linux-kernel - Re: Use of directories to hold root?

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Message-Id: <200708121539.48332.random.bits@rogers.com>
Date:	Sun, 12 Aug 2007 15:39:48 -0400
From:	Mark Cannon <random.bits@...ers.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: Use of directories to hold root?

On Saturday 11 August 2007, Jan Engelhardt wrote:
> 
> On Aug 10 2007 17:08, H. Peter Anvin wrote:
> >Jan Engelhardt wrote:
> >> On Aug 10 2007 17:24, Mark Cannon wrote:
> >>> You pass the kernel the root option to specify the root partition.
> >>> Is there a way to identify a directory in that partition that holds the
> >>> root or something equivalent to this?
> >> 
> >> No, but you can use pivot_root.
> >
> >Or better yet, use an initramfs with MS_MOVE; same as you would with the
> >"normal" use of initramfs.
> 
> mount --move /foo /
> => error
> 
> What did I miss?
> 
> 
> 
> 	Jan
Thank you for the prompt replies. I have looked int pivot_root and
with my limited knowledge it looks like I could do this in the linuxrc 
during start up. I believe the new kernel 2.6.21 is independent of the
root tree, so right after it mounts the old root /dev/sda3, it then can
pivot-root to /ker2621. 
This can quickly be tested in the lab. I already use chroot for tests. Was
unaware of pivot_root.

I am not sure I understand initramfs with MS_MOVE concept. I will look into
it. Any pointers for documentation? 

Again, thank you for the help.

Mark Cannon


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