2 * Copyright (C) 2008 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_COMPRESSION_
20 #define __BTRFS_COMPRESSION_
22 void btrfs_init_compress(void);
23 void btrfs_exit_compress(void);
25 int btrfs_compress_pages(int type, struct address_space *mapping,
26 u64 start, unsigned long len,
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);
33 int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
34 unsigned long start_byte, size_t srclen, size_t destlen);
35 int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
36 unsigned long total_out, u64 disk_start,
37 struct bio_vec *bvec, int vcnt,
38 unsigned long *pg_index,
39 unsigned long *pg_offset);
41 int btrfs_submit_compressed_write(struct inode *inode, u64 start,
42 unsigned long len, u64 disk_start,
43 unsigned long compressed_len,
44 struct page **compressed_pages,
45 unsigned long nr_pages);
46 int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
47 int mirror_num, unsigned long bio_flags);
49 struct btrfs_compress_op {
50 struct list_head *(*alloc_workspace)(void);
52 void (*free_workspace)(struct list_head *workspace);
54 int (*compress_pages)(struct list_head *workspace,
55 struct address_space *mapping,
56 u64 start, unsigned long len,
58 unsigned long nr_dest_pages,
59 unsigned long *out_pages,
60 unsigned long *total_in,
61 unsigned long *total_out,
62 unsigned long max_out);
64 int (*decompress_biovec)(struct list_head *workspace,
65 struct page **pages_in,
71 int (*decompress)(struct list_head *workspace,
72 unsigned char *data_in,
73 struct page *dest_page,
74 unsigned long start_byte,
75 size_t srclen, size_t destlen);
78 extern struct btrfs_compress_op btrfs_zlib_compress;
79 extern struct btrfs_compress_op btrfs_lzo_compress;