linux-kernel - Re: document ext3 requirements

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Message-ID: <20090104184040.GC17558@mit.edu>
Date:	Sun, 4 Jan 2009 13:40:40 -0500
From:	Theodore Tso <tytso@....edu>
To:	Duane Griffin <duaneg@...da.com>
Cc:	Valdis.Kletnieks@...edu,
	Martin MOKREJŠ <mmokrejs@...osome.natur.cuni.cz>,
	Pavel Machek <pavel@...e.cz>,
	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 02:24:43PM +0000, Duane Griffin wrote:
> > Is there a way using md/dm/lvm etc to make the source partition R/O and
> > replay the journal onto a CoW snapshop?  Admittedly, not easy to do inside
> > the 'mount' command itself, but at least it might be workable for LiveCD R/O
> > mounts and forensics work, where you can *tell* beforehand that's what you
> > want and can jump through setup games before doing the mount...
> 
> Yes, something like that is best practice, as I understand it. The
> LiveCD init scripts could check whether they are about to R/O mount an
> ext[34] filesystem needing recovery and either refuse with a useful
> message to the user, or even automatically create and mount a COW
> snapshot, as you described. They'd still need to warn the user though,
> since things like remounting R/W wouldn't work as expected.

So what's the use case where people want to be able to mount a
filesystem needing recovery read/only without running the journal?

	   	   	    	      	      	      	  - Ted
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