1 | /* $Id: PDMAsyncCompletionFileNormal.cpp 26689 2010-02-22 22:11:38Z vboxsync $ */
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2 | /** @file
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3 | * PDM Async I/O - Transport data asynchronous in R3 using EMT.
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4 | * Async File I/O manager.
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5 | */
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6 |
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7 | /*
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8 | * Copyright (C) 2006-2008 Sun Microsystems, Inc.
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9 | *
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10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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11 | * available from http://www.virtualbox.org. This file is free software;
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12 | * you can redistribute it and/or modify it under the terms of the GNU
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13 | * General Public License (GPL) as published by the Free Software
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14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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17 | *
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18 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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19 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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20 | * additional information or have any questions.
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21 | */
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22 | #define LOG_GROUP LOG_GROUP_PDM_ASYNC_COMPLETION
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23 | #include <iprt/types.h>
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24 | #include <iprt/asm.h>
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25 | #include <iprt/file.h>
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26 | #include <iprt/mem.h>
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27 | #include <iprt/string.h>
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28 | #include <iprt/assert.h>
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29 | #include <VBox/log.h>
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30 |
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31 | #include "PDMAsyncCompletionFileInternal.h"
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32 |
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33 | /** The update period for the I/O load statistics in ms. */
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34 | #define PDMACEPFILEMGR_LOAD_UPDATE_PERIOD 1000
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35 | /** Maximum number of requests a manager will handle. */
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36 | #define PDMACEPFILEMGR_REQS_MAX 512 /* @todo: Find better solution wrt. the request number*/
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37 |
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38 | /*******************************************************************************
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39 | * Internal functions *
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40 | *******************************************************************************/
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41 | static int pdmacFileAioMgrNormalProcessTaskList(PPDMACTASKFILE pTaskHead,
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42 | PPDMACEPFILEMGR pAioMgr,
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43 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
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44 |
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45 |
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46 | int pdmacFileAioMgrNormalInit(PPDMACEPFILEMGR pAioMgr)
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47 | {
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48 | int rc = VINF_SUCCESS;
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49 |
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50 | rc = RTFileAioCtxCreate(&pAioMgr->hAioCtx, RTFILEAIO_UNLIMITED_REQS);
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51 | if (rc == VERR_OUT_OF_RANGE)
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52 | rc = RTFileAioCtxCreate(&pAioMgr->hAioCtx, PDMACEPFILEMGR_REQS_MAX);
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53 |
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54 | if (RT_SUCCESS(rc))
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55 | {
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56 | /* Initialize request handle array. */
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57 | pAioMgr->iFreeEntryNext = 0;
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58 | pAioMgr->iFreeReqNext = 0;
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59 | pAioMgr->cReqEntries = PDMACEPFILEMGR_REQS_MAX + 1;
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60 | pAioMgr->pahReqsFree = (RTFILEAIOREQ *)RTMemAllocZ(pAioMgr->cReqEntries * sizeof(RTFILEAIOREQ));
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61 |
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62 | if (pAioMgr->pahReqsFree)
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63 | {
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64 | return VINF_SUCCESS;
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65 | }
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66 | else
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67 | {
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68 | RTFileAioCtxDestroy(pAioMgr->hAioCtx);
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69 | rc = VERR_NO_MEMORY;
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70 | }
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71 | }
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72 |
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73 | return rc;
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74 | }
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75 |
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76 | void pdmacFileAioMgrNormalDestroy(PPDMACEPFILEMGR pAioMgr)
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77 | {
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78 | RTFileAioCtxDestroy(pAioMgr->hAioCtx);
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79 |
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80 | while (pAioMgr->iFreeReqNext != pAioMgr->iFreeEntryNext)
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81 | {
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82 | RTFileAioReqDestroy(pAioMgr->pahReqsFree[pAioMgr->iFreeReqNext]);
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83 | pAioMgr->iFreeReqNext = (pAioMgr->iFreeReqNext + 1) % pAioMgr->cReqEntries;
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84 | }
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85 |
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86 | RTMemFree(pAioMgr->pahReqsFree);
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87 | }
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88 |
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89 | /**
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90 | * Sorts the endpoint list with insertion sort.
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91 | */
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92 | static void pdmacFileAioMgrNormalEndpointsSortByLoad(PPDMACEPFILEMGR pAioMgr)
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93 | {
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94 | PPDMASYNCCOMPLETIONENDPOINTFILE pEpPrev, pEpCurr, pEpNextToSort;
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95 |
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96 | pEpPrev = pAioMgr->pEndpointsHead;
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97 | pEpCurr = pEpPrev->AioMgr.pEndpointNext;
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98 |
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99 | while (pEpCurr)
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100 | {
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101 | /* Remember the next element to sort because the list might change. */
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102 | pEpNextToSort = pEpCurr->AioMgr.pEndpointNext;
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103 |
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104 | /* Unlink the current element from the list. */
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105 | PPDMASYNCCOMPLETIONENDPOINTFILE pPrev = pEpCurr->AioMgr.pEndpointPrev;
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106 | PPDMASYNCCOMPLETIONENDPOINTFILE pNext = pEpCurr->AioMgr.pEndpointNext;
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107 |
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108 | if (pPrev)
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109 | pPrev->AioMgr.pEndpointNext = pNext;
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110 | else
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111 | pAioMgr->pEndpointsHead = pNext;
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112 |
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113 | if (pNext)
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114 | pNext->AioMgr.pEndpointPrev = pPrev;
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115 |
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116 | /* Go back until we reached the place to insert the current endpoint into. */
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117 | while (pEpPrev && (pEpPrev->AioMgr.cReqsPerSec < pEpCurr->AioMgr.cReqsPerSec))
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118 | pEpPrev = pEpPrev->AioMgr.pEndpointPrev;
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119 |
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120 | /* Link the endpoint into the list. */
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121 | if (pEpPrev)
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122 | pNext = pEpPrev->AioMgr.pEndpointNext;
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123 | else
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124 | pNext = pAioMgr->pEndpointsHead;
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125 |
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126 | pEpCurr->AioMgr.pEndpointNext = pNext;
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127 | pEpCurr->AioMgr.pEndpointPrev = pEpPrev;
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128 |
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129 | if (pNext)
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130 | pNext->AioMgr.pEndpointPrev = pEpCurr;
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131 |
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132 | if (pEpPrev)
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133 | pEpPrev->AioMgr.pEndpointNext = pEpCurr;
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134 | else
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135 | pAioMgr->pEndpointsHead = pEpCurr;
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136 |
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137 | pEpCurr = pEpNextToSort;
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138 | }
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139 |
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140 | #ifdef DEBUG
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141 | /* Validate sorting alogrithm */
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142 | unsigned cEndpoints = 0;
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143 | pEpCurr = pAioMgr->pEndpointsHead;
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144 |
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145 | AssertMsg(pEpCurr, ("No endpoint in the list?\n"));
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146 | AssertMsg(!pEpCurr->AioMgr.pEndpointPrev, ("First element in the list points to previous element\n"));
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147 |
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148 | while (pEpCurr)
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149 | {
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150 | cEndpoints++;
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151 |
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152 | PPDMASYNCCOMPLETIONENDPOINTFILE pNext = pEpCurr->AioMgr.pEndpointNext;
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153 | PPDMASYNCCOMPLETIONENDPOINTFILE pPrev = pEpCurr->AioMgr.pEndpointPrev;
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154 |
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155 | Assert(!pNext || pNext->AioMgr.cReqsPerSec <= pEpCurr->AioMgr.cReqsPerSec);
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156 | Assert(!pPrev || pPrev->AioMgr.cReqsPerSec >= pEpCurr->AioMgr.cReqsPerSec);
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157 |
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158 | pEpCurr = pNext;
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159 | }
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160 |
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161 | AssertMsg(cEndpoints == pAioMgr->cEndpoints, ("Endpoints lost during sort!\n"));
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162 |
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163 | #endif
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164 | }
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165 |
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166 | /**
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167 | * Removes an endpoint from the currently assigned manager.
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168 | *
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169 | * @returns TRUE if there are still requests pending on the current manager for this endpoint.
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170 | * FALSE otherwise.
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171 | * @param pEndpointRemove The endpoint to remove.
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172 | */
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173 | static bool pdmacFileAioMgrNormalRemoveEndpoint(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointRemove)
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174 | {
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175 | PPDMASYNCCOMPLETIONENDPOINTFILE pPrev = pEndpointRemove->AioMgr.pEndpointPrev;
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176 | PPDMASYNCCOMPLETIONENDPOINTFILE pNext = pEndpointRemove->AioMgr.pEndpointNext;
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177 | PPDMACEPFILEMGR pAioMgr = pEndpointRemove->pAioMgr;
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178 |
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179 | pAioMgr->cEndpoints--;
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180 |
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181 | if (pPrev)
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182 | pPrev->AioMgr.pEndpointNext = pNext;
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183 | else
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184 | pAioMgr->pEndpointsHead = pNext;
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185 |
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186 | if (pNext)
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187 | pNext->AioMgr.pEndpointPrev = pPrev;
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188 |
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189 | /* Make sure that there is no request pending on this manager for the endpoint. */
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190 | if (!pEndpointRemove->AioMgr.cRequestsActive)
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191 | {
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192 | Assert(!pEndpointRemove->pFlushReq);
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193 |
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194 | /* Reopen the file so that the new endpoint can reassociate with the file */
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195 | RTFileClose(pEndpointRemove->File);
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196 | int rc = RTFileOpen(&pEndpointRemove->File, pEndpointRemove->Core.pszUri, pEndpointRemove->fFlags);
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197 | AssertRC(rc);
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198 | return false;
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199 | }
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200 |
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201 | return true;
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202 | }
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203 |
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204 | static bool pdmacFileAioMgrNormalIsBalancePossible(PPDMACEPFILEMGR pAioMgr)
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205 | {
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206 | /* Balancing doesn't make sense with only one endpoint. */
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207 | if (pAioMgr->cEndpoints == 1)
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208 | return false;
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209 |
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210 | /* Doesn't make sens to move endpoints if only one produces the whole load */
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211 | unsigned cEndpointsWithLoad = 0;
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212 |
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213 | PPDMASYNCCOMPLETIONENDPOINTFILE pCurr = pAioMgr->pEndpointsHead;
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214 |
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215 | while (pCurr)
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216 | {
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217 | if (pCurr->AioMgr.cReqsPerSec)
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218 | cEndpointsWithLoad++;
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219 |
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220 | pCurr = pCurr->AioMgr.pEndpointNext;
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221 | }
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222 |
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223 | return (cEndpointsWithLoad > 1);
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224 | }
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225 |
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226 | /**
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227 | * Creates a new I/O manager and spreads the I/O load of the endpoints
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228 | * between the given I/O manager and the new one.
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229 | *
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230 | * @returns nothing.
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231 | * @param pAioMgr The I/O manager with high I/O load.
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232 | */
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233 | static void pdmacFileAioMgrNormalBalanceLoad(PPDMACEPFILEMGR pAioMgr)
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234 | {
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235 | PPDMACEPFILEMGR pAioMgrNew = NULL;
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236 | int rc = VINF_SUCCESS;
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237 |
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238 | /*
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239 | * Check if balancing would improve the situation.
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240 | */
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241 | if (pdmacFileAioMgrNormalIsBalancePossible(pAioMgr))
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242 | {
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243 | rc = pdmacFileAioMgrCreate((PPDMASYNCCOMPLETIONEPCLASSFILE)pAioMgr->pEndpointsHead->Core.pEpClass,
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244 | &pAioMgrNew, false);
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245 | if (RT_SUCCESS(rc))
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246 | {
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247 | /* We will sort the list by request count per second. */
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248 | pdmacFileAioMgrNormalEndpointsSortByLoad(pAioMgr);
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249 |
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250 | /* Now move some endpoints to the new manager. */
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251 | unsigned cReqsHere = pAioMgr->pEndpointsHead->AioMgr.cReqsPerSec;
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252 | unsigned cReqsOther = 0;
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253 | PPDMASYNCCOMPLETIONENDPOINTFILE pCurr = pAioMgr->pEndpointsHead->AioMgr.pEndpointNext;
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254 |
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255 | while (pCurr)
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256 | {
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257 | if (cReqsHere <= cReqsOther)
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258 | {
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259 | /*
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260 | * The other manager has more requests to handle now.
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261 | * We will keep the current endpoint.
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262 | */
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263 | Log(("Keeping endpoint %#p{%s} with %u reqs/s\n", pCurr->Core.pszUri, pCurr->AioMgr.cReqsPerSec));
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264 | cReqsHere += pCurr->AioMgr.cReqsPerSec;
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265 | pCurr = pCurr->AioMgr.pEndpointNext;
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266 | }
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267 | else
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268 | {
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269 | /* Move to other endpoint. */
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270 | Log(("Moving endpoint %#p{%s} with %u reqs/s to other manager\n", pCurr, pCurr->Core.pszUri, pCurr->AioMgr.cReqsPerSec));
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271 | cReqsOther += pCurr->AioMgr.cReqsPerSec;
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272 |
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273 | PPDMASYNCCOMPLETIONENDPOINTFILE pMove = pCurr;
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274 |
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275 | pCurr = pCurr->AioMgr.pEndpointNext;
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276 |
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277 | bool fReqsPending = pdmacFileAioMgrNormalRemoveEndpoint(pMove);
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278 |
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279 | if (fReqsPending)
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280 | {
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281 | pMove->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_REMOVING;
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282 | pMove->AioMgr.fMoving = true;
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283 | pMove->AioMgr.pAioMgrDst = pAioMgrNew;
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284 | }
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285 | else
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286 | {
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287 | pMove->AioMgr.fMoving = false;
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288 | pMove->AioMgr.pAioMgrDst = NULL;
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289 | pdmacFileAioMgrAddEndpoint(pAioMgrNew, pMove);
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290 | }
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291 | }
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292 | }
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293 | }
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294 | else
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295 | {
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296 | /* Don't process further but leave a log entry about reduced performance. */
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297 | LogRel(("AIOMgr: Could not create new I/O manager (rc=%Rrc). Expect reduced performance\n", rc));
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298 | }
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299 | }
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300 | else
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301 | Log(("AIOMgr: Load balancing would not improve anything\n"));
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302 | }
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303 |
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304 | /**
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305 | * Error handler which will create the failsafe managers and destroy the failed I/O manager.
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306 | *
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307 | * @returns VBox status code
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308 | * @param pAioMgr The I/O manager the error ocurred on.
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309 | * @param rc The error code.
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310 | */
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311 | static int pdmacFileAioMgrNormalErrorHandler(PPDMACEPFILEMGR pAioMgr, int rc, RT_SRC_POS_DECL)
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312 | {
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313 | LogRel(("AIOMgr: I/O manager %#p encountered a critical error (rc=%Rrc) during operation. Falling back to failsafe mode. Expect reduced performance\n",
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314 | pAioMgr, rc));
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315 | LogRel(("AIOMgr: Error happened in %s:(%u){%s}\n", RT_SRC_POS_ARGS));
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316 | LogRel(("AIOMgr: Please contact the product vendor\n"));
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317 |
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318 | PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pAioMgr->pEndpointsHead->Core.pEpClass;
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319 |
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320 | pAioMgr->enmState = PDMACEPFILEMGRSTATE_FAULT;
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321 | ASMAtomicWriteBool(&pEpClassFile->fFailsafe, true);
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322 |
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323 | AssertMsgFailed(("Implement\n"));
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324 | return VINF_SUCCESS;
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325 | }
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326 |
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327 | /**
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328 | * Put a list of tasks in the pending request list of an endpoint.
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329 | */
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330 | DECLINLINE(void) pdmacFileAioMgrEpAddTaskList(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTaskHead)
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331 | {
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332 | /* Add the rest of the tasks to the pending list */
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333 | if (!pEndpoint->AioMgr.pReqsPendingHead)
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334 | {
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335 | Assert(!pEndpoint->AioMgr.pReqsPendingTail);
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336 | pEndpoint->AioMgr.pReqsPendingHead = pTaskHead;
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337 | }
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338 | else
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339 | {
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340 | Assert(pEndpoint->AioMgr.pReqsPendingTail);
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341 | pEndpoint->AioMgr.pReqsPendingTail->pNext = pTaskHead;
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342 | }
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343 |
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344 | /* Update the tail. */
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345 | while (pTaskHead->pNext)
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346 | pTaskHead = pTaskHead->pNext;
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347 |
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348 | pEndpoint->AioMgr.pReqsPendingTail = pTaskHead;
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349 | }
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350 |
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351 | /**
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352 | * Put one task in the pending request list of an endpoint.
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353 | */
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354 | DECLINLINE(void) pdmacFileAioMgrEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask)
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355 | {
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356 | /* Add the rest of the tasks to the pending list */
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357 | if (!pEndpoint->AioMgr.pReqsPendingHead)
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358 | {
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359 | Assert(!pEndpoint->AioMgr.pReqsPendingTail);
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360 | pEndpoint->AioMgr.pReqsPendingHead = pTask;
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361 | }
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362 | else
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363 | {
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364 | Assert(pEndpoint->AioMgr.pReqsPendingTail);
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365 | pEndpoint->AioMgr.pReqsPendingTail->pNext = pTask;
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366 | }
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367 |
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368 | pEndpoint->AioMgr.pReqsPendingTail = pTask;
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369 | }
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370 |
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371 | /**
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372 | * Wrapper around RTFIleAioCtxSubmit() which is also doing error handling.
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373 | */
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374 | static int pdmacFileAioMgrNormalReqsEnqueue(PPDMACEPFILEMGR pAioMgr,
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375 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
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376 | PRTFILEAIOREQ pahReqs, unsigned cReqs)
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377 | {
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378 | int rc;
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379 |
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380 | pAioMgr->cRequestsActive += cReqs;
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381 | pEndpoint->AioMgr.cRequestsActive += cReqs;
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382 |
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383 | LogFlow(("Enqueuing %d requests. I/O manager has a total of %d active requests now\n", cReqs, pAioMgr->cRequestsActive));
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384 | LogFlow(("Endpoint has a total of %d active requests now\n", pEndpoint->AioMgr.cRequestsActive));
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385 |
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386 | rc = RTFileAioCtxSubmit(pAioMgr->hAioCtx, pahReqs, cReqs);
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387 | if (RT_FAILURE(rc))
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388 | {
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389 | if (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES)
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390 | {
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391 | PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
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392 |
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393 | /*
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394 | * We run out of resources.
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395 | * Need to check which requests got queued
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396 | * and put the rest on the pending list again.
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397 | */
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398 | if (RT_UNLIKELY(!pEpClass->fOutOfResourcesWarningPrinted))
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399 | {
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400 | pEpClass->fOutOfResourcesWarningPrinted = true;
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401 | LogRel(("AIOMgr: The operating system doesn't have enough resources "
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402 | "to handle the I/O load of the VM. Expect reduced I/O performance\n"));
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403 | }
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404 |
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405 | for (size_t i = 0; i < cReqs; i++)
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406 | {
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407 | int rcReq = RTFileAioReqGetRC(pahReqs[i], NULL);
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408 |
|
---|
409 | if (rcReq != VERR_FILE_AIO_IN_PROGRESS)
|
---|
410 | {
|
---|
411 | AssertMsg(rcReq == VERR_FILE_AIO_NOT_SUBMITTED,
|
---|
412 | ("Request returned unexpected return code: rc=%Rrc\n", rcReq));
|
---|
413 |
|
---|
414 | PPDMACTASKFILE pTask = (PPDMACTASKFILE)RTFileAioReqGetUser(pahReqs[i]);
|
---|
415 |
|
---|
416 | /* Put the entry on the free array */
|
---|
417 | pAioMgr->pahReqsFree[pAioMgr->iFreeEntryNext] = pahReqs[i];
|
---|
418 | pAioMgr->iFreeEntryNext = (pAioMgr->iFreeEntryNext + 1) % pAioMgr->cReqEntries;
|
---|
419 |
|
---|
420 | pdmacFileAioMgrEpAddTask(pEndpoint, pTask);
|
---|
421 | pAioMgr->cRequestsActive--;
|
---|
422 | pEndpoint->AioMgr.cRequestsActive--;
|
---|
423 | }
|
---|
424 | }
|
---|
425 | LogFlow(("Removed requests. I/O manager has a total of %d active requests now\n", pAioMgr->cRequestsActive));
|
---|
426 | LogFlow(("Endpoint has a total of %d active requests now\n", pEndpoint->AioMgr.cRequestsActive));
|
---|
427 | }
|
---|
428 | else
|
---|
429 | AssertMsgFailed(("Unexpected return code rc=%Rrc\n", rc));
|
---|
430 | }
|
---|
431 |
|
---|
432 | return rc;
|
---|
433 | }
|
---|
434 |
|
---|
435 | /**
|
---|
436 | * Allocates a async I/O request.
|
---|
437 | *
|
---|
438 | * @returns Handle to the request.
|
---|
439 | * @param pAioMgr The I/O manager.
|
---|
440 | */
|
---|
441 | static RTFILEAIOREQ pdmacFileAioMgrNormalRequestAlloc(PPDMACEPFILEMGR pAioMgr)
|
---|
442 | {
|
---|
443 | RTFILEAIOREQ hReq = NIL_RTFILEAIOREQ;
|
---|
444 |
|
---|
445 | /* Get a request handle. */
|
---|
446 | if (pAioMgr->iFreeReqNext != pAioMgr->iFreeEntryNext)
|
---|
447 | {
|
---|
448 | hReq = pAioMgr->pahReqsFree[pAioMgr->iFreeReqNext];
|
---|
449 | pAioMgr->pahReqsFree[pAioMgr->iFreeReqNext] = NIL_RTFILEAIOREQ;
|
---|
450 | pAioMgr->iFreeReqNext = (pAioMgr->iFreeReqNext + 1) % pAioMgr->cReqEntries;
|
---|
451 | }
|
---|
452 | else
|
---|
453 | {
|
---|
454 | int rc = RTFileAioReqCreate(&hReq);
|
---|
455 | AssertRC(rc);
|
---|
456 | }
|
---|
457 |
|
---|
458 | return hReq;
|
---|
459 | }
|
---|
460 |
|
---|
461 | static bool pdmacFileAioMgrNormalIsRangeLocked(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
|
---|
462 | RTFOFF offStart, size_t cbRange,
|
---|
463 | PPDMACTASKFILE pTask)
|
---|
464 | {
|
---|
465 | PPDMACFILERANGELOCK pRangeLock = NULL; /** < Range lock */
|
---|
466 |
|
---|
467 | AssertMsg( pTask->enmTransferType == PDMACTASKFILETRANSFER_WRITE
|
---|
468 | || pTask->enmTransferType == PDMACTASKFILETRANSFER_READ,
|
---|
469 | ("Invalid task type %d\n", pTask->enmTransferType));
|
---|
470 |
|
---|
471 | pRangeLock = (PPDMACFILERANGELOCK)RTAvlrFileOffsetGet(pEndpoint->AioMgr.pTreeRangesLocked, offStart);
|
---|
472 | if (!pRangeLock)
|
---|
473 | {
|
---|
474 | pRangeLock = (PPDMACFILERANGELOCK)RTAvlrFileOffsetGetBestFit(pEndpoint->AioMgr.pTreeRangesLocked, offStart, true);
|
---|
475 | /* Check if we intersect with the range. */
|
---|
476 | if ( !pRangeLock
|
---|
477 | || !( (pRangeLock->Core.Key) <= (offStart + (RTFOFF)cbRange - 1)
|
---|
478 | && (pRangeLock->Core.KeyLast) >= offStart))
|
---|
479 | {
|
---|
480 | pRangeLock = NULL; /* False alarm */
|
---|
481 | }
|
---|
482 | }
|
---|
483 |
|
---|
484 | /* Check whether we have one of the situations explained below */
|
---|
485 | if ( pRangeLock
|
---|
486 | #if 0 /** @todo: later. For now we will just block all requests if they interfere */
|
---|
487 | && ( (pRangeLock->fReadLock && pTask->enmTransferType == PDMACTASKFILETRANSFER_WRITE)
|
---|
488 | || (!pRangeLock->fReadLock)
|
---|
489 | #endif
|
---|
490 | )
|
---|
491 | {
|
---|
492 | /* Add to the list. */
|
---|
493 | pTask->pNext = NULL;
|
---|
494 |
|
---|
495 | if (!pRangeLock->pWaitingTasksHead)
|
---|
496 | {
|
---|
497 | Assert(!pRangeLock->pWaitingTasksTail);
|
---|
498 | pRangeLock->pWaitingTasksHead = pTask;
|
---|
499 | pRangeLock->pWaitingTasksTail = pTask;
|
---|
500 | }
|
---|
501 | else
|
---|
502 | {
|
---|
503 | AssertPtr(pRangeLock->pWaitingTasksTail);
|
---|
504 | pRangeLock->pWaitingTasksTail->pNext = pTask;
|
---|
505 | pRangeLock->pWaitingTasksTail = pTask;
|
---|
506 | }
|
---|
507 | return true;
|
---|
508 | }
|
---|
509 |
|
---|
510 | return false;
|
---|
511 | }
|
---|
512 |
|
---|
513 | static int pdmacFileAioMgrNormalRangeLock(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
|
---|
514 | RTFOFF offStart, size_t cbRange,
|
---|
515 | PPDMACTASKFILE pTask)
|
---|
516 | {
|
---|
517 | AssertMsg(!pdmacFileAioMgrNormalIsRangeLocked(pEndpoint, offStart, cbRange, pTask),
|
---|
518 | ("Range is already locked offStart=%RTfoff cbRange=%u\n",
|
---|
519 | offStart, cbRange));
|
---|
520 |
|
---|
521 | PPDMACFILERANGELOCK pRangeLock = (PPDMACFILERANGELOCK)RTMemAllocZ(sizeof(PDMACFILERANGELOCK));
|
---|
522 | if (!pRangeLock)
|
---|
523 | return VERR_NO_MEMORY;
|
---|
524 |
|
---|
525 | /* Init the lock. */
|
---|
526 | pRangeLock->Core.Key = offStart;
|
---|
527 | pRangeLock->Core.KeyLast = offStart + cbRange - 1;
|
---|
528 | pRangeLock->cRefs = 1;
|
---|
529 | pRangeLock->fReadLock = pTask->enmTransferType == PDMACTASKFILETRANSFER_READ;
|
---|
530 |
|
---|
531 | bool fInserted = RTAvlrFileOffsetInsert(pEndpoint->AioMgr.pTreeRangesLocked, &pRangeLock->Core);
|
---|
532 | AssertMsg(fInserted, ("Range lock was not inserted!\n"));
|
---|
533 |
|
---|
534 | /* Let the task point to its lock. */
|
---|
535 | pTask->pRangeLock = pRangeLock;
|
---|
536 |
|
---|
537 | return VINF_SUCCESS;
|
---|
538 | }
|
---|
539 |
|
---|
540 | static int pdmacFileAioMgrNormalRangeLockFree(PPDMACEPFILEMGR pAioMgr,
|
---|
541 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
|
---|
542 | PPDMACFILERANGELOCK pRangeLock)
|
---|
543 | {
|
---|
544 | PPDMACTASKFILE pTasksWaitingHead;
|
---|
545 |
|
---|
546 | AssertPtr(pRangeLock);
|
---|
547 | Assert(pRangeLock->cRefs == 1);
|
---|
548 |
|
---|
549 | RTAvlrFileOffsetRemove(pEndpoint->AioMgr.pTreeRangesLocked, pRangeLock->Core.Key);
|
---|
550 | pTasksWaitingHead = pRangeLock->pWaitingTasksHead;
|
---|
551 | RTMemFree(pRangeLock);
|
---|
552 |
|
---|
553 | return pdmacFileAioMgrNormalProcessTaskList(pTasksWaitingHead, pAioMgr, pEndpoint);
|
---|
554 | }
|
---|
555 |
|
---|
556 | static int pdmacFileAioMgrNormalTaskPrepare(PPDMACEPFILEMGR pAioMgr,
|
---|
557 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
|
---|
558 | PPDMACTASKFILE pTask, PRTFILEAIOREQ phReq)
|
---|
559 | {
|
---|
560 | int rc = VINF_SUCCESS;
|
---|
561 | RTFILEAIOREQ hReq = NIL_RTFILEAIOREQ;
|
---|
562 | PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
|
---|
563 | void *pvBuf = pTask->DataSeg.pvSeg;
|
---|
564 |
|
---|
565 | /* Get a request handle. */
|
---|
566 | hReq = pdmacFileAioMgrNormalRequestAlloc(pAioMgr);
|
---|
567 | AssertMsg(hReq != NIL_RTFILEAIOREQ, ("Out of request handles\n"));
|
---|
568 |
|
---|
569 | /*
|
---|
570 | * Check if the alignment requirements are met.
|
---|
571 | * Offset, transfer size and buffer address
|
---|
572 | * need to be on a 512 boundary.
|
---|
573 | */
|
---|
574 | RTFOFF offStart = pTask->Off & ~(RTFOFF)(512-1);
|
---|
575 | size_t cbToTransfer = RT_ALIGN_Z(pTask->DataSeg.cbSeg + (pTask->Off - offStart), 512);
|
---|
576 | PDMACTASKFILETRANSFER enmTransferType = pTask->enmTransferType;
|
---|
577 |
|
---|
578 | AssertMsg( pTask->enmTransferType == PDMACTASKFILETRANSFER_WRITE
|
---|
579 | || (uint64_t)(offStart + cbToTransfer) <= pEndpoint->cbFile,
|
---|
580 | ("Read exceeds file size offStart=%RTfoff cbToTransfer=%d cbFile=%llu\n",
|
---|
581 | offStart, cbToTransfer, pEndpoint->cbFile));
|
---|
582 |
|
---|
583 | pTask->fPrefetch = false;
|
---|
584 |
|
---|
585 | /*
|
---|
586 | * Before we start to setup the request we have to check whether there is a task
|
---|
587 | * already active which range intersects with ours. We have to defer execution
|
---|
588 | * of this task in two cases:
|
---|
589 | * - The pending task is a write and the current is either read or write
|
---|
590 | * - The pending task is a read and the current task is a write task.
|
---|
591 | *
|
---|
592 | * To check whether a range is currently "locked" we use the AVL tree where every pending task
|
---|
593 | * is stored by its file offset range. The current task will be added to the active task
|
---|
594 | * and will be executed when the active one completes. (The method below
|
---|
595 | * which checks whether a range is already used will add the task)
|
---|
596 | *
|
---|
597 | * This is neccessary because of the requirementto align all requests to a 512 boundary
|
---|
598 | * which is enforced by the host OS (Linux and Windows atm). It is possible that
|
---|
599 | * we have to process unaligned tasks and need to align them using bounce buffers.
|
---|
600 | * While the data is feteched from the file another request might arrive writing to
|
---|
601 | * the same range. This will result in data corruption if both are executed concurrently.
|
---|
602 | */
|
---|
603 | bool fLocked = pdmacFileAioMgrNormalIsRangeLocked(pEndpoint, offStart, cbToTransfer, pTask);
|
---|
604 |
|
---|
605 | if (!fLocked)
|
---|
606 | {
|
---|
607 | if ( RT_UNLIKELY(cbToTransfer != pTask->DataSeg.cbSeg)
|
---|
608 | || RT_UNLIKELY(offStart != pTask->Off)
|
---|
609 | || ((pEpClassFile->uBitmaskAlignment & (RTR3UINTPTR)pvBuf) != (RTR3UINTPTR)pvBuf))
|
---|
610 | {
|
---|
611 | LogFlow(("Using bounce buffer for task %#p cbToTransfer=%zd cbSeg=%zd offStart=%RTfoff off=%RTfoff\n",
|
---|
612 | pTask, cbToTransfer, pTask->DataSeg.cbSeg, offStart, pTask->Off));
|
---|
613 |
|
---|
614 | /* Create bounce buffer. */
|
---|
615 | pTask->fBounceBuffer = true;
|
---|
616 |
|
---|
617 | AssertMsg(pTask->Off >= offStart, ("Overflow in calculation Off=%llu offStart=%llu\n",
|
---|
618 | pTask->Off, offStart));
|
---|
619 | pTask->uBounceBufOffset = pTask->Off - offStart;
|
---|
620 |
|
---|
621 | /** @todo: I think we need something like a RTMemAllocAligned method here.
|
---|
622 | * Current assumption is that the maximum alignment is 4096byte
|
---|
623 | * (GPT disk on Windows)
|
---|
624 | * so we can use RTMemPageAlloc here.
|
---|
625 | */
|
---|
626 | pTask->pvBounceBuffer = RTMemPageAlloc(cbToTransfer);
|
---|
627 | if (RT_LIKELY(pTask->pvBounceBuffer))
|
---|
628 | {
|
---|
629 | pvBuf = pTask->pvBounceBuffer;
|
---|
630 |
|
---|
631 | if (pTask->enmTransferType == PDMACTASKFILETRANSFER_WRITE)
|
---|
632 | {
|
---|
633 | if ( RT_UNLIKELY(cbToTransfer != pTask->DataSeg.cbSeg)
|
---|
634 | || RT_UNLIKELY(offStart != pTask->Off))
|
---|
635 | {
|
---|
636 | /* We have to fill the buffer first before we can update the data. */
|
---|
637 | LogFlow(("Prefetching data for task %#p\n", pTask));
|
---|
638 | pTask->fPrefetch = true;
|
---|
639 | enmTransferType = PDMACTASKFILETRANSFER_READ;
|
---|
640 | }
|
---|
641 | else
|
---|
642 | memcpy(pvBuf, pTask->DataSeg.pvSeg, pTask->DataSeg.cbSeg);
|
---|
643 | }
|
---|
644 | }
|
---|
645 | else
|
---|
646 | rc = VERR_NO_MEMORY;
|
---|
647 | }
|
---|
648 | else
|
---|
649 | pTask->fBounceBuffer = false;
|
---|
650 |
|
---|
651 | if (RT_SUCCESS(rc))
|
---|
652 | {
|
---|
653 | AssertMsg((pEpClassFile->uBitmaskAlignment & (RTR3UINTPTR)pvBuf) == (RTR3UINTPTR)pvBuf,
|
---|
654 | ("AIO: Alignment restrictions not met! pvBuf=%p uBitmaskAlignment=%p\n", pvBuf, pEpClassFile->uBitmaskAlignment));
|
---|
655 |
|
---|
656 | if (enmTransferType == PDMACTASKFILETRANSFER_WRITE)
|
---|
657 | {
|
---|
658 | /* Grow the file if needed. */
|
---|
659 | if (RT_UNLIKELY((uint64_t)(pTask->Off + pTask->DataSeg.cbSeg) > pEndpoint->cbFile))
|
---|
660 | {
|
---|
661 | ASMAtomicWriteU64(&pEndpoint->cbFile, pTask->Off + pTask->DataSeg.cbSeg);
|
---|
662 | RTFileSetSize(pEndpoint->File, pTask->Off + pTask->DataSeg.cbSeg);
|
---|
663 | }
|
---|
664 |
|
---|
665 | rc = RTFileAioReqPrepareWrite(hReq, pEndpoint->File,
|
---|
666 | offStart, pvBuf, cbToTransfer, pTask);
|
---|
667 | }
|
---|
668 | else
|
---|
669 | rc = RTFileAioReqPrepareRead(hReq, pEndpoint->File,
|
---|
670 | offStart, pvBuf, cbToTransfer, pTask);
|
---|
671 | AssertRC(rc);
|
---|
672 |
|
---|
673 | rc = pdmacFileAioMgrNormalRangeLock(pEndpoint, offStart, cbToTransfer, pTask);
|
---|
674 |
|
---|
675 | if (RT_SUCCESS(rc))
|
---|
676 | *phReq = hReq;
|
---|
677 | else
|
---|
678 | {
|
---|
679 | /* Cleanup */
|
---|
680 | if (pTask->fBounceBuffer)
|
---|
681 | RTMemPageFree(pTask->pvBounceBuffer);
|
---|
682 | }
|
---|
683 | }
|
---|
684 | }
|
---|
685 | else
|
---|
686 | {
|
---|
687 | LogFlow(("Task %#p was deferred because the access range is locked\n", pTask));
|
---|
688 | rc = VINF_SUCCESS;
|
---|
689 | }
|
---|
690 |
|
---|
691 | return rc;
|
---|
692 | }
|
---|
693 |
|
---|
694 | static int pdmacFileAioMgrNormalProcessTaskList(PPDMACTASKFILE pTaskHead,
|
---|
695 | PPDMACEPFILEMGR pAioMgr,
|
---|
696 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
|
---|
697 | {
|
---|
698 | RTFILEAIOREQ apReqs[20];
|
---|
699 | unsigned cRequests = 0;
|
---|
700 | unsigned cMaxRequests = PDMACEPFILEMGR_REQS_MAX - pAioMgr->cRequestsActive;
|
---|
701 | int rc = VINF_SUCCESS;
|
---|
702 |
|
---|
703 | AssertMsg(pEndpoint->enmState == PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE,
|
---|
704 | ("Trying to process request lists of a non active endpoint!\n"));
|
---|
705 |
|
---|
706 | /* Go through the list and queue the requests until we get a flush request */
|
---|
707 | while ( pTaskHead
|
---|
708 | && !pEndpoint->pFlushReq
|
---|
709 | && (cMaxRequests > 0)
|
---|
710 | && RT_SUCCESS(rc))
|
---|
711 | {
|
---|
712 | PPDMACTASKFILE pCurr = pTaskHead;
|
---|
713 |
|
---|
714 | if (!pdmacFileBwMgrIsTransferAllowed(pEndpoint->pBwMgr, (uint32_t)pCurr->DataSeg.cbSeg))
|
---|
715 | {
|
---|
716 | pAioMgr->fBwLimitReached = true;
|
---|
717 | break;
|
---|
718 | }
|
---|
719 |
|
---|
720 | pTaskHead = pTaskHead->pNext;
|
---|
721 |
|
---|
722 | pCurr->pNext = NULL;
|
---|
723 |
|
---|
724 | AssertMsg(VALID_PTR(pCurr->pEndpoint) && (pCurr->pEndpoint == pEndpoint),
|
---|
725 | ("Endpoints do not match\n"));
|
---|
726 |
|
---|
727 | switch (pCurr->enmTransferType)
|
---|
728 | {
|
---|
729 | case PDMACTASKFILETRANSFER_FLUSH:
|
---|
730 | {
|
---|
731 | /* If there is no data transfer request this flush request finished immediately. */
|
---|
732 | if (!pEndpoint->AioMgr.cRequestsActive)
|
---|
733 | {
|
---|
734 | pCurr->pfnCompleted(pCurr, pCurr->pvUser);
|
---|
735 | pdmacFileTaskFree(pEndpoint, pCurr);
|
---|
736 | }
|
---|
737 | else
|
---|
738 | {
|
---|
739 | Assert(!pEndpoint->pFlushReq);
|
---|
740 | pEndpoint->pFlushReq = pCurr;
|
---|
741 | }
|
---|
742 | break;
|
---|
743 | }
|
---|
744 | case PDMACTASKFILETRANSFER_READ:
|
---|
745 | case PDMACTASKFILETRANSFER_WRITE:
|
---|
746 | {
|
---|
747 | RTFILEAIOREQ hReq = NIL_RTFILEAIOREQ;
|
---|
748 |
|
---|
749 | rc = pdmacFileAioMgrNormalTaskPrepare(pAioMgr, pEndpoint, pCurr, &hReq);
|
---|
750 | AssertRC(rc);
|
---|
751 |
|
---|
752 | if (hReq != NIL_RTFILEAIOREQ)
|
---|
753 | {
|
---|
754 | apReqs[cRequests] = hReq;
|
---|
755 | pEndpoint->AioMgr.cReqsProcessed++;
|
---|
756 | cMaxRequests--;
|
---|
757 | cRequests++;
|
---|
758 | if (cRequests == RT_ELEMENTS(apReqs))
|
---|
759 | {
|
---|
760 | rc = pdmacFileAioMgrNormalReqsEnqueue(pAioMgr, pEndpoint, apReqs, cRequests);
|
---|
761 | cRequests = 0;
|
---|
762 | AssertMsg(RT_SUCCESS(rc) || (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
|
---|
763 | ("Unexpected return code\n"));
|
---|
764 | }
|
---|
765 | }
|
---|
766 | break;
|
---|
767 | }
|
---|
768 | default:
|
---|
769 | AssertMsgFailed(("Invalid transfer type %d\n", pCurr->enmTransferType));
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | if (cRequests)
|
---|
774 | {
|
---|
775 | rc = pdmacFileAioMgrNormalReqsEnqueue(pAioMgr, pEndpoint, apReqs, cRequests);
|
---|
776 | AssertMsg(RT_SUCCESS(rc) || (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
|
---|
777 | ("Unexpected return code rc=%Rrc\n", rc));
|
---|
778 | }
|
---|
779 |
|
---|
780 | if (pTaskHead)
|
---|
781 | {
|
---|
782 | /* Add the rest of the tasks to the pending list */
|
---|
783 | pdmacFileAioMgrEpAddTaskList(pEndpoint, pTaskHead);
|
---|
784 |
|
---|
785 | if (RT_UNLIKELY( !cMaxRequests
|
---|
786 | && !pEndpoint->pFlushReq
|
---|
787 | && !pAioMgr->fBwLimitReached))
|
---|
788 | {
|
---|
789 | /*
|
---|
790 | * The I/O manager has no room left for more requests
|
---|
791 | * but there are still requests to process.
|
---|
792 | * Create a new I/O manager and let it handle some endpoints.
|
---|
793 | */
|
---|
794 | pdmacFileAioMgrNormalBalanceLoad(pAioMgr);
|
---|
795 | }
|
---|
796 | }
|
---|
797 |
|
---|
798 | /* Insufficient resources are not fatal. */
|
---|
799 | if (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES)
|
---|
800 | rc = VINF_SUCCESS;
|
---|
801 |
|
---|
802 | return rc;
|
---|
803 | }
|
---|
804 |
|
---|
805 | /**
|
---|
806 | * Adds all pending requests for the given endpoint
|
---|
807 | * until a flush request is encountered or there is no
|
---|
808 | * request anymore.
|
---|
809 | *
|
---|
810 | * @returns VBox status code.
|
---|
811 | * @param pAioMgr The async I/O manager for the endpoint
|
---|
812 | * @param pEndpoint The endpoint to get the requests from.
|
---|
813 | */
|
---|
814 | static int pdmacFileAioMgrNormalQueueReqs(PPDMACEPFILEMGR pAioMgr,
|
---|
815 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
|
---|
816 | {
|
---|
817 | int rc = VINF_SUCCESS;
|
---|
818 | PPDMACTASKFILE pTasksHead = NULL;
|
---|
819 |
|
---|
820 | AssertMsg(pEndpoint->enmState == PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE,
|
---|
821 | ("Trying to process request lists of a non active endpoint!\n"));
|
---|
822 |
|
---|
823 | Assert(!pEndpoint->pFlushReq);
|
---|
824 |
|
---|
825 | /* Check the pending list first */
|
---|
826 | if (pEndpoint->AioMgr.pReqsPendingHead)
|
---|
827 | {
|
---|
828 | LogFlow(("Queuing pending requests first\n"));
|
---|
829 |
|
---|
830 | pTasksHead = pEndpoint->AioMgr.pReqsPendingHead;
|
---|
831 | /*
|
---|
832 | * Clear the list as the processing routine will insert them into the list
|
---|
833 | * again if it gets a flush request.
|
---|
834 | */
|
---|
835 | pEndpoint->AioMgr.pReqsPendingHead = NULL;
|
---|
836 | pEndpoint->AioMgr.pReqsPendingTail = NULL;
|
---|
837 | rc = pdmacFileAioMgrNormalProcessTaskList(pTasksHead, pAioMgr, pEndpoint);
|
---|
838 | AssertRC(rc);
|
---|
839 | }
|
---|
840 |
|
---|
841 | if (!pEndpoint->pFlushReq && !pEndpoint->AioMgr.pReqsPendingHead)
|
---|
842 | {
|
---|
843 | /* Now the request queue. */
|
---|
844 | pTasksHead = pdmacFileEpGetNewTasks(pEndpoint);
|
---|
845 | if (pTasksHead)
|
---|
846 | {
|
---|
847 | rc = pdmacFileAioMgrNormalProcessTaskList(pTasksHead, pAioMgr, pEndpoint);
|
---|
848 | AssertRC(rc);
|
---|
849 | }
|
---|
850 | }
|
---|
851 |
|
---|
852 | return rc;
|
---|
853 | }
|
---|
854 |
|
---|
855 | static int pdmacFileAioMgrNormalProcessBlockingEvent(PPDMACEPFILEMGR pAioMgr)
|
---|
856 | {
|
---|
857 | int rc = VINF_SUCCESS;
|
---|
858 | bool fNotifyWaiter = false;
|
---|
859 |
|
---|
860 | LogFlowFunc((": Enter\n"));
|
---|
861 |
|
---|
862 | Assert(pAioMgr->fBlockingEventPending);
|
---|
863 |
|
---|
864 | switch (pAioMgr->enmBlockingEvent)
|
---|
865 | {
|
---|
866 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT:
|
---|
867 | {
|
---|
868 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointNew = (PPDMASYNCCOMPLETIONENDPOINTFILE)ASMAtomicReadPtr((void * volatile *)&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint);
|
---|
869 | AssertMsg(VALID_PTR(pEndpointNew), ("Adding endpoint event without a endpoint to add\n"));
|
---|
870 |
|
---|
871 | pEndpointNew->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE;
|
---|
872 |
|
---|
873 | pEndpointNew->AioMgr.pEndpointNext = pAioMgr->pEndpointsHead;
|
---|
874 | pEndpointNew->AioMgr.pEndpointPrev = NULL;
|
---|
875 | if (pAioMgr->pEndpointsHead)
|
---|
876 | pAioMgr->pEndpointsHead->AioMgr.pEndpointPrev = pEndpointNew;
|
---|
877 | pAioMgr->pEndpointsHead = pEndpointNew;
|
---|
878 |
|
---|
879 | /* Assign the completion point to this file. */
|
---|
880 | rc = RTFileAioCtxAssociateWithFile(pAioMgr->hAioCtx, pEndpointNew->File);
|
---|
881 | fNotifyWaiter = true;
|
---|
882 | pAioMgr->cEndpoints++;
|
---|
883 | break;
|
---|
884 | }
|
---|
885 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT:
|
---|
886 | {
|
---|
887 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointRemove = (PPDMASYNCCOMPLETIONENDPOINTFILE)ASMAtomicReadPtr((void * volatile *)&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint);
|
---|
888 | AssertMsg(VALID_PTR(pEndpointRemove), ("Removing endpoint event without a endpoint to remove\n"));
|
---|
889 |
|
---|
890 | pEndpointRemove->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_REMOVING;
|
---|
891 | fNotifyWaiter = !pdmacFileAioMgrNormalRemoveEndpoint(pEndpointRemove);
|
---|
892 | break;
|
---|
893 | }
|
---|
894 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT:
|
---|
895 | {
|
---|
896 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointClose = (PPDMASYNCCOMPLETIONENDPOINTFILE)ASMAtomicReadPtr((void * volatile *)&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint);
|
---|
897 | AssertMsg(VALID_PTR(pEndpointClose), ("Close endpoint event without a endpoint to close\n"));
|
---|
898 |
|
---|
899 | if (pEndpointClose->enmState == PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE)
|
---|
900 | {
|
---|
901 | LogFlowFunc((": Closing endpoint %#p{%s}\n", pEndpointClose, pEndpointClose->Core.pszUri));
|
---|
902 |
|
---|
903 | /* Make sure all tasks finished. Process the queues a last time first. */
|
---|
904 | rc = pdmacFileAioMgrNormalQueueReqs(pAioMgr, pEndpointClose);
|
---|
905 | AssertRC(rc);
|
---|
906 |
|
---|
907 | pEndpointClose->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_CLOSING;
|
---|
908 | fNotifyWaiter = !pdmacFileAioMgrNormalRemoveEndpoint(pEndpointClose);
|
---|
909 | }
|
---|
910 | else if ( (pEndpointClose->enmState == PDMASYNCCOMPLETIONENDPOINTFILESTATE_CLOSING)
|
---|
911 | && (!pEndpointClose->AioMgr.cRequestsActive))
|
---|
912 | fNotifyWaiter = true;
|
---|
913 | break;
|
---|
914 | }
|
---|
915 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN:
|
---|
916 | {
|
---|
917 | pAioMgr->enmState = PDMACEPFILEMGRSTATE_SHUTDOWN;
|
---|
918 | if (!pAioMgr->cRequestsActive)
|
---|
919 | fNotifyWaiter = true;
|
---|
920 | break;
|
---|
921 | }
|
---|
922 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_SUSPEND:
|
---|
923 | {
|
---|
924 | pAioMgr->enmState = PDMACEPFILEMGRSTATE_SUSPENDING;
|
---|
925 | break;
|
---|
926 | }
|
---|
927 | case PDMACEPFILEAIOMGRBLOCKINGEVENT_RESUME:
|
---|
928 | {
|
---|
929 | pAioMgr->enmState = PDMACEPFILEMGRSTATE_RUNNING;
|
---|
930 | fNotifyWaiter = true;
|
---|
931 | break;
|
---|
932 | }
|
---|
933 | default:
|
---|
934 | AssertReleaseMsgFailed(("Invalid event type %d\n", pAioMgr->enmBlockingEvent));
|
---|
935 | }
|
---|
936 |
|
---|
937 | if (fNotifyWaiter)
|
---|
938 | {
|
---|
939 | ASMAtomicWriteBool(&pAioMgr->fBlockingEventPending, false);
|
---|
940 | pAioMgr->enmBlockingEvent = PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID;
|
---|
941 |
|
---|
942 | /* Release the waiting thread. */
|
---|
943 | LogFlow(("Signalling waiter\n"));
|
---|
944 | rc = RTSemEventSignal(pAioMgr->EventSemBlock);
|
---|
945 | AssertRC(rc);
|
---|
946 | }
|
---|
947 |
|
---|
948 | LogFlowFunc((": Leave\n"));
|
---|
949 | return rc;
|
---|
950 | }
|
---|
951 |
|
---|
952 | /**
|
---|
953 | * Checks all endpoints for pending events or new requests.
|
---|
954 | *
|
---|
955 | * @returns VBox status code.
|
---|
956 | * @param pAioMgr The I/O manager handle.
|
---|
957 | */
|
---|
958 | static int pdmacFileAioMgrNormalCheckEndpoints(PPDMACEPFILEMGR pAioMgr)
|
---|
959 | {
|
---|
960 | /* Check the assigned endpoints for new tasks if there isn't a flush request active at the moment. */
|
---|
961 | int rc = VINF_SUCCESS;
|
---|
962 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint = pAioMgr->pEndpointsHead;
|
---|
963 |
|
---|
964 | pAioMgr->fBwLimitReached = false;
|
---|
965 |
|
---|
966 | while (pEndpoint)
|
---|
967 | {
|
---|
968 | if (!pEndpoint->pFlushReq
|
---|
969 | && (pEndpoint->enmState == PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE)
|
---|
970 | && !pEndpoint->AioMgr.fMoving)
|
---|
971 | {
|
---|
972 | rc = pdmacFileAioMgrNormalQueueReqs(pAioMgr, pEndpoint);
|
---|
973 | if (RT_FAILURE(rc))
|
---|
974 | return rc;
|
---|
975 | }
|
---|
976 | else if (!pEndpoint->AioMgr.cRequestsActive)
|
---|
977 | {
|
---|
978 | /* Reopen the file so that the new endpoint can reassociate with the file */
|
---|
979 | RTFileClose(pEndpoint->File);
|
---|
980 | rc = RTFileOpen(&pEndpoint->File, pEndpoint->Core.pszUri, pEndpoint->fFlags);
|
---|
981 | AssertRC(rc);
|
---|
982 |
|
---|
983 | if (pEndpoint->AioMgr.fMoving)
|
---|
984 | {
|
---|
985 | pEndpoint->AioMgr.fMoving = false;
|
---|
986 | pdmacFileAioMgrAddEndpoint(pEndpoint->AioMgr.pAioMgrDst, pEndpoint);
|
---|
987 | }
|
---|
988 | else
|
---|
989 | {
|
---|
990 | Assert(pAioMgr->fBlockingEventPending);
|
---|
991 | ASMAtomicWriteBool(&pAioMgr->fBlockingEventPending, false);
|
---|
992 |
|
---|
993 | /* Release the waiting thread. */
|
---|
994 | LogFlow(("Signalling waiter\n"));
|
---|
995 | rc = RTSemEventSignal(pAioMgr->EventSemBlock);
|
---|
996 | AssertRC(rc);
|
---|
997 | }
|
---|
998 | }
|
---|
999 |
|
---|
1000 | pEndpoint = pEndpoint->AioMgr.pEndpointNext;
|
---|
1001 | }
|
---|
1002 |
|
---|
1003 | return rc;
|
---|
1004 | }
|
---|
1005 |
|
---|
1006 | static void pdmacFileAioMgrNormalReqComplete(PPDMACEPFILEMGR pAioMgr, RTFILEAIOREQ hReq)
|
---|
1007 | {
|
---|
1008 | int rc = VINF_SUCCESS;
|
---|
1009 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
|
---|
1010 | size_t cbTransfered = 0;
|
---|
1011 | int rcReq = RTFileAioReqGetRC(hReq, &cbTransfered);
|
---|
1012 | PPDMACTASKFILE pTask = (PPDMACTASKFILE)RTFileAioReqGetUser(hReq);
|
---|
1013 |
|
---|
1014 | pEndpoint = pTask->pEndpoint;
|
---|
1015 |
|
---|
1016 | /*
|
---|
1017 | * It is possible that the request failed on Linux with kernels < 2.6.23
|
---|
1018 | * if the passed buffer was allocated with remap_pfn_range or if the file
|
---|
1019 | * is on an NFS endpoint which does not support async and direct I/O at the same time.
|
---|
1020 | * The endpoint will be migrated to a failsafe manager in case a request fails.
|
---|
1021 | */
|
---|
1022 | if (RT_FAILURE(rcReq))
|
---|
1023 | {
|
---|
1024 | /* Free bounce buffers and the IPRT request. */
|
---|
1025 | pAioMgr->pahReqsFree[pAioMgr->iFreeEntryNext] = hReq;
|
---|
1026 | pAioMgr->iFreeEntryNext = (pAioMgr->iFreeEntryNext + 1) % pAioMgr->cReqEntries;
|
---|
1027 |
|
---|
1028 | /* Free the lock and process pending tasks if neccessary */
|
---|
1029 | pdmacFileAioMgrNormalRangeLockFree(pAioMgr, pEndpoint, pTask->pRangeLock);
|
---|
1030 |
|
---|
1031 | pAioMgr->cRequestsActive--;
|
---|
1032 | pEndpoint->AioMgr.cRequestsActive--;
|
---|
1033 | pEndpoint->AioMgr.cReqsProcessed++;
|
---|
1034 |
|
---|
1035 | if (pTask->fBounceBuffer)
|
---|
1036 | RTMemFree(pTask->pvBounceBuffer);
|
---|
1037 |
|
---|
1038 | /* Queue the request on the pending list. */
|
---|
1039 | pTask->pNext = pEndpoint->AioMgr.pReqsPendingHead;
|
---|
1040 | pEndpoint->AioMgr.pReqsPendingHead = pTask;
|
---|
1041 |
|
---|
1042 | /* Create a new failsafe manager if neccessary. */
|
---|
1043 | if (!pEndpoint->AioMgr.fMoving)
|
---|
1044 | {
|
---|
1045 | PPDMACEPFILEMGR pAioMgrFailsafe;
|
---|
1046 |
|
---|
1047 | LogRel(("%s: Request %#p failed with rc=%Rrc, migrating endpoint %s to failsafe manager.\n",
|
---|
1048 | RTThreadGetName(pAioMgr->Thread), pTask, rcReq, pEndpoint->Core.pszUri));
|
---|
1049 |
|
---|
1050 | pEndpoint->AioMgr.fMoving = true;
|
---|
1051 |
|
---|
1052 | rc = pdmacFileAioMgrCreate((PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass,
|
---|
1053 | &pAioMgrFailsafe, true);
|
---|
1054 | AssertRC(rc);
|
---|
1055 |
|
---|
1056 | pEndpoint->AioMgr.pAioMgrDst = pAioMgrFailsafe;
|
---|
1057 |
|
---|
1058 | /* Update the flags to open the file with. Disable async I/O and enable the host cache. */
|
---|
1059 | pEndpoint->fFlags &= ~(RTFILE_O_ASYNC_IO | RTFILE_O_NO_CACHE);
|
---|
1060 | }
|
---|
1061 |
|
---|
1062 | /* If this was the last request for the endpoint migrate it to the new manager. */
|
---|
1063 | if (!pEndpoint->AioMgr.cRequestsActive)
|
---|
1064 | {
|
---|
1065 | bool fReqsPending = pdmacFileAioMgrNormalRemoveEndpoint(pEndpoint);
|
---|
1066 | Assert(!fReqsPending);
|
---|
1067 |
|
---|
1068 | rc = pdmacFileAioMgrAddEndpoint(pEndpoint->AioMgr.pAioMgrDst, pEndpoint);
|
---|
1069 | AssertRC(rc);
|
---|
1070 | }
|
---|
1071 | }
|
---|
1072 | else
|
---|
1073 | {
|
---|
1074 | AssertMsg(( (cbTransfered == pTask->DataSeg.cbSeg)
|
---|
1075 | || (pTask->fBounceBuffer && (cbTransfered >= pTask->DataSeg.cbSeg))),
|
---|
1076 | ("Task didn't completed successfully (rc=%Rrc) or was incomplete (cbTransfered=%u)\n", rcReq, cbTransfered));
|
---|
1077 |
|
---|
1078 | if (pTask->fPrefetch)
|
---|
1079 | {
|
---|
1080 | Assert(pTask->enmTransferType == PDMACTASKFILETRANSFER_WRITE);
|
---|
1081 | Assert(pTask->fBounceBuffer);
|
---|
1082 |
|
---|
1083 | memcpy(((uint8_t *)pTask->pvBounceBuffer) + pTask->uBounceBufOffset,
|
---|
1084 | pTask->DataSeg.pvSeg,
|
---|
1085 | pTask->DataSeg.cbSeg);
|
---|
1086 |
|
---|
1087 | /* Write it now. */
|
---|
1088 | pTask->fPrefetch = false;
|
---|
1089 | size_t cbToTransfer = RT_ALIGN_Z(pTask->DataSeg.cbSeg, 512);
|
---|
1090 | RTFOFF offStart = pTask->Off & ~(RTFOFF)(512-1);
|
---|
1091 |
|
---|
1092 | /* Grow the file if needed. */
|
---|
1093 | if (RT_UNLIKELY((uint64_t)(pTask->Off + pTask->DataSeg.cbSeg) > pEndpoint->cbFile))
|
---|
1094 | {
|
---|
1095 | ASMAtomicWriteU64(&pEndpoint->cbFile, pTask->Off + pTask->DataSeg.cbSeg);
|
---|
1096 | RTFileSetSize(pEndpoint->File, pTask->Off + pTask->DataSeg.cbSeg);
|
---|
1097 | }
|
---|
1098 |
|
---|
1099 | rc = RTFileAioReqPrepareWrite(hReq, pEndpoint->File,
|
---|
1100 | offStart, pTask->pvBounceBuffer, cbToTransfer, pTask);
|
---|
1101 | AssertRC(rc);
|
---|
1102 | rc = RTFileAioCtxSubmit(pAioMgr->hAioCtx, &hReq, 1);
|
---|
1103 | AssertRC(rc);
|
---|
1104 | }
|
---|
1105 | else
|
---|
1106 | {
|
---|
1107 | if (pTask->fBounceBuffer)
|
---|
1108 | {
|
---|
1109 | if (pTask->enmTransferType == PDMACTASKFILETRANSFER_READ)
|
---|
1110 | memcpy(pTask->DataSeg.pvSeg,
|
---|
1111 | ((uint8_t *)pTask->pvBounceBuffer) + pTask->uBounceBufOffset,
|
---|
1112 | pTask->DataSeg.cbSeg);
|
---|
1113 |
|
---|
1114 | RTMemPageFree(pTask->pvBounceBuffer);
|
---|
1115 | }
|
---|
1116 |
|
---|
1117 | /* Put the entry on the free array */
|
---|
1118 | pAioMgr->pahReqsFree[pAioMgr->iFreeEntryNext] = hReq;
|
---|
1119 | pAioMgr->iFreeEntryNext = (pAioMgr->iFreeEntryNext + 1) % pAioMgr->cReqEntries;
|
---|
1120 |
|
---|
1121 | pAioMgr->cRequestsActive--;
|
---|
1122 | pEndpoint->AioMgr.cRequestsActive--;
|
---|
1123 | pEndpoint->AioMgr.cReqsProcessed++;
|
---|
1124 |
|
---|
1125 | /* Free the lock and process pending tasks if neccessary */
|
---|
1126 | pdmacFileAioMgrNormalRangeLockFree(pAioMgr, pEndpoint, pTask->pRangeLock);
|
---|
1127 |
|
---|
1128 | /* Call completion callback */
|
---|
1129 | pTask->pfnCompleted(pTask, pTask->pvUser);
|
---|
1130 | pdmacFileTaskFree(pEndpoint, pTask);
|
---|
1131 |
|
---|
1132 | /*
|
---|
1133 | * If there is no request left on the endpoint but a flush request is set
|
---|
1134 | * it completed now and we notify the owner.
|
---|
1135 | * Furthermore we look for new requests and continue.
|
---|
1136 | */
|
---|
1137 | if (!pEndpoint->AioMgr.cRequestsActive && pEndpoint->pFlushReq)
|
---|
1138 | {
|
---|
1139 | /* Call completion callback */
|
---|
1140 | pTask = pEndpoint->pFlushReq;
|
---|
1141 | pEndpoint->pFlushReq = NULL;
|
---|
1142 |
|
---|
1143 | AssertMsg(pTask->pEndpoint == pEndpoint, ("Endpoint of the flush request does not match assigned one\n"));
|
---|
1144 |
|
---|
1145 | pTask->pfnCompleted(pTask, pTask->pvUser);
|
---|
1146 | pdmacFileTaskFree(pEndpoint, pTask);
|
---|
1147 | }
|
---|
1148 | else if (RT_UNLIKELY(!pEndpoint->AioMgr.cRequestsActive && pEndpoint->AioMgr.fMoving))
|
---|
1149 | {
|
---|
1150 | /* If the endpoint is about to be migrated do it now. */
|
---|
1151 | bool fReqsPending = pdmacFileAioMgrNormalRemoveEndpoint(pEndpoint);
|
---|
1152 | Assert(!fReqsPending);
|
---|
1153 |
|
---|
1154 | rc = pdmacFileAioMgrAddEndpoint(pEndpoint->AioMgr.pAioMgrDst, pEndpoint);
|
---|
1155 | AssertRC(rc);
|
---|
1156 | }
|
---|
1157 | }
|
---|
1158 | } /* request completed successfully */
|
---|
1159 | }
|
---|
1160 |
|
---|
1161 | /** Helper macro for checking for error codes. */
|
---|
1162 | #define CHECK_RC(pAioMgr, rc) \
|
---|
1163 | if (RT_FAILURE(rc)) \
|
---|
1164 | {\
|
---|
1165 | int rc2 = pdmacFileAioMgrNormalErrorHandler(pAioMgr, rc, RT_SRC_POS);\
|
---|
1166 | return rc2;\
|
---|
1167 | }
|
---|
1168 |
|
---|
1169 | /**
|
---|
1170 | * The normal I/O manager using the RTFileAio* API
|
---|
1171 | *
|
---|
1172 | * @returns VBox status code.
|
---|
1173 | * @param ThreadSelf Handle of the thread.
|
---|
1174 | * @param pvUser Opaque user data.
|
---|
1175 | */
|
---|
1176 | int pdmacFileAioMgrNormal(RTTHREAD ThreadSelf, void *pvUser)
|
---|
1177 | {
|
---|
1178 | int rc = VINF_SUCCESS;
|
---|
1179 | PPDMACEPFILEMGR pAioMgr = (PPDMACEPFILEMGR)pvUser;
|
---|
1180 | uint64_t uMillisEnd = RTTimeMilliTS() + PDMACEPFILEMGR_LOAD_UPDATE_PERIOD;
|
---|
1181 |
|
---|
1182 | while ( (pAioMgr->enmState == PDMACEPFILEMGRSTATE_RUNNING)
|
---|
1183 | || (pAioMgr->enmState == PDMACEPFILEMGRSTATE_SUSPENDING))
|
---|
1184 | {
|
---|
1185 | ASMAtomicWriteBool(&pAioMgr->fWaitingEventSem, true);
|
---|
1186 | if (!ASMAtomicReadBool(&pAioMgr->fWokenUp))
|
---|
1187 | rc = RTSemEventWait(pAioMgr->EventSem, RT_INDEFINITE_WAIT);
|
---|
1188 | ASMAtomicWriteBool(&pAioMgr->fWaitingEventSem, false);
|
---|
1189 | AssertRC(rc);
|
---|
1190 |
|
---|
1191 | LogFlow(("Got woken up\n"));
|
---|
1192 | ASMAtomicWriteBool(&pAioMgr->fWokenUp, false);
|
---|
1193 |
|
---|
1194 | /* Check for an external blocking event first. */
|
---|
1195 | if (pAioMgr->fBlockingEventPending)
|
---|
1196 | {
|
---|
1197 | rc = pdmacFileAioMgrNormalProcessBlockingEvent(pAioMgr);
|
---|
1198 | CHECK_RC(pAioMgr, rc);
|
---|
1199 | }
|
---|
1200 |
|
---|
1201 | if (RT_LIKELY(pAioMgr->enmState == PDMACEPFILEMGRSTATE_RUNNING))
|
---|
1202 | {
|
---|
1203 | /* We got woken up because an endpoint issued new requests. Queue them. */
|
---|
1204 | rc = pdmacFileAioMgrNormalCheckEndpoints(pAioMgr);
|
---|
1205 | CHECK_RC(pAioMgr, rc);
|
---|
1206 |
|
---|
1207 | while ( pAioMgr->cRequestsActive
|
---|
1208 | || pAioMgr->fBwLimitReached)
|
---|
1209 | {
|
---|
1210 | if (pAioMgr->cRequestsActive)
|
---|
1211 | {
|
---|
1212 | RTFILEAIOREQ apReqs[20];
|
---|
1213 | uint32_t cReqsCompleted = 0;
|
---|
1214 | size_t cReqsWait;
|
---|
1215 |
|
---|
1216 | if (pAioMgr->cRequestsActive > RT_ELEMENTS(apReqs))
|
---|
1217 | cReqsWait = RT_ELEMENTS(apReqs);
|
---|
1218 | else
|
---|
1219 | cReqsWait = pAioMgr->cRequestsActive;
|
---|
1220 |
|
---|
1221 | LogFlow(("Waiting for %d of %d tasks to complete\n", pAioMgr->cRequestsActive, cReqsWait));
|
---|
1222 |
|
---|
1223 | rc = RTFileAioCtxWait(pAioMgr->hAioCtx,
|
---|
1224 | cReqsWait,
|
---|
1225 | RT_INDEFINITE_WAIT, apReqs,
|
---|
1226 | RT_ELEMENTS(apReqs), &cReqsCompleted);
|
---|
1227 | if (RT_FAILURE(rc) && (rc != VERR_INTERRUPTED))
|
---|
1228 | CHECK_RC(pAioMgr, rc);
|
---|
1229 |
|
---|
1230 | LogFlow(("%d tasks completed\n", cReqsCompleted));
|
---|
1231 |
|
---|
1232 | for (uint32_t i = 0; i < cReqsCompleted; i++)
|
---|
1233 | pdmacFileAioMgrNormalReqComplete(pAioMgr, apReqs[i]);
|
---|
1234 |
|
---|
1235 | /* Check for an external blocking event before we go to sleep again. */
|
---|
1236 | if (pAioMgr->fBlockingEventPending)
|
---|
1237 | {
|
---|
1238 | rc = pdmacFileAioMgrNormalProcessBlockingEvent(pAioMgr);
|
---|
1239 | CHECK_RC(pAioMgr, rc);
|
---|
1240 | }
|
---|
1241 |
|
---|
1242 | /* Update load statistics. */
|
---|
1243 | uint64_t uMillisCurr = RTTimeMilliTS();
|
---|
1244 | if (uMillisCurr > uMillisEnd)
|
---|
1245 | {
|
---|
1246 | PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointCurr = pAioMgr->pEndpointsHead;
|
---|
1247 |
|
---|
1248 | /* Calculate timespan. */
|
---|
1249 | uMillisCurr -= uMillisEnd;
|
---|
1250 |
|
---|
1251 | while (pEndpointCurr)
|
---|
1252 | {
|
---|
1253 | pEndpointCurr->AioMgr.cReqsPerSec = pEndpointCurr->AioMgr.cReqsProcessed / (uMillisCurr + PDMACEPFILEMGR_LOAD_UPDATE_PERIOD);
|
---|
1254 | pEndpointCurr->AioMgr.cReqsProcessed = 0;
|
---|
1255 | pEndpointCurr = pEndpointCurr->AioMgr.pEndpointNext;
|
---|
1256 | }
|
---|
1257 |
|
---|
1258 | /* Set new update interval */
|
---|
1259 | uMillisEnd = RTTimeMilliTS() + PDMACEPFILEMGR_LOAD_UPDATE_PERIOD;
|
---|
1260 | }
|
---|
1261 | }
|
---|
1262 | else
|
---|
1263 | {
|
---|
1264 | /*
|
---|
1265 | * Bandwidth limit reached for all endpoints.
|
---|
1266 | * Yield and wait until we have enough resources again.
|
---|
1267 | */
|
---|
1268 | RTThreadYield();
|
---|
1269 | }
|
---|
1270 |
|
---|
1271 | /* Check endpoints for new requests. */
|
---|
1272 | rc = pdmacFileAioMgrNormalCheckEndpoints(pAioMgr);
|
---|
1273 | CHECK_RC(pAioMgr, rc);
|
---|
1274 | } /* while requests are active. */
|
---|
1275 | } /* if still running */
|
---|
1276 | } /* while running */
|
---|
1277 |
|
---|
1278 | return rc;
|
---|
1279 | }
|
---|
1280 |
|
---|
1281 | #undef CHECK_RC
|
---|
1282 |
|
---|