From: Joe Thornber <ejt@redhat.com>
Date: Thu, 27 Nov 2014 12:21:08 +0000 (+0000)
Subject: dm cache: only use overwrite optimisation for promotion when in writeback mode
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~22^2~6
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f29a3147e251d7ae20d3194ff67f109d71e501b4;p=pandora-kernel.git

dm cache: only use overwrite optimisation for promotion when in writeback mode

Overwrite causes the cache block and origin blocks to diverge, which
is only allowed in writeback mode.

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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