From owner-freebsd-arch@FreeBSD.ORG  Tue Sep 30 18:20:17 2003
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 2879516A4F4; Tue, 30 Sep 2003 18:20:17 -0700 (PDT)
Received: from sccrmhc13.comcast.net (sccrmhc13.comcast.net [204.127.202.64])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id B921D43FDF; Tue, 30 Sep 2003 18:20:15 -0700 (PDT)
	(envelope-from julian@elischer.org)
Received: from interjet.elischer.org ([12.233.125.100])
          by comcast.net (sccrmhc13) with ESMTP
          id <20031001012014016005m212e>; Wed, 1 Oct 2003 01:20:15 +0000
Received: from localhost (localhost.elischer.org [127.0.0.1])
	by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id OAA31125;
	Sun, 28 Sep 2003 14:53:35 -0700 (PDT)
Date: Sun, 28 Sep 2003 14:53:34 -0700 (PDT)
From: Julian Elischer <julian@elischer.org>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
In-Reply-To: <653.1064784127@critter.freebsd.dk>
Message-ID: <Pine.BSF.4.21.0309281442490.16685-100000@InterJet.elischer.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: arch@freebsd.org
cc: current@freebsd.org
Subject: Re: HEADSUP: Change of makedev() semantics.
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussion related to FreeBSD architecture
	<freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 01 Oct 2003 01:20:17 -0000



On Sun, 28 Sep 2003, Poul-Henning Kamp wrote:
> Basically:
> 
> 	1. Do not call makedev().
> 
> 	2. If you do cloning, please look at the patches I posted
> 	    for if_tun/if_tap for how to do it.
> 

show an actual document please, explaining how this works from the
user's POV..

> 	3. If you do a "normal" device driver, cache the result
> 	   from when you call make_dev().
> 
> 	4. If you translate "foreign dev_t's", ie emulators or
> 	   compat code, contact me.  I'm not sure I understand
> 	   how this works and should work and we need to talk.


> 
> 	5. If anything else or in doubt, ask me.

more docs on how you invisage clonign to work.


> 
> Can I see some volounteers and/or maintainers please ?
> 
> 	./dev/nmdm/nmdm.c
> 		pseudo-cloning.  Should do real cloning.
> 

If the documentation is easily available and it does what I want I'll
convert it..
It may be available but I haven't seen it.. man make_dev(9) doesn't have
any 'see also' section that helps.. 

So, why should I not revoke a vnode that now refers to nothing?