From owner-freebsd-arch@FreeBSD.ORG  Tue Jul 22 03:12:01 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 8976437B401
	for <freebsd-arch@freebsd.org>; Tue, 22 Jul 2003 03:12:01 -0700 (PDT)
Received: from cirb503493.alcatel.com.au
	(c211-28-27-130.belrs2.nsw.optusnet.com.au [211.28.27.130])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E9C0543FCB
	for <freebsd-arch@freebsd.org>; Tue, 22 Jul 2003 03:11:59 -0700 (PDT)
	(envelope-from PeterJeremy@optushome.com.au)
Received: from cirb503493.alcatel.com.au (localhost.alcatel.com.au
	[127.0.0.1])h6MABvgh027496;	Tue, 22 Jul 2003 20:11:58 +1000 (EST)
	(envelope-from jeremyp@cirb503493.alcatel.com.au)
Received: (from jeremyp@localhost)
	by cirb503493.alcatel.com.au (8.12.8/8.12.8/Submit) id h6MABg5Q027495;
	Tue, 22 Jul 2003 20:11:42 +1000 (EST)
Date: Tue, 22 Jul 2003 20:11:42 +1000
From: Peter Jeremy <PeterJeremy@optushome.com.au>
To: Mark Murray <mark@grondar.org>
Message-ID: <20030722101142.GB4105@cirb503493.alcatel.com.au>
References: <3F16DAFA.41E237F8@mindspring.com>
	<200307210752.h6L7q3Z2046577@grimreaper.grondar.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <200307210752.h6L7q3Z2046577@grimreaper.grondar.org>
User-Agent: Mutt/1.4.1i
cc: freebsd-arch@freebsd.org
Subject: Re: Things to remove from /rescue
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: Tue, 22 Jul 2003 10:12:01 -0000

On Mon, Jul 21, 2003 at 08:52:03AM +0100, Mark Murray wrote:
>Terry Lambert writes:
>> David O'Brien wrote:
>> > - tar, pax (w/{bz,g}zip) can do everything GNU tar can.
>> 
>> I agree with everything but this one.  Neither of these things can
>> make sparse files.
>
>Incorrect. Both can.

Not accurately.  They can detect that a file is sparse by comparing
the st_size and st_blocks fields returned by stat().  They can't
accurately differentiate between a block of NULs and a non-allocated
block in a sparse file.  AFAIK, the only utility that can exactly
reproduce a sparse file is dump/restore.

Peter