Message-ID: <4908C951.2000309@redhat.com>
Date: Wed, 29 Oct 2008 15:36:33 -0500
From: Eric Sandeen <sandeen@redhat.com>
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To: Arthur Jones <ajones@riverbed.com>
CC: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>, sct@redhat.com,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: ext3: slow symlink corruption on umount...
References: <20081024183733.GA25797@ajones-laptop.nbttech.com> <20081027165423.GB25797@ajones-laptop.nbttech.com> <20081029195403.GA8333@ajones-laptop.nbttech.com>
In-Reply-To: <20081029195403.GA8333@ajones-laptop.nbttech.com>
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Arthur Jones wrote:
> This one's turning out to be a slippery fish.
> I have found that the corruption appears to
> be due to ->writepage() not getting called at all
> for any of the long symlinks...
> 
> Ring any bells anyone?  Any ideas where to look
> or what to test?  This is my first foray into
> ext3 and I could definitely use some expert advice...
> 
> Arthur


Sorry for the silence, this is a nice bug you've found :)

I can reproduce this at least, with this script:

#!/bin/bash

umount /mnt/test2
mount /dev/sdb4 /mnt/test2
rm -f /mnt/test2/*
dd if=/dev/zero of=/mnt/test2/bigfile bs=1M count=512
touch
/mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
ln -s
/mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
/mnt/test2/link
umount /mnt/test2
mount /dev/sdb4 /mnt/test2
ls /mnt/test2/
umount /mnt/test2

I'll look into it ...

-Eric
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