Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

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Subject: Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
From: Alasdair G Kergon <agk@xxxxxxxxxx>
Date: Thu, 31 May 2007 02:07:39 +0100
Cc: Tejun Heo <htejun@xxxxxxxxx>, David Chinner <dgc@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, Jens Axboe <jens.axboe@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, Andreas Dilger <adilger@xxxxxxxxxxxxx>
In-reply-to: <18014.6860.989819.665778@xxxxxxxxxxxxxx>
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On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote:
> If a filesystem cares, it could 'ask' as suggested above.
> What would be a good interface for asking?

XFS already tests:
  bd_disk->queue->ordered == QUEUE_ORDERED_NONE

Alasdair
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