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

To: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject: Re: Kernel 2.6.30.4 loop(..?) regression (& with/2.6.31-rc6)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 17:27:32 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Nikanth Karthikesan <knikanth@xxxxxxx>, Jens Axboe <jens.axboe@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.2.00.0908261717001.1594@xxxxxxxxxxxxxxxx>
References: <alpine.DEB.2.00.0908221044420.30321@xxxxxxxxxxxxxxxx> <20090822201558.GA17955@xxxxxxxxxxxxx> <alpine.DEB.2.00.0908221645440.20848@xxxxxxxxxxxxxxxx> <20090822205502.GA18904@xxxxxxxxxxxxx> <alpine.DEB.2.00.0908221659030.23463@xxxxxxxxxxxxxxxx> <20090823224504.GA19942@xxxxxxxxxxxxx> <alpine.DEB.2.00.0908240704130.9427@xxxxxxxxxxxxxxxx> <alpine.DEB.2.00.0908260949550.9396@xxxxxxxxxxxxxxxx> <20090826180234.GC14019@xxxxxxxxxxxxx> <alpine.DEB.2.00.0908261717001.1594@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
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?

>> 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.

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