From: Tejun Heo <tj@kernel.org>
Date: Fri, 28 Nov 2008 04:32:07 +0000 (+0900)
Subject: block: fix empty barrier on write-through w/ ordered tag
X-Git-Tag: v2.6.29-rc1~569^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a185eb4bc84155fff35b602ce99602c010de9634;p=pandora-kernel.git

block: fix empty barrier on write-through w/ ordered tag

Empty barrier on write-through (or no cache) w/ ordered tag has no
command to execute and without any command to execute ordered tag is
never issued to the device and the ordering is never achieved.  Force
draining for such cases.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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