LXR linux/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