Btrfs: dirindex optimizations

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index b1629a5d73c8..0ee9945fb1b0 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -92,6 +92,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
         int cow = mod != 0;
         struct btrfs_disk_key *found_key;
         struct btrfs_leaf *leaf;
+        u32 overflow;
 
         key.objectid = dir;
         key.flags = 0;
@@ -119,8 +120,10 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
                 if (btrfs_match_dir_item_name(root, path, name, name_len))
                         return 0;
 
-                if (btrfs_disk_key_overflow(found_key) == 0)
+                overflow = btrfs_disk_key_overflow(found_key);
+                if (overflow == 0)
                         return 1;
+                btrfs_set_key_overflow(&key, overflow - 1);
                 btrfs_release_path(root, path);
         }
         return 1;