Messages in this thread | | | Date | Sat, 14 Jul 2007 00:37:27 +0200 (CEST) | From | Bodo Eggert <> | Subject | Re: [PATCH 0/3][try 1] init: enable system-on-initramfs |
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On Fri, 13 Jul 2007, H. Peter Anvin wrote: > Bodo Eggert wrote:
> > I toyed with setting up a diskless system in initramfs. In the process, I > > came across some things: > > > > 1) There is no way to have the kernel not mount a filesystem, > > unless you use /init or rdinit=. > > And? Just use rdinit=/sbin/init and no patch is needed.
rdinit is supposed to do a different job from /sbin/init, therefore it will not do the security callbacks the original code would do.
And besides that, it feels like turning the wrong knob for that task.
> > 2a) I figured if you prepared the root fs to contain a running system, you > > woud probably also set up a runnable system on it. Therefore I changed > > the default to boot from tmpfs if there was no /init nor a root= option. > > (If there is a /init, it will be executed as usural.) > > > > Unfortunately the way I do it, this will override the rdev setting, but > > that should be OK, since rdev is dead. Isn't it? > > That's pretty hideous. There shouldn't be a need for doing that. > > rdev, unfortunately, isn't dead -- it lives on in the form of > /proc/sys/kernel/real-root-dev, as I found out doing the klibc set.
It just missed it's own funeral: "Obsolete root change mechanism ------------------------------
The following mechanism was used before the introduction of pivot_root. Current kernels still support it, but you should _not_ rely on its continued availability." (Documentation/initrd.txt)
I don't insist on changing the default, it was just a logical step from preparing initramfs to hold a system.
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