Mike Snitzer d54eaa5a0f
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 >
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