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9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c8b97818 CM |
2 | /* |
3 | * Copyright (C) 2008 Oracle. All rights reserved. | |
c8b97818 CM |
4 | */ |
5 | ||
9888c340 DS |
6 | #ifndef BTRFS_COMPRESSION_H |
7 | #define BTRFS_COMPRESSION_H | |
c8b97818 | 8 | |
d5c1d68f QW |
9 | #include <linux/sizes.h> |
10 | ||
c7ee1819 NB |
11 | struct btrfs_inode; |
12 | ||
ff763866 DS |
13 | /* |
14 | * We want to make sure that amount of RAM required to uncompress an extent is | |
15 | * reasonable, so we limit the total size in ram of a compressed extent to | |
16 | * 128k. This is a crucial number because it also controls how easily we can | |
17 | * spread reads across cpus for decompression. | |
18 | * | |
19 | * We also want to make sure the amount of IO required to do a random read is | |
20 | * reasonably small, so we limit the size of a compressed extent to 128k. | |
21 | */ | |
22 | ||
23 | /* Maximum length of compressed data stored on disk */ | |
24 | #define BTRFS_MAX_COMPRESSED (SZ_128K) | |
25 | /* Maximum size of data before compression */ | |
26 | #define BTRFS_MAX_UNCOMPRESSED (SZ_128K) | |
27 | ||
eae8d825 QW |
28 | #define BTRFS_ZLIB_DEFAULT_LEVEL 3 |
29 | ||
e1ddce71 AJ |
30 | struct compressed_bio { |
31 | /* number of bios pending for this compressed extent */ | |
32 | refcount_t pending_bios; | |
33 | ||
34 | /* the pages with the compressed data on them */ | |
35 | struct page **compressed_pages; | |
36 | ||
37 | /* inode that owns this data */ | |
38 | struct inode *inode; | |
39 | ||
40 | /* starting offset in the inode for our pages */ | |
41 | u64 start; | |
42 | ||
43 | /* number of bytes in the inode we're working on */ | |
44 | unsigned long len; | |
45 | ||
46 | /* number of bytes on disk */ | |
47 | unsigned long compressed_len; | |
48 | ||
49 | /* the compression algorithm for this bio */ | |
50 | int compress_type; | |
51 | ||
52 | /* number of compressed pages in the array */ | |
53 | unsigned long nr_pages; | |
54 | ||
55 | /* IO errors */ | |
56 | int errors; | |
57 | int mirror_num; | |
58 | ||
59 | /* for reads, this is the bio we are copying the data into */ | |
60 | struct bio *orig_bio; | |
61 | ||
62 | /* | |
63 | * the start of a variable length array of checksums only | |
64 | * used by reads | |
65 | */ | |
10fe6ca8 | 66 | u8 sums[]; |
e1ddce71 AJ |
67 | }; |
68 | ||
1972708a DZ |
69 | static inline unsigned int btrfs_compress_type(unsigned int type_level) |
70 | { | |
71 | return (type_level & 0xF); | |
72 | } | |
73 | ||
74 | static inline unsigned int btrfs_compress_level(unsigned int type_level) | |
75 | { | |
76 | return ((type_level & 0xF0) >> 4); | |
77 | } | |
78 | ||
f5c29bd9 | 79 | void __init btrfs_init_compress(void); |
e67c718b | 80 | void __cold btrfs_exit_compress(void); |
261507a0 | 81 | |
f51d2b59 | 82 | int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping, |
38c31464 | 83 | u64 start, struct page **pages, |
261507a0 LZ |
84 | unsigned long *out_pages, |
85 | unsigned long *total_in, | |
e5d74902 | 86 | unsigned long *total_out); |
261507a0 LZ |
87 | int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, |
88 | unsigned long start_byte, size_t srclen, size_t destlen); | |
14a3357b | 89 | int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start, |
3a39c18d | 90 | unsigned long total_out, u64 disk_start, |
974b1adc | 91 | struct bio *bio); |
261507a0 | 92 | |
c7ee1819 | 93 | blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, |
c8b97818 CM |
94 | unsigned long len, u64 disk_start, |
95 | unsigned long compressed_len, | |
96 | struct page **compressed_pages, | |
f82b7359 | 97 | unsigned long nr_pages, |
ec39f769 CM |
98 | unsigned int write_flags, |
99 | struct cgroup_subsys_state *blkcg_css); | |
4e4cbee9 | 100 | blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, |
c8b97818 | 101 | int mirror_num, unsigned long bio_flags); |
ebb8765b | 102 | |
d0ab62ce | 103 | unsigned int btrfs_compress_str2level(unsigned int type, const char *str); |
f51d2b59 | 104 | |
ebb8765b AJ |
105 | enum btrfs_compression_type { |
106 | BTRFS_COMPRESS_NONE = 0, | |
107 | BTRFS_COMPRESS_ZLIB = 1, | |
108 | BTRFS_COMPRESS_LZO = 2, | |
5c1aab1d | 109 | BTRFS_COMPRESS_ZSTD = 3, |
ce96b7ff | 110 | BTRFS_NR_COMPRESS_TYPES = 4, |
ebb8765b AJ |
111 | }; |
112 | ||
92ee5530 | 113 | struct workspace_manager { |
92ee5530 DZ |
114 | struct list_head idle_ws; |
115 | spinlock_t ws_lock; | |
116 | /* Number of free workspaces */ | |
117 | int free_ws; | |
118 | /* Total number of allocated workspaces */ | |
119 | atomic_t total_ws; | |
120 | /* Waiters for a free workspace */ | |
121 | wait_queue_head_t ws_wait; | |
122 | }; | |
123 | ||
5907a9bb | 124 | struct list_head *btrfs_get_workspace(int type, unsigned int level); |
a3bbd2a9 | 125 | void btrfs_put_workspace(int type, struct list_head *ws); |
92ee5530 | 126 | |
261507a0 | 127 | struct btrfs_compress_op { |
be951045 | 128 | struct workspace_manager *workspace_manager; |
e18333a7 DS |
129 | /* Maximum level supported by the compression algorithm */ |
130 | unsigned int max_level; | |
131 | unsigned int default_level; | |
261507a0 LZ |
132 | }; |
133 | ||
ca4ac360 | 134 | /* The heuristic workspaces are managed via the 0th workspace manager */ |
ce96b7ff | 135 | #define BTRFS_NR_WORKSPACE_MANAGERS BTRFS_NR_COMPRESS_TYPES |
ca4ac360 DZ |
136 | |
137 | extern const struct btrfs_compress_op btrfs_heuristic_compress; | |
e8c9f186 DS |
138 | extern const struct btrfs_compress_op btrfs_zlib_compress; |
139 | extern const struct btrfs_compress_op btrfs_lzo_compress; | |
5c1aab1d | 140 | extern const struct btrfs_compress_op btrfs_zstd_compress; |
261507a0 | 141 | |
e128f9c3 | 142 | const char* btrfs_compress_type2str(enum btrfs_compression_type type); |
aa53e3bf | 143 | bool btrfs_compress_is_valid_type(const char *str, size_t len); |
e128f9c3 | 144 | |
c2fcdcdf TT |
145 | int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end); |
146 | ||
c8b97818 | 147 | #endif |