On Monday, 30 October 2006 12:08, Stefan Seyfried wrote:
> On Mon, Oct 30, 2006 at 11:57:47AM +0100, Rafael J. Wysocki wrote:
> > On Monday, 30 October 2006 09:37, Stefan Seyfried wrote:
> > > On Mon, Oct 30, 2006 at 12:20:50AM +0100, Rafael J. Wysocki wrote:
> > > > Hi,
> > > >
> > > > Unfortunately in its current form s2disk causes the access time of the
> > > > resume
> > > > device special file to be updated after the suspend image has been
> > > > created,
> > > > which is potentially dangerous.
> > > >
> > > > We can fix this by mounting a tmpfs, creating the special device file
> > > > on it
> > > > and using this file for the suspend, which is done in the appended
> > > > patch.
> > >
> > > But the access time of the device on the tmpfs will also be corrupt, and
> > > the
> > > kernel may go "boom" when unmounting that tmpfs (just theoretical, but
> > > maybe
> > > the cure is worse than the disease)?
> >
> > No. tmpfs is in RAM. ;-)
>
> Well, but if some data structures are different than the tmpfs driver thinks
> they are, the kernel could oops/panic at umount, couldn't it?
Yes, it could, but they won't be. After a successful resume the tmpfs will
be in the same state as before the suspend, won't it?
[The problem with disk filesystems is they tend to preserve data across the
suspend-resume cycle. ;-)]
> And today, /dev/ is on tmpfs also :-)
Well, I tested this on a box with /dev/ on ext3. ;-)
--
You never change things by fighting the existing reality.
R. Buckminster Fuller
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