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Re: [dm-devel] Re: Write barriers on MD RAID1
- From: Alasdair G Kergon <agk redhat com>
- 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>
- Subject: Re: [dm-devel] Re: Write barriers on MD RAID1
- Date: Wed, 24 Jun 2009 08:09:17 +0100
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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