Btrfs: drop the inode map tree

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index b276a3b..c3b990b 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -22,6 +22,8 @@
 				sizeof(*inode_item));
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
+	if (ret == 0 && objectid > root->highest_inode)
+		root->highest_inode = objectid;
 	return ret;
 }