linux-kernel - Re: Kernel 2.6.30.4 loop(..?) regression (& with/2.6.31-rc6)

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Date:	Fri, 28 Aug 2009 12:55:26 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Nikanth Karthikesan <knikanth@...e.de>, xfs@....sgi.com,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: Kernel 2.6.30.4 loop(..?) regression (& with/2.6.31-rc6)

On Fri, Aug 28, 2009 at 07:23:11AM -0400, Justin Piszcz wrote:
> If both '-o nobarrier' and the patch solves the issue, what is the next  
> action that should be taken?  Update the documentation to always use
> -o nobarrier for cryptoloop? Or get the patch reverted in mainline?

We'll have to figure out why it causes those problems and how fix them.
-o nobarrier on a loop device is extremly unsafe as you will possible
lose large amounts of log updates in case of a crash.

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