diff --git a/ioengine.h b/ioengine.h
index 2caece7..18496c3 100644
--- a/ioengine.h
+++ b/ioengine.h
@@ -149,4 +149,23 @@
 void io_u_mark_complete(struct thread_data *, unsigned int);
 void io_u_mark_submit(struct thread_data *, unsigned int);
 
+#ifdef FIO_INC_DEBUG
+static inline void dprint_io_u(struct io_u *io_u, const char *p)
+{
+	struct fio_file *f = io_u->file;
+
+	dprint(FD_IO, "%s: io_u %p: off=%llu/len=%lu/ddir=%d", p, io_u,
+					(unsigned long long) io_u->offset,
+					io_u->buflen, io_u->ddir);
+	if (fio_debug & (1 << FD_IO)) {
+		if (f)
+			log_info("/%s", f->file_name);
+
+		log_info("\n");
+	}
+}
+#else
+#define dprint_io_u(io_u, p)
+#endif
+
 #endif