From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 22 Jun 2009 09:12:25 +0000 (+0100)
Subject: dm snapshot: support barriers
X-Git-Tag: v2.6.31-rc1~8^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=494b3ee7d4f69210def80aecce28d08c3f0755d5;p=pandora-kernel.git

dm snapshot: support barriers

Flush support for dm-snapshot target.

This patch just forwards the flush request to either the origin or the snapshot
device.  (It doesn't flush exception store metadata.)

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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