linux-ext4 - Re: Mounting Ext3 with Ext4

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Date:	Thu, 21 May 2009 01:01:46 -0400
From:	Andreas Dilger <adilger@....com>
To:	Matt LaPlante <cybrmatt@...il.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: Mounting Ext3 with Ext4

On May 21, 2009  00:37 -0400, Matt LaPlante wrote:
> It looks likes the magic touch was to add rootfstype=ext4 to the
> kernel command line.  Prior to this the ext4 only kernel wasn't
> finding the disk, but with it attached it now appears to boot
> successfully.  Maybe worth adding a note to the wiki?

This means that your initrd has "ext3" as the root filesystem type
in /etc/fstab or similar.  If the filesystem type is explicitly
given as "ext3" then the ext4 driver will not try to mount it.

I suppose it might be reasonable to have a config option that adds
the "ext3" and "ext2" filesystem types to the ext4 driver for cases
like this where CONFIG_EXT2 and CONFIG_EXT3 (and module equivalents)
are disabled.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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