From owner-freebsd-current@FreeBSD.ORG  Thu Jan  5 11:26:26 2006
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: 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 D583A16A41F;
	Thu,  5 Jan 2006 11:26:26 +0000 (GMT)
	(envelope-from ozawa@ongs.co.jp)
Received: from hepitas.ongs.net (hepitas.ongs.net [202.216.232.59])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 6392943D58;
	Thu,  5 Jan 2006 11:26:25 +0000 (GMT)
	(envelope-from ozawa@ongs.co.jp)
Received: from [IPv6???1] (localhost.ongs.net [127.0.0.1])
	by hepitas.ongs.net (Postfix) with ESMTP id 6F8763F;
	Thu,  5 Jan 2006 13:51:30 +0900 (JST)
Message-ID: <43BCAA9F.2000505@ongs.co.jp>
Date: Thu, 05 Jan 2006 14:11:59 +0900
From: Masanori OZAWA <ozawa@ongs.co.jp>
Organization: ONGS Inc.
User-Agent: Mozilla Thunderbird 1.0.7 (X11/20051219)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Danny Braniss <danny@cs.huji.ac.il>
References: <E1EtKTm-0002vl-Ku@cs1.cs.huji.ac.il>
In-Reply-To: <E1EtKTm-0002vl-Ku@cs1.cs.huji.ac.il>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@freebsd.org, daichi@freebsd.org,
	freebsd-current@freebsd.org
Subject: Re: [unionfs][patch] improvements of the unionfs - Problem Report, 
 kern/91010
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: ozawa@ongs.co.jp
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: Thu, 05 Jan 2006 11:26:27 -0000

Danny Braniss wrote:
>>Masanori OZAWA wrote:
>>[...]
>>
>>Nice work! This is just a "works for me". In only find some issues with
>>permissions that were already present in the previous implementation of
>>unionfs. Some of them are partially corrected in the "useful" copymode.
>>I mailed the details to the author.
> 
> 
> the following will hang the kernel:
> 	root is mounted nfs,
> 	/etc is unionfs'ed so:
> 	from /etc/rc.initdiskless:
> 		...
> 		# Create a generic memory disk
> 		#
> 		mount_md() {
> 		    /sbin/mdmfs -i 4096 -s $1 -M md $2
> 		}
> 		kldload unionfs
> 		mount_md 4096 /.etc
> 		mount_unionfs /.etc /etc
> 		...
> 	and now:
> 		cd /etc
> 		mv some-file somefile
> and now the system is stuck.
> this behaviour is also present in the unpatched unionfs, but would be nice
> if it can be fixed.
> 
> 	danny
> ps: see http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/84107
> 

Okey. I found the cause of this problem. I fixed it  :)

http://people.freebsd.org/~daichi/unionfs/unionfs-p2.diff

I am getting a edit of HP around my improvements of unionfs
bacause someone have pointed out that your explanation is
not enough.

-- 
   ONGS Inc.
   Masanori OZAWA (ozawa@ongs.co.jp)
   WWW: http://www.ongs.co.jp/