11083 support NFS server in zone
Portions contributed by: Dan Kruchinin <dan.kruchinin@nexenta.com>
Portions contributed by: Stepan Zastupov <stepan.zastupov@gmail.com>
Portions contributed by: Joyce McIntosh <joyce.mcintosh@nexenta.com>
Portions contributed by: Mike Zeller <mike@mikezeller.net>
Portions contributed by: Dan McDonald <danmcd@joyent.com>
Portions contributed by: Gordon Ross <gordon.w.ross@gmail.com>
Portions contributed by: Vitaliy Gusev <gusev.vitaliy@gmail.com>
Reviewed by: Rick McNeal <rick.mcneal@nexenta.com>
Reviewed by: Rob Gittins <rob.gittins@nexenta.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Jason King <jbk@joyent.com>
Reviewed by: C Fraire <cfraire@me.com>
Change-Id: I22f289d357503f9b48a0bc2482cc4328a6d43d16

@@ -16,15 +16,16 @@
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
+
 /*
  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright 2018 Joyent, Inc.
- * Copyright 2019 Nexenta Systems, Inc. All rights reserved.
  * Copyright 2014 Igor Kozhukhov <ikozhukhov@gmail.com>.
+ * Copyright 2019 Nexenta Systems, Inc. All rights reserved.
+ * Copyright 2020 Joyent, Inc.
  */
 
 #ifndef _SYS_ZONE_H
 #define _SYS_ZONE_H
 

@@ -637,11 +638,10 @@
 /*
  * Special value of zone_psetid to indicate that pools are disabled.
  */
 #define ZONE_PS_INVAL   PS_MYID
 
-
 extern zone_t zone0;
 extern zone_t *global_zone;
 extern uint_t maxzones;
 extern rctl_hndl_t rc_zone_nlwps;
 extern rctl_hndl_t rc_zone_nprocs;

@@ -779,10 +779,30 @@
  * Special processes visible in all zones.
  */
 #define ZONE_SPECIALPID(x)       ((x) == 0 || (x) == 1)
 
 /*
+ * A root vnode of the current zone.
+ *
+ * NOTE: It may be necessary (initialization time for file sharing where an
+ * NGZ loads a file-sharing kernel module that does zsd initialization) to NOT
+ * use this macro. One should ASSERT() that curzone == active ZSD (an
+ * ASSERTion that's not always true at ZSD initialization time) during regular
+ * use of this macro.
+ */
+#define ZONE_ROOTVP()   (curzone->zone_rootvp)
+
+/*
+ * Since a zone's root isn't necessarily an actual filesystem boundary
+ * (i.e. VROOT may not be set on zone->zone_rootvp) we need to not assume it.
+ * This macro helps in checking if a vnode is the current zone's rootvp.
+ * NOTE:  Using the VN_ prefix, even though it's defined here in zone.h.
+ * NOTE2: See above warning about ZONE_ROOTVP().
+ */
+#define VN_IS_CURZONEROOT(vp)   (VN_CMP(vp, ZONE_ROOTVP()))
+
+/*
  * Zone-safe version of thread_create() to be used when the caller wants to
  * create a kernel thread to run within the current zone's context.
  */
 extern kthread_t *zthread_create(caddr_t, size_t, void (*)(), void *, size_t,
     pri_t);