[systemd-devel] cdrom_id and 60-cdrom_id.rules behavior

[Greg KH]

On Mon, Jan 12, 2015 at 09:39:30AM +0100, Robert Milasan wrote:
> Hello, a while back, around 2011, in cdrom_id was added --eject-media,
> --lock-media and --unlock-media for not much explanation.
> 
> Now, recently some people noticed that this might actually be a
> problem. 
> 
> Reference: http://bugzilla.opensuse.org/show_bug.cgi?id=909418
> 
> Here is a scenario:
> 
> 1. add a CD/DVD into the driver
> 2. mount the driver: mount /dev/sr0 /mnt/my_cd (ensure you don't
> use the Gnome/KDE auto-mounting or reproduce this in a server setup)
> 3. eject the media (using the hardware button) and add a new one media
> (different disk)
> 4. ls /mnt/my_cd (it will be an empty output or the previous media)
> 
> Is this expected?

Yes, because you didn't unmount the media and tell the kernel that the
filesystem is now gone.

> Also, I remember a while back (long time ago) that
> once you added a media into the driver and it was properly mounted, you
> couldn't eject the media until you unmounted the media.

It depends on the hardware, some devices support this, others don't.

> NOTE: This works somewhat OK in the desktop setup, probably due to
> udisks (using Gnome/KDE), but in the console not really.

Then use udisks :)

thanks,

greg k-h