diff options
Diffstat (limited to 'fs/btrfs/lru_cache.c')
| -rw-r--r-- | fs/btrfs/lru_cache.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/btrfs/lru_cache.c b/fs/btrfs/lru_cache.c index 6012bceedffc..01821d66a8a2 100644 --- a/fs/btrfs/lru_cache.c +++ b/fs/btrfs/lru_cache.c @@ -18,12 +18,13 @@ void btrfs_lru_cache_init(struct btrfs_lru_cache *cache, unsigned int max_size) cache->max_size = max_size; } -static struct btrfs_lru_cache_entry *match_entry(struct list_head *head, u64 key) +static struct btrfs_lru_cache_entry *match_entry(struct list_head *head, u64 key, + u64 gen) { struct btrfs_lru_cache_entry *entry; list_for_each_entry(entry, head, list) { - if (entry->key == key) + if (entry->key == key && entry->gen == gen) return entry; } @@ -35,11 +36,12 @@ static struct btrfs_lru_cache_entry *match_entry(struct list_head *head, u64 key * * @cache: The cache. * @key: The key of the entry we are looking for. + * @gen: Generation associated to the key. * * Returns the entry associated with the key or NULL if none found. */ struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cache, - u64 key) + u64 key, u64 gen) { struct list_head *head; struct btrfs_lru_cache_entry *entry; @@ -48,7 +50,7 @@ struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cac if (!head) return NULL; - entry = match_entry(head, key); + entry = match_entry(head, key, gen); if (entry) list_move_tail(&entry->lru_list, &cache->lru_list); @@ -111,7 +113,7 @@ int btrfs_lru_cache_store(struct btrfs_lru_cache *cache, kfree(head); head = mtree_load(&cache->entries, key); ASSERT(head != NULL); - if (match_entry(head, key) != NULL) + if (match_entry(head, key, new_entry->gen) != NULL) return -EEXIST; list_add_tail(&new_entry->list, head); } else if (ret < 0) { |