linux-kernel - Re: document ext3 requirements

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Date:	Sat, 03 Jan 2009 22:52:38 -0500
From:	Valdis.Kletnieks@...edu
To:	Duane Griffin <duaneg@...da.com>
Cc:	Martin MOKREJŠ 
	<mmokrejs@...osome.natur.cuni.cz>, Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, tytso@....edu,
	mtk.manpages@...il.com, rdunlap@...otime.net,
	linux-doc@...r.kernel.org
Subject: Re: document ext3 requirements

On Sun, 04 Jan 2009 00:41:51 GMT, Duane Griffin said:

> I agree, it isn't a great situation. Nonetheless, it has always been
> thus for ext3, and so far we've muddled along. Unless and until we can
> replay the journal in-memory without touching the on-disk data, we are
> stuck with it.

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...

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