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https://github.com/kdave/btrfs-progs
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33a21e7578
The existing attempt for changing csum types is as the following: - Create a new temporary csum root - Generate new data csums into the temporary csum root - Drop the old csum tree and make the temporary one as csum root - Change the checksums for metadata in-place Unfortunately after some experiments, the csum root switch method has a big pitfall, the backref items in extent tree. Those backref items still point back to the old tree, meaning without a lot of extra tricks, the extent tree would be corrupted. Thus we have to go a new single tree variant: - Generate new data csums into the csum root The new data csums would have a different objectid to distinguish them. - Drop the old data csum items - Change the key objectids of the new csums - Change the checksums for metadata in-place This means unfortunately we have to revert most of the old code, and update the temporary item format. The new temporary item would only record the target csum type. At every stage we have a method to determine the progress, thus no need for an item, but in the future it's still open for change. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/*
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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_TUNE_H__
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#define __BTRFS_TUNE_H__
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#include <uuid/uuid.h>
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struct btrfs_root;
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struct btrfs_fs_info;
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int update_seeding_flag(struct btrfs_root *root, const char *device, int set_flag, int force);
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int check_unfinished_fsid_change(struct btrfs_fs_info *fs_info,
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uuid_t fsid_ret, uuid_t chunk_id_ret);
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int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str);
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int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string);
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int convert_to_bg_tree(struct btrfs_fs_info *fs_info);
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int convert_to_extent_tree(struct btrfs_fs_info *fs_info);
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int btrfs_change_csum_type(struct btrfs_fs_info *fs_info, u16 new_csum_type);
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#endif
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