linux-kernel - Re: Add a norecovery option to ext3/4?

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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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