btrfs: introduce extent allocation policy
This commit introduces extent allocation policy for btrfs. This policy controls how btrfs allocate an extents from block groups. There is no functional change introduced with this commit. Reviewed-by:Josef Bacik <josef@toxicpanda.com> Signed-off-by:
Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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6aafb303
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