linux-ext4 - Re: mount ext2/3 as ext4 - no changes to ext2/3 fs structures?

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Message-Id: <0081ACB2-54C6-4AE5-B55F-CEAF299CFC7A@kupper.org>
Date:	Wed, 3 Feb 2010 16:18:25 +0100
From:	Thomas Kupper <thomas@...per.org>
To:	Michael Rubin <mrubin@...gle.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: mount ext2/3 as ext4 - no changes to ext2/3 fs structures?

On 1 Feb 2010, at 06:54, Michael Rubin wrote:

> On Sun, Jan 31, 2010 at 2:31 PM, Thomas Kupper <thomas@...per.org> wrote:
>> Consider the following scenario: Assume I have a partition formated with ext2 on a computer with some 2.4.x kernel. Now I mount this ext2 partition on another computer as ext4 using a 2.6.29+ kernel. After that I take the disk back to the older computer and mount the ext2 on the 2.4.x kernel with the ext2 driver.
> 
> I have seen this work as long as you don't add the "extents" or other
> ext4 specific mount options. Our kernels are not quite as up to date
> as 2.6.29 and we have not done extensive testing with that kernel. Not
> sure anyone has tested this case thoroughly.

Thanks alot for your answer, that'll do for me to start with. Nothing on computers is guaranteed to work perfect :)

> mrubin

Cheers,
Thomas--
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