btrfs: zoned: use greedy gc for auto reclaim
Currently auto reclaim of unusable zones reclaims the block-groups in the order they have been added to the reclaim list. Change this to a greedy algorithm by sorting the list so we have the block-groups with the least amount of valid bytes reclaimed first. Note: we can't splice the block groups from reclaim_bgs to let the sort happen outside of the lock. The block groups can be still in use by other parts eg. via bg_list and we must hold unused_bgs_lock while processing them. Signed-off-by:Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by:
David Sterba <dsterba@suse.com> [ write note and comment why we can't splice the list ] Signed-off-by:
David Sterba <dsterba@suse.com>
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813ebc16
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