linux-kernel - Re: NFSROOT with NFS Version 3

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Message-Id: <1164044080.5700.61.camel@lade.trondhjem.org>
Date:	Mon, 20 Nov 2006 12:34:40 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Christoph Pleger <Christoph.Pleger@...-dortmund.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: NFSROOT with NFS Version 3

On Mon, 2006-11-20 at 17:33 +0100, Christoph Pleger wrote:
> Hello,
> 
> On Mon, 20 Nov 2006 08:57:16 -0500
> Joe Korty <joe.korty@...r.com> wrote:
> 
> > On Mon, Nov 20, 2006 at 12:07:50PM +0100, Christoph Pleger wrote:
> > > Warning: Unable to open an initial console
> > 
> > This usually means /dev/console doesn't exist.  With many of
> > today's distributions, this means you didn't boot with a
> > initrd properly set up to run with your newly built kernel.
> 
> The device /dev/console exists, but init/main.c tries to open it
> read-write. As the nfsroot is mounted read-only, /dev/console cannot be
> opened read-write.

Yes. NFSv3 has an ACCESS rpc call, which allows the client to request
the correct permissions from the server rather than relying on mode
bits.
IOW: this is definitely an intentional feature.

Cheers,
  Trond

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