Re: DVD burning still have problems

[Kasper Sandberg <lkml@metanurb.dk>]

On Mon, 2005-01-24 at 11:46 +1000, Tim Fairchild wrote:
> On Monday 24 Jan 2005 06:59, Alessandro Suardi wrote:
> > On Sun, 23 Jan 2005 21:26:55 +0100, Volker Armin Hemmann
> >
> > <volker.armin.hemmann@tu-clausthal.de> wrote:
> > > Hi,
> > >
> > > have you checked, that cdrecord is not suid root, and
> > > growisofs/dvd+rw-tools is?
> > >
> > > I had some probs, solved with a simple chmod +s growisofs :)
> >
> > Lucky you. Burning as root here, cdrecord not suid. Tried also
> >  burning with a +s growisofs, but...
> 
> You can test if it's the kernel/growisofs clashing by hacking the
> drivers/block/scsi_ioctl.c  code
> 
> It's around line 193 in 2.6.9, and line 196 in 2.6.10
> not sure about 2.6.11
at line 196
> 
> find the code:
> 
>         /* Write-safe commands just require a writable open.. */
>         if (type & CMD_WRITE_SAFE) {
>                 if (file->f_mode & FMODE_WRITE)
>                         return 0;
>         }
> 
> edit it to something like:
> 
>         /* Write-safe commands just require a writable open.. */
>         if (type & CMD_WRITE_SAFE) {
>                 printk ("Write safe command in ");
>                 if (file->f_mode & FMODE_WRITE)
>                         printk ("write mode.\n");
>                 else
>                         printk ("read mode.\n");
>                 return 0;
>         }
> 
> Compile the kernel with that and that may make it work and burn dvd and let 
> you know if it's growisofs sending incorrect commands. You'll get messages in 
> dmesg like
> 
> Write safe command in read mode.
> 
> which means growisofs is still not right. Maybe later version fixed this?
i got the latest version, and i just did this, nothing of this appeared
in dmesg, but also, i dont see what scsi_ioctl has to do with anything?
i dont use scsi emulation


> 
> tim
> 
>