linux-kernel - Re: MMC/SD Root filesystem suspend/resume problems

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Message-ID: <20070725224710.GB8950@elf.ucw.cz>
Date:	Thu, 26 Jul 2007 00:47:10 +0200
From:	Pavel Machek <pavel@....cz>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Pierre Ossman <drzeus-mmc@...eus.cx>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: MMC/SD Root filesystem suspend/resume problems

On Wed 2007-07-25 20:20:42, Richard Purdie wrote:
> On Wed, 2007-07-25 at 19:01 +0000, Pavel Machek wrote:
> > > I enabled the MMC_UNSAFE_RESUME option and the problems I was seeing was
> > > "fixed". I think having this option is a bad idea (in its current form)
> > > as it doesn't actually stop filesystem corruption.
> > > 
> > > With the option disabled, if a filesystem is mounted when you suspend my
> > > tests show the filesystem is corrupted. At least if the option is
> > > enabled, the filesystem is only corrupted if you remove the card whilst
> > > suspended which is more preferable.
> > 
> > Are we talking _corruption_ here, or are we talking 'the kind of
> > corruption recoverable by fsck that happens on powerfail'?
> 
> There was more damage to the system than just a dirty bit set. Yes, fsck
> could fix it but I don't think it should happen in the first place...

Well, that's "ok", that happens on sudden powerdowns, too.

(Well, but we do sync() during suspend, so it is a bit strange). Do
you have fsck logs perhaps?
									Pavel

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