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1d6a4fc857
Previously clear_cache mount option would simply disable free-space-tree feature temporarily then re-enable it to rebuild the whole free space tree. But this is problematic for block-group-tree feature, as we have an artificial dependency on free-space-tree feature. If we go the existing method, after clearing the free-space-tree feature, we would flip the filesystem to read-only mode, as we detect a super block write with block-group-tree but no free-space-tree feature. This patch would change the behavior by properly rebuilding the free space tree without disabling this feature, thus allowing clear_cache mount option to work with block group tree. Now we can mount a filesystem with block-group-tree feature and clear_mount option: $ mkfs.btrfs -O block-group-tree /dev/test/scratch1 -f $ sudo mount /dev/test/scratch1 /mnt/btrfs -o clear_cache $ sudo dmesg -t | head -n 5 BTRFS info (device dm-1): force clearing of disk cache BTRFS info (device dm-1): using free space tree BTRFS info (device dm-1): auto enabling async discard BTRFS info (device dm-1): rebuilding free space tree BTRFS info (device dm-1): checking UUID tree CC: stable@vger.kernel.org # 6.1+ Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015 Facebook. All rights reserved.
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*/
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#ifndef BTRFS_FREE_SPACE_TREE_H
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#define BTRFS_FREE_SPACE_TREE_H
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struct btrfs_caching_control;
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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 *block_group);
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int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_delete_free_space_tree(struct btrfs_fs_info *fs_info);
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int btrfs_rebuild_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_block_group *block_group);
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int remove_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group);
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int add_to_free_space_tree(struct btrfs_trans_handle *trans,
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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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u64 start, u64 size);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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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_block_group *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_block_group *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_block_group *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_block_group *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_block_group *block_group,
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struct btrfs_path *path);
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int free_space_test_bit(struct btrfs_block_group *block_group,
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struct btrfs_path *path, u64 offset);
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#endif
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#endif
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