LXR linux/fs/btrfs/free-space-tree.h

   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
   9struct 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
  19void set_free_space_tree_thresholds(struct btrfs_block_group *block_group);
  20int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
  21int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
  22int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
  23int add_block_group_free_space(struct btrfs_trans_handle *trans,
  24                               struct btrfs_block_group *block_group);
  25int remove_block_group_free_space(struct btrfs_trans_handle *trans,
  26                                  struct btrfs_block_group *block_group);
  27int add_to_free_space_tree(struct btrfs_trans_handle *trans,
  28                           u64 start, u64 size);
  29int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  30                                u64 start, u64 size);
  31
  32#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  33struct btrfs_free_space_info *
  34search_free_space_info(struct btrfs_trans_handle *trans,
  35                       struct btrfs_block_group *block_group,
  36                       struct btrfs_path *path, int cow);
  37int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
  38                             struct btrfs_block_group *block_group,
  39                             struct btrfs_path *path, u64 start, u64 size);
  40int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
  41                                  struct btrfs_block_group *block_group,
  42                                  struct btrfs_path *path, u64 start, u64 size);
  43int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
  44                                  struct btrfs_block_group *block_group,
  45                                  struct btrfs_path *path);
  46int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
  47                                  struct btrfs_block_group *block_group,
  48                                  struct btrfs_path *path);
  49int free_space_test_bit(struct btrfs_block_group *block_group,
  50                        struct btrfs_path *path, u64 offset);
  51#endif
  52
  53#endif
  54