From owner-freebsd-bugs@FreeBSD.ORG  Fri Nov 11 17:28:13 2005
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
X-Original-To: freebsd-bugs@freebsd.org
Delivered-To: freebsd-bugs@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id A791816A41F;
	Fri, 11 Nov 2005 17:28:13 +0000 (GMT)
	(envelope-from john@kozubik.com)
Received: from kozubik.com (kozubik.com [69.43.165.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5783443D45;
	Fri, 11 Nov 2005 17:28:13 +0000 (GMT)
	(envelope-from john@kozubik.com)
Received: from kozubik.com (localhost [127.0.0.1])
	by kozubik.com (8.12.11/8.12.11) with ESMTP id jABHSEBR064617;
	Fri, 11 Nov 2005 09:28:14 -0800 (PST)
	(envelope-from john@kozubik.com)
Received: from localhost (john@localhost)
	by kozubik.com (8.12.11/8.12.11/Submit) with ESMTP id jABHSEuQ064614;
	Fri, 11 Nov 2005 09:28:14 -0800 (PST)
	(envelope-from john@kozubik.com)
Date: Fri, 11 Nov 2005 09:28:14 -0800 (PST)
From: John Kozubik <john@kozubik.com>
To: freebsd-bugs@freebsd.org
Message-ID: <20051111091807.J95949@kozubik.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Cc: rwatson@freebsd.org
Subject: mounted snapshots still writeable 1.5 years later (RE: kern/68576)
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 11 Nov 2005 17:28:13 -0000


In July of 2004 (circa 5.2.1-RELEASE) I filed kern/68576 which described
how snapshot files can be mounted read/write and altered.  New files can
be added to them, existing files can be deleted or altered, and the
snapshot file can be returned to read-only state and still be used.

It was generally agreed that this was a bad thing - it is unexpected
behavior that contradicts the technical requirements of UFS2 snapshots as
well as the behavior that the FreeBSD documentation provides.  It is also
potentially dangerous.

It is now Nov. 2005, circa 5.4-RELEASE, and the behavior described in this
PR has not changed.

-----
John Kozubik - john@kozubik.com - http://www.kozubik.com