K 10 svn:author V 5 dyson K 8 svn:date V 27 1996-03-19T05:13:22.000000Z K 7 svn:log V 296 Fix the problem that unmounting filesystems that are backed by a VMIO device have reference count problems. We mark the underlying object ono-persistent, and account for the reference count that the VM system maintainsfor the special device close. This should fix the removable device problem. END