NEX-15279 support NFS server in zone
NEX-15520 online NFS shares cause zoneadm halt to hang in nfs_export_zone_fini
Portions contributed by: Dan Kruchinin dan.kruchinin@nexenta.com
Portions contributed by: Stepan Zastupov stepan.zastupov@gmail.com
Reviewed by: Joyce McIntosh <joyce.mcintosh@nexenta.com>
Reviewed by: Rob Gittins <rob.gittins@nexenta.com>
Reviewed by: Gordon Ross <gordon.ross@nexenta.com>

@@ -16,16 +16,18 @@
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
+
 /*
  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+
 /*
- * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
+ * Copyright 2018 Nexenta Systems, Inc.
  */
 
 #include <sys/systm.h>
 #include <sys/cmn_err.h>
 #include <nfs/nfs.h>

@@ -131,11 +133,11 @@
         struct nfs4_svgetit_arg sarg;
         struct compound_state cs;
         struct statvfs64 sb;
 
         rfs4_init_compound_state(&cs);
-        cs.vp = rootvp;
+        cs.vp = ZONE_ROOTVP();
         cs.fh.nfs_fh4_val = NULL;
         cs.cr = kcred;
 
         /*
          * Get all the supported attributes

@@ -1314,11 +1316,11 @@
                  * for a VROOT object.  sarg->vap was setup
                  * before we got here, so there's no need to do
                  * another getattr -- just use the one in sarg.
                  */
                 if (VN_CMP(vp, stubvp)) {
-                        ASSERT(VN_CMP(vp, rootdir));
+                        ASSERT(VN_CMP(vp, ZONE_ROOTVP()));
                         vap = sarg->vap;
                 } else {
                         va.va_mask = AT_NODEID;
                         vap = &va;
                         error = rfs4_vop_getattr(stubvp, vap, 0, sarg->cs->cr);