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
  22 int btrfs_zlib_decompress(unsigned char *data_in,
  23                           struct page *dest_page,
  24                           unsigned long start_byte,
  25                           size_t srclen, size_t destlen);
  26 int 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);
  34 int btrfs_zlib_decompress_biovec(struct page **pages_in,
  35                               u64 disk_start,
  36                               struct bio_vec *bvec,
  37                               int vcnt,
  38                               size_t srclen);
  39 void btrfs_zlib_exit(void);
  40 int 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);
  45 int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
  46                                  int mirror_num, unsigned long bio_flags);
  47 #endif