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 
9 struct 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 
19 void set_free_space_tree_thresholds(struct btrfs_block_group *block_group);
20 int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
21 int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
22 int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
23 int add_block_group_free_space(struct btrfs_trans_handle *trans,
24 			       struct btrfs_block_group *block_group);
25 int remove_block_group_free_space(struct btrfs_trans_handle *trans,
26 				  struct btrfs_block_group *block_group);
27 int add_to_free_space_tree(struct btrfs_trans_handle *trans,
28 			   u64 start, u64 size);
29 int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
30 				u64 start, u64 size);
31 
32 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
33 struct btrfs_free_space_info *
34 search_free_space_info(struct btrfs_trans_handle *trans,
35 		       struct btrfs_block_group *block_group,
36 		       struct btrfs_path *path, int cow);
37 int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
38 			     struct btrfs_block_group *block_group,
39 			     struct btrfs_path *path, u64 start, u64 size);
40 int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
41 				  struct btrfs_block_group *block_group,
42 				  struct btrfs_path *path, u64 start, u64 size);
43 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
44 				  struct btrfs_block_group *block_group,
45 				  struct btrfs_path *path);
46 int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
47 				  struct btrfs_block_group *block_group,
48 				  struct btrfs_path *path);
49 int free_space_test_bit(struct btrfs_block_group *block_group,
50 			struct btrfs_path *path, u64 offset);
51 #endif
52 
53 #endif
54