Re: circular pivot_root, is this possible ?

[David Bryson]

On Tue, Mar 02, 2004 at 05:11:26PM +0100 or thereabouts, Pascal Schmidt wrote:
> On Tue, 02 Mar 2004 03:40:09 +0100, you wrote in linux.kernel:
> 
> > Say the system needs an upgrade.... I want to
> >
> > 1) pivot_root _back out_ of the tmpfs, onto the initrd again
> > 2) obtain via network a new sys.img, write it to the flash
> > 3) wipe tmpfs, and recopy the contents of the new sys.img into memory
> > 4) pivot_root back into the tmpfs and start the higher level system
> > again
> 
> How about using a second, small tmpfs for / under/over which the tmpfs
> for the full system can be mounted and umounted at will?
> 

Are you suggesing something like:

* tmfs1 contains 'basic functionality'
* tmpfs2 is mounted somewhere on tmpfs1

I still fail to see how this will let one restart/position init based
on which filesystem/director is root.

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