Le jeudi 24 février 2005 à 10:13 +0100, Gildas Bayard a écrit :
Le jeudi 24 février 2005 à 09:35 +0100, Féliciano Matias a écrit :
> Le mercredi 23 février 2005 à 17:07 +0100, Gildas Bayard a écrit :
> > I understand that this system is mandatory to load exotic scsi drivers
> > or add a pause when booting to usb but I wonder why it is always used
> > - on kernel 2.4 (red hat 9) the initrd image is an ext2 filesystems.
>
> For *your* system. My initrd also contain raid0 and dm-mod
> (see /sbin/mkinitrd and "man mkinitrd").
No I mean the initrd file is an ext2 filesystem (whatever it contains)
On FC3 it is a cpio archive. Why?
Not sure, but I think because cpio archive is smaller.
And why when initrd is a cpio archive
it would not load linuxrc?
I don't know.
Answers to these question are not in man initrd, man nash...
>
> > It
> > contains a linuxrc nash script. On kernel 2.6 (fedora 3) the initrd is a
> > cpio archive and does not contains a linuxrc script. Could someone
> > briefly explain me why these differences? Particularly I wondering about
> > 3 things:
> > 1) I tried to repack my custom initrd ext2 filesystem into a cpio
> > archive and found that when packed as a cpio archive it's not executing
> > my linuxrc script (is it the way it's supposed to be?)
>
> use "/init".
Well I want to understand why my linuxrc is not run when in a cpio
archive and again what the matter with the cpio archive
>
> > 2) What are the differences between pivot_root and switch_root (new in
> > 2.6) ?
> > 3) Why using nash in the first place?
>
> nash is a mini-mini-mini-shell (bash is TTOOOO big). See "man nash".
man nash does not explain what is the rational for both pivot_root and
switch_root (just give a small description).
=> Why pivot_root was not enough?
From rom nash.c :
/* 2.6 magic not-pivot-root but kind of similar stuff.
* This is based on code from klibc/utils/run_init.c
*/
int switchrootCommand(char * cmd, char * end) {
=> Why not wait until the end of linuxrc to jump to the new root
fs?
???
I would like to know how to get in touch with nash coders.
From rom nash.c :
* Erik Troan (ewt _AT_
redhat.com)
* Jeremy Katz (katzj _AT_
redhat.com)
On which
forum or mailing list could they be hanging on?
fedora-devel :-)
> > Could we just wait until the end
> > of the linuxrc script? At that time the kernel would move to the new
> > root fs (whitout the need for pivot_root or switch_root)
> >
> > And finally, if I'm right the end of the nash script (after switch_root)
> > is never executed?
> >
> > Gildas
> >
> --