Messages in this thread | | | Date | Tue, 23 Oct 2001 10:42:11 -0700 | From | Eric <> | Subject | Re: [Q] pivot_root and initrd |
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Would it even be worthwhile to propose a patch that would set a flag when pivot_root is called during an initrd and prevent change_root from occuring once the linuxrc thread exits?
Your method of placing "initrx=xxx" and "root=xxx" is similar to my method of stuffing those values into /proc/sys/kernel/real_root_dev once the pivot_root is complete; I am not really happy with that solution, not the least of which because it is an undocumented work-around and somewhat unexpected behavior for a system call that is to (presumably) replace or augment change_root.
I was also hoping that Warner or Hans would chime-in either in defense of the current documentation or with clarifications...
E
HPA wrote: >> >> I am mystified that the call to 'exec /sbin/init' works >> if you are using the standard (you mention "based on RedHat7.1" >> util-linux") /sbin/init proggie, and that a standard RH7.1 >> initscripts would not complain when the root filesystem is already >> mounted r/w. >> >> I would also guess that you are susceptible to the kernel's >> change_root call if your /sbin/init terminates. I'll have to >> play with the disk a bit. >> > > I modify the initscripts to not try to fsck and remount the root -- > its a ramfs (tmpfs in a later version) after all. If I had been > mounting a filesystem off the harddisk I would either have mounted it > readonly and left the init scripts as-is, or fscked it before > mounting. > > I pass the following command line options to the kernel (this is set > up in isolinux.cfg): > > append initrd=initrd.gz root=/dev/ram0 init=/linuxrc single > > By specifying root=/dev/ram0 and an explicit init (which I'm calling > /linuxrc but could just as easily have called /sbin/init) I'm telling > the kernel that this is the final root, and effectively turn off most > of the initrd legacy weirdness. > > If /sbin/init exits, the kernel panics, just like it would normally do > if init goes away.
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