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source: vbox/trunk/src/VBox/Runtime/r3/linux/RTFileSetAllocationSize-linux.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 2 years ago

Copyright year updates by scm.

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1/* $Id: RTFileSetAllocationSize-linux.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - RTFileSetAllocationSize, linux implementation.
4 */
5
6/*
7 * Copyright (C) 2016-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#define LOG_GROUP RTLOGGROUP_FILE
42#include <iprt/file.h>
43#include "internal/iprt.h"
44
45#include <iprt/assert.h>
46#include <iprt/errcore.h>
47
48#include <dlfcn.h>
49#include <errno.h>
50#include <unistd.h>
51#include <sys/fcntl.h>
52
53/**
54 * The Linux specific fallocate() method.
55 */
56typedef int (*PFNLNXFALLOCATE) (int iFd, int fMode, off_t offStart, off_t cb);
57/** Flag to specify that the file size should not be extended. */
58#define LNX_FALLOC_FL_KEEP_SIZE 1
59
60RTDECL(int) RTFileSetAllocationSize(RTFILE hFile, uint64_t cbSize, uint32_t fFlags)
61{
62 AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_PARAMETER);
63 AssertReturn(!(fFlags & ~RTFILE_ALLOC_SIZE_F_VALID), VERR_INVALID_PARAMETER);
64 AssertMsgReturn(sizeof(off_t) >= sizeof(cbSize) || RT_HIDWORD(cbSize) == 0,
65 ("64-bit filesize not supported! cbSize=%lld\n", cbSize),
66 VERR_NOT_SUPPORTED);
67
68 int rc;
69 PFNLNXFALLOCATE pfnLnxFAllocate = (PFNLNXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "fallocate64");
70 if (RT_VALID_PTR(pfnLnxFAllocate))
71 {
72 int fLnxFlags = (fFlags & RTFILE_ALLOC_SIZE_F_KEEP_SIZE) ? LNX_FALLOC_FL_KEEP_SIZE : 0;
73 int rcLnx = pfnLnxFAllocate(RTFileToNative(hFile), fLnxFlags, 0, cbSize);
74 if (rcLnx == 0)
75 rc = VINF_SUCCESS;
76 else if (errno == EOPNOTSUPP)
77 rc = VERR_NOT_SUPPORTED;
78 else
79 rc = RTErrConvertFromErrno(errno);
80 }
81 else
82 rc = VERR_NOT_SUPPORTED;
83
84 return rc;
85}
86RT_EXPORT_SYMBOL(RTFileSetAllocationSize);
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