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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
Li Zefan261507a02010-12-17 14:21:50 +080022int btrfs_init_compress(void);
23void 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);
33int btrfs_decompress_biovec(int type, struct page **pages_in, u64 disk_start,
34 struct bio_vec *bvec, int vcnt, size_t srclen);
35int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
36 unsigned long start_byte, size_t srclen, size_t destlen);
37
Chris Masonc8b97812008-10-29 14:49:59 -040038int btrfs_submit_compressed_write(struct inode *inode, u64 start,
39 unsigned long len, u64 disk_start,
40 unsigned long compressed_len,
41 struct page **compressed_pages,
42 unsigned long nr_pages);
43int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
44 int mirror_num, unsigned long bio_flags);
Li Zefan261507a02010-12-17 14:21:50 +080045
46struct btrfs_compress_op {
47 struct list_head *(*alloc_workspace)(void);
48
49 void (*free_workspace)(struct list_head *workspace);
50
51 int (*compress_pages)(struct list_head *workspace,
52 struct address_space *mapping,
53 u64 start, unsigned long len,
54 struct page **pages,
55 unsigned long nr_dest_pages,
56 unsigned long *out_pages,
57 unsigned long *total_in,
58 unsigned long *total_out,
59 unsigned long max_out);
60
61 int (*decompress_biovec)(struct list_head *workspace,
62 struct page **pages_in,
63 u64 disk_start,
64 struct bio_vec *bvec,
65 int vcnt,
66 size_t srclen);
67
68 int (*decompress)(struct list_head *workspace,
69 unsigned char *data_in,
70 struct page *dest_page,
71 unsigned long start_byte,
72 size_t srclen, size_t destlen);
73};
74
75extern struct btrfs_compress_op btrfs_zlib_compress;
Li Zefana6fa6fa2010-10-25 15:12:26 +080076extern struct btrfs_compress_op btrfs_lzo_compress;
Li Zefan261507a02010-12-17 14:21:50 +080077
Chris Masonc8b97812008-10-29 14:49:59 -040078#endif