Loading...
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
22int 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);
37int 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
43int 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);
48int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
49 int mirror_num, unsigned long bio_flags);
50
51struct 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
80extern struct btrfs_compress_op btrfs_zlib_compress;
81extern struct btrfs_compress_op btrfs_lzo_compress;
82
83#endif
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
22void 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(int type, unsigned char *data_in, struct page *dest_page,
34 unsigned long start_byte, size_t srclen, size_t destlen);
35int 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);
40
41int 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);
46int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
47 int mirror_num, unsigned long bio_flags);
48void btrfs_clear_biovec_end(struct bio_vec *bvec, int vcnt,
49 unsigned long pg_index,
50 unsigned long pg_offset);
51
52enum btrfs_compression_type {
53 BTRFS_COMPRESS_NONE = 0,
54 BTRFS_COMPRESS_ZLIB = 1,
55 BTRFS_COMPRESS_LZO = 2,
56 BTRFS_COMPRESS_TYPES = 2,
57 BTRFS_COMPRESS_LAST = 3,
58};
59
60struct btrfs_compress_op {
61 struct list_head *(*alloc_workspace)(void);
62
63 void (*free_workspace)(struct list_head *workspace);
64
65 int (*compress_pages)(struct list_head *workspace,
66 struct address_space *mapping,
67 u64 start, unsigned long len,
68 struct page **pages,
69 unsigned long nr_dest_pages,
70 unsigned long *out_pages,
71 unsigned long *total_in,
72 unsigned long *total_out,
73 unsigned long max_out);
74
75 int (*decompress_biovec)(struct list_head *workspace,
76 struct page **pages_in,
77 u64 disk_start,
78 struct bio_vec *bvec,
79 int vcnt,
80 size_t srclen);
81
82 int (*decompress)(struct list_head *workspace,
83 unsigned char *data_in,
84 struct page *dest_page,
85 unsigned long start_byte,
86 size_t srclen, size_t destlen);
87};
88
89extern const struct btrfs_compress_op btrfs_zlib_compress;
90extern const struct btrfs_compress_op btrfs_lzo_compress;
91
92#endif