btrfs: defrag: enable defrag for subpage case
With the new infrastructure which has taken subpage into consideration, now we should be safe to allow defrag to work for subpage case. 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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