From be2f8373c188ed1f5d36003c9928e4d695213080 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Tue, 2 Nov 2010 10:38:33 -0400
Subject: [PATCH] xen/blkfront: Implement FUA with BLKIF_OP_WRITE_BARRIER

The BLKIF_OP_WRITE_BARRIER is a full ordered barrier, so we can use it
to implement FUA as well as a plain FLUSH.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Christoph Hellwig <hch@lst.de>
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