Re: [PATCH] block: silently error unsupported empty barriers too

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Subject: Re: [PATCH] block: silently error unsupported empty barriers too
From: Alasdair G Kergon <agk@xxxxxxxxxx>
Date: Thu, 6 Aug 2009 12:45:50 +0100
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, device-mapper development <dm-devel@xxxxxxxxxx>, Mikulas Patocka <mpatocka@xxxxxxxxxx>, Jens Axboe <jens.axboe@xxxxxxxxxx>
In-reply-to: <1249557257.3721.55.camel@blaa>
Mail-followup-to: Mark McLoughlin <markmc@xxxxxxxxxx>, device-mapper development <dm-devel@xxxxxxxxxx>, Jens Axboe <jens.axboe@xxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Mikulas Patocka <mpatocka@xxxxxxxxxx>
Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE.
References: <1249557257.3721.55.camel@blaa>
Reply-to: device-mapper development <dm-devel@xxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)

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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Follow-Ups:
- Re: [PATCH] block: silently error unsupported empty barriers too
  - From: Mikulas Patocka
- Re: [PATCH] block: silently error unsupported empty barriers too
  - From: Christoph Hellwig

References:
- [PATCH] block: silently error unsupported empty barriers too
  - From: Mark McLoughlin

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