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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 unsigned long *bitmap;
27 struct list_head list;
28};
29
30struct btrfs_free_space_ctl {
31 spinlock_t tree_lock;
32 struct rb_root free_space_offset;
33 u64 free_space;
34 int extents_thresh;
35 int free_extents;
36 int total_bitmaps;
37 int unit;
38 u64 start;
39 struct btrfs_free_space_op *op;
40 void *private;
41};
42
43struct btrfs_free_space_op {
44 void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
45 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
46 struct btrfs_free_space *info);
47};
48
49struct inode *lookup_free_space_inode(struct btrfs_root *root,
50 struct btrfs_block_group_cache
51 *block_group, struct btrfs_path *path);
52int create_free_space_inode(struct btrfs_root *root,
53 struct btrfs_trans_handle *trans,
54 struct btrfs_block_group_cache *block_group,
55 struct btrfs_path *path);
56
57int btrfs_truncate_free_space_cache(struct btrfs_root *root,
58 struct btrfs_trans_handle *trans,
59 struct btrfs_path *path,
60 struct inode *inode);
61int load_free_space_cache(struct btrfs_fs_info *fs_info,
62 struct btrfs_block_group_cache *block_group);
63int btrfs_write_out_cache(struct btrfs_root *root,
64 struct btrfs_trans_handle *trans,
65 struct btrfs_block_group_cache *block_group,
66 struct btrfs_path *path);
67
68struct inode *lookup_free_ino_inode(struct btrfs_root *root,
69 struct btrfs_path *path);
70int create_free_ino_inode(struct btrfs_root *root,
71 struct btrfs_trans_handle *trans,
72 struct btrfs_path *path);
73int load_free_ino_cache(struct btrfs_fs_info *fs_info,
74 struct btrfs_root *root);
75int btrfs_write_out_ino_cache(struct btrfs_root *root,
76 struct btrfs_trans_handle *trans,
77 struct btrfs_path *path);
78
79void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
80int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
81 u64 bytenr, u64 size);
82static inline int
83btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
84 u64 bytenr, u64 size)
85{
86 return __btrfs_add_free_space(block_group->free_space_ctl,
87 bytenr, size);
88}
89int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
90 u64 bytenr, u64 size);
91void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
92void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
93 *block_group);
94u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
95 u64 offset, u64 bytes, u64 empty_size);
96u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
97void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
98 u64 bytes);
99int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
100 struct btrfs_root *root,
101 struct btrfs_block_group_cache *block_group,
102 struct btrfs_free_cluster *cluster,
103 u64 offset, u64 bytes, u64 empty_size);
104void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
105u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
106 struct btrfs_free_cluster *cluster, u64 bytes,
107 u64 min_start);
108int btrfs_return_cluster_to_free_space(
109 struct btrfs_block_group_cache *block_group,
110 struct btrfs_free_cluster *cluster);
111int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
112 u64 *trimmed, u64 start, u64 end, u64 minlen);
113#endif
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#include <linux/rbtree.h>
10#include <linux/list.h>
11#include <linux/spinlock.h>
12#include <linux/mutex.h>
13#include "fs.h"
14
15struct inode;
16struct page;
17struct btrfs_fs_info;
18struct btrfs_path;
19struct btrfs_trans_handle;
20struct btrfs_trim_block_group;
21
22/*
23 * This is the trim state of an extent or bitmap.
24 *
25 * BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
26 * bitmap as we may need several trims to fully trim a single bitmap entry.
27 * This is reset should any free space other than trimmed space be added to the
28 * bitmap.
29 */
30enum btrfs_trim_state {
31 BTRFS_TRIM_STATE_UNTRIMMED,
32 BTRFS_TRIM_STATE_TRIMMED,
33 BTRFS_TRIM_STATE_TRIMMING,
34};
35
36struct btrfs_free_space {
37 struct rb_node offset_index;
38 struct rb_node bytes_index;
39 u64 offset;
40 u64 bytes;
41 u64 max_extent_size;
42 unsigned long *bitmap;
43 struct list_head list;
44 enum btrfs_trim_state trim_state;
45 s32 bitmap_extents;
46};
47
48static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
49{
50 return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
51}
52
53static inline bool btrfs_free_space_trimming_bitmap(
54 struct btrfs_free_space *info)
55{
56 return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
57}
58
59/*
60 * Deltas are an effective way to populate global statistics. Give macro names
61 * to make it clear what we're doing. An example is discard_extents in
62 * btrfs_free_space_ctl.
63 */
64enum {
65 BTRFS_STAT_CURR,
66 BTRFS_STAT_PREV,
67 BTRFS_STAT_NR_ENTRIES,
68};
69
70struct btrfs_free_space_ctl {
71 spinlock_t tree_lock;
72 struct rb_root free_space_offset;
73 struct rb_root_cached free_space_bytes;
74 u64 free_space;
75 int extents_thresh;
76 int free_extents;
77 int total_bitmaps;
78 int unit;
79 u64 start;
80 s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
81 s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
82 const struct btrfs_free_space_op *op;
83 struct btrfs_block_group *block_group;
84 struct mutex cache_writeout_mutex;
85 struct list_head trimming_ranges;
86};
87
88struct btrfs_free_space_op {
89 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
90 struct btrfs_free_space *info);
91};
92
93struct btrfs_io_ctl {
94 void *cur, *orig;
95 struct page *page;
96 struct page **pages;
97 struct btrfs_fs_info *fs_info;
98 struct inode *inode;
99 unsigned long size;
100 int index;
101 int num_pages;
102 int entries;
103 int bitmaps;
104};
105
106int __init btrfs_free_space_init(void);
107void __cold btrfs_free_space_exit(void);
108struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
109 struct btrfs_path *path);
110int create_free_space_inode(struct btrfs_trans_handle *trans,
111 struct btrfs_block_group *block_group,
112 struct btrfs_path *path);
113int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
114 struct inode *inode,
115 struct btrfs_block_group *block_group);
116
117int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
118 struct btrfs_block_group *block_group,
119 struct inode *inode);
120int load_free_space_cache(struct btrfs_block_group *block_group);
121int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
122 struct btrfs_block_group *block_group,
123 struct btrfs_path *path);
124int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
125 struct btrfs_block_group *block_group,
126 struct btrfs_path *path);
127
128void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
129 struct btrfs_free_space_ctl *ctl);
130int btrfs_add_free_space(struct btrfs_block_group *block_group,
131 u64 bytenr, u64 size);
132int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
133 u64 bytenr, u64 size);
134int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
135 u64 bytenr, u64 size);
136int btrfs_remove_free_space(struct btrfs_block_group *block_group,
137 u64 bytenr, u64 size);
138void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
139bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
140u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
141 u64 offset, u64 bytes, u64 empty_size,
142 u64 *max_extent_size);
143void btrfs_dump_free_space(struct btrfs_block_group *block_group,
144 u64 bytes);
145int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
146 struct btrfs_free_cluster *cluster,
147 u64 offset, u64 bytes, u64 empty_size);
148void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
149u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
150 struct btrfs_free_cluster *cluster, u64 bytes,
151 u64 min_start, u64 *max_extent_size);
152void btrfs_return_cluster_to_free_space(
153 struct btrfs_block_group *block_group,
154 struct btrfs_free_cluster *cluster);
155int btrfs_trim_block_group(struct btrfs_block_group *block_group,
156 u64 *trimmed, u64 start, u64 end, u64 minlen);
157int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
158 u64 *trimmed, u64 start, u64 end, u64 minlen,
159 bool async);
160int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
161 u64 *trimmed, u64 start, u64 end, u64 minlen,
162 u64 maxlen, bool async);
163
164bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info);
165int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active);
166/* Support functions for running our sanity tests */
167#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
168int test_add_free_space_entry(struct btrfs_block_group *cache,
169 u64 offset, u64 bytes, bool bitmap);
170int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
171#endif
172
173#endif