text: /*
   * Copyright (C) 2008 Oracle.  All rights reserved.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public
   * License v2 as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public
   * License along with this program; if not, write to the
   * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   * Boston, MA 021110-1307, USA.
   */
  
  #ifndef __BTRFS_COMPRESSION_
  #define __BTRFS_COMPRESSION_
  
  void btrfs_init_compress(void);
  void btrfs_exit_compress(void);
  
  int btrfs_compress_pages(int type, struct address_space *mapping,
  			 u64 start, unsigned long len,
  			 struct page **pages,
  			 unsigned long nr_dest_pages,
  			 unsigned long *out_pages,
  			 unsigned long *total_in,
  			 unsigned long *total_out,
  			 unsigned long max_out);
  int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
  		     unsigned long start_byte, size_t srclen, size_t destlen);
  int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
  			      unsigned long total_out, u64 disk_start,
  			      struct bio_vec *bvec, int vcnt,
  			      unsigned long *pg_index,
  			      unsigned long *pg_offset);
  
  int btrfs_submit_compressed_write(struct inode *inode, u64 start,
  				  unsigned long len, u64 disk_start,
  				  unsigned long compressed_len,
  				  struct page **compressed_pages,
  				  unsigned long nr_pages);
  int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
  				 int mirror_num, unsigned long bio_flags);
  void btrfs_clear_biovec_end(struct bio_vec *bvec, int vcnt,
  				   unsigned long pg_index,
  				   unsigned long pg_offset);
  struct btrfs_compress_op {
  	struct list_head *(*alloc_workspace)(void);
  
  	void (*free_workspace)(struct list_head *workspace);
  
  	int (*compress_pages)(struct list_head *workspace,
  			      struct address_space *mapping,
  			      u64 start, unsigned long len,
  			      struct page **pages,
  			      unsigned long nr_dest_pages,
  			      unsigned long *out_pages,
  			      unsigned long *total_in,
  			      unsigned long *total_out,
  			      unsigned long max_out);
  
  	int (*decompress_biovec)(struct list_head *workspace,
  				 struct page **pages_in,
  				 u64 disk_start,
  				 struct bio_vec *bvec,
  				 int vcnt,
  				 size_t srclen);
  
  	int (*decompress)(struct list_head *workspace,
  			  unsigned char *data_in,
  			  struct page *dest_page,
  			  unsigned long start_byte,
  			  size_t srclen, size_t destlen);
  };
  
  extern struct btrfs_compress_op btrfs_zlib_compress;
  extern struct btrfs_compress_op btrfs_lzo_compress;
  
  #endif
  