Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261816AbUCIJM2 (ORCPT ); Tue, 9 Mar 2004 04:12:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261825AbUCIJM2 (ORCPT ); Tue, 9 Mar 2004 04:12:28 -0500 Received: from ns.virtualhost.dk ([195.184.98.160]:11736 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S261816AbUCIJMY (ORCPT ); Tue, 9 Mar 2004 04:12:24 -0500 Date: Tue, 9 Mar 2004 10:12:21 +0100 From: Jens Axboe To: Olaf Fr?czyk Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.3 BUG - can't write DVD-RAM - reported as write-protected Message-ID: <20040309091221.GV23525@suse.de> References: <1078434953.1961.13.camel@venus.local.navi.pl> <20040305082350.GO31750@suse.de> <1078487159.3300.23.camel@venus.local.navi.pl> <20040307105911.GH23525@suse.de> <1078819165.1525.1.camel@venus.local.navi.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1078819165.1525.1.camel@venus.local.navi.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3351 Lines: 87 On Tue, Mar 09 2004, Olaf Fr?czyk wrote: > On Sun, 2004-03-07 at 11:59, Jens Axboe wrote: > > On Fri, Mar 05 2004, Olaf Fr?czyk wrote: > > > On Fri, 2004-03-05 at 09:23, Jens Axboe wrote: > > > > On Thu, Mar 04 2004, Olaf Fr?czyk wrote: > > > > > Hi, > > > > > I switched to 2.6.3 from 2.4.x serie. > > > > > When I mount DVD-RAM it is mounted read-only: > > > > > > > > > > [root@venus olaf]# mount /dev/dvdram /mnt/dvdram > > > > > mount: block device /dev/dvdram is write-protected, mounting read-only > > > > > [root@venus olaf]# > > > > > > > > > > In 2.4 it is mounted correctly as read-write. > > > > > > > > > > Drive: Panasonic LF-201, reported in Linux as: > > > > > MATSHITA DVD-RAM LF-D200 A120 > > > > > > > > > > SCSI controller: Adaptec 2940U2W > > > > > > > > What does cat /proc/sys/dev/cdrom/info say? Do you get any kernel > > > > messages in dmesg when the rw mount fails? > > > > > > I get nothing in /var/log/dmesg and in /var/log/messages > > > In /proc/sys/dev/cdrom/info I get: > > > [olaf@venus olaf]$ cat /proc/sys/dev/cdrom/info > > > CD-ROM information, Id: cdrom.c 3.20 2003/12/17 > > > > > > drive name: sr1 sr0 hdc > > > drive speed: 0 16 44 > > > drive # of slots: 1 1 1 > > > Can close tray: 1 1 1 > > > Can open tray: 1 1 1 > > > Can lock tray: 1 1 1 > > > Can change speed: 1 1 1 > > > Can select disk: 0 0 0 > > > Can read multisession: 1 1 1 > > > Can read MCN: 1 1 1 > > > Reports media changed: 1 1 1 > > > Can play audio: 1 1 1 > > > Can write CD-R: 0 1 1 > > > Can write CD-RW: 0 1 1 > > > Can read DVD: 1 0 0 > > > Can write DVD-R: 0 0 0 > > > Can write DVD-RAM: 1 0 0 > > > Can read MRW: 0 0 1 > > > Can write MRW: 0 0 1 > > > > > > The one I'm mounting is /dev/scd1. > > > As there is capablity to write-protect DVD-RAM disk (like a 1.44" > > > Floppy), I think that the linux kernel interprets some message from > > > device in wrong way. > > > > Please repeat with this patch applied and send back the results, thanks. > > > > ===== drivers/cdrom/cdrom.c 1.48 vs edited ===== > > --- 1.48/drivers/cdrom/cdrom.c Mon Feb 9 21:58:21 2004 > > +++ edited/drivers/cdrom/cdrom.c Sun Mar 7 11:58:40 2004 > > @@ -645,9 +645,12 @@ > > { > > disc_information di; > > > > - if (cdrom_get_disc_info(cdi, &di)) > > + if (cdrom_get_disc_info(cdi, &di)) { > > + printk("cdrom: read di failed\n"); > > return 0; > > + } > > > > + printk("cdrom: erasable: %d\n", di.erasable); > > return di.erasable; > > } > > > I get: > cdrom: read di failed Can you try to instrument drivers/cdrom/cdrom.c:cdrom_get_disc_info() and find out where it fails? Change the cgc.quiet = 1 to a = 0 in there as well (that alone might be enough to pin point the problem). -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/