linux-kernel - Re: document ext3 requirements

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Message-ID: <20090105191658.GA11632@mit.edu>
Date:	Mon, 5 Jan 2009 14:16:58 -0500
From:	Theodore Tso <tytso@....edu>
To:	Rob Landley <rob@...dley.net>
Cc:	Martin MOKREJŠ <mmokrejs@...osome.natur.cuni.cz>,
	Pavel Machek <pavel@...e.cz>, Duane Griffin <duaneg@...da.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org
Subject: Re: document ext3 requirements

On Sun, Jan 04, 2009 at 01:56:32PM -0600, Rob Landley wrote:
> On Saturday 03 January 2009 17:01:58 Martin MOKREJŠ wrote:
> > > Still handy for recovering badly broken filesystems, I'd say.
> >
> > Me as well. How about improving you doc patch with some summary of
> > this thread (although it is probably not over yet)? ;-) Definitely,
> > a note that one can mount it as ext2 while read-only would be helpful
> > when doing some forensics on the disk.
> 
> Although make sure you _do_ mount it as read only because if you mount an ext3 
> filesystem read/write as ext2 I've had it zap the journal entirely and then 
> you have to tune2fs -j the sucker to turn it back into ext3.
> 
> Ext3 is... touchy.

Um.... horse pucky:

# mke2fs -q -t ext3 /dev/thunk/footest
# debugfs -R features /dev/thunk/footest
debugfs 1.41.3 (12-Oct-2008)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
# mount -t ext2 /dev/thunk/footest /mnt
# touch /mnt/foo
# umount /mnt
# debugfs -R features /dev/thunk/footest
debugfs 1.41.3 (12-Oct-2008)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype sparse_super large_file

   	     		 	  	       		 - Ted
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