linux-kernel - Re: document ext3 requirements

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Message-ID: <20090104224233.GA9531@brong.net>
Date:	Mon, 5 Jan 2009 09:42:33 +1100
From:	Bron Gondwana <brong@...tmail.fm>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Theodore Tso <tytso@....edu>, Duane Griffin <duaneg@...da.com>,
	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 08:21:06PM +0100, Geert Uytterhoeven wrote:
> On Sun, 4 Jan 2009, Theodore Tso wrote:
> > 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?
> 
> As mentioned before, suspending a laptop (running from hdd), running a live CD,
> and expecting everything to work fine when resuming from hdd?

Any particular reason why suspend doesn't run the journal during
shutdown and leave a clean filesystem?  It shouldn't take that
long surely.

I know it doesn't solve the "it really just crashed" problem, but
you don't tend to unsuspend from a crash anyway.

Bron ( just curious )
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