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

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Message-ID: <20070811160704.GA21089@ftp.linux.org.uk>
Date:	Sat, 11 Aug 2007 17:07:04 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Mark Cannon <random.bits@...ers.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Use of directories to hold root?

On Sat, Aug 11, 2007 at 05:55:37PM +0200, 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

mount("foo", "foo", NULL, MS_BIND, 0);
chdir("foo");
mount(".", "/", NULL, MS_MOVE, 0);
chroot(".");
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