1 | /* $Id: QCOW.cpp 66486 2017-04-10 07:23:59Z vboxsync $ */
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2 | /** @file
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3 | * QCOW - QCOW Disk image.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2011-2016 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_QCOW
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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 <iprt/asm.h>
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28 | #include <iprt/assert.h>
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29 | #include <iprt/string.h>
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30 | #include <iprt/alloc.h>
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31 | #include <iprt/path.h>
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32 | #include <iprt/list.h>
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33 |
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34 | #include "VDBackends.h"
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35 |
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36 | /** @page pg_storage_qcow QCOW Storage Backend
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37 | * The QCOW backend implements support for the qemu copy on write format (short QCOW).
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38 | * There is no official specification available but the format is described
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39 | * at http://people.gnome.org/~markmc/qcow-image-format.html for version 2
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40 | * and http://people.gnome.org/~markmc/qcow-image-format-version-1.html for version 1.
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41 | *
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42 | * Missing things to implement:
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43 | * - v2 image creation and handling of the reference count table. (Blocker to enable support for V2 images)
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44 | * - cluster encryption
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45 | * - cluster compression
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46 | * - compaction
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47 | * - resizing
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48 | */
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49 |
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50 |
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51 | /*********************************************************************************************************************************
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52 | * Structures in a QCOW image, big endian *
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53 | *********************************************************************************************************************************/
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54 |
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55 | #pragma pack(1) /* Completely unnecessary. */
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56 | typedef struct QCowHeader
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57 | {
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58 | /** Magic value. */
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59 | uint32_t u32Magic;
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60 | /** Version of the image. */
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61 | uint32_t u32Version;
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62 | /** Version dependent data. */
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63 | union
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64 | {
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65 | /** Version 1. */
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66 | struct
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67 | {
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68 | /** Backing file offset. */
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69 | uint64_t u64BackingFileOffset;
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70 | /** Size of the backing file. */
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71 | uint32_t u32BackingFileSize;
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72 | /** mtime (Modification time?) - can be ignored. */
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73 | uint32_t u32MTime;
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74 | /** Logical size of the image in bytes. */
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75 | uint64_t u64Size;
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76 | /** Number of bits in the virtual offset used as a cluster offset. */
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77 | uint8_t u8ClusterBits;
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78 | /** Number of bits in the virtual offset used for the L2 index. */
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79 | uint8_t u8L2Bits;
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80 | /** Padding because the header is not packed in the original source. */
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81 | uint16_t u16Padding;
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82 | /** Used cryptographic method. */
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83 | uint32_t u32CryptMethod;
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84 | /** Offset of the L1 table in the image in bytes. */
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85 | uint64_t u64L1TableOffset;
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86 | } v1;
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87 | /** Version 2. */
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88 | struct
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89 | {
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90 | /** Backing file offset. */
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91 | uint64_t u64BackingFileOffset;
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92 | /** Size of the backing file. */
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93 | uint32_t u32BackingFileSize;
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94 | /** Number of bits in the virtual offset used as a cluster offset. */
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95 | uint32_t u32ClusterBits;
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96 | /** Logical size of the image. */
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97 | uint64_t u64Size;
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98 | /** Used cryptographic method. */
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99 | uint32_t u32CryptMethod;
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100 | /** Size of the L1 table in entries (each 8bytes big). */
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101 | uint32_t u32L1Size;
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102 | /** Offset of the L1 table in the image in bytes. */
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103 | uint64_t u64L1TableOffset;
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104 | /** Start of the refcount table in the image. */
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105 | uint64_t u64RefcountTableOffset;
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106 | /** Size of the refcount table in clusters. */
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107 | uint32_t u32RefcountTableClusters;
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108 | /** Number of snapshots in the image. */
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109 | uint32_t u32NbSnapshots;
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110 | /** Offset of the first snapshot header in the image. */
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111 | uint64_t u64SnapshotsOffset;
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112 | } v2;
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113 | } Version;
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114 | } QCowHeader;
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115 | #pragma pack()
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116 | /** Pointer to a on disk QCOW header. */
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117 | typedef QCowHeader *PQCowHeader;
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118 |
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119 | /** QCOW magic value. */
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120 | #define QCOW_MAGIC UINT32_C(0x514649fb) /* QFI\0xfb */
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121 | /** Size of the V1 header. */
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122 | #define QCOW_V1_HDR_SIZE (48)
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123 | /** Size of the V2 header. */
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124 | #define QCOW_V2_HDR_SIZE (72)
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125 |
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126 | /** Cluster is compressed flag for QCOW images. */
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127 | #define QCOW_V1_COMPRESSED_FLAG RT_BIT_64(63)
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128 |
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129 | /** Copied flag for QCOW2 images. */
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130 | #define QCOW_V2_COPIED_FLAG RT_BIT_64(63)
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131 | /** Cluster is compressed flag for QCOW2 images. */
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132 | #define QCOW_V2_COMPRESSED_FLAG RT_BIT_64(62)
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133 |
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134 |
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135 | /*********************************************************************************************************************************
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136 | * Constants And Macros, Structures and Typedefs *
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137 | *********************************************************************************************************************************/
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138 |
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139 | /**
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140 | * QCOW L2 cache entry.
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141 | */
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142 | typedef struct QCOWL2CACHEENTRY
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143 | {
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144 | /** List node for the search list. */
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145 | RTLISTNODE NodeSearch;
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146 | /** List node for the LRU list. */
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147 | RTLISTNODE NodeLru;
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148 | /** Reference counter. */
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149 | uint32_t cRefs;
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150 | /** The offset of the L2 table, used as search key. */
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151 | uint64_t offL2Tbl;
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152 | /** Pointer to the cached L2 table. */
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153 | uint64_t *paL2Tbl;
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154 | } QCOWL2CACHEENTRY, *PQCOWL2CACHEENTRY;
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155 |
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156 | /** Maximum amount of memory the cache is allowed to use. */
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157 | #define QCOW_L2_CACHE_MEMORY_MAX (2*_1M)
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158 |
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159 | /** QCOW default cluster size for image version 2. */
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160 | #define QCOW2_CLUSTER_SIZE_DEFAULT (64*_1K)
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161 | /** QCOW default cluster size for image version 1. */
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162 | #define QCOW_CLUSTER_SIZE_DEFAULT (4*_1K)
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163 | /** QCOW default L2 table size in clusters. */
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164 | #define QCOW_L2_CLUSTERS_DEFAULT (1)
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165 |
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166 | /**
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167 | * QCOW image data structure.
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168 | */
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169 | typedef struct QCOWIMAGE
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170 | {
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171 | /** Image name. */
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172 | const char *pszFilename;
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173 | /** Storage handle. */
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174 | PVDIOSTORAGE pStorage;
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175 |
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176 | /** Pointer to the per-disk VD interface list. */
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177 | PVDINTERFACE pVDIfsDisk;
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178 | /** Pointer to the per-image VD interface list. */
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179 | PVDINTERFACE pVDIfsImage;
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180 | /** Error interface. */
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181 | PVDINTERFACEERROR pIfError;
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182 | /** I/O interface. */
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183 | PVDINTERFACEIOINT pIfIo;
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184 |
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185 | /** Open flags passed by VBoxHD layer. */
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186 | unsigned uOpenFlags;
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187 | /** Image flags defined during creation or determined during open. */
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188 | unsigned uImageFlags;
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189 | /** Total size of the image. */
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190 | uint64_t cbSize;
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191 | /** Physical geometry of this image. */
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192 | VDGEOMETRY PCHSGeometry;
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193 | /** Logical geometry of this image. */
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194 | VDGEOMETRY LCHSGeometry;
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195 |
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196 | /** Image version. */
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197 | unsigned uVersion;
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198 | /** MTime field - used only to preserve value in opened images, unmodified otherwise. */
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199 | uint32_t MTime;
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200 |
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201 | /** Filename of the backing file if any. */
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202 | char *pszBackingFilename;
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203 | /** Offset of the filename in the image. */
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204 | uint64_t offBackingFilename;
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205 | /** Size of the backing filename excluding \0. */
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206 | uint32_t cbBackingFilename;
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207 |
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208 | /** Next offset of a new cluster, aligned to sector size. */
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209 | uint64_t offNextCluster;
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210 | /** Cluster size in bytes. */
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211 | uint32_t cbCluster;
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212 | /** Number of entries in the L1 table. */
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213 | uint32_t cL1TableEntries;
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214 | /** Size of an L1 rounded to the next cluster size. */
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215 | uint32_t cbL1Table;
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216 | /** Pointer to the L1 table. */
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217 | uint64_t *paL1Table;
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218 | /** Offset of the L1 table. */
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219 | uint64_t offL1Table;
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220 |
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221 | /** Size of the L2 table in bytes. */
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222 | uint32_t cbL2Table;
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223 | /** Number of entries in the L2 table. */
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224 | uint32_t cL2TableEntries;
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225 | /** Memory occupied by the L2 table cache. */
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226 | size_t cbL2Cache;
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227 | /** The sorted L2 entry list used for searching. */
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228 | RTLISTNODE ListSearch;
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229 | /** The LRU L2 entry list used for eviction. */
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230 | RTLISTNODE ListLru;
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231 |
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232 | /** Offset of the refcount table. */
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233 | uint64_t offRefcountTable;
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234 | /** Size of the refcount table in bytes. */
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235 | uint32_t cbRefcountTable;
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236 | /** Number of entries in the refcount table. */
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237 | uint32_t cRefcountTableEntries;
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238 | /** Pointer to the refcount table. */
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239 | uint64_t *paRefcountTable;
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240 |
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241 | /** Offset mask for a cluster. */
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242 | uint64_t fOffsetMask;
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243 | /** Number of bits to shift to get the L1 index. */
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244 | uint32_t cL1Shift;
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245 | /** L2 table mask to get the L2 index. */
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246 | uint64_t fL2Mask;
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247 | /** Number of bits to shift to get the L2 index. */
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248 | uint32_t cL2Shift;
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249 |
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250 | /** Pointer to the L2 table we are currently allocating
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251 | * (can be only one at a time). */
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252 | PQCOWL2CACHEENTRY pL2TblAlloc;
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253 | /** The static region list. */
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254 | VDREGIONLIST RegionList;
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255 | } QCOWIMAGE, *PQCOWIMAGE;
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256 |
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257 | /**
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258 | * State of the async cluster allocation.
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259 | */
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260 | typedef enum QCOWCLUSTERASYNCALLOCSTATE
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261 | {
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262 | /** Invalid. */
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263 | QCOWCLUSTERASYNCALLOCSTATE_INVALID = 0,
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264 | /** L2 table allocation. */
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265 | QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC,
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266 | /** Link L2 table into L1. */
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267 | QCOWCLUSTERASYNCALLOCSTATE_L2_LINK,
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268 | /** Allocate user data cluster. */
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269 | QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC,
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270 | /** Link user data cluster. */
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271 | QCOWCLUSTERASYNCALLOCSTATE_USER_LINK,
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272 | /** 32bit blowup. */
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273 | QCOWCLUSTERASYNCALLOCSTATE_32BIT_HACK = 0x7fffffff
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274 | } QCOWCLUSTERASYNCALLOCSTATE, *PQCOWCLUSTERASYNCALLOCSTATE;
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275 |
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276 | /**
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277 | * Data needed to track async cluster allocation.
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278 | */
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279 | typedef struct QCOWCLUSTERASYNCALLOC
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280 | {
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281 | /** The state of the cluster allocation. */
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282 | QCOWCLUSTERASYNCALLOCSTATE enmAllocState;
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283 | /** Old image size to rollback in case of an error. */
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284 | uint64_t offNextClusterOld;
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285 | /** L1 index to link if any. */
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286 | uint32_t idxL1;
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287 | /** L2 index to link, required in any case. */
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288 | uint32_t idxL2;
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289 | /** Start offset of the allocated cluster. */
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290 | uint64_t offClusterNew;
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291 | /** L2 cache entry if a L2 table is allocated. */
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292 | PQCOWL2CACHEENTRY pL2Entry;
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293 | /** Number of bytes to write. */
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294 | size_t cbToWrite;
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295 | } QCOWCLUSTERASYNCALLOC, *PQCOWCLUSTERASYNCALLOC;
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296 |
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297 |
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298 | /*********************************************************************************************************************************
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299 | * Static Variables *
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300 | *********************************************************************************************************************************/
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301 |
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302 | /** NULL-terminated array of supported file extensions. */
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303 | static const VDFILEEXTENSION s_aQCowFileExtensions[] =
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304 | {
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305 | {"qcow", VDTYPE_HDD},
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306 | {"qcow2", VDTYPE_HDD},
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307 | {NULL, VDTYPE_INVALID}
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308 | };
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309 |
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310 |
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311 | /*********************************************************************************************************************************
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312 | * Internal Functions *
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313 | *********************************************************************************************************************************/
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314 |
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315 | /**
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316 | * Return power of 2 or 0 if num error.
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317 | *
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318 | * @returns The power of 2 or 0 if the given number is not a power of 2.
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319 | * @param u32 The number.
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320 | */
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321 | static uint32_t qcowGetPowerOfTwo(uint32_t u32)
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322 | {
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323 | if (u32 == 0)
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324 | return 0;
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325 | uint32_t uPower2 = 0;
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326 | while ((u32 & 1) == 0)
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327 | {
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328 | u32 >>= 1;
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329 | uPower2++;
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330 | }
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331 | return u32 == 1 ? uPower2 : 0;
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332 | }
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333 |
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334 |
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335 | /**
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336 | * Converts the image header to the host endianess and performs basic checks.
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337 | *
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338 | * @returns Whether the given header is valid or not.
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339 | * @param pHeader Pointer to the header to convert.
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340 | */
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341 | static bool qcowHdrConvertToHostEndianess(PQCowHeader pHeader)
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342 | {
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343 | pHeader->u32Magic = RT_BE2H_U32(pHeader->u32Magic);
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344 | pHeader->u32Version = RT_BE2H_U32(pHeader->u32Version);
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345 |
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346 | if (pHeader->u32Magic != QCOW_MAGIC)
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347 | return false;
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348 |
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349 | if (pHeader->u32Version == 1)
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350 | {
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351 | pHeader->Version.v1.u64BackingFileOffset = RT_BE2H_U64(pHeader->Version.v1.u64BackingFileOffset);
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352 | pHeader->Version.v1.u32BackingFileSize = RT_BE2H_U32(pHeader->Version.v1.u32BackingFileSize);
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353 | pHeader->Version.v1.u32MTime = RT_BE2H_U32(pHeader->Version.v1.u32MTime);
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354 | pHeader->Version.v1.u64Size = RT_BE2H_U64(pHeader->Version.v1.u64Size);
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355 | pHeader->Version.v1.u32CryptMethod = RT_BE2H_U32(pHeader->Version.v1.u32CryptMethod);
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356 | pHeader->Version.v1.u64L1TableOffset = RT_BE2H_U64(pHeader->Version.v1.u64L1TableOffset);
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357 | }
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358 | else if (pHeader->u32Version == 2)
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359 | {
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360 | pHeader->Version.v2.u64BackingFileOffset = RT_BE2H_U64(pHeader->Version.v2.u64BackingFileOffset);
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361 | pHeader->Version.v2.u32BackingFileSize = RT_BE2H_U32(pHeader->Version.v2.u32BackingFileSize);
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362 | pHeader->Version.v2.u32ClusterBits = RT_BE2H_U32(pHeader->Version.v2.u32ClusterBits);
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363 | pHeader->Version.v2.u64Size = RT_BE2H_U64(pHeader->Version.v2.u64Size);
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364 | pHeader->Version.v2.u32CryptMethod = RT_BE2H_U32(pHeader->Version.v2.u32CryptMethod);
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365 | pHeader->Version.v2.u32L1Size = RT_BE2H_U32(pHeader->Version.v2.u32L1Size);
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366 | pHeader->Version.v2.u64L1TableOffset = RT_BE2H_U64(pHeader->Version.v2.u64L1TableOffset);
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367 | pHeader->Version.v2.u64RefcountTableOffset = RT_BE2H_U64(pHeader->Version.v2.u64RefcountTableOffset);
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368 | pHeader->Version.v2.u32RefcountTableClusters = RT_BE2H_U32(pHeader->Version.v2.u32RefcountTableClusters);
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369 | pHeader->Version.v2.u32NbSnapshots = RT_BE2H_U32(pHeader->Version.v2.u32NbSnapshots);
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370 | pHeader->Version.v2.u64SnapshotsOffset = RT_BE2H_U64(pHeader->Version.v2.u64SnapshotsOffset);
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371 | }
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372 | else
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373 | return false;
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374 |
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375 | return true;
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376 | }
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377 |
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378 | /**
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379 | * Creates a QCOW header from the given image state.
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380 | *
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381 | * @returns nothing.
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382 | * @param pImage Image instance data.
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383 | * @param pHeader Pointer to the header to convert.
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384 | * @param pcbHeader Where to store the size of the header to write.
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385 | */
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386 | static void qcowHdrConvertFromHostEndianess(PQCOWIMAGE pImage, PQCowHeader pHeader,
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387 | size_t *pcbHeader)
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388 | {
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389 | memset(pHeader, 0, sizeof(QCowHeader));
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390 |
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391 | pHeader->u32Magic = RT_H2BE_U32(QCOW_MAGIC);
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392 | pHeader->u32Version = RT_H2BE_U32(pImage->uVersion);
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393 | if (pImage->uVersion == 1)
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394 | {
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395 | pHeader->Version.v1.u64BackingFileOffset = RT_H2BE_U64(pImage->offBackingFilename);
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396 | pHeader->Version.v1.u32BackingFileSize = RT_H2BE_U32(pImage->cbBackingFilename);
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397 | pHeader->Version.v1.u32MTime = RT_H2BE_U32(pImage->MTime);
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398 | pHeader->Version.v1.u64Size = RT_H2BE_U64(pImage->cbSize);
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399 | pHeader->Version.v1.u8ClusterBits = (uint8_t)qcowGetPowerOfTwo(pImage->cbCluster);
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400 | pHeader->Version.v1.u8L2Bits = (uint8_t)qcowGetPowerOfTwo(pImage->cL2TableEntries);
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401 | pHeader->Version.v1.u32CryptMethod = RT_H2BE_U32(0);
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402 | pHeader->Version.v1.u64L1TableOffset = RT_H2BE_U64(pImage->offL1Table);
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403 | *pcbHeader = QCOW_V1_HDR_SIZE;
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404 | }
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405 | else if (pImage->uVersion == 2)
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406 | {
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407 | pHeader->Version.v2.u64BackingFileOffset = RT_H2BE_U64(pImage->offBackingFilename);
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408 | pHeader->Version.v2.u32BackingFileSize = RT_H2BE_U32(pImage->cbBackingFilename);
|
---|
409 | pHeader->Version.v2.u32ClusterBits = RT_H2BE_U32(qcowGetPowerOfTwo(pImage->cbCluster));
|
---|
410 | pHeader->Version.v2.u64Size = RT_H2BE_U64(pImage->cbSize);
|
---|
411 | pHeader->Version.v2.u32CryptMethod = RT_H2BE_U32(0);
|
---|
412 | pHeader->Version.v2.u32L1Size = RT_H2BE_U32(pImage->cL1TableEntries);
|
---|
413 | pHeader->Version.v2.u64L1TableOffset = RT_H2BE_U64(pImage->offL1Table);
|
---|
414 | pHeader->Version.v2.u64RefcountTableOffset = RT_H2BE_U64(pImage->offRefcountTable);
|
---|
415 | pHeader->Version.v2.u32RefcountTableClusters = RT_H2BE_U32(pImage->cbRefcountTable / pImage->cbCluster);
|
---|
416 | pHeader->Version.v2.u32NbSnapshots = RT_H2BE_U32(0);
|
---|
417 | pHeader->Version.v2.u64SnapshotsOffset = RT_H2BE_U64((uint64_t)0);
|
---|
418 | *pcbHeader = QCOW_V2_HDR_SIZE;
|
---|
419 | }
|
---|
420 | else
|
---|
421 | AssertMsgFailed(("Invalid version of the QCOW image format %d\n", pImage->uVersion));
|
---|
422 | }
|
---|
423 |
|
---|
424 | /**
|
---|
425 | * Convert table entries from little endian to host endianess.
|
---|
426 | *
|
---|
427 | * @returns nothing.
|
---|
428 | * @param paTbl Pointer to the table.
|
---|
429 | * @param cEntries Number of entries in the table.
|
---|
430 | */
|
---|
431 | static void qcowTableConvertToHostEndianess(uint64_t *paTbl, uint32_t cEntries)
|
---|
432 | {
|
---|
433 | while(cEntries-- > 0)
|
---|
434 | {
|
---|
435 | *paTbl = RT_BE2H_U64(*paTbl);
|
---|
436 | paTbl++;
|
---|
437 | }
|
---|
438 | }
|
---|
439 |
|
---|
440 | /**
|
---|
441 | * Convert table entries from host to little endian format.
|
---|
442 | *
|
---|
443 | * @returns nothing.
|
---|
444 | * @param paTblImg Pointer to the table which will store the little endian table.
|
---|
445 | * @param paTbl The source table to convert.
|
---|
446 | * @param cEntries Number of entries in the table.
|
---|
447 | */
|
---|
448 | static void qcowTableConvertFromHostEndianess(uint64_t *paTblImg, uint64_t *paTbl,
|
---|
449 | uint32_t cEntries)
|
---|
450 | {
|
---|
451 | while(cEntries-- > 0)
|
---|
452 | {
|
---|
453 | *paTblImg = RT_H2BE_U64(*paTbl);
|
---|
454 | paTbl++;
|
---|
455 | paTblImg++;
|
---|
456 | }
|
---|
457 | }
|
---|
458 |
|
---|
459 | /**
|
---|
460 | * Creates the L2 table cache.
|
---|
461 | *
|
---|
462 | * @returns VBox status code.
|
---|
463 | * @param pImage The image instance data.
|
---|
464 | */
|
---|
465 | static int qcowL2TblCacheCreate(PQCOWIMAGE pImage)
|
---|
466 | {
|
---|
467 | pImage->cbL2Cache = 0;
|
---|
468 | RTListInit(&pImage->ListSearch);
|
---|
469 | RTListInit(&pImage->ListLru);
|
---|
470 |
|
---|
471 | return VINF_SUCCESS;
|
---|
472 | }
|
---|
473 |
|
---|
474 | /**
|
---|
475 | * Destroys the L2 table cache.
|
---|
476 | *
|
---|
477 | * @returns nothing.
|
---|
478 | * @param pImage The image instance data.
|
---|
479 | */
|
---|
480 | static void qcowL2TblCacheDestroy(PQCOWIMAGE pImage)
|
---|
481 | {
|
---|
482 | PQCOWL2CACHEENTRY pL2Entry;
|
---|
483 | PQCOWL2CACHEENTRY pL2Next;
|
---|
484 | RTListForEachSafe(&pImage->ListSearch, pL2Entry, pL2Next, QCOWL2CACHEENTRY, NodeSearch)
|
---|
485 | {
|
---|
486 | Assert(!pL2Entry->cRefs);
|
---|
487 |
|
---|
488 | RTListNodeRemove(&pL2Entry->NodeSearch);
|
---|
489 | RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbL2Table);
|
---|
490 | RTMemFree(pL2Entry);
|
---|
491 | }
|
---|
492 |
|
---|
493 | pImage->cbL2Cache = 0;
|
---|
494 | RTListInit(&pImage->ListSearch);
|
---|
495 | RTListInit(&pImage->ListLru);
|
---|
496 | }
|
---|
497 |
|
---|
498 | /**
|
---|
499 | * Returns the L2 table matching the given offset or NULL if none could be found.
|
---|
500 | *
|
---|
501 | * @returns Pointer to the L2 table cache entry or NULL.
|
---|
502 | * @param pImage The image instance data.
|
---|
503 | * @param offL2Tbl Offset of the L2 table to search for.
|
---|
504 | */
|
---|
505 | static PQCOWL2CACHEENTRY qcowL2TblCacheRetain(PQCOWIMAGE pImage, uint64_t offL2Tbl)
|
---|
506 | {
|
---|
507 | if ( pImage->pL2TblAlloc
|
---|
508 | && pImage->pL2TblAlloc->offL2Tbl == offL2Tbl)
|
---|
509 | {
|
---|
510 | pImage->pL2TblAlloc->cRefs++;
|
---|
511 | return pImage->pL2TblAlloc;
|
---|
512 | }
|
---|
513 |
|
---|
514 | PQCOWL2CACHEENTRY pL2Entry;
|
---|
515 | RTListForEach(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch)
|
---|
516 | {
|
---|
517 | if (pL2Entry->offL2Tbl == offL2Tbl)
|
---|
518 | break;
|
---|
519 | }
|
---|
520 |
|
---|
521 | if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch))
|
---|
522 | {
|
---|
523 | /* Update LRU list. */
|
---|
524 | RTListNodeRemove(&pL2Entry->NodeLru);
|
---|
525 | RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
|
---|
526 | pL2Entry->cRefs++;
|
---|
527 | return pL2Entry;
|
---|
528 | }
|
---|
529 |
|
---|
530 | return NULL;
|
---|
531 | }
|
---|
532 |
|
---|
533 | /**
|
---|
534 | * Releases a L2 table cache entry.
|
---|
535 | *
|
---|
536 | * @returns nothing.
|
---|
537 | * @param pL2Entry The L2 cache entry.
|
---|
538 | */
|
---|
539 | static void qcowL2TblCacheEntryRelease(PQCOWL2CACHEENTRY pL2Entry)
|
---|
540 | {
|
---|
541 | Assert(pL2Entry->cRefs > 0);
|
---|
542 | pL2Entry->cRefs--;
|
---|
543 | }
|
---|
544 |
|
---|
545 | /**
|
---|
546 | * Allocates a new L2 table from the cache evicting old entries if required.
|
---|
547 | *
|
---|
548 | * @returns Pointer to the L2 cache entry or NULL.
|
---|
549 | * @param pImage The image instance data.
|
---|
550 | */
|
---|
551 | static PQCOWL2CACHEENTRY qcowL2TblCacheEntryAlloc(PQCOWIMAGE pImage)
|
---|
552 | {
|
---|
553 | PQCOWL2CACHEENTRY pL2Entry = NULL;
|
---|
554 |
|
---|
555 | if (pImage->cbL2Cache + pImage->cbL2Table <= QCOW_L2_CACHE_MEMORY_MAX)
|
---|
556 | {
|
---|
557 | /* Add a new entry. */
|
---|
558 | pL2Entry = (PQCOWL2CACHEENTRY)RTMemAllocZ(sizeof(QCOWL2CACHEENTRY));
|
---|
559 | if (pL2Entry)
|
---|
560 | {
|
---|
561 | pL2Entry->paL2Tbl = (uint64_t *)RTMemPageAllocZ(pImage->cbL2Table);
|
---|
562 | if (RT_UNLIKELY(!pL2Entry->paL2Tbl))
|
---|
563 | {
|
---|
564 | RTMemFree(pL2Entry);
|
---|
565 | pL2Entry = NULL;
|
---|
566 | }
|
---|
567 | else
|
---|
568 | {
|
---|
569 | pL2Entry->cRefs = 1;
|
---|
570 | pImage->cbL2Cache += pImage->cbL2Table;
|
---|
571 | }
|
---|
572 | }
|
---|
573 | }
|
---|
574 | else
|
---|
575 | {
|
---|
576 | /* Evict the last not in use entry and use it */
|
---|
577 | Assert(!RTListIsEmpty(&pImage->ListLru));
|
---|
578 |
|
---|
579 | RTListForEachReverse(&pImage->ListLru, pL2Entry, QCOWL2CACHEENTRY, NodeLru)
|
---|
580 | {
|
---|
581 | if (!pL2Entry->cRefs)
|
---|
582 | break;
|
---|
583 | }
|
---|
584 |
|
---|
585 | if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch))
|
---|
586 | {
|
---|
587 | RTListNodeRemove(&pL2Entry->NodeSearch);
|
---|
588 | RTListNodeRemove(&pL2Entry->NodeLru);
|
---|
589 | pL2Entry->offL2Tbl = 0;
|
---|
590 | pL2Entry->cRefs = 1;
|
---|
591 | }
|
---|
592 | else
|
---|
593 | pL2Entry = NULL;
|
---|
594 | }
|
---|
595 |
|
---|
596 | return pL2Entry;
|
---|
597 | }
|
---|
598 |
|
---|
599 | /**
|
---|
600 | * Frees a L2 table cache entry.
|
---|
601 | *
|
---|
602 | * @returns nothing.
|
---|
603 | * @param pImage The image instance data.
|
---|
604 | * @param pL2Entry The L2 cache entry to free.
|
---|
605 | */
|
---|
606 | static void qcowL2TblCacheEntryFree(PQCOWIMAGE pImage, PQCOWL2CACHEENTRY pL2Entry)
|
---|
607 | {
|
---|
608 | Assert(!pL2Entry->cRefs);
|
---|
609 | RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbL2Table);
|
---|
610 | RTMemFree(pL2Entry);
|
---|
611 |
|
---|
612 | pImage->cbL2Cache -= pImage->cbL2Table;
|
---|
613 | }
|
---|
614 |
|
---|
615 | /**
|
---|
616 | * Inserts an entry in the L2 table cache.
|
---|
617 | *
|
---|
618 | * @returns nothing.
|
---|
619 | * @param pImage The image instance data.
|
---|
620 | * @param pL2Entry The L2 cache entry to insert.
|
---|
621 | */
|
---|
622 | static void qcowL2TblCacheEntryInsert(PQCOWIMAGE pImage, PQCOWL2CACHEENTRY pL2Entry)
|
---|
623 | {
|
---|
624 | Assert(pL2Entry->offL2Tbl > 0);
|
---|
625 |
|
---|
626 | /* Insert at the top of the LRU list. */
|
---|
627 | RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
|
---|
628 |
|
---|
629 | if (RTListIsEmpty(&pImage->ListSearch))
|
---|
630 | {
|
---|
631 | RTListAppend(&pImage->ListSearch, &pL2Entry->NodeSearch);
|
---|
632 | }
|
---|
633 | else
|
---|
634 | {
|
---|
635 | /* Insert into search list. */
|
---|
636 | PQCOWL2CACHEENTRY pIt;
|
---|
637 | pIt = RTListGetFirst(&pImage->ListSearch, QCOWL2CACHEENTRY, NodeSearch);
|
---|
638 | if (pIt->offL2Tbl > pL2Entry->offL2Tbl)
|
---|
639 | RTListPrepend(&pImage->ListSearch, &pL2Entry->NodeSearch);
|
---|
640 | else
|
---|
641 | {
|
---|
642 | bool fInserted = false;
|
---|
643 |
|
---|
644 | RTListForEach(&pImage->ListSearch, pIt, QCOWL2CACHEENTRY, NodeSearch)
|
---|
645 | {
|
---|
646 | Assert(pIt->offL2Tbl != pL2Entry->offL2Tbl);
|
---|
647 | if (pIt->offL2Tbl < pL2Entry->offL2Tbl)
|
---|
648 | {
|
---|
649 | RTListNodeInsertAfter(&pIt->NodeSearch, &pL2Entry->NodeSearch);
|
---|
650 | fInserted = true;
|
---|
651 | break;
|
---|
652 | }
|
---|
653 | }
|
---|
654 | Assert(fInserted);
|
---|
655 | }
|
---|
656 | }
|
---|
657 | }
|
---|
658 |
|
---|
659 | /**
|
---|
660 | * Fetches the L2 from the given offset trying the LRU cache first and
|
---|
661 | * reading it from the image after a cache miss.
|
---|
662 | *
|
---|
663 | * @returns VBox status code.
|
---|
664 | * @param pImage Image instance data.
|
---|
665 | * @param pIoCtx The I/O context.
|
---|
666 | * @param offL2Tbl The offset of the L2 table in the image.
|
---|
667 | * @param ppL2Entry Where to store the L2 table on success.
|
---|
668 | */
|
---|
669 | static int qcowL2TblCacheFetch(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, uint64_t offL2Tbl,
|
---|
670 | PQCOWL2CACHEENTRY *ppL2Entry)
|
---|
671 | {
|
---|
672 | int rc = VINF_SUCCESS;
|
---|
673 |
|
---|
674 | /* Try to fetch the L2 table from the cache first. */
|
---|
675 | PQCOWL2CACHEENTRY pL2Entry = qcowL2TblCacheRetain(pImage, offL2Tbl);
|
---|
676 | if (!pL2Entry)
|
---|
677 | {
|
---|
678 | pL2Entry = qcowL2TblCacheEntryAlloc(pImage);
|
---|
679 |
|
---|
680 | if (pL2Entry)
|
---|
681 | {
|
---|
682 | /* Read from the image. */
|
---|
683 | PVDMETAXFER pMetaXfer;
|
---|
684 |
|
---|
685 | pL2Entry->offL2Tbl = offL2Tbl;
|
---|
686 | rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
|
---|
687 | offL2Tbl, pL2Entry->paL2Tbl,
|
---|
688 | pImage->cbL2Table, pIoCtx,
|
---|
689 | &pMetaXfer, NULL, NULL);
|
---|
690 | if (RT_SUCCESS(rc))
|
---|
691 | {
|
---|
692 | vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
|
---|
693 | #if defined(RT_LITTLE_ENDIAN)
|
---|
694 | qcowTableConvertToHostEndianess(pL2Entry->paL2Tbl, pImage->cL2TableEntries);
|
---|
695 | #endif
|
---|
696 | qcowL2TblCacheEntryInsert(pImage, pL2Entry);
|
---|
697 | }
|
---|
698 | else
|
---|
699 | {
|
---|
700 | qcowL2TblCacheEntryRelease(pL2Entry);
|
---|
701 | qcowL2TblCacheEntryFree(pImage, pL2Entry);
|
---|
702 | }
|
---|
703 | }
|
---|
704 | else
|
---|
705 | rc = VERR_NO_MEMORY;
|
---|
706 | }
|
---|
707 |
|
---|
708 | if (RT_SUCCESS(rc))
|
---|
709 | *ppL2Entry = pL2Entry;
|
---|
710 |
|
---|
711 | return rc;
|
---|
712 | }
|
---|
713 |
|
---|
714 | /**
|
---|
715 | * Sets the L1, L2 and offset bitmasks and L1 and L2 bit shift members.
|
---|
716 | *
|
---|
717 | * @returns nothing.
|
---|
718 | * @param pImage The image instance data.
|
---|
719 | */
|
---|
720 | static void qcowTableMasksInit(PQCOWIMAGE pImage)
|
---|
721 | {
|
---|
722 | uint32_t cClusterBits, cL2TableBits;
|
---|
723 |
|
---|
724 | cClusterBits = qcowGetPowerOfTwo(pImage->cbCluster);
|
---|
725 | cL2TableBits = qcowGetPowerOfTwo(pImage->cL2TableEntries);
|
---|
726 |
|
---|
727 | Assert(cClusterBits + cL2TableBits < 64);
|
---|
728 |
|
---|
729 | pImage->fOffsetMask = ((uint64_t)pImage->cbCluster - 1);
|
---|
730 | pImage->fL2Mask = ((uint64_t)pImage->cL2TableEntries - 1) << cClusterBits;
|
---|
731 | pImage->cL2Shift = cClusterBits;
|
---|
732 | pImage->cL1Shift = cClusterBits + cL2TableBits;
|
---|
733 | }
|
---|
734 |
|
---|
735 | /**
|
---|
736 | * Converts a given logical offset into the
|
---|
737 | *
|
---|
738 | * @returns nothing.
|
---|
739 | * @param pImage The image instance data.
|
---|
740 | * @param off The logical offset to convert.
|
---|
741 | * @param pidxL1 Where to store the index in the L1 table on success.
|
---|
742 | * @param pidxL2 Where to store the index in the L2 table on success.
|
---|
743 | * @param poffCluster Where to store the offset in the cluster on success.
|
---|
744 | */
|
---|
745 | DECLINLINE(void) qcowConvertLogicalOffset(PQCOWIMAGE pImage, uint64_t off, uint32_t *pidxL1,
|
---|
746 | uint32_t *pidxL2, uint32_t *poffCluster)
|
---|
747 | {
|
---|
748 | AssertPtr(pidxL1);
|
---|
749 | AssertPtr(pidxL2);
|
---|
750 | AssertPtr(poffCluster);
|
---|
751 |
|
---|
752 | *poffCluster = off & pImage->fOffsetMask;
|
---|
753 | *pidxL1 = off >> pImage->cL1Shift;
|
---|
754 | *pidxL2 = (off & pImage->fL2Mask) >> pImage->cL2Shift;
|
---|
755 | }
|
---|
756 |
|
---|
757 | /**
|
---|
758 | * Converts Cluster size to a byte size.
|
---|
759 | *
|
---|
760 | * @returns Number of bytes derived from the given number of clusters.
|
---|
761 | * @param pImage The image instance data.
|
---|
762 | * @param cClusters The clusters to convert.
|
---|
763 | */
|
---|
764 | DECLINLINE(uint64_t) qcowCluster2Byte(PQCOWIMAGE pImage, uint64_t cClusters)
|
---|
765 | {
|
---|
766 | return cClusters * pImage->cbCluster;
|
---|
767 | }
|
---|
768 |
|
---|
769 | /**
|
---|
770 | * Converts number of bytes to cluster size rounding to the next cluster.
|
---|
771 | *
|
---|
772 | * @returns Number of bytes derived from the given number of clusters.
|
---|
773 | * @param pImage The image instance data.
|
---|
774 | * @param cb Number of bytes to convert.
|
---|
775 | */
|
---|
776 | DECLINLINE(uint64_t) qcowByte2Cluster(PQCOWIMAGE pImage, uint64_t cb)
|
---|
777 | {
|
---|
778 | return cb / pImage->cbCluster + (cb % pImage->cbCluster ? 1 : 0);
|
---|
779 | }
|
---|
780 |
|
---|
781 | /**
|
---|
782 | * Allocates a new cluster in the image.
|
---|
783 | *
|
---|
784 | * @returns The start offset of the new cluster in the image.
|
---|
785 | * @param pImage The image instance data.
|
---|
786 | * @param cClusters Number of clusters to allocate.
|
---|
787 | */
|
---|
788 | DECLINLINE(uint64_t) qcowClusterAllocate(PQCOWIMAGE pImage, uint32_t cClusters)
|
---|
789 | {
|
---|
790 | uint64_t offCluster;
|
---|
791 |
|
---|
792 | offCluster = pImage->offNextCluster;
|
---|
793 | pImage->offNextCluster += cClusters*pImage->cbCluster;
|
---|
794 |
|
---|
795 | return offCluster;
|
---|
796 | }
|
---|
797 |
|
---|
798 | /**
|
---|
799 | * Returns the real image offset for a given cluster or an error if the cluster is not
|
---|
800 | * yet allocated.
|
---|
801 | *
|
---|
802 | * @returns VBox status code.
|
---|
803 | * VERR_VD_BLOCK_FREE if the cluster is not yet allocated.
|
---|
804 | * @param pImage The image instance data.
|
---|
805 | * @param pIoCtx The I/O context.
|
---|
806 | * @param idxL1 The L1 index.
|
---|
807 | * @param idxL2 The L2 index.
|
---|
808 | * @param offCluster Offset inside the cluster.
|
---|
809 | * @param poffImage Where to store the image offset on success;
|
---|
810 | */
|
---|
811 | static int qcowConvertToImageOffset(PQCOWIMAGE pImage, PVDIOCTX pIoCtx,
|
---|
812 | uint32_t idxL1, uint32_t idxL2,
|
---|
813 | uint32_t offCluster, uint64_t *poffImage)
|
---|
814 | {
|
---|
815 | int rc = VERR_VD_BLOCK_FREE;
|
---|
816 |
|
---|
817 | AssertReturn(idxL1 < pImage->cL1TableEntries, VERR_INVALID_PARAMETER);
|
---|
818 | AssertReturn(idxL2 < pImage->cL2TableEntries, VERR_INVALID_PARAMETER);
|
---|
819 |
|
---|
820 | if (pImage->paL1Table[idxL1])
|
---|
821 | {
|
---|
822 | PQCOWL2CACHEENTRY pL2Entry;
|
---|
823 |
|
---|
824 | rc = qcowL2TblCacheFetch(pImage, pIoCtx, pImage->paL1Table[idxL1], &pL2Entry);
|
---|
825 | if (RT_SUCCESS(rc))
|
---|
826 | {
|
---|
827 | /* Get real file offset. */
|
---|
828 | if (pL2Entry->paL2Tbl[idxL2])
|
---|
829 | {
|
---|
830 | uint64_t off = pL2Entry->paL2Tbl[idxL2];
|
---|
831 |
|
---|
832 | /* Strip flags */
|
---|
833 | if (pImage->uVersion == 2)
|
---|
834 | {
|
---|
835 | if (RT_UNLIKELY(off & QCOW_V2_COMPRESSED_FLAG))
|
---|
836 | rc = VERR_NOT_SUPPORTED;
|
---|
837 | else
|
---|
838 | off &= ~(QCOW_V2_COMPRESSED_FLAG | QCOW_V2_COPIED_FLAG);
|
---|
839 | }
|
---|
840 | else
|
---|
841 | {
|
---|
842 | if (RT_UNLIKELY(off & QCOW_V1_COMPRESSED_FLAG))
|
---|
843 | rc = VERR_NOT_SUPPORTED;
|
---|
844 | else
|
---|
845 | off &= ~QCOW_V1_COMPRESSED_FLAG;
|
---|
846 | }
|
---|
847 |
|
---|
848 | *poffImage = off + offCluster;
|
---|
849 | }
|
---|
850 | else
|
---|
851 | rc = VERR_VD_BLOCK_FREE;
|
---|
852 |
|
---|
853 | qcowL2TblCacheEntryRelease(pL2Entry);
|
---|
854 | }
|
---|
855 | }
|
---|
856 |
|
---|
857 | return rc;
|
---|
858 | }
|
---|
859 |
|
---|
860 | /**
|
---|
861 | * Write the given table to image converting to the image endianess if required.
|
---|
862 | *
|
---|
863 | * @returns VBox status code.
|
---|
864 | * @param pImage The image instance data.
|
---|
865 | * @param pIoCtx The I/O context.
|
---|
866 | * @param offTbl The offset the table should be written to.
|
---|
867 | * @param paTbl The table to write.
|
---|
868 | * @param cbTbl Size of the table in bytes.
|
---|
869 | * @param cTblEntries Number entries in the table.
|
---|
870 | * @param pfnComplete Callback called when the write completes.
|
---|
871 | * @param pvUser Opaque user data to pass in the completion callback.
|
---|
872 | */
|
---|
873 | static int qcowTblWrite(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, uint64_t offTbl, uint64_t *paTbl,
|
---|
874 | size_t cbTbl, unsigned cTblEntries,
|
---|
875 | PFNVDXFERCOMPLETED pfnComplete, void *pvUser)
|
---|
876 | {
|
---|
877 | int rc = VINF_SUCCESS;
|
---|
878 |
|
---|
879 | #if defined(RT_LITTLE_ENDIAN)
|
---|
880 | uint64_t *paTblImg = (uint64_t *)RTMemAllocZ(cbTbl);
|
---|
881 | if (paTblImg)
|
---|
882 | {
|
---|
883 | qcowTableConvertFromHostEndianess(paTblImg, paTbl, cTblEntries);
|
---|
884 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
885 | offTbl, paTblImg, cbTbl,
|
---|
886 | pIoCtx, pfnComplete, pvUser);
|
---|
887 | RTMemFree(paTblImg);
|
---|
888 | }
|
---|
889 | else
|
---|
890 | rc = VERR_NO_MEMORY;
|
---|
891 | #else
|
---|
892 | /* Write table directly. */
|
---|
893 | RT_NOREF(cTblEntries);
|
---|
894 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
895 | offTbl, paTbl, cbTbl, pIoCtx,
|
---|
896 | pfnComplete, pvUser);
|
---|
897 | #endif
|
---|
898 |
|
---|
899 | return rc;
|
---|
900 | }
|
---|
901 |
|
---|
902 | /**
|
---|
903 | * Internal. Flush image data to disk.
|
---|
904 | */
|
---|
905 | static int qcowFlushImage(PQCOWIMAGE pImage)
|
---|
906 | {
|
---|
907 | int rc = VINF_SUCCESS;
|
---|
908 |
|
---|
909 | if ( pImage->pStorage
|
---|
910 | && !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
911 | && pImage->cbL1Table)
|
---|
912 | {
|
---|
913 | QCowHeader Header;
|
---|
914 |
|
---|
915 | #if defined(RT_LITTLE_ENDIAN)
|
---|
916 | uint64_t *paL1TblImg = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
|
---|
917 | if (paL1TblImg)
|
---|
918 | {
|
---|
919 | qcowTableConvertFromHostEndianess(paL1TblImg, pImage->paL1Table,
|
---|
920 | pImage->cL1TableEntries);
|
---|
921 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
922 | pImage->offL1Table, paL1TblImg,
|
---|
923 | pImage->cbL1Table);
|
---|
924 | RTMemFree(paL1TblImg);
|
---|
925 | }
|
---|
926 | else
|
---|
927 | rc = VERR_NO_MEMORY;
|
---|
928 | #else
|
---|
929 | /* Write L1 table directly. */
|
---|
930 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offL1Table,
|
---|
931 | pImage->paL1Table, pImage->cbL1Table);
|
---|
932 | #endif
|
---|
933 | if (RT_SUCCESS(rc))
|
---|
934 | {
|
---|
935 | /* Write header. */
|
---|
936 | size_t cbHeader = 0;
|
---|
937 | qcowHdrConvertFromHostEndianess(pImage, &Header, &cbHeader);
|
---|
938 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Header,
|
---|
939 | cbHeader);
|
---|
940 | if (RT_SUCCESS(rc))
|
---|
941 | rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
|
---|
942 | }
|
---|
943 | }
|
---|
944 |
|
---|
945 | return rc;
|
---|
946 | }
|
---|
947 |
|
---|
948 | /**
|
---|
949 | * Internal. Free all allocated space for representing an image except pImage,
|
---|
950 | * and optionally delete the image from disk.
|
---|
951 | */
|
---|
952 | static int qcowFreeImage(PQCOWIMAGE pImage, bool fDelete)
|
---|
953 | {
|
---|
954 | int rc = VINF_SUCCESS;
|
---|
955 |
|
---|
956 | /* Freeing a never allocated image (e.g. because the open failed) is
|
---|
957 | * not signalled as an error. After all nothing bad happens. */
|
---|
958 | if (pImage)
|
---|
959 | {
|
---|
960 | if (pImage->pStorage)
|
---|
961 | {
|
---|
962 | /* No point updating the file that is deleted anyway. */
|
---|
963 | if (!fDelete)
|
---|
964 | qcowFlushImage(pImage);
|
---|
965 |
|
---|
966 | rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
|
---|
967 | pImage->pStorage = NULL;
|
---|
968 | }
|
---|
969 |
|
---|
970 | if (pImage->paL1Table)
|
---|
971 | RTMemFree(pImage->paL1Table);
|
---|
972 |
|
---|
973 | if (pImage->pszBackingFilename)
|
---|
974 | {
|
---|
975 | RTMemFree(pImage->pszBackingFilename);
|
---|
976 | pImage->pszBackingFilename = NULL;
|
---|
977 | }
|
---|
978 |
|
---|
979 | qcowL2TblCacheDestroy(pImage);
|
---|
980 |
|
---|
981 | if (fDelete && pImage->pszFilename)
|
---|
982 | vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
|
---|
983 | }
|
---|
984 |
|
---|
985 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
986 | return rc;
|
---|
987 | }
|
---|
988 |
|
---|
989 | /**
|
---|
990 | * Validates the header.
|
---|
991 | *
|
---|
992 | * @returns VBox status code.
|
---|
993 | * @param pImage Image backend instance data.
|
---|
994 | * @param pHdr The header to validate.
|
---|
995 | * @param cbFile The image file size in bytes.
|
---|
996 | */
|
---|
997 | static int qcowHdrValidate(PQCOWIMAGE pImage, PQCowHeader pHdr, uint64_t cbFile)
|
---|
998 | {
|
---|
999 | if (pHdr->u32Version == 1)
|
---|
1000 | {
|
---|
1001 | /* Check that the backing filename is contained in the file. */
|
---|
1002 | if (pHdr->Version.v1.u64BackingFileOffset + pHdr->Version.v1.u32BackingFileSize > cbFile)
|
---|
1003 | return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1004 | N_("QCOW: Backing file offset and size exceed size of image '%s' (%u vs %u)"),
|
---|
1005 | pImage->pszFilename, pHdr->Version.v1.u64BackingFileOffset + pHdr->Version.v1.u32BackingFileSize,
|
---|
1006 | cbFile);
|
---|
1007 |
|
---|
1008 | /* Check that the cluster bits indicate at least a 512byte sector size. */
|
---|
1009 | if (RT_BIT_32(pHdr->Version.v1.u8ClusterBits) < 512)
|
---|
1010 | return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1011 | N_("QCOW: Cluster size is too small for image '%s' (%u vs %u)"),
|
---|
1012 | pImage->pszFilename, RT_BIT_32(pHdr->Version.v1.u8ClusterBits), 512);
|
---|
1013 |
|
---|
1014 | /*
|
---|
1015 | * Check for possible overflow when multiplying cluster size and L2 entry count because it is used
|
---|
1016 | * to calculate the number of L1 table entries later on.
|
---|
1017 | */
|
---|
1018 | if (RT_BIT_32(pHdr->Version.v1.u8L2Bits) * RT_BIT_32(pHdr->Version.v1.u8ClusterBits) == 0)
|
---|
1019 | return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1020 | N_("QCOW: Overflow during L1 table size calculation for image '%s'"),
|
---|
1021 | pImage->pszFilename);
|
---|
1022 | }
|
---|
1023 | else if (pHdr->u32Version == 2)
|
---|
1024 | {
|
---|
1025 | /* Check that the backing filename is contained in the file. */
|
---|
1026 | if (pHdr->Version.v2.u64BackingFileOffset + pHdr->Version.v2.u32BackingFileSize > cbFile)
|
---|
1027 | return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1028 | N_("QCOW: Backing file offset and size exceed size of image '%s' (%u vs %u)"),
|
---|
1029 | pImage->pszFilename, pHdr->Version.v2.u64BackingFileOffset + pHdr->Version.v2.u32BackingFileSize,
|
---|
1030 | cbFile);
|
---|
1031 |
|
---|
1032 | /* Check that the cluster bits indicate at least a 512byte sector size. */
|
---|
1033 | if (RT_BIT_32(pHdr->Version.v2.u32ClusterBits) < 512)
|
---|
1034 | return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1035 | N_("QCOW: Cluster size is too small for image '%s' (%u vs %u)"),
|
---|
1036 | pImage->pszFilename, RT_BIT_32(pHdr->Version.v2.u32ClusterBits), 512);
|
---|
1037 | }
|
---|
1038 | else
|
---|
1039 | return vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
|
---|
1040 | N_("QCOW: Version %u in image '%s' is not supported"),
|
---|
1041 | pHdr->u32Version, pImage->pszFilename);
|
---|
1042 |
|
---|
1043 | return VINF_SUCCESS;
|
---|
1044 | }
|
---|
1045 |
|
---|
1046 | /**
|
---|
1047 | * Internal: Open an image, constructing all necessary data structures.
|
---|
1048 | */
|
---|
1049 | static int qcowOpenImage(PQCOWIMAGE pImage, unsigned uOpenFlags)
|
---|
1050 | {
|
---|
1051 | pImage->uOpenFlags = uOpenFlags;
|
---|
1052 |
|
---|
1053 | pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
|
---|
1054 | pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
|
---|
1055 | AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
|
---|
1056 |
|
---|
1057 | int rc = qcowL2TblCacheCreate(pImage);
|
---|
1058 | if (RT_SUCCESS(rc))
|
---|
1059 | {
|
---|
1060 | /* Open the image. */
|
---|
1061 | rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
|
---|
1062 | VDOpenFlagsToFileOpenFlags(uOpenFlags,
|
---|
1063 | false /* fCreate */),
|
---|
1064 | &pImage->pStorage);
|
---|
1065 | if (RT_SUCCESS(rc))
|
---|
1066 | {
|
---|
1067 | uint64_t cbFile;
|
---|
1068 | rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
|
---|
1069 | if ( RT_SUCCESS(rc)
|
---|
1070 | && cbFile > sizeof(QCowHeader))
|
---|
1071 | {
|
---|
1072 | QCowHeader Header;
|
---|
1073 |
|
---|
1074 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0, &Header, sizeof(Header));
|
---|
1075 | if ( RT_SUCCESS(rc)
|
---|
1076 | && qcowHdrConvertToHostEndianess(&Header))
|
---|
1077 | {
|
---|
1078 | pImage->offNextCluster = RT_ALIGN_64(cbFile, 512); /* Align image to sector boundary. */
|
---|
1079 | Assert(pImage->offNextCluster >= cbFile);
|
---|
1080 |
|
---|
1081 | rc = qcowHdrValidate(pImage, &Header, cbFile);
|
---|
1082 | if (RT_SUCCESS(rc))
|
---|
1083 | {
|
---|
1084 | if (Header.u32Version == 1)
|
---|
1085 | {
|
---|
1086 | if (!Header.Version.v1.u32CryptMethod)
|
---|
1087 | {
|
---|
1088 | pImage->uVersion = 1;
|
---|
1089 | pImage->offBackingFilename = Header.Version.v1.u64BackingFileOffset;
|
---|
1090 | pImage->cbBackingFilename = Header.Version.v1.u32BackingFileSize;
|
---|
1091 | pImage->MTime = Header.Version.v1.u32MTime;
|
---|
1092 | pImage->cbSize = Header.Version.v1.u64Size;
|
---|
1093 | pImage->cbCluster = RT_BIT_32(Header.Version.v1.u8ClusterBits);
|
---|
1094 | pImage->cL2TableEntries = RT_BIT_32(Header.Version.v1.u8L2Bits);
|
---|
1095 | pImage->cbL2Table = RT_ALIGN_64(pImage->cL2TableEntries * sizeof(uint64_t), pImage->cbCluster);
|
---|
1096 | pImage->offL1Table = Header.Version.v1.u64L1TableOffset;
|
---|
1097 | pImage->cL1TableEntries = pImage->cbSize / (pImage->cbCluster * pImage->cL2TableEntries);
|
---|
1098 | if (pImage->cbSize % (pImage->cbCluster * pImage->cL2TableEntries))
|
---|
1099 | pImage->cL1TableEntries++;
|
---|
1100 | }
|
---|
1101 | else
|
---|
1102 | rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
|
---|
1103 | N_("QCow: Encrypted image '%s' is not supported"),
|
---|
1104 | pImage->pszFilename);
|
---|
1105 | }
|
---|
1106 | else if (Header.u32Version == 2)
|
---|
1107 | {
|
---|
1108 | if (Header.Version.v2.u32CryptMethod)
|
---|
1109 | rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
|
---|
1110 | N_("QCow: Encrypted image '%s' is not supported"),
|
---|
1111 | pImage->pszFilename);
|
---|
1112 | else if (Header.Version.v2.u32NbSnapshots)
|
---|
1113 | rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
|
---|
1114 | N_("QCow: Image '%s' contains snapshots which is not supported"),
|
---|
1115 | pImage->pszFilename);
|
---|
1116 | else
|
---|
1117 | {
|
---|
1118 | pImage->uVersion = 2;
|
---|
1119 | pImage->offBackingFilename = Header.Version.v2.u64BackingFileOffset;
|
---|
1120 | pImage->cbBackingFilename = Header.Version.v2.u32BackingFileSize;
|
---|
1121 | pImage->cbSize = Header.Version.v2.u64Size;
|
---|
1122 | pImage->cbCluster = RT_BIT_32(Header.Version.v2.u32ClusterBits);
|
---|
1123 | pImage->cL2TableEntries = pImage->cbCluster / sizeof(uint64_t);
|
---|
1124 | pImage->cbL2Table = pImage->cbCluster;
|
---|
1125 | pImage->offL1Table = Header.Version.v2.u64L1TableOffset;
|
---|
1126 | pImage->cL1TableEntries = Header.Version.v2.u32L1Size;
|
---|
1127 | pImage->offRefcountTable = Header.Version.v2.u64RefcountTableOffset;
|
---|
1128 | pImage->cbRefcountTable = qcowCluster2Byte(pImage, Header.Version.v2.u32RefcountTableClusters);
|
---|
1129 | pImage->cRefcountTableEntries = pImage->cbRefcountTable / sizeof(uint64_t);
|
---|
1130 | }
|
---|
1131 | }
|
---|
1132 | else
|
---|
1133 | rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
|
---|
1134 | N_("QCow: Image '%s' uses version %u which is not supported"),
|
---|
1135 | pImage->pszFilename, Header.u32Version);
|
---|
1136 |
|
---|
1137 | pImage->cbL1Table = RT_ALIGN_64(pImage->cL1TableEntries * sizeof(uint64_t), pImage->cbCluster);
|
---|
1138 | if ((uint64_t)pImage->cbL1Table != RT_ALIGN_64(pImage->cL1TableEntries * sizeof(uint64_t), pImage->cbCluster))
|
---|
1139 | rc = vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
|
---|
1140 | N_("QCOW: L1 table size overflow in image '%s'"),
|
---|
1141 | pImage->pszFilename);
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 | /** @todo Check that there are no compressed clusters in the image
|
---|
1145 | * (by traversing the L2 tables and checking each offset).
|
---|
1146 | * Refuse to open such images.
|
---|
1147 | */
|
---|
1148 |
|
---|
1149 | if ( RT_SUCCESS(rc)
|
---|
1150 | && pImage->cbBackingFilename
|
---|
1151 | && pImage->offBackingFilename)
|
---|
1152 | {
|
---|
1153 | /* Load backing filename from image. */
|
---|
1154 | pImage->pszBackingFilename = (char *)RTMemAllocZ(pImage->cbBackingFilename + 1); /* +1 for \0 terminator. */
|
---|
1155 | if (pImage->pszBackingFilename)
|
---|
1156 | {
|
---|
1157 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
1158 | pImage->offBackingFilename, pImage->pszBackingFilename,
|
---|
1159 | pImage->cbBackingFilename);
|
---|
1160 | }
|
---|
1161 | else
|
---|
1162 | rc = VERR_NO_MEMORY;
|
---|
1163 | }
|
---|
1164 |
|
---|
1165 | if ( RT_SUCCESS(rc)
|
---|
1166 | && pImage->cbRefcountTable
|
---|
1167 | && pImage->offRefcountTable)
|
---|
1168 | {
|
---|
1169 | /* Load refcount table. */
|
---|
1170 | Assert(pImage->cRefcountTableEntries);
|
---|
1171 | pImage->paRefcountTable = (uint64_t *)RTMemAllocZ(pImage->cbRefcountTable);
|
---|
1172 | if (RT_LIKELY(pImage->paRefcountTable))
|
---|
1173 | {
|
---|
1174 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
1175 | pImage->offRefcountTable, pImage->paRefcountTable,
|
---|
1176 | pImage->cbRefcountTable);
|
---|
1177 | if (RT_SUCCESS(rc))
|
---|
1178 | qcowTableConvertToHostEndianess(pImage->paRefcountTable,
|
---|
1179 | pImage->cRefcountTableEntries);
|
---|
1180 | else
|
---|
1181 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
|
---|
1182 | N_("QCow: Reading refcount table of image '%s' failed"),
|
---|
1183 | pImage->pszFilename);
|
---|
1184 | }
|
---|
1185 | else
|
---|
1186 | rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
|
---|
1187 | N_("QCow: Allocating memory for refcount table of image '%s' failed"),
|
---|
1188 | pImage->pszFilename);
|
---|
1189 | }
|
---|
1190 |
|
---|
1191 | if (RT_SUCCESS(rc))
|
---|
1192 | {
|
---|
1193 | qcowTableMasksInit(pImage);
|
---|
1194 |
|
---|
1195 | /* Allocate L1 table. */
|
---|
1196 | pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
|
---|
1197 | if (pImage->paL1Table)
|
---|
1198 | {
|
---|
1199 | /* Read from the image. */
|
---|
1200 | rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
|
---|
1201 | pImage->offL1Table, pImage->paL1Table,
|
---|
1202 | pImage->cbL1Table);
|
---|
1203 | if (RT_SUCCESS(rc))
|
---|
1204 | qcowTableConvertToHostEndianess(pImage->paL1Table, pImage->cL1TableEntries);
|
---|
1205 | else
|
---|
1206 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
|
---|
1207 | N_("QCow: Reading the L1 table for image '%s' failed"),
|
---|
1208 | pImage->pszFilename);
|
---|
1209 | }
|
---|
1210 | else
|
---|
1211 | rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
|
---|
1212 | N_("QCow: Out of memory allocating L1 table for image '%s'"),
|
---|
1213 | pImage->pszFilename);
|
---|
1214 | }
|
---|
1215 | }
|
---|
1216 | else if (RT_SUCCESS(rc))
|
---|
1217 | rc = VERR_VD_GEN_INVALID_HEADER;
|
---|
1218 | }
|
---|
1219 | else if (RT_SUCCESS(rc))
|
---|
1220 | rc = VERR_VD_GEN_INVALID_HEADER;
|
---|
1221 | }
|
---|
1222 | /* else: Do NOT signal an appropriate error here, as the VD layer has the
|
---|
1223 | * choice of retrying the open if it failed. */
|
---|
1224 | }
|
---|
1225 | else
|
---|
1226 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
|
---|
1227 | N_("Qcow: Creating the L2 table cache for image '%s' failed"),
|
---|
1228 | pImage->pszFilename);
|
---|
1229 |
|
---|
1230 | if (RT_SUCCESS(rc))
|
---|
1231 | {
|
---|
1232 | PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
|
---|
1233 | pImage->RegionList.fFlags = 0;
|
---|
1234 | pImage->RegionList.cRegions = 1;
|
---|
1235 |
|
---|
1236 | pRegion->offRegion = 0; /* Disk start. */
|
---|
1237 | pRegion->cbBlock = 512;
|
---|
1238 | pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
|
---|
1239 | pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
|
---|
1240 | pRegion->cbData = 512;
|
---|
1241 | pRegion->cbMetadata = 0;
|
---|
1242 | pRegion->cRegionBlocksOrBytes = pImage->cbSize;
|
---|
1243 | }
|
---|
1244 | else
|
---|
1245 | qcowFreeImage(pImage, false);
|
---|
1246 | return rc;
|
---|
1247 | }
|
---|
1248 |
|
---|
1249 | /**
|
---|
1250 | * Internal: Create a qcow image.
|
---|
1251 | */
|
---|
1252 | static int qcowCreateImage(PQCOWIMAGE pImage, uint64_t cbSize,
|
---|
1253 | unsigned uImageFlags, const char *pszComment,
|
---|
1254 | PCVDGEOMETRY pPCHSGeometry,
|
---|
1255 | PCVDGEOMETRY pLCHSGeometry, unsigned uOpenFlags,
|
---|
1256 | PVDINTERFACEPROGRESS pIfProgress,
|
---|
1257 | unsigned uPercentStart, unsigned uPercentSpan)
|
---|
1258 | {
|
---|
1259 | RT_NOREF1(pszComment);
|
---|
1260 | int rc;
|
---|
1261 | int32_t fOpen;
|
---|
1262 |
|
---|
1263 | if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
|
---|
1264 | {
|
---|
1265 | rc = qcowL2TblCacheCreate(pImage);
|
---|
1266 | if (RT_SUCCESS(rc))
|
---|
1267 | {
|
---|
1268 | pImage->uOpenFlags = uOpenFlags & ~VD_OPEN_FLAGS_READONLY;
|
---|
1269 | pImage->uImageFlags = uImageFlags;
|
---|
1270 | pImage->PCHSGeometry = *pPCHSGeometry;
|
---|
1271 | pImage->LCHSGeometry = *pLCHSGeometry;
|
---|
1272 | pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
|
---|
1273 | pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
|
---|
1274 | AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
|
---|
1275 |
|
---|
1276 | /* Create image file. */
|
---|
1277 | fOpen = VDOpenFlagsToFileOpenFlags(pImage->uOpenFlags, true /* fCreate */);
|
---|
1278 | rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename, fOpen, &pImage->pStorage);
|
---|
1279 | if (RT_SUCCESS(rc))
|
---|
1280 | {
|
---|
1281 | /* Init image state. */
|
---|
1282 | pImage->uVersion = 1; /* We create only version 1 images at the moment. */
|
---|
1283 | pImage->cbSize = cbSize;
|
---|
1284 | pImage->cbCluster = QCOW_CLUSTER_SIZE_DEFAULT;
|
---|
1285 | pImage->cbL2Table = qcowCluster2Byte(pImage, QCOW_L2_CLUSTERS_DEFAULT);
|
---|
1286 | pImage->cL2TableEntries = pImage->cbL2Table / sizeof(uint64_t);
|
---|
1287 | pImage->cL1TableEntries = cbSize / (pImage->cbCluster * pImage->cL2TableEntries);
|
---|
1288 | if (cbSize % (pImage->cbCluster * pImage->cL2TableEntries))
|
---|
1289 | pImage->cL1TableEntries++;
|
---|
1290 | pImage->cbL1Table = pImage->cL1TableEntries * sizeof(uint64_t);
|
---|
1291 | pImage->offL1Table = QCOW_V1_HDR_SIZE;
|
---|
1292 | pImage->cbBackingFilename = 0;
|
---|
1293 | pImage->offBackingFilename = 0;
|
---|
1294 | pImage->offNextCluster = RT_ALIGN_64(QCOW_V1_HDR_SIZE + pImage->cbL1Table, pImage->cbCluster);
|
---|
1295 | qcowTableMasksInit(pImage);
|
---|
1296 |
|
---|
1297 | /* Init L1 table. */
|
---|
1298 | pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
|
---|
1299 | if (RT_LIKELY(pImage->paL1Table))
|
---|
1300 | {
|
---|
1301 | if (RT_SUCCESS(rc))
|
---|
1302 | vdIfProgress(pIfProgress, uPercentStart + uPercentSpan * 98 / 100);
|
---|
1303 |
|
---|
1304 | rc = qcowFlushImage(pImage);
|
---|
1305 | if (RT_SUCCESS(rc))
|
---|
1306 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->offNextCluster);
|
---|
1307 | }
|
---|
1308 | else
|
---|
1309 | rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("QCow: cannot allocate memory for L1 table of image '%s'"),
|
---|
1310 | pImage->pszFilename);
|
---|
1311 | }
|
---|
1312 | else
|
---|
1313 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("QCow: cannot create image '%s'"), pImage->pszFilename);
|
---|
1314 | }
|
---|
1315 | else
|
---|
1316 | rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("QCow: Failed to create L2 cache for image '%s'"),
|
---|
1317 | pImage->pszFilename);
|
---|
1318 | }
|
---|
1319 | else
|
---|
1320 | rc = vdIfError(pImage->pIfError, VERR_VD_INVALID_TYPE, RT_SRC_POS, N_("QCow: cannot create fixed image '%s'"), pImage->pszFilename);
|
---|
1321 |
|
---|
1322 | if (RT_SUCCESS(rc))
|
---|
1323 | vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
|
---|
1324 |
|
---|
1325 | if (RT_SUCCESS(rc))
|
---|
1326 | {
|
---|
1327 | PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
|
---|
1328 | pImage->RegionList.fFlags = 0;
|
---|
1329 | pImage->RegionList.cRegions = 1;
|
---|
1330 |
|
---|
1331 | pRegion->offRegion = 0; /* Disk start. */
|
---|
1332 | pRegion->cbBlock = 512;
|
---|
1333 | pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
|
---|
1334 | pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
|
---|
1335 | pRegion->cbData = 512;
|
---|
1336 | pRegion->cbMetadata = 0;
|
---|
1337 | pRegion->cRegionBlocksOrBytes = pImage->cbSize;
|
---|
1338 | }
|
---|
1339 | else
|
---|
1340 | qcowFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
|
---|
1341 | return rc;
|
---|
1342 | }
|
---|
1343 |
|
---|
1344 | /**
|
---|
1345 | * Rollback anything done during async cluster allocation.
|
---|
1346 | *
|
---|
1347 | * @returns VBox status code.
|
---|
1348 | * @param pImage The image instance data.
|
---|
1349 | * @param pIoCtx The I/O context.
|
---|
1350 | * @param pClusterAlloc The cluster allocation to rollback.
|
---|
1351 | */
|
---|
1352 | static int qcowAsyncClusterAllocRollback(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, PQCOWCLUSTERASYNCALLOC pClusterAlloc)
|
---|
1353 | {
|
---|
1354 | RT_NOREF1(pIoCtx);
|
---|
1355 | int rc = VINF_SUCCESS;
|
---|
1356 |
|
---|
1357 | switch (pClusterAlloc->enmAllocState)
|
---|
1358 | {
|
---|
1359 | case QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC:
|
---|
1360 | case QCOWCLUSTERASYNCALLOCSTATE_L2_LINK:
|
---|
1361 | {
|
---|
1362 | /* Revert the L1 table entry */
|
---|
1363 | pImage->paL1Table[pClusterAlloc->idxL1] = 0;
|
---|
1364 | pImage->pL2TblAlloc = NULL;
|
---|
1365 |
|
---|
1366 | /* Assumption right now is that the L1 table is not modified on storage if the link fails. */
|
---|
1367 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->offNextClusterOld);
|
---|
1368 | qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
|
---|
1369 | Assert(!pClusterAlloc->pL2Entry->cRefs);
|
---|
1370 | qcowL2TblCacheEntryFree(pImage, pClusterAlloc->pL2Entry); /* Free it, it is not in the cache yet. */
|
---|
1371 | break;
|
---|
1372 | }
|
---|
1373 | case QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC:
|
---|
1374 | case QCOWCLUSTERASYNCALLOCSTATE_USER_LINK:
|
---|
1375 | {
|
---|
1376 | /* Assumption right now is that the L2 table is not modified if the link fails. */
|
---|
1377 | pClusterAlloc->pL2Entry->paL2Tbl[pClusterAlloc->idxL2] = 0;
|
---|
1378 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->offNextClusterOld);
|
---|
1379 | qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
|
---|
1380 | break;
|
---|
1381 | }
|
---|
1382 | default:
|
---|
1383 | AssertMsgFailed(("Invalid cluster allocation state %d\n", pClusterAlloc->enmAllocState));
|
---|
1384 | rc = VERR_INVALID_STATE;
|
---|
1385 | }
|
---|
1386 |
|
---|
1387 | RTMemFree(pClusterAlloc);
|
---|
1388 | return rc;
|
---|
1389 | }
|
---|
1390 |
|
---|
1391 | /**
|
---|
1392 | * Updates the state of the async cluster allocation.
|
---|
1393 | *
|
---|
1394 | * @returns VBox status code.
|
---|
1395 | * @param pBackendData The opaque backend data.
|
---|
1396 | * @param pIoCtx I/O context associated with this request.
|
---|
1397 | * @param pvUser Opaque user data passed during a read/write request.
|
---|
1398 | * @param rcReq Status code for the completed request.
|
---|
1399 | */
|
---|
1400 | static DECLCALLBACK(int) qcowAsyncClusterAllocUpdate(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
|
---|
1401 | {
|
---|
1402 | int rc = VINF_SUCCESS;
|
---|
1403 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1404 | PQCOWCLUSTERASYNCALLOC pClusterAlloc = (PQCOWCLUSTERASYNCALLOC)pvUser;
|
---|
1405 |
|
---|
1406 | if (RT_FAILURE(rcReq))
|
---|
1407 | return qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
|
---|
1408 |
|
---|
1409 | AssertPtr(pClusterAlloc->pL2Entry);
|
---|
1410 |
|
---|
1411 | switch (pClusterAlloc->enmAllocState)
|
---|
1412 | {
|
---|
1413 | case QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC:
|
---|
1414 | {
|
---|
1415 | /* Update the link in the in memory L1 table now. */
|
---|
1416 | pImage->paL1Table[pClusterAlloc->idxL1] = pClusterAlloc->pL2Entry->offL2Tbl;
|
---|
1417 |
|
---|
1418 | /* Update the link in the on disk L1 table now. */
|
---|
1419 | pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_L2_LINK;
|
---|
1420 | rc = qcowTblWrite(pImage, pIoCtx, pImage->offL1Table, pImage->paL1Table,
|
---|
1421 | pImage->cbL1Table, pImage->cL1TableEntries,
|
---|
1422 | qcowAsyncClusterAllocUpdate, pClusterAlloc);
|
---|
1423 | if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1424 | break;
|
---|
1425 | else if (RT_FAILURE(rc))
|
---|
1426 | {
|
---|
1427 | /* Rollback. */
|
---|
1428 | qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
|
---|
1429 | break;
|
---|
1430 | }
|
---|
1431 | /* Success, fall through. */
|
---|
1432 | }
|
---|
1433 | /* fall thru */
|
---|
1434 | case QCOWCLUSTERASYNCALLOCSTATE_L2_LINK:
|
---|
1435 | {
|
---|
1436 | /* L2 link updated in L1 , save L2 entry in cache and allocate new user data cluster. */
|
---|
1437 | uint64_t offData = qcowClusterAllocate(pImage, 1);
|
---|
1438 |
|
---|
1439 | pImage->pL2TblAlloc = NULL;
|
---|
1440 | qcowL2TblCacheEntryInsert(pImage, pClusterAlloc->pL2Entry);
|
---|
1441 |
|
---|
1442 | pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC;
|
---|
1443 | pClusterAlloc->offNextClusterOld = offData;
|
---|
1444 | pClusterAlloc->offClusterNew = offData;
|
---|
1445 |
|
---|
1446 | /* Write data. */
|
---|
1447 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1448 | offData, pIoCtx, pClusterAlloc->cbToWrite,
|
---|
1449 | qcowAsyncClusterAllocUpdate, pClusterAlloc);
|
---|
1450 | if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1451 | break;
|
---|
1452 | else if (RT_FAILURE(rc))
|
---|
1453 | {
|
---|
1454 | qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
|
---|
1455 | RTMemFree(pClusterAlloc);
|
---|
1456 | break;
|
---|
1457 | }
|
---|
1458 | }
|
---|
1459 | /* fall thru */
|
---|
1460 | case QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC:
|
---|
1461 | {
|
---|
1462 | pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_LINK;
|
---|
1463 | pClusterAlloc->pL2Entry->paL2Tbl[pClusterAlloc->idxL2] = pClusterAlloc->offClusterNew;
|
---|
1464 |
|
---|
1465 | /* Link L2 table and update it. */
|
---|
1466 | rc = qcowTblWrite(pImage, pIoCtx, pImage->paL1Table[pClusterAlloc->idxL1],
|
---|
1467 | pClusterAlloc->pL2Entry->paL2Tbl,
|
---|
1468 | pImage->cbL2Table, pImage->cL2TableEntries,
|
---|
1469 | qcowAsyncClusterAllocUpdate, pClusterAlloc);
|
---|
1470 | if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1471 | break;
|
---|
1472 | else if (RT_FAILURE(rc))
|
---|
1473 | {
|
---|
1474 | qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
|
---|
1475 | RTMemFree(pClusterAlloc);
|
---|
1476 | break;
|
---|
1477 | }
|
---|
1478 | }
|
---|
1479 | /* fall thru */
|
---|
1480 | case QCOWCLUSTERASYNCALLOCSTATE_USER_LINK:
|
---|
1481 | {
|
---|
1482 | /* Everything done without errors, signal completion. */
|
---|
1483 | qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry);
|
---|
1484 | RTMemFree(pClusterAlloc);
|
---|
1485 | rc = VINF_SUCCESS;
|
---|
1486 | break;
|
---|
1487 | }
|
---|
1488 | default:
|
---|
1489 | AssertMsgFailed(("Invalid async cluster allocation state %d\n",
|
---|
1490 | pClusterAlloc->enmAllocState));
|
---|
1491 | }
|
---|
1492 |
|
---|
1493 | return rc;
|
---|
1494 | }
|
---|
1495 |
|
---|
1496 | /** @copydoc VDIMAGEBACKEND::pfnProbe */
|
---|
1497 | static DECLCALLBACK(int) qcowProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
|
---|
1498 | PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
|
---|
1499 | {
|
---|
1500 | RT_NOREF1(pVDIfsDisk);
|
---|
1501 | LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
|
---|
1502 | PVDIOSTORAGE pStorage = NULL;
|
---|
1503 | uint64_t cbFile;
|
---|
1504 | int rc = VINF_SUCCESS;
|
---|
1505 |
|
---|
1506 | /* Get I/O interface. */
|
---|
1507 | PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
|
---|
1508 | AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
|
---|
1509 | AssertReturn((VALID_PTR(pszFilename) && *pszFilename), VERR_INVALID_PARAMETER);
|
---|
1510 |
|
---|
1511 | /*
|
---|
1512 | * Open the file and read the footer.
|
---|
1513 | */
|
---|
1514 | rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
|
---|
1515 | VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
|
---|
1516 | false /* fCreate */),
|
---|
1517 | &pStorage);
|
---|
1518 | if (RT_SUCCESS(rc))
|
---|
1519 | {
|
---|
1520 | rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
|
---|
1521 | if ( RT_SUCCESS(rc)
|
---|
1522 | && cbFile > sizeof(QCowHeader))
|
---|
1523 | {
|
---|
1524 | QCowHeader Header;
|
---|
1525 |
|
---|
1526 | rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &Header, sizeof(Header));
|
---|
1527 | if ( RT_SUCCESS(rc)
|
---|
1528 | && qcowHdrConvertToHostEndianess(&Header))
|
---|
1529 | *penmType = VDTYPE_HDD;
|
---|
1530 | else
|
---|
1531 | rc = VERR_VD_GEN_INVALID_HEADER;
|
---|
1532 | }
|
---|
1533 | else
|
---|
1534 | rc = VERR_VD_GEN_INVALID_HEADER;
|
---|
1535 | }
|
---|
1536 |
|
---|
1537 | if (pStorage)
|
---|
1538 | vdIfIoIntFileClose(pIfIo, pStorage);
|
---|
1539 |
|
---|
1540 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1541 | return rc;
|
---|
1542 | }
|
---|
1543 |
|
---|
1544 | /** @copydoc VDIMAGEBACKEND::pfnOpen */
|
---|
1545 | static DECLCALLBACK(int) qcowOpen(const char *pszFilename, unsigned uOpenFlags,
|
---|
1546 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
---|
1547 | VDTYPE enmType, void **ppBackendData)
|
---|
1548 | {
|
---|
1549 | RT_NOREF1(enmType); /**< @todo r=klaus make use of the type info. */
|
---|
1550 |
|
---|
1551 | LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
|
---|
1552 | pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
|
---|
1553 | int rc;
|
---|
1554 |
|
---|
1555 | /* Check open flags. All valid flags are supported. */
|
---|
1556 | AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
|
---|
1557 | AssertReturn((VALID_PTR(pszFilename) && *pszFilename), VERR_INVALID_PARAMETER);
|
---|
1558 |
|
---|
1559 | PQCOWIMAGE pImage = (PQCOWIMAGE)RTMemAllocZ(RT_UOFFSETOF(QCOWIMAGE, RegionList.aRegions[1]));
|
---|
1560 | if (RT_LIKELY(pImage))
|
---|
1561 | {
|
---|
1562 | pImage->pszFilename = pszFilename;
|
---|
1563 | pImage->pStorage = NULL;
|
---|
1564 | pImage->pVDIfsDisk = pVDIfsDisk;
|
---|
1565 | pImage->pVDIfsImage = pVDIfsImage;
|
---|
1566 |
|
---|
1567 | rc = qcowOpenImage(pImage, uOpenFlags);
|
---|
1568 | if (RT_SUCCESS(rc))
|
---|
1569 | *ppBackendData = pImage;
|
---|
1570 | else
|
---|
1571 | RTMemFree(pImage);
|
---|
1572 | }
|
---|
1573 | else
|
---|
1574 | rc = VERR_NO_MEMORY;
|
---|
1575 |
|
---|
1576 | LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
|
---|
1577 | return rc;
|
---|
1578 | }
|
---|
1579 |
|
---|
1580 | /** @copydoc VDIMAGEBACKEND::pfnCreate */
|
---|
1581 | static DECLCALLBACK(int) qcowCreate(const char *pszFilename, uint64_t cbSize,
|
---|
1582 | unsigned uImageFlags, const char *pszComment,
|
---|
1583 | PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
|
---|
1584 | PCRTUUID pUuid, unsigned uOpenFlags,
|
---|
1585 | unsigned uPercentStart, unsigned uPercentSpan,
|
---|
1586 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
---|
1587 | PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
|
---|
1588 | void **ppBackendData)
|
---|
1589 | {
|
---|
1590 | RT_NOREF1(pUuid);
|
---|
1591 | 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",
|
---|
1592 | pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
|
---|
1593 | int rc;
|
---|
1594 |
|
---|
1595 | /* Check the VD container type. */
|
---|
1596 | if (enmType != VDTYPE_HDD)
|
---|
1597 | return VERR_VD_INVALID_TYPE;
|
---|
1598 |
|
---|
1599 | /* Check open flags. All valid flags are supported. */
|
---|
1600 | AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
|
---|
1601 | AssertReturn( VALID_PTR(pszFilename)
|
---|
1602 | && *pszFilename
|
---|
1603 | && VALID_PTR(pPCHSGeometry)
|
---|
1604 | && VALID_PTR(pLCHSGeometry), VERR_INVALID_PARAMETER);
|
---|
1605 |
|
---|
1606 | PQCOWIMAGE pImage = (PQCOWIMAGE)RTMemAllocZ(RT_UOFFSETOF(QCOWIMAGE, RegionList.aRegions[1]));
|
---|
1607 | if (RT_LIKELY(pImage))
|
---|
1608 | {
|
---|
1609 | PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
|
---|
1610 |
|
---|
1611 | pImage->pszFilename = pszFilename;
|
---|
1612 | pImage->pStorage = NULL;
|
---|
1613 | pImage->pVDIfsDisk = pVDIfsDisk;
|
---|
1614 | pImage->pVDIfsImage = pVDIfsImage;
|
---|
1615 |
|
---|
1616 | rc = qcowCreateImage(pImage, cbSize, uImageFlags, pszComment,
|
---|
1617 | pPCHSGeometry, pLCHSGeometry, uOpenFlags,
|
---|
1618 | pIfProgress, uPercentStart, uPercentSpan);
|
---|
1619 | if (RT_SUCCESS(rc))
|
---|
1620 | {
|
---|
1621 | /* So far the image is opened in read/write mode. Make sure the
|
---|
1622 | * image is opened in read-only mode if the caller requested that. */
|
---|
1623 | if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
1624 | {
|
---|
1625 | qcowFreeImage(pImage, false);
|
---|
1626 | rc = qcowOpenImage(pImage, uOpenFlags);
|
---|
1627 | }
|
---|
1628 |
|
---|
1629 | if (RT_SUCCESS(rc))
|
---|
1630 | *ppBackendData = pImage;
|
---|
1631 | }
|
---|
1632 |
|
---|
1633 | if (RT_FAILURE(rc))
|
---|
1634 | RTMemFree(pImage);
|
---|
1635 | }
|
---|
1636 | else
|
---|
1637 | rc = VERR_NO_MEMORY;
|
---|
1638 |
|
---|
1639 | LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
|
---|
1640 | return rc;
|
---|
1641 | }
|
---|
1642 |
|
---|
1643 | /** @copydoc VDIMAGEBACKEND::pfnRename */
|
---|
1644 | static DECLCALLBACK(int) qcowRename(void *pBackendData, const char *pszFilename)
|
---|
1645 | {
|
---|
1646 | LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
|
---|
1647 | int rc = VINF_SUCCESS;
|
---|
1648 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1649 |
|
---|
1650 | /* Check arguments. */
|
---|
1651 | AssertReturn((pImage && pszFilename && *pszFilename), VERR_INVALID_PARAMETER);
|
---|
1652 |
|
---|
1653 | /* Close the image. */
|
---|
1654 | rc = qcowFreeImage(pImage, false);
|
---|
1655 | if (RT_SUCCESS(rc))
|
---|
1656 | {
|
---|
1657 | /* Rename the file. */
|
---|
1658 | rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
|
---|
1659 | if (RT_SUCCESS(rc))
|
---|
1660 | {
|
---|
1661 | /* Update pImage with the new information. */
|
---|
1662 | pImage->pszFilename = pszFilename;
|
---|
1663 |
|
---|
1664 | /* Open the old image with new name. */
|
---|
1665 | rc = qcowOpenImage(pImage, pImage->uOpenFlags);
|
---|
1666 | }
|
---|
1667 | else
|
---|
1668 | {
|
---|
1669 | /* The move failed, try to reopen the original image. */
|
---|
1670 | int rc2 = qcowOpenImage(pImage, pImage->uOpenFlags);
|
---|
1671 | if (RT_FAILURE(rc2))
|
---|
1672 | rc = rc2;
|
---|
1673 | }
|
---|
1674 | }
|
---|
1675 |
|
---|
1676 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1677 | return rc;
|
---|
1678 | }
|
---|
1679 |
|
---|
1680 | /** @copydoc VDIMAGEBACKEND::pfnClose */
|
---|
1681 | static DECLCALLBACK(int) qcowClose(void *pBackendData, bool fDelete)
|
---|
1682 | {
|
---|
1683 | LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
|
---|
1684 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1685 |
|
---|
1686 | int rc = qcowFreeImage(pImage, fDelete);
|
---|
1687 | RTMemFree(pImage);
|
---|
1688 |
|
---|
1689 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1690 | return rc;
|
---|
1691 | }
|
---|
1692 |
|
---|
1693 | static DECLCALLBACK(int) qcowRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
|
---|
1694 | PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
|
---|
1695 | {
|
---|
1696 | LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
|
---|
1697 | pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
|
---|
1698 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1699 | uint32_t offCluster = 0;
|
---|
1700 | uint32_t idxL1 = 0;
|
---|
1701 | uint32_t idxL2 = 0;
|
---|
1702 | uint64_t offFile = 0;
|
---|
1703 | int rc;
|
---|
1704 |
|
---|
1705 | AssertPtr(pImage);
|
---|
1706 | Assert(uOffset % 512 == 0);
|
---|
1707 | Assert(cbToRead % 512 == 0);
|
---|
1708 | AssertReturn((VALID_PTR(pIoCtx) && cbToRead), VERR_INVALID_PARAMETER);
|
---|
1709 | AssertReturn(uOffset + cbToRead <= pImage->cbSize, VERR_INVALID_PARAMETER);
|
---|
1710 |
|
---|
1711 | qcowConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
|
---|
1712 |
|
---|
1713 | /* Clip read size to remain in the cluster. */
|
---|
1714 | cbToRead = RT_MIN(cbToRead, pImage->cbCluster - offCluster);
|
---|
1715 |
|
---|
1716 | /* Get offset in image. */
|
---|
1717 | rc = qcowConvertToImageOffset(pImage, pIoCtx, idxL1, idxL2, offCluster, &offFile);
|
---|
1718 | if (RT_SUCCESS(rc))
|
---|
1719 | rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, offFile,
|
---|
1720 | pIoCtx, cbToRead);
|
---|
1721 |
|
---|
1722 | if ( ( RT_SUCCESS(rc)
|
---|
1723 | || rc == VERR_VD_BLOCK_FREE
|
---|
1724 | || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1725 | && pcbActuallyRead)
|
---|
1726 | *pcbActuallyRead = cbToRead;
|
---|
1727 |
|
---|
1728 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1729 | return rc;
|
---|
1730 | }
|
---|
1731 |
|
---|
1732 | static DECLCALLBACK(int) qcowWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
|
---|
1733 | PVDIOCTX pIoCtx, size_t *pcbWriteProcess, size_t *pcbPreRead,
|
---|
1734 | size_t *pcbPostRead, unsigned fWrite)
|
---|
1735 | {
|
---|
1736 | LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
|
---|
1737 | pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
|
---|
1738 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1739 | uint32_t offCluster = 0;
|
---|
1740 | uint32_t idxL1 = 0;
|
---|
1741 | uint32_t idxL2 = 0;
|
---|
1742 | uint64_t offImage = 0;
|
---|
1743 | int rc = VINF_SUCCESS;
|
---|
1744 |
|
---|
1745 | AssertPtr(pImage);
|
---|
1746 | Assert(!(uOffset % 512));
|
---|
1747 | Assert(!(cbToWrite % 512));
|
---|
1748 | AssertReturn((VALID_PTR(pIoCtx) && cbToWrite), VERR_INVALID_PARAMETER);
|
---|
1749 | AssertReturn(uOffset + cbToWrite <= pImage->cbSize, VERR_INVALID_PARAMETER);
|
---|
1750 |
|
---|
1751 | if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
|
---|
1752 | {
|
---|
1753 | /* Convert offset to L1, L2 index and cluster offset. */
|
---|
1754 | qcowConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
|
---|
1755 |
|
---|
1756 | /* Clip write size to remain in the cluster. */
|
---|
1757 | cbToWrite = RT_MIN(cbToWrite, pImage->cbCluster - offCluster);
|
---|
1758 | Assert(!(cbToWrite % 512));
|
---|
1759 |
|
---|
1760 | /* Get offset in image. */
|
---|
1761 | rc = qcowConvertToImageOffset(pImage, pIoCtx, idxL1, idxL2, offCluster, &offImage);
|
---|
1762 | if (RT_SUCCESS(rc))
|
---|
1763 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1764 | offImage, pIoCtx, cbToWrite, NULL, NULL);
|
---|
1765 | else if (rc == VERR_VD_BLOCK_FREE)
|
---|
1766 | {
|
---|
1767 | if ( cbToWrite == pImage->cbCluster
|
---|
1768 | && !(fWrite & VD_WRITE_NO_ALLOC))
|
---|
1769 | {
|
---|
1770 | PQCOWL2CACHEENTRY pL2Entry = NULL;
|
---|
1771 |
|
---|
1772 | /* Full cluster write to previously unallocated cluster.
|
---|
1773 | * Allocate cluster and write data. */
|
---|
1774 | Assert(!offCluster);
|
---|
1775 |
|
---|
1776 | do
|
---|
1777 | {
|
---|
1778 | /* Check if we have to allocate a new cluster for L2 tables. */
|
---|
1779 | if (!pImage->paL1Table[idxL1])
|
---|
1780 | {
|
---|
1781 | uint64_t offL2Tbl;
|
---|
1782 | PQCOWCLUSTERASYNCALLOC pL2ClusterAlloc = NULL;
|
---|
1783 |
|
---|
1784 | /* Allocate new async cluster allocation state. */
|
---|
1785 | pL2ClusterAlloc = (PQCOWCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QCOWCLUSTERASYNCALLOC));
|
---|
1786 | if (RT_UNLIKELY(!pL2ClusterAlloc))
|
---|
1787 | {
|
---|
1788 | rc = VERR_NO_MEMORY;
|
---|
1789 | break;
|
---|
1790 | }
|
---|
1791 |
|
---|
1792 | pL2Entry = qcowL2TblCacheEntryAlloc(pImage);
|
---|
1793 | if (!pL2Entry)
|
---|
1794 | {
|
---|
1795 | rc = VERR_NO_MEMORY;
|
---|
1796 | RTMemFree(pL2ClusterAlloc);
|
---|
1797 | break;
|
---|
1798 | }
|
---|
1799 |
|
---|
1800 | offL2Tbl = qcowClusterAllocate(pImage, qcowByte2Cluster(pImage, pImage->cbL2Table));
|
---|
1801 | pL2Entry->offL2Tbl = offL2Tbl;
|
---|
1802 | memset(pL2Entry->paL2Tbl, 0, pImage->cbL2Table);
|
---|
1803 |
|
---|
1804 | pL2ClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC;
|
---|
1805 | pL2ClusterAlloc->offNextClusterOld = offL2Tbl;
|
---|
1806 | pL2ClusterAlloc->offClusterNew = offL2Tbl;
|
---|
1807 | pL2ClusterAlloc->idxL1 = idxL1;
|
---|
1808 | pL2ClusterAlloc->idxL2 = idxL2;
|
---|
1809 | pL2ClusterAlloc->cbToWrite = cbToWrite;
|
---|
1810 | pL2ClusterAlloc->pL2Entry = pL2Entry;
|
---|
1811 |
|
---|
1812 | pImage->pL2TblAlloc = pL2Entry;
|
---|
1813 |
|
---|
1814 | LogFlowFunc(("Allocating new L2 table at cluster offset %llu\n", offL2Tbl));
|
---|
1815 |
|
---|
1816 | /*
|
---|
1817 | * Write the L2 table first and link to the L1 table afterwards.
|
---|
1818 | * If something unexpected happens the worst case which can happen
|
---|
1819 | * is a leak of some clusters.
|
---|
1820 | */
|
---|
1821 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1822 | offL2Tbl, pL2Entry->paL2Tbl, pImage->cbL2Table, pIoCtx,
|
---|
1823 | qcowAsyncClusterAllocUpdate, pL2ClusterAlloc);
|
---|
1824 | if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1825 | break;
|
---|
1826 | else if (RT_FAILURE(rc))
|
---|
1827 | {
|
---|
1828 | RTMemFree(pL2ClusterAlloc);
|
---|
1829 | qcowL2TblCacheEntryFree(pImage, pL2Entry);
|
---|
1830 | break;
|
---|
1831 | }
|
---|
1832 |
|
---|
1833 | rc = qcowAsyncClusterAllocUpdate(pImage, pIoCtx, pL2ClusterAlloc, rc);
|
---|
1834 | }
|
---|
1835 | else
|
---|
1836 | {
|
---|
1837 | LogFlowFunc(("Fetching L2 table at cluster offset %llu\n", pImage->paL1Table[idxL1]));
|
---|
1838 |
|
---|
1839 | rc = qcowL2TblCacheFetch(pImage, pIoCtx, pImage->paL1Table[idxL1],
|
---|
1840 | &pL2Entry);
|
---|
1841 | if (RT_SUCCESS(rc))
|
---|
1842 | {
|
---|
1843 | PQCOWCLUSTERASYNCALLOC pDataClusterAlloc = NULL;
|
---|
1844 |
|
---|
1845 | /* Allocate new async cluster allocation state. */
|
---|
1846 | pDataClusterAlloc = (PQCOWCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QCOWCLUSTERASYNCALLOC));
|
---|
1847 | if (RT_UNLIKELY(!pDataClusterAlloc))
|
---|
1848 | {
|
---|
1849 | rc = VERR_NO_MEMORY;
|
---|
1850 | break;
|
---|
1851 | }
|
---|
1852 |
|
---|
1853 | /* Allocate new cluster for the data. */
|
---|
1854 | uint64_t offData = qcowClusterAllocate(pImage, 1);
|
---|
1855 |
|
---|
1856 | pDataClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC;
|
---|
1857 | pDataClusterAlloc->offNextClusterOld = offData;
|
---|
1858 | pDataClusterAlloc->offClusterNew = offData;
|
---|
1859 | pDataClusterAlloc->idxL1 = idxL1;
|
---|
1860 | pDataClusterAlloc->idxL2 = idxL2;
|
---|
1861 | pDataClusterAlloc->cbToWrite = cbToWrite;
|
---|
1862 | pDataClusterAlloc->pL2Entry = pL2Entry;
|
---|
1863 |
|
---|
1864 | /* Write data. */
|
---|
1865 | rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
|
---|
1866 | offData, pIoCtx, cbToWrite,
|
---|
1867 | qcowAsyncClusterAllocUpdate, pDataClusterAlloc);
|
---|
1868 | if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1869 | break;
|
---|
1870 | else if (RT_FAILURE(rc))
|
---|
1871 | {
|
---|
1872 | RTMemFree(pDataClusterAlloc);
|
---|
1873 | break;
|
---|
1874 | }
|
---|
1875 |
|
---|
1876 | rc = qcowAsyncClusterAllocUpdate(pImage, pIoCtx, pDataClusterAlloc, rc);
|
---|
1877 | }
|
---|
1878 | }
|
---|
1879 |
|
---|
1880 | } while (0);
|
---|
1881 |
|
---|
1882 | *pcbPreRead = 0;
|
---|
1883 | *pcbPostRead = 0;
|
---|
1884 | }
|
---|
1885 | else
|
---|
1886 | {
|
---|
1887 | /* Trying to do a partial write to an unallocated cluster. Don't do
|
---|
1888 | * anything except letting the upper layer know what to do. */
|
---|
1889 | *pcbPreRead = offCluster;
|
---|
1890 | *pcbPostRead = pImage->cbCluster - cbToWrite - *pcbPreRead;
|
---|
1891 | }
|
---|
1892 | }
|
---|
1893 |
|
---|
1894 | if (pcbWriteProcess)
|
---|
1895 | *pcbWriteProcess = cbToWrite;
|
---|
1896 | }
|
---|
1897 | else
|
---|
1898 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
1899 |
|
---|
1900 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1901 | return rc;
|
---|
1902 | }
|
---|
1903 |
|
---|
1904 | static DECLCALLBACK(int) qcowFlush(void *pBackendData, PVDIOCTX pIoCtx)
|
---|
1905 | {
|
---|
1906 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1907 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1908 | int rc = VINF_SUCCESS;
|
---|
1909 |
|
---|
1910 | AssertPtr(pImage);
|
---|
1911 | AssertPtrReturn(pIoCtx, VERR_INVALID_PARAMETER);
|
---|
1912 |
|
---|
1913 | if ( pImage->pStorage
|
---|
1914 | && !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
|
---|
1915 | {
|
---|
1916 | QCowHeader Header;
|
---|
1917 |
|
---|
1918 | rc = qcowTblWrite(pImage, pIoCtx, pImage->offL1Table, pImage->paL1Table,
|
---|
1919 | pImage->cbL1Table, pImage->cL1TableEntries, NULL, NULL);
|
---|
1920 | if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1921 | {
|
---|
1922 | /* Write header. */
|
---|
1923 | size_t cbHeader = 0;
|
---|
1924 | qcowHdrConvertFromHostEndianess(pImage, &Header, &cbHeader);
|
---|
1925 | rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
|
---|
1926 | 0, &Header, cbHeader,
|
---|
1927 | pIoCtx, NULL, NULL);
|
---|
1928 | if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
|
---|
1929 | rc = vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage,
|
---|
1930 | pIoCtx, NULL, NULL);
|
---|
1931 | }
|
---|
1932 | }
|
---|
1933 |
|
---|
1934 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
1935 | return rc;
|
---|
1936 | }
|
---|
1937 |
|
---|
1938 | /** @copydoc VDIMAGEBACKEND::pfnGetVersion */
|
---|
1939 | static DECLCALLBACK(unsigned) qcowGetVersion(void *pBackendData)
|
---|
1940 | {
|
---|
1941 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1942 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1943 |
|
---|
1944 | AssertPtrReturn(pImage, 0);
|
---|
1945 |
|
---|
1946 | return pImage->uVersion;
|
---|
1947 | }
|
---|
1948 |
|
---|
1949 | /** @copydoc VDIMAGEBACKEND::pfnGetFileSize */
|
---|
1950 | static DECLCALLBACK(uint64_t) qcowGetFileSize(void *pBackendData)
|
---|
1951 | {
|
---|
1952 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
1953 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1954 | uint64_t cb = 0;
|
---|
1955 |
|
---|
1956 | AssertPtrReturn(pImage, 0);
|
---|
1957 |
|
---|
1958 | uint64_t cbFile;
|
---|
1959 | if (pImage->pStorage)
|
---|
1960 | {
|
---|
1961 | int rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
|
---|
1962 | if (RT_SUCCESS(rc))
|
---|
1963 | cb += cbFile;
|
---|
1964 | }
|
---|
1965 |
|
---|
1966 | LogFlowFunc(("returns %lld\n", cb));
|
---|
1967 | return cb;
|
---|
1968 | }
|
---|
1969 |
|
---|
1970 | /** @copydoc VDIMAGEBACKEND::pfnGetPCHSGeometry */
|
---|
1971 | static DECLCALLBACK(int) qcowGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
|
---|
1972 | {
|
---|
1973 | LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
|
---|
1974 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1975 | int rc = VINF_SUCCESS;
|
---|
1976 |
|
---|
1977 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1978 |
|
---|
1979 | if (pImage->PCHSGeometry.cCylinders)
|
---|
1980 | *pPCHSGeometry = pImage->PCHSGeometry;
|
---|
1981 | else
|
---|
1982 | rc = VERR_VD_GEOMETRY_NOT_SET;
|
---|
1983 |
|
---|
1984 | LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
|
---|
1985 | return rc;
|
---|
1986 | }
|
---|
1987 |
|
---|
1988 | /** @copydoc VDIMAGEBACKEND::pfnSetPCHSGeometry */
|
---|
1989 | static DECLCALLBACK(int) qcowSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
|
---|
1990 | {
|
---|
1991 | LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n",
|
---|
1992 | pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
|
---|
1993 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
1994 | int rc = VINF_SUCCESS;
|
---|
1995 |
|
---|
1996 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
1997 |
|
---|
1998 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
1999 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2000 | else
|
---|
2001 | pImage->PCHSGeometry = *pPCHSGeometry;
|
---|
2002 |
|
---|
2003 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2004 | return rc;
|
---|
2005 | }
|
---|
2006 |
|
---|
2007 | /** @copydoc VDIMAGEBACKEND::pfnGetLCHSGeometry */
|
---|
2008 | static DECLCALLBACK(int) qcowGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
|
---|
2009 | {
|
---|
2010 | LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
|
---|
2011 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2012 | int rc = VINF_SUCCESS;
|
---|
2013 |
|
---|
2014 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2015 |
|
---|
2016 | if (pImage->LCHSGeometry.cCylinders)
|
---|
2017 | *pLCHSGeometry = pImage->LCHSGeometry;
|
---|
2018 | else
|
---|
2019 | rc = VERR_VD_GEOMETRY_NOT_SET;
|
---|
2020 |
|
---|
2021 | LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders,
|
---|
2022 | pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
|
---|
2023 | return rc;
|
---|
2024 | }
|
---|
2025 |
|
---|
2026 | /** @copydoc VDIMAGEBACKEND::pfnSetLCHSGeometry */
|
---|
2027 | static DECLCALLBACK(int) qcowSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
|
---|
2028 | {
|
---|
2029 | LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData,
|
---|
2030 | pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
|
---|
2031 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2032 | int rc = VINF_SUCCESS;
|
---|
2033 |
|
---|
2034 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2035 |
|
---|
2036 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2037 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2038 | else
|
---|
2039 | pImage->LCHSGeometry = *pLCHSGeometry;
|
---|
2040 |
|
---|
2041 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2042 | return rc;
|
---|
2043 | }
|
---|
2044 |
|
---|
2045 | /** @copydoc VDIMAGEBACKEND::pfnQueryRegions */
|
---|
2046 | static DECLCALLBACK(int) qcowQueryRegions(void *pBackendData, PCVDREGIONLIST *ppRegionList)
|
---|
2047 | {
|
---|
2048 | LogFlowFunc(("pBackendData=%#p ppRegionList=%#p\n", pBackendData, ppRegionList));
|
---|
2049 | PQCOWIMAGE pThis = (PQCOWIMAGE)pBackendData;
|
---|
2050 |
|
---|
2051 | AssertPtrReturn(pThis, VERR_VD_NOT_OPENED);
|
---|
2052 |
|
---|
2053 | *ppRegionList = &pThis->RegionList;
|
---|
2054 | LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
|
---|
2055 | return VINF_SUCCESS;
|
---|
2056 | }
|
---|
2057 |
|
---|
2058 | /** @copydoc VDIMAGEBACKEND::pfnRegionListRelease */
|
---|
2059 | static DECLCALLBACK(void) qcowRegionListRelease(void *pBackendData, PCVDREGIONLIST pRegionList)
|
---|
2060 | {
|
---|
2061 | RT_NOREF1(pRegionList);
|
---|
2062 | LogFlowFunc(("pBackendData=%#p pRegionList=%#p\n", pBackendData, pRegionList));
|
---|
2063 | PQCOWIMAGE pThis = (PQCOWIMAGE)pBackendData;
|
---|
2064 | AssertPtr(pThis); RT_NOREF(pThis);
|
---|
2065 |
|
---|
2066 | /* Nothing to do here. */
|
---|
2067 | }
|
---|
2068 |
|
---|
2069 | /** @copydoc VDIMAGEBACKEND::pfnGetImageFlags */
|
---|
2070 | static DECLCALLBACK(unsigned) qcowGetImageFlags(void *pBackendData)
|
---|
2071 | {
|
---|
2072 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
2073 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2074 |
|
---|
2075 | AssertPtrReturn(pImage, 0);
|
---|
2076 |
|
---|
2077 | LogFlowFunc(("returns %#x\n", pImage->uImageFlags));
|
---|
2078 | return pImage->uImageFlags;
|
---|
2079 | }
|
---|
2080 |
|
---|
2081 | /** @copydoc VDIMAGEBACKEND::pfnGetOpenFlags */
|
---|
2082 | static DECLCALLBACK(unsigned) qcowGetOpenFlags(void *pBackendData)
|
---|
2083 | {
|
---|
2084 | LogFlowFunc(("pBackendData=%#p\n", pBackendData));
|
---|
2085 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2086 |
|
---|
2087 | AssertPtrReturn(pImage, 0);
|
---|
2088 |
|
---|
2089 | LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
|
---|
2090 | return pImage->uOpenFlags;
|
---|
2091 | }
|
---|
2092 |
|
---|
2093 | /** @copydoc VDIMAGEBACKEND::pfnSetOpenFlags */
|
---|
2094 | static DECLCALLBACK(int) qcowSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
|
---|
2095 | {
|
---|
2096 | LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
|
---|
2097 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2098 | int rc = VINF_SUCCESS;
|
---|
2099 |
|
---|
2100 | /* Image must be opened and the new flags must be valid. */
|
---|
2101 | if (!pImage || (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO
|
---|
2102 | | VD_OPEN_FLAGS_ASYNC_IO | VD_OPEN_FLAGS_SHAREABLE
|
---|
2103 | | VD_OPEN_FLAGS_SEQUENTIAL | VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)))
|
---|
2104 | rc = VERR_INVALID_PARAMETER;
|
---|
2105 | else
|
---|
2106 | {
|
---|
2107 | /* Implement this operation via reopening the image. */
|
---|
2108 | rc = qcowFreeImage(pImage, false);
|
---|
2109 | if (RT_SUCCESS(rc))
|
---|
2110 | rc = qcowOpenImage(pImage, uOpenFlags);
|
---|
2111 | }
|
---|
2112 |
|
---|
2113 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2114 | return rc;
|
---|
2115 | }
|
---|
2116 |
|
---|
2117 | /** @copydoc VDIMAGEBACKEND::pfnGetComment */
|
---|
2118 | static DECLCALLBACK(int) qcowGetComment(void *pBackendData, char *pszComment, size_t cbComment)
|
---|
2119 | {
|
---|
2120 | RT_NOREF2(pszComment, cbComment);
|
---|
2121 | LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
|
---|
2122 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2123 |
|
---|
2124 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2125 |
|
---|
2126 | LogFlowFunc(("returns %Rrc comment='%s'\n", VERR_NOT_SUPPORTED, pszComment));
|
---|
2127 | return VERR_NOT_SUPPORTED;
|
---|
2128 | }
|
---|
2129 |
|
---|
2130 | /** @copydoc VDIMAGEBACKEND::pfnSetComment */
|
---|
2131 | static DECLCALLBACK(int) qcowSetComment(void *pBackendData, const char *pszComment)
|
---|
2132 | {
|
---|
2133 | RT_NOREF1(pszComment);
|
---|
2134 | LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
|
---|
2135 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2136 |
|
---|
2137 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2138 |
|
---|
2139 | int rc;
|
---|
2140 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2141 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2142 | else
|
---|
2143 | rc = VERR_NOT_SUPPORTED;
|
---|
2144 |
|
---|
2145 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2146 | return rc;
|
---|
2147 | }
|
---|
2148 |
|
---|
2149 | /** @copydoc VDIMAGEBACKEND::pfnGetUuid */
|
---|
2150 | static DECLCALLBACK(int) qcowGetUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2151 | {
|
---|
2152 | RT_NOREF1(pUuid);
|
---|
2153 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2154 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2155 |
|
---|
2156 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2157 |
|
---|
2158 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2159 | return VERR_NOT_SUPPORTED;
|
---|
2160 | }
|
---|
2161 |
|
---|
2162 | /** @copydoc VDIMAGEBACKEND::pfnSetUuid */
|
---|
2163 | static DECLCALLBACK(int) qcowSetUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2164 | {
|
---|
2165 | RT_NOREF1(pUuid);
|
---|
2166 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2167 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2168 |
|
---|
2169 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2170 |
|
---|
2171 | int rc;
|
---|
2172 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2173 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2174 | else
|
---|
2175 | rc = VERR_NOT_SUPPORTED;
|
---|
2176 |
|
---|
2177 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2178 | return rc;
|
---|
2179 | }
|
---|
2180 |
|
---|
2181 | /** @copydoc VDIMAGEBACKEND::pfnGetModificationUuid */
|
---|
2182 | static DECLCALLBACK(int) qcowGetModificationUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2183 | {
|
---|
2184 | RT_NOREF1(pUuid);
|
---|
2185 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2186 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2187 |
|
---|
2188 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2189 |
|
---|
2190 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2191 | return VERR_NOT_SUPPORTED;
|
---|
2192 | }
|
---|
2193 |
|
---|
2194 | /** @copydoc VDIMAGEBACKEND::pfnSetModificationUuid */
|
---|
2195 | static DECLCALLBACK(int) qcowSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2196 | {
|
---|
2197 | RT_NOREF1(pUuid);
|
---|
2198 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2199 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2200 |
|
---|
2201 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2202 |
|
---|
2203 | int rc;
|
---|
2204 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2205 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2206 | else
|
---|
2207 | rc = VERR_NOT_SUPPORTED;
|
---|
2208 |
|
---|
2209 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2210 | return rc;
|
---|
2211 | }
|
---|
2212 |
|
---|
2213 | /** @copydoc VDIMAGEBACKEND::pfnGetParentUuid */
|
---|
2214 | static DECLCALLBACK(int) qcowGetParentUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2215 | {
|
---|
2216 | RT_NOREF1(pUuid);
|
---|
2217 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2218 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2219 |
|
---|
2220 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2221 |
|
---|
2222 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2223 | return VERR_NOT_SUPPORTED;
|
---|
2224 | }
|
---|
2225 |
|
---|
2226 | /** @copydoc VDIMAGEBACKEND::pfnSetParentUuid */
|
---|
2227 | static DECLCALLBACK(int) qcowSetParentUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2228 | {
|
---|
2229 | RT_NOREF1(pUuid);
|
---|
2230 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2231 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2232 |
|
---|
2233 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2234 |
|
---|
2235 | int rc;
|
---|
2236 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2237 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2238 | else
|
---|
2239 | rc = VERR_NOT_SUPPORTED;
|
---|
2240 |
|
---|
2241 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2242 | return rc;
|
---|
2243 | }
|
---|
2244 |
|
---|
2245 | /** @copydoc VDIMAGEBACKEND::pfnGetParentModificationUuid */
|
---|
2246 | static DECLCALLBACK(int) qcowGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
|
---|
2247 | {
|
---|
2248 | RT_NOREF1(pUuid);
|
---|
2249 | LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
|
---|
2250 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2251 |
|
---|
2252 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2253 |
|
---|
2254 | LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
|
---|
2255 | return VERR_NOT_SUPPORTED;
|
---|
2256 | }
|
---|
2257 |
|
---|
2258 | /** @copydoc VDIMAGEBACKEND::pfnSetParentModificationUuid */
|
---|
2259 | static DECLCALLBACK(int) qcowSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
|
---|
2260 | {
|
---|
2261 | RT_NOREF1(pUuid);
|
---|
2262 | LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
|
---|
2263 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2264 |
|
---|
2265 | AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
|
---|
2266 |
|
---|
2267 | int rc;
|
---|
2268 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2269 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2270 | else
|
---|
2271 | rc = VERR_NOT_SUPPORTED;
|
---|
2272 |
|
---|
2273 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2274 | return rc;
|
---|
2275 | }
|
---|
2276 |
|
---|
2277 | /** @copydoc VDIMAGEBACKEND::pfnDump */
|
---|
2278 | static DECLCALLBACK(void) qcowDump(void *pBackendData)
|
---|
2279 | {
|
---|
2280 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2281 |
|
---|
2282 | AssertPtrReturnVoid(pImage);
|
---|
2283 | vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%llu\n",
|
---|
2284 | pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
|
---|
2285 | pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
|
---|
2286 | pImage->cbSize / 512);
|
---|
2287 | }
|
---|
2288 |
|
---|
2289 | /** @copydoc VDIMAGEBACKEND::pfnGetParentFilename */
|
---|
2290 | static DECLCALLBACK(int) qcowGetParentFilename(void *pBackendData, char **ppszParentFilename)
|
---|
2291 | {
|
---|
2292 | int rc = VINF_SUCCESS;
|
---|
2293 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2294 |
|
---|
2295 | AssertPtr(pImage);
|
---|
2296 | if (pImage)
|
---|
2297 | if (pImage->pszBackingFilename)
|
---|
2298 | *ppszParentFilename = RTStrDup(pImage->pszBackingFilename);
|
---|
2299 | else
|
---|
2300 | rc = VERR_NOT_SUPPORTED;
|
---|
2301 | else
|
---|
2302 | rc = VERR_VD_NOT_OPENED;
|
---|
2303 |
|
---|
2304 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2305 | return rc;
|
---|
2306 | }
|
---|
2307 |
|
---|
2308 | /** @copydoc VDIMAGEBACKEND::pfnSetParentFilename */
|
---|
2309 | static DECLCALLBACK(int) qcowSetParentFilename(void *pBackendData, const char *pszParentFilename)
|
---|
2310 | {
|
---|
2311 | int rc = VINF_SUCCESS;
|
---|
2312 | PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
|
---|
2313 |
|
---|
2314 | AssertPtr(pImage);
|
---|
2315 | if (pImage)
|
---|
2316 | {
|
---|
2317 | if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
|
---|
2318 | rc = VERR_VD_IMAGE_READ_ONLY;
|
---|
2319 | else if ( pImage->pszBackingFilename
|
---|
2320 | && (strlen(pszParentFilename) > pImage->cbBackingFilename))
|
---|
2321 | rc = VERR_NOT_SUPPORTED; /* The new filename is longer than the old one. */
|
---|
2322 | else
|
---|
2323 | {
|
---|
2324 | if (pImage->pszBackingFilename)
|
---|
2325 | RTStrFree(pImage->pszBackingFilename);
|
---|
2326 | pImage->pszBackingFilename = RTStrDup(pszParentFilename);
|
---|
2327 | if (!pImage->pszBackingFilename)
|
---|
2328 | rc = VERR_NO_MEMORY;
|
---|
2329 | else
|
---|
2330 | {
|
---|
2331 | if (!pImage->offBackingFilename)
|
---|
2332 | {
|
---|
2333 | /* Allocate new cluster. */
|
---|
2334 | uint64_t offData = qcowClusterAllocate(pImage, 1);
|
---|
2335 |
|
---|
2336 | Assert((offData & UINT32_MAX) == offData);
|
---|
2337 | pImage->offBackingFilename = (uint32_t)offData;
|
---|
2338 | pImage->cbBackingFilename = (uint32_t)strlen(pszParentFilename);
|
---|
2339 | rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
|
---|
2340 | offData + pImage->cbCluster);
|
---|
2341 | }
|
---|
2342 |
|
---|
2343 | if (RT_SUCCESS(rc))
|
---|
2344 | rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
|
---|
2345 | pImage->offBackingFilename,
|
---|
2346 | pImage->pszBackingFilename,
|
---|
2347 | strlen(pImage->pszBackingFilename));
|
---|
2348 | }
|
---|
2349 | }
|
---|
2350 | }
|
---|
2351 | else
|
---|
2352 | rc = VERR_VD_NOT_OPENED;
|
---|
2353 |
|
---|
2354 | LogFlowFunc(("returns %Rrc\n", rc));
|
---|
2355 | return rc;
|
---|
2356 | }
|
---|
2357 |
|
---|
2358 |
|
---|
2359 |
|
---|
2360 | const VDIMAGEBACKEND g_QCowBackend =
|
---|
2361 | {
|
---|
2362 | /* u32Version */
|
---|
2363 | VD_IMGBACKEND_VERSION,
|
---|
2364 | /* pszBackendName */
|
---|
2365 | "QCOW",
|
---|
2366 | /* uBackendCaps */
|
---|
2367 | VD_CAP_FILE | VD_CAP_VFS | VD_CAP_CREATE_DYNAMIC | VD_CAP_DIFF | VD_CAP_ASYNC,
|
---|
2368 | /* paFileExtensions */
|
---|
2369 | s_aQCowFileExtensions,
|
---|
2370 | /* paConfigInfo */
|
---|
2371 | NULL,
|
---|
2372 | /* pfnProbe */
|
---|
2373 | qcowProbe,
|
---|
2374 | /* pfnOpen */
|
---|
2375 | qcowOpen,
|
---|
2376 | /* pfnCreate */
|
---|
2377 | qcowCreate,
|
---|
2378 | /* pfnRename */
|
---|
2379 | qcowRename,
|
---|
2380 | /* pfnClose */
|
---|
2381 | qcowClose,
|
---|
2382 | /* pfnRead */
|
---|
2383 | qcowRead,
|
---|
2384 | /* pfnWrite */
|
---|
2385 | qcowWrite,
|
---|
2386 | /* pfnFlush */
|
---|
2387 | qcowFlush,
|
---|
2388 | /* pfnDiscard */
|
---|
2389 | NULL,
|
---|
2390 | /* pfnGetVersion */
|
---|
2391 | qcowGetVersion,
|
---|
2392 | /* pfnGetFileSize */
|
---|
2393 | qcowGetFileSize,
|
---|
2394 | /* pfnGetPCHSGeometry */
|
---|
2395 | qcowGetPCHSGeometry,
|
---|
2396 | /* pfnSetPCHSGeometry */
|
---|
2397 | qcowSetPCHSGeometry,
|
---|
2398 | /* pfnGetLCHSGeometry */
|
---|
2399 | qcowGetLCHSGeometry,
|
---|
2400 | /* pfnSetLCHSGeometry */
|
---|
2401 | qcowSetLCHSGeometry,
|
---|
2402 | /* pfnQueryRegions */
|
---|
2403 | qcowQueryRegions,
|
---|
2404 | /* pfnRegionListRelease */
|
---|
2405 | qcowRegionListRelease,
|
---|
2406 | /* pfnGetImageFlags */
|
---|
2407 | qcowGetImageFlags,
|
---|
2408 | /* pfnGetOpenFlags */
|
---|
2409 | qcowGetOpenFlags,
|
---|
2410 | /* pfnSetOpenFlags */
|
---|
2411 | qcowSetOpenFlags,
|
---|
2412 | /* pfnGetComment */
|
---|
2413 | qcowGetComment,
|
---|
2414 | /* pfnSetComment */
|
---|
2415 | qcowSetComment,
|
---|
2416 | /* pfnGetUuid */
|
---|
2417 | qcowGetUuid,
|
---|
2418 | /* pfnSetUuid */
|
---|
2419 | qcowSetUuid,
|
---|
2420 | /* pfnGetModificationUuid */
|
---|
2421 | qcowGetModificationUuid,
|
---|
2422 | /* pfnSetModificationUuid */
|
---|
2423 | qcowSetModificationUuid,
|
---|
2424 | /* pfnGetParentUuid */
|
---|
2425 | qcowGetParentUuid,
|
---|
2426 | /* pfnSetParentUuid */
|
---|
2427 | qcowSetParentUuid,
|
---|
2428 | /* pfnGetParentModificationUuid */
|
---|
2429 | qcowGetParentModificationUuid,
|
---|
2430 | /* pfnSetParentModificationUuid */
|
---|
2431 | qcowSetParentModificationUuid,
|
---|
2432 | /* pfnDump */
|
---|
2433 | qcowDump,
|
---|
2434 | /* pfnGetTimestamp */
|
---|
2435 | NULL,
|
---|
2436 | /* pfnGetParentTimestamp */
|
---|
2437 | NULL,
|
---|
2438 | /* pfnSetParentTimestamp */
|
---|
2439 | NULL,
|
---|
2440 | /* pfnGetParentFilename */
|
---|
2441 | qcowGetParentFilename,
|
---|
2442 | /* pfnSetParentFilename */
|
---|
2443 | qcowSetParentFilename,
|
---|
2444 | /* pfnComposeLocation */
|
---|
2445 | genericFileComposeLocation,
|
---|
2446 | /* pfnComposeName */
|
---|
2447 | genericFileComposeName,
|
---|
2448 | /* pfnCompact */
|
---|
2449 | NULL,
|
---|
2450 | /* pfnResize */
|
---|
2451 | NULL,
|
---|
2452 | /* pfnRepair */
|
---|
2453 | NULL,
|
---|
2454 | /* pfnTraverseMetadata */
|
---|
2455 | NULL,
|
---|
2456 | /* u32VersionEnd */
|
---|
2457 | VD_IMGBACKEND_VERSION
|
---|
2458 | };
|
---|