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

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Message-ID: <20070531005737.GQ25091@agk.fab.redhat.com>
Date:	Thu, 31 May 2007 01:57:37 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	David Chinner <dgc@....com>, Tejun Heo <htejun@...il.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-fsdevel@...r.kernel.org,
	Andreas Dilger <adilger@...sterfs.com>
Subject: Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote:
> What if the truth changes (as can happen with md or dm)?

You get notified in endio() that the barrier had to be emulated?
 
Alasdair
-- 
agk@...hat.com
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