GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / btrfs / free-space-cache.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2009 Oracle.  All rights reserved.
4  */
5
6 #ifndef BTRFS_FREE_SPACE_CACHE_H
7 #define BTRFS_FREE_SPACE_CACHE_H
8
9 struct btrfs_free_space {
10         struct rb_node offset_index;
11         u64 offset;
12         u64 bytes;
13         u64 max_extent_size;
14         unsigned long *bitmap;
15         struct list_head list;
16 };
17
18 struct btrfs_free_space_ctl {
19         spinlock_t tree_lock;
20         struct rb_root free_space_offset;
21         u64 free_space;
22         int extents_thresh;
23         int free_extents;
24         int total_bitmaps;
25         int unit;
26         u64 start;
27         const struct btrfs_free_space_op *op;
28         void *private;
29         struct mutex cache_writeout_mutex;
30         struct list_head trimming_ranges;
31 };
32
33 struct btrfs_free_space_op {
34         void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
35         bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
36                            struct btrfs_free_space *info);
37 };
38
39 struct btrfs_io_ctl;
40
41 struct inode *lookup_free_space_inode(struct btrfs_fs_info *fs_info,
42                                       struct btrfs_block_group_cache
43                                       *block_group, struct btrfs_path *path);
44 int create_free_space_inode(struct btrfs_fs_info *fs_info,
45                             struct btrfs_trans_handle *trans,
46                             struct btrfs_block_group_cache *block_group,
47                             struct btrfs_path *path);
48
49 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
50                                        struct btrfs_block_rsv *rsv);
51 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
52                                     struct btrfs_block_group_cache *block_group,
53                                     struct inode *inode);
54 int load_free_space_cache(struct btrfs_fs_info *fs_info,
55                           struct btrfs_block_group_cache *block_group);
56 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
57                         struct btrfs_block_group_cache *block_group,
58                         struct btrfs_path *path);
59 int btrfs_write_out_cache(struct btrfs_fs_info *fs_info,
60                           struct btrfs_trans_handle *trans,
61                           struct btrfs_block_group_cache *block_group,
62                           struct btrfs_path *path);
63 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
64                                     struct btrfs_path *path);
65 int create_free_ino_inode(struct btrfs_root *root,
66                           struct btrfs_trans_handle *trans,
67                           struct btrfs_path *path);
68 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
69                         struct btrfs_root *root);
70 int btrfs_write_out_ino_cache(struct btrfs_root *root,
71                               struct btrfs_trans_handle *trans,
72                               struct btrfs_path *path,
73                               struct inode *inode);
74
75 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
76 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
77                            struct btrfs_free_space_ctl *ctl,
78                            u64 bytenr, u64 size);
79 static inline int
80 btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
81                      u64 bytenr, u64 size)
82 {
83         return __btrfs_add_free_space(block_group->fs_info,
84                                       block_group->free_space_ctl,
85                                       bytenr, size);
86 }
87 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
88                             u64 bytenr, u64 size);
89 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
90 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
91                                      *block_group);
92 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
93                                u64 offset, u64 bytes, u64 empty_size,
94                                u64 *max_extent_size);
95 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
96 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
97                            u64 bytes);
98 int btrfs_find_space_cluster(struct btrfs_fs_info *fs_info,
99                              struct btrfs_block_group_cache *block_group,
100                              struct btrfs_free_cluster *cluster,
101                              u64 offset, u64 bytes, u64 empty_size);
102 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
103 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
104                              struct btrfs_free_cluster *cluster, u64 bytes,
105                              u64 min_start, u64 *max_extent_size);
106 int btrfs_return_cluster_to_free_space(
107                                struct btrfs_block_group_cache *block_group,
108                                struct btrfs_free_cluster *cluster);
109 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
110                            u64 *trimmed, u64 start, u64 end, u64 minlen);
111
112 /* Support functions for running our sanity tests */
113 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
114 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
115                               u64 offset, u64 bytes, bool bitmap);
116 int test_check_exists(struct btrfs_block_group_cache *cache,
117                       u64 offset, u64 bytes);
118 #endif
119
120 #endif