Re: [RFC] userland swsusp

[Stefan Rompf]

Pavel Machek wrote:

> This is prototype of userland swsusp. I'd like kernel parts to go in,
> probably for 2.6.16. Now, I'm not sure about the interface, ioctls are
> slightly ugly, OTOH it would be probably overkill to introduce
> syscalls just for this. (I'll need to add an ioctl for freeing memory
> in future).

I'm curious on the restrictions the userspace part would have to accept.
Can /usr/swsusp.c write to a file? Currently, you allow it, but I doubt
whether it would be wise to write to a file after you've snapshotted
kernel's filesystem state. OTOH, I don't want to reserve a partition just
for the image. Can userspace allocate memory after ioctl(SYS_FREEZE)?

I have userspace supported encryption of the image in mind.

Stefan
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