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diff --git a/src/VBox/Runtime/testcase/tstRTFilesystem.cpp b/src/VBox/Runtime/testcase/tstRTFilesystem.cpp
new file mode 100644
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+++ b/src/VBox/Runtime/testcase/tstRTFilesystem.cpp
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+/* $Id: tstRTFilesystem.cpp $ */
+/** @file
+ * IPRT Testcase - IPRT Filesystem API (Fileystem)
+ */
+
+/*
+ * Copyright (C) 2012-2020 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.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/vfs.h>
+#include <iprt/errcore.h>
+#include <iprt/test.h>
+#include <iprt/file.h>
+#include <iprt/string.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+
+static int tstRTFilesystem(RTTEST hTest, RTVFSFILE hVfsFile)
+{
+    int rc = VINF_SUCCESS;
+    RTVFS hVfs = NIL_RTVFS;
+
+    RTTestSubF(hTest, "Create filesystem object");
+
+    rc = RTVfsMountVol(hVfsFile,  RTVFSMNT_F_READ_ONLY | RTVFSMNT_F_FOR_RANGE_IN_USE, &hVfs, NULL);
+    if (RT_FAILURE(rc))
+    {
+        RTTestIFailed("RTVfsMountVol -> %Rrc", rc);
+        return rc;
+    }
+
+    /* Check all blocks. */
+    uint64_t off = 0;
+    uint32_t cBlocksUsed = 0;
+    uint32_t cBlocksUnused = 0;
+    uint64_t cbFs = 0;
+
+    rc = RTVfsFileQuerySize(hVfsFile, &cbFs);
+    if (RT_FAILURE(rc))
+    {
+        RTTestIFailed("RTVfsFileQuerySize -> %Rrc", rc);
+        return rc;
+    }
+
+    while (off < cbFs)
+    {
+        bool fUsed = false;
+
+        rc = RTVfsQueryRangeState(hVfs, off, 1024, &fUsed);
+        if (RT_FAILURE(rc))
+        {
+            RTTestIFailed("RTVfsIsRangeInUse -> %Rrc", rc);
+            break;
+        }
+
+        if (fUsed)
+            cBlocksUsed++;
+        else
+            cBlocksUnused++;
+
+        off += 1024;
+    }
+
+    if (RT_SUCCESS(rc))
+        RTTestIPrintf(RTTESTLVL_ALWAYS, "%u blocks used and %u blocks unused\n",
+                      cBlocksUsed, cBlocksUnused);
+
+    RTVfsRelease(hVfs);
+
+    return rc;
+}
+
+int main(int argc, char **argv)
+{
+    /*
+     * Initialize IPRT and create the test.
+     */
+    RTTEST hTest;
+    int rc = RTTestInitAndCreate("tstRTFilesystem", &hTest);
+    if (rc)
+        return rc;
+    RTTestBanner(hTest);
+
+    /*
+     * If no args, display usage.
+     */
+    if (argc < 2)
+    {
+        RTTestPrintf(hTest, RTTESTLVL_ALWAYS, "Syntax: %s <image>\n", argv[0]);
+        return RTTestSkipAndDestroy(hTest, "Missing required arguments\n");
+    }
+
+    /* Open image. */
+    RTFILE hFile;
+    RTVFSFILE hVfsFile;
+    rc = RTFileOpen(&hFile, argv[1], RTFILE_O_OPEN | RTFILE_O_DENY_NONE | RTFILE_O_READ);
+    if (RT_FAILURE(rc))
+    {
+        RTTestIFailed("RTFileOpen -> %Rrc", rc);
+        return RTTestSummaryAndDestroy(hTest);
+    }
+
+    rc = RTVfsFileFromRTFile(hFile, 0, false, &hVfsFile);
+    if (RT_FAILURE(rc))
+    {
+        RTTestIFailed("RTVfsFileFromRTFile -> %Rrc", rc);
+        return RTTestSummaryAndDestroy(hTest);
+    }
+
+    rc = tstRTFilesystem(hTest, hVfsFile);
+
+    RTTESTI_CHECK(rc == VINF_SUCCESS);
+
+    RTVfsFileRelease(hVfsFile);
+
+    /*
+     * Summary
+     */
+    return RTTestSummaryAndDestroy(hTest);
+}
+