8115 parallel zfs mount

*** 23,32 ****
--- 23,33 ----
   * Use is subject to license terms.
   */
  /*
   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
   * Copyright (c) 2017 by Delphix. All rights reserved.
+  * Copyright 2017 RackTop Systems.
   */
  
  #ifndef _SYS_TASKQ_IMPL_H
  #define _SYS_TASKQ_IMPL_H
  
*** 33,42 ****
--- 34,44 ----
  #include <sys/taskq.h>
  #include <sys/inttypes.h>
  #include <sys/vmem.h>
  #include <sys/list.h>
  #include <sys/kstat.h>
+ #include <sys/rwlock.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif