Index: /trunk/src/VBox/Storage/VDBackendsInline.h
===================================================================
--- /trunk/src/VBox/Storage/VDBackendsInline.h	(revision 66491)
+++ /trunk/src/VBox/Storage/VDBackendsInline.h	(revision 66491)
@@ -0,0 +1,111 @@
+/* $Id$ */
+/** @file
+ * VD - backends inline helpers.
+ */
+
+/*
+ * Copyright (C) 2017 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+/*******************************************************************************
+*   Header Files                                                               *
+*******************************************************************************/
+#ifndef ___VDBackendsInline_h
+#define ___VDBackendsInline_h
+
+#include <iprt/cdefs.h>
+
+RT_C_DECLS_BEGIN
+
+/**
+ * Stub for VDIMAGEBACKEND::pfnGetComment when the backend doesn't suport comments.
+ *
+ * @returns VBox status code.
+ * @param a_szPrefixBackend    The backend prefix.
+ */
+#define VD_BACKEND_CALLBACK_GET_COMMENT_DEF_NOT_SUPPORTED(a_szStubName) \
+    static DECLCALLBACK(int) a_szStubName(void *pvBackend, char *pszComment, size_t cbComment) \
+    { \
+        RT_NOREF2(pszComment, cbComment); \
+        LogFlowFunc(("pvBackend=%#p pszComment=%#p cbComment=%zu\n", pvBackend, pszComment, cbComment)); \
+        AssertPtrReturn(pvBackend, VERR_VD_NOT_OPENED); \
+        LogFlowFunc(("returns %Rrc comment='%s'\n", VERR_NOT_SUPPORTED, pszComment)); \
+        return VERR_NOT_SUPPORTED; \
+    } \
+    typedef int ignore_semicolon
+
+
+/**
+ * Stub for VDIMAGEBACKEND::pfnSetComment when the backend doesn't suport comments.
+ *
+ * @returns VBox status code.
+ * @param a_szPrefixBackend    The backend prefix.
+ * @param a_ImageStateType     Type of the backend image state.
+ */
+#define VD_BACKEND_CALLBACK_SET_COMMENT_DEF_NOT_SUPPORTED(a_szStubName, a_ImageStateType) \
+    static DECLCALLBACK(int) a_szStubName(void *pvBackend, const char *pszComment) \
+    { \
+        RT_NOREF1(pszComment); \
+        LogFlowFunc(("pvBackend=%#p pszComment=\"%s\"\n", pvBackend, pszComment)); \
+        a_ImageStateType pThis = (a_ImageStateType)pvBackend; \
+        AssertPtrReturn(pThis, VERR_VD_NOT_OPENED); \
+        int rc = VERR_NOT_SUPPORTED; \
+        if (pThis->uOpenFlags & VD_OPEN_FLAGS_READONLY) \
+            rc = VERR_VD_IMAGE_READ_ONLY; \
+        LogFlowFunc(("returns %Rrc\n", rc)); \
+        return rc; \
+    } \
+    typedef int ignore_semicolon
+
+
+/**
+ * Stub for VDIMAGEBACKEND::pfnGetUuid when the backend doesn't suport UUIDs.
+ *
+ * @returns VBox status code.
+ * @param a_szPrefixBackend    The backend prefix.
+ */
+#define VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(a_szStubName) \
+    static DECLCALLBACK(int) a_szStubName(void *pvBackend, PRTUUID pUuid) \
+    { \
+        RT_NOREF1(pUuid); \
+        LogFlowFunc(("pvBackend=%#p pUuid=%#p\n", pvBackend, pUuid)); \
+        AssertPtrReturn(pvBackend, VERR_VD_NOT_OPENED); \
+        LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid)); \
+        return VERR_NOT_SUPPORTED; \
+    } \
+    typedef int ignore_semicolon
+
+
+/**
+ * Stub for VDIMAGEBACKEND::pfnSetComment when the backend doesn't suport UUIDs.
+ *
+ * @returns VBox status code.
+ * @param a_szPrefixBackend    The backend prefix.
+ * @param a_ImageStateType     Type of the backend image state.
+ */
+#define VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(a_szStubName, a_ImageStateType) \
+    static DECLCALLBACK(int) a_szStubName(void *pvBackend, PCRTUUID pUuid) \
+    { \
+        RT_NOREF1(pUuid); \
+        LogFlowFunc(("pvBackend=%#p Uuid=%RTuuid\n", pvBackend, pUuid)); \
+        a_ImageStateType pThis = (a_ImageStateType)pvBackend; \
+        AssertPtrReturn(pThis, VERR_VD_NOT_OPENED); \
+        int rc = VERR_NOT_SUPPORTED; \
+        if (pThis->uOpenFlags & VD_OPEN_FLAGS_READONLY) \
+            rc = VERR_VD_IMAGE_READ_ONLY; \
+        LogFlowFunc(("returns %Rrc\n", rc)); \
+        return rc; \
+    } \
+    typedef int ignore_semicolon
+
+RT_C_DECLS_END
+
+#endif