From: Joe Thornber <ejt@redhat.com>
Date: Fri, 10 Oct 2014 08:41:09 +0000 (+0100)
Subject: dm thin: grab a virtual cell before looking up the mapping
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~126^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c822ed967cba38505713d59ed40a114386ef6c01;p=pandora-kernel.git

dm thin: grab a virtual cell before looking up the mapping

Avoids normal IO racing with discard.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
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