/*
   * Copyright (C) 2009 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_FREE_SPACE_CACHE
  #define __BTRFS_FREE_SPACE_CACHE

  struct btrfs_free_space {
  	struct rb_node offset_index;
  	u64 offset;
  	u64 bytes;
  	unsigned long *bitmap;
  	struct list_head list;
  };

  struct btrfs_free_space_ctl {
  	spinlock_t tree_lock;
  	struct rb_root free_space_offset;
  	u64 free_space;
  	int extents_thresh;
  	int free_extents;
  	int total_bitmaps;
  	int unit;
  	u64 start;
  	struct btrfs_free_space_op *op;
  	void *private;
  };
  
  struct btrfs_free_space_op {
  	void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
  	bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
  			   struct btrfs_free_space *info);
  };

  struct inode *lookup_free_space_inode(struct btrfs_root *root,
  				      struct btrfs_block_group_cache
  				      *block_group, struct btrfs_path *path);
  int create_free_space_inode(struct btrfs_root *root,
  			    struct btrfs_trans_handle *trans,
  			    struct btrfs_block_group_cache *block_group,
  			    struct btrfs_path *path);

  int btrfs_truncate_free_space_cache(struct btrfs_root *root,
  				    struct btrfs_trans_handle *trans,
  				    struct btrfs_path *path,
  				    struct inode *inode);

  int load_free_space_cache(struct btrfs_fs_info *fs_info,
  			  struct btrfs_block_group_cache *block_group);

  int btrfs_write_out_cache(struct btrfs_root *root,
  			  struct btrfs_trans_handle *trans,
  			  struct btrfs_block_group_cache *block_group,
  			  struct btrfs_path *path);

  struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  				    struct btrfs_path *path);
  int create_free_ino_inode(struct btrfs_root *root,
  			  struct btrfs_trans_handle *trans,
  			  struct btrfs_path *path);
  int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  			struct btrfs_root *root);
  int btrfs_write_out_ino_cache(struct btrfs_root *root,
  			      struct btrfs_trans_handle *trans,
  			      struct btrfs_path *path);

  void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);

  int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
  			   u64 bytenr, u64 size);
  static inline int
  btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  		     u64 bytenr, u64 size)
  {
  	return __btrfs_add_free_space(block_group->free_space_ctl,
  				      bytenr, size);
  }

  int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  			    u64 bytenr, u64 size);

  void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);

  void btrfs_remove_free_space_cache(struct btrfs_block_group_cache

  				     *block_group);

  u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  			       u64 offset, u64 bytes, u64 empty_size);

  u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);

  void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
  			   u64 bytes);

  int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,

  			     struct btrfs_root *root,

  			     struct btrfs_block_group_cache *block_group,
  			     struct btrfs_free_cluster *cluster,
  			     u64 offset, u64 bytes, u64 empty_size);
  void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
  u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
  			     struct btrfs_free_cluster *cluster, u64 bytes,
  			     u64 min_start);
  int btrfs_return_cluster_to_free_space(
  			       struct btrfs_block_group_cache *block_group,
  			       struct btrfs_free_cluster *cluster);

  int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
  			   u64 *trimmed, u64 start, u64 end, u64 minlen);

  #endif