Btrfs: check if leaf's parent exists before pushing items around

During splitting a leaf, pushing items around to hopefully get some space only
works when we have a parent, ie. we have at least one sibling leaf.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 0a430f7c5afd13ed837e1c75a692bd1177081f44..1c9dc71089ce5244be2554476f203f0ae09728ed 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -3986,7 +3986,7 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
                return -EOVERFLOW;
 
        /* first try to make some room by pushing left and right */
-       if (data_size) {
+       if (data_size && path->nodes[1]) {
                wret = push_leaf_right(trans, root, path, data_size,
                                       data_size, 0, 0);
                if (wret < 0)