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6#ifndef BTRFS_COMPRESSION_H
7#define BTRFS_COMPRESSION_H
8
9#include <linux/sizes.h>
10
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21
22#define BTRFS_MAX_COMPRESSED (SZ_128K)
23
24#define BTRFS_MAX_UNCOMPRESSED (SZ_128K)
25
26#define BTRFS_ZLIB_DEFAULT_LEVEL 3
27
28struct compressed_bio {
29
30 refcount_t pending_bios;
31
32
33 struct page **compressed_pages;
34
35
36 struct inode *inode;
37
38
39 u64 start;
40
41
42 unsigned long len;
43
44
45 unsigned long compressed_len;
46
47
48 int compress_type;
49
50
51 unsigned long nr_pages;
52
53
54 int errors;
55 int mirror_num;
56
57
58 struct bio *orig_bio;
59
60
61
62
63
64 u8 sums[];
65};
66
67static inline unsigned int btrfs_compress_type(unsigned int type_level)
68{
69 return (type_level & 0xF);
70}
71
72static inline unsigned int btrfs_compress_level(unsigned int type_level)
73{
74 return ((type_level & 0xF0) >> 4);
75}
76
77void __init btrfs_init_compress(void);
78void __cold btrfs_exit_compress(void);
79
80int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping,
81 u64 start, struct page **pages,
82 unsigned long *out_pages,
83 unsigned long *total_in,
84 unsigned long *total_out);
85int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
86 unsigned long start_byte, size_t srclen, size_t destlen);
87int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
88 unsigned long total_out, u64 disk_start,
89 struct bio *bio);
90
91blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start,
92 unsigned long len, u64 disk_start,
93 unsigned long compressed_len,
94 struct page **compressed_pages,
95 unsigned long nr_pages,
96 unsigned int write_flags,
97 struct cgroup_subsys_state *blkcg_css);
98blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
99 int mirror_num, unsigned long bio_flags);
100
101unsigned int btrfs_compress_str2level(unsigned int type, const char *str);
102
103enum btrfs_compression_type {
104 BTRFS_COMPRESS_NONE = 0,
105 BTRFS_COMPRESS_ZLIB = 1,
106 BTRFS_COMPRESS_LZO = 2,
107 BTRFS_COMPRESS_ZSTD = 3,
108 BTRFS_NR_COMPRESS_TYPES = 4,
109};
110
111struct workspace_manager {
112 struct list_head idle_ws;
113 spinlock_t ws_lock;
114
115 int free_ws;
116
117 atomic_t total_ws;
118
119 wait_queue_head_t ws_wait;
120};
121
122struct list_head *btrfs_get_workspace(int type, unsigned int level);
123void btrfs_put_workspace(int type, struct list_head *ws);
124
125struct btrfs_compress_op {
126 struct workspace_manager *workspace_manager;
127
128 unsigned int max_level;
129 unsigned int default_level;
130};
131
132
133#define BTRFS_NR_WORKSPACE_MANAGERS BTRFS_NR_COMPRESS_TYPES
134
135extern const struct btrfs_compress_op btrfs_heuristic_compress;
136extern const struct btrfs_compress_op btrfs_zlib_compress;
137extern const struct btrfs_compress_op btrfs_lzo_compress;
138extern const struct btrfs_compress_op btrfs_zstd_compress;
139
140const char* btrfs_compress_type2str(enum btrfs_compression_type type);
141bool btrfs_compress_is_valid_type(const char *str, size_t len);
142
143unsigned int btrfs_compress_set_level(int type, unsigned level);
144
145int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
146
147#endif
148