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

[Olaf Frączyk]

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.

Regards,

Olaf


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