From owner-freebsd-current@FreeBSD.ORG  Wed Apr  6 10:55:37 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 830FD16A4CE
	for <freebsd-current@freebsd.org>;
	Wed,  6 Apr 2005 10:55:37 +0000 (GMT)
Received: from critter.freebsd.dk (f170.freebsd.dk [212.242.86.170])
	by mx1.FreeBSD.org (Postfix) with ESMTP id BBEEB43D45
	for <freebsd-current@freebsd.org>;
	Wed,  6 Apr 2005 10:55:36 +0000 (GMT)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.13.3/8.13.1) with ESMTP id j36AtXiR007841;
	Wed, 6 Apr 2005 12:55:35 +0200 (CEST)
	(envelope-from phk@critter.freebsd.dk)
To: Gary Jennejohn <garyj@jennejohn.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Wed, 06 Apr 2005 10:45:33 +0200."
             <200504060845.j368jXiU001289@peedub.jennejohn.org> 
Date: Wed, 06 Apr 2005 12:55:33 +0200
Message-ID: <7840.1112784933@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
cc: freebsd-current@freebsd.org
Subject: Re: Panic on mount with write-locked USB media (umass) 
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Apr 2005 10:55:37 -0000

In message <200504060845.j368jXiU001289@peedub.jennejohn.org>, Gary Jennejohn writes:
>Robert Watson writes:
>> I wonder if a useful middle ground is to adopt (1) above except in the 
>> case of perenially read-only file systems (cd9660), in which case (2) is 
>> adopted?
>> 
>
>It sure would be nice if one could mount an ISO-image (vnode-backed md)
>RW.

All it takes is somebody to rewrite cd9660 to be a r/w filesystem :-)

It's not trivial though, because iso 9660 is essentially a sequential
archive with a index up front, so if you change the size of one file
all the ones after it move as well.  I guess as long as you don't
want to make any files longer it would be relatively possible.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.