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diff --git a/src/VBox/Storage/testcase/VDDefs.h b/src/VBox/Storage/testcase/VDDefs.h
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+++ b/src/VBox/Storage/testcase/VDDefs.h
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+/** $Id: VDDefs.h $ */
+/** @file
+ *
+ * VBox HDD container test utility, common definitions.
+ */
+
+/*
+ * Copyright (C) 2013-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef VBOX_INCLUDED_SRC_testcase_VDDefs_h
+#define VBOX_INCLUDED_SRC_testcase_VDDefs_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/sg.h>
+
+/**
+ * I/O transfer direction.
+ */
+typedef enum VDIOTXDIR
+{
+    /** Read. */
+    VDIOTXDIR_READ = 0,
+    /** Write. */
+    VDIOTXDIR_WRITE,
+    /** Flush. */
+    VDIOTXDIR_FLUSH,
+    /** Invalid. */
+    VDIOTXDIR_INVALID
+} VDIOTXDIR;
+
+#endif /* !VBOX_INCLUDED_SRC_testcase_VDDefs_h */