linux-kernel - Re: pivot_root alternative

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Message-ID: <467F3DA8.8030908@zytor.com>
Date:	Sun, 24 Jun 2007 20:59:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Hannemann <arnd@...dnet.de>
CC:	Jan Engelhardt <jengelh@...putergmbh.de>,
	Salvatore De Paolis <depaolis.salvatore@...ero.it>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: pivot_root alternative

Arnd Hannemann wrote:
> Jan Engelhardt schrieb:
>> On Jun 24 2007 23:27, Salvatore De Paolis wrote:
>>> i built the kernel with a busybox initramfs which runs from a usb stick. While
>>> i boot i need to mount the real root and i'm using pivot_root.
>>> Pivot_root . old-root return to me an "Invalid argument" error and googling i
>>> found here http://lkml.org/lkml/2005/10/8/17 that pivot_root should be avoided.
>>> I want to ask now what i should do to switch to a real root?
>> use run-init from klibc?
> 
> However be aware of the limitation of run-init:
> It only works for direct childs of root directory
> /mnt/newroot won't work
> /newroot should work ;-)
> 

Hm, that should probably be fixed.  It should be able to work on any
directory as long as there isn't another *filesystem* involved...

	-hpa
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