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