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

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Message-ID: <20061109160003.GA24156@elf.ucw.cz>
Date:	Thu, 9 Nov 2006 17:00:03 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	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>,
	David Chinner <dgc@....com>
Subject: Re: [PATCH 2.6.19 5/5] fs: freeze_bdev with semaphore not mutex

Hi!

> > > Well, it looks like the interactions with dm add quite a bit of
> > > complexity here.
> > 
> > What about just fixing xfs (thou shall not write to disk when kernel
> > threads are frozen), and getting rid of blockdev freezing?
> 
> Well, first I must admit you were absolutely right being suspicious with
> respect to this stuff.

(OTOH your patch found real bugs in suspend.c, so...)

> OTOH I have no idea _how_ we can tell xfs that the processes have been
> frozen.  Should we introduce a global flag for that or something?

I guess XFS should just do all the writes from process context, and
refuse any writing when its threads are frozen... I actually still
believe it is doing the right thing, because you can't really write to
disk from timer.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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