[PATCH] Change O_DIRECT vs buffered setup

Change the default from O_DIRECT IO to normal buffered IO. That makes
more sense, as O_DIRECT is a special case and should be manually
enabled as such.

Do this by adding a option negate switch, so we don't need two sets
of parameters to control these options.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/parse.c b/parse.c
index 886bde6..81ffb74 100644
--- a/parse.c
+++ b/parse.c
@@ -267,6 +267,9 @@
 			return 1;
 		}
 
+		if (o->neg)
+			il = !il;
+
 		if (fn)
 			ret = fn(data, &il);
 		else {