Messages in this thread | | | Subject | Re: 2.6.3 BUG - can't write DVD-RAM - reported as write-protected | From | Olaf Frączyk <> | Date | Tue, 09 Mar 2004 08:59:25 +0100 |
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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
Regards,
Olaf
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