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/* $Id$ */
/** @file
* IPRT - RTFileSetAllocationSize, linux implementation.
*/
/*
* Copyright (C) 2016-2022 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 <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);
AssertMsgReturn(sizeof(off_t) >= sizeof(cbSize) || RT_HIDWORD(cbSize) == 0,
("64-bit filesize not supported! cbSize=%lld\n", cbSize),
VERR_NOT_SUPPORTED);
int rc;
PFNLNXFALLOCATE pfnLnxFAllocate = (PFNLNXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "fallocate64");
if (RT_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)
rc = VINF_SUCCESS;
else if (errno == EOPNOTSUPP)
rc = VERR_NOT_SUPPORTED;
else
rc = RTErrConvertFromErrno(errno);
}
else
rc = VERR_NOT_SUPPORTED;
return rc;
}
RT_EXPORT_SYMBOL(RTFileSetAllocationSize);
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