/*
   * Copyright (C) 2007 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 __DISKIO__
  #define __DISKIO__

  #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)

  #define BTRFS_SUPER_INFO_SIZE 4096

  
  #define BTRFS_SUPER_MIRROR_MAX	 3
  #define BTRFS_SUPER_MIRROR_SHIFT 12
  
  static inline u64 btrfs_sb_offset(int mirror)
  {
  	u64 start = 16 * 1024;
  	if (mirror)
  		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  	return BTRFS_SUPER_INFO_OFFSET;
  }

  struct btrfs_device;

  struct btrfs_fs_devices;

  struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,

  				      u32 blocksize, u64 parent_transid);
  int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  			 u64 parent_transid);

  int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  			 int mirror_num, struct extent_buffer **eb);

  struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,

  						   u64 bytenr, u32 blocksize);

  int clean_tree_block(struct btrfs_trans_handle *trans,

  		     struct btrfs_root *root, struct extent_buffer *buf);

  struct btrfs_root *open_ctree(struct super_block *sb,

  			      struct btrfs_fs_devices *fs_devices,
  			      char *options);

  int close_ctree(struct btrfs_root *root);

  int write_ctree_super(struct btrfs_trans_handle *trans,

  		      struct btrfs_root *root, int max_mirrors);
  struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);

  int btrfs_commit_super(struct btrfs_root *root);

  int btrfs_error_commit_super(struct btrfs_root *root);

  struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,

  					    u64 bytenr, u32 blocksize);

  struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,

  					       struct btrfs_key *location);

  struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
  					      struct btrfs_key *location);

  int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);

  void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);

  void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);

  int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);

  void btrfs_mark_buffer_dirty(struct extent_buffer *buf);

  int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);

  int btrfs_set_buffer_uptodate(struct extent_buffer *buf);

  int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);

  u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
  void btrfs_csum_final(u32 crc, char *result);

  int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  			int metadata);

  int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
  			int rw, struct bio *bio, int mirror_num,

  			unsigned long bio_flags, u64 bio_offset,

  			extent_submit_bio_hook_t *submit_bio_start,
  			extent_submit_bio_hook_t *submit_bio_done);

  unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);

  int btrfs_write_tree_block(struct extent_buffer *buf);
  int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);

  int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
  			     struct btrfs_fs_info *fs_info);

  int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
  		       struct btrfs_root *root);

  
  #ifdef CONFIG_DEBUG_LOCK_ALLOC

  void btrfs_init_lockdep(void);
  void btrfs_set_buffer_lockdep_class(u64 objectid,
  			            struct extent_buffer *eb, int level);

  #else

  static inline void btrfs_init_lockdep(void)
  { }
  static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
  					struct extent_buffer *eb, int level)

  {
  }
  #endif

  #endif