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Date: Sat, 23 Oct 2010 13:21:59 +0200
From: Christoph Hellwig <hch@lst.de>
To: Philipp Reisner <philipp.reisner@linbit.com>
Cc: Jens Axboe <jaxboe@fusionio.com>, Christoph Hellwig <hch@lst.de>,
        linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL] convert DRBD to REQ_FLUSH/FUA
Message-ID: <20101023112159.GA23540@lst.de>
References: <1281977523-19335-1-git-send-email-tj@kernel.org> <201008241745.35242.philipp.reisner@linbit.com> <20101022083511.GA7853@lst.de> <201010231318.33517.philipp.reisner@linbit.com>
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On Sat, Oct 23, 2010 at 01:18:33PM +0200, Philipp Reisner wrote:
> Hi Jens,
> 
> Christoph Hellwig pointed out that drbd is the only driver
> that still uses/supports barriers instead of FUE in linux-next.
> 
> I revitalized three patches that remove the barrier bits from DRBD...

This looks good.  You probably don't actually need the MD_NO_FUA flag -
REQ_FUA writes will always work - they just ignored by drivers not
implementing cache control.