diff options
Diffstat (limited to 'fs/btrfs/lru_cache.h')
| -rw-r--r-- | fs/btrfs/lru_cache.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/lru_cache.h b/fs/btrfs/lru_cache.h index 7a255cd2958e..c1f20f4b7038 100644 --- a/fs/btrfs/lru_cache.h +++ b/fs/btrfs/lru_cache.h @@ -18,6 +18,13 @@ struct btrfs_lru_cache_entry { struct list_head lru_list; u64 key; /* + * Optional generation associated to a key. Use 0 if not needed/used. + * Entries with the same key and different generations are stored in a + * linked list, so use this only for cases where there's a small number + * of different generations. + */ + u64 gen; + /* * The maple tree uses unsigned long type for the keys, which is 32 bits * on 32 bits systems, and 64 bits on 64 bits systems. So if we want to * use something like inode numbers as keys, which are always a u64, we @@ -47,7 +54,7 @@ static inline unsigned int btrfs_lru_cache_size(const struct btrfs_lru_cache *ca void btrfs_lru_cache_init(struct btrfs_lru_cache *cache, unsigned int max_size); struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cache, - u64 key); + u64 key, u64 gen); int btrfs_lru_cache_store(struct btrfs_lru_cache *cache, struct btrfs_lru_cache_entry *new_entry, gfp_t gfp); |