root/fs/btrfs/free-space-tree.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2015 Facebook.  All rights reserved.
   4  */
   5 
   6 #ifndef BTRFS_FREE_SPACE_TREE_H
   7 #define BTRFS_FREE_SPACE_TREE_H
   8 
   9 struct btrfs_caching_control;
  10 
  11 /*
  12  * The default size for new free space bitmap items. The last bitmap in a block
  13  * group may be truncated, and none of the free space tree code assumes that
  14  * existing bitmaps are this size.
  15  */
  16 #define BTRFS_FREE_SPACE_BITMAP_SIZE 256
  17 #define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
  18 
  19 void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
  20 int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
  21 int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
  22 int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
  23 int add_block_group_free_space(struct btrfs_trans_handle *trans,
  24                                struct btrfs_block_group_cache *block_group);
  25 int remove_block_group_free_space(struct btrfs_trans_handle *trans,
  26                                   struct btrfs_block_group_cache *block_group);
  27 int add_to_free_space_tree(struct btrfs_trans_handle *trans,
  28                            u64 start, u64 size);
  29 int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  30                                 u64 start, u64 size);
  31 
  32 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  33 struct btrfs_free_space_info *
  34 search_free_space_info(struct btrfs_trans_handle *trans,
  35                        struct btrfs_block_group_cache *block_group,
  36                        struct btrfs_path *path, int cow);
  37 int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
  38                              struct btrfs_block_group_cache *block_group,
  39                              struct btrfs_path *path, u64 start, u64 size);
  40 int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  41                                   struct btrfs_block_group_cache *block_group,
  42                                   struct btrfs_path *path, u64 start, u64 size);
  43 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
  44                                   struct btrfs_block_group_cache *block_group,
  45                                   struct btrfs_path *path);
  46 int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
  47                                   struct btrfs_block_group_cache *block_group,
  48                                   struct btrfs_path *path);
  49 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
  50                         struct btrfs_path *path, u64 offset);
  51 #endif
  52 
  53 #endif