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Chris Masonc8b97812008-10-29 14:49:59 -04001/*
2 * Copyright (C) 2008 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_COMPRESSION_
20#define __BTRFS_COMPRESSION_
21
Jeff Mahoney143bede2012-03-01 14:56:26 +010022void btrfs_init_compress(void);
Li Zefan261507a02010-12-17 14:21:50 +080023void btrfs_exit_compress(void);
24
25int btrfs_compress_pages(int type, struct address_space *mapping,
26 u64 start, unsigned long len,
27 struct page **pages,
28 unsigned long nr_dest_pages,
29 unsigned long *out_pages,
30 unsigned long *total_in,
31 unsigned long *total_out,
32 unsigned long max_out);
Li Zefan261507a02010-12-17 14:21:50 +080033int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
34 unsigned long start_byte, size_t srclen, size_t destlen);
Li Zefan3a39c182010-11-08 15:22:19 +080035int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
36 unsigned long total_out, u64 disk_start,
Christoph Hellwig974b1ad2016-11-25 09:07:46 +010037 struct bio *bio);
Li Zefan261507a02010-12-17 14:21:50 +080038
Chris Masonc8b97812008-10-29 14:49:59 -040039int btrfs_submit_compressed_write(struct inode *inode, u64 start,
40 unsigned long len, u64 disk_start,
41 unsigned long compressed_len,
42 struct page **compressed_pages,
43 unsigned long nr_pages);
44int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
45 int mirror_num, unsigned long bio_flags);
Anand Jainebb87652016-03-10 17:26:59 +080046
47enum btrfs_compression_type {
48 BTRFS_COMPRESS_NONE = 0,
49 BTRFS_COMPRESS_ZLIB = 1,
50 BTRFS_COMPRESS_LZO = 2,
51 BTRFS_COMPRESS_TYPES = 2,
52 BTRFS_COMPRESS_LAST = 3,
53};
54
Li Zefan261507a02010-12-17 14:21:50 +080055struct btrfs_compress_op {
56 struct list_head *(*alloc_workspace)(void);
57
58 void (*free_workspace)(struct list_head *workspace);
59
60 int (*compress_pages)(struct list_head *workspace,
61 struct address_space *mapping,
62 u64 start, unsigned long len,
63 struct page **pages,
64 unsigned long nr_dest_pages,
65 unsigned long *out_pages,
66 unsigned long *total_in,
67 unsigned long *total_out,
68 unsigned long max_out);
69
Christoph Hellwig974b1ad2016-11-25 09:07:46 +010070 int (*decompress_bio)(struct list_head *workspace,
Li Zefan261507a02010-12-17 14:21:50 +080071 struct page **pages_in,
72 u64 disk_start,
Christoph Hellwig974b1ad2016-11-25 09:07:46 +010073 struct bio *orig_bio,
Li Zefan261507a02010-12-17 14:21:50 +080074 size_t srclen);
75
76 int (*decompress)(struct list_head *workspace,
77 unsigned char *data_in,
78 struct page *dest_page,
79 unsigned long start_byte,
80 size_t srclen, size_t destlen);
81};
82
David Sterbae8c9f182015-01-02 18:23:10 +010083extern const struct btrfs_compress_op btrfs_zlib_compress;
84extern const struct btrfs_compress_op btrfs_lzo_compress;
Li Zefan261507a02010-12-17 14:21:50 +080085
Chris Masonc8b97812008-10-29 14:49:59 -040086#endif