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>

*** 16,35 ****
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #ifndef _NFS4_DRC_H
  #define _NFS4_DRC_H
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /*
--- 16,38 ----
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
+ 
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
+ /*
+  * Copyright 2018 Nexenta Systems, Inc.
+  */
+ 
  #ifndef _NFS4_DRC_H
  #define _NFS4_DRC_H
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /*
*** 68,83 ****
  #define NFS4_DUP_FREE           3
  
  #define NFS4_DUP_REPLAY         4
  #define NFS4_DUP_INUSE          5
  
- extern rfs4_drc_t *nfs4_drc;
  extern uint32_t nfs4_drc_max;
  extern uint32_t nfs4_drc_hash;
  
  rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
! void rfs4_fini_drc(rfs4_drc_t *);
  void rfs4_dr_chstate(rfs4_dupreq_t *, int);
  rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
  int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);
  
  #ifdef  __cplusplus
--- 71,85 ----
  #define NFS4_DUP_FREE           3
  
  #define NFS4_DUP_REPLAY         4
  #define NFS4_DUP_INUSE          5
  
  extern uint32_t nfs4_drc_max;
  extern uint32_t nfs4_drc_hash;
  
  rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
! void rfs4_fini_drc(void);
  void rfs4_dr_chstate(rfs4_dupreq_t *, int);
  rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
  int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);
  
  #ifdef  __cplusplus