blob: 54ffced3bce8c037f045441155e86f03842e5da7 [file] [log] [blame]
Omar Sandovala5ed9182015-09-29 20:50:35 -07001/*
2 * Copyright (C) 2015 Facebook. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#ifndef __BTRFS_FREE_SPACE_TREE
20#define __BTRFS_FREE_SPACE_TREE
21
22/*
23 * The default size for new free space bitmap items. The last bitmap in a block
24 * group may be truncated, and none of the free space tree code assumes that
25 * existing bitmaps are this size.
26 */
27#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
28#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
29
30void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
31int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
32int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
33int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
34int add_block_group_free_space(struct btrfs_trans_handle *trans,
35 struct btrfs_fs_info *fs_info,
36 struct btrfs_block_group_cache *block_group);
37int remove_block_group_free_space(struct btrfs_trans_handle *trans,
38 struct btrfs_fs_info *fs_info,
39 struct btrfs_block_group_cache *block_group);
40int add_to_free_space_tree(struct btrfs_trans_handle *trans,
41 struct btrfs_fs_info *fs_info,
42 u64 start, u64 size);
43int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
44 struct btrfs_fs_info *fs_info,
45 u64 start, u64 size);
46
47/* Exposed for testing. */
48struct btrfs_free_space_info *
49search_free_space_info(struct btrfs_trans_handle *trans,
50 struct btrfs_fs_info *fs_info,
51 struct btrfs_block_group_cache *block_group,
52 struct btrfs_path *path, int cow);
53int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
54 struct btrfs_fs_info *fs_info,
55 struct btrfs_block_group_cache *block_group,
56 struct btrfs_path *path, u64 start, u64 size);
57int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
58 struct btrfs_fs_info *fs_info,
59 struct btrfs_block_group_cache *block_group,
60 struct btrfs_path *path, u64 start, u64 size);
61int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
62 struct btrfs_fs_info *fs_info,
63 struct btrfs_block_group_cache *block_group,
64 struct btrfs_path *path);
65int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
66 struct btrfs_fs_info *fs_info,
67 struct btrfs_block_group_cache *block_group,
68 struct btrfs_path *path);
69int free_space_test_bit(struct btrfs_block_group_cache *block_group,
70 struct btrfs_path *path, u64 offset);
71
72#endif