IPRT: Linux specific implementation for RTFileSetAllocationSize()

git-svn-id: https://www.virtualbox.org/svn/vbox/trunk@59461 cfe28804-0f27-0410-a406-dd0f0b0b656f

1 files changed, 84 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/linux/RTFileSetAllocationSize-linux.cpp b/src/VBox/Runtime/r3/linux/RTFileSetAllocationSize-linux.cpp
new file mode 100644
index 00000000000..d6f7212de8c
--- /dev/null
+++ b/src/VBox/Runtime/r3/linux/RTFileSetAllocationSize-linux.cpp
@@ -0,0 +1,84 @@
+/* $Id$ */
+/** @file
+ * IPRT - RTFileSetAllocationSize, linux implementation.
+ */
+
+/*
+ * Copyright (C) 2016 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/err.h>
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/fcntl.h>
+
+/**
+ * The Linux specific fallocate() method.
+ */
+typedef int (*PFNLNXFALLOCATE) (int iFd, int fMode, off_t offStart, off_t cb);
+/** Flag to specify that the file size should not be extended. */
+#define LNX_FALLOC_FL_KEEP_SIZE 1
+
+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);
+
+    /*
+     * Validate offset.
+     */
+    if (    sizeof(off_t) < sizeof(cbSize)
+        &&  (cbSize >> 32) != 0)
+    {
+        AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
+        return VERR_NOT_SUPPORTED;
+    }
+
+    int rc = VINF_SUCCESS;
+    PFNLNXFALLOCATE pfnLnxFAllocate = (PFNLNXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "fallocate");
+    if (VALID_PTR(pfnLnxFAllocate))
+    {
+        int fLnxFlags = (fFlags & RTFILE_ALLOC_SIZE_F_KEEP_SIZE) ? LNX_FALLOC_FL_KEEP_SIZE : 0;
+        int rcLnx = pfnLnxFAllocate(RTFileToNative(hFile), fLnxFlags, 0, cbSize);
+        if (rcLnx != 0)
+        {
+            if (errno == EOPNOTSUPP)
+                rc = VERR_NOT_SUPPORTED;
+            else
+                rc = RTErrConvertFromErrno(errno);
+        }
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTFileSetAllocationSize);