From edf6ef59ec7ee82cadc93528229c4097b6c92a7e Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Tue, 3 May 2011 12:01:11 -0400
Subject: [PATCH] xen-blkfront: Introduce BLKIF_OP_FLUSH_DISKCACHE support.

If the backend supports the 'feature-flush-cache' mode, use that
instead of the 'feature-barrier' support.

Currently there are three backends that support the 'feature-flush-cache'
mode: NetBSD, Solaris and Linux kernel. The 'flush' option is much
light-weight version than the 'barrier' support so lets try to use as
there are no filesystems in the kernel that use full barriers anymore.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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