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SubjectRe: swsusp: move resume before mounting root [diff against vanilla 2.4.9]

> > I can't do that: open deleted files.
> Tough luck. Either use the same hack as NFS, or have such files
> return -EIO for all operations and give SIGBUS for mappings.
> Maybe just refuse to suspend when there are open deleted files.
> Oh, just create a name in the filesystem root and use that.
> Something like ".8fe4a979.swsusp" would be fine. Whatever!

...and break locking and similar stuff. NFS is not as good as local

> >> NFS faces. Between the suspend and resume, filesystems may be
> >> modified in arbitrary ways.
> >
> > No, you don't want to do that. This is swsusp package, meant to
> > replace suspend-to-disk on your notebook. If you choose random
> > notebook, it will allow you to suspend to disk, but not to suspend,
> > boot X, poweron, boot Y, reboot, boot X.
> >
> > If you do what you described, you'll corrupt your filesystem. It is
> > designed that way.
> Not "If", but "When". Somebody has already posted a report of
> doing exactly that, by accident, with a 3-month-old suspension.
> The filesystems were destroyed.
> Right now, swsusp is a serious hazard.

That's why its called experimental ;-).

Currently we have "SWSUSP" signature, SWAP-FILE gets replaced with
SWSUSP on suspend, and SWAP-FILE is written back on resume. That way,
you can not resume two times from one image.

Additional safety measure could be added: on every swapon, check if
"SWSUSP" is there, and replace it with "SWAP-FILE" if so. (Currently
it says -EINVAL). That should make it pretty safe.

Of course, you'll still be able to shoot yourself in the foot even
with added "security". Just don't do it, then.
I'm "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at
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