^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* FS-Cache interface to CacheFiles
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) struct cachefiles_lookup_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) struct cachefiles_xattr *auxdata; /* auxiliary data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) char *key; /* key path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static int cachefiles_attr_changed(struct fscache_object *_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * allocate an object record for a cookie lookup and prepare the lookup data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct fscache_object *cachefiles_alloc_object(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct fscache_cache *_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct fscache_cookie *cookie)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct cachefiles_lookup_data *lookup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct cachefiles_xattr *auxdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned keylen, auxlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) void *buffer, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) char *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) cache = container_of(_cache, struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) _enter("{%s},%p,", cache->cache.identifier, cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (!lookup_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) goto nomem_lookup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /* create a new object record and a temporary leaf image */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) goto nomem_object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ASSERTCMP(object->backer, ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) atomic_set(&object->usage, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) fscache_object_init(&object->fscache, cookie, &cache->cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) object->type = cookie->def->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* get hold of the raw key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * - stick the length on the front and leave space on the back for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * encoder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) buffer = kmalloc((2 + 512) + 3, cachefiles_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto nomem_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) keylen = cookie->key_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (keylen <= sizeof(cookie->inline_key))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) p = cookie->inline_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) p = cookie->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) memcpy(buffer + 2, p, keylen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) *(uint16_t *)buffer = keylen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ((char *)buffer)[keylen + 2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) ((char *)buffer)[keylen + 3] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ((char *)buffer)[keylen + 4] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* turn the raw key into something that can work with as a filename */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) key = cachefiles_cook_key(buffer, keylen + 2, object->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (!key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) goto nomem_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* get hold of the auxiliary data and prepend the object type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) auxdata = buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) auxlen = cookie->aux_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (auxlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (auxlen <= sizeof(cookie->inline_aux))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) p = cookie->inline_aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) p = cookie->aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) memcpy(auxdata->data, p, auxlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) auxdata->len = auxlen + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) auxdata->type = cookie->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) lookup_data->auxdata = auxdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) lookup_data->key = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) object->lookup_data = lookup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) _leave(" = %p [%p]", &object->fscache, lookup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return &object->fscache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) nomem_key:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) nomem_buffer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kmem_cache_free(cachefiles_object_jar, object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) fscache_object_destroyed(&cache->cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) nomem_object:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) kfree(lookup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) nomem_lookup_data:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) _leave(" = -ENOMEM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * attempt to look up the nominated node in this cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * - return -ETIMEDOUT to be scheduled again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int cachefiles_lookup_object(struct fscache_object *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct cachefiles_lookup_data *lookup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct cachefiles_object *parent, *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) _enter("{OBJ%x}", _object->debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) cache = container_of(_object->cache, struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) parent = container_of(_object->parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) lookup_data = object->lookup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) ASSERTCMP(lookup_data, !=, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* look up the key, creating any missing bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = cachefiles_walk_to_object(parent, object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) lookup_data->key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) lookup_data->auxdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /* polish off by setting the attributes of non-index files */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (ret == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) cachefiles_attr_changed(&object->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (ret < 0 && ret != -ETIMEDOUT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (ret != -ENOBUFS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) pr_warn("Lookup failed error %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) fscache_object_lookup_error(&object->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) _leave(" [%d]", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * indication of lookup completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static void cachefiles_lookup_complete(struct fscache_object *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) _enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (object->lookup_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) kfree(object->lookup_data->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) kfree(object->lookup_data->auxdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) kfree(object->lookup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) object->lookup_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * increment the usage count on an inode object (may fail if unmounting)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct fscache_object *cachefiles_grab_object(struct fscache_object *_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) enum fscache_obj_ref_trace why)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct cachefiles_object *object =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) _enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #ifdef CACHEFILES_DEBUG_SLAB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) u = atomic_inc_return(&object->usage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) trace_cachefiles_ref(object, _object->cookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) (enum cachefiles_obj_ref_trace)why, u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return &object->fscache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * update the auxiliary data for an object object on disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static void cachefiles_update_object(struct fscache_object *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct cachefiles_xattr *auxdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct fscache_cookie *cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) const void *aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) unsigned auxlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) _enter("{OBJ%x}", _object->debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) cache = container_of(object->fscache.cache, struct cachefiles_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (!fscache_use_cookie(_object)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) _leave(" [relinq]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) cookie = object->fscache.cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) auxlen = cookie->aux_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!auxlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) fscache_unuse_cookie(_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) _leave(" [no aux]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (!auxdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) fscache_unuse_cookie(_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) _leave(" [nomem]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) aux = (auxlen <= sizeof(cookie->inline_aux)) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) cookie->inline_aux : cookie->aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) memcpy(auxdata->data, aux, auxlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) fscache_unuse_cookie(_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) auxdata->len = auxlen + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) auxdata->type = cookie->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) cachefiles_update_object_xattr(object, auxdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) kfree(auxdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * discard the resources pinned by an object and effect retirement if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * requested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static void cachefiles_drop_object(struct fscache_object *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) blkcnt_t i_blocks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) ASSERT(_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) _enter("{OBJ%x,%d}",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) object->fscache.debug_id, atomic_read(&object->usage));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) cache = container_of(object->fscache.cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) #ifdef CACHEFILES_DEBUG_SLAB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /* We need to tidy the object up if we did in fact manage to open it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * It's possible for us to get here before the object is fully
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * initialised if the parent goes away or the object gets retired
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * before we set it up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (object->dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* delete retired objects */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) _object != cache->cache.fsdef
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) _debug("- retire object OBJ%x", object->fscache.debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) inode = d_backing_inode(object->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) i_blocks = inode->i_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) cachefiles_delete_object(cache, object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /* close the filesystem stuff attached to the object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (object->backer != object->dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) dput(object->backer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) object->backer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* note that the object is now inactive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) cachefiles_mark_object_inactive(cache, object, i_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) dput(object->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) object->dentry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * dispose of a reference to an object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) static void cachefiles_put_object(struct fscache_object *_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) enum fscache_obj_ref_trace why)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct fscache_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) int u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ASSERT(_object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) _enter("{OBJ%x,%d}",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) object->fscache.debug_id, atomic_read(&object->usage));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) #ifdef CACHEFILES_DEBUG_SLAB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) ASSERTIFCMP(object->fscache.parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) object->fscache.parent->n_children, >, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) u = atomic_dec_return(&object->usage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) trace_cachefiles_ref(object, _object->cookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) (enum cachefiles_obj_ref_trace)why, u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) ASSERTCMP(u, !=, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (u == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) _debug("- kill object OBJ%x", object->fscache.debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) ASSERTCMP(object->fscache.parent, ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ASSERTCMP(object->backer, ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ASSERTCMP(object->dentry, ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) ASSERTCMP(object->fscache.n_ops, ==, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ASSERTCMP(object->fscache.n_children, ==, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (object->lookup_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) kfree(object->lookup_data->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) kfree(object->lookup_data->auxdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) kfree(object->lookup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) object->lookup_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) cache = object->fscache.cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) fscache_object_destroy(&object->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) kmem_cache_free(cachefiles_object_jar, object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) fscache_object_destroyed(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * sync a cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static void cachefiles_sync_cache(struct fscache_cache *_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) _enter("%p", _cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) cache = container_of(_cache, struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /* make sure all pages pinned by operations on behalf of the netfs are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * written to disc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) down_read(&cache->mnt->mnt_sb->s_umount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) ret = sync_filesystem(cache->mnt->mnt_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) up_read(&cache->mnt->mnt_sb->s_umount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (ret == -EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) cachefiles_io_error(cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) "Attempt to sync backing fs superblock"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) " returned error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * check if the backing cache is updated to FS-Cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * - called by FS-Cache when evaluates if need to invalidate the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) static int cachefiles_check_consistency(struct fscache_operation *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) _enter("{OBJ%x}", op->object->debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) object = container_of(op->object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) cache = container_of(object->fscache.cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) ret = cachefiles_check_auxdata(object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * notification the attributes on an object have changed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * - called with reads/writes excluded by FS-Cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) static int cachefiles_attr_changed(struct fscache_object *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) struct iattr newattrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) uint64_t ni_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) loff_t oi_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) ni_size = _object->store_limit_l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) _enter("{OBJ%x},[%llu]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) _object->debug_id, (unsigned long long) ni_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) object = container_of(_object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) cache = container_of(object->fscache.cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (ni_size == object->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (!object->backer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) ASSERT(d_is_reg(object->backer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) fscache_set_store_limit(&object->fscache, ni_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) oi_size = i_size_read(d_backing_inode(object->backer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (oi_size == ni_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) inode_lock(d_inode(object->backer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /* if there's an extension to a partial page at the end of the backing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * file, we need to discard the partial page so that we pick up new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * data after it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) _debug("discard tail %llx", oi_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) newattrs.ia_valid = ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) newattrs.ia_size = oi_size & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) ret = notify_change(object->backer, &newattrs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) goto truncate_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) newattrs.ia_valid = ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) newattrs.ia_size = ni_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) ret = notify_change(object->backer, &newattrs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) truncate_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) inode_unlock(d_inode(object->backer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (ret == -EIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) fscache_set_store_limit(&object->fscache, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) cachefiles_io_error_obj(object, "Size set failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) ret = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * Invalidate an object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) static void cachefiles_invalidate_object(struct fscache_operation *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) struct cachefiles_object *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) struct cachefiles_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) uint64_t ni_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) object = container_of(op->object, struct cachefiles_object, fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) cache = container_of(object->fscache.cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct cachefiles_cache, cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ni_size = op->object->store_limit_l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) _enter("{OBJ%x},[%llu]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) op->object->debug_id, (unsigned long long)ni_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (object->backer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) ASSERT(d_is_reg(object->backer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) fscache_set_store_limit(&object->fscache, ni_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) path.dentry = object->backer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) path.mnt = cache->mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) ret = vfs_truncate(&path, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) ret = vfs_truncate(&path, ni_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) fscache_set_store_limit(&object->fscache, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (ret == -EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) cachefiles_io_error_obj(object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) "Invalidate failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) fscache_op_complete(op, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * dissociate a cache from all the pages it was backing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) static void cachefiles_dissociate_pages(struct fscache_cache *cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) _enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) const struct fscache_cache_ops cachefiles_cache_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) .name = "cachefiles",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) .alloc_object = cachefiles_alloc_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) .lookup_object = cachefiles_lookup_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) .lookup_complete = cachefiles_lookup_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) .grab_object = cachefiles_grab_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) .update_object = cachefiles_update_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) .invalidate_object = cachefiles_invalidate_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) .drop_object = cachefiles_drop_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) .put_object = cachefiles_put_object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) .sync_cache = cachefiles_sync_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) .attr_changed = cachefiles_attr_changed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) .read_or_alloc_page = cachefiles_read_or_alloc_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) .read_or_alloc_pages = cachefiles_read_or_alloc_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) .allocate_page = cachefiles_allocate_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) .allocate_pages = cachefiles_allocate_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) .write_page = cachefiles_write_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) .uncache_page = cachefiles_uncache_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) .dissociate_pages = cachefiles_dissociate_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) .check_consistency = cachefiles_check_consistency,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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