From: Martin Steigerwald <ms@teamix.de>
Organization: team(ix) GmbH
To: tuxonice-devel@lists.tuxonice.net, linux-kernel@vger.kernel.org
Subject: safe resuming: automatically invalidating an outdated hibernate snapshot
Date: Mon, 13 Oct 2008 12:13:45 +0200
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Cc to linux-kernel: This is mainly for tuxonice, but it might also be relev=
ant=20
for other hibernate implementations. Maybe some general mechanism for=20
checking whether an on disk snapshot of the system is current would be good=
 -=20
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=
=20
tuxonice kernel is booted accidentally? I.e. could tuxonice recognize when=
=20
the swap partition has been accessed *after* the snapshot has been written?

It happened here several times that someone booted the wrong kernel and the=
n=20
someone else booted the right one again. TuxOnIce would then resume from a=
=20
snapshot that it not up-to-date anymore. This leads to filesystem breakage =
as=20
the filesystem slab objects and other in memory structures would not=20
represent the current state of the filesystem on disk. xfs_repair did a=20
marvellous job on these occassions and I already changed menu.lst to hide t=
he=20
GRUB boot menu by default, but it would be better if this case of =20
maloperation can be intercepted.

Ciao,
=2D-=20
Martin Steigerwald - team(ix) GmbH - http://www.teamix.de
gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90

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