btrfs: reloc: use btrfs_backref_iter infrastructure

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In the core function of relocation, build_backref_tree, it needs to
iterate all backref items of one tree block.

Use btrfs_backref_iter infrastructure to do the loop and make the code
more readable.

The backref items look would be much more easier to read:

	ret = btrfs_backref_iter_start(iter, cur->bytenr);
	for (; ret == 0; ret = btrfs_backref_iter_next(iter)) {
		/* The really important work */
	}

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

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Qu Wenruo 2020-02-14 13:48:20 +08:00 • committed by David Sterba

parent c39c2ddc67

commit 71f572a9e8

1 changed files with 62 additions and 129 deletions

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fs/btrfs/relocation.c

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