linux-kernel - Re: [PATCH] aoe: end barrier bios with EOPNOTSUPP

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Date:	Wed, 9 Sep 2009 18:08:04 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ed Cashin <ecashin@...aid.com>
Cc:	ecashin@...aid.com, jens.axboe@...cle.com,
	akpm@...ux-foundation.org, apw@...onical.com,
	bonbons@...ux-vserver.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] aoe: end barrier bios with EOPNOTSUPP

> The bio in question is a barrier.  Jens Axboe suggested that such bios
> need to be recognized and ended with -EOPNOTSUPP by any driver that
> provides its own ->make_request_fn handler and does not handle
> barriers.
> 
> In testing the changes below eliminate the BUG.

Presumably AoE should actually issue an ATA cache flush for this case ?

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