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73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
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/*
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* Copyright (C) 2015 Facebook. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_FREE_SPACE_TREE
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#define __BTRFS_FREE_SPACE_TREE
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/*
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* The default size for new free space bitmap items. The last bitmap in a block
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* group may be truncated, and none of the free space tree code assumes that
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* existing bitmaps are this size.
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*/
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#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
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#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
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void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
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int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
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int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
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int add_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group);
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int remove_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group);
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int add_to_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 start, u64 size);
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int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 start, u64 size);
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/* Exposed for testing. */
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struct btrfs_free_space_info *
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search_free_space_info(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path, int cow);
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int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path, u64 start, u64 size);
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int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path, u64 start, u64 size);
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int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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int free_space_test_bit(struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path, u64 offset);
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#endif
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