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

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Message-ID: <532480951001312154g1c927b31xe0181cc301b5a28d@mail.gmail.com>
Date:	Sun, 31 Jan 2010 21:54:27 -0800
From:	Michael Rubin <mrubin@...gle.com>
To:	Thomas Kupper <thomas@...per.org>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: mount ext2/3 as ext4 - no changes to ext2/3 fs structures?

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.

mrubin
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