1 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/lru_cache.h b/fs/btrfs/lru_cache.h
index a97206f04990..de3e18bce24a 100644
--- a/fs/btrfs/lru_cache.h
+++ b/fs/btrfs/lru_cache.h
@@ -47,11 +47,26 @@ struct btrfs_lru_cache {
 	unsigned int max_size;
 };
 
+#define btrfs_lru_cache_for_each_entry_safe(cache, entry, tmp)		\
+	list_for_each_entry_safe_reverse((entry), (tmp), &(cache)->lru_list, lru_list)
+
 static inline unsigned int btrfs_lru_cache_size(const struct btrfs_lru_cache *cache)
 {
 	return cache->size;
 }
 
+static inline bool btrfs_lru_cache_is_full(const struct btrfs_lru_cache *cache)
+{
+	return cache->size >= cache->max_size;
+}
+
+static inline struct btrfs_lru_cache_entry *btrfs_lru_cache_lru_entry(
+					      struct btrfs_lru_cache *cache)
+{
+	return list_first_entry_or_null(&cache->lru_list,
+					struct btrfs_lru_cache_entry, lru_list);
+}
+
 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 gen);