linux-kernel - Re: [dm-devel] Barriers still not passing on simple dm devices...

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Message-ID: <20090409102851.GT5688@agk.fab.redhat.com>
Date:	Thu, 9 Apr 2009 11:28:51 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	ak@...ux.intel.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [dm-devel] Barriers still not passing on simple dm devices...

On Wed, Apr 08, 2009 at 09:27:20PM -0400, Chris Mason wrote:
> I'm afraid expecting barriers forever in the future isn't completely
> compatible with dm or md.  Both of these allow the storage to change
> over time, and the filesystem needs to handle this without corruptions.
 
The missing piece of the jigsaw is notification to upper layers *ahead*
of such reconfigurations.  (We have similar notification issues when
devices are resized - the current approach is to leave the sysadmin
responsible for co-ordinating changes through userspace.)

Alasdair
-- 
agk@...hat.com
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