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

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Date:	Wed, 30 May 2007 11:41:15 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	Stefan Bader <sbader3@...glemail.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	David Chinner <dgc@....com>, Phillip Susi <psusi@....rr.com>,
	Stefan Bader <Stefan.Bader@...ibm.com>,
	Andreas Dilger <adilger@...sterfs.com>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

On Wed, May 30, 2007 at 11:12:37AM +0200, Stefan Bader wrote:
> it might be better to indicate -EOPNOTSUPP right from
> device-mapper.
 
Indeed we should.  For support, on receipt of a barrier, dm core should
send a zero-length barrier to all active underlying paths, and delay
mapping any further I/O.

Alasdair
-- 
agk@...hat.com
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