| 1 | /* $Id: dvm.h 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Disk Volume Management Internals.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 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 | #ifndef IPRT_INCLUDED_INTERNAL_dvm_h
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| 38 | #define IPRT_INCLUDED_INTERNAL_dvm_h
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| 39 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 40 | # pragma once
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| 41 | #endif
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| 42 |
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| 43 | #include <iprt/types.h>
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| 44 | #include <iprt/err.h>
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| 45 | #include <iprt/assert.h>
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| 46 | #include <iprt/vfs.h>
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| 47 | #include "internal/magics.h"
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| 48 |
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| 49 | RT_C_DECLS_BEGIN
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| 50 |
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| 51 | /** Format specific volume manager handle. */
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| 52 | typedef struct RTDVMFMTINTERNAL *RTDVMFMT;
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| 53 | /** Pointer to a format specific volume manager handle. */
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| 54 | typedef RTDVMFMT *PRTDVMFMT;
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| 55 | /** NIL volume manager handle. */
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| 56 | #define NIL_RTDVMFMT ((RTDVMFMT)~0)
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| 57 |
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| 58 | /** Format specific volume data handle. */
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| 59 | typedef struct RTDVMVOLUMEFMTINTERNAL *RTDVMVOLUMEFMT;
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| 60 | /** Pointer to a format specific volume data handle. */
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| 61 | typedef RTDVMVOLUMEFMT *PRTDVMVOLUMEFMT;
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| 62 | /** NIL volume handle. */
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| 63 | #define NIL_RTDVMVOLUMEFMT ((RTDVMVOLUMEFMT)~0)
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| 64 |
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| 65 | /**
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| 66 | * Disk descriptor.
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| 67 | */
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| 68 | typedef struct RTDVMDISK
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| 69 | {
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| 70 | /** Size of the disk in bytes. */
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| 71 | uint64_t cbDisk;
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| 72 | /** Sector size. */
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| 73 | uint64_t cbSector;
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| 74 | /** The VFS file handle if backed by such. */
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| 75 | RTVFSFILE hVfsFile;
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| 76 | } RTDVMDISK;
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| 77 | /** Pointer to a disk descriptor. */
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| 78 | typedef RTDVMDISK *PRTDVMDISK;
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| 79 | /** Pointer to a const descriptor. */
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| 80 | typedef const RTDVMDISK *PCRTDVMDISK;
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| 81 |
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| 82 | /** Score to indicate that the backend can't handle the format at all */
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| 83 | #define RTDVM_MATCH_SCORE_UNSUPPORTED 0
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| 84 | /** Score to indicate that a backend supports the format
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| 85 | * but there can be other backends. */
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| 86 | #define RTDVM_MATCH_SCORE_SUPPORTED (UINT32_MAX/2)
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| 87 | /** Score to indicate a perfect match. */
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| 88 | #define RTDVM_MATCH_SCORE_PERFECT UINT32_MAX
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| 89 |
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| 90 | /**
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| 91 | * Volume format operations.
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| 92 | */
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| 93 | typedef struct RTDVMFMTOPS
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| 94 | {
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| 95 | /** Name of the format. */
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| 96 | const char *pszFmt;
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| 97 | /** The format type. */
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| 98 | RTDVMFORMATTYPE enmFormat;
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| 99 |
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| 100 | /**
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| 101 | * Probes the given disk for known structures.
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| 102 | *
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| 103 | * @returns IPRT status code.
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| 104 | * @param pDisk Disk descriptor.
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| 105 | * @param puScore Where to store the match score on success.
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| 106 | */
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| 107 | DECLCALLBACKMEMBER(int, pfnProbe,(PCRTDVMDISK pDisk, uint32_t *puScore));
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| 108 |
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| 109 | /**
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| 110 | * Opens the format to set up all structures.
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| 111 | *
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| 112 | * @returns IPRT status code.
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| 113 | * @param pDisk The disk descriptor.
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| 114 | * @param phVolMgrFmt Where to store the volume format data on success.
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| 115 | */
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| 116 | DECLCALLBACKMEMBER(int, pfnOpen,(PCRTDVMDISK pDisk, PRTDVMFMT phVolMgrFmt));
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| 117 |
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| 118 | /**
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| 119 | * Initializes a new volume map.
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| 120 | *
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| 121 | * @returns IPRT status code.
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| 122 | * @param pDisk The disk descriptor.
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| 123 | * @param phVolMgrFmt Where to store the volume format data on success.
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| 124 | */
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| 125 | DECLCALLBACKMEMBER(int, pfnInitialize,(PCRTDVMDISK pDisk, PRTDVMFMT phVolMgrFmt));
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| 126 |
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| 127 | /**
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| 128 | * Closes the volume format.
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| 129 | *
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| 130 | * @returns nothing.
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| 131 | * @param hVolMgrFmt The format specific volume manager handle.
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| 132 | */
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| 133 | DECLCALLBACKMEMBER(void, pfnClose,(RTDVMFMT hVolMgrFmt));
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| 134 |
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| 135 | /**
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| 136 | * Returns whether the given range is in use by the volume manager.
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| 137 | *
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| 138 | * @returns IPRT status code.
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| 139 | * @param hVolMgrFmt The format specific volume manager handle.
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| 140 | * @param offStart Start offset of the range.
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| 141 | * @param cbRange Size of the range to check in bytes.
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| 142 | * @param pfUsed Where to store whether the range is in use by the
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| 143 | * volume manager.
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| 144 | */
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| 145 | DECLCALLBACKMEMBER(int, pfnQueryRangeUse,(RTDVMFMT hVolMgrFmt,
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| 146 | uint64_t off, uint64_t cbRange,
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| 147 | bool *pfUsed));
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| 148 |
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| 149 | /**
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| 150 | * Optional: Query the uuid of the current disk if applicable.
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| 151 | *
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| 152 | * @returns IPRT status code.
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| 153 | * @retval VERR_NOT_SUPPORTED if the partition scheme doesn't do UUIDs.
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| 154 | * @param hVolMgrFmt The format specific volume manager handle.
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| 155 | * @param pUuid Where to return the UUID.
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| 156 | */
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| 157 | DECLCALLBACKMEMBER(int, pfnQueryDiskUuid,(RTDVMFMT hVolMgrFmt, PRTUUID pUuid));
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| 158 |
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| 159 | /**
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| 160 | * Gets the number of valid volumes in the map.
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| 161 | *
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| 162 | * @returns Number of valid volumes in the map or UINT32_MAX on failure.
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| 163 | * @param hVolMgrFmt The format specific volume manager handle.
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| 164 | */
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| 165 | DECLCALLBACKMEMBER(uint32_t, pfnGetValidVolumes,(RTDVMFMT hVolMgrFmt));
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| 166 |
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| 167 | /**
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| 168 | * Gets the maximum number of volumes the map can have.
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| 169 | *
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| 170 | * @returns Maximum number of volumes in the map or 0 on failure.
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| 171 | * @param hVolMgrFmt The format specific volume manager handle.
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| 172 | */
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| 173 | DECLCALLBACKMEMBER(uint32_t, pfnGetMaxVolumes,(RTDVMFMT hVolMgrFmt));
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| 174 |
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| 175 | /**
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| 176 | * Get the first valid volume from a map.
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| 177 | *
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| 178 | * @returns IPRT status code.
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| 179 | * @param hVolMgrFmt The format specific volume manager handle.
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| 180 | * @param phVolFmt Where to store the volume handle to the first volume
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| 181 | * on success.
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| 182 | */
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| 183 | DECLCALLBACKMEMBER(int, pfnQueryFirstVolume,(RTDVMFMT hVolMgrFmt, PRTDVMVOLUMEFMT phVolFmt));
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| 184 |
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| 185 | /**
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| 186 | * Get the first valid volume from a map.
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| 187 | *
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| 188 | * @returns IPRT status code.
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| 189 | * @param hVolMgrFmt The format specific volume manager handle.
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| 190 | * @param hVolFmt The current volume.
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| 191 | * @param phVolFmtNext Where to store the handle to the format specific
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| 192 | * volume data of the next volume on success.
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| 193 | */
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| 194 | DECLCALLBACKMEMBER(int, pfnQueryNextVolume,(RTDVMFMT hVolMgrFmt, RTDVMVOLUMEFMT hVolFmt, PRTDVMVOLUMEFMT phVolFmtNext));
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| 195 |
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| 196 | /**
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| 197 | * Query the partition table locations.
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| 198 | *
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| 199 | * @returns IPRT status code.
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| 200 | * @retval VERR_BUFFER_OVERFLOW if the table is too small, @a *pcActual will be
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| 201 | * set to the required size.
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| 202 | * @retval VERR_BUFFER_UNDERFLOW if the table is too big and @a pcActual is
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| 203 | * NULL.
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| 204 | * @param hVolMgrFmt The format specific volume manager handle.
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| 205 | * @param fFlags Flags, see RTDVMMAPQTABLOC_F_XXX.
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| 206 | * @param paLocations Where to return the info. Ignored if @a cLocations
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| 207 | * is zero, then only @a pcActual matters.
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| 208 | * @param cLocations The size of @a paLocations in items.
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| 209 | * @param pcActual Where to return the actual number of locations, or
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| 210 | * on VERR_BUFFER_OVERFLOW the necessary table size.
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| 211 | * Optional, when not specified the cLocations value
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| 212 | * must match exactly or it fails with
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| 213 | * VERR_BUFFER_UNDERFLOW.
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| 214 | * @sa RTDvmMapQueryTableLocations
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| 215 | */
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| 216 | DECLCALLBACKMEMBER(int, pfnQueryTableLocations,(RTDVMFMT hVolMgrFmt, uint32_t fFlags, PRTDVMTABLELOCATION paLocations,
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| 217 | size_t cLocations, size_t *pcActual));
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| 218 |
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| 219 | /**
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| 220 | * Closes a volume handle.
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| 221 | *
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| 222 | * @returns nothing.
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| 223 | * @param hVolFmt The format specific volume handle.
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| 224 | */
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| 225 | DECLCALLBACKMEMBER(void, pfnVolumeClose,(RTDVMVOLUMEFMT hVolFmt));
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| 226 |
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| 227 | /**
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| 228 | * Gets the size of the given volume.
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| 229 | *
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| 230 | * @returns Size of the volume in bytes or 0 on failure.
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| 231 | * @param hVolFmt The format specific volume handle.
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| 232 | */
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| 233 | DECLCALLBACKMEMBER(uint64_t, pfnVolumeGetSize,(RTDVMVOLUMEFMT hVolFmt));
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| 234 |
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| 235 | /**
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| 236 | * Queries the name of the given volume.
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| 237 | *
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| 238 | * @returns IPRT status code.
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| 239 | * @param hVolFmt The format specific volume handle.
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| 240 | * @param ppszVolname Where to store the name of the volume on success.
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| 241 | */
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| 242 | DECLCALLBACKMEMBER(int, pfnVolumeQueryName,(RTDVMVOLUMEFMT hVolFmt, char **ppszVolName));
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| 243 |
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| 244 | /**
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| 245 | * Get the type of the given volume.
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| 246 | *
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| 247 | * @returns The volume type on success, DVMVOLTYPE_INVALID if hVol is invalid.
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| 248 | * @param hVolFmt The format specific volume handle.
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| 249 | */
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| 250 | DECLCALLBACKMEMBER(RTDVMVOLTYPE, pfnVolumeGetType,(RTDVMVOLUMEFMT hVolFmt));
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| 251 |
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| 252 | /**
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| 253 | * Get the flags of the given volume.
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| 254 | *
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| 255 | * @returns The volume flags or UINT64_MAX on failure.
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| 256 | * @param hVolFmt The format specific volume handle.
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| 257 | */
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| 258 | DECLCALLBACKMEMBER(uint64_t, pfnVolumeGetFlags,(RTDVMVOLUMEFMT hVolFmt));
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| 259 |
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| 260 | /**
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| 261 | * Queries the range of the given volume on the underyling medium.
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| 262 | *
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| 263 | * @returns IPRT status code.
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| 264 | * @param hVolFmt The format specific volume handle.
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| 265 | * @param poffStart Where to store the start byte offset on the
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| 266 | * underlying medium.
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| 267 | * @param poffLast Where to store the last byte offset on the
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| 268 | * underlying medium (inclusive).
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| 269 | */
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| 270 | DECLCALLBACKMEMBER(int, pfnVolumeQueryRange,(RTDVMVOLUMEFMT hVolFmt, uint64_t *poffStart, uint64_t *poffLast));
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| 271 |
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| 272 | /**
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| 273 | * Returns whether the supplied range is at least partially intersecting
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| 274 | * with the given volume.
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| 275 | *
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| 276 | * @returns whether the range intersects with the volume.
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| 277 | * @param hVolFmt The format specific volume handle.
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| 278 | * @param offStart Start offset of the range.
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| 279 | * @param cbRange Size of the range to check in bytes.
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| 280 | * @param poffVol Where to store the offset of the range from the
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| 281 | * start of the volume if true is returned.
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| 282 | * @param pcbIntersect Where to store the number of bytes intersecting
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| 283 | * with the range if true is returned.
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| 284 | */
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| 285 | DECLCALLBACKMEMBER(bool, pfnVolumeIsRangeIntersecting,(RTDVMVOLUMEFMT hVolFmt,
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| 286 | uint64_t offStart, size_t cbRange,
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| 287 | uint64_t *poffVol,
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| 288 | uint64_t *pcbIntersect));
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| 289 |
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| 290 | /**
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| 291 | * Queries the range of the partition table the volume belongs to on the underlying medium.
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| 292 | *
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| 293 | * @returns IPRT status code.
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| 294 | * @param hVolFmt The format specific volume handle.
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| 295 | * @param poffTable Where to return the byte offset on the underlying
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| 296 | * media of the (partition/volume/whatever) table.
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| 297 | * @param pcbTable Where to return the table size in bytes. This
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| 298 | * typically includes alignment padding.
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| 299 | * @sa RTDvmVolumeQueryTableLocation
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| 300 | */
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| 301 | DECLCALLBACKMEMBER(int, pfnVolumeQueryTableLocation,(RTDVMVOLUMEFMT hVolFmt, uint64_t *poffStart, uint64_t *poffLast));
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| 302 |
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| 303 | /**
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| 304 | * Gets the tiven index for the specified volume.
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| 305 | *
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| 306 | * @returns The requested index. UINT32_MAX on failure.
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| 307 | * @param hVolFmt The format specific volume handle.
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| 308 | * @param enmIndex The index to get. Never RTDVMVOLIDX_HOST.
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| 309 | * @sa RTDvmVolumeGetIndex
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| 310 | */
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| 311 | DECLCALLBACKMEMBER(uint32_t, pfnVolumeGetIndex,(RTDVMVOLUMEFMT hVolFmt, RTDVMVOLIDX enmIndex));
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| 312 |
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| 313 | /**
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| 314 | * Query a generic volume property.
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| 315 | *
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| 316 | * This is an extensible interface for retriving mostly format specific
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| 317 | * information, or information that's not commonly used. (It's modelled after
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| 318 | * RTLdrQueryPropEx.)
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| 319 | *
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| 320 | * @returns IPRT status code.
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| 321 | * @retval VERR_NOT_SUPPORTED if the property query isn't supported (either all
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| 322 | * or that specific property). The caller must handle this result.
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| 323 | * @retval VERR_NOT_FOUND is currently not returned, but intended for cases
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| 324 | * where it wasn't present in the tables.
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| 325 | * @retval VERR_INVALID_FUNCTION if the @a enmProperty value is wrong.
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| 326 | * @retval VERR_INVALID_PARAMETER if the fixed buffer size is wrong. Correct
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| 327 | * size in @a *pcbBuf.
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| 328 | * @retval VERR_BUFFER_OVERFLOW if the property doesn't have a fixed size
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| 329 | * buffer and the buffer isn't big enough. Correct size in @a *pcbBuf.
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| 330 | * @retval VERR_INVALID_HANDLE if the handle is invalid.
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| 331 | *
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| 332 | * @param hVolFmt Handle to the volume.
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| 333 | * @param enmProperty The property to query.
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| 334 | * @param pvBuf Pointer to the input / output buffer. In most cases
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| 335 | * it's only used for returning data.
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| 336 | * @param cbBuf The size of the buffer. This is validated by the common
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| 337 | * code for all fixed typed & sized properties. The
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| 338 | * interger properties may have several supported sizes, in
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| 339 | * which case the user value is passed along as-is but it
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| 340 | * is okay to return a smaller amount of data. The common
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| 341 | * code will make upcast the data.
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| 342 | * @param pcbBuf Where to return the amount of data returned. This must
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| 343 | * be set even for fixed type/sized data.
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| 344 | * @sa RTDvmVolumeQueryProp, RTDvmVolumeGetPropU64
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| 345 | */
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| 346 | DECLCALLBACKMEMBER(int, pfnVolumeQueryProp,(RTDVMVOLUMEFMT hVolFmt, RTDVMVOLPROP enmProperty,
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| 347 | void *pvBuf, size_t cbBuf, size_t *pcbBuf));
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| 348 |
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| 349 | /**
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| 350 | * Read data from the given volume.
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| 351 | *
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| 352 | * @returns IPRT status code.
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| 353 | * @param hVolFmt The format specific volume handle.
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| 354 | * @param off Where to start reading from.
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| 355 | * @param pvBuf Where to store the read data.
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| 356 | * @param cbRead How many bytes to read.
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| 357 | */
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| 358 | DECLCALLBACKMEMBER(int, pfnVolumeRead,(RTDVMVOLUMEFMT hVolFmt, uint64_t off, void *pvBuf, size_t cbRead));
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| 359 |
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| 360 | /**
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| 361 | * Write data to the given volume.
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| 362 | *
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| 363 | * @returns IPRT status code.
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| 364 | * @param hVolFmt The format specific volume handle.
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| 365 | * @param off Where to start writing to.
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| 366 | * @param pvBuf The data to write.
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| 367 | * @param cbWrite How many bytes to write.
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| 368 | */
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| 369 | DECLCALLBACKMEMBER(int, pfnVolumeWrite,(RTDVMVOLUMEFMT hVolFmt, uint64_t off, const void *pvBuf, size_t cbWrite));
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| 370 |
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| 371 | } RTDVMFMTOPS;
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| 372 | /** Pointer to a DVM ops table. */
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| 373 | typedef RTDVMFMTOPS *PRTDVMFMTOPS;
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| 374 | /** Pointer to a const DVM ops table. */
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| 375 | typedef const RTDVMFMTOPS *PCRTDVMFMTOPS;
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| 376 |
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| 377 | /** Checks whether a range is intersecting. */
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| 378 | #define RTDVM_RANGE_IS_INTERSECTING(start, size, off) ( (start) <= (off) && ((start) + (size)) > (off) )
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| 379 |
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| 380 | /** Converts a LBA number to the byte offset. */
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| 381 | #define RTDVM_LBA2BYTE(lba, disk) ((lba) * (disk)->cbSector)
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| 382 | /** Converts a Byte offset to the LBA number. */
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| 383 | #define RTDVM_BYTE2LBA(off, disk) ((off) / (disk)->cbSector)
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| 384 |
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| 385 | /**
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| 386 | * Returns the number of sectors in the disk.
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| 387 | *
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| 388 | * @returns Number of sectors.
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| 389 | * @param pDisk The disk descriptor.
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| 390 | */
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| 391 | DECLINLINE(uint64_t) rtDvmDiskGetSectors(PCRTDVMDISK pDisk)
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| 392 | {
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| 393 | return pDisk->cbDisk / pDisk->cbSector;
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| 394 | }
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| 395 |
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| 396 | /**
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| 397 | * Read from the disk at the given offset.
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| 398 | *
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| 399 | * @returns IPRT status code.
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| 400 | * @param pDisk The disk descriptor to read from.
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| 401 | * @param off Start offset.
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| 402 | * @param pvBuf Destination buffer.
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| 403 | * @param cbRead How much to read.
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| 404 | * @sa rtDvmDiskReadUnaligned
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| 405 | */
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| 406 | DECLINLINE(int) rtDvmDiskRead(PCRTDVMDISK pDisk, uint64_t off, void *pvBuf, size_t cbRead)
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| 407 | {
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| 408 | AssertPtrReturn(pDisk, VERR_INVALID_POINTER);
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| 409 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
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| 410 | AssertReturn(cbRead > 0, VERR_INVALID_PARAMETER);
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| 411 | AssertReturn(off + cbRead <= pDisk->cbDisk, VERR_INVALID_PARAMETER);
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| 412 |
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| 413 | /* Use RTVfsFileReadAt if these triggers: */
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| 414 | Assert(!(cbRead % pDisk->cbSector));
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| 415 | Assert(!(off % pDisk->cbSector));
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| 416 |
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| 417 | return RTVfsFileReadAt(pDisk->hVfsFile, off, pvBuf, cbRead, NULL /*pcbRead*/);
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| 418 | }
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| 419 |
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| 420 | DECLHIDDEN(int) rtDvmDiskReadUnaligned(PCRTDVMDISK pDisk, uint64_t off, void *pvBuf, size_t cbRead);
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| 421 |
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| 422 | /**
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| 423 | * Write to the disk at the given offset.
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| 424 | *
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| 425 | * @returns IPRT status code.
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| 426 | * @param pDisk The disk descriptor to write to.
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| 427 | * @param off Start offset.
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| 428 | * @param pvBuf Source buffer.
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| 429 | * @param cbWrite How much to write.
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| 430 | */
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| 431 | DECLINLINE(int) rtDvmDiskWrite(PCRTDVMDISK pDisk, uint64_t off, const void *pvBuf, size_t cbWrite)
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| 432 | {
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| 433 | AssertPtrReturn(pDisk, VERR_INVALID_POINTER);
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| 434 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
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| 435 | AssertReturn(cbWrite > 0, VERR_INVALID_PARAMETER);
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| 436 | AssertReturn(off + cbWrite <= pDisk->cbDisk, VERR_INVALID_PARAMETER);
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| 437 |
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| 438 | /* Write RTVfsFileReadAt if these triggers: */
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| 439 | Assert(!(cbWrite % pDisk->cbSector));
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| 440 | Assert(!(off % pDisk->cbSector));
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| 441 |
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| 442 | return RTVfsFileWriteAt(pDisk->hVfsFile, off, pvBuf, cbWrite, NULL /*pcbWritten*/);
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| 443 | }
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| 444 |
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| 445 | extern DECL_HIDDEN_DATA(const RTDVMFMTOPS) g_rtDvmFmtMbr;
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| 446 | extern DECL_HIDDEN_DATA(const RTDVMFMTOPS) g_rtDvmFmtGpt;
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| 447 | extern DECL_HIDDEN_DATA(const RTDVMFMTOPS) g_rtDvmFmtBsdLbl;
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| 448 |
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| 449 | RT_C_DECLS_END
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| 450 |
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| 451 | #endif /* !IPRT_INCLUDED_INTERNAL_dvm_h */
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| 452 |
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