diff options
Diffstat (limited to 'src/VBox/VMM/VMMR3/PDMAsyncCompletionFile.cpp')
| -rw-r--r-- | src/VBox/VMM/VMMR3/PDMAsyncCompletionFile.cpp | 1293 |
1 files changed, 1293 insertions, 0 deletions
diff --git a/src/VBox/VMM/VMMR3/PDMAsyncCompletionFile.cpp b/src/VBox/VMM/VMMR3/PDMAsyncCompletionFile.cpp new file mode 100644 index 00000000..616d98ba --- /dev/null +++ b/src/VBox/VMM/VMMR3/PDMAsyncCompletionFile.cpp @@ -0,0 +1,1293 @@ +/* $Id: PDMAsyncCompletionFile.cpp $ */ +/** @file + * PDM Async I/O - Transport data asynchronous in R3 using EMT. + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP LOG_GROUP_PDM_ASYNC_COMPLETION +#include "PDMInternal.h" +#include <VBox/vmm/pdm.h> +#include <VBox/vmm/mm.h> +#include <VBox/vmm/vm.h> +#include <VBox/err.h> +#include <VBox/log.h> +#include <VBox/dbg.h> +#include <VBox/vmm/uvm.h> +#include <VBox/vmm/tm.h> + +#include <iprt/asm.h> +#include <iprt/assert.h> +#include <iprt/critsect.h> +#include <iprt/env.h> +#include <iprt/file.h> +#include <iprt/mem.h> +#include <iprt/semaphore.h> +#include <iprt/string.h> +#include <iprt/thread.h> +#include <iprt/path.h> +#include <iprt/rand.h> + +#include "PDMAsyncCompletionFileInternal.h" + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +#ifdef VBOX_WITH_DEBUGGER +static FNDBGCCMD pdmacEpFileErrorInject; +# ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY +static FNDBGCCMD pdmacEpFileDelayInject; +# endif +#endif + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +#ifdef VBOX_WITH_DEBUGGER +static const DBGCVARDESC g_aInjectErrorArgs[] = +{ + /* cTimesMin, cTimesMax, enmCategory, fFlags, pszName, pszDescription */ + { 1, 1, DBGCVAR_CAT_STRING, 0, "direction", "write/read." }, + { 1, 1, DBGCVAR_CAT_STRING, 0, "filename", "Filename." }, + { 1, 1, DBGCVAR_CAT_NUMBER, 0, "errcode", "VBox status code." }, +}; + +# ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY +static const DBGCVARDESC g_aInjectDelayArgs[] = +{ + /* cTimesMin, cTimesMax, enmCategory, fFlags, pszName, pszDescription */ + { 1, 1, DBGCVAR_CAT_STRING, 0, "direction", "write|read|flush|any." }, + { 1, 1, DBGCVAR_CAT_STRING, 0, "filename", "Filename." }, + { 1, 1, DBGCVAR_CAT_NUMBER, 0, "delay", "Delay in milliseconds." }, + { 1, 1, DBGCVAR_CAT_NUMBER, 0, "jitter", "Jitter of the delay." }, + { 1, 1, DBGCVAR_CAT_NUMBER, 0, "reqs", "Number of requests to delay." } + +}; +# endif + +/** Command descriptors. */ +static const DBGCCMD g_aCmds[] = +{ + /* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, fFlags, pfnHandler pszSyntax,.pszDescription */ + { "injecterror", 3, 3, &g_aInjectErrorArgs[0], 3, 0, pdmacEpFileErrorInject, "", "Inject error into I/O subsystem." } +# ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY + ,{ "injectdelay", 3, 5, &g_aInjectDelayArgs[0], RT_ELEMENTS(g_aInjectDelayArgs), 0, pdmacEpFileDelayInject, "", "Inject a delay of a request." } +# endif +}; +#endif + + +/** + * Frees a task. + * + * @returns nothing. + * @param pEndpoint Pointer to the endpoint the segment was for. + * @param pTask The task to free. + */ +void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask) +{ + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass; + + LogFlowFunc((": pEndpoint=%p pTask=%p\n", pEndpoint, pTask)); + + /* Try the per endpoint cache first. */ + if (pEndpoint->cTasksCached < pEpClass->cTasksCacheMax) + { + /* Add it to the list. */ + pEndpoint->pTasksFreeTail->pNext = pTask; + pEndpoint->pTasksFreeTail = pTask; + ASMAtomicIncU32(&pEndpoint->cTasksCached); + } + else + { + Log(("Freeing task %p because all caches are full\n", pTask)); + MMR3HeapFree(pTask); + } +} + +/** + * Allocates a task segment + * + * @returns Pointer to the new task segment or NULL + * @param pEndpoint Pointer to the endpoint + */ +PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint) +{ + PPDMACTASKFILE pTask = NULL; + + /* Try the small per endpoint cache first. */ + if (pEndpoint->pTasksFreeHead == pEndpoint->pTasksFreeTail) + { + /* Try the bigger endpoint class cache. */ + PPDMASYNCCOMPLETIONEPCLASSFILE pEndpointClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass; + + /* + * Allocate completely new. + * If this fails we return NULL. + */ + int rc = MMR3HeapAllocZEx(pEndpointClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, + sizeof(PDMACTASKFILE), + (void **)&pTask); + if (RT_FAILURE(rc)) + pTask = NULL; + + LogFlow(("Allocated task %p\n", pTask)); + } + else + { + /* Grab a free task from the head. */ + AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contains more than one element\n")); + + pTask = pEndpoint->pTasksFreeHead; + pEndpoint->pTasksFreeHead = pTask->pNext; + ASMAtomicDecU32(&pEndpoint->cTasksCached); + } + + pTask->pNext = NULL; + + return pTask; +} + +PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint) +{ + /* + * Get pending tasks. + */ + PPDMACTASKFILE pTasks = ASMAtomicXchgPtrT(&pEndpoint->pTasksNewHead, NULL, PPDMACTASKFILE); + + /* Reverse the list to process in FIFO order. */ + if (pTasks) + { + PPDMACTASKFILE pTask = pTasks; + + pTasks = NULL; + + while (pTask) + { + PPDMACTASKFILE pCur = pTask; + pTask = pTask->pNext; + pCur->pNext = pTasks; + pTasks = pCur; + } + } + + return pTasks; +} + +static void pdmacFileAioMgrWakeup(PPDMACEPFILEMGR pAioMgr) +{ + bool fWokenUp = ASMAtomicXchgBool(&pAioMgr->fWokenUp, true); + if (!fWokenUp) + { + bool fWaitingEventSem = ASMAtomicReadBool(&pAioMgr->fWaitingEventSem); + if (fWaitingEventSem) + { + int rc = RTSemEventSignal(pAioMgr->EventSem); + AssertRC(rc); + } + } +} + +static int pdmacFileAioMgrWaitForBlockingEvent(PPDMACEPFILEMGR pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT enmEvent) +{ + ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, enmEvent); + Assert(!pAioMgr->fBlockingEventPending); + ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, true); + + /* Wakeup the async I/O manager */ + pdmacFileAioMgrWakeup(pAioMgr); + + /* Wait for completion. */ + int rc = RTSemEventWait(pAioMgr->EventSemBlock, RT_INDEFINITE_WAIT); + AssertRC(rc); + + ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, false); + ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID); + + return rc; +} + +int pdmacFileAioMgrAddEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint) +{ + LogFlowFunc(("pAioMgr=%#p pEndpoint=%#p{%s}\n", pAioMgr, pEndpoint, pEndpoint->Core.pszUri)); + + /* Update the assigned I/O manager. */ + ASMAtomicWritePtr(&pEndpoint->pAioMgr, pAioMgr); + + int rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent); + AssertRCReturn(rc, rc); + + ASMAtomicWritePtr(&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint, pEndpoint); + rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT); + ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint); + + RTCritSectLeave(&pAioMgr->CritSectBlockingEvent); + + return rc; +} + +#ifdef SOME_UNUSED_FUNCTION +static int pdmacFileAioMgrRemoveEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint) +{ + int rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent); + AssertRCReturn(rc, rc); + + ASMAtomicWritePtr(&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint, pEndpoint); + rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT); + ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint); + + RTCritSectLeave(&pAioMgr->CritSectBlockingEvent); + + return rc; +} +#endif + +static int pdmacFileAioMgrCloseEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint) +{ + int rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent); + AssertRCReturn(rc, rc); + + ASMAtomicWritePtr(&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint, pEndpoint); + rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT); + ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint); + + RTCritSectLeave(&pAioMgr->CritSectBlockingEvent); + + return rc; +} + +static int pdmacFileAioMgrShutdown(PPDMACEPFILEMGR pAioMgr) +{ + int rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent); + AssertRCReturn(rc, rc); + + rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN); + + RTCritSectLeave(&pAioMgr->CritSectBlockingEvent); + + return rc; +} + +int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask) +{ + PPDMACTASKFILE pNext; + do + { + pNext = pEndpoint->pTasksNewHead; + pTask->pNext = pNext; + } while (!ASMAtomicCmpXchgPtr(&pEndpoint->pTasksNewHead, pTask, pNext)); + + pdmacFileAioMgrWakeup(ASMAtomicReadPtrT(&pEndpoint->pAioMgr, PPDMACEPFILEMGR)); + + return VINF_SUCCESS; +} + +static DECLCALLBACK(void) pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser, int rc) +{ + PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pvUser; + + LogFlowFunc(("pTask=%#p pvUser=%#p rc=%Rrc\n", pTask, pvUser, rc)); + + if (pTask->enmTransferType == PDMACTASKFILETRANSFER_FLUSH) + pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, rc, true); + else + { + Assert((uint32_t)pTask->DataSeg.cbSeg == pTask->DataSeg.cbSeg && (int32_t)pTask->DataSeg.cbSeg >= 0); + uint32_t uOld = ASMAtomicSubS32(&pTaskFile->cbTransferLeft, (int32_t)pTask->DataSeg.cbSeg); + + /* The first error will be returned. */ + if (RT_FAILURE(rc)) + ASMAtomicCmpXchgS32(&pTaskFile->rc, rc, VINF_SUCCESS); +#ifdef VBOX_WITH_DEBUGGER + else + { + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pTaskFile->Core.pEndpoint; + + /* Overwrite with injected error code. */ + if (pTask->enmTransferType == PDMACTASKFILETRANSFER_READ) + rc = ASMAtomicXchgS32(&pEpFile->rcReqRead, VINF_SUCCESS); + else + rc = ASMAtomicXchgS32(&pEpFile->rcReqWrite, VINF_SUCCESS); + + if (RT_FAILURE(rc)) + ASMAtomicCmpXchgS32(&pTaskFile->rc, rc, VINF_SUCCESS); + } +#endif + + if (!(uOld - pTask->DataSeg.cbSeg) + && !ASMAtomicXchgBool(&pTaskFile->fCompleted, true)) + { +#ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pTaskFile->Core.pEndpoint; + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEpFile->Core.pEpClass; + + /* Check if we should delay completion of the request. */ + if ( ASMAtomicReadU32(&pEpFile->msDelay) > 0 + && ASMAtomicReadU32(&pEpFile->cReqsDelay) > 0) + { + uint64_t tsDelay = pEpFile->msDelay; + + if (pEpFile->msJitter) + tsDelay = (RTRandU32() % 100) > 50 ? pEpFile->msDelay + (RTRandU32() % pEpFile->msJitter) + : pEpFile->msDelay - (RTRandU32() % pEpFile->msJitter); + ASMAtomicDecU32(&pEpFile->cReqsDelay); + + /* Arm the delay. */ + pTaskFile->tsDelayEnd = RTTimeProgramMilliTS() + tsDelay; + + /* Append to the list. */ + PPDMASYNCCOMPLETIONTASKFILE pHead = NULL; + do + { + pHead = ASMAtomicReadPtrT(&pEpFile->pDelayedHead, PPDMASYNCCOMPLETIONTASKFILE); + pTaskFile->pDelayedNext = pHead; + } while (!ASMAtomicCmpXchgPtr(&pEpFile->pDelayedHead, pTaskFile, pHead)); + + if (tsDelay < pEpClassFile->cMilliesNext) + { + ASMAtomicWriteU64(&pEpClassFile->cMilliesNext, tsDelay); + TMTimerSetMillies(pEpClassFile->pTimer, tsDelay); + } + + LogRel(("AIOMgr: Delaying request %#p for %u ms\n", pTaskFile, tsDelay)); + } + else +#endif + pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, pTaskFile->rc, true); + } + } +} + +DECLINLINE(void) pdmacFileEpTaskInit(PPDMASYNCCOMPLETIONTASK pTask, size_t cbTransfer) +{ + PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask; + + Assert((uint32_t)cbTransfer == cbTransfer && (int32_t)cbTransfer >= 0); + ASMAtomicWriteS32(&pTaskFile->cbTransferLeft, (int32_t)cbTransfer); + ASMAtomicWriteBool(&pTaskFile->fCompleted, false); + ASMAtomicWriteS32(&pTaskFile->rc, VINF_SUCCESS); +} + +int pdmacFileEpTaskInitiate(PPDMASYNCCOMPLETIONTASK pTask, + PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off, + PCRTSGSEG paSegments, size_t cSegments, + size_t cbTransfer, PDMACTASKFILETRANSFER enmTransfer) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask; + + Assert( (enmTransfer == PDMACTASKFILETRANSFER_READ) + || (enmTransfer == PDMACTASKFILETRANSFER_WRITE)); + + for (size_t i = 0; i < cSegments; i++) + { + PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile); + AssertPtr(pIoTask); + + pIoTask->pEndpoint = pEpFile; + pIoTask->enmTransferType = enmTransfer; + pIoTask->Off = off; + pIoTask->DataSeg.cbSeg = paSegments[i].cbSeg; + pIoTask->DataSeg.pvSeg = paSegments[i].pvSeg; + pIoTask->pvUser = pTaskFile; + pIoTask->pfnCompleted = pdmacFileEpTaskCompleted; + + /* Send it off to the I/O manager. */ + pdmacFileEpAddTask(pEpFile, pIoTask); + off += paSegments[i].cbSeg; + cbTransfer -= paSegments[i].cbSeg; + } + + AssertMsg(!cbTransfer, ("Incomplete transfer %u bytes left\n", cbTransfer)); + + return VINF_AIO_TASK_PENDING; +} + +/** + * Creates a new async I/O manager. + * + * @returns VBox status code. + * @param pEpClass Pointer to the endpoint class data. + * @param ppAioMgr Where to store the pointer to the new async I/O manager on success. + * @param enmMgrType Wanted manager type - can be overwritten by the global override. + */ +int pdmacFileAioMgrCreate(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass, PPPDMACEPFILEMGR ppAioMgr, + PDMACEPFILEMGRTYPE enmMgrType) +{ + LogFlowFunc((": Entered\n")); + + PPDMACEPFILEMGR pAioMgrNew; + int rc = MMR3HeapAllocZEx(pEpClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, sizeof(PDMACEPFILEMGR), (void **)&pAioMgrNew); + if (RT_SUCCESS(rc)) + { + if (enmMgrType < pEpClass->enmMgrTypeOverride) + pAioMgrNew->enmMgrType = enmMgrType; + else + pAioMgrNew->enmMgrType = pEpClass->enmMgrTypeOverride; + + pAioMgrNew->msBwLimitExpired = RT_INDEFINITE_WAIT; + + rc = RTSemEventCreate(&pAioMgrNew->EventSem); + if (RT_SUCCESS(rc)) + { + rc = RTSemEventCreate(&pAioMgrNew->EventSemBlock); + if (RT_SUCCESS(rc)) + { + rc = RTCritSectInit(&pAioMgrNew->CritSectBlockingEvent); + if (RT_SUCCESS(rc)) + { + /* Init the rest of the manager. */ + if (pAioMgrNew->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE) + rc = pdmacFileAioMgrNormalInit(pAioMgrNew); + + if (RT_SUCCESS(rc)) + { + pAioMgrNew->enmState = PDMACEPFILEMGRSTATE_RUNNING; + + rc = RTThreadCreateF(&pAioMgrNew->Thread, + pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE + ? pdmacFileAioMgrFailsafe + : pdmacFileAioMgrNormal, + pAioMgrNew, + 0, + RTTHREADTYPE_IO, + 0, + "AioMgr%d-%s", pEpClass->cAioMgrs, + pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE + ? "F" + : "N"); + if (RT_SUCCESS(rc)) + { + /* Link it into the list. */ + RTCritSectEnter(&pEpClass->CritSect); + pAioMgrNew->pNext = pEpClass->pAioMgrHead; + if (pEpClass->pAioMgrHead) + pEpClass->pAioMgrHead->pPrev = pAioMgrNew; + pEpClass->pAioMgrHead = pAioMgrNew; + pEpClass->cAioMgrs++; + RTCritSectLeave(&pEpClass->CritSect); + + *ppAioMgr = pAioMgrNew; + + Log(("PDMAC: Successfully created new file AIO Mgr {%s}\n", RTThreadGetName(pAioMgrNew->Thread))); + return VINF_SUCCESS; + } + pdmacFileAioMgrNormalDestroy(pAioMgrNew); + } + RTCritSectDelete(&pAioMgrNew->CritSectBlockingEvent); + } + RTSemEventDestroy(pAioMgrNew->EventSem); + } + RTSemEventDestroy(pAioMgrNew->EventSemBlock); + } + MMR3HeapFree(pAioMgrNew); + } + + LogFlowFunc((": Leave rc=%Rrc\n", rc)); + + return rc; +} + +/** + * Destroys a async I/O manager. + * + * @returns nothing. + * @param pEpClassFile Pointer to globals for the file endpoint class. + * @param pAioMgr The async I/O manager to destroy. + */ +static void pdmacFileAioMgrDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile, PPDMACEPFILEMGR pAioMgr) +{ + int rc = pdmacFileAioMgrShutdown(pAioMgr); + AssertRC(rc); + + /* Unlink from the list. */ + rc = RTCritSectEnter(&pEpClassFile->CritSect); + AssertRC(rc); + + PPDMACEPFILEMGR pPrev = pAioMgr->pPrev; + PPDMACEPFILEMGR pNext = pAioMgr->pNext; + + if (pPrev) + pPrev->pNext = pNext; + else + pEpClassFile->pAioMgrHead = pNext; + + if (pNext) + pNext->pPrev = pPrev; + + pEpClassFile->cAioMgrs--; + rc = RTCritSectLeave(&pEpClassFile->CritSect); + AssertRC(rc); + + /* Free the resources. */ + RTCritSectDelete(&pAioMgr->CritSectBlockingEvent); + RTSemEventDestroy(pAioMgr->EventSem); + RTSemEventDestroy(pAioMgr->EventSemBlock); + if (pAioMgr->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE) + pdmacFileAioMgrNormalDestroy(pAioMgr); + + MMR3HeapFree(pAioMgr); +} + +static int pdmacFileMgrTypeFromName(const char *pszVal, PPDMACEPFILEMGRTYPE penmMgrType) +{ + int rc = VINF_SUCCESS; + + if (!RTStrCmp(pszVal, "Simple")) + *penmMgrType = PDMACEPFILEMGRTYPE_SIMPLE; + else if (!RTStrCmp(pszVal, "Async")) + *penmMgrType = PDMACEPFILEMGRTYPE_ASYNC; + else + rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE; + + return rc; +} + +static const char *pdmacFileMgrTypeToName(PDMACEPFILEMGRTYPE enmMgrType) +{ + if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE) + return "Simple"; + if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC) + return "Async"; + + return NULL; +} + +static int pdmacFileBackendTypeFromName(const char *pszVal, PPDMACFILEEPBACKEND penmBackendType) +{ + int rc = VINF_SUCCESS; + + if (!RTStrCmp(pszVal, "Buffered")) + *penmBackendType = PDMACFILEEPBACKEND_BUFFERED; + else if (!RTStrCmp(pszVal, "NonBuffered")) + *penmBackendType = PDMACFILEEPBACKEND_NON_BUFFERED; + else + rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE; + + return rc; +} + +static const char *pdmacFileBackendTypeToName(PDMACFILEEPBACKEND enmBackendType) +{ + if (enmBackendType == PDMACFILEEPBACKEND_BUFFERED) + return "Buffered"; + if (enmBackendType == PDMACFILEEPBACKEND_NON_BUFFERED) + return "NonBuffered"; + + return NULL; +} + +#ifdef VBOX_WITH_DEBUGGER + +/** + * @callback_method_impl{FNDBGCCMD, The '.injecterror' command.} + */ +static DECLCALLBACK(int) pdmacEpFileErrorInject(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR pArgs, unsigned cArgs) +{ + /* + * Validate input. + */ + DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, -1, cArgs == 3); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 0, pArgs[0].enmType == DBGCVAR_TYPE_STRING); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 1, pArgs[1].enmType == DBGCVAR_TYPE_STRING); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 2, pArgs[2].enmType == DBGCVAR_TYPE_NUMBER); + + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile; + pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pUVM->pdm.s.apAsyncCompletionEndpointClass[PDMASYNCCOMPLETIONEPCLASSTYPE_FILE]; + + /* Syntax is "read|write <filename> <status code>" */ + bool fWrite; + if (!RTStrCmp(pArgs[0].u.pszString, "read")) + fWrite = false; + else if (!RTStrCmp(pArgs[0].u.pszString, "write")) + fWrite = true; + else + return DBGCCmdHlpFail(pCmdHlp, pCmd, "invalid transfer direction '%s'", pArgs[0].u.pszString); + + int32_t rcToInject = (int32_t)pArgs[2].u.u64Number; + if ((uint64_t)rcToInject != pArgs[2].u.u64Number) + return DBGCCmdHlpFail(pCmdHlp, pCmd, "The status code '%lld' is out of range", pArgs[0].u.u64Number); + + /* + * Search for the matching endpoint. + */ + RTCritSectEnter(&pEpClassFile->Core.CritSect); + + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpClassFile->Core.pEndpointsHead; + while (pEpFile) + { + if (!RTStrCmp(pArgs[1].u.pszString, RTPathFilename(pEpFile->Core.pszUri))) + break; + pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpFile->Core.pNext; + } + + if (pEpFile) + { + /* + * Do the job. + */ + if (fWrite) + ASMAtomicXchgS32(&pEpFile->rcReqWrite, rcToInject); + else + ASMAtomicXchgS32(&pEpFile->rcReqRead, rcToInject); + + DBGCCmdHlpPrintf(pCmdHlp, "Injected %Rrc into '%s' for %s\n", + (int)rcToInject, pArgs[1].u.pszString, pArgs[0].u.pszString); + } + + RTCritSectLeave(&pEpClassFile->Core.CritSect); + + if (!pEpFile) + return DBGCCmdHlpFail(pCmdHlp, pCmd, "No file with name '%s' found", pArgs[1].u.pszString); + return VINF_SUCCESS; +} + +# ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY +/** + * @callback_method_impl{FNDBGCCMD, The '.injectdelay' command.} + */ +static DECLCALLBACK(int) pdmacEpFileDelayInject(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR pArgs, unsigned cArgs) +{ + /* + * Validate input. + */ + DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, -1, cArgs >= 3); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 0, pArgs[0].enmType == DBGCVAR_TYPE_STRING); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 1, pArgs[1].enmType == DBGCVAR_TYPE_STRING); + DBGC_CMDHLP_ASSERT_PARSER_RET(pCmdHlp, pCmd, 2, pArgs[2].enmType == DBGCVAR_TYPE_NUMBER); + + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile; + pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pUVM->pdm.s.apAsyncCompletionEndpointClass[PDMASYNCCOMPLETIONEPCLASSTYPE_FILE]; + + /* Syntax is "read|write|flush|any <filename> <delay> [reqs]" */ + PDMACFILEREQTYPEDELAY enmDelayType = PDMACFILEREQTYPEDELAY_ANY; + if (!RTStrCmp(pArgs[0].u.pszString, "read")) + enmDelayType = PDMACFILEREQTYPEDELAY_READ; + else if (!RTStrCmp(pArgs[0].u.pszString, "write")) + enmDelayType = PDMACFILEREQTYPEDELAY_WRITE; + else if (!RTStrCmp(pArgs[0].u.pszString, "flush")) + enmDelayType = PDMACFILEREQTYPEDELAY_FLUSH; + else if (!RTStrCmp(pArgs[0].u.pszString, "any")) + enmDelayType = PDMACFILEREQTYPEDELAY_ANY; + else + return DBGCCmdHlpFail(pCmdHlp, pCmd, "invalid transfer direction '%s'", pArgs[0].u.pszString); + + uint32_t msDelay = (uint32_t)pArgs[2].u.u64Number; + if ((uint64_t)msDelay != pArgs[2].u.u64Number) + return DBGCCmdHlpFail(pCmdHlp, pCmd, "The delay '%lld' is out of range", pArgs[0].u.u64Number); + + uint32_t cReqsDelay = 1; + uint32_t msJitter = 0; + if (cArgs >= 4) + msJitter = (uint32_t)pArgs[3].u.u64Number; + if (cArgs == 5) + cReqsDelay = (uint32_t)pArgs[4].u.u64Number; + + /* + * Search for the matching endpoint. + */ + RTCritSectEnter(&pEpClassFile->Core.CritSect); + + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpClassFile->Core.pEndpointsHead; + while (pEpFile) + { + if (!RTStrCmp(pArgs[1].u.pszString, RTPathFilename(pEpFile->Core.pszUri))) + break; + pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpFile->Core.pNext; + } + + if (pEpFile) + { + ASMAtomicWriteSize(&pEpFile->enmTypeDelay, enmDelayType); + ASMAtomicWriteU32(&pEpFile->msDelay, msDelay); + ASMAtomicWriteU32(&pEpFile->msJitter, msJitter); + ASMAtomicWriteU32(&pEpFile->cReqsDelay, cReqsDelay); + + DBGCCmdHlpPrintf(pCmdHlp, "Injected delay for the next %u requests of %u ms into '%s' for %s\n", + cReqsDelay, msDelay, pArgs[1].u.pszString, pArgs[0].u.pszString); + } + + RTCritSectLeave(&pEpClassFile->Core.CritSect); + + if (!pEpFile) + return DBGCCmdHlpFail(pCmdHlp, pCmd, "No file with name '%s' found", pArgs[1].u.pszString); + return VINF_SUCCESS; +} + +static DECLCALLBACK(void) pdmacR3TimerCallback(PVM pVM, PTMTIMER pTimer, void *pvUser) +{ + uint64_t tsCur = RTTimeProgramMilliTS(); + uint64_t cMilliesNext = UINT64_MAX; + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pvUser; + + ASMAtomicWriteU64(&pEpClassFile->cMilliesNext, UINT64_MAX); + + /* Go through all endpoints and check for expired requests. */ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpClassFile->Core.pEndpointsHead; + + while (pEpFile) + { + /* Check for an expired delay. */ + if (pEpFile->pDelayedHead != NULL) + { + PPDMASYNCCOMPLETIONTASKFILE pTaskFile = ASMAtomicXchgPtrT(&pEpFile->pDelayedHead, NULL, PPDMASYNCCOMPLETIONTASKFILE); + + while (pTaskFile) + { + PPDMASYNCCOMPLETIONTASKFILE pTmp = pTaskFile; + pTaskFile = pTaskFile->pDelayedNext; + + if (tsCur >= pTmp->tsDelayEnd) + { + LogRel(("AIOMgr: Delayed request %#p completed\n", pTmp)); + pdmR3AsyncCompletionCompleteTask(&pTmp->Core, pTmp->rc, true); + } + else + { + /* Prepend to the delayed list again. */ + PPDMASYNCCOMPLETIONTASKFILE pHead = NULL; + + if (pTmp->tsDelayEnd - tsCur < cMilliesNext) + cMilliesNext = pTmp->tsDelayEnd - tsCur; + + do + { + pHead = ASMAtomicReadPtrT(&pEpFile->pDelayedHead, PPDMASYNCCOMPLETIONTASKFILE); + pTmp->pDelayedNext = pHead; + } while (!ASMAtomicCmpXchgPtr(&pEpFile->pDelayedHead, pTmp, pHead)); + } + } + } + + pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEpFile->Core.pNext; + } + + if (cMilliesNext < pEpClassFile->cMilliesNext) + { + ASMAtomicWriteU64(&pEpClassFile->cMilliesNext, cMilliesNext); + TMTimerSetMillies(pEpClassFile->pTimer, cMilliesNext); + } +} + +# endif /* PDM_ASYNC_COMPLETION_FILE_WITH_DELAY */ + +#endif /* VBOX_WITH_DEBUGGER */ + +static DECLCALLBACK(int) pdmacFileInitialize(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals, PCFGMNODE pCfgNode) +{ + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals; + RTFILEAIOLIMITS AioLimits; /** < Async I/O limitations. */ + + int rc = RTFileAioGetLimits(&AioLimits); +#ifdef DEBUG + if (RT_SUCCESS(rc) && RTEnvExist("VBOX_ASYNC_IO_FAILBACK")) + rc = VERR_ENV_VAR_NOT_FOUND; +#endif + if (RT_FAILURE(rc)) + { + LogRel(("AIO: Async I/O manager not supported (rc=%Rrc). Falling back to simple manager\n", rc)); + pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_SIMPLE; + pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_BUFFERED; + } + else + { + pEpClassFile->uBitmaskAlignment = AioLimits.cbBufferAlignment ? ~((RTR3UINTPTR)AioLimits.cbBufferAlignment - 1) : RTR3UINTPTR_MAX; + pEpClassFile->cReqsOutstandingMax = AioLimits.cReqsOutstandingMax; + + if (pCfgNode) + { + /* Query the default manager type */ + char *pszVal = NULL; + rc = CFGMR3QueryStringAllocDef(pCfgNode, "IoMgr", &pszVal, "Async"); + AssertLogRelRCReturn(rc, rc); + + rc = pdmacFileMgrTypeFromName(pszVal, &pEpClassFile->enmMgrTypeOverride); + MMR3HeapFree(pszVal); + if (RT_FAILURE(rc)) + return rc; + + LogRel(("AIOMgr: Default manager type is '%s'\n", pdmacFileMgrTypeToName(pEpClassFile->enmMgrTypeOverride))); + + /* Query default backend type */ + rc = CFGMR3QueryStringAllocDef(pCfgNode, "FileBackend", &pszVal, "NonBuffered"); + AssertLogRelRCReturn(rc, rc); + + rc = pdmacFileBackendTypeFromName(pszVal, &pEpClassFile->enmEpBackendDefault); + MMR3HeapFree(pszVal); + if (RT_FAILURE(rc)) + return rc; + + LogRel(("AIOMgr: Default file backend is '%s'\n", pdmacFileBackendTypeToName(pEpClassFile->enmEpBackendDefault))); + +#ifdef RT_OS_LINUX + if ( pEpClassFile->enmMgrTypeOverride == PDMACEPFILEMGRTYPE_ASYNC + && pEpClassFile->enmEpBackendDefault == PDMACFILEEPBACKEND_BUFFERED) + { + LogRel(("AIOMgr: Linux does not support buffered async I/O, changing to non buffered\n")); + pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED; + } +#endif + } + else + { + /* No configuration supplied, set defaults */ + pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED; + pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_ASYNC; + } + } + + /* Init critical section. */ + rc = RTCritSectInit(&pEpClassFile->CritSect); + +#ifdef VBOX_WITH_DEBUGGER + /* Install the error injection handler. */ + if (RT_SUCCESS(rc)) + { + rc = DBGCRegisterCommands(&g_aCmds[0], RT_ELEMENTS(g_aCmds)); + AssertRC(rc); + } + +#ifdef PDM_ASYNC_COMPLETION_FILE_WITH_DELAY + rc = TMR3TimerCreateInternal(pEpClassFile->Core.pVM, TMCLOCK_REAL, pdmacR3TimerCallback, pEpClassFile, "AC Delay", &pEpClassFile->pTimer); + AssertRC(rc); + pEpClassFile->cMilliesNext = UINT64_MAX; +#endif +#endif + + return rc; +} + +static DECLCALLBACK(void) pdmacFileTerminate(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals) +{ + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals; + + /* All endpoints should be closed at this point. */ + AssertMsg(!pEpClassFile->Core.pEndpointsHead, ("There are still endpoints left\n")); + + /* Destroy all left async I/O managers. */ + while (pEpClassFile->pAioMgrHead) + pdmacFileAioMgrDestroy(pEpClassFile, pEpClassFile->pAioMgrHead); + + RTCritSectDelete(&pEpClassFile->CritSect); +} + +static DECLCALLBACK(int) pdmacFileEpInitialize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, + const char *pszUri, uint32_t fFlags) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass; + PDMACEPFILEMGRTYPE enmMgrType = pEpClassFile->enmMgrTypeOverride; + PDMACFILEEPBACKEND enmEpBackend = pEpClassFile->enmEpBackendDefault; + + AssertMsgReturn((fFlags & ~(PDMACEP_FILE_FLAGS_READ_ONLY | PDMACEP_FILE_FLAGS_DONT_LOCK | PDMACEP_FILE_FLAGS_HOST_CACHE_ENABLED)) == 0, + ("PDMAsyncCompletion: Invalid flag specified\n"), VERR_INVALID_PARAMETER); + + unsigned fFileFlags = RTFILE_O_OPEN; + + /* + * Revert to the simple manager and the buffered backend if + * the host cache should be enabled. + */ + if (fFlags & PDMACEP_FILE_FLAGS_HOST_CACHE_ENABLED) + { + enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE; + enmEpBackend = PDMACFILEEPBACKEND_BUFFERED; + } + + if (fFlags & PDMACEP_FILE_FLAGS_READ_ONLY) + fFileFlags |= RTFILE_O_READ | RTFILE_O_DENY_NONE; + else + { + fFileFlags |= RTFILE_O_READWRITE; + + /* + * Opened in read/write mode. Check whether the caller wants to + * avoid the lock. Return an error in case caching is enabled + * because this can lead to data corruption. + */ + if (fFlags & PDMACEP_FILE_FLAGS_DONT_LOCK) + fFileFlags |= RTFILE_O_DENY_NONE; + else + fFileFlags |= RTFILE_O_DENY_WRITE; + } + + if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC) + fFileFlags |= RTFILE_O_ASYNC_IO; + + int rc; + if (enmEpBackend == PDMACFILEEPBACKEND_NON_BUFFERED) + { + /* + * We only disable the cache if the size of the file is a multiple of 512. + * Certain hosts like Windows, Linux and Solaris require that transfer sizes + * are aligned to the volume sector size. + * If not we just make sure that the data is written to disk with RTFILE_O_WRITE_THROUGH + * which will trash the host cache but ensures that the host cache will not + * contain dirty buffers. + */ + RTFILE hFile; + rc = RTFileOpen(&hFile, pszUri, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE); + if (RT_SUCCESS(rc)) + { + uint64_t cbSize; + + rc = RTFileQuerySize(hFile, &cbSize); + + if (RT_SUCCESS(rc) && ((cbSize % 512) == 0)) + fFileFlags |= RTFILE_O_NO_CACHE; + else + { + /* Downgrade to the buffered backend */ + enmEpBackend = PDMACFILEEPBACKEND_BUFFERED; + +#ifdef RT_OS_LINUX + fFileFlags &= ~RTFILE_O_ASYNC_IO; + enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE; +#endif + } + RTFileClose(hFile); + } + } + + /* Open with final flags. */ + rc = RTFileOpen(&pEpFile->hFile, pszUri, fFileFlags); + if ( rc == VERR_INVALID_FUNCTION + || rc == VERR_INVALID_PARAMETER) + { + LogRel(("AIOMgr: pdmacFileEpInitialize: RTFileOpen %s / %08x failed with %Rrc\n", + pszUri, fFileFlags, rc)); + /* + * Solaris doesn't support directio on ZFS so far. :-\ + * Trying to enable it returns VERR_INVALID_FUNCTION + * (ENOTTY). Remove it and hope for the best. + * ZFS supports write throttling in case applications + * write more data than can be synced to the disk + * without blocking the whole application. + * + * On Linux we have the same problem with cifs. + * Have to disable async I/O here too because it requires O_DIRECT. + */ + fFileFlags &= ~RTFILE_O_NO_CACHE; + enmEpBackend = PDMACFILEEPBACKEND_BUFFERED; + +#ifdef RT_OS_LINUX + fFileFlags &= ~RTFILE_O_ASYNC_IO; + enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE; +#endif + + /* Open again. */ + rc = RTFileOpen(&pEpFile->hFile, pszUri, fFileFlags); + + if (RT_FAILURE(rc)) + { + LogRel(("AIOMgr: pdmacFileEpInitialize: RTFileOpen %s / %08x failed AGAIN(!) with %Rrc\n", + pszUri, fFileFlags, rc)); + } + } + + if (RT_SUCCESS(rc)) + { + pEpFile->fFlags = fFileFlags; + + rc = RTFileQuerySize(pEpFile->hFile, (uint64_t *)&pEpFile->cbFile); + if (RT_SUCCESS(rc)) + { + /* Initialize the segment cache */ + rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, + sizeof(PDMACTASKFILE), + (void **)&pEpFile->pTasksFreeHead); + if (RT_SUCCESS(rc)) + { + PPDMACEPFILEMGR pAioMgr = NULL; + + pEpFile->pTasksFreeTail = pEpFile->pTasksFreeHead; + pEpFile->cTasksCached = 0; + pEpFile->enmBackendType = enmEpBackend; + /* + * Disable async flushes on Solaris for now. + * They cause weird hangs which needs more investigations. + */ +#ifndef RT_OS_SOLARIS + pEpFile->fAsyncFlushSupported = true; +#else + pEpFile->fAsyncFlushSupported = false; +#endif + + if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE) + { + /* Simple mode. Every file has its own async I/O manager. */ + rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, PDMACEPFILEMGRTYPE_SIMPLE); + } + else + { + pAioMgr = pEpClassFile->pAioMgrHead; + + /* Check for an idling manager of the same type */ + while (pAioMgr) + { + if (pAioMgr->enmMgrType == enmMgrType) + break; + pAioMgr = pAioMgr->pNext; + } + + if (!pAioMgr) + rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, enmMgrType); + } + + if (RT_SUCCESS(rc)) + { + pEpFile->AioMgr.pTreeRangesLocked = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE)); + if (!pEpFile->AioMgr.pTreeRangesLocked) + rc = VERR_NO_MEMORY; + else + { + pEpFile->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE; + + /* Assign the endpoint to the thread. */ + rc = pdmacFileAioMgrAddEndpoint(pAioMgr, pEpFile); + if (RT_FAILURE(rc)) + { + RTMemFree(pEpFile->AioMgr.pTreeRangesLocked); + MMR3HeapFree(pEpFile->pTasksFreeHead); + } + } + } + else if (rc == VERR_FILE_AIO_INSUFFICIENT_EVENTS) + { + PUVM pUVM = VMR3GetUVM(pEpClassFile->Core.pVM); +#if defined(RT_OS_LINUX) + rc = VMR3SetError(pUVM, rc, RT_SRC_POS, + N_("Failed to create I/O manager for VM due to insufficient resources on the host. " + "Either increase the amount of allowed events in /proc/sys/fs/aio-max-nr or enable " + "the host I/O cache")); +#else + rc = VMR3SetError(pUVM, rc, RT_SRC_POS, + N_("Failed to create I/O manager for VM due to insufficient resources on the host. " + "Enable the host I/O cache")); +#endif + } + else + { + PUVM pUVM = VMR3GetUVM(pEpClassFile->Core.pVM); + rc = VMR3SetError(pUVM, rc, RT_SRC_POS, + N_("Failed to create I/O manager for VM due to an unknown error")); + } + } + } + + if (RT_FAILURE(rc)) + RTFileClose(pEpFile->hFile); + } + +#ifdef VBOX_WITH_STATISTICS + if (RT_SUCCESS(rc)) + { + STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatRead, + STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS, + STAMUNIT_TICKS_PER_CALL, "Time taken to read from the endpoint", + "/PDM/AsyncCompletion/File/%s/%d/Read", RTPathFilename(pEpFile->Core.pszUri), pEpFile->Core.iStatId); + + STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatWrite, + STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS, + STAMUNIT_TICKS_PER_CALL, "Time taken to write to the endpoint", + "/PDM/AsyncCompletion/File/%s/%d/Write", RTPathFilename(pEpFile->Core.pszUri), pEpFile->Core.iStatId); + } +#endif + + if (RT_SUCCESS(rc)) + LogRel(("AIOMgr: Endpoint for file '%s' (flags %08x) created successfully\n", pszUri, pEpFile->fFlags)); + + return rc; +} + +static DECLCALLBACK(int) pdmacFileEpRangesLockedDestroy(PAVLRFOFFNODECORE pNode, void *pvUser) +{ + NOREF(pNode); NOREF(pvUser); + AssertMsgFailed(("The locked ranges tree should be empty at that point\n")); + return VINF_SUCCESS; +} + +static DECLCALLBACK(int) pdmacFileEpClose(PPDMASYNCCOMPLETIONENDPOINT pEndpoint) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass; + + /* Make sure that all tasks finished for this endpoint. */ + int rc = pdmacFileAioMgrCloseEndpoint(pEpFile->pAioMgr, pEpFile); + AssertRC(rc); + + /* + * If the async I/O manager is in failsafe mode this is the only endpoint + * he processes and thus can be destroyed now. + */ + if (pEpFile->pAioMgr->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE) + pdmacFileAioMgrDestroy(pEpClassFile, pEpFile->pAioMgr); + + /* Free cached tasks. */ + PPDMACTASKFILE pTask = pEpFile->pTasksFreeHead; + + while (pTask) + { + PPDMACTASKFILE pTaskFree = pTask; + pTask = pTask->pNext; + MMR3HeapFree(pTaskFree); + } + + /* Destroy the locked ranges tree now. */ + RTAvlrFileOffsetDestroy(pEpFile->AioMgr.pTreeRangesLocked, pdmacFileEpRangesLockedDestroy, NULL); + RTMemFree(pEpFile->AioMgr.pTreeRangesLocked); + pEpFile->AioMgr.pTreeRangesLocked = NULL; + + RTFileClose(pEpFile->hFile); + +#ifdef VBOX_WITH_STATISTICS + /* Not sure if this might be unnecessary because of similar statement in pdmR3AsyncCompletionStatisticsDeregister? */ + STAMR3DeregisterF(pEpClassFile->Core.pVM->pUVM, "/PDM/AsyncCompletion/File/%s/*", RTPathFilename(pEpFile->Core.pszUri)); +#endif + + return VINF_SUCCESS; +} + +static DECLCALLBACK(int) pdmacFileEpRead(PPDMASYNCCOMPLETIONTASK pTask, + PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off, + PCRTSGSEG paSegments, size_t cSegments, + size_t cbRead) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + + LogFlowFunc(("pTask=%#p pEndpoint=%#p off=%RTfoff paSegments=%#p cSegments=%zu cbRead=%zu\n", + pTask, pEndpoint, off, paSegments, cSegments, cbRead)); + + if (RT_UNLIKELY((uint64_t)off + cbRead > pEpFile->cbFile)) + return VERR_EOF; + + STAM_PROFILE_ADV_START(&pEpFile->StatRead, Read); + pdmacFileEpTaskInit(pTask, cbRead); + int rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbRead, + PDMACTASKFILETRANSFER_READ); + STAM_PROFILE_ADV_STOP(&pEpFile->StatRead, Read); + + return rc; +} + +static DECLCALLBACK(int) pdmacFileEpWrite(PPDMASYNCCOMPLETIONTASK pTask, + PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off, + PCRTSGSEG paSegments, size_t cSegments, + size_t cbWrite) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + + if (RT_UNLIKELY(pEpFile->fReadonly)) + return VERR_NOT_SUPPORTED; + + STAM_PROFILE_ADV_START(&pEpFile->StatWrite, Write); + + pdmacFileEpTaskInit(pTask, cbWrite); + + int rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbWrite, + PDMACTASKFILETRANSFER_WRITE); + + STAM_PROFILE_ADV_STOP(&pEpFile->StatWrite, Write); + + return rc; +} + +static DECLCALLBACK(int) pdmacFileEpFlush(PPDMASYNCCOMPLETIONTASK pTask, + PPDMASYNCCOMPLETIONENDPOINT pEndpoint) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask; + + if (RT_UNLIKELY(pEpFile->fReadonly)) + return VERR_NOT_SUPPORTED; + + pdmacFileEpTaskInit(pTask, 0); + + PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile); + if (RT_UNLIKELY(!pIoTask)) + return VERR_NO_MEMORY; + + pIoTask->pEndpoint = pEpFile; + pIoTask->enmTransferType = PDMACTASKFILETRANSFER_FLUSH; + pIoTask->pvUser = pTaskFile; + pIoTask->pfnCompleted = pdmacFileEpTaskCompleted; + pdmacFileEpAddTask(pEpFile, pIoTask); + + return VINF_AIO_TASK_PENDING; +} + +static DECLCALLBACK(int) pdmacFileEpGetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t *pcbSize) +{ + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + + *pcbSize = ASMAtomicReadU64(&pEpFile->cbFile); + + return VINF_SUCCESS; +} + +static DECLCALLBACK(int) pdmacFileEpSetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t cbSize) +{ + int rc; + PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint; + + rc = RTFileSetSize(pEpFile->hFile, cbSize); + if (RT_SUCCESS(rc)) + ASMAtomicWriteU64(&pEpFile->cbFile, cbSize); + + return rc; +} + +const PDMASYNCCOMPLETIONEPCLASSOPS g_PDMAsyncCompletionEndpointClassFile = +{ + /* u32Version */ + PDMAC_EPCLASS_OPS_VERSION, + /* pcszName */ + "File", + /* enmClassType */ + PDMASYNCCOMPLETIONEPCLASSTYPE_FILE, + /* cbEndpointClassGlobal */ + sizeof(PDMASYNCCOMPLETIONEPCLASSFILE), + /* cbEndpoint */ + sizeof(PDMASYNCCOMPLETIONENDPOINTFILE), + /* cbTask */ + sizeof(PDMASYNCCOMPLETIONTASKFILE), + /* pfnInitialize */ + pdmacFileInitialize, + /* pfnTerminate */ + pdmacFileTerminate, + /* pfnEpInitialize. */ + pdmacFileEpInitialize, + /* pfnEpClose */ + pdmacFileEpClose, + /* pfnEpRead */ + pdmacFileEpRead, + /* pfnEpWrite */ + pdmacFileEpWrite, + /* pfnEpFlush */ + pdmacFileEpFlush, + /* pfnEpGetSize */ + pdmacFileEpGetSize, + /* pfnEpSetSize */ + pdmacFileEpSetSize, + /* u32VersionEnd */ + PDMAC_EPCLASS_OPS_VERSION +}; + |