summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/free-space-cache.h
blob: e3d5e0ad8f8e4e06e16b7ec0b2a98e571e571c86 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2009 Oracle.  All rights reserved.
 */

#ifndef BTRFS_FREE_SPACE_CACHE_H
#define BTRFS_FREE_SPACE_CACHE_H

/*
 * This is the trim state of an extent or bitmap.
 *
 * BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
 * bitmap as we may need several trims to fully trim a single bitmap entry.
 * This is reset should any free space other than trimmed space be added to the
 * bitmap.
 */
enum btrfs_trim_state {
	BTRFS_TRIM_STATE_UNTRIMMED,
	BTRFS_TRIM_STATE_TRIMMED,
	BTRFS_TRIM_STATE_TRIMMING,
};

struct btrfs_free_space {
	struct rb_node offset_index;
	u64 offset;
	u64 bytes;
	u64 max_extent_size;
	unsigned long *bitmap;
	struct list_head list;
	enum btrfs_trim_state trim_state;
	s32 bitmap_extents;
};

static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
{
	return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
}

static inline bool btrfs_free_space_trimming_bitmap(
					    struct btrfs_free_space *info)
{
	return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
}

struct btrfs_free_space_ctl {
	spinlock_t tree_lock;
	struct rb_root free_space_offset;
	u64 free_space;
	int extents_thresh;
	int free_extents;
	int total_bitmaps;
	int unit;
	u64 start;
	s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
	s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
	const struct btrfs_free_space_op *op;
	void *private;
	struct mutex cache_writeout_mutex;
	struct list_head trimming_ranges;
};

struct btrfs_free_space_op {
	void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
	bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
			   struct btrfs_free_space *info);
};

struct btrfs_io_ctl {
	void *cur, *orig;
	struct page *page;
	struct page **pages;
	struct btrfs_fs_info *fs_info;
	struct inode *inode;
	unsigned long size;
	int index;
	int num_pages;
	int entries;
	int bitmaps;
	unsigned check_crcs:1;
};

struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
		struct btrfs_path *path);
int create_free_space_inode(struct btrfs_trans_handle *trans,
			    struct btrfs_block_group *block_group,
			    struct btrfs_path *path);

int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
				       struct btrfs_block_rsv *rsv);
int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
				    struct btrfs_block_group *block_group,
				    struct inode *inode);
int load_free_space_cache(struct btrfs_block_group *block_group);
int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
			struct btrfs_block_group *block_group,
			struct btrfs_path *path);
int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
			  struct btrfs_block_group *block_group,
			  struct btrfs_path *path);
struct inode *lookup_free_ino_inode(struct btrfs_root *root,
				    struct btrfs_path *path);
int create_free_ino_inode(struct btrfs_root *root,
			  struct btrfs_trans_handle *trans,
			  struct btrfs_path *path);
int load_free_ino_cache(struct btrfs_fs_info *fs_info,
			struct btrfs_root *root);
int btrfs_write_out_ino_cache(struct btrfs_root *root,
			      struct btrfs_trans_handle *trans,
			      struct btrfs_path *path,
			      struct inode *inode);

void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group);
int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
			   struct btrfs_free_space_ctl *ctl,
			   u64 bytenr, u64 size,
			   enum btrfs_trim_state trim_state);
int btrfs_add_free_space(struct btrfs_block_group *block_group,
			 u64 bytenr, u64 size);
int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
				       u64 bytenr, u64 size);
int btrfs_remove_free_space(struct btrfs_block_group *block_group,
			    u64 bytenr, u64 size);
void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
			       u64 offset, u64 bytes, u64 empty_size,
			       u64 *max_extent_size);
u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
void btrfs_dump_free_space(struct btrfs_block_group *block_group,
			   u64 bytes);
int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
			     struct btrfs_free_cluster *cluster,
			     u64 offset, u64 bytes, u64 empty_size);
void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
			     struct btrfs_free_cluster *cluster, u64 bytes,
			     u64 min_start, u64 *max_extent_size);
void btrfs_return_cluster_to_free_space(
			       struct btrfs_block_group *block_group,
			       struct btrfs_free_cluster *cluster);
int btrfs_trim_block_group(struct btrfs_block_group *block_group,
			   u64 *trimmed, u64 start, u64 end, u64 minlen);
int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
				   u64 *trimmed, u64 start, u64 end, u64 minlen,
				   bool async);
int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
				   u64 *trimmed, u64 start, u64 end, u64 minlen,
				   u64 maxlen, bool async);

/* Support functions for running our sanity tests */
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int test_add_free_space_entry(struct btrfs_block_group *cache,
			      u64 offset, u64 bytes, bool bitmap);
int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
#endif

#endif