linux-kernel - Re: [dm-devel] [PATCH] block: silently error unsupported empty barriers too

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Message-ID: <20090806114550.GL29899@agk-dp.fab.redhat.com>
Date:	Thu, 6 Aug 2009 12:45:50 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	device-mapper development <dm-devel@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [dm-devel] [PATCH] block: silently error unsupported empty
	barriers too

On Thu, Aug 06, 2009 at 12:14:17PM +0100, Mark McLoughlin wrote:
> We should error all barriers, even empty barriers, on devices like
> virtio_blk which don't support them.
 
Have you considered whether or not virtio_blk actually needs to
support empty barriers?

Alasdair

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