1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) Qu Wenruo 2017.  All rights reserved.
 4 */
 5
 6#ifndef BTRFS_TREE_CHECKER_H
 7#define BTRFS_TREE_CHECKER_H
 8
 9#include <uapi/linux/btrfs_tree.h>
10
11struct extent_buffer;
12struct btrfs_chunk;
13
14/* All the extra info needed to verify the parentness of a tree block. */
15struct btrfs_tree_parent_check {
16	/*
17	 * The owner check against the tree block.
18	 *
19	 * Can be 0 to skip the owner check.
20	 */
21	u64 owner_root;
22
23	/*
24	 * Expected transid, can be 0 to skip the check, but such skip
25	 * should only be utilized for backref walk related code.
26	 */
27	u64 transid;
28
29	/*
30	 * The expected first key.
31	 *
32	 * This check can be skipped if @has_first_key is false, such skip
33	 * can happen for case where we don't have the parent node key,
34	 * e.g. reading the tree root, doing backref walk.
35	 */
36	struct btrfs_key first_key;
37	bool has_first_key;
38
39	/* The expected level. Should always be set. */
40	u8 level;
41};
42
43enum btrfs_tree_block_status {
44	BTRFS_TREE_BLOCK_CLEAN,
45	BTRFS_TREE_BLOCK_INVALID_NRITEMS,
46	BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
47	BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
48	BTRFS_TREE_BLOCK_INVALID_LEVEL,
49	BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
50	BTRFS_TREE_BLOCK_INVALID_OFFSETS,
51	BTRFS_TREE_BLOCK_INVALID_BLOCKPTR,
52	BTRFS_TREE_BLOCK_INVALID_ITEM,
53	BTRFS_TREE_BLOCK_INVALID_OWNER,
54};
55
56/*
57 * Exported simply for btrfs-progs which wants to have the
58 * btrfs_tree_block_status return codes.
59 */
60enum btrfs_tree_block_status __btrfs_check_leaf(struct extent_buffer *leaf);
61enum btrfs_tree_block_status __btrfs_check_node(struct extent_buffer *node);
62
63int btrfs_check_leaf(struct extent_buffer *leaf);
64int btrfs_check_node(struct extent_buffer *node);
65
66int btrfs_check_chunk_valid(struct extent_buffer *leaf,
67			    struct btrfs_chunk *chunk, u64 logical);
68int btrfs_check_eb_owner(const struct extent_buffer *eb, u64 root_owner);
69int btrfs_verify_level_key(struct extent_buffer *eb, int level,
70			   struct btrfs_key *first_key, u64 parent_transid);
71
72#endif