8115 parallel zfs mount

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright 2017 RackTop Systems.
   */
  
  #ifndef _SYS_MUTEX_H
  #define _SYS_MUTEX_H
  
*** 71,80 ****
--- 72,83 ----
          char            pad_pad[64 - sizeof (kmutex_t)];
  #endif
  } pad_mutex_t;
  #endif  /* _KERNEL */
  
+ extern char *volatile panicstr;  /* panic string pointer */
+ 
  #define MUTEX_HELD(x)           (mutex_owned(x))
  #define MUTEX_NOT_HELD(x)       (!mutex_owned(x) || panicstr)
  
  /*
   * We're simulating the kernel mutex API here, and the
*** 81,96 ****
   * user-level has a different signature, so rename.
   */
  #define mutex_init      kmutex_init
  #define mutex_destroy   kmutex_destroy
  
  extern  void    kmutex_init(kmutex_t *, char *, kmutex_type_t, void *);
  extern  void    kmutex_destroy(kmutex_t *);
  
! extern  void    mutex_enter(kmutex_t *);
  extern  int     mutex_tryenter(kmutex_t *);
- extern  void    mutex_exit(kmutex_t *);
  extern  int     mutex_owned(const kmutex_t *);
  
  extern  void *mutex_owner(const kmutex_t *);
  
  #ifdef  __cplusplus
--- 84,107 ----
   * user-level has a different signature, so rename.
   */
  #define mutex_init      kmutex_init
  #define mutex_destroy   kmutex_destroy
  
+ /*
+  * We want to avoid binding against the versions of these
+  * functions in libc which causes bad things to happen.
+  */
+ #define mutex_enter     kmutex_enter
+ #define mutex_exit      kmutex_exit
+ 
  extern  void    kmutex_init(kmutex_t *, char *, kmutex_type_t, void *);
  extern  void    kmutex_destroy(kmutex_t *);
  
! extern  void    kmutex_enter(kmutex_t *);
! extern  void    kmutex_exit(kmutex_t *);
! 
  extern  int     mutex_tryenter(kmutex_t *);
  extern  int     mutex_owned(const kmutex_t *);
  
  extern  void *mutex_owner(const kmutex_t *);
  
  #ifdef  __cplusplus