linux-ext4 - Re: ext4 fails on ext2 filesystems

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Message-ID: <20090120135612.GB2287@alea.gnuu.de>
Date:	Tue, 20 Jan 2009 14:56:12 +0100
From:	Jörg Sommer <joerg@...a.gnuu.de>
To:	Andreas Dilger <adilger@....com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 fails on ext2 filesystems

Hello Andreas,

Andreas Dilger schrieb am Tue 20. Jan, 07:30 (+0800):
> On Jan 18, 2009  02:35 +0100, J�rg Sommer wrote:
> > I've an ext2 filesystem as root filesystem, because it's mounted readonly
> > for the most part. I've built in the support for ext[234] in the kernel.
> > Ext4 takes precedence over ext2 and it mounts the root filesystem:
> 
> Hmm, probably an unintended consequence of the newly-added patch to
> allow ext4 to mount ext2 filesystems.
> 
> > But when remounting the filesystem read/write and changing a file, the
> > changes are written to the filesystem, but it's remounted readonly
> > immediatly. I've set the mount option remount-ro.
> > 
> > [  203.082300] EXT4 FS on hda3, no journal
> > [  205.746713] EXT4-fs error (device hda3): ext4_free_data: circular indirect block detected, inode=165056, block=184476
> 
> > motherboard	: PowerBook6,3 MacRISC3 Power Macintosh
> 
> Hmm, looks like it might be a bug in the endian conversion?

Or an unsigned vs. signed char bug? Can I somehow help you hunting the
bug? How can I mount my rootfs with ext4 on 2.6.28. Maybe this bug isn't
in this version.

Bye, Jörg.
-- 
$ cat /dev/random
#!/usr/bin/perl -WT
print "hello world\n";

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