_obj_ref_trace)why, u); | |
9ae326a6 DH |
198 | return &object->fscache; |
199 | } | |
200 | ||
201 | /* | |
25985edc | 202 | * update the auxiliary data for an object object on disk |
9ae326a6 DH |
203 | */ |
204 | static void cachefiles_update_object(struct fscache_object *_object) | |
205 | { | |
206 | struct cachefiles_object *object; | |
207 | struct cachefiles_xattr *auxdata; | |
208 | struct cachefiles_cache *cache; | |
209 | struct fscache_cookie *cookie; | |
210 | const struct cred *saved_cred; | |
402cb8dd | 211 | const void *aux; |
9ae326a6 DH |
212 | unsigned auxlen; |
213 | ||
214 | _enter("{OBJ%x}", _object->debug_id); | |
215 | ||
216 | object = container_of(_object, struct cachefiles_object, fscache); | |
217 | cache = container_of(object->fscache.cache, struct cachefiles_cache, | |
218 | cache); | |
1362729b DH |
219 | |
220 | if (!fscache_use_cookie(_object)) { | |
221 | _leave(" [relinq]"); | |
222 | return; | |
223 | } | |
224 | ||
9ae326a6 | 225 | cookie = object->fscache.cookie; |
402cb8dd | 226 | auxlen = cookie->aux_len; |
9ae326a6 | 227 | |
402cb8dd | 228 | if (!auxlen) { |
1362729b | 229 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
230 | _leave(" [no aux]"); |
231 | return; | |
232 | } | |
233 | ||
402cb8dd | 234 | auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp); |
9ae326a6 | 235 | if (!auxdata) { |
1362729b | 236 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
237 | _leave(" [nomem]"); |
238 | return; | |
239 | } | |
240 | ||
402cb8dd DH |
241 | aux = (auxlen <= sizeof(cookie->inline_aux)) ? |
242 | cookie->inline_aux : cookie->aux; | |
243 | ||
244 | memcpy(auxdata->data, aux, auxlen); | |
1362729b | 245 | fscache_unuse_cookie(_object); |
9ae326a6 DH |
246 | |
247 | auxdata->len = auxlen + 1; | |
402cb8dd | 248 | auxdata->type = cookie->type; |
9ae326a6 DH |
249 | |
250 | cachefiles_begin_secure(cache, &saved_cred); | |
251 | cachefiles_update_object_xattr(object, auxdata); | |
252 | cachefiles_end_secure(cache, saved_cred); | |
253 | kfree(auxdata); | |
254 | _leave(""); | |
255 | } | |
256 | ||
257 | /* | |
258 | * discard the resources pinned by an object and effect retirement if | |
259 | * requested | |
260 | */ | |
261 | static void cachefiles_drop_object(struct fscache_object *_object) | |
262 | { | |
263 | struct cachefiles_object *object; | |
264 | struct cachefiles_cache *cache; | |
265 | const struct cred *saved_cred; | |
a818101d DH |
266 | struct inode *inode; |
267 | blkcnt_t i_blocks = 0; | |
9ae326a6 DH |
268 | |
269 | ASSERT(_object); | |
270 | ||
271 | object = container_of(_object, struct cachefiles_object, fscache); | |
272 | ||
273 | _enter("{OBJ%x,%d}", | |
274 | object->fscache.debug_id, atomic_read(&object->usage)); | |
275 | ||
276 | cache = container_of(object->fscache.cache, | |
277 | struct cachefiles_cache, cache); | |
278 | ||
279 | #ifdef CACHEFILES_DEBUG_SLAB | |
280 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
281 | #endif | |
282 | ||
a3b7c004 DH |
283 | /* We need to tidy the object up if we did in fact manage to open it. |
284 | * It's possible for us to get here before the object is fully | |
285 | * initialised if the parent goes away or the object gets retired | |
286 | * before we set it up. | |
287 | */ | |
288 | if (object->dentry) { | |
289 | /* delete retired objects */ | |
290 | if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) && | |
291 | _object != cache->cache.fsdef | |
292 | ) { | |
293 | _debug("- retire object OBJ%x", object->fscache.debug_id); | |
a818101d DH |
294 | inode = d_backing_inode(object->dentry); |
295 | if (inode) | |
296 | i_blocks = inode->i_blocks; | |
297 | ||
a3b7c004 DH |
298 | cachefiles_begin_secure(cache, &saved_cred); |
299 | cachefiles_delete_object(cache, object); | |
300 | cachefiles_end_secure(cache, saved_cred); | |
301 | } | |
302 | ||
303 | /* close the filesystem stuff attached to the object */ | |
304 | if (object->backer != object->dentry) | |
305 | dput(object->backer); | |
306 | object->backer = NULL; | |
9ae326a6 DH |
307 | } |
308 | ||
9ae326a6 | 309 | /* note that the object is now inactive */ |
a5b3a80b | 310 | if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) |
a818101d | 311 | cachefiles_mark_object_inactive(cache, object, i_blocks); |
9ae326a6 DH |
312 | |
313 | dput(object->dentry); | |
314 | object->dentry = NULL; | |
315 | ||
316 | _leave(""); | |
317 | } | |
318 | ||
319 | /* | |
320 | * dispose of a reference to an object | |
321 | */ | |
26aaeffc DH |
322 | void cachefiles_put_object(struct fscache_object *_object, |
323 | enum fscache_obj_ref_trace why) | |
9ae326a6 DH |
324 | { |
325 | struct cachefiles_object *object; | |
326 | struct fscache_cache *cache; | |
a18feb55 | 327 | int u; |
9ae326a6 DH |
328 | |
329 | ASSERT(_object); | |
330 | ||
331 | object = container_of(_object, struct cachefiles_object, fscache); | |
332 | ||
333 | _enter("{OBJ%x,%d}", | |
334 | object->fscache.debug_id, atomic_read(&object->usage)); | |
335 | ||
336 | #ifdef CACHEFILES_DEBUG_SLAB | |
337 | ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000); | |
338 | #endif | |
339 | ||
340 | ASSERTIFCMP(object->fscache.parent, | |
341 | object->fscache.parent->n_children, >, 0); | |
342 | ||
a18feb55 DH |
343 | u = atomic_dec_return(&object->usage); |
344 | trace_cachefiles_ref(object, _object->cookie, | |
345 | (enum cachefiles_obj_ref_trace)why, u); | |
346 | ASSERTCMP(u, !=, -1); | |
347 | if (u == 0) { | |
9ae326a6 DH |
348 | _debug("- kill object OBJ%x", object->fscache.debug_id); |
349 | ||
350 | ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)); | |
351 | ASSERTCMP(object->fscache.parent, ==, NULL); | |
352 | ASSERTCMP(object->backer, ==, NULL); | |
353 | ASSERTCMP(object->dentry, ==, NULL); | |
354 | ASSERTCMP(object->fscache.n_ops, ==, 0); | |
355 | ASSERTCMP(object->fscache.n_children, ==, 0); | |
356 | ||
357 | if (object->lookup_data) { | |
358 | kfree(object->lookup_data->key); | |
359 | kfree(object->lookup_data->auxdata); | |
360 | kfree(object->lookup_data); | |
361 | object->lookup_data = NULL; | |
362 | } | |
363 | ||
364 | cache = object->fscache.cache; | |
4fbf4291 | 365 | fscache_object_destroy(&object->fscache); |
9ae326a6 DH |
366 | kmem_cache_free(cachefiles_object_jar, object); |
367 | fscache_object_destroyed(cache); | |
368 | } | |
369 | ||
370 | _leave(""); | |
371 | } | |
372 | ||
373 | /* | |
374 | * sync a cache | |
375 | */ | |
376 | static void cachefiles_sync_cache(struct fscache_cache *_cache) | |
377 | { | |
378 | struct cachefiles_cache *cache; | |
379 | const struct cred *saved_cred; | |
380 | int ret; | |
381 | ||
8beabdde | 382 | _enter("%s", _cache->tag->name); |
9ae326a6 DH |
383 | |
384 | cache = container_of(_cache, struct cachefiles_cache, cache); | |
385 | ||
386 | /* make sure all pages pinned by operations on behalf of the netfs are | |
387 | * written to disc */ | |
388 | cachefiles_begin_secure(cache, &saved_cred); | |
5af7926f | 389 | down_read(&cache->mnt->mnt_sb->s_umount); |
60b0680f | 390 | ret = sync_filesystem(cache->mnt->mnt_sb); |
5af7926f | 391 | up_read(&cache->mnt->mnt_sb->s_umount); |
9ae326a6 DH |
392 | cachefiles_end_secure(cache, saved_cred); |
393 | ||
394 | if (ret == -EIO) | |
395 | cachefiles_io_error(cache, | |
396 | "Attempt to sync backing fs superblock" | |
397 | " returned error %d", | |
398 | ret); | |
399 | } | |
400 | ||
5002d7be DH |
401 | /* |
402 | * check if the backing cache is updated to FS-Cache | |
403 | * - called by FS-Cache when evaluates if need to invalidate the cache | |
404 | */ | |
480ce08a | 405 | static int cachefiles_check_consistency(struct fscache_operation *op) |
5002d7be DH |
406 | { |
407 | struct cachefiles_object *object; | |
408 | struct cachefiles_cache *cache; | |
409 | const struct cred *saved_cred; | |
410 | int ret; | |
411 | ||
412 | _enter("{OBJ%x}", op->object->debug_id); | |
413 | ||
414 | object = container_of(op->object, struct cachefiles_object, fscache); | |
415 | cache = container_of(object->fscache.cache, | |
416 | struct cachefiles_cache, cache); | |
417 | ||
418 | cachefiles_begin_secure(cache, &saved_cred); | |
419 | ret = cachefiles_check_auxdata(object); | |
420 | cachefiles_end_secure(cache, saved_cred); | |
421 | ||
422 | _leave(" = %d", ret); | |
423 | return ret; | |
424 | } | |
425 | ||
9ae326a6 DH |
426 | /* |
427 | * notification the attributes on an object have changed | |
428 | * - called with reads/writes excluded by FS-Cache | |
429 | */ | |
430 | static int cachefiles_attr_changed(struct fscache_object *_object) | |
431 | { | |
432 | struct cachefiles_object *object; | |
433 | struct cachefiles_cache *cache; | |
434 | const struct cred *saved_cred; | |
435 | struct iattr newattrs; | |
436 | uint64_t ni_size; | |
437 | loff_t oi_size; | |
438 | int ret; | |
439 | ||
ee1235a9 | 440 | ni_size = _object->store_limit_l; |
9ae326a6 DH |
441 | |
442 | _enter("{OBJ%x},[%llu]", | |
443 | _object->debug_id, (unsigned long long) ni_size); | |
444 | ||
445 | object = container_of(_object, struct cachefiles_object, fscache); | |
446 | cache = container_of(object->fscache.cache, | |
447 | struct cachefiles_cache, cache); | |
448 | ||
449 | if (ni_size == object->i_size) | |
450 | return 0; | |
451 | ||
452 | if (!object->backer) | |
453 | return -ENOBUFS; | |
454 | ||
ce40fa78 | 455 | ASSERT(d_is_reg(object->backer)); |
9ae326a6 DH |
456 | |
457 | fscache_set_store_limit(&object->fscache, ni_size); | |
458 | ||
466b77bc | 459 | oi_size = i_size_read(d_backing_inode(object->backer)); |
9ae326a6 DH |
460 | if (oi_size == ni_size) |
461 | return 0; | |
462 | ||
9ae326a6 | 463 | cachefiles_begin_secure(cache, &saved_cred); |
5955102c | 464 | inode_lock(d_inode(object->backer)); |
a17754fb DH |
465 | |
466 | /* if there's an extension to a partial page at the end of the backing | |
467 | * file, we need to discard the partial page so that we pick up new | |
468 | * data after it */ | |
469 | if (oi_size & ~PAGE_MASK && ni_size > oi_size) { | |
470 | _debug("discard tail %llx", oi_size); | |
471 | newattrs.ia_valid = ATTR_SIZE; | |
472 | newattrs.ia_size = oi_size & PAGE_MASK; | |
2f221d6f | 473 | ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL); |
a17754fb DH |
474 | if (ret < 0) |
475 | goto truncate_failed; | |
476 | } | |
477 | ||
478 | newattrs.ia_valid = ATTR_SIZE; | |
479 | newattrs.ia_size = ni_size; | |
2f221d6f | 480 | ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL); |
a17754fb DH |
481 | |
482 | truncate_failed: | |
5955102c | 483 | inode_unlock(d_inode(object->backer)); |
9ae326a6 DH |
484 | cachefiles_end_secure(cache, saved_cred); |
485 | ||
486 | if (ret == -EIO) { | |
487 | fscache_set_store_limit(&object->fscache, 0); | |
488 | cachefiles_io_error_obj(object, "Size set failed"); | |
489 | ret = -ENOBUFS; | |
490 | } | |
491 | ||
492 | _leave(" = %d", ret); | |
493 | return ret; | |
494 | } | |
495 | ||
9dc8d9bf DH |
496 | /* |
497 | * Invalidate an object | |
498 | */ | |
499 | static void cachefiles_invalidate_object(struct fscache_operation *op) | |
500 | { | |
501 | struct cachefiles_object *object; | |
502 | struct cachefiles_cache *cache; | |
503 | const struct cred *saved_cred; | |
504 | struct path path; | |
505 | uint64_t ni_size; | |
506 | int ret; | |
507 | ||
508 | object = container_of(op->object, struct cachefiles_object, fscache); | |
509 | cache = container_of(object->fscache.cache, | |
510 | struct cachefiles_cache, cache); | |
511 | ||
ee1235a9 | 512 | ni_size = op->object->store_limit_l; |
9dc8d9bf DH |
513 | |
514 | _enter("{OBJ%x},[%llu]", | |
515 | op->object->debug_id, (unsigned long long)ni_size); | |
516 | ||
517 | if (object->backer) { | |
ce40fa78 | 518 | ASSERT(d_is_reg(object->backer)); |
9dc8d9bf DH |
519 | |
520 | fscache_set_store_limit(&object->fscache, ni_size); | |
521 | ||
522 | path.dentry = object->backer; | |
523 | path.mnt = cache->mnt; | |
524 | ||
525 | cachefiles_begin_secure(cache, &saved_cred); | |
526 | ret = vfs_truncate(&path, 0); | |
527 | if (ret == 0) | |
528 | ret = vfs_truncate(&path, ni_size); | |
529 | cachefiles_end_secure(cache, saved_cred); | |
530 | ||
531 | if (ret != 0) { | |
532 | fscache_set_store_limit(&object->fscache, 0); | |
533 | if (ret == -EIO) | |
534 | cachefiles_io_error_obj(object, | |
535 | "Invalidate failed"); | |
536 | } | |
537 | } | |
538 | ||
1f372dff | 539 | fscache_op_complete(op, true); |
9dc8d9bf DH |
540 | _leave(""); |
541 | } | |
542 | ||
9ae326a6 DH |
543 | /* |
544 | * dissociate a cache from all the pages it was backing | |
545 | */ | |
546 | static void cachefiles_dissociate_pages(struct fscache_cache *cache) | |
547 | { | |
548 | _enter(""); | |
549 | } | |
550 | ||
551 | const struct fscache_cache_ops cachefiles_cache_ops = { | |
552 | .name = "cachefiles", | |
553 | .alloc_object = cachefiles_alloc_object, | |
554 | .lookup_object = cachefiles_lookup_object, | |
555 | .lookup_complete = cachefiles_lookup_complete, | |
556 | .grab_object = cachefiles_grab_object, | |
557 | .update_object = cachefiles_update_object, | |
9dc8d9bf | 558 | .invalidate_object = cachefiles_invalidate_object, |
9ae326a6 DH |
559 | .drop_object = cachefiles_drop_object, |
560 | .put_object = cachefiles_put_object, | |
561 | .sync_cache = cachefiles_sync_cache, | |
562 | .attr_changed = cachefiles_attr_changed, | |
563 | .read_or_alloc_page = cachefiles_read_or_alloc_page, | |
564 | .read_or_alloc_pages = cachefiles_read_or_alloc_pages, | |
565 | .allocate_page = cachefiles_allocate_page, | |
566 | .allocate_pages = cachefiles_allocate_pages, | |
567 | .write_page = cachefiles_write_page, | |
568 | .uncache_page = cachefiles_uncache_page, | |
569 | .dissociate_pages = cachefiles_dissociate_pages, | |
5002d7be | 570 | .check_consistency = cachefiles_check_consistency, |
26aaeffc | 571 | .begin_read_operation = cachefiles_begin_read_operation, |
9ae326a6 | 572 | }; |