tree bb40893166dc8cd1d0f84c8087d021b66774a007
parent 9c5091f2eeeffe5eca2ffe8a1bc28d312c8a5083
author Mike Snitzer <snitzer@redhat.com> 1356121416 +0000
committer Alasdair G Kergon <agk@redhat.com> 1356121416 +0000

dm: prepare to support WRITE SAME

Allow targets to opt in to WRITE SAME support by setting
'num_write_same_requests' in the dm_target structure.

A dm device will only advertise WRITE SAME support if all its
targets and all its underlying devices support it.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>