linux-kernel - Re: [PATCH 2/5] dm: implement REQ_FLUSH/FUA support for bio-based dm

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Message-ID: <20100901134343.GA25260@redhat.com>
Date:	Wed, 1 Sep 2010 09:43:43 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	jaxboe@...ionio.com, k-ueda@...jp.nec.com, j-nomura@...jp.nec.com,
	jamie@...reable.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	hch@....de, dm-devel@...hat.com
Subject: Re: [PATCH 2/5] dm: implement REQ_FLUSH/FUA support for bio-based dm

On Mon, Aug 30 2010 at  5:58am -0400,
Tejun Heo <tj@...nel.org> wrote:

> This patch converts bio-based dm to support REQ_FLUSH/FUA instead of
> now deprecated REQ_HARDBARRIER.
> 
> * -EOPNOTSUPP handling logic dropped.

Can you expand on _why_ -EOPNOTSUPP handling is no longer needed?  And
please at it to the final patch header.

This removal isn't unique to DM's conversion to FLUSH+FUA but I couldn't
easily find the justification for its removal in the larger 30+ patch
patchset either -- other patches are terse on the removal too.

Other than that.

Acked-by: Mike Snitzer <snitzer@...hat.com>
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