Btrfs: minor comments

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

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 17a3ff2f182818d01a8bdeddb8ad348f740ae298..32922643b5bc9ec1bca0e9e96bf60f367a359f93 100644 (file)
--- 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;