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https://github.com/kdave/btrfs-progs
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68a04bc710
With previous btrfstune support to convert to block-group-tree, it has
implemented most of the infrastructure for bi-directional conversion.
This patch will implement the remaining conversion support to go back to
extent tree.
The modification includes:
- New convert_to_extent_tree() function in btrfstune.c
It's almost the same as convert_to_bg_tree(), but with small changes:
* No need to set extra features like NO_HOLES/FST.
* Need to delete the block group tree when everything finished.
- Update btrfs_delete_and_free_root() to handle non-global roots
Currently the function can only accepts global roots (extent/csum/free
space trees)
If we pass a non-global root into the function, we will screw up
global_roots_tree and crash.
Since we're going to use btrfs_delete_and_free_root() to free block
group tree which is not a global tree, this is needed.
- New handling for half converted fs in get_last_converted_bg()
There are two cases need to be handled:
* The bg tree is already empty
We need to grab the first bg in extent tree.
Or at conversion function we will fail at grabbing the first bg.
* The bg tree is not empty
Then we need to grab the last bg in extent tree.
- Extra root switching in involved functions. This involves:
* read_converting_block_groups()
* insert_block_group_item()
* update_block_group_item()
We just need to update our target root according to the current
compat_ro and super flags.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
36 lines
1.3 KiB
C
36 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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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 rewrite_checksums(struct btrfs_fs_info *fs_info, int csum_type);
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#endif
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