b3a4fce7946ad3eb135ba11dfb6b40dc43c89231
[sfrench/cifs-2.6.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_trans_handle *trans,
45                             struct btrfs_block_group_cache *block_group,
46                             struct btrfs_path *path);
47
48 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
49                                        struct btrfs_block_rsv *rsv);
50 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
51                                     struct btrfs_block_group_cache *block_group,
52                                     struct inode *inode);
53 int load_free_space_cache(struct btrfs_fs_info *fs_info,
54                           struct btrfs_block_group_cache *block_group);
55 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
56                         struct btrfs_block_group_cache *block_group,
57                         struct btrfs_path *path);
58 int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
59                           struct btrfs_block_group_cache *block_group,
60                           struct btrfs_path *path);
61 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
62                                     struct btrfs_path *path);
63 int create_free_ino_inode(struct btrfs_root *root,
64                           struct btrfs_trans_handle *trans,
65                           struct btrfs_path *path);
66 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
67                         struct btrfs_root *root);
68 int btrfs_write_out_ino_cache(struct btrfs_root *root,
69                               struct btrfs_trans_handle *trans,
70                               struct btrfs_path *path,
71                               struct inode *inode);
72
73 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
74 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
75                            struct btrfs_free_space_ctl *ctl,
76                            u64 bytenr, u64 size);
77 static inline int
78 btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
79                      u64 bytenr, u64 size)
80 {
81         return __btrfs_add_free_space(block_group->fs_info,
82                                       block_group->free_space_ctl,
83                                       bytenr, size);
84 }
85 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
86                             u64 bytenr, u64 size);
87 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
88 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
89                                      *block_group);
90 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
91                                u64 offset, u64 bytes, u64 empty_size,
92                                u64 *max_extent_size);
93 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
94 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
95                            u64 bytes);
96 int btrfs_find_space_cluster(struct btrfs_fs_info *fs_info,
97                              struct btrfs_block_group_cache *block_group,
98                              struct btrfs_free_cluster *cluster,
99                              u64 offset, u64 bytes, u64 empty_size);
100 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
101 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
102                              struct btrfs_free_cluster *cluster, u64 bytes,
103                              u64 min_start, u64 *max_extent_size);
104 int btrfs_return_cluster_to_free_space(
105                                struct btrfs_block_group_cache *block_group,
106                                struct btrfs_free_cluster *cluster);
107 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
108                            u64 *trimmed, u64 start, u64 end, u64 minlen);
109
110 /* Support functions for running our sanity tests */
111 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
112 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
113                               u64 offset, u64 bytes, bool bitmap);
114 int test_check_exists(struct btrfs_block_group_cache *cache,
115                       u64 offset, u64 bytes);
116 #endif
117
118 #endif