linux-kernel - Re: [TuxOnIce-devel] safe resuming: automatically invalidating an outdated hibernate snapshot

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Date:	Thu, 16 Oct 2008 12:33:38 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Martin Steigerwald <ms@...mix.de>
Cc:	tuxonice-devel@...ts.tuxonice.net, linux-kernel@...r.kernel.org,
	Nigel Cunningham <ncunningham@...a.org.au>
Subject: Re: [TuxOnIce-devel] safe resuming: automatically invalidating an
	outdated hibernate snapshot

On Mon 2008-10-13 13:35:25, Martin Steigerwald wrote:
> Am Montag, 13. Oktober 2008 schrieben Sie:
> > Hi Martin.
> 
> Hi Nigel,
> 
> > On Mon, 2008-10-13 at 12:13 +0200, Martin Steigerwald wrote:
> > > Cc to linux-kernel: This is mainly for tuxonice, but it might also be
> > > relevant for other hibernate implementations. Maybe some general
> > > mechanism for checking whether an on disk snapshot of the system is
> > > current would be good - as also the resume parameter could be missing or
> > > wrong or whatnot.
> > >
> > >
> > > Hi!
> > >
> > > Is there a way to automatically invalidate the tuxonice snapshot when a
> > > non tuxonice kernel is booted accidentally? I.e. could tuxonice recognize
> > > when the swap partition has been accessed *after* the snapshot has been
> > > written?
> 
> [...]
> 
> > The simplest way is to mkswap the appropriate partitions from a script
> > run when booting (after we check whether to resume, of course). I
> > believe the hibernate script already has support for this. Maybe
> > pm-utils or such like needs it too?
> 
> Simple idea. But I dislike automatically formatting a partition on each boot. 
> What if the user changes the partition layout and forgets to adapt
> swap 

Simple solution: add --only-mkswap-when-its-hibernation-image option
to mkswap.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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