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 int 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_biovec(int type
, struct page
**pages_in
, u64 disk_start
,
34 struct bio_vec
*bvec
, int vcnt
, size_t srclen
);
35 int btrfs_decompress(int type
, unsigned char *data_in
, struct page
*dest_page
,
36 unsigned long start_byte
, size_t srclen
, size_t destlen
);
38 int 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
);
43 int btrfs_submit_compressed_read(struct inode
*inode
, struct bio
*bio
,
44 int mirror_num
, unsigned long bio_flags
);
46 struct btrfs_compress_op
{
47 struct list_head
*(*alloc_workspace
)(void);
49 void (*free_workspace
)(struct list_head
*workspace
);
51 int (*compress_pages
)(struct list_head
*workspace
,
52 struct address_space
*mapping
,
53 u64 start
, unsigned long len
,
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
);
61 int (*decompress_biovec
)(struct list_head
*workspace
,
62 struct page
**pages_in
,
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
);
75 extern struct btrfs_compress_op btrfs_zlib_compress
;