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