From: Mikulas Patocka <mpatocka@redhat.com>
Date: Thu, 10 Dec 2009 23:52:22 +0000 (+0000)
Subject: dm io: handle empty barriers
X-Git-Tag: v2.6.33-rc1~75^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12fc0f49dc994d8d90dcf3df13f5b1ee5441288d;p=pandora-kernel.git

dm io: handle empty barriers

Accept empty barriers in dm-io.

dm-io will process empty write barrier requests just like the other
read/write requests.

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