diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 41acb65..e288fe8 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -12,11 +12,11 @@
 
 struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr);
 int write_tree_block(struct ctree_root *root, struct tree_buffer *buf);
-struct ctree_root *open_ctree(char *filename);
+struct ctree_root *open_ctree(char *filename, struct ctree_super_block *s);
 int close_ctree(struct ctree_root *root);
 void tree_block_release(struct ctree_root *root, struct tree_buffer *buf);
 struct tree_buffer *alloc_free_block(struct ctree_root *root);
-int update_root_block(struct ctree_root *root);
+int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s);
 int mkfs(int fd);
 
 #define CTREE_SUPER_INFO_OFFSET(bs) (16 * (bs))