kern/63605: Can't unmount DVDRAM with write protect

Kris Kennaway kris at
Sat Mar 6 01:10:10 PST 2004

The following reply was made to PR kern/63605; it has been noted by GNATS.

From: Kris Kennaway <kris at>
To: Jason Bacon <bacon at>
Cc: FreeBSD-gnats-submit at
Subject: Re: kern/63605: Can't unmount DVDRAM with write protect
Date: Sat, 6 Mar 2004 01:05:07 -0800

 On Mon, Mar 01, 2004 at 12:40:51PM -0600, Jason Bacon wrote:
 > 	If a DVDRAM is mounted with the write-protect enabled, attempts
 > 	to unmount will produce the error:
 > 	umount: umount of /dvdram failed: resource temporarily unavailable
 > 	Presumably, there is some pending write operation that cannot be
 > 	completed.  I think the system is missing the fact that the write
 > 	protect is on, and mounting rw.  It should detect the write-protect
 > 	upon mounting, and automatically mount read-only.
 > >How-To-Repeat:
 > 	Set write protect on a DVDRAM and mount it.
 > >Fix:
 > 	Workaround: camcontrol eject bus:target:lun will eject the disk,
 > 	but will not update the mount table.
 How are you mounting the disk?  Read-only disks should be mounted
 read-only; this may be the problem.

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