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

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Date:	Wed, 26 Aug 2009 17:31:06 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Christoph Hellwig <hch@...radead.org>
cc:	Nikanth Karthikesan <knikanth@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: Kernel 2.6.30.4 loop(..?) regression (& with/2.6.31-rc6)



On Wed, 26 Aug 2009, Christoph Hellwig wrote:

> On Wed, Aug 26, 2009 at 05:19:11PM -0400, Justin Piszcz wrote:
>> For the root filesystem, on / type xfs (rw,noatime)
>> For larger partitions (per the cryptoloop doc) the partition itself is
>> setup via cryptoloop and then XFS ontop of that.  Nothing special.
>
> Just to make sure we have all data here - you see the problem only
> with loop devices backed by XFS, only with loop devices backed by
> raw partitions or with both?
Both.

>
>>> Any way to trgiger it with just loop but not crypto, etc.
>> Unfortunately not that I am aware of..  Would trying the kernel with the
>> patch removed and mounted with -o nobarrier help to show us anything, or?
>
> Actually, yes - seeing what happens if you run plain 2.6.30 or 2.6.31-rc
> without the backout patch, but with -o nobarrier would be very
> interesting.
>
Will give it a try with 2.6.31-rc6 and mount all loop devices (both those 
backed by XFS and raw partitions) with -o nobarrier to see if the problem 
recurs.  So far though with that patch up until this next test, there were 
no problems.

Justin.

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