K 10 svn:author V 2 jh K 8 svn:date V 27 2011-03-18T08:48:06.152360Z K 7 svn:log V 227 MFC r210371: Convert md(4) to use alloc_unr(9) and alloc_unr_specific(9) for unit number allocation. The old approach had some problems such as it allowed an overflow to occur in the unit number calculation. PR: kern/122288 END