linux-kernel - Re: [dm-devel] Re: Write barriers on MD RAID1

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Date:	Wed, 24 Jun 2009 08:09:17 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Neil Brown <neilb@...e.de>
Cc:	device-mapper development <dm-devel@...hat.com>,
	Ken Milmore <ken.milmore@...glemail.com>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [dm-devel] Re: Write barriers on MD RAID1

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

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