CD speed discovery

[David Zeuthen]

On Sat, 2004-01-17 at 18:44, Bastien Nocera wrote:
> Heya,
> 
> So, I've managed to get around getting the speed problem sorted.
> Patch attached. 

Thanks. I've applied and committed this patch with the following change

original patch

  +                       if (read_speed) 
  +                           ds_property_set_int(d, 
  "storage.cdrom.write_speed", write_speed);

changed patch

  +                       if( write_speed>0 ) 
  +                           ds_property_set_int(d,
  "storage.cdrom.write_speed", write_speed);


It also only seems to work for ide-scsi, not ide-cd which the cdrw drive
on my test system is using, so some more work is required. What is the
unit of the numbers?
With ide-cd I get storage.cdrom.read_speed==3528 so I assume this is
kb/s, yes? (the file /proc/sys/dev/cdrom/info suggest 20x and 20 times
150-something is ~= 3528)

I think ide-scsi comment goes for your DVD[+-]RW patch as well - I
haven't got any DVD writers to test. I've added an item in doc/TODO so
we don't forget this.

Btw, isn't ide-scsi going away in Linux 2.6?

> I snuck in a patch to open the CD drive O_EXCL, to avoid
> colliding with a running application using the CD.
> 

Makes sense.

> PS: libbacon's CD drive discovery code is much cleaner with HAL support
> http://www.hadess.net/files/patches/hald-dvd-support/libbacon-hal-with-speed.patch

Woow, cool.

Cheers,
David