VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/linux/RTFileSetAllocationSize-linux.cpp@ 80484

Last change on this file since 80484 was 76553, checked in by vboxsync, 6 years ago

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  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.9 KB
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1/* $Id: RTFileSetAllocationSize-linux.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2/** @file
3 * IPRT - RTFileSetAllocationSize, linux implementation.
4 */
5
6/*
7 * Copyright (C) 2016-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#define LOG_GROUP RTLOGGROUP_FILE
32#include <iprt/file.h>
33#include "internal/iprt.h"
34
35#include <iprt/assert.h>
36#include <iprt/errcore.h>
37
38#include <dlfcn.h>
39#include <errno.h>
40#include <unistd.h>
41#include <sys/fcntl.h>
42
43/**
44 * The Linux specific fallocate() method.
45 */
46typedef int (*PFNLNXFALLOCATE) (int iFd, int fMode, off_t offStart, off_t cb);
47/** Flag to specify that the file size should not be extended. */
48#define LNX_FALLOC_FL_KEEP_SIZE 1
49
50RTDECL(int) RTFileSetAllocationSize(RTFILE hFile, uint64_t cbSize, uint32_t fFlags)
51{
52 AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_PARAMETER);
53 AssertReturn(!(fFlags & ~RTFILE_ALLOC_SIZE_F_VALID), VERR_INVALID_PARAMETER);
54 AssertMsgReturn(sizeof(off_t) >= sizeof(cbSize) || RT_HIDWORD(cbSize) == 0,
55 ("64-bit filesize not supported! cbSize=%lld\n", cbSize),
56 VERR_NOT_SUPPORTED);
57
58 int rc = VINF_SUCCESS;
59 PFNLNXFALLOCATE pfnLnxFAllocate = (PFNLNXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "fallocate64");
60 if (VALID_PTR(pfnLnxFAllocate))
61 {
62 int fLnxFlags = (fFlags & RTFILE_ALLOC_SIZE_F_KEEP_SIZE) ? LNX_FALLOC_FL_KEEP_SIZE : 0;
63 int rcLnx = pfnLnxFAllocate(RTFileToNative(hFile), fLnxFlags, 0, cbSize);
64 if (rcLnx != 0)
65 {
66 if (errno == EOPNOTSUPP)
67 rc = VERR_NOT_SUPPORTED;
68 else
69 rc = RTErrConvertFromErrno(errno);
70 }
71 }
72 else
73 rc = VERR_NOT_SUPPORTED;
74
75 return rc;
76}
77RT_EXPORT_SYMBOL(RTFileSetAllocationSize);
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