linux-kernel - Re: document ext3 requirements

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Message-Id: <200901061320.29732.rob@landley.net>
Date:	Tue, 6 Jan 2009 13:20:27 -0600
From:	Rob Landley <rob@...dley.net>
To:	Theodore Tso <tytso@....edu>
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 Monday 05 January 2009 13:16:58 Theodore Tso wrote:
> 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:

Well I managed to kill it more than once, but I could easily have the 
reproduction sequence wrong.  (I wasn't _trying_ to do it again...)

> # 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

If I can figure out what I did, I'll get back to you.

>    	     		 	  	       		 - Ted

Rob
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