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

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Message-ID: <46BF7451.2020306@zytor.com>
Date:	Sun, 12 Aug 2007 13:57:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	Al Viro <viro@....linux.org.uk>,
	Mark Cannon <random.bits@...ers.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Use of directories to hold root?

Jan Engelhardt wrote:
> On Aug 12 2007 21:23, Al Viro wrote:
>>> pivot_root is atomic afaict, for `mount --move` (which I think Al meant 
>>> which MS_MOVE - or some C program using mount(2) of your own), you'd 
>>> need multiple calls to mount.
>> Move itself is done by a single syscall anyway...
>>
> Yes, but you need needed 2 mounts, 1 chdir and one chroot. Plus, you 
> have not freed the data in the rootfs. (Well, neither does 
> pivot_root, but run-init from klibc will.)

Yes, which is why it is highly inappropriate for this particular case,
since they have multiple roots that they presumably don't want deleted!

	-hpa
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