verify: add new experimental mode that requires no meta data

Should work fine, but we need to account and track trims to know
which blocks NOT to verify (or verify as zero).

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/libfio.c b/libfio.c
index 96ae814..8255072 100644
--- a/libfio.c
+++ b/libfio.c
@@ -82,7 +82,7 @@
 	/*
 	 * reset file done count if we are to start over
 	 */
-	if (td->o.time_based || td->o.loops)
+	if (td->o.time_based || td->o.loops || td->o.do_verify)
 		td->nr_done_files = 0;
 }