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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
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 *bio);
38
39int btrfs_submit_compressed_write(struct inode *inode, u64 start,
40 unsigned long len, u64 disk_start,
41 unsigned long compressed_len,
42 struct page **compressed_pages,
43 unsigned long nr_pages);
44int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
45 int mirror_num, unsigned long bio_flags);
46
47enum btrfs_compression_type {
48 BTRFS_COMPRESS_NONE = 0,
49 BTRFS_COMPRESS_ZLIB = 1,
50 BTRFS_COMPRESS_LZO = 2,
51 BTRFS_COMPRESS_TYPES = 2,
52 BTRFS_COMPRESS_LAST = 3,
53};
54
55struct btrfs_compress_op {
56 struct list_head *(*alloc_workspace)(void);
57
58 void (*free_workspace)(struct list_head *workspace);
59
60 int (*compress_pages)(struct list_head *workspace,
61 struct address_space *mapping,
62 u64 start, unsigned long len,
63 struct page **pages,
64 unsigned long nr_dest_pages,
65 unsigned long *out_pages,
66 unsigned long *total_in,
67 unsigned long *total_out,
68 unsigned long max_out);
69
70 int (*decompress_bio)(struct list_head *workspace,
71 struct page **pages_in,
72 u64 disk_start,
73 struct bio *orig_bio,
74 size_t srclen);
75
76 int (*decompress)(struct list_head *workspace,
77 unsigned char *data_in,
78 struct page *dest_page,
79 unsigned long start_byte,
80 size_t srclen, size_t destlen);
81};
82
83extern const struct btrfs_compress_op btrfs_zlib_compress;
84extern const struct btrfs_compress_op btrfs_lzo_compress;
85
86#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