From owner-freebsd-current@FreeBSD.ORG  Wed Jun  1 13:07:33 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: 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 36D7B16A41C
	for <current@FreeBSD.org>; Wed,  1 Jun 2005 13:07:33 +0000 (GMT)
	(envelope-from andy@siliconlandmark.com)
Received: from lexi.siliconlandmark.com (lexi.siliconlandmark.com
	[209.69.98.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id DA5C443D4C
	for <current@FreeBSD.org>; Wed,  1 Jun 2005 13:07:32 +0000 (GMT)
	(envelope-from andy@siliconlandmark.com)
Received: from lexi.siliconlandmark.com (localhost [127.0.0.1])
	by lexi.siliconlandmark.com (8.13.3/8.13.3) with ESMTP id
	j51D7TuA037204; Wed, 1 Jun 2005 09:07:29 -0400 (EDT)
	(envelope-from andy@siliconlandmark.com)
Received: from localhost (andy@localhost)
	by lexi.siliconlandmark.com (8.13.3/8.13.3/Submit) with ESMTP id
	j51D7To9037201; Wed, 1 Jun 2005 09:07:29 -0400 (EDT)
	(envelope-from andy@siliconlandmark.com)
X-Authentication-Warning: lexi.siliconlandmark.com: andy owned process doing
	-bs
Date: Wed, 1 Jun 2005 09:07:29 -0400 (EDT)
From: Andre Guibert de Bruet <andy@siliconlandmark.com>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
In-Reply-To: <41216.1117630645@critter.freebsd.dk>
Message-ID: <20050601090236.L69811@lexi.siliconlandmark.com>
References: <41216.1117630645@critter.freebsd.dk>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Information: Please contact the ISP for more information
X-SL-MailScanner: Found to be clean
X-SL-SpamCheck: not spam, SpamAssassin (score=-2.541, required 6,
	autolearn=not spam, AWL 0.06, BAYES_00 -2.60)
X-MailScanner-From: andy@siliconlandmark.com
Cc: current@FreeBSD.org
Subject: Re: [RFC] [PATCH] VM & VFS changes
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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, 01 Jun 2005 13:07:33 -0000


On Wed, 1 Jun 2005, Poul-Henning Kamp wrote:
> In message <20050601083308.D69811@lexi.siliconlandmark.com>, Andre Guibert de B
> ruet writes:
> Don Lewis wrote:
>>> This problem is a bit complicated because there can be various
>>> combinations of:
>>>
>>> 	mounted file systems that reside on swap-backed memory disks
>>>
>>> 	mounted file systems that reside on vnode-backed memory disks
>>>
>>> 	vnode-backed memory disks used as swap devices
>
> Maybe the simplest solution is also the best:  keep track of the
> dependencies and do the cleanup leaf->root on the resulting tree.
>
> It would not take much more than a simple data structure to let
> the various pieces of code (mainly md(4) really) say "this device
> depends on this other thing".

PHK,

How would you suggest implementing this? A TAILQ in global scope and a new 
struct?

Did you get a chance to look at the patch? Do you have additional comments 
on it?

Thanks,
Andy

/*  Andre Guibert de Bruet  * 6f43 6564 7020 656f 2e74 4220 7469 6a20 */
/*   Code poet / Sysadmin   * 636f 656b 2e79 5320 7379 6461 696d 2e6e */
/*   GSM: +1 734 846 8758   * 5520 494e 2058 6c73 7565 6874 002e 0000 */
/* WWW: siliconlandmark.com *      Tormenting bytes since 1980.       */