1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 17a3ff2f1828..32922643b5bc 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -294,6 +294,10 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
                 parent_buf = path->nodes[level + 1];
         pslot = path->slots[level + 1];
 
+        /*
+         * deal with the case where there is only one pointer in the root
+         * by promoting the node below to a root
+         */
         if (!parent_buf) {
                 struct btrfs_buffer *child;
                 u64 blocknr = mid_buf->blocknr;
@@ -1043,6 +1047,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
         int ret;
         int wret;
 
+        /* first try to make some room by pushing left and right */
         wret = push_leaf_left(trans, root, path, data_size);
         if (wret < 0)
                 return wret;