OS-3280 need a way to specify the root of a native system in the lx brand
OS-3279 lx brand should allow delegated datasets
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

@@ -23,10 +23,11 @@
  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
 #include "lint.h"
+#include "thr_uberdata.h"
 #include <sys/types.h>
 #include <sys/syscall.h>
 #include <sys/zone.h>
 #include <sys/priv.h>
 #include <priv_private.h>

@@ -238,6 +239,13 @@
 
 int
 zone_list_datalink(zoneid_t zoneid, int *dlnump, datalink_id_t *linkids)
 {
         return (syscall(SYS_zone, ZONE_LIST_DATALINK, zoneid, dlnump, linkids));
+}
+
+const char *
+zone_get_nroot()
+{
+        uberdata_t *udp = curthread->ul_uberdata;
+        return (udp->ub_broot);
 }