From 7901d14144311c930918b1222aae7611284c63eb Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Wed, 28 Jul 2010 10:49:29 -0700
Subject: [PATCH] xen/blkfront: Use QUEUE_ORDERED_DRAIN for old backends

If there's no feature-barrier key in xenstore, then it means its a fairly
old backend which does uncached in-order writes, which means ORDERED_DRAIN
is appropriate.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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