Re: [Swsusp-devel] Re: [PATCH] Allow initrd_load() before software_resume() (version 2)

Pavel Machek
2003-08-11T15:29:59Z

Hi!

> > >> > > Okay. I hadn't tried it yet. I'll happily take up the barrow for you
> > >> > > and push it to Pavel and Linus with the rest, if you like.
> > >> >
> > >> > Don't even think about that.
> > >> >
> > >> > It is not safe to run userspace *before* doing resume. You don't want
> > >> > to see problems this would bring in. Forget it.
> > >>
> > >> so how do you resume from a partition on a device mapper volume?
> > >>
> > >> (and yes I basically agree with your sentiment though)
> > >
> > > I know very little about DM, its very well possible that resume from
> > > it is not supported.
> >
> > Since DM requires some userspace program to set up the mappings, it
> > seems to me that it wouldn't work to resume from a DM volume. I'd
> > much appreciate if it would work, somehow.
>
> Er, query:
>
> At some point in the vague nebulous future, after initrd has become initramfs,
> the partition detection code is scheduled to be ripped out, correct? And
> replaced with a userspace thing run out of initrd ala hotplug and udev and
> all that?
>
> So at that point, it's not just device mapper that's going to need something
> else to run in userspace to attach block devices to partitions. Everything
> will.
>
> So are you saying that swsusp is a short-term thing that will be dropped in
> 2.8 because it can't be made to work? Or that we WILL have to deal with this
> at some point, just not yet?

At that point we'll have to carefully audit all userland code that can
run before software resume.
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]