On 12/03/2008, Jeff Dike <[EMAIL PROTECTED]> wrote: > On Wed, Mar 12, 2008 at 05:00:31PM +0100, Flavio wrote: > > I would like to ask you a simple question about cdrom and usb pen > > drives utilisation. > > > > I would like to know if I must insert a cd-rom in the cd-rom reader > > before uml starts, in case I have to use the cd-rom under UML. > > > > If I put the cd in before uml starts, there's no problem to mount and > > using it; but If I decide to insert the CD-ROM once UML is started (ot > > to not insert it at all)I get the following error in dmesg: > > > > Couldn't open "/dev/cdrom", errno = 123. > > > UML shouldn't try to open the host device until a UML process tries > opening the corresponding UML device. And it closes the host device > when the last open of the UML device goes away. I'd suspect something > in your distro is scanning UML devices and that's causing UML to try > to open the host device.
Thank you Jeff, I'm not sure I perfectly understand. So, here's what I was trying to do: binding the /dev/cdrom with the /dev/ubd2 virtual device, passing the ubd2=/dev/cdrom in the command line kernel option (no cd-rom inserted up to here). Once UML has finished to boot I do 'eject /dev/ubd2' to cause the cd-rom reader opening. I get the following message: ~# eject /dev/ubd2 eject: unable to open `/dev/ubd2' If I put the cd into the reader before starting UML it's all right. I can use the cd-rom as well as the usb pen drive etc. But I can't still eject, actually: eject /dev/ubd2 not an sg device, or old sg driver eject: unable to eject, last error: Invalid argument Anyway, it's only for testing purposes at the moment. Maybe I'm trying to do something impossible, but I just want to be sure of that. If that is impossible I can understand security reasons. Thanks a lot, Flavio ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
