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Date: Wed, 07 Nov 2001 14:59:20 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: Mike Fedyk <mfedyk@matchmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: ext3 vs resiserfs vs xfs
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Mike Fedyk wrote:
> 
> On Wed, Nov 07, 2001 at 02:00:53PM -0800, Andrew Morton wrote:
> > Mike Fedyk wrote:
> > >
> > > I have a switch "data=journal" that ext2 will choke on when I boot into an
> > > ext2 only kernel.
> > >
> > > Is there another way to change the journaling mode besides modifying
> > > /etc/fstab?
> >
> > Try  adding `rootflags=data=journal' to your kernel boot
> > commandline.
> >
> 
> Oh, JOY!
> 
> adding that line to an ext2 only kernel will make it kernel panic when it
> tries to mount root because it doesn't understand the option!
> 

It's dumb that an unrecognised option be a fatal error.  Same
problem with modules, actually.  If you add a new module option
to modules.conf and then go back to an older kernel your module
won't load (here's where kaos pokes me with the rtfm stick).

You can create a second entry in lilo.conf which refers to the same
kernel image, but which doesn't have the rootflags option.

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