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>

@@ -2180,11 +2180,11 @@
                         if (rc->rc_error == 0)
                                 continue;
 
                         zio_nowait(zio_vdev_child_io(zio, NULL, cvd,
                             rc->rc_offset, rc->rc_data, rc->rc_size,
-                            ZIO_TYPE_WRITE, zio->io_priority,
+                            ZIO_TYPE_WRITE, ZIO_PRIORITY_ASYNC_WRITE,
                             ZIO_FLAG_IO_REPAIR | (unexpected_errors ?
                             ZIO_FLAG_SELF_HEAL : 0), NULL, NULL));
                 }
         }
 }