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Message-ID: <20070409101440.GM5967@schatzie.adilger.int>
Date: Mon, 9 Apr 2007 04:14:40 -0600
From: Andreas Dilger <adilger@...sterfs.com>
To: Eric Sandeen <sandeen@...hat.com>
Cc: Samuel Thibault <samuel.thibault@...-lyon.org>,
linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Add a norecovery option to ext3/4?
On Apr 08, 2007 22:24 -0500, Eric Sandeen wrote:
> Samuel Thibault wrote:
> >Distribution installers usually try to probe OSes for building a suited
> >grub menu. Unfortunately, mounting an ext3 partition, even in read-only
> >mode, does perform some operations on the filesystem (log recovery).
> >This is not a good idea since it may silently garbage data.
>
> Can you elaborate? Under what circumstances is log replay going to harm
> data? Do you mean that the installer mounts partitions, looking for
> what OS is installed? How is that harmful?
If that disk was actually in use on another system but just exported
via a SAN to this node you've potentially corrupted the filesystem.
It's a bad idea to just go ahead and mount filesystems that you aren't
told to mount.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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