1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2015 Facebook. All rights reserved.
4 */
5
6#ifndef BTRFS_FREE_SPACE_TREE_H
7#define BTRFS_FREE_SPACE_TREE_H
8
9struct btrfs_caching_control;
10
11/*
12 * The default size for new free space bitmap items. The last bitmap in a block
13 * group may be truncated, and none of the free space tree code assumes that
14 * existing bitmaps are this size.
15 */
16#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
17#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
18
19void set_free_space_tree_thresholds(struct btrfs_block_group *block_group);
20int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
21int btrfs_delete_free_space_tree(struct btrfs_fs_info *fs_info);
22int btrfs_rebuild_free_space_tree(struct btrfs_fs_info *fs_info);
23int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
24int add_block_group_free_space(struct btrfs_trans_handle *trans,
25 struct btrfs_block_group *block_group);
26int remove_block_group_free_space(struct btrfs_trans_handle *trans,
27 struct btrfs_block_group *block_group);
28int add_to_free_space_tree(struct btrfs_trans_handle *trans,
29 u64 start, u64 size);
30int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
31 u64 start, u64 size);
32
33#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
34struct btrfs_free_space_info *
35search_free_space_info(struct btrfs_trans_handle *trans,
36 struct btrfs_block_group *block_group,
37 struct btrfs_path *path, int cow);
38int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
39 struct btrfs_block_group *block_group,
40 struct btrfs_path *path, u64 start, u64 size);
41int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
42 struct btrfs_block_group *block_group,
43 struct btrfs_path *path, u64 start, u64 size);
44int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
45 struct btrfs_block_group *block_group,
46 struct btrfs_path *path);
47int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
48 struct btrfs_block_group *block_group,
49 struct btrfs_path *path);
50int free_space_test_bit(struct btrfs_block_group *block_group,
51 struct btrfs_path *path, u64 offset);
52#endif
53
54#endif
55

source code of linux/fs/btrfs/free-space-tree.h