Fix btrfs_next_leaf to check for new items after dropping locks

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

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 9601241e552b..b8f7aecf68d7 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2999,7 +2999,14 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
                 return ret;
 
         nritems = btrfs_header_nritems(path->nodes[0]);
+        /*
+         * by releasing the path above we dropped all our locks.  A balance
+         * could have added more items next to the key that used to be
+         * at the very end of the block.  So, check again here and
+         * advance the path if there are now more items available.
+         */
         if (nritems > 0 && path->slots[0] < nritems - 1) {
+                path->slots[0]++;
                 goto done;
         }