From: Joe Thornber <ejt@redhat.com>
Date: Fri, 27 Jul 2012 14:08:06 +0000 (+0100)
Subject: dm thin: avoid unnecessarily breaking sharing for flushes
X-Git-Tag: v3.6-rc1~56^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=600497013687516153cb82637acfe56f7eb9308a;p=pandora-kernel.git

dm thin: avoid unnecessarily breaking sharing for flushes

There's no need to break sharing, triggering a copy, for a write that has no
data (i.e. a flush).

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