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diff --git a/src/VBox/Storage/testcase/VDIoBackend.h b/src/VBox/Storage/testcase/VDIoBackend.h
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+/** $Id: VDIoBackend.h $ */
+/** @file
+ *
+ * VBox HDD container test utility, async I/O backend
+ */
+
+/*
+ * 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_VDIoBackend_h
+#define VBOX_INCLUDED_SRC_testcase_VDIoBackend_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/sg.h>
+
+#include "VDDefs.h"
+
+/** I/O backend handle. */
+typedef struct VDIOBACKEND *PVDIOBACKEND;
+/** Pointer to a I/O backend handle. */
+typedef PVDIOBACKEND *PPVDIOBACKEND;
+
+/** Storage handle. */
+typedef struct VDIOSTORAGE *PVDIOSTORAGE;
+/** Pointer to a storage handle. */
+typedef PVDIOSTORAGE *PPVDIOSTORAGE;
+
+/**
+ * Completion handler.
+ *
+ * @returns nothing.
+ * @param   pvUser    Opaque user data.
+ * @param   rcReq     Completion code for the request.
+ */
+typedef DECLCALLBACKTYPE(int, FNVDIOCOMPLETE,(void *pvUser, int rcReq));
+/** Pointer to a completion handler. */
+typedef FNVDIOCOMPLETE *PFNVDIOCOMPLETE;
+
+/**
+ * Creates a new memory I/O backend.
+ *
+ * @returns IPRT status code.
+ *
+ * @param ppIoBackend    Where to store the handle on success.
+ */
+int VDIoBackendCreate(PPVDIOBACKEND ppIoBackend);
+
+/**
+ * Destroys a memory I/O backend.
+ *
+ * @returns nothing.
+ *
+ * @param pIoBackend     The backend to destroy.
+ */
+void VDIoBackendDestroy(PVDIOBACKEND pIoBackend);
+
+int VDIoBackendStorageCreate(PVDIOBACKEND pIoBackend, const char *pszBackend,
+                             const char *pszName, PFNVDIOCOMPLETE pfnComplete,
+                             PPVDIOSTORAGE ppIoStorage);
+
+void VDIoBackendStorageDestroy(PVDIOSTORAGE pIoStorage);
+
+int VDIoBackendStorageSetSize(PVDIOSTORAGE pIoStorage, uint64_t cbSize);
+
+int VDIoBackendStorageGetSize(PVDIOSTORAGE pIoStorage, uint64_t *pcbSize);
+
+DECLHIDDEN(int) VDIoBackendDumpToFile(PVDIOSTORAGE pIoStorage, const char *pszPath);
+
+/**
+ * Enqueues a new I/O request.
+ *
+ * @returns IPRT status code.
+ *
+ * @param pIoStorage     Storage handle.
+ * @param enmTxDir       The transfer direction.
+ * @param off            Start offset of the transfer.
+ * @param cbTransfer     Size of the transfer.
+ * @param pSgBuf         S/G buffer to use.
+ * @param pvUser         Opaque user data.
+ * @param fSync          Flag whether to wait for the operation to complete.
+ */
+int VDIoBackendTransfer(PVDIOSTORAGE pIoStorage, VDIOTXDIR enmTxDir, uint64_t off,
+                        size_t cbTransfer, PRTSGBUF pSgBuf, void *pvUser, bool fSync);
+
+#endif /* !VBOX_INCLUDED_SRC_testcase_VDIoBackend_h */