[PATCH] disk_util: Allow an engine to turn off disk_util specifically

Originally from Joel Becker <Joel.Becker@oracle.com>

An engine may support disks, but be unable to work with disk_util (as
there is no fd).  Add a flag to turn off disk_util from the engine.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index e9f34e8..0ca23cc 100644
--- a/fio.h
+++ b/fio.h
@@ -215,6 +215,7 @@
 	FIO_RAWIO	= 1 << 1,	/* some sort of direct/raw io */
 	FIO_DISKLESSIO	= 1 << 2,	/* no disk involved */
 	FIO_NOEXTEND	= 1 << 3,	/* engine can't extend file */
+	FIO_NODISKUTIL  = 1 << 4,       /* diskutil can't handle filename */
 };
 
 /*