1 | /* $Id: VHD.cpp 68787 2017-09-19 08:53:40Z vboxsync $ */
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2 | /** @file
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3 | * VHD Disk image, Core Code.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2016 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 |
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18 |
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19 | /*********************************************************************************************************************************
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20 | * Header Files *
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21 | *********************************************************************************************************************************/
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22 | #define LOG_GROUP LOG_GROUP_VD_VHD
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23 | #include <VBox/vd-plugin.h>
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24 | #include <VBox/err.h>
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25 |
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26 | #include <VBox/log.h>
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27 | #include <VBox/version.h>
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28 | #include <iprt/asm.h>
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29 | #include <iprt/assert.h>
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30 | #include <iprt/mem.h>
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31 | #include <iprt/uuid.h>
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32 | #include <iprt/path.h>
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33 | #include <iprt/string.h>
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34 |
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35 | #include "VDBackends.h"
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36 |
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37 | #define VHD_RELATIVE_MAX_PATH 512
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38 | #define VHD_ABSOLUTE_MAX_PATH 512
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39 |
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40 | #define VHD_SECTOR_SIZE 512
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41 | #define VHD_BLOCK_SIZE (2 * _1M)
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42 |
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43 | /* This is common to all VHD disk types and is located at the end of the image */
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44 | #pragma pack(1)
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45 | typedef struct VHDFooter
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46 | {
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47 | char Cookie[8];
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48 | uint32_t Features;
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49 | uint32_t Version;
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50 | uint64_t DataOffset;
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51 | uint32_t Timestamp;
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52 | uint8_t CreatorApp[4];
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53 | uint32_t CreatorVer;
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54 | uint32_t CreatorOS;
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55 | uint64_t OrigSize;
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56 | uint64_t CurSize;
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57 | uint16_t DiskGeometryCylinder;
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58 | uint8_t DiskGeometryHeads;
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59 | uint8_t DiskGeometrySectors;
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60 | uint32_t DiskType;
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61 | uint32_t Checksum;
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62 | char UniqueID[16];
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63 | uint8_t SavedState;
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64 | uint8_t Reserved[427];
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65 | } VHDFooter;
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66 | #pragma pack()
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67 |
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68 | /* this really is spelled with only one n */
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69 | #define VHD_FOOTER_COOKIE "conectix"
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70 | #define VHD_FOOTER_COOKIE_SIZE 8
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71 |
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72 | #define VHD_FOOTER_FEATURES_NOT_ENABLED 0
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73 | #define VHD_FOOTER_FEATURES_TEMPORARY 1
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74 | #define VHD_FOOTER_FEATURES_RESERVED 2
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75 |
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76 | #define VHD_FOOTER_FILE_FORMAT_VERSION 0x00010000
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77 | #define VHD_FOOTER_DATA_OFFSET_FIXED UINT64_C(0xffffffffffffffff)
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78 | #define VHD_FOOTER_DISK_TYPE_FIXED 2
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79 | #define VHD_FOOTER_DISK_TYPE_DYNAMIC 3
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80 | #define VHD_FOOTER_DISK_TYPE_DIFFERENCING 4
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81 |
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82 | #define VHD_MAX_LOCATOR_ENTRIES 8
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83 | #define VHD_PLATFORM_CODE_NONE 0
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84 | #define VHD_PLATFORM_CODE_WI2R 0x57693272
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85 | #define VHD_PLATFORM_CODE_WI2K 0x5769326B
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86 | #define VHD_PLATFORM_CODE_W2RU 0x57327275
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87 | #define VHD_PLATFORM_CODE_W2KU 0x57326B75
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88 | #define VHD_PLATFORM_CODE_MAC 0x4D163220
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89 | #define VHD_PLATFORM_CODE_MACX 0x4D163258
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90 |
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91 | /* Header for expanding disk images. */
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92 | #pragma pack(1)
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93 | typedef struct VHDParentLocatorEntry
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94 | {
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95 | uint32_t u32Code;
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96 | uint32_t u32DataSpace;
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97 | uint32_t u32DataLength;
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98 | uint32_t u32Reserved;
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99 | uint64_t u64DataOffset;
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100 | } VHDPLE, *PVHDPLE;
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101 |
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102 | typedef struct VHDDynamicDiskHeader
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103 | {
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104 | char Cookie[8];
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105 | uint64_t DataOffset;
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106 | uint64_t TableOffset;
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107 | uint32_t HeaderVersion;
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108 | uint32_t MaxTableEntries;
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109 | uint32_t BlockSize;
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110 | uint32_t Checksum;
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111 | uint8_t ParentUuid[16];
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112 | uint32_t ParentTimestamp;
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113 | uint32_t Reserved0;
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114 | uint16_t ParentUnicodeName[256];
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115 | VHDPLE ParentLocatorEntry[VHD_MAX_LOCATOR_ENTRIES];
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116 | uint8_t Reserved1[256];
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117 | } VHDDynamicDiskHeader;
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118 | #pragma pack()
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119 |
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120 | #define VHD_DYNAMIC_DISK_HEADER_COOKIE "cxsparse"
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121 | #define VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE 8
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122 | #define VHD_DYNAMIC_DISK_HEADER_VERSION 0x00010000
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123 |
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124 | /**
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125 | * Complete VHD image data structure.
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126 | */
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127 | typedef struct VHDIMAGE
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128 | {
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129 | /** Image file name. */
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130 | const char *pszFilename;
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131 | /** Opaque storage handle. */
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132 | PVDIOSTORAGE pStorage;
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133 |
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134 | /** Pointer to the per-disk VD interface list. */
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135 | PVDINTERFACE pVDIfsDisk;
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136 | /** Pointer to the per-image VD interface list. */
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137 | PVDINTERFACE pVDIfsImage;
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138 | /** Error interface. */
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139 | PVDINTERFACEERROR pIfError;
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140 | /** I/O interface. */
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141 | PVDINTERFACEIOINT pIfIo;
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142 |
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143 | /** Open flags passed by VBoxHDD layer. */
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144 | unsigned uOpenFlags;
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145 | /** Image flags defined during creation or determined during open. */
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146 | unsigned uImageFlags;
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147 | /** Total size of the image. */
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148 | uint64_t cbSize;
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149 |
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150 | /** Physical geometry of this image. */
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151 | VDGEOMETRY PCHSGeometry;
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152 | /** Logical geometry of this image. */
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153 | VDGEOMETRY LCHSGeometry;
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154 |
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155 | /** Image UUID. */
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156 | RTUUID ImageUuid;
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157 | /** Parent image UUID. */
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158 | RTUUID ParentUuid;
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159 |
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160 | /** Parent's time stamp at the time of image creation. */
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161 | uint32_t u32ParentTimestamp;
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162 | /** Relative path to the parent image. */
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163 | char *pszParentFilename;
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164 |
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165 | /** The Block Allocation Table. */
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166 | uint32_t *pBlockAllocationTable;
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167 | /** Number of entries in the table. */
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168 | uint32_t cBlockAllocationTableEntries;
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169 |
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170 | /** Size of one data block. */
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171 | uint32_t cbDataBlock;
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172 | /** Sectors per data block. */
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173 | uint32_t cSectorsPerDataBlock;
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174 | /** Length of the sector bitmap in bytes. */
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175 | uint32_t cbDataBlockBitmap;
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176 | /** A copy of the disk footer. */
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177 | VHDFooter vhdFooterCopy;
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178 | /** Current end offset of the file (without the disk footer). */
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179 | uint64_t uCurrentEndOfFile;
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180 | /** Size of the data block bitmap in sectors. */
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181 | uint32_t cDataBlockBitmapSectors;
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182 | /** Start of the block allocation table. */
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183 | uint64_t uBlockAllocationTableOffset;
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184 | /** Buffer to hold block's bitmap for bit search operations. */
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185 | uint8_t *pu8Bitmap;
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186 | /** Offset to the next data structure (dynamic disk header). */
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187 | uint64_t u64DataOffset;
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188 | /** Flag to force dynamic disk header update. */
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189 | bool fDynHdrNeedsUpdate;
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190 | /** The static region list. */
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191 | VDREGIONLIST RegionList;
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192 | } VHDIMAGE, *PVHDIMAGE;
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193 |
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194 | /**
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195 | * Structure tracking the expansion process of the image
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196 | * for async access.
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197 | */
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198 | typedef struct VHDIMAGEEXPAND
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199 | {
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200 | /** Flag indicating the status of each step. */
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201 | volatile uint32_t fFlags;
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202 | /** The index in the block allocation table which is written. */
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203 | uint32_t idxBatAllocated;
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204 | /** Big endian representation of the block index
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205 | * which is written in the BAT. */
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206 | uint32_t idxBlockBe;
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207 | /** Old end of the file - used for rollback in case of an error. */
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208 | uint64_t cbEofOld;
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209 | /** Sector bitmap written to the new block - variable in size. */
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210 | uint8_t au8Bitmap[1];
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211 | } VHDIMAGEEXPAND, *PVHDIMAGEEXPAND;
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212 |
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213 | /**
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214 | * Flag defines
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215 | */
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216 | #define VHDIMAGEEXPAND_STEP_IN_PROGRESS (0x0)
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217 | #define VHDIMAGEEXPAND_STEP_FAILED (0x2)
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218 | #define VHDIMAGEEXPAND_STEP_SUCCESS (0x3)
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219 | /** All steps completed successfully. */
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220 | #define VHDIMAGEEXPAND_ALL_SUCCESS (0xff)
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221 | /** All steps completed (no success indicator) */
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222 | #define VHDIMAGEEXPAND_ALL_COMPLETE (0xaa)
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223 |
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224 | /** Every status field has 2 bits so we can encode 4 steps in one byte. */
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225 | #define VHDIMAGEEXPAND_STATUS_MASK 0x03
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226 | #define VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT 0x00
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227 | #define VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT 0x02
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228 | #define VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT 0x04
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229 | #define VHDIMAGEEXPAND_BAT_STATUS_SHIFT 0x06
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230 |
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231 | /**
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232 | * Helper macros to get and set the status field.
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233 | */
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234 | #define VHDIMAGEEXPAND_STATUS_GET(fFlags, cShift) \
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235 | (((fFlags) >> (cShift)) & VHDIMAGEEXPAND_STATUS_MASK)
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236 | #define VHDIMAGEEXPAND_STATUS_SET(fFlags, cShift, uVal) \
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237 | ASMAtomicOrU32(&(fFlags), ((uVal) & VHDIMAGEEXPAND_STATUS_MASK) << (cShift))
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238 |
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239 |
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240 | /*********************************************************************************************************************************
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241 | * Static Variables *
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242 | *********************************************************************************************************************************/
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243 |
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244 | /** NULL-terminated array of supported file extensions. */
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245 | static const VDFILEEXTENSION s_aVhdFileExtensions[] =
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246 | {
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247 | {"vhd", VDTYPE_HDD},
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248 | {NULL, VDTYPE_INVALID}
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249 | };
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250 |
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251 |
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252 | /*********************************************************************************************************************************
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253 | * Internal Functions *
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254 | *********************************************************************************************************************************/
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255 |
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256 |
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257 | /**
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258 | * Internal: Compute and update header checksum.
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259 | */
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260 | static uint32_t vhdChecksum(void *pHeader, uint32_t cbSize)
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261 | {
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262 | uint32_t u32ChkSum = 0;
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263 | for (uint32_t i = 0; i < cbSize; i++)
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264 | u32ChkSum += ((unsigned char *)pHeader)[i];
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265 | return ~u32ChkSum;
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266 | }
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267 |
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268 | /**
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269 | * Internal: Convert filename to UTF16 with appropriate endianness.
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270 | */
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271 | static int vhdFilenameToUtf16(const char *pszFilename, uint16_t *pu16Buf,
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272 | uint32_t cbBufSize, uint32_t *pcbActualSize,
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273 | bool fBigEndian)
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274 | {
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275 | int rc;
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276 | PRTUTF16 pTmp16 = NULL;
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277 | size_t cTmp16Len;
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278 |
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279 | rc = RTStrToUtf16(pszFilename, &pTmp16);
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280 | if (RT_SUCCESS(rc))
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281 | {
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282 | cTmp16Len = RTUtf16Len(pTmp16);
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283 | if (cTmp16Len * sizeof(*pTmp16) <= cbBufSize)
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284 | {
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285 | if (fBigEndian)
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286 | for (unsigned i = 0; i < cTmp16Len; i++)
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287 | pu16Buf[i] = RT_H2BE_U16(pTmp16[i]);
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288 | else
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289 | memcpy(pu16Buf, pTmp16, cTmp16Len * sizeof(*pTmp16));
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290 | if (pcbActualSize)
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291 | *pcbActualSize = (uint32_t)(cTmp16Len * sizeof(*pTmp16));
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292 | }
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293 | else
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294 | rc = VERR_FILENAME_TOO_LONG;
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295 | }
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296 |
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297 | if (pTmp16)
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298 | RTUtf16Free(pTmp16);
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299 | return rc;
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300 | }
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301 |
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302 | /**
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303 | * Internal: Update one locator entry.
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304 | */
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305 | static int vhdLocatorUpdate(PVHDIMAGE pImage, PVHDPLE pLocator, const char *pszFilename)
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306 | {
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307 | int rc = VINF_SUCCESS;
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308 | uint32_t cb = 0;
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309 | uint32_t cbMaxLen = RT_BE2H_U32(pLocator->u32DataSpace);
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310 | void *pvBuf = RTMemTmpAllocZ(cbMaxLen);
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311 | char *pszTmp;
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312 |
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313 | if (!pvBuf)
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314 | return VERR_NO_MEMORY;
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315 |
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316 | switch (RT_BE2H_U32(pLocator->u32Code))
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317 | {
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318 | case VHD_PLATFORM_CODE_WI2R:
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319 | {
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320 | if (RTPathStartsWithRoot(pszFilename))
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321 | {
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322 | /* Convert to relative path. */
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323 | char szPath[RTPATH_MAX];
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324 | rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename,
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325 | pszFilename);
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326 | if (RT_SUCCESS(rc))
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327 | {
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328 | /* Update plain relative name. */
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329 | cb = (uint32_t)strlen(szPath);
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330 | if (cb > cbMaxLen)
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331 | {
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332 | rc = VERR_FILENAME_TOO_LONG;
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333 | break;
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334 | }
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335 | memcpy(pvBuf, szPath, cb);
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336 | }
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337 | }
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338 | else
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339 | {
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340 | /* Update plain relative name. */
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341 | cb = (uint32_t)strlen(pszFilename);
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342 | if (cb > cbMaxLen)
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343 | {
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344 | rc = VERR_FILENAME_TOO_LONG;
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345 | break;
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346 | }
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347 | memcpy(pvBuf, pszFilename, cb);
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348 | }
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349 | if (RT_SUCCESS(rc))
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350 | pLocator->u32DataLength = RT_H2BE_U32(cb);
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351 | break;
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352 | }
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353 | case VHD_PLATFORM_CODE_WI2K:
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354 | /* Update plain absolute name. */
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355 | rc = RTPathAbs(pszFilename, (char *)pvBuf, cbMaxLen);
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356 | if (RT_SUCCESS(rc))
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357 | {
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358 | cb = (uint32_t)strlen((const char *)pvBuf);
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359 | pLocator->u32DataLength = RT_H2BE_U32(cb);
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360 | }
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361 | break;
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362 | case VHD_PLATFORM_CODE_W2RU:
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363 | if (RTPathStartsWithRoot(pszFilename))
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364 | {
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365 | /* Convert to relative path. */
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366 | char szPath[RTPATH_MAX];
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367 | rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename,
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368 | pszFilename);
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369 | if (RT_SUCCESS(rc))
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370 | rc = vhdFilenameToUtf16(szPath, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
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371 | }
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372 | else
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373 | {
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374 | /* Update unicode relative name. */
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375 | rc = vhdFilenameToUtf16(pszFilename, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
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376 | }
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377 |
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378 | if (RT_SUCCESS(rc))
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379 | pLocator->u32DataLength = RT_H2BE_U32(cb);
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380 | break;
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381 | case VHD_PLATFORM_CODE_W2KU:
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382 | /* Update unicode absolute name. */
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383 | pszTmp = (char*)RTMemTmpAllocZ(cbMaxLen);
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384 | if (!pszTmp)
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385 | {
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386 | rc = VERR_NO_MEMORY;
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387 | break;
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388 | }
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389 | rc = RTPathAbs(pszFilename, pszTmp, cbMaxLen);
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390 | if (RT_FAILURE(rc))
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391 | {
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392 | RTMemTmpFree(pszTmp);
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393 | break;
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394 | }
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395 | rc = vhdFilenameToUtf16(pszTmp, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
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396 | RTMemTmpFree(pszTmp);
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397 | if (RT_SUCCESS(rc))
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398 | pLocator->u32DataLength = RT_H2BE_U32(cb);
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399 | break;
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400 | default:
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401 | rc = VERR_NOT_IMPLEMENTED;
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402 | break;
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403 | }
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404 |
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405 | if (RT_SUCCESS(rc))
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406 | {
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407 | Assert(cb > 0);
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408 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
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409 | RT_BE2H_U64(pLocator->u64DataOffset),
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410 | pvBuf, cb);
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411 | }
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412 |
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413 | if (pvBuf)
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414 | RTMemTmpFree(pvBuf);
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415 | return rc;
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416 | }
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417 |
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418 | /**
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419 | * Internal: Update dynamic disk header from VHDIMAGE.
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420 | */
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421 | static int vhdDynamicHeaderUpdate(PVHDIMAGE pImage)
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422 | {
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423 | VHDDynamicDiskHeader ddh;
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424 | int rc, i;
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425 |
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426 | if (!pImage)
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427 | return VERR_VD_NOT_OPENED;
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428 |
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429 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
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430 | pImage->u64DataOffset, &ddh, sizeof(ddh));
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431 | if (RT_FAILURE(rc))
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432 | return rc;
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433 | if (memcmp(ddh.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE) != 0)
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434 | return VERR_VD_VHD_INVALID_HEADER;
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435 |
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436 | uint32_t u32Checksum = RT_BE2H_U32(ddh.Checksum);
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437 | ddh.Checksum = 0;
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438 | if (u32Checksum != vhdChecksum(&ddh, sizeof(ddh)))
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439 | return VERR_VD_VHD_INVALID_HEADER;
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440 |
|
---|
441 | /* Update parent's timestamp. */
|
---|
442 | ddh.ParentTimestamp = RT_H2BE_U32(pImage->u32ParentTimestamp);
|
---|
443 | /* Update parent's filename. */
|
---|
444 | if (pImage->pszParentFilename)
|
---|
445 | {
|
---|
446 | rc = vhdFilenameToUtf16(RTPathFilename(pImage->pszParentFilename),
|
---|
447 | ddh.ParentUnicodeName, sizeof(ddh.ParentUnicodeName) - 1, NULL, true);
|
---|
448 | if (RT_FAILURE(rc))
|
---|
449 | return rc;
|
---|
450 | }
|
---|
451 |
|
---|
452 | /* Update parent's locators. */
|
---|
453 | for (i = 0; i < VHD_MAX_LOCATOR_ENTRIES; i++)
|
---|
454 | {
|
---|
455 | /* Skip empty locators */
|
---|
456 | if ( ddh.ParentLocatorEntry[i].u32Code != RT_H2BE_U32(VHD_PLATFORM_CODE_NONE)
|
---|
457 | && pImage->pszParentFilename)
|
---|
458 | {
|
---|
459 | rc = vhdLocatorUpdate(pImage, &ddh.ParentLocatorEntry[i], pImage->pszParentFilename);
|
---|
460 | if (RT_FAILURE(rc))
|
---|
461 | return rc;
|
---|
462 | }
|
---|
463 | }
|
---|
464 | /* Update parent's UUID */
|
---|
465 | memcpy(ddh.ParentUuid, pImage->ParentUuid.au8, sizeof(ddh.ParentUuid));
|
---|
466 |
|
---|
467 | /* Update data offset and number of table entries. */
|
---|
468 | ddh.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
|
---|
469 |
|
---|
470 | ddh.Checksum = 0;
|
---|
471 | ddh.Checksum = RT_H2BE_U32(vhdChecksum(&ddh, sizeof(ddh)));
|
---|
472 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
473 | pImage->u64DataOffset, &ddh, sizeof(ddh));
|
---|
474 | return rc;
|
---|
475 | }
|
---|
476 |
|
---|
477 | /**
|
---|
478 | * Internal: Update the VHD footer.
|
---|
479 | */
|
---|
480 | static int vhdUpdateFooter(PVHDIMAGE pImage)
|
---|
481 | {
|
---|
482 | int rc = VINF_SUCCESS;
|
---|
483 |
|
---|
484 | /* Update fields which can change. */
|
---|
485 | pImage->vhdFooterCopy.CurSize = RT_H2BE_U64(pImage->cbSize);
|
---|
486 | pImage->vhdFooterCopy.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
|
---|
487 | pImage->vhdFooterCopy.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
|
---|
488 | pImage->vhdFooterCopy.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
|
---|
489 |
|
---|
490 | pImage->vhdFooterCopy.Checksum = 0;
|
---|
491 | pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
|
---|
492 |
|
---|
493 | if (pImage->pBlockAllocationTable)
|
---|
494 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0,
|
---|
495 | &pImage->vhdFooterCopy, sizeof(VHDFooter));
|
---|
496 |
|
---|
497 | if (RT_SUCCESS(rc))
|
---|
498 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
499 | pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy,
|
---|
500 | sizeof(VHDFooter));
|
---|
501 |
|
---|
502 | return rc;
|
---|
503 | }
|
---|
504 |
|
---|
505 | /**
|
---|
506 | * Internal. Flush image data to disk.
|
---|
507 | */
|
---|
508 | static int vhdFlushImage(PVHDIMAGE pImage)
|
---|
509 | {
|
---|
510 | int rc = VINF_SUCCESS;
|
---|
511 |
|
---|
512 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
513 | return VINF_SUCCESS;
|
---|
514 |
|
---|
515 | if (pImage->pBlockAllocationTable)
|
---|
516 | {
|
---|
517 | /*
|
---|
518 | * This is an expanding image. Write the BAT and copy of the disk footer.
|
---|
519 | */
|
---|
520 | size_t cbBlockAllocationTableToWrite = pImage->cBlockAllocationTableEntries * sizeof(uint32_t);
|
---|
521 | uint32_t *pBlockAllocationTableToWrite = (uint32_t *)RTMemAllocZ(cbBlockAllocationTableToWrite);
|
---|
522 |
|
---|
523 | if (!pBlockAllocationTableToWrite)
|
---|
524 | return VERR_NO_MEMORY;
|
---|
525 |
|
---|
526 | /*
|
---|
527 | * The BAT entries have to be stored in big endian format.
|
---|
528 | */
|
---|
529 | for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
|
---|
530 | pBlockAllocationTableToWrite[i] = RT_H2BE_U32(pImage->pBlockAllocationTable[i]);
|
---|
531 |
|
---|
532 | /*
|
---|
533 | * Write the block allocation table after the copy of the disk footer and the dynamic disk header.
|
---|
534 | */
|
---|
535 | vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
|
---|
536 | pBlockAllocationTableToWrite, cbBlockAllocationTableToWrite);
|
---|
537 | if (pImage->fDynHdrNeedsUpdate)
|
---|
538 | rc = vhdDynamicHeaderUpdate(pImage);
|
---|
539 | RTMemFree(pBlockAllocationTableToWrite);
|
---|
540 | }
|
---|
541 |
|
---|
542 | if (RT_SUCCESS(rc))
|
---|
543 | rc = vhdUpdateFooter(pImage);
|
---|
544 |
|
---|
545 | if (RT_SUCCESS(rc))
|
---|
546 | rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
|
---|
547 |
|
---|
548 | return rc;
|
---|
549 | }
|
---|
550 |
|
---|
551 | /**
|
---|
552 | * Internal. Free all allocated space for representing an image except pImage,
|
---|
553 | * and optionally delete the image from disk.
|
---|
554 | */
|
---|
555 | static int vhdFreeImage(PVHDIMAGE pImage, bool fDelete)
|
---|
556 | {
|
---|
557 | int rc = VINF_SUCCESS;
|
---|
558 |
|
---|
559 | /* Freeing a never allocated image (e.g. because the open failed) is
|
---|
560 | * not signalled as an error. After all nothing bad happens. */
|
---|
561 | if (pImage)
|
---|
562 | {
|
---|
563 | if (pImage->pStorage)
|
---|
564 | {
|
---|
565 | /* No point updating the file that is deleted anyway. */
|
---|
566 | if (!fDelete)
|
---|
567 | vhdFlushImage(pImage);
|
---|
568 |
|
---|
569 | rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
|
---|
570 | pImage->pStorage = NULL;
|
---|
571 | }
|
---|
572 |
|
---|
573 | if (pImage->pszParentFilename)
|
---|
574 | {
|
---|
575 | RTStrFree(pImage->pszParentFilename);
|
---|
576 | pImage->pszParentFilename = NULL;
|
---|
577 | }
|
---|
578 | if (pImage->pBlockAllocationTable)
|
---|
579 | {
|
---|
580 | RTMemFree(pImage->pBlockAllocationTable);
|
---|
581 | pImage->pBlockAllocationTable = NULL;
|
---|
582 | }
|
---|
583 | if (pImage->pu8Bitmap)
|
---|
584 | {
|
---|
585 | RTMemFree(pImage->pu8Bitmap);
|
---|
586 | pImage->pu8Bitmap = NULL;
|
---|
587 | }
|
---|
588 |
|
---|
589 | if (fDelete && pImage->pszFilename)
|
---|
590 | {
|
---|
591 | int rc2 = vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
|
---|
592 | if (RT_SUCCESS(rc))
|
---|
593 | rc = rc2;
|
---|
594 | }
|
---|
595 | }
|
---|
596 |
|
---|
597 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
598 | return rc;
|
---|
599 | }
|
---|
600 |
|
---|
601 | /* 946684800 is the number of seconds between 1/1/1970 and 1/1/2000 */
|
---|
602 | #define VHD_TO_UNIX_EPOCH_SECONDS UINT64_C(946684800)
|
---|
603 |
|
---|
604 | static uint32_t vhdRtTime2VhdTime(PCRTTIMESPEC pRtTimestamp)
|
---|
605 | {
|
---|
606 | uint64_t u64Seconds = RTTimeSpecGetSeconds(pRtTimestamp);
|
---|
607 | return (uint32_t)(u64Seconds - VHD_TO_UNIX_EPOCH_SECONDS);
|
---|
608 | }
|
---|
609 |
|
---|
610 | static void vhdTime2RtTime(PRTTIMESPEC pRtTimestamp, uint32_t u32VhdTimestamp)
|
---|
611 | {
|
---|
612 | RTTimeSpecSetSeconds(pRtTimestamp, VHD_TO_UNIX_EPOCH_SECONDS + u32VhdTimestamp);
|
---|
613 | }
|
---|
614 |
|
---|
615 | /**
|
---|
616 | * Internal: Allocates the block bitmap rounding up to the next 32bit or 64bit boundary.
|
---|
617 | * Can be freed with RTMemFree. The memory is zeroed.
|
---|
618 | */
|
---|
619 | DECLINLINE(uint8_t *)vhdBlockBitmapAllocate(PVHDIMAGE pImage)
|
---|
620 | {
|
---|
621 | #ifdef RT_ARCH_AMD64
|
---|
622 | return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 8);
|
---|
623 | #else
|
---|
624 | return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 4);
|
---|
625 | #endif
|
---|
626 | }
|
---|
627 |
|
---|
628 | /**
|
---|
629 | * Internal: called when the async expansion process completed (failure or success).
|
---|
630 | * Will do the necessary rollback if an error occurred.
|
---|
631 | */
|
---|
632 | static int vhdAsyncExpansionComplete(PVHDIMAGE pImage, PVDIOCTX pIoCtx, PVHDIMAGEEXPAND pExpand)
|
---|
633 | {
|
---|
634 | int rc = VINF_SUCCESS;
|
---|
635 | uint32_t fFlags = ASMAtomicReadU32(&pExpand->fFlags);
|
---|
636 | bool fIoInProgress = false;
|
---|
637 |
|
---|
638 | /* Quick path, check if everything succeeded. */
|
---|
639 | if (fFlags == VHDIMAGEEXPAND_ALL_SUCCESS)
|
---|
640 | {
|
---|
641 | pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = RT_BE2H_U32(pExpand->idxBlockBe);
|
---|
642 | RTMemFree(pExpand);
|
---|
643 | }
|
---|
644 | else
|
---|
645 | {
|
---|
646 | uint32_t uStatus;
|
---|
647 |
|
---|
648 | uStatus = VHDIMAGEEXPAND_STATUS_GET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
|
---|
649 | if ( uStatus == VHDIMAGEEXPAND_STEP_FAILED
|
---|
650 | || uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
|
---|
651 | {
|
---|
652 | /* Undo and restore the old value. */
|
---|
653 | pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = ~0U;
|
---|
654 |
|
---|
655 | /* Restore the old value on the disk.
|
---|
656 | * No need for a completion callback because we can't
|
---|
657 | * do anything if this fails. */
|
---|
658 | if (uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
|
---|
659 | {
|
---|
660 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
661 | pImage->uBlockAllocationTableOffset
|
---|
662 | + pExpand->idxBatAllocated * sizeof(uint32_t),
|
---|
663 | &pImage->pBlockAllocationTable[pExpand->idxBatAllocated],
|
---|
664 | sizeof(uint32_t), pIoCtx, NULL, NULL);
|
---|
665 | fIoInProgress |= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
|
---|
666 | }
|
---|
667 | }
|
---|
668 |
|
---|
669 | /* Restore old size (including the footer because another application might
|
---|
670 | * fill up the free space making it impossible to add the footer)
|
---|
671 | * and add the footer at the right place again. */
|
---|
672 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
|
---|
673 | pExpand->cbEofOld + sizeof(VHDFooter));
|
---|
674 | AssertRC(rc);
|
---|
675 |
|
---|
676 | pImage->uCurrentEndOfFile = pExpand->cbEofOld;
|
---|
677 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
678 | pImage->uCurrentEndOfFile,
|
---|
679 | &pImage->vhdFooterCopy, sizeof(VHDFooter),
|
---|
680 | pIoCtx, NULL, NULL);
|
---|
681 | fIoInProgress |= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
|
---|
682 | }
|
---|
683 |
|
---|
684 | return fIoInProgress ? VERR_VD_ASYNC_IO_IN_PROGRESS : rc;
|
---|
685 | }
|
---|
686 |
|
---|
687 | static int vhdAsyncExpansionStepCompleted(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq, unsigned iStep)
|
---|
688 | {
|
---|
689 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
690 | PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)pvUser;
|
---|
691 |
|
---|
692 | LogFlowFunc(("pBackendData=%#p pIoCtx=%#p pvUser=%#p rcReq=%Rrc iStep=%u\n",
|
---|
693 | pBackendData, pIoCtx, pvUser, rcReq, iStep));
|
---|
694 |
|
---|
695 | if (RT_SUCCESS(rcReq))
|
---|
696 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_SUCCESS);
|
---|
697 | else
|
---|
698 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
699 |
|
---|
700 | if ((pExpand->fFlags & VHDIMAGEEXPAND_ALL_COMPLETE) == VHDIMAGEEXPAND_ALL_COMPLETE)
|
---|
701 | return vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
|
---|
702 |
|
---|
703 | return VERR_VD_ASYNC_IO_IN_PROGRESS;
|
---|
704 | }
|
---|
705 |
|
---|
706 | static DECLCALLBACK(int) vhdAsyncExpansionDataBlockBitmapComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
|
---|
707 | {
|
---|
708 | return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT);
|
---|
709 | }
|
---|
710 |
|
---|
711 | static DECLCALLBACK(int) vhdAsyncExpansionDataComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
|
---|
712 | {
|
---|
713 | return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT);
|
---|
714 | }
|
---|
715 |
|
---|
716 | static DECLCALLBACK(int) vhdAsyncExpansionBatUpdateComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
|
---|
717 | {
|
---|
718 | return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
|
---|
719 | }
|
---|
720 |
|
---|
721 | static DECLCALLBACK(int) vhdAsyncExpansionFooterUpdateComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
|
---|
722 | {
|
---|
723 | return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT);
|
---|
724 | }
|
---|
725 |
|
---|
726 | static int vhdLoadDynamicDisk(PVHDIMAGE pImage, uint64_t uDynamicDiskHeaderOffset)
|
---|
727 | {
|
---|
728 | VHDDynamicDiskHeader vhdDynamicDiskHeader;
|
---|
729 | int rc = VINF_SUCCESS;
|
---|
730 | uint32_t *pBlockAllocationTable;
|
---|
731 | uint64_t uBlockAllocationTableOffset;
|
---|
732 | unsigned i = 0;
|
---|
733 |
|
---|
734 | Log(("Open a dynamic disk.\n"));
|
---|
735 |
|
---|
736 | /*
|
---|
737 | * Read the dynamic disk header.
|
---|
738 | */
|
---|
739 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, uDynamicDiskHeaderOffset,
|
---|
740 | &vhdDynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
|
---|
741 | if (memcmp(vhdDynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE))
|
---|
742 | return VERR_INVALID_PARAMETER;
|
---|
743 |
|
---|
744 | pImage->cbDataBlock = RT_BE2H_U32(vhdDynamicDiskHeader.BlockSize);
|
---|
745 | LogFlowFunc(("BlockSize=%u\n", pImage->cbDataBlock));
|
---|
746 | pImage->cBlockAllocationTableEntries = RT_BE2H_U32(vhdDynamicDiskHeader.MaxTableEntries);
|
---|
747 | LogFlowFunc(("MaxTableEntries=%lu\n", pImage->cBlockAllocationTableEntries));
|
---|
748 | AssertMsg(!(pImage->cbDataBlock % VHD_SECTOR_SIZE), ("%s: Data block size is not a multiple of %!\n", __FUNCTION__, VHD_SECTOR_SIZE));
|
---|
749 |
|
---|
750 | pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
|
---|
751 | LogFlowFunc(("SectorsPerDataBlock=%u\n", pImage->cSectorsPerDataBlock));
|
---|
752 |
|
---|
753 | /*
|
---|
754 | * Every block starts with a bitmap indicating which sectors are valid and which are not.
|
---|
755 | * We store the size of it to be able to calculate the real offset.
|
---|
756 | */
|
---|
757 | pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
|
---|
758 | pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
|
---|
759 | /* Round up to full sector size */
|
---|
760 | if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
|
---|
761 | pImage->cDataBlockBitmapSectors++;
|
---|
762 | LogFlowFunc(("cbDataBlockBitmap=%u\n", pImage->cbDataBlockBitmap));
|
---|
763 | LogFlowFunc(("cDataBlockBitmapSectors=%u\n", pImage->cDataBlockBitmapSectors));
|
---|
764 |
|
---|
765 | pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
|
---|
766 | if (!pImage->pu8Bitmap)
|
---|
767 | return VERR_NO_MEMORY;
|
---|
768 |
|
---|
769 | pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
|
---|
770 | if (!pBlockAllocationTable)
|
---|
771 | return VERR_NO_MEMORY;
|
---|
772 |
|
---|
773 | /*
|
---|
774 | * Read the table.
|
---|
775 | */
|
---|
776 | uBlockAllocationTableOffset = RT_BE2H_U64(vhdDynamicDiskHeader.TableOffset);
|
---|
777 | LogFlowFunc(("uBlockAllocationTableOffset=%llu\n", uBlockAllocationTableOffset));
|
---|
778 | pImage->uBlockAllocationTableOffset = uBlockAllocationTableOffset;
|
---|
779 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
780 | uBlockAllocationTableOffset, pBlockAllocationTable,
|
---|
781 | pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
|
---|
782 |
|
---|
783 | /*
|
---|
784 | * Because the offset entries inside the allocation table are stored big endian
|
---|
785 | * we need to convert them into host endian.
|
---|
786 | */
|
---|
787 | pImage->pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
|
---|
788 | if (!pImage->pBlockAllocationTable)
|
---|
789 | {
|
---|
790 | RTMemFree(pBlockAllocationTable);
|
---|
791 | return VERR_NO_MEMORY;
|
---|
792 | }
|
---|
793 |
|
---|
794 | for (i = 0; i < pImage->cBlockAllocationTableEntries; i++)
|
---|
795 | pImage->pBlockAllocationTable[i] = RT_BE2H_U32(pBlockAllocationTable[i]);
|
---|
796 |
|
---|
797 | RTMemFree(pBlockAllocationTable);
|
---|
798 |
|
---|
799 | if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF)
|
---|
800 | memcpy(pImage->ParentUuid.au8, vhdDynamicDiskHeader.ParentUuid, sizeof(pImage->ParentUuid));
|
---|
801 |
|
---|
802 | return rc;
|
---|
803 | }
|
---|
804 |
|
---|
805 | static int vhdOpenImage(PVHDIMAGE pImage, unsigned uOpenFlags)
|
---|
806 | {
|
---|
807 | uint64_t FileSize;
|
---|
808 | VHDFooter vhdFooter;
|
---|
809 |
|
---|
810 | pImage->uOpenFlags = uOpenFlags;
|
---|
811 |
|
---|
812 | pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
|
---|
813 | pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
|
---|
814 | AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
|
---|
815 |
|
---|
816 | /*
|
---|
817 | * Open the image.
|
---|
818 | */
|
---|
819 | int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
|
---|
820 | VDOpenFlagsToFileOpenFlags(uOpenFlags,
|
---|
821 | false /* fCreate */),
|
---|
822 | &pImage->pStorage);
|
---|
823 | if (RT_FAILURE(rc))
|
---|
824 | {
|
---|
825 | /* Do NOT signal an appropriate error here, as the VD layer has the
|
---|
826 | * choice of retrying the open if it failed. */
|
---|
827 | return rc;
|
---|
828 | }
|
---|
829 |
|
---|
830 | rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &FileSize);
|
---|
831 | pImage->uCurrentEndOfFile = FileSize - sizeof(VHDFooter);
|
---|
832 |
|
---|
833 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
|
---|
834 | &vhdFooter, sizeof(VHDFooter));
|
---|
835 | if (RT_SUCCESS(rc))
|
---|
836 | {
|
---|
837 | if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
|
---|
838 | {
|
---|
839 | /*
|
---|
840 | * There is also a backup header at the beginning in case the image got corrupted.
|
---|
841 | * Such corrupted images are detected here to let the open handler repair it later.
|
---|
842 | */
|
---|
843 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0,
|
---|
844 | &vhdFooter, sizeof(VHDFooter));
|
---|
845 | if (RT_SUCCESS(rc))
|
---|
846 | {
|
---|
847 | if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
|
---|
848 | rc = VERR_VD_VHD_INVALID_HEADER;
|
---|
849 | else
|
---|
850 | rc = VERR_VD_IMAGE_CORRUPTED;
|
---|
851 | }
|
---|
852 | }
|
---|
853 | }
|
---|
854 |
|
---|
855 | if (RT_FAILURE(rc))
|
---|
856 | return rc;
|
---|
857 |
|
---|
858 | switch (RT_BE2H_U32(vhdFooter.DiskType))
|
---|
859 | {
|
---|
860 | case VHD_FOOTER_DISK_TYPE_FIXED:
|
---|
861 | pImage->uImageFlags |= VD_IMAGE_FLAGS_FIXED;
|
---|
862 | break;
|
---|
863 | case VHD_FOOTER_DISK_TYPE_DYNAMIC:
|
---|
864 | pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
|
---|
865 | break;
|
---|
866 | case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
|
---|
867 | pImage->uImageFlags |= VD_IMAGE_FLAGS_DIFF;
|
---|
868 | pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
|
---|
869 | break;
|
---|
870 | default:
|
---|
871 | return VERR_NOT_IMPLEMENTED;
|
---|
872 | }
|
---|
873 |
|
---|
874 | pImage->cbSize = RT_BE2H_U64(vhdFooter.CurSize);
|
---|
875 | pImage->LCHSGeometry.cCylinders = 0;
|
---|
876 | pImage->LCHSGeometry.cHeads = 0;
|
---|
877 | pImage->LCHSGeometry.cSectors = 0;
|
---|
878 | pImage->PCHSGeometry.cCylinders = RT_BE2H_U16(vhdFooter.DiskGeometryCylinder);
|
---|
879 | pImage->PCHSGeometry.cHeads = vhdFooter.DiskGeometryHeads;
|
---|
880 | pImage->PCHSGeometry.cSectors = vhdFooter.DiskGeometrySectors;
|
---|
881 |
|
---|
882 | /*
|
---|
883 | * Copy of the disk footer.
|
---|
884 | * If we allocate new blocks in differencing disks on write access
|
---|
885 | * the footer is overwritten. We need to write it at the end of the file.
|
---|
886 | */
|
---|
887 | memcpy(&pImage->vhdFooterCopy, &vhdFooter, sizeof(VHDFooter));
|
---|
888 |
|
---|
889 | /*
|
---|
890 | * Is there a better way?
|
---|
891 | */
|
---|
892 | memcpy(&pImage->ImageUuid, &vhdFooter.UniqueID, 16);
|
---|
893 |
|
---|
894 | pImage->u64DataOffset = RT_BE2H_U64(vhdFooter.DataOffset);
|
---|
895 | LogFlowFunc(("DataOffset=%llu\n", pImage->u64DataOffset));
|
---|
896 |
|
---|
897 | if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
|
---|
898 | rc = vhdLoadDynamicDisk(pImage, pImage->u64DataOffset);
|
---|
899 |
|
---|
900 | if (RT_SUCCESS(rc))
|
---|
901 | {
|
---|
902 | PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
|
---|
903 | pImage->RegionList.fFlags = 0;
|
---|
904 | pImage->RegionList.cRegions = 1;
|
---|
905 |
|
---|
906 | pRegion->offRegion = 0; /* Disk start. */
|
---|
907 | pRegion->cbBlock = 512;
|
---|
908 | pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
|
---|
909 | pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
|
---|
910 | pRegion->cbData = 512;
|
---|
911 | pRegion->cbMetadata = 0;
|
---|
912 | pRegion->cRegionBlocksOrBytes = pImage->cbSize;
|
---|
913 | }
|
---|
914 | else
|
---|
915 | vhdFreeImage(pImage, false);
|
---|
916 | return rc;
|
---|
917 | }
|
---|
918 |
|
---|
919 | /**
|
---|
920 | * Internal: Checks if a sector in the block bitmap is set
|
---|
921 | */
|
---|
922 | DECLINLINE(bool) vhdBlockBitmapSectorContainsData(PVHDIMAGE pImage, uint32_t cBlockBitmapEntry)
|
---|
923 | {
|
---|
924 | uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
|
---|
925 |
|
---|
926 | /*
|
---|
927 | * The index of the bit in the byte of the data block bitmap.
|
---|
928 | * The most significant bit stands for a lower sector number.
|
---|
929 | */
|
---|
930 | uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
|
---|
931 | uint8_t *puBitmap = pImage->pu8Bitmap + iBitmap;
|
---|
932 |
|
---|
933 | AssertMsg(puBitmap < (pImage->pu8Bitmap + pImage->cbDataBlockBitmap),
|
---|
934 | ("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
|
---|
935 |
|
---|
936 | return ((*puBitmap) & RT_BIT(iBitInByte)) != 0;
|
---|
937 | }
|
---|
938 |
|
---|
939 | /**
|
---|
940 | * Internal: Sets the given sector in the sector bitmap.
|
---|
941 | */
|
---|
942 | DECLINLINE(bool) vhdBlockBitmapSectorSet(PVHDIMAGE pImage, uint8_t *pu8Bitmap, uint32_t cBlockBitmapEntry)
|
---|
943 | {
|
---|
944 | RT_NOREF1(pImage);
|
---|
945 | uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
|
---|
946 |
|
---|
947 | /*
|
---|
948 | * The index of the bit in the byte of the data block bitmap.
|
---|
949 | * The most significant bit stands for a lower sector number.
|
---|
950 | */
|
---|
951 | uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
|
---|
952 | uint8_t *puBitmap = pu8Bitmap + iBitmap;
|
---|
953 |
|
---|
954 | AssertMsg(puBitmap < (pu8Bitmap + pImage->cbDataBlockBitmap),
|
---|
955 | ("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
|
---|
956 |
|
---|
957 | bool fClear = ((*puBitmap) & RT_BIT(iBitInByte)) == 0;
|
---|
958 | *puBitmap |= RT_BIT(iBitInByte);
|
---|
959 | return fClear;
|
---|
960 | }
|
---|
961 |
|
---|
962 | /**
|
---|
963 | * Internal: Derive drive geometry from its size.
|
---|
964 | */
|
---|
965 | static void vhdSetDiskGeometry(PVHDIMAGE pImage, uint64_t cbSize)
|
---|
966 | {
|
---|
967 | uint64_t u64TotalSectors = cbSize / VHD_SECTOR_SIZE;
|
---|
968 | uint32_t u32CylinderTimesHeads, u32Heads, u32SectorsPerTrack;
|
---|
969 |
|
---|
970 | if (u64TotalSectors > 65535 * 16 * 255)
|
---|
971 | {
|
---|
972 | /* ATA disks limited to 127 GB. */
|
---|
973 | u64TotalSectors = 65535 * 16 * 255;
|
---|
974 | }
|
---|
975 |
|
---|
976 | if (u64TotalSectors >= 65535 * 16 * 63)
|
---|
977 | {
|
---|
978 | u32SectorsPerTrack = 255;
|
---|
979 | u32Heads = 16;
|
---|
980 | u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
|
---|
981 | }
|
---|
982 | else
|
---|
983 | {
|
---|
984 | u32SectorsPerTrack = 17;
|
---|
985 | u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
|
---|
986 |
|
---|
987 | u32Heads = (u32CylinderTimesHeads + 1023) / 1024;
|
---|
988 |
|
---|
989 | if (u32Heads < 4)
|
---|
990 | {
|
---|
991 | u32Heads = 4;
|
---|
992 | }
|
---|
993 | if (u32CylinderTimesHeads >= (u32Heads * 1024) || u32Heads > 16)
|
---|
994 | {
|
---|
995 | u32SectorsPerTrack = 31;
|
---|
996 | u32Heads = 16;
|
---|
997 | u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
|
---|
998 | }
|
---|
999 | if (u32CylinderTimesHeads >= (u32Heads * 1024))
|
---|
1000 | {
|
---|
1001 | u32SectorsPerTrack = 63;
|
---|
1002 | u32Heads = 16;
|
---|
1003 | u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
|
---|
1004 | }
|
---|
1005 | }
|
---|
1006 | pImage->PCHSGeometry.cCylinders = u32CylinderTimesHeads / u32Heads;
|
---|
1007 | pImage->PCHSGeometry.cHeads = u32Heads;
|
---|
1008 | pImage->PCHSGeometry.cSectors = u32SectorsPerTrack;
|
---|
1009 | pImage->LCHSGeometry.cCylinders = 0;
|
---|
1010 | pImage->LCHSGeometry.cHeads = 0;
|
---|
1011 | pImage->LCHSGeometry.cSectors = 0;
|
---|
1012 | }
|
---|
1013 |
|
---|
1014 |
|
---|
1015 | static uint32_t vhdAllocateParentLocators(PVHDIMAGE pImage, VHDDynamicDiskHeader *pDDH, uint64_t u64Offset)
|
---|
1016 | {
|
---|
1017 | RT_NOREF1(pImage);
|
---|
1018 | PVHDPLE pLocator = pDDH->ParentLocatorEntry;
|
---|
1019 |
|
---|
1020 | /*
|
---|
1021 | * The VHD spec states that the DataSpace field holds the number of sectors
|
---|
1022 | * required to store the parent locator path.
|
---|
1023 | * As it turned out VPC and Hyper-V store the amount of bytes reserved for the
|
---|
1024 | * path and not the number of sectors.
|
---|
1025 | */
|
---|
1026 |
|
---|
1027 | /* Unicode absolute Windows path. */
|
---|
1028 | pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2KU);
|
---|
1029 | pLocator->u32DataSpace = RT_H2BE_U32(VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16));
|
---|
1030 | pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
|
---|
1031 | pLocator++;
|
---|
1032 | u64Offset += VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16);
|
---|
1033 | /* Unicode relative Windows path. */
|
---|
1034 | pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2RU);
|
---|
1035 | pLocator->u32DataSpace = RT_H2BE_U32(VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16));
|
---|
1036 | pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
|
---|
1037 | u64Offset += VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16);
|
---|
1038 | return u64Offset;
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | /**
|
---|
1042 | * Internal: Additional code for dynamic VHD image creation.
|
---|
1043 | */
|
---|
1044 | static int vhdCreateDynamicImage(PVHDIMAGE pImage, uint64_t cbSize)
|
---|
1045 | {
|
---|
1046 | int rc;
|
---|
1047 | VHDDynamicDiskHeader DynamicDiskHeader;
|
---|
1048 | uint32_t u32BlockAllocationTableSectors;
|
---|
1049 | void *pvTmp = NULL;
|
---|
1050 |
|
---|
1051 | memset(&DynamicDiskHeader, 0, sizeof(DynamicDiskHeader));
|
---|
1052 |
|
---|
1053 | pImage->u64DataOffset = sizeof(VHDFooter);
|
---|
1054 | pImage->cbDataBlock = VHD_BLOCK_SIZE; /* 2 MB */
|
---|
1055 | pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
|
---|
1056 | pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
|
---|
1057 | pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
|
---|
1058 | /* Align to sector boundary */
|
---|
1059 | if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
|
---|
1060 | pImage->cDataBlockBitmapSectors++;
|
---|
1061 | pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
|
---|
1062 | if (!pImage->pu8Bitmap)
|
---|
1063 | return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for bitmap storage"));
|
---|
1064 |
|
---|
1065 | /* Initialize BAT. */
|
---|
1066 | pImage->uBlockAllocationTableOffset = (uint64_t)sizeof(VHDFooter) + sizeof(VHDDynamicDiskHeader);
|
---|
1067 | pImage->cBlockAllocationTableEntries = (uint32_t)((cbSize + pImage->cbDataBlock - 1) / pImage->cbDataBlock); /* Align table to the block size. */
|
---|
1068 | u32BlockAllocationTableSectors = (pImage->cBlockAllocationTableEntries * sizeof(uint32_t) + VHD_SECTOR_SIZE - 1) / VHD_SECTOR_SIZE;
|
---|
1069 | pImage->pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
|
---|
1070 | if (!pImage->pBlockAllocationTable)
|
---|
1071 | return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for BAT"));
|
---|
1072 |
|
---|
1073 | for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
|
---|
1074 | {
|
---|
1075 | pImage->pBlockAllocationTable[i] = 0xFFFFFFFF; /* It is actually big endian. */
|
---|
1076 | }
|
---|
1077 |
|
---|
1078 | /* Round up to the sector size. */
|
---|
1079 | if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF) /* fix hyper-v unreadable error */
|
---|
1080 | pImage->uCurrentEndOfFile = vhdAllocateParentLocators(pImage, &DynamicDiskHeader,
|
---|
1081 | pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE);
|
---|
1082 | else
|
---|
1083 | pImage->uCurrentEndOfFile = pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE;
|
---|
1084 |
|
---|
1085 | /* Set dynamic image size. */
|
---|
1086 | pvTmp = RTMemTmpAllocZ(pImage->uCurrentEndOfFile + sizeof(VHDFooter));
|
---|
1087 | if (!pvTmp)
|
---|
1088 | return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
|
---|
1089 |
|
---|
1090 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, pvTmp,
|
---|
1091 | pImage->uCurrentEndOfFile + sizeof(VHDFooter));
|
---|
1092 | if (RT_FAILURE(rc))
|
---|
1093 | {
|
---|
1094 | RTMemTmpFree(pvTmp);
|
---|
1095 | return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
|
---|
1096 | }
|
---|
1097 |
|
---|
1098 | RTMemTmpFree(pvTmp);
|
---|
1099 |
|
---|
1100 | /* Initialize and write the dynamic disk header. */
|
---|
1101 | memcpy(DynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, sizeof(DynamicDiskHeader.Cookie));
|
---|
1102 | DynamicDiskHeader.DataOffset = UINT64_C(0xFFFFFFFFFFFFFFFF); /* Initially the disk has no data. */
|
---|
1103 | DynamicDiskHeader.TableOffset = RT_H2BE_U64(pImage->uBlockAllocationTableOffset);
|
---|
1104 | DynamicDiskHeader.HeaderVersion = RT_H2BE_U32(VHD_DYNAMIC_DISK_HEADER_VERSION);
|
---|
1105 | DynamicDiskHeader.BlockSize = RT_H2BE_U32(pImage->cbDataBlock);
|
---|
1106 | DynamicDiskHeader.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
|
---|
1107 | /* Compute and update checksum. */
|
---|
1108 | DynamicDiskHeader.Checksum = 0;
|
---|
1109 | DynamicDiskHeader.Checksum = RT_H2BE_U32(vhdChecksum(&DynamicDiskHeader, sizeof(DynamicDiskHeader)));
|
---|
1110 |
|
---|
1111 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VHDFooter),
|
---|
1112 | &DynamicDiskHeader, sizeof(DynamicDiskHeader));
|
---|
1113 | if (RT_FAILURE(rc))
|
---|
1114 | return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write dynamic disk header to image '%s'"), pImage->pszFilename);
|
---|
1115 |
|
---|
1116 | /* Write BAT. */
|
---|
1117 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
|
---|
1118 | pImage->pBlockAllocationTable,
|
---|
1119 | pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
|
---|
1120 | if (RT_FAILURE(rc))
|
---|
1121 | return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write BAT to image '%s'"), pImage->pszFilename);
|
---|
1122 |
|
---|
1123 | return rc;
|
---|
1124 | }
|
---|
1125 |
|
---|
1126 | /**
|
---|
1127 | * Internal: The actual code for VHD image creation, both fixed and dynamic.
|
---|
1128 | */
|
---|
1129 | static int vhdCreateImage(PVHDIMAGE pImage, uint64_t cbSize,
|
---|
1130 | unsigned uImageFlags, const char *pszComment,
|
---|
1131 | PCVDGEOMETRY pPCHSGeometry,
|
---|
1132 | PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
|
---|
1133 | unsigned uOpenFlags,
|
---|
1134 | PVDINTERFACEPROGRESS pIfProgress,
|
---|
1135 | unsigned uPercentStart, unsigned uPercentSpan)
|
---|
1136 | {
|
---|
1137 | RT_NOREF3(pszComment, pPCHSGeometry, pLCHSGeometry);
|
---|
1138 | VHDFooter Footer;
|
---|
1139 | RTTIMESPEC now;
|
---|
1140 |
|
---|
1141 | pImage->uOpenFlags = uOpenFlags;
|
---|
1142 | pImage->uImageFlags = uImageFlags;
|
---|
1143 | pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
|
---|
1144 |
|
---|
1145 | int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
|
---|
1146 | VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
|
---|
1147 | true /* fCreate */),
|
---|
1148 | &pImage->pStorage);
|
---|
1149 | if (RT_SUCCESS(rc))
|
---|
1150 | {
|
---|
1151 | pImage->cbSize = cbSize;
|
---|
1152 | pImage->ImageUuid = *pUuid;
|
---|
1153 | RTUuidClear(&pImage->ParentUuid);
|
---|
1154 | vhdSetDiskGeometry(pImage, cbSize);
|
---|
1155 |
|
---|
1156 | /* Initialize the footer. */
|
---|
1157 | memset(&Footer, 0, sizeof(Footer));
|
---|
1158 | memcpy(Footer.Cookie, VHD_FOOTER_COOKIE, sizeof(Footer.Cookie));
|
---|
1159 | Footer.Features = RT_H2BE_U32(0x2);
|
---|
1160 | Footer.Version = RT_H2BE_U32(VHD_FOOTER_FILE_FORMAT_VERSION);
|
---|
1161 | Footer.Timestamp = RT_H2BE_U32(vhdRtTime2VhdTime(RTTimeNow(&now)));
|
---|
1162 | memcpy(Footer.CreatorApp, "vbox", sizeof(Footer.CreatorApp));
|
---|
1163 | Footer.CreatorVer = RT_H2BE_U32(VBOX_VERSION);
|
---|
1164 | #ifdef RT_OS_DARWIN
|
---|
1165 | Footer.CreatorOS = RT_H2BE_U32(0x4D616320); /* "Mac " */
|
---|
1166 | #else /* Virtual PC supports only two platforms atm, so everything else will be Wi2k. */
|
---|
1167 | Footer.CreatorOS = RT_H2BE_U32(0x5769326B); /* "Wi2k" */
|
---|
1168 | #endif
|
---|
1169 | Footer.OrigSize = RT_H2BE_U64(cbSize);
|
---|
1170 | Footer.CurSize = Footer.OrigSize;
|
---|
1171 | Footer.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
|
---|
1172 | Footer.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
|
---|
1173 | Footer.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
|
---|
1174 | memcpy(Footer.UniqueID, pImage->ImageUuid.au8, sizeof(Footer.UniqueID));
|
---|
1175 | Footer.SavedState = 0;
|
---|
1176 |
|
---|
1177 | if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
|
---|
1178 | {
|
---|
1179 | Footer.DiskType = RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_FIXED);
|
---|
1180 | /*
|
---|
1181 | * Initialize fixed image.
|
---|
1182 | * "The size of the entire file is the size of the hard disk in
|
---|
1183 | * the guest operating system plus the size of the footer."
|
---|
1184 | */
|
---|
1185 | pImage->u64DataOffset = VHD_FOOTER_DATA_OFFSET_FIXED;
|
---|
1186 | pImage->uCurrentEndOfFile = cbSize;
|
---|
1187 | rc = vdIfIoIntFileSetAllocationSize(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile + sizeof(VHDFooter),
|
---|
1188 | 0 /* fFlags */, pIfProgress,
|
---|
1189 | uPercentStart, uPercentSpan);
|
---|
1190 | if (RT_FAILURE(rc))
|
---|
1191 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
|
---|
1192 | }
|
---|
1193 | else
|
---|
1194 | {
|
---|
1195 | /*
|
---|
1196 | * Initialize dynamic image.
|
---|
1197 | *
|
---|
1198 | * The overall structure of dynamic disk is:
|
---|
1199 | *
|
---|
1200 | * [Copy of hard disk footer (512 bytes)]
|
---|
1201 | * [Dynamic disk header (1024 bytes)]
|
---|
1202 | * [BAT (Block Allocation Table)]
|
---|
1203 | * [Parent Locators]
|
---|
1204 | * [Data block 1]
|
---|
1205 | * [Data block 2]
|
---|
1206 | * ...
|
---|
1207 | * [Data block N]
|
---|
1208 | * [Hard disk footer (512 bytes)]
|
---|
1209 | */
|
---|
1210 | Footer.DiskType = (uImageFlags & VD_IMAGE_FLAGS_DIFF)
|
---|
1211 | ? RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DIFFERENCING)
|
---|
1212 | : RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DYNAMIC);
|
---|
1213 | /* We are half way thorough with creation of image, let the caller know. */
|
---|
1214 | vdIfProgress(pIfProgress, (uPercentStart + uPercentSpan) / 2);
|
---|
1215 |
|
---|
1216 | rc = vhdCreateDynamicImage(pImage, cbSize);
|
---|
1217 | }
|
---|
1218 |
|
---|
1219 | if (RT_SUCCESS(rc))
|
---|
1220 | {
|
---|
1221 | /* Compute and update the footer checksum. */
|
---|
1222 | Footer.DataOffset = RT_H2BE_U64(pImage->u64DataOffset);
|
---|
1223 | Footer.Checksum = 0;
|
---|
1224 | Footer.Checksum = RT_H2BE_U32(vhdChecksum(&Footer, sizeof(Footer)));
|
---|
1225 |
|
---|
1226 | pImage->vhdFooterCopy = Footer;
|
---|
1227 |
|
---|
1228 | /* Store the footer */
|
---|
1229 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
|
---|
1230 | &Footer, sizeof(Footer));
|
---|
1231 | if (RT_SUCCESS(rc))
|
---|
1232 | {
|
---|
1233 | /* Dynamic images contain a copy of the footer at the very beginning of the file. */
|
---|
1234 | if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
|
---|
1235 | {
|
---|
1236 | /* Write the copy of the footer. */
|
---|
1237 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Footer, sizeof(Footer));
|
---|
1238 | if (RT_FAILURE(rc))
|
---|
1239 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write a copy of footer to image '%s'"), pImage->pszFilename);
|
---|
1240 | }
|
---|
1241 | }
|
---|
1242 | else
|
---|
1243 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write footer to image '%s'"), pImage->pszFilename);
|
---|
1244 | }
|
---|
1245 | }
|
---|
1246 | else
|
---|
1247 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot create image '%s'"), pImage->pszFilename);
|
---|
1248 |
|
---|
1249 | if (RT_SUCCESS(rc))
|
---|
1250 | vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
|
---|
1251 |
|
---|
1252 | if (RT_SUCCESS(rc))
|
---|
1253 | {
|
---|
1254 | PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
|
---|
1255 | pImage->RegionList.fFlags = 0;
|
---|
1256 | pImage->RegionList.cRegions = 1;
|
---|
1257 |
|
---|
1258 | pRegion->offRegion = 0; /* Disk start. */
|
---|
1259 | pRegion->cbBlock = 512;
|
---|
1260 | pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
|
---|
1261 | pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
|
---|
1262 | pRegion->cbData = 512;
|
---|
1263 | pRegion->cbMetadata = 0;
|
---|
1264 | pRegion->cRegionBlocksOrBytes = pImage->cbSize;
|
---|
1265 | }
|
---|
1266 | else
|
---|
1267 | vhdFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
|
---|
1268 | return rc;
|
---|
1269 | }
|
---|
1270 |
|
---|
1271 |
|
---|
1272 | /** @interface_method_impl{VDIMAGEBACKEND,pfnProbe} */
|
---|
1273 | static DECLCALLBACK(int) vhdProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
|
---|
1274 | PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
|
---|
1275 | {
|
---|
1276 | RT_NOREF1(pVDIfsDisk);
|
---|
1277 | LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
|
---|
1278 | PVDIOSTORAGE pStorage;
|
---|
1279 | PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
|
---|
1280 | AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
|
---|
1281 |
|
---|
1282 | int rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
|
---|
1283 | VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
|
---|
1284 | false /* fCreate */),
|
---|
1285 | &pStorage);
|
---|
1286 | if (RT_SUCCESS(rc))
|
---|
1287 | {
|
---|
1288 | uint64_t cbFile;
|
---|
1289 |
|
---|
1290 | rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
|
---|
1291 | if ( RT_SUCCESS(rc)
|
---|
1292 | && cbFile >= sizeof(VHDFooter))
|
---|
1293 | {
|
---|
1294 | VHDFooter vhdFooter;
|
---|
1295 |
|
---|
1296 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
|
---|
1297 | &vhdFooter, sizeof(VHDFooter));
|
---|
1298 | if (RT_SUCCESS(rc))
|
---|
1299 | {
|
---|
1300 | if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
|
---|
1301 | {
|
---|
1302 | /*
|
---|
1303 | * There is also a backup header at the beginning in case the image got corrupted.
|
---|
1304 | * Such corrupted images are detected here to let the open handler repair it later.
|
---|
1305 | */
|
---|
1306 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter));
|
---|
1307 | if ( RT_FAILURE(rc)
|
---|
1308 | || (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0))
|
---|
1309 | rc = VERR_VD_VHD_INVALID_HEADER;
|
---|
1310 | }
|
---|
1311 |
|
---|
1312 | if (RT_SUCCESS(rc))
|
---|
1313 | *penmType = VDTYPE_HDD;
|
---|
1314 | }
|
---|
1315 | else
|
---|
1316 | rc = VERR_VD_VHD_INVALID_HEADER;
|
---|
1317 | }
|
---|
1318 | else if (RT_SUCCESS(rc))
|
---|
1319 | rc = VERR_VD_VHD_INVALID_HEADER;
|
---|
1320 |
|
---|
1321 | vdIfIoIntFileClose(pIfIo, pStorage);
|
---|
1322 | }
|
---|
1323 |
|
---|
1324 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1325 | return rc;
|
---|
1326 | }
|
---|
1327 |
|
---|
1328 | /** @interface_method_impl{VDIMAGEBACKEND,pfnOpen} */
|
---|
1329 | static DECLCALLBACK(int) vhdOpen(const char *pszFilename, unsigned uOpenFlags,
|
---|
1330 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
---|
1331 | VDTYPE enmType, void **ppBackendData)
|
---|
1332 | {
|
---|
1333 | RT_NOREF1(enmType); /**< @todo r=klaus make use of the type info. */
|
---|
1334 |
|
---|
1335 | LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
|
---|
1336 | pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
|
---|
1337 | int rc = VINF_SUCCESS;
|
---|
1338 |
|
---|
1339 | /* Check open flags. All valid flags are supported. */
|
---|
1340 | AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
|
---|
1341 | AssertReturn((VALID_PTR(pszFilename) && *pszFilename), VERR_INVALID_PARAMETER);
|
---|
1342 |
|
---|
1343 | PVHDIMAGE pImage = (PVHDIMAGE)RTMemAllocZ(RT_UOFFSETOF(VHDIMAGE, RegionList.aRegions[1]));
|
---|
1344 | if (RT_LIKELY(pImage))
|
---|
1345 | {
|
---|
1346 | pImage->pszFilename = pszFilename;
|
---|
1347 | pImage->pStorage = NULL;
|
---|
1348 | pImage->pVDIfsDisk = pVDIfsDisk;
|
---|
1349 | pImage->pVDIfsImage = pVDIfsImage;
|
---|
1350 |
|
---|
1351 | rc = vhdOpenImage(pImage, uOpenFlags);
|
---|
1352 | if (RT_SUCCESS(rc))
|
---|
1353 | *ppBackendData = pImage;
|
---|
1354 | else
|
---|
1355 | RTMemFree(pImage);
|
---|
1356 | }
|
---|
1357 | else
|
---|
1358 | rc = VERR_NO_MEMORY;
|
---|
1359 |
|
---|
1360 | LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
|
---|
1361 | return rc;
|
---|
1362 | }
|
---|
1363 |
|
---|
1364 | /** @interface_method_impl{VDIMAGEBACKEND,pfnCreate} */
|
---|
1365 | static DECLCALLBACK(int) vhdCreate(const char *pszFilename, uint64_t cbSize,
|
---|
1366 | unsigned uImageFlags, const char *pszComment,
|
---|
1367 | PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
|
---|
1368 | PCRTUUID pUuid, unsigned uOpenFlags,
|
---|
1369 | unsigned uPercentStart, unsigned uPercentSpan,
|
---|
1370 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
---|
1371 | PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
|
---|
1372 | void **ppBackendData)
|
---|
1373 | {
|
---|
1374 | LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p enmType=%u ppBackendData=%#p",
|
---|
1375 | pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
|
---|
1376 | int rc;
|
---|
1377 | PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
|
---|
1378 |
|
---|
1379 | /* Check the VD container type. */
|
---|
1380 | if (enmType != VDTYPE_HDD)
|
---|
1381 | return VERR_VD_INVALID_TYPE;
|
---|
1382 |
|
---|
1383 | /* Check open flags. All valid flags are supported. */
|
---|
1384 | AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
|
---|
1385 | AssertReturn( VALID_PTR(pszFilename)
|
---|
1386 | && *pszFilename
|
---|
1387 | && VALID_PTR(pPCHSGeometry)
|
---|
1388 | && VALID_PTR(pLCHSGeometry), VERR_INVALID_PARAMETER);
|
---|
1389 | /** @todo Check the values of other params */
|
---|
1390 |
|
---|
1391 | PVHDIMAGE pImage = (PVHDIMAGE)RTMemAllocZ(RT_UOFFSETOF(VHDIMAGE, RegionList.aRegions[1]));
|
---|
1392 | if (RT_LIKELY(pImage))
|
---|
1393 | {
|
---|
1394 | pImage->pszFilename = pszFilename;
|
---|
1395 | pImage->pStorage = NULL;
|
---|
1396 | pImage->pVDIfsDisk = pVDIfsDisk;
|
---|
1397 | pImage->pVDIfsImage = pVDIfsImage;
|
---|
1398 |
|
---|
1399 | /* Get I/O interface. */
|
---|
1400 | pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
|
---|
1401 | if (RT_LIKELY(VALID_PTR(pImage->pIfIo)))
|
---|
1402 | {
|
---|
1403 | rc = vhdCreateImage(pImage, cbSize, uImageFlags, pszComment,
|
---|
1404 | pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
|
---|
1405 | pIfProgress, uPercentStart, uPercentSpan);
|
---|
1406 | if (RT_SUCCESS(rc))
|
---|
1407 | {
|
---|
1408 | /* So far the image is opened in read/write mode. Make sure the
|
---|
1409 | * image is opened in read-only mode if the caller requested that. */
|
---|
1410 | if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
1411 | {
|
---|
1412 | vhdFreeImage(pImage, false);
|
---|
1413 | rc = vhdOpenImage(pImage, uOpenFlags);
|
---|
1414 | }
|
---|
1415 |
|
---|
1416 | if (RT_SUCCESS(rc))
|
---|
1417 | *ppBackendData = pImage;
|
---|
1418 | }
|
---|
1419 | }
|
---|
1420 | else
|
---|
1421 | rc = VERR_INVALID_PARAMETER;
|
---|
1422 |
|
---|
1423 | if (RT_FAILURE(rc))
|
---|
1424 | RTMemFree(pImage);
|
---|
1425 | }
|
---|
1426 | else
|
---|
1427 | rc = VERR_NO_MEMORY;
|
---|
1428 |
|
---|
1429 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1430 | return rc;
|
---|
1431 | }
|
---|
1432 |
|
---|
1433 | /** @interface_method_impl{VDIMAGEBACKEND,pfnRename} */
|
---|
1434 | static DECLCALLBACK(int) vhdRename(void *pBackendData, const char *pszFilename)
|
---|
1435 | {
|
---|
1436 | LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
|
---|
1437 | int rc = VINF_SUCCESS;
|
---|
1438 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1439 |
|
---|
1440 | /* Check arguments. */
|
---|
1441 | AssertReturn((pImage && pszFilename && *pszFilename), VERR_INVALID_PARAMETER);
|
---|
1442 |
|
---|
1443 | /* Close the image. */
|
---|
1444 | rc = vhdFreeImage(pImage, false);
|
---|
1445 | if (RT_SUCCESS(rc))
|
---|
1446 | {
|
---|
1447 | /* Rename the file. */
|
---|
1448 | rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
|
---|
1449 | if (RT_SUCCESS(rc))
|
---|
1450 | {
|
---|
1451 | /* Update pImage with the new information. */
|
---|
1452 | pImage->pszFilename = pszFilename;
|
---|
1453 |
|
---|
1454 | /* Open the old file with new name. */
|
---|
1455 | rc = vhdOpenImage(pImage, pImage->uOpenFlags);
|
---|
1456 | }
|
---|
1457 | else
|
---|
1458 | {
|
---|
1459 | /* The move failed, try to reopen the original image. */
|
---|
1460 | int rc2 = vhdOpenImage(pImage, pImage->uOpenFlags);
|
---|
1461 | if (RT_FAILURE(rc2))
|
---|
1462 | rc = rc2;
|
---|
1463 | }
|
---|
1464 | }
|
---|
1465 |
|
---|
1466 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1467 | return rc;
|
---|
1468 | }
|
---|
1469 |
|
---|
1470 | /** @interface_method_impl{VDIMAGEBACKEND,pfnClose} */
|
---|
1471 | static DECLCALLBACK(int) vhdClose(void *pBackendData, bool fDelete)
|
---|
1472 | {
|
---|
1473 | LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
|
---|
1474 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1475 |
|
---|
1476 | int rc = vhdFreeImage(pImage, fDelete);
|
---|
1477 | RTMemFree(pImage);
|
---|
1478 |
|
---|
1479 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1480 | return rc;
|
---|
1481 | }
|
---|
1482 |
|
---|
1483 | /** @interface_method_impl{VDIMAGEBACKEND,pfnRead} */
|
---|
1484 | static DECLCALLBACK(int) vhdRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
|
---|
1485 | PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
|
---|
1486 | {
|
---|
1487 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1488 | int rc = VINF_SUCCESS;
|
---|
1489 |
|
---|
1490 | LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
|
---|
1491 | pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
|
---|
1492 |
|
---|
1493 | AssertPtr(pImage);
|
---|
1494 | Assert(uOffset % 512 == 0);
|
---|
1495 | Assert(cbToRead % 512 == 0);
|
---|
1496 | AssertReturn((VALID_PTR(pIoCtx) && cbToRead), VERR_INVALID_PARAMETER);
|
---|
1497 | AssertReturn(uOffset + cbToRead <= pImage->cbSize, VERR_INVALID_PARAMETER);
|
---|
1498 |
|
---|
1499 | /*
|
---|
1500 | * If we have a dynamic disk image, we need to find the data block and sector to read.
|
---|
1501 | */
|
---|
1502 | if (pImage->pBlockAllocationTable)
|
---|
1503 | {
|
---|
1504 | /*
|
---|
1505 | * Get the data block first.
|
---|
1506 | */
|
---|
1507 | uint32_t cBlockAllocationTableEntry = (uOffset / VHD_SECTOR_SIZE) / pImage->cSectorsPerDataBlock;
|
---|
1508 | uint32_t cBATEntryIndex = (uOffset / VHD_SECTOR_SIZE) % pImage->cSectorsPerDataBlock;
|
---|
1509 | uint64_t uVhdOffset;
|
---|
1510 |
|
---|
1511 | LogFlowFunc(("cBlockAllocationTableEntry=%u cBatEntryIndex=%u\n", cBlockAllocationTableEntry, cBATEntryIndex));
|
---|
1512 | LogFlowFunc(("BlockAllocationEntry=%u\n", pImage->pBlockAllocationTable[cBlockAllocationTableEntry]));
|
---|
1513 |
|
---|
1514 | /*
|
---|
1515 | * Clip read range to remain in this data block.
|
---|
1516 | */
|
---|
1517 | cbToRead = RT_MIN(cbToRead, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
|
---|
1518 |
|
---|
1519 | /*
|
---|
1520 | * If the block is not allocated the content of the entry is ~0
|
---|
1521 | */
|
---|
1522 | if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
|
---|
1523 | rc = VERR_VD_BLOCK_FREE;
|
---|
1524 | else
|
---|
1525 | {
|
---|
1526 | uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
|
---|
1527 | LogFlowFunc(("uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
|
---|
1528 |
|
---|
1529 | /* Read in the block's bitmap. */
|
---|
1530 | PVDMETAXFER pMetaXfer;
|
---|
1531 | rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1532 | ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
|
---|
1533 | pImage->pu8Bitmap, pImage->cbDataBlockBitmap,
|
---|
1534 | pIoCtx, &pMetaXfer, NULL, NULL);
|
---|
1535 |
|
---|
1536 | if (RT_SUCCESS(rc))
|
---|
1537 | {
|
---|
1538 | uint32_t cSectors = 0;
|
---|
1539 |
|
---|
1540 | vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
|
---|
1541 | if (vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
|
---|
1542 | {
|
---|
1543 | cBATEntryIndex++;
|
---|
1544 | cSectors = 1;
|
---|
1545 |
|
---|
1546 | /*
|
---|
1547 | * The first sector being read is marked dirty, read as much as we
|
---|
1548 | * can from child. Note that only sectors that are marked dirty
|
---|
1549 | * must be read from child.
|
---|
1550 | */
|
---|
1551 | while ( (cSectors < (cbToRead / VHD_SECTOR_SIZE))
|
---|
1552 | && vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
|
---|
1553 | {
|
---|
1554 | cBATEntryIndex++;
|
---|
1555 | cSectors++;
|
---|
1556 | }
|
---|
1557 |
|
---|
1558 | cbToRead = cSectors * VHD_SECTOR_SIZE;
|
---|
1559 |
|
---|
1560 | LogFlowFunc(("uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
|
---|
1561 | rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage,
|
---|
1562 | uVhdOffset, pIoCtx, cbToRead);
|
---|
1563 | }
|
---|
1564 | else
|
---|
1565 | {
|
---|
1566 | /*
|
---|
1567 | * The first sector being read is marked clean, so we should read from
|
---|
1568 | * our parent instead, but only as much as there are the following
|
---|
1569 | * clean sectors, because the block may still contain dirty sectors
|
---|
1570 | * further on. We just need to compute the number of clean sectors
|
---|
1571 | * and pass it to our caller along with the notification that they
|
---|
1572 | * should be read from the parent.
|
---|
1573 | */
|
---|
1574 | cBATEntryIndex++;
|
---|
1575 | cSectors = 1;
|
---|
1576 |
|
---|
1577 | while ( (cSectors < (cbToRead / VHD_SECTOR_SIZE))
|
---|
1578 | && !vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
|
---|
1579 | {
|
---|
1580 | cBATEntryIndex++;
|
---|
1581 | cSectors++;
|
---|
1582 | }
|
---|
1583 |
|
---|
1584 | cbToRead = cSectors * VHD_SECTOR_SIZE;
|
---|
1585 | LogFunc(("Sectors free: uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
|
---|
1586 | rc = VERR_VD_BLOCK_FREE;
|
---|
1587 | }
|
---|
1588 | }
|
---|
1589 | else
|
---|
1590 | AssertMsg(rc == VERR_VD_NOT_ENOUGH_METADATA, ("Reading block bitmap failed rc=%Rrc\n", rc));
|
---|
1591 | }
|
---|
1592 | }
|
---|
1593 | else
|
---|
1594 | rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, uOffset, pIoCtx, cbToRead);
|
---|
1595 |
|
---|
1596 | if (pcbActuallyRead)
|
---|
1597 | *pcbActuallyRead = cbToRead;
|
---|
1598 |
|
---|
1599 | LogFlowFunc(("returns rc=%Rrc\n", rc));
|
---|
1600 | return rc;
|
---|
1601 | }
|
---|
1602 |
|
---|
1603 | /** @interface_method_impl{VDIMAGEBACKEND,pfnWrite} */
|
---|
1604 | static DECLCALLBACK(int) vhdWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
|
---|
1605 | PVDIOCTX pIoCtx, size_t *pcbWriteProcess, size_t *pcbPreRead,
|
---|
1606 | size_t *pcbPostRead, unsigned fWrite)
|
---|
1607 | {
|
---|
1608 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1609 | int rc = VINF_SUCCESS;
|
---|
1610 |
|
---|
1611 | LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
|
---|
1612 | pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
|
---|
1613 |
|
---|
1614 | AssertPtr(pImage);
|
---|
1615 | Assert(!(uOffset % VHD_SECTOR_SIZE));
|
---|
1616 | Assert(!(cbToWrite % VHD_SECTOR_SIZE));
|
---|
1617 | AssertReturn((VALID_PTR(pIoCtx) && cbToWrite), VERR_INVALID_PARAMETER);
|
---|
1618 | AssertReturn(uOffset + cbToWrite <= pImage->cbSize, VERR_INVALID_PARAMETER);
|
---|
1619 |
|
---|
1620 | if (pImage->pBlockAllocationTable)
|
---|
1621 | {
|
---|
1622 | /*
|
---|
1623 | * Get the data block first.
|
---|
1624 | */
|
---|
1625 | uint32_t cSector = uOffset / VHD_SECTOR_SIZE;
|
---|
1626 | uint32_t cBlockAllocationTableEntry = cSector / pImage->cSectorsPerDataBlock;
|
---|
1627 | uint32_t cBATEntryIndex = cSector % pImage->cSectorsPerDataBlock;
|
---|
1628 | uint64_t uVhdOffset;
|
---|
1629 |
|
---|
1630 | /*
|
---|
1631 | * Clip write range.
|
---|
1632 | */
|
---|
1633 | cbToWrite = RT_MIN(cbToWrite, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
|
---|
1634 |
|
---|
1635 | /*
|
---|
1636 | * If the block is not allocated the content of the entry is ~0
|
---|
1637 | * and we need to allocate a new block. Note that while blocks are
|
---|
1638 | * allocated with a relatively big granularity, each sector has its
|
---|
1639 | * own bitmap entry, indicating whether it has been written or not.
|
---|
1640 | * So that means for the purposes of the higher level that the
|
---|
1641 | * granularity is invisible. This means there's no need to return
|
---|
1642 | * VERR_VD_BLOCK_FREE unless the block hasn't been allocated yet.
|
---|
1643 | */
|
---|
1644 | if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
|
---|
1645 | {
|
---|
1646 | /* Check if the block allocation should be suppressed. */
|
---|
1647 | if ( (fWrite & VD_WRITE_NO_ALLOC)
|
---|
1648 | || (cbToWrite != pImage->cbDataBlock))
|
---|
1649 | {
|
---|
1650 | *pcbPreRead = cBATEntryIndex * VHD_SECTOR_SIZE;
|
---|
1651 | *pcbPostRead = pImage->cSectorsPerDataBlock * VHD_SECTOR_SIZE - cbToWrite - *pcbPreRead;
|
---|
1652 |
|
---|
1653 | if (pcbWriteProcess)
|
---|
1654 | *pcbWriteProcess = cbToWrite;
|
---|
1655 | return VERR_VD_BLOCK_FREE;
|
---|
1656 | }
|
---|
1657 |
|
---|
1658 | PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)RTMemAllocZ(RT_OFFSETOF(VHDIMAGEEXPAND, au8Bitmap[pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE]));
|
---|
1659 | bool fIoInProgress = false;
|
---|
1660 |
|
---|
1661 | if (!pExpand)
|
---|
1662 | return VERR_NO_MEMORY;
|
---|
1663 |
|
---|
1664 | pExpand->cbEofOld = pImage->uCurrentEndOfFile;
|
---|
1665 | pExpand->idxBatAllocated = cBlockAllocationTableEntry;
|
---|
1666 | pExpand->idxBlockBe = RT_H2BE_U32(pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE);
|
---|
1667 |
|
---|
1668 | /* Set the bits for all sectors having been written. */
|
---|
1669 | for (uint32_t iSector = 0; iSector < (cbToWrite / VHD_SECTOR_SIZE); iSector++)
|
---|
1670 | {
|
---|
1671 | /* No need to check for a changed value because this is an initial write. */
|
---|
1672 | vhdBlockBitmapSectorSet(pImage, pExpand->au8Bitmap, cBATEntryIndex);
|
---|
1673 | cBATEntryIndex++;
|
---|
1674 | }
|
---|
1675 |
|
---|
1676 | do
|
---|
1677 | {
|
---|
1678 | /*
|
---|
1679 | * Start with the sector bitmap.
|
---|
1680 | */
|
---|
1681 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1682 | pImage->uCurrentEndOfFile,
|
---|
1683 | pExpand->au8Bitmap,
|
---|
1684 | pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE, pIoCtx,
|
---|
1685 | vhdAsyncExpansionDataBlockBitmapComplete,
|
---|
1686 | pExpand);
|
---|
1687 | if (RT_SUCCESS(rc))
|
---|
1688 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
|
---|
1689 | else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1690 | fIoInProgress = true;
|
---|
1691 | else
|
---|
1692 | {
|
---|
1693 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1694 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1695 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1696 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1697 | break;
|
---|
1698 | }
|
---|
1699 |
|
---|
1700 |
|
---|
1701 | /*
|
---|
1702 | * Write the new block at the current end of the file.
|
---|
1703 | */
|
---|
1704 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1705 | pImage->uCurrentEndOfFile + (pImage->cDataBlockBitmapSectors + (cSector % pImage->cSectorsPerDataBlock)) * VHD_SECTOR_SIZE,
|
---|
1706 | pIoCtx, cbToWrite,
|
---|
1707 | vhdAsyncExpansionDataComplete,
|
---|
1708 | pExpand);
|
---|
1709 | if (RT_SUCCESS(rc))
|
---|
1710 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
|
---|
1711 | else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1712 | fIoInProgress = true;
|
---|
1713 | else
|
---|
1714 | {
|
---|
1715 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1716 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1717 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1718 | break;
|
---|
1719 | }
|
---|
1720 |
|
---|
1721 | /*
|
---|
1722 | * Write entry in the BAT.
|
---|
1723 | */
|
---|
1724 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1725 | pImage->uBlockAllocationTableOffset + cBlockAllocationTableEntry * sizeof(uint32_t),
|
---|
1726 | &pExpand->idxBlockBe, sizeof(uint32_t), pIoCtx,
|
---|
1727 | vhdAsyncExpansionBatUpdateComplete,
|
---|
1728 | pExpand);
|
---|
1729 | if (RT_SUCCESS(rc))
|
---|
1730 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
|
---|
1731 | else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1732 | fIoInProgress = true;
|
---|
1733 | else
|
---|
1734 | {
|
---|
1735 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1736 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1737 | break;
|
---|
1738 | }
|
---|
1739 |
|
---|
1740 | /*
|
---|
1741 | * Set the new end of the file and link the new block into the BAT.
|
---|
1742 | */
|
---|
1743 | pImage->uCurrentEndOfFile += pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE + pImage->cbDataBlock;
|
---|
1744 |
|
---|
1745 | /* Update the footer. */
|
---|
1746 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1747 | pImage->uCurrentEndOfFile,
|
---|
1748 | &pImage->vhdFooterCopy,
|
---|
1749 | sizeof(VHDFooter), pIoCtx,
|
---|
1750 | vhdAsyncExpansionFooterUpdateComplete,
|
---|
1751 | pExpand);
|
---|
1752 | if (RT_SUCCESS(rc))
|
---|
1753 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
|
---|
1754 | else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1755 | fIoInProgress = true;
|
---|
1756 | else
|
---|
1757 | {
|
---|
1758 | VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
|
---|
1759 | break;
|
---|
1760 | }
|
---|
1761 |
|
---|
1762 | } while (0);
|
---|
1763 |
|
---|
1764 | if (!fIoInProgress)
|
---|
1765 | vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
|
---|
1766 | else
|
---|
1767 | rc = VERR_VD_ASYNC_IO_IN_PROGRESS;
|
---|
1768 | }
|
---|
1769 | else
|
---|
1770 | {
|
---|
1771 | /*
|
---|
1772 | * Calculate the real offset in the file.
|
---|
1773 | */
|
---|
1774 | uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
|
---|
1775 |
|
---|
1776 | /* Read in the block's bitmap. */
|
---|
1777 | PVDMETAXFER pMetaXfer;
|
---|
1778 | rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1779 | ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
|
---|
1780 | pImage->pu8Bitmap,
|
---|
1781 | pImage->cbDataBlockBitmap, pIoCtx,
|
---|
1782 | &pMetaXfer, NULL, NULL);
|
---|
1783 | if (RT_SUCCESS(rc))
|
---|
1784 | {
|
---|
1785 | vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
|
---|
1786 |
|
---|
1787 | /* Write data. */
|
---|
1788 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1789 | uVhdOffset, pIoCtx, cbToWrite,
|
---|
1790 | NULL, NULL);
|
---|
1791 | if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1792 | {
|
---|
1793 | bool fChanged = false;
|
---|
1794 |
|
---|
1795 | /* Set the bits for all sectors having been written. */
|
---|
1796 | for (uint32_t iSector = 0; iSector < (cbToWrite / VHD_SECTOR_SIZE); iSector++)
|
---|
1797 | {
|
---|
1798 | fChanged |= vhdBlockBitmapSectorSet(pImage, pImage->pu8Bitmap, cBATEntryIndex);
|
---|
1799 | cBATEntryIndex++;
|
---|
1800 | }
|
---|
1801 |
|
---|
1802 | /* Only write the bitmap if it was changed. */
|
---|
1803 | if (fChanged)
|
---|
1804 | {
|
---|
1805 | /*
|
---|
1806 | * Write the bitmap back.
|
---|
1807 | *
|
---|
1808 | * @note We don't have a completion callback here because we
|
---|
1809 | * can't do anything if the write fails for some reason.
|
---|
1810 | * The error will propagated to the device/guest
|
---|
1811 | * by the generic VD layer already and we don't need
|
---|
1812 | * to rollback anything here.
|
---|
1813 | */
|
---|
1814 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1815 | ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
|
---|
1816 | pImage->pu8Bitmap,
|
---|
1817 | pImage->cbDataBlockBitmap,
|
---|
1818 | pIoCtx, NULL, NULL);
|
---|
1819 | }
|
---|
1820 | }
|
---|
1821 | }
|
---|
1822 | }
|
---|
1823 | }
|
---|
1824 | else
|
---|
1825 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1826 | uOffset, pIoCtx, cbToWrite, NULL, NULL);
|
---|
1827 |
|
---|
1828 | if (pcbWriteProcess)
|
---|
1829 | *pcbWriteProcess = cbToWrite;
|
---|
1830 |
|
---|
1831 | /* Stay on the safe side. Do not run the risk of confusing the higher
|
---|
1832 | * level, as that can be pretty lethal to image consistency. */
|
---|
1833 | *pcbPreRead = 0;
|
---|
1834 | *pcbPostRead = 0;
|
---|
1835 |
|
---|
1836 | return rc;
|
---|
1837 | }
|
---|
1838 |
|
---|
1839 | /** @interface_method_impl{VDIMAGEBACKEND,pfnFlush} */
|
---|
1840 | static DECLCALLBACK(int) vhdFlush(void *pBackendData, PVDIOCTX pIoCtx)
|
---|
1841 | {
|
---|
1842 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1843 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1844 |
|
---|
1845 | /* No need to write anything here. Data is always updated on a write. */
|
---|
1846 | int rc = vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage, pIoCtx, NULL, NULL);
|
---|
1847 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1848 | return rc;
|
---|
1849 | }
|
---|
1850 |
|
---|
1851 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetVersion} */
|
---|
1852 | static DECLCALLBACK(unsigned) vhdGetVersion(void *pBackendData)
|
---|
1853 | {
|
---|
1854 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1855 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1856 |
|
---|
1857 | AssertPtrReturn(pImage, 0);
|
---|
1858 |
|
---|
1859 | unsigned uVersion = 1; /**< @todo use correct version */
|
---|
1860 |
|
---|
1861 | LogFlowFunc(("returns %u\n", uVersion));
|
---|
1862 | return uVersion;
|
---|
1863 | }
|
---|
1864 |
|
---|
1865 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetFileSize} */
|
---|
1866 | static DECLCALLBACK(uint64_t) vhdGetFileSize(void *pBackendData)
|
---|
1867 | {
|
---|
1868 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1869 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1870 | uint64_t cb = 0;
|
---|
1871 |
|
---|
1872 | AssertPtrReturn(pImage, 0);
|
---|
1873 |
|
---|
1874 | if (pImage->pStorage)
|
---|
1875 | cb = pImage->uCurrentEndOfFile + sizeof(VHDFooter);
|
---|
1876 |
|
---|
1877 | LogFlowFunc(("returns %lld\n", cb));
|
---|
1878 | return cb;
|
---|
1879 | }
|
---|
1880 |
|
---|
1881 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetPCHSGeometry} */
|
---|
1882 | static DECLCALLBACK(int) vhdGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
|
---|
1883 | {
|
---|
1884 | LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
|
---|
1885 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1886 | int rc = VINF_SUCCESS;
|
---|
1887 |
|
---|
1888 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1889 |
|
---|
1890 | if (pImage->PCHSGeometry.cCylinders)
|
---|
1891 | *pPCHSGeometry = pImage->PCHSGeometry;
|
---|
1892 | else
|
---|
1893 | rc = VERR_VD_GEOMETRY_NOT_SET;
|
---|
1894 |
|
---|
1895 | LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->PCHSGeometry.cCylinders,
|
---|
1896 | pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors));
|
---|
1897 | return rc;
|
---|
1898 | }
|
---|
1899 |
|
---|
1900 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetPCHSGeometry} */
|
---|
1901 | static DECLCALLBACK(int) vhdSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
|
---|
1902 | {
|
---|
1903 | LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n",
|
---|
1904 | pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
|
---|
1905 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1906 | int rc = VINF_SUCCESS;
|
---|
1907 |
|
---|
1908 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1909 |
|
---|
1910 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
1911 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
1912 | else
|
---|
1913 | pImage->PCHSGeometry = *pPCHSGeometry;
|
---|
1914 |
|
---|
1915 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1916 | return rc;
|
---|
1917 | }
|
---|
1918 |
|
---|
1919 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetLCHSGeometry} */
|
---|
1920 | static DECLCALLBACK(int) vhdGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
|
---|
1921 | {
|
---|
1922 | LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
|
---|
1923 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1924 | int rc = VINF_SUCCESS;
|
---|
1925 |
|
---|
1926 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1927 |
|
---|
1928 | if (pImage->LCHSGeometry.cCylinders)
|
---|
1929 | *pLCHSGeometry = pImage->LCHSGeometry;
|
---|
1930 | else
|
---|
1931 | rc = VERR_VD_GEOMETRY_NOT_SET;
|
---|
1932 |
|
---|
1933 | LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->LCHSGeometry.cCylinders,
|
---|
1934 | pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors));
|
---|
1935 | return rc;
|
---|
1936 | }
|
---|
1937 |
|
---|
1938 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetLCHSGeometry} */
|
---|
1939 | static DECLCALLBACK(int) vhdSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
|
---|
1940 | {
|
---|
1941 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1942 | int rc = VINF_SUCCESS;
|
---|
1943 |
|
---|
1944 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1945 |
|
---|
1946 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
1947 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
1948 | else
|
---|
1949 | pImage->LCHSGeometry = *pLCHSGeometry;
|
---|
1950 |
|
---|
1951 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1952 | return rc;
|
---|
1953 | }
|
---|
1954 |
|
---|
1955 | /** @copydoc VDIMAGEBACKEND::pfnQueryRegions */
|
---|
1956 | static DECLCALLBACK(int) vhdQueryRegions(void *pBackendData, PCVDREGIONLIST *ppRegionList)
|
---|
1957 | {
|
---|
1958 | LogFlowFunc(("pBackendData=%#p ppRegionList=%#p\n", pBackendData, ppRegionList));
|
---|
1959 | PVHDIMAGE pThis = (PVHDIMAGE)pBackendData;
|
---|
1960 |
|
---|
1961 | AssertPtrReturn(pThis, VERR_VD_NOT_OPENED);
|
---|
1962 |
|
---|
1963 | *ppRegionList = &pThis->RegionList;
|
---|
1964 | LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
|
---|
1965 | return VINF_SUCCESS;
|
---|
1966 | }
|
---|
1967 |
|
---|
1968 | /** @copydoc VDIMAGEBACKEND::pfnRegionListRelease */
|
---|
1969 | static DECLCALLBACK(void) vhdRegionListRelease(void *pBackendData, PCVDREGIONLIST pRegionList)
|
---|
1970 | {
|
---|
1971 | RT_NOREF1(pRegionList);
|
---|
1972 | LogFlowFunc(("pBackendData=%#p pRegionList=%#p\n", pBackendData, pRegionList));
|
---|
1973 | PVHDIMAGE pThis = (PVHDIMAGE)pBackendData;
|
---|
1974 | AssertPtr(pThis); RT_NOREF(pThis);
|
---|
1975 |
|
---|
1976 | /* Nothing to do here. */
|
---|
1977 | }
|
---|
1978 |
|
---|
1979 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetImageFlags} */
|
---|
1980 | static DECLCALLBACK(unsigned) vhdGetImageFlags(void *pBackendData)
|
---|
1981 | {
|
---|
1982 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1983 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1984 |
|
---|
1985 | AssertPtrReturn(pImage, 0);
|
---|
1986 |
|
---|
1987 | LogFlowFunc(("returns %#x\n", pImage->uImageFlags));
|
---|
1988 | return pImage->uImageFlags;
|
---|
1989 | }
|
---|
1990 |
|
---|
1991 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetOpenFlags} */
|
---|
1992 | static DECLCALLBACK(unsigned) vhdGetOpenFlags(void *pBackendData)
|
---|
1993 | {
|
---|
1994 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1995 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
1996 |
|
---|
1997 | AssertPtrReturn(pImage, 0);
|
---|
1998 |
|
---|
1999 | LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
|
---|
2000 | return pImage->uOpenFlags;
|
---|
2001 | }
|
---|
2002 |
|
---|
2003 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetOpenFlags} */
|
---|
2004 | static DECLCALLBACK(int) vhdSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
|
---|
2005 | {
|
---|
2006 | LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
|
---|
2007 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2008 | int rc = VINF_SUCCESS;
|
---|
2009 |
|
---|
2010 | /* Image must be opened and the new flags must be valid. */
|
---|
2011 | if (!pImage || (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO
|
---|
2012 | | VD_OPEN_FLAGS_ASYNC_IO | VD_OPEN_FLAGS_SHAREABLE
|
---|
2013 | | VD_OPEN_FLAGS_SEQUENTIAL | VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)))
|
---|
2014 | rc = VERR_INVALID_PARAMETER;
|
---|
2015 | else
|
---|
2016 | {
|
---|
2017 | /* Implement this operation via reopening the image. */
|
---|
2018 | rc = vhdFreeImage(pImage, false);
|
---|
2019 | if (RT_SUCCESS(rc))
|
---|
2020 | rc = vhdOpenImage(pImage, uOpenFlags);
|
---|
2021 | }
|
---|
2022 |
|
---|
2023 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2024 | return rc;
|
---|
2025 | }
|
---|
2026 |
|
---|
2027 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetComment} */
|
---|
2028 | static DECLCALLBACK(int) vhdGetComment(void *pBackendData, char *pszComment,
|
---|
2029 | size_t cbComment)
|
---|
2030 | {
|
---|
2031 | RT_NOREF2(pszComment, cbComment);
|
---|
2032 | LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
|
---|
2033 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2034 |
|
---|
2035 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2036 |
|
---|
2037 | LogFlowFunc(("returns %Rrc comment='%s'\n", VERR_NOT_SUPPORTED, pszComment));
|
---|
2038 | return VERR_NOT_SUPPORTED;
|
---|
2039 | }
|
---|
2040 |
|
---|
2041 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetComment} */
|
---|
2042 | static DECLCALLBACK(int) vhdSetComment(void *pBackendData, const char *pszComment)
|
---|
2043 | {
|
---|
2044 | RT_NOREF1(pszComment);
|
---|
2045 | LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
|
---|
2046 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2047 |
|
---|
2048 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2049 |
|
---|
2050 | int rc;
|
---|
2051 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2052 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2053 | else
|
---|
2054 | rc = VERR_NOT_SUPPORTED;
|
---|
2055 |
|
---|
2056 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2057 | return rc;
|
---|
2058 | }
|
---|
2059 |
|
---|
2060 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetUuid} */
|
---|
2061 | static DECLCALLBACK(int) vhdGetUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2062 | {
|
---|
2063 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2064 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2065 |
|
---|
2066 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2067 |
|
---|
2068 | *pUuid = pImage->ImageUuid;
|
---|
2069 |
|
---|
2070 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VINF_SUCCESS, pUuid));
|
---|
2071 | return VINF_SUCCESS;
|
---|
2072 | }
|
---|
2073 |
|
---|
2074 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetUuid} */
|
---|
2075 | static DECLCALLBACK(int) vhdSetUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2076 | {
|
---|
2077 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2078 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2079 | int rc = VINF_SUCCESS;
|
---|
2080 |
|
---|
2081 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2082 |
|
---|
2083 | if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
|
---|
2084 | {
|
---|
2085 | pImage->ImageUuid = *pUuid;
|
---|
2086 | /* Update the footer copy. It will get written to disk when the image is closed. */
|
---|
2087 | memcpy(&pImage->vhdFooterCopy.UniqueID, pUuid, 16);
|
---|
2088 | /* Update checksum. */
|
---|
2089 | pImage->vhdFooterCopy.Checksum = 0;
|
---|
2090 | pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
|
---|
2091 |
|
---|
2092 | /* Need to update the dynamic disk header to update the disk footer copy at the beginning. */
|
---|
2093 | if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
|
---|
2094 | pImage->fDynHdrNeedsUpdate = true;
|
---|
2095 | }
|
---|
2096 | else
|
---|
2097 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2098 |
|
---|
2099 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2100 | return rc;
|
---|
2101 | }
|
---|
2102 |
|
---|
2103 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetModificationUuid} */
|
---|
2104 | static DECLCALLBACK(int) vhdGetModificationUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2105 | {
|
---|
2106 | RT_NOREF1(pUuid);
|
---|
2107 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2108 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2109 |
|
---|
2110 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2111 |
|
---|
2112 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2113 | return VERR_NOT_SUPPORTED;
|
---|
2114 | }
|
---|
2115 |
|
---|
2116 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetModificationUuid} */
|
---|
2117 | static DECLCALLBACK(int) vhdSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2118 | {
|
---|
2119 | RT_NOREF1(pUuid);
|
---|
2120 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2121 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2122 |
|
---|
2123 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2124 |
|
---|
2125 | int rc;
|
---|
2126 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2127 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2128 | else
|
---|
2129 | rc = VERR_NOT_SUPPORTED;
|
---|
2130 |
|
---|
2131 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2132 | return rc;
|
---|
2133 | }
|
---|
2134 |
|
---|
2135 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentUuid} */
|
---|
2136 | static DECLCALLBACK(int) vhdGetParentUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2137 | {
|
---|
2138 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2139 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2140 |
|
---|
2141 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2142 |
|
---|
2143 | *pUuid = pImage->ParentUuid;
|
---|
2144 |
|
---|
2145 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VINF_SUCCESS, pUuid));
|
---|
2146 | return VINF_SUCCESS;
|
---|
2147 | }
|
---|
2148 |
|
---|
2149 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentUuid} */
|
---|
2150 | static DECLCALLBACK(int) vhdSetParentUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2151 | {
|
---|
2152 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2153 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2154 | int rc = VINF_SUCCESS;
|
---|
2155 |
|
---|
2156 | if (pImage && pImage->pStorage)
|
---|
2157 | {
|
---|
2158 | if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
|
---|
2159 | {
|
---|
2160 | pImage->ParentUuid = *pUuid;
|
---|
2161 | pImage->fDynHdrNeedsUpdate = true;
|
---|
2162 | }
|
---|
2163 | else
|
---|
2164 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2165 | }
|
---|
2166 | else
|
---|
2167 | rc = VERR_VD_NOT_OPENED;
|
---|
2168 |
|
---|
2169 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2170 | return rc;
|
---|
2171 | }
|
---|
2172 |
|
---|
2173 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentModificationUuid} */
|
---|
2174 | static DECLCALLBACK(int) vhdGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2175 | {
|
---|
2176 | RT_NOREF1(pUuid);
|
---|
2177 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2178 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2179 |
|
---|
2180 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2181 |
|
---|
2182 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2183 | return VERR_NOT_SUPPORTED;
|
---|
2184 | }
|
---|
2185 |
|
---|
2186 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentModificationUuid} */
|
---|
2187 | static DECLCALLBACK(int) vhdSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2188 | {
|
---|
2189 | RT_NOREF1(pUuid);
|
---|
2190 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2191 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2192 |
|
---|
2193 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2194 |
|
---|
2195 | int rc;
|
---|
2196 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2197 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2198 | else
|
---|
2199 | rc = VERR_NOT_SUPPORTED;
|
---|
2200 |
|
---|
2201 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2202 | return rc;
|
---|
2203 | }
|
---|
2204 |
|
---|
2205 | /** @interface_method_impl{VDIMAGEBACKEND,pfnDump} */
|
---|
2206 | static DECLCALLBACK(void) vhdDump(void *pBackendData)
|
---|
2207 | {
|
---|
2208 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2209 |
|
---|
2210 | AssertPtrReturnVoid(pImage);
|
---|
2211 | vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%u\n",
|
---|
2212 | pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
|
---|
2213 | pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
|
---|
2214 | VHD_SECTOR_SIZE);
|
---|
2215 | vdIfErrorMessage(pImage->pIfError, "Header: uuidCreation={%RTuuid}\n", &pImage->ImageUuid);
|
---|
2216 | vdIfErrorMessage(pImage->pIfError, "Header: uuidParent={%RTuuid}\n", &pImage->ParentUuid);
|
---|
2217 | }
|
---|
2218 |
|
---|
2219 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetTimestamp} */
|
---|
2220 | static DECLCALLBACK(int) vhdGetTimestamp(void *pBackendData, PRTTIMESPEC pTimestamp)
|
---|
2221 | {
|
---|
2222 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2223 |
|
---|
2224 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2225 |
|
---|
2226 | int rc = vdIfIoIntFileGetModificationTime(pImage->pIfIo, pImage->pszFilename, pTimestamp);
|
---|
2227 |
|
---|
2228 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2229 | return rc;
|
---|
2230 | }
|
---|
2231 |
|
---|
2232 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentTimestamp} */
|
---|
2233 | static DECLCALLBACK(int) vhdGetParentTimestamp(void *pBackendData, PRTTIMESPEC pTimestamp)
|
---|
2234 | {
|
---|
2235 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2236 |
|
---|
2237 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2238 |
|
---|
2239 | vhdTime2RtTime(pTimestamp, pImage->u32ParentTimestamp);
|
---|
2240 | LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
|
---|
2241 | return VINF_SUCCESS;
|
---|
2242 | }
|
---|
2243 |
|
---|
2244 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentTimestamp} */
|
---|
2245 | static DECLCALLBACK(int) vhdSetParentTimestamp(void *pBackendData, PCRTTIMESPEC pTimestamp)
|
---|
2246 | {
|
---|
2247 | int rc = VINF_SUCCESS;
|
---|
2248 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2249 |
|
---|
2250 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2251 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2252 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2253 | else
|
---|
2254 | {
|
---|
2255 | pImage->u32ParentTimestamp = vhdRtTime2VhdTime(pTimestamp);
|
---|
2256 | pImage->fDynHdrNeedsUpdate = true;
|
---|
2257 | }
|
---|
2258 |
|
---|
2259 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2260 | return rc;
|
---|
2261 | }
|
---|
2262 |
|
---|
2263 | /** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentFilename} */
|
---|
2264 | static DECLCALLBACK(int) vhdGetParentFilename(void *pBackendData, char **ppszParentFilename)
|
---|
2265 | {
|
---|
2266 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2267 |
|
---|
2268 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2269 | *ppszParentFilename = RTStrDup(pImage->pszParentFilename);
|
---|
2270 |
|
---|
2271 | LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
|
---|
2272 | return VINF_SUCCESS;
|
---|
2273 | }
|
---|
2274 |
|
---|
2275 | /** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentFilename} */
|
---|
2276 | static DECLCALLBACK(int) vhdSetParentFilename(void *pBackendData, const char *pszParentFilename)
|
---|
2277 | {
|
---|
2278 | int rc = VINF_SUCCESS;
|
---|
2279 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2280 |
|
---|
2281 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2282 |
|
---|
2283 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2284 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2285 | else
|
---|
2286 | {
|
---|
2287 | if (pImage->pszParentFilename)
|
---|
2288 | RTStrFree(pImage->pszParentFilename);
|
---|
2289 | pImage->pszParentFilename = RTStrDup(pszParentFilename);
|
---|
2290 | if (!pImage->pszParentFilename)
|
---|
2291 | rc = VERR_NO_MEMORY;
|
---|
2292 | else
|
---|
2293 | pImage->fDynHdrNeedsUpdate = true;
|
---|
2294 | }
|
---|
2295 |
|
---|
2296 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2297 | return rc;
|
---|
2298 | }
|
---|
2299 |
|
---|
2300 | /** @interface_method_impl{VDIMAGEBACKEND,pfnCompact} */
|
---|
2301 | static DECLCALLBACK(int) vhdCompact(void *pBackendData, unsigned uPercentStart,
|
---|
2302 | unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
|
---|
2303 | PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
|
---|
2304 | {
|
---|
2305 | RT_NOREF2(pVDIfsDisk, pVDIfsImage);
|
---|
2306 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2307 | int rc = VINF_SUCCESS;
|
---|
2308 | void *pvBuf = NULL;
|
---|
2309 | uint32_t *paBlocks = NULL;
|
---|
2310 | PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
|
---|
2311 |
|
---|
2312 | DECLCALLBACKMEMBER(int, pfnParentRead)(void *, uint64_t, void *, size_t) = NULL;
|
---|
2313 | void *pvParent = NULL;
|
---|
2314 | PVDINTERFACEPARENTSTATE pIfParentState = VDIfParentStateGet(pVDIfsOperation);
|
---|
2315 | if (pIfParentState)
|
---|
2316 | {
|
---|
2317 | pfnParentRead = pIfParentState->pfnParentRead;
|
---|
2318 | pvParent = pIfParentState->Core.pvUser;
|
---|
2319 | }
|
---|
2320 |
|
---|
2321 | do
|
---|
2322 | {
|
---|
2323 | AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
|
---|
2324 |
|
---|
2325 | AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
|
---|
2326 | rc = VERR_VD_IMAGE_READ_ONLY);
|
---|
2327 |
|
---|
2328 | /* Reject fixed images as they don't have a BAT. */
|
---|
2329 | if (pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
|
---|
2330 | {
|
---|
2331 | rc = VERR_NOT_SUPPORTED;
|
---|
2332 | break;
|
---|
2333 | }
|
---|
2334 |
|
---|
2335 | if (pfnParentRead)
|
---|
2336 | {
|
---|
2337 | pvParent = RTMemTmpAlloc(pImage->cbDataBlock);
|
---|
2338 | AssertBreakStmt(pvParent, rc = VERR_NO_MEMORY);
|
---|
2339 | }
|
---|
2340 | pvBuf = RTMemTmpAlloc(pImage->cbDataBlock);
|
---|
2341 | AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
|
---|
2342 |
|
---|
2343 | unsigned cBlocksAllocated = 0;
|
---|
2344 | unsigned cBlocksToMove = 0;
|
---|
2345 | unsigned cBlocks = pImage->cBlockAllocationTableEntries;
|
---|
2346 | uint32_t offBlocksStart = ~0U; /* Start offset of data blocks in sectors. */
|
---|
2347 | uint32_t *paBat = pImage->pBlockAllocationTable;
|
---|
2348 |
|
---|
2349 | /* Count the number of allocated blocks and find the start offset for the data blocks. */
|
---|
2350 | for (unsigned i = 0; i < cBlocks; i++)
|
---|
2351 | if (paBat[i] != ~0U)
|
---|
2352 | {
|
---|
2353 | cBlocksAllocated++;
|
---|
2354 | if (paBat[i] < offBlocksStart)
|
---|
2355 | offBlocksStart = paBat[i];
|
---|
2356 | }
|
---|
2357 |
|
---|
2358 | if (!cBlocksAllocated)
|
---|
2359 | {
|
---|
2360 | /* Nothing to do. */
|
---|
2361 | rc = VINF_SUCCESS;
|
---|
2362 | break;
|
---|
2363 | }
|
---|
2364 |
|
---|
2365 | paBlocks = (uint32_t *)RTMemTmpAllocZ(cBlocksAllocated * sizeof(uint32_t));
|
---|
2366 | AssertBreakStmt(paBlocks, rc = VERR_NO_MEMORY);
|
---|
2367 |
|
---|
2368 | /* Invalidate the back resolving array. */
|
---|
2369 | for (unsigned i = 0; i < cBlocksAllocated; i++)
|
---|
2370 | paBlocks[i] = ~0U;
|
---|
2371 |
|
---|
2372 | /* Fill the back resolving table. */
|
---|
2373 | for (unsigned i = 0; i < cBlocks; i++)
|
---|
2374 | if (paBat[i] != ~0U)
|
---|
2375 | {
|
---|
2376 | unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
|
---|
2377 | if ( idxBlock < cBlocksAllocated
|
---|
2378 | && paBlocks[idxBlock] == ~0U)
|
---|
2379 | paBlocks[idxBlock] = i;
|
---|
2380 | else
|
---|
2381 | {
|
---|
2382 | /* The image is in an inconsistent state. Don't go further. */
|
---|
2383 | rc = VERR_INVALID_STATE;
|
---|
2384 | break;
|
---|
2385 | }
|
---|
2386 | }
|
---|
2387 |
|
---|
2388 | if (RT_FAILURE(rc))
|
---|
2389 | break;
|
---|
2390 |
|
---|
2391 | /* Find redundant information and update the block pointers
|
---|
2392 | * accordingly, creating bubbles. Keep disk up to date, as this
|
---|
2393 | * enables cancelling. */
|
---|
2394 | for (unsigned i = 0; i < cBlocks; i++)
|
---|
2395 | {
|
---|
2396 | if (paBat[i] != ~0U)
|
---|
2397 | {
|
---|
2398 | unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
|
---|
2399 |
|
---|
2400 | /* Block present in image file, read relevant data. */
|
---|
2401 | uint64_t u64Offset = ((uint64_t)paBat[i] + pImage->cDataBlockBitmapSectors) * VHD_SECTOR_SIZE;
|
---|
2402 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
2403 | u64Offset, pvBuf, pImage->cbDataBlock);
|
---|
2404 | if (RT_FAILURE(rc))
|
---|
2405 | break;
|
---|
2406 |
|
---|
2407 | if (ASMBitFirstSet((volatile void *)pvBuf, (uint32_t)pImage->cbDataBlock * 8) == -1)
|
---|
2408 | {
|
---|
2409 | paBat[i] = UINT32_MAX;
|
---|
2410 | paBlocks[idxBlock] = ~0U;
|
---|
2411 | /* Adjust progress info, one block to be relocated. */
|
---|
2412 | cBlocksToMove++;
|
---|
2413 | }
|
---|
2414 | else if (pfnParentRead)
|
---|
2415 | {
|
---|
2416 | rc = pfnParentRead(pvParent, (uint64_t)i * pImage->cbDataBlock, pvParent, pImage->cbDataBlock);
|
---|
2417 | if (RT_FAILURE(rc))
|
---|
2418 | break;
|
---|
2419 | if (!memcmp(pvParent, pvBuf, pImage->cbDataBlock))
|
---|
2420 | {
|
---|
2421 | paBat[i] = ~0U;
|
---|
2422 | paBlocks[idxBlock] = ~0U;
|
---|
2423 | /* Adjust progress info, one block to be relocated. */
|
---|
2424 | cBlocksToMove++;
|
---|
2425 | }
|
---|
2426 | }
|
---|
2427 | }
|
---|
2428 |
|
---|
2429 | vdIfProgress(pIfProgress, (uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
|
---|
2430 | }
|
---|
2431 |
|
---|
2432 | if (RT_SUCCESS(rc))
|
---|
2433 | {
|
---|
2434 | /* Fill bubbles with other data (if available). */
|
---|
2435 | unsigned cBlocksMoved = 0;
|
---|
2436 | unsigned uBlockUsedPos = cBlocksAllocated;
|
---|
2437 | size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of whole block containing the bitmap and the user data. */
|
---|
2438 |
|
---|
2439 | /* Allocate data buffer to hold the data block and allocation bitmap in front of the actual data. */
|
---|
2440 | RTMemTmpFree(pvBuf);
|
---|
2441 | pvBuf = RTMemTmpAllocZ(cbBlock);
|
---|
2442 | AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
|
---|
2443 |
|
---|
2444 | for (unsigned i = 0; i < cBlocksAllocated; i++)
|
---|
2445 | {
|
---|
2446 | unsigned uBlock = paBlocks[i];
|
---|
2447 | if (uBlock == ~0U)
|
---|
2448 | {
|
---|
2449 | unsigned uBlockData = ~0U;
|
---|
2450 | while (uBlockUsedPos > i && uBlockData == ~0U)
|
---|
2451 | {
|
---|
2452 | uBlockUsedPos--;
|
---|
2453 | uBlockData = paBlocks[uBlockUsedPos];
|
---|
2454 | }
|
---|
2455 | /* Terminate early if there is no block which needs copying. */
|
---|
2456 | if (uBlockUsedPos == i)
|
---|
2457 | break;
|
---|
2458 | uint64_t u64Offset = (uint64_t)uBlockUsedPos * cbBlock
|
---|
2459 | + (offBlocksStart * VHD_SECTOR_SIZE);
|
---|
2460 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
2461 | u64Offset, pvBuf, cbBlock);
|
---|
2462 | if (RT_FAILURE(rc))
|
---|
2463 | break;
|
---|
2464 |
|
---|
2465 | u64Offset = (uint64_t)i * cbBlock
|
---|
2466 | + (offBlocksStart * VHD_SECTOR_SIZE);
|
---|
2467 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
2468 | u64Offset, pvBuf, cbBlock);
|
---|
2469 | if (RT_FAILURE(rc))
|
---|
2470 | break;
|
---|
2471 |
|
---|
2472 | paBat[uBlockData] = i*(pImage->cSectorsPerDataBlock + pImage->cDataBlockBitmapSectors) + offBlocksStart;
|
---|
2473 |
|
---|
2474 | /* Truncate the file but leave enough room for the footer to avoid
|
---|
2475 | * races if other processes fill the whole harddisk. */
|
---|
2476 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
|
---|
2477 | pImage->uCurrentEndOfFile - cbBlock + VHD_SECTOR_SIZE);
|
---|
2478 | if (RT_FAILURE(rc))
|
---|
2479 | break;
|
---|
2480 |
|
---|
2481 | /* Update pointers and write footer. */
|
---|
2482 | pImage->uCurrentEndOfFile -= cbBlock;
|
---|
2483 |
|
---|
2484 | /* We're kinda screwed if this failes. */
|
---|
2485 | rc = vhdUpdateFooter(pImage);
|
---|
2486 | if (RT_FAILURE(rc))
|
---|
2487 | break;
|
---|
2488 |
|
---|
2489 | paBlocks[i] = uBlockData;
|
---|
2490 | paBlocks[uBlockUsedPos] = ~0U;
|
---|
2491 | cBlocksMoved++;
|
---|
2492 | }
|
---|
2493 |
|
---|
2494 | rc = vdIfProgress(pIfProgress, (uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
|
---|
2495 | }
|
---|
2496 | }
|
---|
2497 |
|
---|
2498 | /* Write the new BAT in any case. */
|
---|
2499 | rc = vhdFlushImage(pImage);
|
---|
2500 | } while (0);
|
---|
2501 |
|
---|
2502 | if (paBlocks)
|
---|
2503 | RTMemTmpFree(paBlocks);
|
---|
2504 | if (pvParent)
|
---|
2505 | RTMemTmpFree(pvParent);
|
---|
2506 | if (pvBuf)
|
---|
2507 | RTMemTmpFree(pvBuf);
|
---|
2508 |
|
---|
2509 | if (RT_SUCCESS(rc))
|
---|
2510 | vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
|
---|
2511 |
|
---|
2512 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2513 | return rc;
|
---|
2514 | }
|
---|
2515 |
|
---|
2516 | /** @interface_method_impl{VDIMAGEBACKEND,pfnResize} */
|
---|
2517 | static DECLCALLBACK(int) vhdResize(void *pBackendData, uint64_t cbSize,
|
---|
2518 | PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
|
---|
2519 | unsigned uPercentStart, unsigned uPercentSpan,
|
---|
2520 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
---|
2521 | PVDINTERFACE pVDIfsOperation)
|
---|
2522 | {
|
---|
2523 | RT_NOREF5(uPercentSpan, uPercentStart, pVDIfsDisk, pVDIfsImage, pVDIfsOperation);
|
---|
2524 | PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
|
---|
2525 | int rc = VINF_SUCCESS;
|
---|
2526 |
|
---|
2527 | /* Making the image smaller is not supported at the moment. */
|
---|
2528 | if ( cbSize < pImage->cbSize
|
---|
2529 | || pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
|
---|
2530 | rc = VERR_NOT_SUPPORTED;
|
---|
2531 | else if (cbSize > pImage->cbSize)
|
---|
2532 | {
|
---|
2533 | unsigned cBlocksAllocated = 0;
|
---|
2534 | size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of a block including the sector bitmap. */
|
---|
2535 | uint32_t cBlocksNew = cbSize / pImage->cbDataBlock; /** < New number of blocks in the image after the resize */
|
---|
2536 | if (cbSize % pImage->cbDataBlock)
|
---|
2537 | cBlocksNew++;
|
---|
2538 |
|
---|
2539 | uint32_t cBlocksOld = pImage->cBlockAllocationTableEntries; /** < Number of blocks before the resize. */
|
---|
2540 | uint64_t cbBlockspaceNew = RT_ALIGN_32(cBlocksNew * sizeof(uint32_t), VHD_SECTOR_SIZE); /** < Required space for the block array after the resize. */
|
---|
2541 | uint64_t offStartDataNew = RT_ALIGN_32(pImage->uBlockAllocationTableOffset + cbBlockspaceNew, VHD_SECTOR_SIZE); /** < New start offset for block data after the resize */
|
---|
2542 | uint64_t offStartDataOld = ~0ULL;
|
---|
2543 |
|
---|
2544 | /* Go through the BAT and find the data start offset. */
|
---|
2545 | for (unsigned idxBlock = 0; idxBlock < pImage->cBlockAllocationTableEntries; idxBlock++)
|
---|
2546 | {
|
---|
2547 | if (pImage->pBlockAllocationTable[idxBlock] != ~0U)
|
---|
2548 | {
|
---|
2549 | uint64_t offStartBlock = (uint64_t)pImage->pBlockAllocationTable[idxBlock] * VHD_SECTOR_SIZE;
|
---|
2550 | if (offStartBlock < offStartDataOld)
|
---|
2551 | offStartDataOld = offStartBlock;
|
---|
2552 | cBlocksAllocated++;
|
---|
2553 | }
|
---|
2554 | }
|
---|
2555 |
|
---|
2556 | if ( offStartDataOld != offStartDataNew
|
---|
2557 | && cBlocksAllocated > 0)
|
---|
2558 | {
|
---|
2559 | /* Calculate how many sectors nee to be relocated. */
|
---|
2560 | uint64_t cbOverlapping = offStartDataNew - offStartDataOld;
|
---|
2561 | unsigned cBlocksReloc = (unsigned)(cbOverlapping / cbBlock);
|
---|
2562 | if (cbOverlapping % cbBlock)
|
---|
2563 | cBlocksReloc++;
|
---|
2564 |
|
---|
2565 | cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
|
---|
2566 | offStartDataNew = offStartDataOld;
|
---|
2567 |
|
---|
2568 | /* Do the relocation. */
|
---|
2569 | LogFlow(("Relocating %u blocks\n", cBlocksReloc));
|
---|
2570 |
|
---|
2571 | /*
|
---|
2572 | * Get the blocks we need to relocate first, they are appended to the end
|
---|
2573 | * of the image.
|
---|
2574 | */
|
---|
2575 | void *pvBuf = NULL, *pvZero = NULL;
|
---|
2576 | do
|
---|
2577 | {
|
---|
2578 | /* Allocate data buffer. */
|
---|
2579 | pvBuf = RTMemAllocZ(cbBlock);
|
---|
2580 | if (!pvBuf)
|
---|
2581 | {
|
---|
2582 | rc = VERR_NO_MEMORY;
|
---|
2583 | break;
|
---|
2584 | }
|
---|
2585 |
|
---|
2586 | /* Allocate buffer for overwriting with zeroes. */
|
---|
2587 | pvZero = RTMemAllocZ(cbBlock);
|
---|
2588 | if (!pvZero)
|
---|
2589 | {
|
---|
2590 | rc = VERR_NO_MEMORY;
|
---|
2591 | break;
|
---|
2592 | }
|
---|
2593 |
|
---|
2594 | for (unsigned i = 0; i < cBlocksReloc; i++)
|
---|
2595 | {
|
---|
2596 | uint32_t uBlock = offStartDataNew / VHD_SECTOR_SIZE;
|
---|
2597 |
|
---|
2598 | /* Search the index in the block table. */
|
---|
2599 | for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
|
---|
2600 | {
|
---|
2601 | if (pImage->pBlockAllocationTable[idxBlock] == uBlock)
|
---|
2602 | {
|
---|
2603 | /* Read data and append to the end of the image. */
|
---|
2604 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
2605 | offStartDataNew, pvBuf, cbBlock);
|
---|
2606 | if (RT_FAILURE(rc))
|
---|
2607 | break;
|
---|
2608 |
|
---|
2609 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
2610 | pImage->uCurrentEndOfFile, pvBuf, cbBlock);
|
---|
2611 | if (RT_FAILURE(rc))
|
---|
2612 | break;
|
---|
2613 |
|
---|
2614 | /* Zero out the old block area. */
|
---|
2615 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
2616 | offStartDataNew, pvZero, cbBlock);
|
---|
2617 | if (RT_FAILURE(rc))
|
---|
2618 | break;
|
---|
2619 |
|
---|
2620 | /* Update block counter. */
|
---|
2621 | pImage->pBlockAllocationTable[idxBlock] = pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE;
|
---|
2622 |
|
---|
2623 | pImage->uCurrentEndOfFile += cbBlock;
|
---|
2624 |
|
---|
2625 | /* Continue with the next block. */
|
---|
2626 | break;
|
---|
2627 | }
|
---|
2628 | }
|
---|
2629 |
|
---|
2630 | if (RT_FAILURE(rc))
|
---|
2631 | break;
|
---|
2632 |
|
---|
2633 | offStartDataNew += cbBlock;
|
---|
2634 | }
|
---|
2635 | } while (0);
|
---|
2636 |
|
---|
2637 | if (pvBuf)
|
---|
2638 | RTMemFree(pvBuf);
|
---|
2639 | if (pvZero)
|
---|
2640 | RTMemFree(pvZero);
|
---|
2641 | }
|
---|
2642 |
|
---|
2643 | /*
|
---|
2644 | * Relocation done, expand the block array and update the header with
|
---|
2645 | * the new data.
|
---|
2646 | */
|
---|
2647 | if (RT_SUCCESS(rc))
|
---|
2648 | {
|
---|
2649 | uint32_t *paBlocksNew = (uint32_t *)RTMemRealloc(pImage->pBlockAllocationTable, cBlocksNew * sizeof(uint32_t));
|
---|
2650 | if (paBlocksNew)
|
---|
2651 | {
|
---|
2652 | pImage->pBlockAllocationTable = paBlocksNew;
|
---|
2653 |
|
---|
2654 | /* Mark the new blocks as unallocated. */
|
---|
2655 | for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
|
---|
2656 | pImage->pBlockAllocationTable[idxBlock] = ~0U;
|
---|
2657 | }
|
---|
2658 | else
|
---|
2659 | rc = VERR_NO_MEMORY;
|
---|
2660 |
|
---|
2661 | if (RT_SUCCESS(rc))
|
---|
2662 | {
|
---|
2663 | /* Write the block array before updating the rest. */
|
---|
2664 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
2665 | pImage->uBlockAllocationTableOffset,
|
---|
2666 | pImage->pBlockAllocationTable,
|
---|
2667 | cBlocksNew * sizeof(uint32_t));
|
---|
2668 | }
|
---|
2669 |
|
---|
2670 | if (RT_SUCCESS(rc))
|
---|
2671 | {
|
---|
2672 | /* Update size and new block count. */
|
---|
2673 | pImage->cBlockAllocationTableEntries = cBlocksNew;
|
---|
2674 | pImage->cbSize = cbSize;
|
---|
2675 |
|
---|
2676 | /* Update geometry. */
|
---|
2677 | pImage->PCHSGeometry = *pPCHSGeometry;
|
---|
2678 | pImage->LCHSGeometry = *pLCHSGeometry;
|
---|
2679 | }
|
---|
2680 | }
|
---|
2681 |
|
---|
2682 | /* Update header information in base image file. */
|
---|
2683 | pImage->fDynHdrNeedsUpdate = true;
|
---|
2684 | vhdFlushImage(pImage);
|
---|
2685 | }
|
---|
2686 | /* Same size doesn't change the image at all. */
|
---|
2687 |
|
---|
2688 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2689 | return rc;
|
---|
2690 | }
|
---|
2691 |
|
---|
2692 | /** @interface_method_impl{VDIMAGEBACKEND,pfnRepair} */
|
---|
2693 | static DECLCALLBACK(int) vhdRepair(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
|
---|
2694 | PVDINTERFACE pVDIfsImage, uint32_t fFlags)
|
---|
2695 | {
|
---|
2696 | LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
|
---|
2697 | int rc;
|
---|
2698 | PVDINTERFACEERROR pIfError;
|
---|
2699 | PVDINTERFACEIOINT pIfIo;
|
---|
2700 | PVDIOSTORAGE pStorage;
|
---|
2701 | uint64_t cbFile;
|
---|
2702 | VHDFooter vhdFooter;
|
---|
2703 | VHDDynamicDiskHeader dynamicDiskHeader;
|
---|
2704 | uint32_t *paBat = NULL;
|
---|
2705 | uint32_t *pu32BlockBitmap = NULL;
|
---|
2706 |
|
---|
2707 | pIfIo = VDIfIoIntGet(pVDIfsImage);
|
---|
2708 | AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
|
---|
2709 |
|
---|
2710 | pIfError = VDIfErrorGet(pVDIfsDisk);
|
---|
2711 |
|
---|
2712 | do
|
---|
2713 | {
|
---|
2714 | uint64_t offDynamicDiskHeader = 0;
|
---|
2715 | uint64_t offBat = 0;
|
---|
2716 | uint64_t offFooter = 0;
|
---|
2717 | uint32_t cBatEntries = 0;
|
---|
2718 | bool fDynamic = false;
|
---|
2719 | bool fRepairFooter = false;
|
---|
2720 | bool fRepairBat = false;
|
---|
2721 | bool fRepairDynHeader = false;
|
---|
2722 |
|
---|
2723 | rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
|
---|
2724 | VDOpenFlagsToFileOpenFlags( fFlags & VD_REPAIR_DRY_RUN
|
---|
2725 | ? VD_OPEN_FLAGS_READONLY
|
---|
2726 | : 0,
|
---|
2727 | false /* fCreate */),
|
---|
2728 | &pStorage);
|
---|
2729 | if (RT_FAILURE(rc))
|
---|
2730 | {
|
---|
2731 | rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to open image \"%s\"", pszFilename);
|
---|
2732 | break;
|
---|
2733 | }
|
---|
2734 |
|
---|
2735 | rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
|
---|
2736 | if (RT_FAILURE(rc))
|
---|
2737 | {
|
---|
2738 | rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to query image size");
|
---|
2739 | break;
|
---|
2740 | }
|
---|
2741 |
|
---|
2742 | if (cbFile < sizeof(VHDFooter))
|
---|
2743 | {
|
---|
2744 | rc = vdIfError(pIfError, VERR_VD_INVALID_SIZE, RT_SRC_POS,
|
---|
2745 | "Image must be at least %u bytes (got %llu)",
|
---|
2746 | sizeof(VHDFooter), cbFile);
|
---|
2747 | break;
|
---|
2748 | }
|
---|
2749 |
|
---|
2750 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
|
---|
2751 | &vhdFooter, sizeof(VHDFooter));
|
---|
2752 | if (RT_FAILURE(rc))
|
---|
2753 | {
|
---|
2754 | rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read footer of image");
|
---|
2755 | break;
|
---|
2756 | }
|
---|
2757 |
|
---|
2758 | if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
|
---|
2759 | {
|
---|
2760 | /* Dynamic images have a backup at the beginning of the image. */
|
---|
2761 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0,
|
---|
2762 | &vhdFooter, sizeof(VHDFooter));
|
---|
2763 | if (RT_FAILURE(rc))
|
---|
2764 | {
|
---|
2765 | rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read header of image");
|
---|
2766 | break;
|
---|
2767 | }
|
---|
2768 |
|
---|
2769 | /*
|
---|
2770 | * Check for the header, if this fails the image is either completely corrupted
|
---|
2771 | * and impossible to repair or in another format.
|
---|
2772 | */
|
---|
2773 | if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
|
---|
2774 | {
|
---|
2775 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2776 | "No valid VHD structures found");
|
---|
2777 | break;
|
---|
2778 | }
|
---|
2779 | else
|
---|
2780 | vdIfErrorMessage(pIfError, "Missing footer structure, using backup\n");
|
---|
2781 |
|
---|
2782 | /* Remember to fix the footer structure. */
|
---|
2783 | fRepairFooter = true;
|
---|
2784 | }
|
---|
2785 |
|
---|
2786 | offFooter = cbFile - sizeof(VHDFooter);
|
---|
2787 |
|
---|
2788 | /* Verify that checksums match. */
|
---|
2789 | uint32_t u32ChkSumOld = RT_BE2H_U32(vhdFooter.Checksum);
|
---|
2790 | vhdFooter.Checksum = 0;
|
---|
2791 | uint32_t u32ChkSum = vhdChecksum(&vhdFooter, sizeof(VHDFooter));
|
---|
2792 |
|
---|
2793 | vhdFooter.Checksum = RT_H2BE_U32(u32ChkSum);
|
---|
2794 |
|
---|
2795 | if (u32ChkSumOld != u32ChkSum)
|
---|
2796 | {
|
---|
2797 | vdIfErrorMessage(pIfError, "Checksum is invalid (should be %u got %u), repairing\n",
|
---|
2798 | u32ChkSum, u32ChkSumOld);
|
---|
2799 | fRepairFooter = true;
|
---|
2800 | break;
|
---|
2801 | }
|
---|
2802 |
|
---|
2803 | switch (RT_BE2H_U32(vhdFooter.DiskType))
|
---|
2804 | {
|
---|
2805 | case VHD_FOOTER_DISK_TYPE_FIXED:
|
---|
2806 | fDynamic = false;
|
---|
2807 | break;
|
---|
2808 | case VHD_FOOTER_DISK_TYPE_DYNAMIC:
|
---|
2809 | fDynamic = true;
|
---|
2810 | break;
|
---|
2811 | case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
|
---|
2812 | fDynamic = true;
|
---|
2813 | break;
|
---|
2814 | default:
|
---|
2815 | {
|
---|
2816 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2817 | "VHD image type %u is not supported",
|
---|
2818 | RT_BE2H_U32(vhdFooter.DiskType));
|
---|
2819 | break;
|
---|
2820 | }
|
---|
2821 | }
|
---|
2822 |
|
---|
2823 | /* Load and check dynamic disk header if required. */
|
---|
2824 | if (fDynamic)
|
---|
2825 | {
|
---|
2826 | size_t cbBlock;
|
---|
2827 |
|
---|
2828 | offDynamicDiskHeader = RT_BE2H_U64(vhdFooter.DataOffset);
|
---|
2829 | if (offDynamicDiskHeader + sizeof(VHDDynamicDiskHeader) > cbFile)
|
---|
2830 | {
|
---|
2831 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2832 | "VHD image type is not supported");
|
---|
2833 | break;
|
---|
2834 | }
|
---|
2835 |
|
---|
2836 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offDynamicDiskHeader,
|
---|
2837 | &dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
|
---|
2838 | if (RT_FAILURE(rc))
|
---|
2839 | {
|
---|
2840 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2841 | "Failed to read dynamic disk header (at %llu), %Rrc",
|
---|
2842 | offDynamicDiskHeader, rc);
|
---|
2843 | break;
|
---|
2844 | }
|
---|
2845 |
|
---|
2846 | /* Verify that checksums match. */
|
---|
2847 | u32ChkSumOld = RT_BE2H_U32(dynamicDiskHeader.Checksum);
|
---|
2848 | dynamicDiskHeader.Checksum = 0;
|
---|
2849 | u32ChkSum = vhdChecksum(&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
|
---|
2850 |
|
---|
2851 | dynamicDiskHeader.Checksum = RT_H2BE_U32(u32ChkSum);
|
---|
2852 |
|
---|
2853 | if (u32ChkSumOld != u32ChkSum)
|
---|
2854 | {
|
---|
2855 | vdIfErrorMessage(pIfError, "Checksum of dynamic disk header is invalid (should be %u got %u), repairing\n",
|
---|
2856 | u32ChkSum, u32ChkSumOld);
|
---|
2857 | fRepairDynHeader = true;
|
---|
2858 | break;
|
---|
2859 | }
|
---|
2860 |
|
---|
2861 | /* Read the block allocation table and fix any inconsistencies. */
|
---|
2862 | offBat = RT_BE2H_U64(dynamicDiskHeader.TableOffset);
|
---|
2863 | cBatEntries = RT_BE2H_U32(dynamicDiskHeader.MaxTableEntries);
|
---|
2864 | cbBlock = RT_BE2H_U32(dynamicDiskHeader.BlockSize);
|
---|
2865 | cbBlock += cbBlock / VHD_SECTOR_SIZE / 8;
|
---|
2866 |
|
---|
2867 | if (offBat + cBatEntries * sizeof(uint32_t) > cbFile)
|
---|
2868 | {
|
---|
2869 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2870 | "Block allocation table is not inside the image");
|
---|
2871 | break;
|
---|
2872 | }
|
---|
2873 |
|
---|
2874 | paBat = (uint32_t *)RTMemAllocZ(cBatEntries * sizeof(uint32_t));
|
---|
2875 | if (!paBat)
|
---|
2876 | {
|
---|
2877 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2878 | "Could not allocate memory for the block allocation table (%u bytes)",
|
---|
2879 | cBatEntries * sizeof(uint32_t));
|
---|
2880 | break;
|
---|
2881 | }
|
---|
2882 |
|
---|
2883 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offBat, paBat,
|
---|
2884 | cBatEntries * sizeof(uint32_t));
|
---|
2885 | if (RT_FAILURE(rc))
|
---|
2886 | {
|
---|
2887 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2888 | "Could not read block allocation table (at %llu), %Rrc",
|
---|
2889 | offBat, rc);
|
---|
2890 | break;
|
---|
2891 | }
|
---|
2892 |
|
---|
2893 | pu32BlockBitmap = (uint32_t *)RTMemAllocZ(RT_ALIGN_Z(cBatEntries / 8, 4));
|
---|
2894 | if (!pu32BlockBitmap)
|
---|
2895 | {
|
---|
2896 | rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS,
|
---|
2897 | "Failed to allocate memory for block bitmap");
|
---|
2898 | break;
|
---|
2899 | }
|
---|
2900 |
|
---|
2901 | uint32_t idxMinBlock = UINT32_C(0xffffffff);
|
---|
2902 | for (uint32_t i = 0; i < cBatEntries; i++)
|
---|
2903 | {
|
---|
2904 | paBat[i] = RT_BE2H_U32(paBat[i]);
|
---|
2905 | if (paBat[i] < idxMinBlock)
|
---|
2906 | idxMinBlock = paBat[i];
|
---|
2907 | }
|
---|
2908 |
|
---|
2909 | vdIfErrorMessage(pIfError, "First data block at sector %u\n", idxMinBlock);
|
---|
2910 |
|
---|
2911 | for (uint32_t i = 0; i < cBatEntries; i++)
|
---|
2912 | {
|
---|
2913 | if (paBat[i] != UINT32_C(0xffffffff))
|
---|
2914 | {
|
---|
2915 | uint64_t offBlock =(uint64_t)paBat[i] * VHD_SECTOR_SIZE;
|
---|
2916 |
|
---|
2917 | /*
|
---|
2918 | * Check that the offsets are valid (inside of the image) and
|
---|
2919 | * that there are no double references.
|
---|
2920 | */
|
---|
2921 | if (offBlock + cbBlock > cbFile)
|
---|
2922 | {
|
---|
2923 | vdIfErrorMessage(pIfError, "Entry %u points to invalid offset %llu, clearing\n",
|
---|
2924 | i, offBlock);
|
---|
2925 | paBat[i] = UINT32_C(0xffffffff);
|
---|
2926 | fRepairBat = true;
|
---|
2927 | }
|
---|
2928 | else if (offBlock + cbBlock > offFooter)
|
---|
2929 | {
|
---|
2930 | vdIfErrorMessage(pIfError, "Entry %u intersects with footer, aligning footer\n",
|
---|
2931 | i);
|
---|
2932 | offFooter = offBlock + cbBlock;
|
---|
2933 | fRepairBat = true;
|
---|
2934 | }
|
---|
2935 |
|
---|
2936 | if ( paBat[i] != UINT32_C(0xffffffff)
|
---|
2937 | && ASMBitTestAndSet(pu32BlockBitmap, (uint32_t)((paBat[i] - idxMinBlock) / (cbBlock / VHD_SECTOR_SIZE))))
|
---|
2938 | {
|
---|
2939 | vdIfErrorMessage(pIfError, "Entry %u points to an already referenced data block, clearing\n",
|
---|
2940 | i);
|
---|
2941 | paBat[i] = UINT32_C(0xffffffff);
|
---|
2942 | fRepairBat = true;
|
---|
2943 | }
|
---|
2944 | }
|
---|
2945 | }
|
---|
2946 | }
|
---|
2947 |
|
---|
2948 | /* Write repaired structures now. */
|
---|
2949 | if (!(fRepairBat || fRepairDynHeader || fRepairFooter))
|
---|
2950 | vdIfErrorMessage(pIfError, "VHD image is in a consistent state, no repair required\n");
|
---|
2951 | else if (!(fFlags & VD_REPAIR_DRY_RUN))
|
---|
2952 | {
|
---|
2953 | if (fRepairBat)
|
---|
2954 | {
|
---|
2955 | for (uint32_t i = 0; i < cBatEntries; i++)
|
---|
2956 | paBat[i] = RT_H2BE_U32(paBat[i]);
|
---|
2957 |
|
---|
2958 | vdIfErrorMessage(pIfError, "Writing repaired block allocation table...\n");
|
---|
2959 |
|
---|
2960 | rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offBat, paBat,
|
---|
2961 | cBatEntries * sizeof(uint32_t));
|
---|
2962 | if (RT_FAILURE(rc))
|
---|
2963 | {
|
---|
2964 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2965 | "Could not write repaired block allocation table (at %llu), %Rrc",
|
---|
2966 | offBat, rc);
|
---|
2967 | break;
|
---|
2968 | }
|
---|
2969 | }
|
---|
2970 |
|
---|
2971 | if (fRepairDynHeader)
|
---|
2972 | {
|
---|
2973 | Assert(fDynamic);
|
---|
2974 |
|
---|
2975 | vdIfErrorMessage(pIfError, "Writing repaired dynamic disk header...\n");
|
---|
2976 | rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offDynamicDiskHeader, &dynamicDiskHeader,
|
---|
2977 | sizeof(VHDDynamicDiskHeader));
|
---|
2978 | if (RT_FAILURE(rc))
|
---|
2979 | {
|
---|
2980 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2981 | "Could not write repaired dynamic disk header (at %llu), %Rrc",
|
---|
2982 | offDynamicDiskHeader, rc);
|
---|
2983 | break;
|
---|
2984 | }
|
---|
2985 | }
|
---|
2986 |
|
---|
2987 | if (fRepairFooter)
|
---|
2988 | {
|
---|
2989 | vdIfErrorMessage(pIfError, "Writing repaired Footer...\n");
|
---|
2990 |
|
---|
2991 | if (fDynamic)
|
---|
2992 | {
|
---|
2993 | /* Write backup at image beginning. */
|
---|
2994 | rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, 0, &vhdFooter,
|
---|
2995 | sizeof(VHDFooter));
|
---|
2996 | if (RT_FAILURE(rc))
|
---|
2997 | {
|
---|
2998 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
2999 | "Could not write repaired backup footer (at %llu), %Rrc",
|
---|
3000 | 0, rc);
|
---|
3001 | break;
|
---|
3002 | }
|
---|
3003 | }
|
---|
3004 |
|
---|
3005 | rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offFooter, &vhdFooter,
|
---|
3006 | sizeof(VHDFooter));
|
---|
3007 | if (RT_FAILURE(rc))
|
---|
3008 | {
|
---|
3009 | rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
|
---|
3010 | "Could not write repaired footer (at %llu), %Rrc",
|
---|
3011 | cbFile - sizeof(VHDFooter), rc);
|
---|
3012 | break;
|
---|
3013 | }
|
---|
3014 | }
|
---|
3015 |
|
---|
3016 | vdIfErrorMessage(pIfError, "Corrupted VHD image repaired successfully\n");
|
---|
3017 | }
|
---|
3018 | } while(0);
|
---|
3019 |
|
---|
3020 | if (paBat)
|
---|
3021 | RTMemFree(paBat);
|
---|
3022 |
|
---|
3023 | if (pu32BlockBitmap)
|
---|
3024 | RTMemFree(pu32BlockBitmap);
|
---|
3025 |
|
---|
3026 | if (pStorage)
|
---|
3027 | {
|
---|
3028 | int rc2 = vdIfIoIntFileClose(pIfIo, pStorage);
|
---|
3029 | if (RT_SUCCESS(rc))
|
---|
3030 | rc = rc2; /* Propagate status code only when repairing the image was successful. */
|
---|
3031 | }
|
---|
3032 |
|
---|
3033 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
3034 | return rc;
|
---|
3035 | }
|
---|
3036 |
|
---|
3037 |
|
---|
3038 | const VDIMAGEBACKEND g_VhdBackend =
|
---|
3039 | {
|
---|
3040 | /* u32Version */
|
---|
3041 | VD_IMGBACKEND_VERSION,
|
---|
3042 | /* pszBackendName */
|
---|
3043 | "VHD",
|
---|
3044 | /* uBackendCaps */
|
---|
3045 | VD_CAP_UUID | VD_CAP_DIFF | VD_CAP_FILE |
|
---|
3046 | VD_CAP_CREATE_FIXED | VD_CAP_CREATE_DYNAMIC |
|
---|
3047 | VD_CAP_ASYNC | VD_CAP_VFS | VD_CAP_PREFERRED,
|
---|
3048 | /* paFileExtensions */
|
---|
3049 | s_aVhdFileExtensions,
|
---|
3050 | /* paConfigInfo */
|
---|
3051 | NULL,
|
---|
3052 | /* pfnProbe */
|
---|
3053 | vhdProbe,
|
---|
3054 | /* pfnOpen */
|
---|
3055 | vhdOpen,
|
---|
3056 | /* pfnCreate */
|
---|
3057 | vhdCreate,
|
---|
3058 | /* pfnRename */
|
---|
3059 | vhdRename,
|
---|
3060 | /* pfnClose */
|
---|
3061 | vhdClose,
|
---|
3062 | /* pfnRead */
|
---|
3063 | vhdRead,
|
---|
3064 | /* pfnWrite */
|
---|
3065 | vhdWrite,
|
---|
3066 | /* pfnFlush */
|
---|
3067 | vhdFlush,
|
---|
3068 | /* pfnDiscard */
|
---|
3069 | NULL,
|
---|
3070 | /* pfnGetVersion */
|
---|
3071 | vhdGetVersion,
|
---|
3072 | /* pfnGetFileSize */
|
---|
3073 | vhdGetFileSize,
|
---|
3074 | /* pfnGetPCHSGeometry */
|
---|
3075 | vhdGetPCHSGeometry,
|
---|
3076 | /* pfnSetPCHSGeometry */
|
---|
3077 | vhdSetPCHSGeometry,
|
---|
3078 | /* pfnGetLCHSGeometry */
|
---|
3079 | vhdGetLCHSGeometry,
|
---|
3080 | /* pfnSetLCHSGeometry */
|
---|
3081 | vhdSetLCHSGeometry,
|
---|
3082 | /* pfnQueryRegions */
|
---|
3083 | vhdQueryRegions,
|
---|
3084 | /* pfnRegionListRelease */
|
---|
3085 | vhdRegionListRelease,
|
---|
3086 | /* pfnGetImageFlags */
|
---|
3087 | vhdGetImageFlags,
|
---|
3088 | /* pfnGetOpenFlags */
|
---|
3089 | vhdGetOpenFlags,
|
---|
3090 | /* pfnSetOpenFlags */
|
---|
3091 | vhdSetOpenFlags,
|
---|
3092 | /* pfnGetComment */
|
---|
3093 | vhdGetComment,
|
---|
3094 | /* pfnSetComment */
|
---|
3095 | vhdSetComment,
|
---|
3096 | /* pfnGetUuid */
|
---|
3097 | vhdGetUuid,
|
---|
3098 | /* pfnSetUuid */
|
---|
3099 | vhdSetUuid,
|
---|
3100 | /* pfnGetModificationUuid */
|
---|
3101 | vhdGetModificationUuid,
|
---|
3102 | /* pfnSetModificationUuid */
|
---|
3103 | vhdSetModificationUuid,
|
---|
3104 | /* pfnGetParentUuid */
|
---|
3105 | vhdGetParentUuid,
|
---|
3106 | /* pfnSetParentUuid */
|
---|
3107 | vhdSetParentUuid,
|
---|
3108 | /* pfnGetParentModificationUuid */
|
---|
3109 | vhdGetParentModificationUuid,
|
---|
3110 | /* pfnSetParentModificationUuid */
|
---|
3111 | vhdSetParentModificationUuid,
|
---|
3112 | /* pfnDump */
|
---|
3113 | vhdDump,
|
---|
3114 | /* pfnGetTimestamp */
|
---|
3115 | vhdGetTimestamp,
|
---|
3116 | /* pfnGetParentTimestamp */
|
---|
3117 | vhdGetParentTimestamp,
|
---|
3118 | /* pfnSetParentTimestamp */
|
---|
3119 | vhdSetParentTimestamp,
|
---|
3120 | /* pfnGetParentFilename */
|
---|
3121 | vhdGetParentFilename,
|
---|
3122 | /* pfnSetParentFilename */
|
---|
3123 | vhdSetParentFilename,
|
---|
3124 | /* pfnComposeLocation */
|
---|
3125 | genericFileComposeLocation,
|
---|
3126 | /* pfnComposeName */
|
---|
3127 | genericFileComposeName,
|
---|
3128 | /* pfnCompact */
|
---|
3129 | vhdCompact,
|
---|
3130 | /* pfnResize */
|
---|
3131 | vhdResize,
|
---|
3132 | /* pfnRepair */
|
---|
3133 | vhdRepair,
|
---|
3134 | /* pfnTraverseMetadata */
|
---|
3135 | NULL,
|
---|
3136 | /* u32VersionEnd */
|
---|
3137 | VD_IMGBACKEND_VERSION
|
---|
3138 | };
|
---|