Root/fs/btrfs/compression.h

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_zlib_decompress(unsigned char *data_in,
23              struct page *dest_page,
24              unsigned long start_byte,
25              size_t srclen, size_t destlen);
26int btrfs_zlib_compress_pages(struct address_space *mapping,
27                  u64 start, unsigned long len,
28                  struct page **pages,
29                  unsigned long nr_dest_pages,
30                  unsigned long *out_pages,
31                  unsigned long *total_in,
32                  unsigned long *total_out,
33                  unsigned long max_out);
34int btrfs_zlib_decompress_biovec(struct page **pages_in,
35                  u64 disk_start,
36                  struct bio_vec *bvec,
37                  int vcnt,
38                  size_t srclen);
39void btrfs_zlib_exit(void);
40int btrfs_submit_compressed_write(struct inode *inode, u64 start,
41                  unsigned long len, u64 disk_start,
42                  unsigned long compressed_len,
43                  struct page **compressed_pages,
44                  unsigned long nr_pages);
45int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
46                 int mirror_num, unsigned long bio_flags);
47#endif
48

Archive Download this file



interactive