1 | /* $Id: VDVfs.cpp 66250 2017-03-26 21:52:17Z vboxsync $ */
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2 | /** @file
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3 | * Virtual Disk Container implementation. - VFS glue.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2012-2016 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 | #include <iprt/types.h>
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23 | #include <iprt/assert.h>
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24 | #include <iprt/mem.h>
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25 | #include <iprt/err.h>
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26 | #include <iprt/asm.h>
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27 | #include <iprt/string.h>
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28 | #include <iprt/file.h>
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29 | #include <iprt/sg.h>
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30 | #include <iprt/vfslowlevel.h>
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31 | #include <iprt/poll.h>
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32 | #include <VBox/vd.h>
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33 |
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34 |
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35 | /*********************************************************************************************************************************
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36 | * Structures and Typedefs *
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37 | *********************************************************************************************************************************/
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38 |
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39 | /**
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40 | * The internal data of a DVM volume I/O stream.
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41 | */
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42 | typedef struct VDVFSFILE
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43 | {
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44 | /** The volume the VFS file belongs to. */
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45 | PVDISK pDisk;
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46 | /** Current position. */
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47 | uint64_t offCurPos;
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48 | /** Flags given during creation. */
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49 | uint32_t fFlags;
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50 | } VDVFSFILE;
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51 | /** Pointer to a the internal data of a DVM volume file. */
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52 | typedef VDVFSFILE *PVDVFSFILE;
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53 |
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54 | /**
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55 | * VD read helper taking care of unaligned accesses.
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56 | *
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57 | * @return VBox status code.
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58 | * @param pDisk VD disk container.
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59 | * @param off Offset to start reading from.
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60 | * @param pvBuf Pointer to the buffer to read into.
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61 | * @param cbRead Amount of bytes to read.
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62 | */
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63 | static int vdReadHelper(PVDISK pDisk, uint64_t off, void *pvBuf, size_t cbRead)
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64 | {
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65 | int rc = VINF_SUCCESS;
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66 |
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67 | /* Take shortcut if possible. */
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68 | if ( off % 512 == 0
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69 | && cbRead % 512 == 0)
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70 | rc = VDRead(pDisk, off, pvBuf, cbRead);
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71 | else
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72 | {
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73 | uint8_t *pbBuf = (uint8_t *)pvBuf;
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74 | uint8_t abBuf[512];
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75 |
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76 | /* Unaligned access, make it aligned. */
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77 | if (off % 512 != 0)
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78 | {
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79 | uint64_t offAligned = off & ~(uint64_t)(512 - 1);
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80 | size_t cbToCopy = 512 - (off - offAligned);
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81 | rc = VDRead(pDisk, offAligned, abBuf, 512);
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82 | if (RT_SUCCESS(rc))
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83 | {
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84 | memcpy(pbBuf, &abBuf[off - offAligned], cbToCopy);
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85 | pbBuf += cbToCopy;
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86 | off += cbToCopy;
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87 | cbRead -= cbToCopy;
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88 | }
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89 | }
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90 |
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91 | if ( RT_SUCCESS(rc)
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92 | && (cbRead & ~(uint64_t)(512 - 1)))
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93 | {
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94 | size_t cbReadAligned = cbRead & ~(uint64_t)(512 - 1);
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95 |
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96 | Assert(!(off % 512));
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97 | rc = VDRead(pDisk, off, pbBuf, cbReadAligned);
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98 | if (RT_SUCCESS(rc))
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99 | {
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100 | pbBuf += cbReadAligned;
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101 | off += cbReadAligned;
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102 | cbRead -= cbReadAligned;
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103 | }
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104 | }
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105 |
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106 | if ( RT_SUCCESS(rc)
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107 | && cbRead)
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108 | {
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109 | Assert(cbRead < 512);
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110 | Assert(!(off % 512));
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111 |
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112 | rc = VDRead(pDisk, off, abBuf, 512);
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113 | if (RT_SUCCESS(rc))
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114 | memcpy(pbBuf, abBuf, cbRead);
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115 | }
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116 | }
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117 |
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118 | return rc;
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119 | }
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120 |
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121 |
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122 | /**
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123 | * VD write helper taking care of unaligned accesses.
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124 | *
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125 | * @return VBox status code.
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126 | * @param pDisk VD disk container.
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127 | * @param off Offset to start writing to.
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128 | * @param pvBuf Pointer to the buffer to read from.
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129 | * @param cbWrite Amount of bytes to write.
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130 | */
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131 | static int vdWriteHelper(PVDISK pDisk, uint64_t off, const void *pvBuf, size_t cbWrite)
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132 | {
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133 | int rc = VINF_SUCCESS;
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134 |
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135 | /* Take shortcut if possible. */
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136 | if ( off % 512 == 0
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137 | && cbWrite % 512 == 0)
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138 | rc = VDWrite(pDisk, off, pvBuf, cbWrite);
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139 | else
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140 | {
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141 | uint8_t *pbBuf = (uint8_t *)pvBuf;
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142 | uint8_t abBuf[512];
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143 |
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144 | /* Unaligned access, make it aligned. */
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145 | if (off % 512 != 0)
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146 | {
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147 | uint64_t offAligned = off & ~(uint64_t)(512 - 1);
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148 | size_t cbToCopy = 512 - (off - offAligned);
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149 | rc = VDRead(pDisk, offAligned, abBuf, 512);
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150 | if (RT_SUCCESS(rc))
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151 | {
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152 | memcpy(&abBuf[off - offAligned], pbBuf, cbToCopy);
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153 | rc = VDWrite(pDisk, offAligned, abBuf, 512);
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154 |
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155 | pbBuf += cbToCopy;
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156 | off += cbToCopy;
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157 | cbWrite -= cbToCopy;
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158 | }
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159 | }
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160 |
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161 | if ( RT_SUCCESS(rc)
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162 | && (cbWrite & ~(uint64_t)(512 - 1)))
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163 | {
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164 | size_t cbWriteAligned = cbWrite & ~(uint64_t)(512 - 1);
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165 |
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166 | Assert(!(off % 512));
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167 | rc = VDWrite(pDisk, off, pbBuf, cbWriteAligned);
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168 | if (RT_SUCCESS(rc))
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169 | {
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170 | pbBuf += cbWriteAligned;
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171 | off += cbWriteAligned;
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172 | cbWrite -= cbWriteAligned;
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173 | }
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174 | }
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175 |
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176 | if ( RT_SUCCESS(rc)
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177 | && cbWrite)
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178 | {
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179 | Assert(cbWrite < 512);
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180 | Assert(!(off % 512));
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181 |
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182 | rc = VDRead(pDisk, off, abBuf, 512);
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183 | if (RT_SUCCESS(rc))
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184 | {
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185 | memcpy(abBuf, pbBuf, cbWrite);
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186 | rc = VDWrite(pDisk, off, abBuf, 512);
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187 | }
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188 | }
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189 | }
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190 |
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191 | return rc;
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192 | }
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193 |
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194 |
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195 | /**
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196 | * @interface_method_impl{RTVFSOBJOPS,pfnClose}
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197 | */
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198 | static DECLCALLBACK(int) vdVfsFile_Close(void *pvThis)
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199 | {
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200 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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201 |
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202 | if (pThis->fFlags & VD_VFSFILE_DESTROY_ON_RELEASE)
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203 | VDDestroy(pThis->pDisk);
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204 |
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205 | return VINF_SUCCESS;
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206 | }
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207 |
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208 |
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209 | /**
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210 | * @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
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211 | */
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212 | static DECLCALLBACK(int) vdVfsFile_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo,
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213 | RTFSOBJATTRADD enmAddAttr)
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214 | {
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215 | NOREF(pvThis);
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216 | NOREF(pObjInfo);
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217 | NOREF(enmAddAttr);
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218 | return VERR_NOT_SUPPORTED;
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219 | }
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220 |
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221 |
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222 | /**
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223 | * @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead}
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224 | */
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225 | static DECLCALLBACK(int) vdVfsFile_Read(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbRead)
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226 | {
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227 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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228 | int rc = VINF_SUCCESS;
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229 |
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230 | Assert(pSgBuf->cSegs == 1);
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231 | NOREF(fBlocking);
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232 |
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233 | /*
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234 | * Find the current position and check if it's within the volume.
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235 | */
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236 | uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off;
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237 | if (offUnsigned >= VDGetSize(pThis->pDisk, VD_LAST_IMAGE))
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238 | {
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239 | if (pcbRead)
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240 | {
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241 | *pcbRead = 0;
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242 | pThis->offCurPos = offUnsigned;
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243 | return VINF_EOF;
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244 | }
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245 | return VERR_EOF;
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246 | }
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247 |
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248 | size_t cbLeftToRead;
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249 | if (offUnsigned + pSgBuf->paSegs[0].cbSeg > VDGetSize(pThis->pDisk, VD_LAST_IMAGE))
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250 | {
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251 | if (!pcbRead)
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252 | return VERR_EOF;
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253 | *pcbRead = cbLeftToRead = (size_t)(VDGetSize(pThis->pDisk, VD_LAST_IMAGE) - offUnsigned);
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254 | }
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255 | else
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256 | {
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257 | cbLeftToRead = pSgBuf->paSegs[0].cbSeg;
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258 | if (pcbRead)
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259 | *pcbRead = cbLeftToRead;
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260 | }
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261 |
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262 | /*
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263 | * Ok, we've got a valid stretch within the file. Do the reading.
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264 | */
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265 | if (cbLeftToRead > 0)
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266 | {
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267 | rc = vdReadHelper(pThis->pDisk, (uint64_t)off, pSgBuf->paSegs[0].pvSeg, cbLeftToRead);
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268 | if (RT_SUCCESS(rc))
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269 | offUnsigned += cbLeftToRead;
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270 | }
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271 |
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272 | pThis->offCurPos = offUnsigned;
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273 | return rc;
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274 | }
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275 |
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276 |
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277 | /**
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278 | * @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite}
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279 | */
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280 | static DECLCALLBACK(int) vdVfsFile_Write(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbWritten)
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281 | {
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282 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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283 | int rc = VINF_SUCCESS;
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284 |
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285 | Assert(pSgBuf->cSegs == 1);
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286 | NOREF(fBlocking);
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287 |
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288 | /*
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289 | * Find the current position and check if it's within the volume.
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290 | * Writing beyond the end of a volume is not supported.
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291 | */
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292 | uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off;
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293 | if (offUnsigned >= VDGetSize(pThis->pDisk, VD_LAST_IMAGE))
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294 | {
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295 | if (pcbWritten)
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296 | {
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297 | *pcbWritten = 0;
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298 | pThis->offCurPos = offUnsigned;
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299 | }
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300 | return VERR_NOT_SUPPORTED;
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301 | }
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302 |
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303 | size_t cbLeftToWrite;
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304 | if (offUnsigned + pSgBuf->paSegs[0].cbSeg > VDGetSize(pThis->pDisk, VD_LAST_IMAGE))
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305 | {
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306 | if (!pcbWritten)
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307 | return VERR_EOF;
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308 | *pcbWritten = cbLeftToWrite = (size_t)(VDGetSize(pThis->pDisk, VD_LAST_IMAGE) - offUnsigned);
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309 | }
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310 | else
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311 | {
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312 | cbLeftToWrite = pSgBuf->paSegs[0].cbSeg;
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313 | if (pcbWritten)
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314 | *pcbWritten = cbLeftToWrite;
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315 | }
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316 |
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317 | /*
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318 | * Ok, we've got a valid stretch within the file. Do the reading.
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319 | */
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320 | if (cbLeftToWrite > 0)
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321 | {
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322 | rc = vdWriteHelper(pThis->pDisk, (uint64_t)off, pSgBuf->paSegs[0].pvSeg, cbLeftToWrite);
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323 | if (RT_SUCCESS(rc))
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324 | offUnsigned += cbLeftToWrite;
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325 | }
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326 |
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327 | pThis->offCurPos = offUnsigned;
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328 | return rc;
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329 | }
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330 |
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331 |
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332 | /**
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333 | * @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush}
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334 | */
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335 | static DECLCALLBACK(int) vdVfsFile_Flush(void *pvThis)
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336 | {
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337 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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338 | return VDFlush(pThis->pDisk);
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339 | }
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340 |
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341 |
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342 | /**
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343 | * @interface_method_impl{RTVFSIOSTREAMOPS,pfnPollOne}
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344 | */
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345 | static DECLCALLBACK(int) vdVfsFile_PollOne(void *pvThis, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
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346 | uint32_t *pfRetEvents)
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347 | {
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348 | NOREF(pvThis);
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349 | int rc;
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350 | if (fEvents != RTPOLL_EVT_ERROR)
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351 | {
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352 | *pfRetEvents = fEvents & ~RTPOLL_EVT_ERROR;
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353 | rc = VINF_SUCCESS;
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354 | }
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355 | else
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356 | rc = RTVfsUtilDummyPollOne(fEvents, cMillies, fIntr, pfRetEvents);
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357 | return rc;
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358 | }
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359 |
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360 |
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361 | /**
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362 | * @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell}
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363 | */
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364 | static DECLCALLBACK(int) vdVfsFile_Tell(void *pvThis, PRTFOFF poffActual)
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365 | {
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366 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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367 | *poffActual = pThis->offCurPos;
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368 | return VINF_SUCCESS;
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369 | }
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370 |
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371 |
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372 | /**
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373 | * @interface_method_impl{RTVFSOBJSETOPS,pfnSetMode}
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374 | */
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375 | static DECLCALLBACK(int) vdVfsFile_SetMode(void *pvThis, RTFMODE fMode, RTFMODE fMask)
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376 | {
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377 | NOREF(pvThis);
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378 | NOREF(fMode);
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379 | NOREF(fMask);
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380 | return VERR_NOT_SUPPORTED;
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381 | }
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382 |
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383 |
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384 | /**
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385 | * @interface_method_impl{RTVFSOBJSETOPS,pfnSetTimes}
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386 | */
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387 | static DECLCALLBACK(int) vdVfsFile_SetTimes(void *pvThis, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
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388 | PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
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389 | {
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390 | NOREF(pvThis);
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391 | NOREF(pAccessTime);
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392 | NOREF(pModificationTime);
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393 | NOREF(pChangeTime);
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394 | NOREF(pBirthTime);
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395 | return VERR_NOT_SUPPORTED;
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396 | }
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397 |
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398 |
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399 | /**
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400 | * @interface_method_impl{RTVFSOBJSETOPS,pfnSetOwner}
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401 | */
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402 | static DECLCALLBACK(int) vdVfsFile_SetOwner(void *pvThis, RTUID uid, RTGID gid)
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403 | {
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404 | NOREF(pvThis);
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405 | NOREF(uid);
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406 | NOREF(gid);
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407 | return VERR_NOT_SUPPORTED;
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408 | }
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409 |
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410 |
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411 | /**
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412 | * @interface_method_impl{RTVFSFILEOPS,pfnSeek}
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413 | */
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414 | static DECLCALLBACK(int) vdVfsFile_Seek(void *pvThis, RTFOFF offSeek, unsigned uMethod, PRTFOFF poffActual)
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415 | {
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416 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
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417 |
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418 | /*
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419 | * Seek relative to which position.
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420 | */
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421 | uint64_t offWrt;
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422 | switch (uMethod)
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423 | {
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424 | case RTFILE_SEEK_BEGIN:
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425 | offWrt = 0;
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426 | break;
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427 |
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428 | case RTFILE_SEEK_CURRENT:
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429 | offWrt = pThis->offCurPos;
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430 | break;
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431 |
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432 | case RTFILE_SEEK_END:
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433 | offWrt = VDGetSize(pThis->pDisk, VD_LAST_IMAGE);
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434 | break;
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435 |
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436 | default:
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437 | return VERR_INTERNAL_ERROR_5;
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438 | }
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439 |
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440 | /*
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441 | * Calc new position, take care to stay within bounds.
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442 | *
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443 | * @todo: Setting position beyond the end of the disk does not make sense.
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444 | */
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445 | uint64_t offNew;
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446 | if (offSeek == 0)
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447 | offNew = offWrt;
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448 | else if (offSeek > 0)
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449 | {
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450 | offNew = offWrt + offSeek;
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451 | if ( offNew < offWrt
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452 | || offNew > RTFOFF_MAX)
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453 | offNew = RTFOFF_MAX;
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454 | }
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455 | else if ((uint64_t)-offSeek < offWrt)
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456 | offNew = offWrt + offSeek;
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457 | else
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458 | offNew = 0;
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459 |
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460 | /*
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461 | * Update the state and set return value.
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462 | */
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463 | pThis->offCurPos = offNew;
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464 |
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465 | *poffActual = offNew;
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466 | return VINF_SUCCESS;
|
---|
467 | }
|
---|
468 |
|
---|
469 |
|
---|
470 | /**
|
---|
471 | * @interface_method_impl{RTVFSFILEOPS,pfnQuerySize}
|
---|
472 | */
|
---|
473 | static DECLCALLBACK(int) vdVfsFile_QuerySize(void *pvThis, uint64_t *pcbFile)
|
---|
474 | {
|
---|
475 | PVDVFSFILE pThis = (PVDVFSFILE)pvThis;
|
---|
476 | *pcbFile = VDGetSize(pThis->pDisk, VD_LAST_IMAGE);
|
---|
477 | return VINF_SUCCESS;
|
---|
478 | }
|
---|
479 |
|
---|
480 |
|
---|
481 | /**
|
---|
482 | * Standard file operations.
|
---|
483 | */
|
---|
484 | DECL_HIDDEN_CONST(const RTVFSFILEOPS) g_vdVfsStdFileOps =
|
---|
485 | {
|
---|
486 | { /* Stream */
|
---|
487 | { /* Obj */
|
---|
488 | RTVFSOBJOPS_VERSION,
|
---|
489 | RTVFSOBJTYPE_FILE,
|
---|
490 | "VDFile",
|
---|
491 | vdVfsFile_Close,
|
---|
492 | vdVfsFile_QueryInfo,
|
---|
493 | RTVFSOBJOPS_VERSION
|
---|
494 | },
|
---|
495 | RTVFSIOSTREAMOPS_VERSION,
|
---|
496 | RTVFSIOSTREAMOPS_FEAT_NO_SG,
|
---|
497 | vdVfsFile_Read,
|
---|
498 | vdVfsFile_Write,
|
---|
499 | vdVfsFile_Flush,
|
---|
500 | vdVfsFile_PollOne,
|
---|
501 | vdVfsFile_Tell,
|
---|
502 | NULL /*Skip*/,
|
---|
503 | NULL /*ZeroFill*/,
|
---|
504 | RTVFSIOSTREAMOPS_VERSION,
|
---|
505 | },
|
---|
506 | RTVFSFILEOPS_VERSION,
|
---|
507 | /*RTVFSIOFILEOPS_FEAT_NO_AT_OFFSET*/ 0,
|
---|
508 | { /* ObjSet */
|
---|
509 | RTVFSOBJSETOPS_VERSION,
|
---|
510 | RT_OFFSETOF(RTVFSFILEOPS, Stream.Obj) - RT_OFFSETOF(RTVFSFILEOPS, ObjSet),
|
---|
511 | vdVfsFile_SetMode,
|
---|
512 | vdVfsFile_SetTimes,
|
---|
513 | vdVfsFile_SetOwner,
|
---|
514 | RTVFSOBJSETOPS_VERSION
|
---|
515 | },
|
---|
516 | vdVfsFile_Seek,
|
---|
517 | vdVfsFile_QuerySize,
|
---|
518 | RTVFSFILEOPS_VERSION
|
---|
519 | };
|
---|
520 |
|
---|
521 |
|
---|
522 | VBOXDDU_DECL(int) VDCreateVfsFileFromDisk(PVDISK pDisk, uint32_t fFlags,
|
---|
523 | PRTVFSFILE phVfsFile)
|
---|
524 | {
|
---|
525 | AssertPtrReturn(pDisk, VERR_INVALID_HANDLE);
|
---|
526 | AssertPtrReturn(phVfsFile, VERR_INVALID_POINTER);
|
---|
527 | AssertReturn((fFlags & ~VD_VFSFILE_FLAGS_MASK) == 0, VERR_INVALID_PARAMETER);
|
---|
528 |
|
---|
529 | /*
|
---|
530 | * Create the volume file.
|
---|
531 | */
|
---|
532 | RTVFSFILE hVfsFile;
|
---|
533 | PVDVFSFILE pThis;
|
---|
534 | int rc = RTVfsNewFile(&g_vdVfsStdFileOps, sizeof(*pThis), RTFILE_O_OPEN | RTFILE_O_READ | RTFILE_O_WRITE,
|
---|
535 | NIL_RTVFS, NIL_RTVFSLOCK, &hVfsFile, (void **)&pThis);
|
---|
536 | if (RT_SUCCESS(rc))
|
---|
537 | {
|
---|
538 | pThis->offCurPos = 0;
|
---|
539 | pThis->pDisk = pDisk;
|
---|
540 | pThis->fFlags = fFlags;
|
---|
541 |
|
---|
542 | *phVfsFile = hVfsFile;
|
---|
543 | return VINF_SUCCESS;
|
---|
544 | }
|
---|
545 |
|
---|
546 | return rc;
|
---|
547 | }
|
---|
548 |
|
---|