fs/btrfs/free-space-tree.h

   1 /*
   2  * Copyright (C) 2015 Facebook.  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_TREE
  20 #define __BTRFS_FREE_SPACE_TREE
  21
  22 /*
  23  * The default size for new free space bitmap items. The last bitmap in a block
  24  * group may be truncated, and none of the free space tree code assumes that
  25  * existing bitmaps are this size.
  26  */
  27 #define BTRFS_FREE_SPACE_BITMAP_SIZE 256
  28 #define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
  29
  30 void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
  31 int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
  32 int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
  33 int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
  34 int add_block_group_free_space(struct btrfs_trans_handle *trans,
  35                                struct btrfs_fs_info *fs_info,
  36                                struct btrfs_block_group_cache *block_group);
  37 int remove_block_group_free_space(struct btrfs_trans_handle *trans,
  38                                   struct btrfs_fs_info *fs_info,
  39                                   struct btrfs_block_group_cache *block_group);
  40 int add_to_free_space_tree(struct btrfs_trans_handle *trans,
  41                            struct btrfs_fs_info *fs_info,
  42                            u64 start, u64 size);
  43 int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  44                                 struct btrfs_fs_info *fs_info,
  45                                 u64 start, u64 size);
  46
  47 /* Exposed for testing. */
  48 struct btrfs_free_space_info *
  49 search_free_space_info(struct btrfs_trans_handle *trans,
  50                        struct btrfs_fs_info *fs_info,
  51                        struct btrfs_block_group_cache *block_group,
  52                        struct btrfs_path *path, int cow);
  53 int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
  54                              struct btrfs_fs_info *fs_info,
  55                              struct btrfs_block_group_cache *block_group,
  56                              struct btrfs_path *path, u64 start, u64 size);
  57 int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  58                                   struct btrfs_fs_info *fs_info,
  59                                   struct btrfs_block_group_cache *block_group,
  60                                   struct btrfs_path *path, u64 start, u64 size);
  61 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
  62                                   struct btrfs_fs_info *fs_info,
  63                                   struct btrfs_block_group_cache *block_group,
  64                                   struct btrfs_path *path);
  65 int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
  66                                   struct btrfs_fs_info *fs_info,
  67                                   struct btrfs_block_group_cache *block_group,
  68                                   struct btrfs_path *path);
  69 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
  70                         struct btrfs_path *path, u64 offset);
  71
  72 #endif