From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alasdair G Kergon <agk@redhat.com>
Subject: Re: Re: Write barriers on MD RAID1
Date: Wed, 24 Jun 2009 08:09:17 +0100
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To: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Ken Milmore <ken.milmore@googlemail.com>, device-mapper development <dm-devel@redhat.com>, Mikulas Patocka <mpatocka@redhat.com>, Jens Axboe <jens.axboe@oracle.com>
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On Wed, Jun 24, 2009 at 01:43:35PM +1000, Neil Brown wrote:
> Since this test was added, barriers have not worked on md, and (I
> think) dm and similar devices that don't use __make_request and so
> don't bother to set next_ordered.
 
In dm, we added this:

+       blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);

Alasdair