linux-kernel - Re: [GIT PULL] convert DRBD to REQ

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Message-ID: <20101023112159.GA23540@lst.de>
Date:	Sat, 23 Oct 2010 13:21:59 +0200
From:	Christoph Hellwig <hch@....de>
To:	Philipp Reisner <philipp.reisner@...bit.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Christoph Hellwig <hch@....de>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] convert DRBD to REQ_FLUSH/FUA

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.

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