1 files changed, 77 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/RTFileSetAllocationSize-posix.cpp b/src/VBox/Runtime/r3/posix/RTFileSetAllocationSize-posix.cpp
new file mode 100644
index 00000000..12c79f9f
--- /dev/null
+++ b/src/VBox/Runtime/r3/posix/RTFileSetAllocationSize-posix.cpp
@@ -0,0 +1,77 @@
+/* $Id: RTFileSetAllocationSize-posix.cpp $ */
+/** @file
+ * IPRT - RTFileSetAllocationSize, linux implementation.
+ */
+
+/*
+ * Copyright (C) 2016-2020 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                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_FILE
+#include <iprt/file.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+/**
+ * The posix_fallocate() method.
+ */
+typedef int (*PFNPOSIXFALLOCATE) (int iFd, off_t offStart, off_t cb);
+
+RTDECL(int) RTFileSetAllocationSize(RTFILE hFile, uint64_t cbSize, uint32_t fFlags)
+{
+    AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & ~RTFILE_ALLOC_SIZE_F_VALID), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(sizeof(off_t) >= sizeof(cbSize) ||  RT_HIDWORD(cbSize) == 0,
+                    ("64-bit filesize not supported! cbSize=%lld\n", cbSize),
+                    VERR_NOT_SUPPORTED);
+
+    if (fFlags & RTFILE_ALLOC_SIZE_F_KEEP_SIZE)
+        return VERR_NOT_SUPPORTED;
+
+    int rc = VINF_SUCCESS;
+    PFNPOSIXFALLOCATE pfnPosixFAllocate = (PFNPOSIXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "posix_fallocate");
+    if (VALID_PTR(pfnPosixFAllocate))
+    {
+        int rcPosix = pfnPosixFAllocate(RTFileToNative(hFile), 0, cbSize);
+        if (rcPosix != 0)
+        {
+            if (errno == EOPNOTSUPP)
+                rc = VERR_NOT_SUPPORTED;
+            else
+                rc = RTErrConvertFromErrno(errno);
+        }
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTFileSetAllocationSize);