release/src-rt-6.x.4708/linux/linux-2.6.36/fs/btrfs/free-space-cache.h

   1 /*
   2  * Copyright (C) 2009 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_FREE_SPACE_CACHE
  20 #define __BTRFS_FREE_SPACE_CACHE
  21
  22 struct btrfs_free_space {
  23         struct rb_node offset_index;
  24         u64 offset;
  25         u64 bytes;
  26         unsigned long *bitmap;
  27         struct list_head list;
  28 };
  29
  30 int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  31                          u64 bytenr, u64 size);
  32 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  33                             u64 bytenr, u64 size);
  34 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  35                                    *block_group);
  36 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  37                                u64 offset, u64 bytes, u64 empty_size);
  38 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
  39                            u64 bytes);
  40 u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group);
  41 int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
  42                              struct btrfs_root *root,
  43                              struct btrfs_block_group_cache *block_group,
  44                              struct btrfs_free_cluster *cluster,
  45                              u64 offset, u64 bytes, u64 empty_size);
  46 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
  47 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
  48                              struct btrfs_free_cluster *cluster, u64 bytes,
  49                              u64 min_start);
  50 int btrfs_return_cluster_to_free_space(
  51                                struct btrfs_block_group_cache *block_group,
  52                                struct btrfs_free_cluster *cluster);
  53 #endif