Btrfs: bugfix in btrfs_find_parent_nodes

That one has been around since the addition of backref.c. Due to the way we
calculate our slot numbers, after adding inline refs we're missing one keyed
ref unless it's located at the beginning of a new leaf.

Reported-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b41d94a6471b..c69a846999bf 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -413,7 +413,7 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
          * enumerate all inline refs
          */
         leaf = path->nodes[0];
-        slot = path->slots[0] - 1;
+        slot = path->slots[0];
 
         item_size = btrfs_item_size_nr(leaf, slot);
         BUG_ON(item_size < sizeof(*ei));
@@ -661,8 +661,9 @@ again:
                 struct extent_buffer *leaf;
                 int slot;
 
+                path->slots[0]--;
                 leaf = path->nodes[0];
-                slot = path->slots[0] - 1;
+                slot = path->slots[0];
                 btrfs_item_key_to_cpu(leaf, &key, slot);
                 if (key.objectid == bytenr &&
                     key.type == BTRFS_EXTENT_ITEM_KEY) {