4045 zfs write throttle & i/o scheduler performance work
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>

*** 218,227 ****
--- 218,228 ----
  } dmu_object_type_t;
  
  typedef enum txg_how {
          TXG_WAIT = 1,
          TXG_NOWAIT,
+         TXG_WAITED,
  } txg_how_t;
  
  void byteswap_uint64_array(void *buf, size_t size);
  void byteswap_uint32_array(void *buf, size_t size);
  void byteswap_uint16_array(void *buf, size_t size);