Btrfs: use helper to simplify lock/unlock pages
Since we have a helper to set page bits, let lock_delalloc_pages and __unlock_for_delalloc use it. Signed-off-by:Liu Bo <bo.li.liu@oracle.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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