Re: initramfs: is it supposed to work?

[hpa@zytor.com (H. Peter Anvin)]

Followup to:  <41D4A2A6.3060607@tls.msk.ru>
By author:    Michael Tokarev <mjt@tls.msk.ru>
In newsgroup: linux.dev.kernel
> 
> o And finally, when booting the "right way", using initramfs where
> /init gets executed with pid=1 and should do the same pivot_root
> and things like that, before the umount loop mentioned above,
> it looks almost right:
>   rootfs /initrd rootfs ro 0 0
>   /dev/hda1 / ext3 rw 0 0
> (this is where eg umount from busybox chokes, also entering
> endless loop.. but tha's a different story, it's an obvious
> bug in busybox.. however in order to fix it properly one have
> to know which cases like the 3 mentioned above are possible).
> 

You don't pivot_root initramfs, because initramfs *IS* rootfs.

Instead, use the run-init program from the klibc distribution, or
something similar.  It cleans up the initramfs contents and overmounts
it with the new root filesystem.

	-hpa