Mike Snitzer 3dba53a958 dm thin: use __blkdev_issue_discard for async discard support
With commit 38f25255330 ("block: add __blkdev_issue_discard") DM thinp
no longer needs to carry its own async discard method.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2016-05-13 09:03:52 -04:00
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