diff --git a/fs/btrfs/tree-checker.h b/fs/btrfs/tree-checker.h
new file mode 100644
index 0000000..ff04327
--- /dev/null
+++ b/fs/btrfs/tree-checker.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) Qu Wenruo 2017.  All rights reserved.
+ */
+
+#ifndef BTRFS_TREE_CHECKER_H
+#define BTRFS_TREE_CHECKER_H
+
+#include "ctree.h"
+#include "extent_io.h"
+
+/*
+ * Comprehensive leaf checker.
+ * Will check not only the item pointers, but also every possible member
+ * in item data.
+ */
+int btrfs_check_leaf_full(struct btrfs_fs_info *fs_info,
+			  struct extent_buffer *leaf);
+
+/*
+ * Less strict leaf checker.
+ * Will only check item pointers, not reading item data.
+ */
+int btrfs_check_leaf_relaxed(struct btrfs_fs_info *fs_info,
+			     struct extent_buffer *leaf);
+int btrfs_check_node(struct btrfs_fs_info *fs_info, struct extent_buffer *node);
+
+#endif