| 1 | /* $Id: RTFileSetAllocationSize-linux.cpp 90789 2021-08-23 10:27:29Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTFileSetAllocationSize, linux implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2016-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_FILE
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| 32 | #include <iprt/file.h>
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| 33 | #include "internal/iprt.h"
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| 34 |
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/errcore.h>
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| 37 |
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| 38 | #include <dlfcn.h>
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| 39 | #include <errno.h>
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| 40 | #include <unistd.h>
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| 41 | #include <sys/fcntl.h>
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| 42 |
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| 43 | /**
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| 44 | * The Linux specific fallocate() method.
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| 45 | */
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| 46 | typedef int (*PFNLNXFALLOCATE) (int iFd, int fMode, off_t offStart, off_t cb);
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| 47 | /** Flag to specify that the file size should not be extended. */
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| 48 | #define LNX_FALLOC_FL_KEEP_SIZE 1
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| 49 |
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| 50 | RTDECL(int) RTFileSetAllocationSize(RTFILE hFile, uint64_t cbSize, uint32_t fFlags)
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| 51 | {
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| 52 | AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_PARAMETER);
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| 53 | AssertReturn(!(fFlags & ~RTFILE_ALLOC_SIZE_F_VALID), VERR_INVALID_PARAMETER);
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| 54 | AssertMsgReturn(sizeof(off_t) >= sizeof(cbSize) || RT_HIDWORD(cbSize) == 0,
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| 55 | ("64-bit filesize not supported! cbSize=%lld\n", cbSize),
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| 56 | VERR_NOT_SUPPORTED);
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| 57 |
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| 58 | int rc;
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| 59 | PFNLNXFALLOCATE pfnLnxFAllocate = (PFNLNXFALLOCATE)(uintptr_t)dlsym(RTLD_DEFAULT, "fallocate64");
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| 60 | if (RT_VALID_PTR(pfnLnxFAllocate))
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| 61 | {
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| 62 | int fLnxFlags = (fFlags & RTFILE_ALLOC_SIZE_F_KEEP_SIZE) ? LNX_FALLOC_FL_KEEP_SIZE : 0;
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| 63 | int rcLnx = pfnLnxFAllocate(RTFileToNative(hFile), fLnxFlags, 0, cbSize);
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| 64 | if (rcLnx == 0)
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| 65 | rc = VINF_SUCCESS;
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| 66 | else if (errno == EOPNOTSUPP)
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| 67 | rc = VERR_NOT_SUPPORTED;
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| 68 | else
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| 69 | rc = RTErrConvertFromErrno(errno);
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| 70 | }
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| 71 | else
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| 72 | rc = VERR_NOT_SUPPORTED;
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| 73 |
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| 74 | return rc;
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| 75 | }
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| 76 | RT_EXPORT_SYMBOL(RTFileSetAllocationSize);
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