Add verify_pattern option

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index eb36d1c..2ca800b 100644
--- a/fio.h
+++ b/fio.h
@@ -397,6 +397,8 @@
 	unsigned int verifysort;
 	unsigned int verify_interval;
 	unsigned int verify_offset;
+	unsigned int verify_pattern;
+	unsigned int verify_pattern_bytes;
 	unsigned int use_thread;
 	unsigned int unlink;
 	unsigned int do_disk_util;