8115 parallel zfs mount

*** 9,25 ****
--- 9,27 ----
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
   * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright 2017 RackTop Systems.
   */
  
  #include <sys/kmem.h>
  
  #include <sys/debug.h>
  #include <sys/ksynch.h>
  #include <sys/systm.h>
+ #include <sys/cmn_err.h>
  
  #include <umem.h>
  
  void    abort(void) __NORETURN;
  
*** 63,73 ****
--- 65,98 ----
  kmem_zalloc(size_t size, int kmflags)
  {
          return (umem_zalloc(size, kmem2umem_flags(kmflags)));
  }
  
+ /*
+  * Do not change the length of the returned string; it must be freed
+  * with strfree().
+  */
+ char *
+ kmem_asprintf(const char *fmt, ...)
+ {
+         int size;
+         va_list adx;
+         char *buf;
  
+         va_start(adx, fmt);
+         size = vsnprintf(NULL, 0, fmt, adx) + 1;
+         va_end(adx);
+ 
+         buf = kmem_alloc(size, KM_SLEEP);
+ 
+         va_start(adx, fmt);
+         size = vsnprintf(buf, size, fmt, adx);
+         va_end(adx);
+ 
+         return (buf);
+ }
+ 
  void
  kmem_free(void *buf, size_t size)
  {
          umem_free(buf, size);
  }