xref: /openbmc/linux/fs/btrfs/free-space-tree.h (revision b732539e)
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 /*
10  * The default size for new free space bitmap items. The last bitmap in a block
11  * group may be truncated, and none of the free space tree code assumes that
12  * existing bitmaps are this size.
13  */
14 #define BTRFS_FREE_SPACE_BITMAP_SIZE 256
15 #define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
16 
17 void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
18 int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
19 int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
20 int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
21 int add_block_group_free_space(struct btrfs_trans_handle *trans,
22 			       struct btrfs_fs_info *fs_info,
23 			       struct btrfs_block_group_cache *block_group);
24 int remove_block_group_free_space(struct btrfs_trans_handle *trans,
25 				  struct btrfs_fs_info *fs_info,
26 				  struct btrfs_block_group_cache *block_group);
27 int add_to_free_space_tree(struct btrfs_trans_handle *trans,
28 			   struct btrfs_fs_info *fs_info,
29 			   u64 start, u64 size);
30 int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
31 				struct btrfs_fs_info *fs_info,
32 				u64 start, u64 size);
33 
34 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
35 struct btrfs_free_space_info *
36 search_free_space_info(struct btrfs_trans_handle *trans,
37 		       struct btrfs_fs_info *fs_info,
38 		       struct btrfs_block_group_cache *block_group,
39 		       struct btrfs_path *path, int cow);
40 int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
41 			     struct btrfs_fs_info *fs_info,
42 			     struct btrfs_block_group_cache *block_group,
43 			     struct btrfs_path *path, u64 start, u64 size);
44 int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
45 				  struct btrfs_fs_info *fs_info,
46 				  struct btrfs_block_group_cache *block_group,
47 				  struct btrfs_path *path, u64 start, u64 size);
48 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
49 				  struct btrfs_fs_info *fs_info,
50 				  struct btrfs_block_group_cache *block_group,
51 				  struct btrfs_path *path);
52 int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
53 				  struct btrfs_fs_info *fs_info,
54 				  struct btrfs_block_group_cache *block_group,
55 				  struct btrfs_path *path);
56 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
57 			struct btrfs_path *path, u64 offset);
58 #endif
59 
60 #endif
61