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    SubjectRe: 2.6.3 BUG - can't write DVD-RAM - reported as write-protected
    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

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