Need help to umount initrd and mount real file system

[Rupesh Gujare]

hello all,
 thanks for help..  and sorry for not stating my problem clearly
so finally i was able to change rootfs.. Here is what i did at interactive shell by adding /bin/sh at start in /etc/init.d/rcS:--

 mount -t proc none /proc
 mount -t ext2 /dev/sda1 /tmp
 cd /tmp
 umount /proc
 pivot_root . tmp   #tmp exist on new-root
 mount -t proc none /proc
 exec chroot . /bin/ash <dev/console > dev/console 2>&1
 exec chroot . /sbin/init <dev/console > dev/console 2>&1
 umount /tmp
 
BUT HERE I GET ERROR AS:--
Device or resource busy
 
 Where I am going wrong?
I am compiling busybox with shared library as a dynamically linked.
 Is it problem with /dev/sda1? ie. i am referencing to /dev/sda1 on old   root FS(if it's like that, then how to overcome it?). or with shared libraries on old FS?
 your help is greatly appreciated..
 Thanks in advance..

Rupesh Gujare.




On Tue, 06 Feb 2007 Denis Vlasenko wrote :
>On Monday 05 February 2007 15:11, Rupesh Gujare wrote:
> >
> > I had tried with pivot_root:
> >  I entered
> > /bin/sh  in /etc/rcS
> > and after mounting /proc tried to do pivot_root
> >  it gives me
> > pivot_root:pivot_root: Device or resource busy.
> >  any clue why it is like this?
>
>Oh, wonderful problem report. No solid info on what exactly
>you did (params to pivot_root etc...).
>
>Anyway, a part of my homemade initrd whcu does pivot_root
>(bu this time "new" rootfs is mounted on /new_root):
>
>
># Clean up
>#umount /sys
>umount /proc
>
>echo "# Chrooting into root fs"
># we expect that /dev/console and /dev/null exist in /new_root/dev
>cd /new_root
># making sure we dont keep /dev busy
>exec <dev/console >dev/console 2>&1
># proc/ in new root is used here as a temp mountpoint for old root
>pivot_root . proc || {
>     echo "pivot_root failed. Fatal, cannot continue booting"
>     while true; do sleep 32000; done
>}
>
>exec \
>chroot . \
>sh -c '\
>umount -n /proc || { echo "! error unmounting initrd fs, continuing"; sleep 10; }
>exec /bin/env - /sbin/init
>'
>
>echo "chroot . sh failed. Fatal, cannot continue booting"
>while true; do sleep 32000; done
>
>
>Hope this helps
>--
>vda
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