linux-kernel - Re: document ext3 requirements

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Date:	Sun, 4 Jan 2009 14:24:43 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	Valdis.Kletnieks@...edu
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

2009/1/4  <Valdis.Kletnieks@...edu>:
> 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...

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.

Cheers,
Duane.

-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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