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Date: Wed, 15 May 2002 23:06:51 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: Andrea Arcangeli <andrea@suse.de>
cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.19pre8aa3
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On Thu, 16 May 2002, Andrea Arcangeli wrote:
> On Wed, May 15, 2002 at 07:30:18PM -0300, Rik van Riel wrote:
> > On Wed, 15 May 2002, Andrea Arcangeli wrote:
> >
> > > Only in 2.4.19pre8aa3: 00_ext3-register-filesystem-lifo-1
> > >
> > > 	Make sure to always try mounting with ext3 before ext2 (otherwise
> > > 	it's impossible to mount the real rootfs with ext3 if ext3 is a module
> > > 	loaded by an initrd and ext2 is linked into the kernel).
> >
> > Funny, I've been doing this for months.
> >
> > Maybe you should look into pivot_mount(2) and pivot_mount(8)
> > some day ?

> First of all there's no pivot_mount but there's only pivot_root (never
> mind, it is clear you meant pivot_root).
>
> Secondly pivot_root has nothing to do with handle_initrd.
>
> Go read init/do_mounts.c::handle_initrd. There are only two ways:

There's a third way, which is used on the initrd of most
distros:

--- snip from linuxrc ----
mount --ro -t $rootfs $rootdev /sysroot
pivot_root /sysroot /sysroot/initrd
------

This way you can specify both the root fs and - if wanted -
special mount options to the root fs. Then you pivot_root(2)
to move the root fs to / and the (old) initrd to /initrd.

The initscripts then umount /initrd, after which the initrd
data gets freed.

regards,

Rik
-- 
Bravely reimplemented by the knights who say "NIH".

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