Add LFSR generator

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/file.h b/file.h
index ce92ff7..9dd0873 100644
--- a/file.h
+++ b/file.h
@@ -7,6 +7,7 @@
 #include "flist.h"
 #include "lib/zipf.h"
 #include "lib/bitmap.h"
+#include "lib/lfsr.h"
 
 /*
  * The type of object we are working on
@@ -111,6 +112,8 @@
 	 */
 	struct bitmap *io_bitmap;
 
+	struct fio_lfsr lfsr;
+
 	/*
 	 * Used for zipf random distribution
 	 */