From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Dilger Subject: Re: Mounting Ext3 with Ext4 Date: Thu, 21 May 2009 01:01:46 -0400 Message-ID: <20090521050146.GC8744@webber.adilger.int> References: <4A14ABAC.7040901@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; CHARSET=US-ASCII Content-Transfer-Encoding: 7BIT Cc: Eric Sandeen , linux-ext4@vger.kernel.org To: Matt LaPlante Return-path: Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:33007 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750719AbZEUFBs (ORCPT ); Thu, 21 May 2009 01:01:48 -0400 Received: from fe-sfbay-10.sun.com ([192.18.43.129]) by sca-es-mail-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id n4L51njR004385 for ; Wed, 20 May 2009 22:01:49 -0700 (PDT) Content-disposition: inline Received: from conversion-daemon.fe-sfbay-10.sun.com by fe-sfbay-10.sun.com (Sun Java(tm) System Messaging Server 7u2-7.02 64bit (built Apr 16 2009)) id <0KJZ00I009SXRZ00@fe-sfbay-10.sun.com> for linux-ext4@vger.kernel.org; Wed, 20 May 2009 22:01:49 -0700 (PDT) In-reply-to: Sender: linux-ext4-owner@vger.kernel.org List-ID: 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.