Support for setting rated based on IOPS

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index b765718..a6adcb7 100644
--- a/fio.h
+++ b/fio.h
@@ -431,9 +431,12 @@
 	unsigned int rate;
 	unsigned int ratemin;
 	unsigned int ratecycle;
+	unsigned int rate_iops;
+	unsigned int rate_iops_min;
 	unsigned long rate_usec_cycle;
 	long rate_pending_usleep;
 	unsigned long rate_bytes;
+	unsigned long rate_blocks;
 	struct timeval lastrate;
 
 	unsigned long long io_size;