linux-kernel - Re: [PATCH 2.6.19 5/5] fs: freeze

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Message-ID: <20061115202348.GB3875@elf.ucw.cz>
Date:	Wed, 15 Nov 2006 21:23:48 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Chinner <dgc@....com>, Alasdair G Kergon <agk@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, Srinivasa DS <srinivasa@...ibm.com>,
	Nigel Cunningham <nigel@...pend2.net>
Subject: Re: [PATCH 2.6.19 5/5] fs: freeze_bdev with semaphore not mutex

Hi!

> > There's one more thing, actually.  If the on-disk data and metadata are
> > changed _after_ the sync we do and _before_ we create the snapshot image,
> > and the subsequent  resume fails,
> 
> Well, but this is equivalent to a power failure immediately after the sync, so
> there _must_ be a way to recover the filesystem from that, no?

Exactly.

> I think I'll prepare a patch for freezing the work queues and we'll see what
> to do next.

Thanks!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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