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compression.h
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1 /*
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 
22 void btrfs_init_compress(void);
23 void btrfs_exit_compress(void);
24 
25 int 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);
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);
37 int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
38  unsigned long total_out, u64 disk_start,
39  struct bio_vec *bvec, int vcnt,
40  unsigned long *pg_index,
41  unsigned long *pg_offset);
42 
43 int btrfs_submit_compressed_write(struct inode *inode, u64 start,
44  unsigned long len, u64 disk_start,
45  unsigned long compressed_len,
46  struct page **compressed_pages,
47  unsigned long nr_pages);
48 int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
49  int mirror_num, unsigned long bio_flags);
50 
51 struct btrfs_compress_op {
52  struct list_head *(*alloc_workspace)(void);
53 
54  void (*free_workspace)(struct list_head *workspace);
55 
56  int (*compress_pages)(struct list_head *workspace,
57  struct address_space *mapping,
58  u64 start, unsigned long len,
59  struct page **pages,
60  unsigned long nr_dest_pages,
61  unsigned long *out_pages,
62  unsigned long *total_in,
63  unsigned long *total_out,
64  unsigned long max_out);
65 
66  int (*decompress_biovec)(struct list_head *workspace,
67  struct page **pages_in,
68  u64 disk_start,
69  struct bio_vec *bvec,
70  int vcnt,
71  size_t srclen);
72 
73  int (*decompress)(struct list_head *workspace,
74  unsigned char *data_in,
75  struct page *dest_page,
76  unsigned long start_byte,
77  size_t srclen, size_t destlen);
78 };
79 
80 extern struct btrfs_compress_op btrfs_zlib_compress;
81 extern struct btrfs_compress_op btrfs_lzo_compress;
82 
83 #endif
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