dm: linear support discard
Allow discards to be passed through to linear mappings if at least one underlying device supports it. Discards will be forwarded only to devices that support them. A target that supports discards should set num_discard_requests to indicate how many times each discard request must be submitted to it. Verify table's underlying devices support discards prior to setting the associated DM device as capable of discards (via QUEUE_FLAG_DISCARD). Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Reviewed-by: NJoe Thornber <thornber@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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