btrfs: introduce chunk allocation policy
Introduce chunk allocation policy for btrfs. This policy controls how chunks and device extents are allocated from devices. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NNaohiro Aota <naohiro.aota@wdc.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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