tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2009 Oracle. 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_CACHE
20#define __BTRFS_FREE_SPACE_CACHE
21
22struct btrfs_free_space {
23 struct rb_node offset_index;
24 u64 offset;
25 u64 bytes;
26 u64 max_extent_size;
27 unsigned long *bitmap;
28 struct list_head list;
29};
30
31struct btrfs_free_space_ctl {
32 spinlock_t tree_lock;
33 struct rb_root free_space_offset;
34 u64 free_space;
35 int extents_thresh;
36 int free_extents;
37 int total_bitmaps;
38 int unit;
39 u64 start;
40 const struct btrfs_free_space_op *op;
41 void *private;
42 struct mutex cache_writeout_mutex;
43 struct list_head trimming_ranges;
44};
45
46struct btrfs_free_space_op {
47 void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
48 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
49 struct btrfs_free_space *info);
50};
51
52struct btrfs_io_ctl;
53
54struct inode *lookup_free_space_inode(struct btrfs_fs_info *fs_info,
55 struct btrfs_block_group_cache
56 *block_group, struct btrfs_path *path);
57int create_free_space_inode(struct btrfs_fs_info *fs_info,
58 struct btrfs_trans_handle *trans,
59 struct btrfs_block_group_cache *block_group,
60 struct btrfs_path *path);
61
62int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
63 struct btrfs_block_rsv *rsv);
64int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
65 struct btrfs_block_group_cache *block_group,
66 struct inode *inode);
67int load_free_space_cache(struct btrfs_fs_info *fs_info,
68 struct btrfs_block_group_cache *block_group);
69int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
70 struct btrfs_block_group_cache *block_group,
71 struct btrfs_path *path);
72int btrfs_write_out_cache(struct btrfs_fs_info *fs_info,
73 struct btrfs_trans_handle *trans,
74 struct btrfs_block_group_cache *block_group,
75 struct btrfs_path *path);
76struct inode *lookup_free_ino_inode(struct btrfs_root *root,
77 struct btrfs_path *path);
78int create_free_ino_inode(struct btrfs_root *root,
79 struct btrfs_trans_handle *trans,
80 struct btrfs_path *path);
81int load_free_ino_cache(struct btrfs_fs_info *fs_info,
82 struct btrfs_root *root);
83int btrfs_write_out_ino_cache(struct btrfs_root *root,
84 struct btrfs_trans_handle *trans,
85 struct btrfs_path *path,
86 struct inode *inode);
87
88void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
89int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
90 struct btrfs_free_space_ctl *ctl,
91 u64 bytenr, u64 size);
92static inline int
93btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
94 u64 bytenr, u64 size)
95{
96 return __btrfs_add_free_space(block_group->fs_info,
97 block_group->free_space_ctl,
98 bytenr, size);
99}
100int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
101 u64 bytenr, u64 size);
102void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
103void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
104 *block_group);
105u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
106 u64 offset, u64 bytes, u64 empty_size,
107 u64 *max_extent_size);
108u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
109void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
110 u64 bytes);
111int btrfs_find_space_cluster(struct btrfs_fs_info *fs_info,
112 struct btrfs_block_group_cache *block_group,
113 struct btrfs_free_cluster *cluster,
114 u64 offset, u64 bytes, u64 empty_size);
115void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
116u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
117 struct btrfs_free_cluster *cluster, u64 bytes,
118 u64 min_start, u64 *max_extent_size);
119int btrfs_return_cluster_to_free_space(
120 struct btrfs_block_group_cache *block_group,
121 struct btrfs_free_cluster *cluster);
122int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
123 u64 *trimmed, u64 start, u64 end, u64 minlen);
124
125/* Support functions for running our sanity tests */
126#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
127int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
128 u64 offset, u64 bytes, bool bitmap);
129int test_check_exists(struct btrfs_block_group_cache *cache,
130 u64 offset, u64 bytes);
131#endif
132
133#endif