Add iodepth_batch_complete control

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index 9d80237..207b2ec 100644
--- a/fio.h
+++ b/fio.h
@@ -418,6 +418,7 @@
 	unsigned int iodepth;
 	unsigned int iodepth_low;
 	unsigned int iodepth_batch;
+	unsigned int iodepth_batch_complete;
 
 	unsigned long long size;
 	unsigned int fill_device;