From owner-freebsd-current  Fri Feb  9  4:16:41 2001
Delivered-To: freebsd-current@freebsd.org
Received: from ns.sanda.gr.jp (ns.sanda.gr.jp [210.232.122.18])
	by hub.freebsd.org (Postfix) with ESMTP
	id 43AE237B6E7; Fri,  9 Feb 2001 04:16:19 -0800 (PST)
Received: from ever.sanda.gr.jp (epoch [10.93.63.51])
	by ns.sanda.gr.jp (8.9.3/3.7W) with ESMTP id VAA76642;
	Fri, 9 Feb 2001 21:16:17 +0900 (JST)
From: non@ever.sanda.gr.jp
Received: from localhost (localhost [127.0.0.1]) by ever.sanda.gr.jp (8.8.8/3.3W9) with ESMTP id VAA01834; Fri, 9 Feb 2001 21:16:17 +0900 (JST)
To: current@FreeBSD.ORG
Cc: trevor@jpj.net, akiyama@FreeBSD.ORG
Subject: Re: od driver for -CURRENT
In-Reply-To: <20010208102010.A12099@panzer.kdm.org>
References: <20010207171156.A72756@cicely5.cicely.de>
	<20010208214259C.non@ever.sanda.gr.jp>
	<20010208102010.A12099@panzer.kdm.org>
X-Mailer: Mew version 1.94 on Emacs 19.28 / Mule 2.3
 =?iso-2022-jp?B?KBskQkt2RSYyVhsoQik=?=
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-Id: <20010209211616W.non@ever.sanda.gr.jp>
Date: Fri, 09 Feb 2001 21:16:16 +0900
X-Dispatcher: imput version 20000228(IM140)
Lines: 51
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

From: "Kenneth D. Merry" <ken@kdm.org>
Subject: Re: od driver for -CURRENT
> > By the way, in Japanese users mailing list, some said that `da' does
> > not check whether a medium is writerable or not (write
> > protected). If you mount a write protected medium with -rw, it will
> > lead bad condition when you do umount. 
> 
> Hmm, can you demonstrate the problem?  The write-protect check in the od
> driver is one of the things that the da driver doesn't have.  I figured it
> wouldn't really be necessary, since any attempted writes would be returned
> with errors.

The problem is you cannot unmount after -rw mount with a write-protected 
medium. 

Below has been done also in 4.2-RELEASE with GENERIC kernel,
1. Insert a write protected medium,
2. mount /dev/da0s1c /mnt,
	cel# mount /dev/da0s1c /mnt
3. umount /mnt
	cel# umount /mnt
	umount: unmount of /mnt failed: Input/output error
	cel# umount /mnt
	umount: unmount of /mnt failed: Input/output error
   Umount does not success and `Write protected' messages continue to appear
4. reboot (umount fails)

In /var/log/mesages,

Feb  9 21:10:28 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 7 c9 2 0 
Feb  9 21:10:28 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:10:28 cel /kernel: (da0:ahc0:0:3:0): Write protected
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 7 c9 2 0 
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): Write protected
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 7 c9 2 0 
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:10:35 cel /kernel: (da0:ahc0:0:3:0): Write protected
Feb  9 21:10:40 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 0 49 4 0 
Feb  9 21:10:40 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:10:40 cel /kernel: (da0:ahc0:0:3:0): Write protected
Feb  9 21:11:09 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 0 49 4 0 
Feb  9 21:11:09 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:11:09 cel /kernel: (da0:ahc0:0:3:0): Write protected
Feb  9 21:11:38 cel /kernel: (da0:ahc0:0:3:0): WRITE(06). CDB: a 0 0 49 4 0 
Feb  9 21:11:38 cel /kernel: (da0:ahc0:0:3:0): DATA PROTECT asc:27,0
Feb  9 21:11:38 cel /kernel: (da0:ahc0:0:3:0): Write protected

Hope this helps.

// Noriaki Mitsunaga //


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message