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-rw-r--r--fs/btrfs/ctree.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index cf32651..ef8809c 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -720,6 +720,9 @@ static int balance_level(struct btrfs_trans_handle *trans,
/* promote the child to a root */
child = read_node_slot(root, mid, 0);
BUG_ON(!child);
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
+ BUG_ON(ret);
+
root->node = child;
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
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