From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 21 Dec 2012 20:23:36 +0000 (+0000)
Subject: dm: prepare to support WRITE SAME
X-Git-Tag: v3.8-rc1~3^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d54eaa5a0fde0a202e4e91f200f818edcef15bee;p=pandora-kernel.git

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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