Line data Source code
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 : /*
10 : * This is the trim state of an extent or bitmap.
11 : *
12 : * BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
13 : * bitmap as we may need several trims to fully trim a single bitmap entry.
14 : * This is reset should any free space other than trimmed space be added to the
15 : * bitmap.
16 : */
17 : enum btrfs_trim_state {
18 : BTRFS_TRIM_STATE_UNTRIMMED,
19 : BTRFS_TRIM_STATE_TRIMMED,
20 : BTRFS_TRIM_STATE_TRIMMING,
21 : };
22 :
23 : struct btrfs_free_space {
24 : struct rb_node offset_index;
25 : struct rb_node bytes_index;
26 : u64 offset;
27 : u64 bytes;
28 : u64 max_extent_size;
29 : unsigned long *bitmap;
30 : struct list_head list;
31 : enum btrfs_trim_state trim_state;
32 : s32 bitmap_extents;
33 : };
34 :
35 : static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
36 : {
37 37482772 : return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
38 : }
39 :
40 : static inline bool btrfs_free_space_trimming_bitmap(
41 : struct btrfs_free_space *info)
42 : {
43 381 : return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
44 : }
45 :
46 : /*
47 : * Deltas are an effective way to populate global statistics. Give macro names
48 : * to make it clear what we're doing. An example is discard_extents in
49 : * btrfs_free_space_ctl.
50 : */
51 : enum {
52 : BTRFS_STAT_CURR,
53 : BTRFS_STAT_PREV,
54 : BTRFS_STAT_NR_ENTRIES,
55 : };
56 :
57 : struct btrfs_free_space_ctl {
58 : spinlock_t tree_lock;
59 : struct rb_root free_space_offset;
60 : struct rb_root_cached free_space_bytes;
61 : u64 free_space;
62 : int extents_thresh;
63 : int free_extents;
64 : int total_bitmaps;
65 : int unit;
66 : u64 start;
67 : s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
68 : s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
69 : const struct btrfs_free_space_op *op;
70 : struct btrfs_block_group *block_group;
71 : struct mutex cache_writeout_mutex;
72 : struct list_head trimming_ranges;
73 : };
74 :
75 : struct btrfs_free_space_op {
76 : bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
77 : struct btrfs_free_space *info);
78 : };
79 :
80 : struct btrfs_io_ctl {
81 : void *cur, *orig;
82 : struct page *page;
83 : struct page **pages;
84 : struct btrfs_fs_info *fs_info;
85 : struct inode *inode;
86 : unsigned long size;
87 : int index;
88 : int num_pages;
89 : int entries;
90 : int bitmaps;
91 : };
92 :
93 : int __init btrfs_free_space_init(void);
94 : void __cold btrfs_free_space_exit(void);
95 : struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
96 : struct btrfs_path *path);
97 : int create_free_space_inode(struct btrfs_trans_handle *trans,
98 : struct btrfs_block_group *block_group,
99 : struct btrfs_path *path);
100 : int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
101 : struct inode *inode,
102 : struct btrfs_block_group *block_group);
103 :
104 : int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
105 : struct btrfs_block_group *block_group,
106 : struct inode *inode);
107 : int load_free_space_cache(struct btrfs_block_group *block_group);
108 : int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
109 : struct btrfs_block_group *block_group,
110 : struct btrfs_path *path);
111 : int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
112 : struct btrfs_block_group *block_group,
113 : struct btrfs_path *path);
114 :
115 : void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
116 : struct btrfs_free_space_ctl *ctl);
117 : int __btrfs_add_free_space(struct btrfs_block_group *block_group, u64 bytenr,
118 : u64 size, enum btrfs_trim_state trim_state);
119 : int btrfs_add_free_space(struct btrfs_block_group *block_group,
120 : u64 bytenr, u64 size);
121 : int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
122 : u64 bytenr, u64 size);
123 : int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
124 : u64 bytenr, u64 size);
125 : int btrfs_remove_free_space(struct btrfs_block_group *block_group,
126 : u64 bytenr, u64 size);
127 : void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
128 : bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
129 : u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
130 : u64 offset, u64 bytes, u64 empty_size,
131 : u64 *max_extent_size);
132 : void btrfs_dump_free_space(struct btrfs_block_group *block_group,
133 : u64 bytes);
134 : int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
135 : struct btrfs_free_cluster *cluster,
136 : u64 offset, u64 bytes, u64 empty_size);
137 : void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
138 : u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
139 : struct btrfs_free_cluster *cluster, u64 bytes,
140 : u64 min_start, u64 *max_extent_size);
141 : void btrfs_return_cluster_to_free_space(
142 : struct btrfs_block_group *block_group,
143 : struct btrfs_free_cluster *cluster);
144 : int btrfs_trim_block_group(struct btrfs_block_group *block_group,
145 : u64 *trimmed, u64 start, u64 end, u64 minlen);
146 : int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
147 : u64 *trimmed, u64 start, u64 end, u64 minlen,
148 : bool async);
149 : int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
150 : u64 *trimmed, u64 start, u64 end, u64 minlen,
151 : u64 maxlen, bool async);
152 :
153 : bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info);
154 : int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active);
155 : /* Support functions for running our sanity tests */
156 : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
157 : int test_add_free_space_entry(struct btrfs_block_group *cache,
158 : u64 offset, u64 bytes, bool bitmap);
159 : int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
160 : #endif
161 :
162 : #endif
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