PDMAsyncCompletionFile.cpp@ 30060

Last change on this file since 30060 was 29587, checked in by vboxsync, 14 years ago
AsyncCompletion: Fix hang when closing the VM and flush the cache
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1	/* $Id: PDMAsyncCompletionFile.cpp 29587 2010-05-17 21:42:26Z vboxsync $ */
2	/** @file
3	* PDM Async I/O - Transport data asynchronous in R3 using EMT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2009 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PDM_ASYNC_COMPLETION
23	#include "PDMInternal.h"
24	#include <VBox/pdm.h>
25	#include <VBox/mm.h>
26	#include <VBox/vm.h>
27	#include <VBox/err.h>
28	#include <VBox/log.h>
29
30	#include <iprt/asm.h>
31	#include <iprt/assert.h>
32	#include <iprt/critsect.h>
33	#include <iprt/env.h>
34	#include <iprt/file.h>
35	#include <iprt/mem.h>
36	#include <iprt/semaphore.h>
37	#include <iprt/string.h>
38	#include <iprt/thread.h>
39	#include <iprt/path.h>
40
41	#include "PDMAsyncCompletionFileInternal.h"
42
43	/**
44	* Frees a task.
45	*
46	* @returns nothing.
47	* @param pEndpoint Pointer to the endpoint the segment was for.
48	* @param pTask The task to free.
49	*/
50	void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
51	PPDMACTASKFILE pTask)
52	{
53	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
54
55	LogFlowFunc((": pEndpoint=%p pTask=%p\n", pEndpoint, pTask));
56
57	/* Try the per endpoint cache first. */
58	if (pEndpoint->cTasksCached < pEpClass->cTasksCacheMax)
59	{
60	/* Add it to the list. */
61	pEndpoint->pTasksFreeTail->pNext = pTask;
62	pEndpoint->pTasksFreeTail = pTask;
63	ASMAtomicIncU32(&pEndpoint->cTasksCached);
64	}
65	else
66	{
67	Log(("Freeing task %p because all caches are full\n", pTask));
68	MMR3HeapFree(pTask);
69	}
70	}
71
72	/**
73	* Allocates a task segment
74	*
75	* @returns Pointer to the new task segment or NULL
76	* @param pEndpoint Pointer to the endpoint
77	*/
78	PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
79	{
80	PPDMACTASKFILE pTask = NULL;
81
82	/* Try the small per endpoint cache first. */
83	if (pEndpoint->pTasksFreeHead == pEndpoint->pTasksFreeTail)
84	{
85	/* Try the bigger endpoint class cache. */
86	PPDMASYNCCOMPLETIONEPCLASSFILE pEndpointClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
87
88	/*
89	* Allocate completely new.
90	* If this fails we return NULL.
91	*/
92	int rc = MMR3HeapAllocZEx(pEndpointClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
93	sizeof(PDMACTASKFILE),
94	(void **)&pTask);
95	if (RT_FAILURE(rc))
96	pTask = NULL;
97
98	LogFlow(("Allocated task %p\n", pTask));
99	}
100	else
101	{
102	/* Grab a free task from the head. */
103	AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contains more than one element\n"));
104
105	pTask = pEndpoint->pTasksFreeHead;
106	pEndpoint->pTasksFreeHead = pTask->pNext;
107	ASMAtomicDecU32(&pEndpoint->cTasksCached);
108	}
109
110	pTask->pNext = NULL;
111
112	return pTask;
113	}
114
115	PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
116	{
117	PPDMACTASKFILE pTasks = NULL;
118
119	/*
120	* Get pending tasks.
121	*/
122	pTasks = (PPDMACTASKFILE)ASMAtomicXchgPtr((void * volatile *)&pEndpoint->pTasksNewHead, NULL);
123
124	/* Reverse the list to process in FIFO order. */
125	if (pTasks)
126	{
127	PPDMACTASKFILE pTask = pTasks;
128
129	pTasks = NULL;
130
131	while (pTask)
132	{
133	PPDMACTASKFILE pCur = pTask;
134	pTask = pTask->pNext;
135	pCur->pNext = pTasks;
136	pTasks = pCur;
137	}
138	}
139
140	return pTasks;
141	}
142
143	static void pdmacFileAioMgrWakeup(PPDMACEPFILEMGR pAioMgr)
144	{
145	bool fWokenUp = ASMAtomicXchgBool(&pAioMgr->fWokenUp, true);
146
147	if (!fWokenUp)
148	{
149	int rc = VINF_SUCCESS;
150	bool fWaitingEventSem = ASMAtomicReadBool(&pAioMgr->fWaitingEventSem);
151
152	if (fWaitingEventSem)
153	rc = RTSemEventSignal(pAioMgr->EventSem);
154
155	AssertRC(rc);
156	}
157	}
158
159	static int pdmacFileAioMgrWaitForBlockingEvent(PPDMACEPFILEMGR pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT enmEvent)
160	{
161	int rc = VINF_SUCCESS;
162
163	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, enmEvent);
164	Assert(!pAioMgr->fBlockingEventPending);
165	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, true);
166
167	/* Wakeup the async I/O manager */
168	pdmacFileAioMgrWakeup(pAioMgr);
169
170	/* Wait for completion. */
171	rc = RTSemEventWait(pAioMgr->EventSemBlock, RT_INDEFINITE_WAIT);
172	AssertRC(rc);
173
174	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, false);
175	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID);
176
177	return rc;
178	}
179
180	int pdmacFileAioMgrAddEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
181	{
182	int rc;
183
184	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
185	AssertRCReturn(rc, rc);
186
187	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint, pEndpoint);
188	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT);
189
190	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
191
192	if (RT_SUCCESS(rc))
193	ASMAtomicWritePtr((void * volatile *)&pEndpoint->pAioMgr, pAioMgr);
194
195	return rc;
196	}
197
198	static int pdmacFileAioMgrRemoveEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
199	{
200	int rc;
201
202	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
203	AssertRCReturn(rc, rc);
204
205	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint, pEndpoint);
206	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT);
207
208	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
209
210	return rc;
211	}
212
213	static int pdmacFileAioMgrCloseEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
214	{
215	int rc;
216
217	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
218	AssertRCReturn(rc, rc);
219
220	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint, pEndpoint);
221	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT);
222
223	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
224
225	return rc;
226	}
227
228	static int pdmacFileAioMgrShutdown(PPDMACEPFILEMGR pAioMgr)
229	{
230	int rc;
231
232	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
233	AssertRCReturn(rc, rc);
234
235	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN);
236
237	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
238
239	return rc;
240	}
241
242	int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask)
243	{
244	PPDMACTASKFILE pNext;
245	do
246	{
247	pNext = pEndpoint->pTasksNewHead;
248	pTask->pNext = pNext;
249	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pEndpoint->pTasksNewHead, (void )pTask, (void *)pNext));
250
251	pdmacFileAioMgrWakeup((PPDMACEPFILEMGR)ASMAtomicReadPtr((void * volatile *)&pEndpoint->pAioMgr));
252
253	return VINF_SUCCESS;
254	}
255
256	void pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser, int rc)
257	{
258	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pvUser;
259
260	LogFlowFunc(("pTask=%#p pvUser=%#p rc=%Rrc\n", pTask, pvUser, rc));
261
262	if (pTask->enmTransferType == PDMACTASKFILETRANSFER_FLUSH)
263	{
264	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, rc, true);
265	}
266	else
267	{
268	Assert((uint32_t)pTask->DataSeg.cbSeg == pTask->DataSeg.cbSeg && (int32_t)pTask->DataSeg.cbSeg >= 0);
269	uint32_t uOld = ASMAtomicSubS32(&pTaskFile->cbTransferLeft, (int32_t)pTask->DataSeg.cbSeg);
270
271	/* The first error will be returned. */
272	if (RT_FAILURE(rc))
273	ASMAtomicCmpXchgS32(&pTaskFile->rc, rc, VINF_SUCCESS);
274
275	if (!(uOld - pTask->DataSeg.cbSeg)
276	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
277	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, pTaskFile->rc, true);
278	}
279	}
280
281	DECLINLINE(void) pdmacFileEpTaskInit(PPDMASYNCCOMPLETIONTASK pTask, size_t cbTransfer)
282	{
283	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
284
285	Assert((uint32_t)cbTransfer == cbTransfer && (int32_t)cbTransfer >= 0);
286	ASMAtomicWriteS32(&pTaskFile->cbTransferLeft, (int32_t)cbTransfer);
287	ASMAtomicWriteBool(&pTaskFile->fCompleted, false);
288	ASMAtomicWriteS32(&pTaskFile->rc, VINF_SUCCESS);
289	}
290
291	int pdmacFileEpTaskInitiate(PPDMASYNCCOMPLETIONTASK pTask,
292	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
293	PCRTSGSEG paSegments, size_t cSegments,
294	size_t cbTransfer, PDMACTASKFILETRANSFER enmTransfer)
295	{
296	int rc = VINF_SUCCESS;
297	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
298	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
299	PPDMACEPFILEMGR pAioMgr = pEpFile->pAioMgr;
300
301	Assert( (enmTransfer == PDMACTASKFILETRANSFER_READ)
302	\|\| (enmTransfer == PDMACTASKFILETRANSFER_WRITE));
303
304	for (unsigned i = 0; i < cSegments; i++)
305	{
306	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
307	AssertPtr(pIoTask);
308
309	pIoTask->pEndpoint = pEpFile;
310	pIoTask->enmTransferType = enmTransfer;
311	pIoTask->Off = off;
312	pIoTask->DataSeg.cbSeg = paSegments[i].cbSeg;
313	pIoTask->DataSeg.pvSeg = paSegments[i].pvSeg;
314	pIoTask->pvUser = pTaskFile;
315	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
316
317	/* Send it off to the I/O manager. */
318	pdmacFileEpAddTask(pEpFile, pIoTask);
319	off += paSegments[i].cbSeg;
320	cbTransfer -= paSegments[i].cbSeg;
321	}
322
323	AssertMsg(!cbTransfer, ("Incomplete transfer %u bytes left\n", cbTransfer));
324
325	if (ASMAtomicReadS32(&pTaskFile->cbTransferLeft) == 0
326	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
327	pdmR3AsyncCompletionCompleteTask(pTask, pTaskFile->rc, false);
328	else
329	rc = VINF_AIO_TASK_PENDING;
330
331	return rc;
332	}
333
334	/**
335	* Creates a new async I/O manager.
336	*
337	* @returns VBox status code.
338	* @param pEpClass Pointer to the endpoint class data.
339	* @param ppAioMgr Where to store the pointer to the new async I/O manager on success.
340	* @param enmMgrType Wanted manager type - can be overwritten by the global override.
341	*/
342	int pdmacFileAioMgrCreate(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass, PPPDMACEPFILEMGR ppAioMgr,
343	PDMACEPFILEMGRTYPE enmMgrType)
344	{
345	int rc = VINF_SUCCESS;
346	PPDMACEPFILEMGR pAioMgrNew;
347
348	LogFlowFunc((": Entered\n"));
349
350	rc = MMR3HeapAllocZEx(pEpClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, sizeof(PDMACEPFILEMGR), (void **)&pAioMgrNew);
351	if (RT_SUCCESS(rc))
352	{
353	if (enmMgrType < pEpClass->enmMgrTypeOverride)
354	pAioMgrNew->enmMgrType = enmMgrType;
355	else
356	pAioMgrNew->enmMgrType = pEpClass->enmMgrTypeOverride;
357
358	rc = RTSemEventCreate(&pAioMgrNew->EventSem);
359	if (RT_SUCCESS(rc))
360	{
361	rc = RTSemEventCreate(&pAioMgrNew->EventSemBlock);
362	if (RT_SUCCESS(rc))
363	{
364	rc = RTCritSectInit(&pAioMgrNew->CritSectBlockingEvent);
365	if (RT_SUCCESS(rc))
366	{
367	/* Init the rest of the manager. */
368	if (pAioMgrNew->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
369	rc = pdmacFileAioMgrNormalInit(pAioMgrNew);
370
371	if (RT_SUCCESS(rc))
372	{
373	pAioMgrNew->enmState = PDMACEPFILEMGRSTATE_RUNNING;
374
375	rc = RTThreadCreateF(&pAioMgrNew->Thread,
376	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
377	? pdmacFileAioMgrFailsafe
378	: pdmacFileAioMgrNormal,
379	pAioMgrNew,
380	0,
381	RTTHREADTYPE_IO,
382	0,
383	"AioMgr%d-%s", pEpClass->cAioMgrs,
384	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
385	? "F"
386	: "N");
387	if (RT_SUCCESS(rc))
388	{
389	/* Link it into the list. */
390	RTCritSectEnter(&pEpClass->CritSect);
391	pAioMgrNew->pNext = pEpClass->pAioMgrHead;
392	if (pEpClass->pAioMgrHead)
393	pEpClass->pAioMgrHead->pPrev = pAioMgrNew;
394	pEpClass->pAioMgrHead = pAioMgrNew;
395	pEpClass->cAioMgrs++;
396	RTCritSectLeave(&pEpClass->CritSect);
397
398	*ppAioMgr = pAioMgrNew;
399
400	Log(("PDMAC: Successfully created new file AIO Mgr {%s}\n", RTThreadGetName(pAioMgrNew->Thread)));
401	return VINF_SUCCESS;
402	}
403	pdmacFileAioMgrNormalDestroy(pAioMgrNew);
404	}
405	RTCritSectDelete(&pAioMgrNew->CritSectBlockingEvent);
406	}
407	RTSemEventDestroy(pAioMgrNew->EventSem);
408	}
409	RTSemEventDestroy(pAioMgrNew->EventSemBlock);
410	}
411	MMR3HeapFree(pAioMgrNew);
412	}
413
414	LogFlowFunc((": Leave rc=%Rrc\n", rc));
415
416	return rc;
417	}
418
419	/**
420	* Destroys a async I/O manager.
421	*
422	* @returns nothing.
423	* @param pAioMgr The async I/O manager to destroy.
424	*/
425	static void pdmacFileAioMgrDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile, PPDMACEPFILEMGR pAioMgr)
426	{
427	int rc = pdmacFileAioMgrShutdown(pAioMgr);
428	AssertRC(rc);
429
430	/* Unlink from the list. */
431	rc = RTCritSectEnter(&pEpClassFile->CritSect);
432	AssertRC(rc);
433
434	PPDMACEPFILEMGR pPrev = pAioMgr->pPrev;
435	PPDMACEPFILEMGR pNext = pAioMgr->pNext;
436
437	if (pPrev)
438	pPrev->pNext = pNext;
439	else
440	pEpClassFile->pAioMgrHead = pNext;
441
442	if (pNext)
443	pNext->pPrev = pPrev;
444
445	pEpClassFile->cAioMgrs--;
446	rc = RTCritSectLeave(&pEpClassFile->CritSect);
447	AssertRC(rc);
448
449	/* Free the ressources. */
450	RTCritSectDelete(&pAioMgr->CritSectBlockingEvent);
451	RTSemEventDestroy(pAioMgr->EventSem);
452	if (pAioMgr->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
453	pdmacFileAioMgrNormalDestroy(pAioMgr);
454
455	MMR3HeapFree(pAioMgr);
456	}
457
458	static int pdmacFileBwMgrInitialize(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile,
459	PCFGMNODE pCfgNode, PPPDMACFILEBWMGR ppBwMgr)
460	{
461	int rc = VINF_SUCCESS;
462	PPDMACFILEBWMGR pBwMgr = NULL;
463
464	rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
465	sizeof(PDMACFILEBWMGR),
466	(void **)&pBwMgr);
467	if (RT_SUCCESS(rc))
468	{
469	/* Init I/O flow control. */
470	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecMax", &pBwMgr->cbVMTransferPerSecMax, UINT32_MAX);
471	AssertLogRelRCReturn(rc, rc);
472	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecStart", &pBwMgr->cbVMTransferPerSecStart, UINT32_MAX /5 _1M*/);
473	AssertLogRelRCReturn(rc, rc);
474	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecStep", &pBwMgr->cbVMTransferPerSecStep, _1M);
475	AssertLogRelRCReturn(rc, rc);
476
477	pBwMgr->cbVMTransferAllowed = pBwMgr->cbVMTransferPerSecStart;
478	pBwMgr->tsUpdatedLast = RTTimeSystemNanoTS();
479
480	if (pBwMgr->cbVMTransferPerSecMax != UINT32_MAX)
481	LogRel(("AIOMgr: I/O bandwidth limited to %u bytes/sec\n", pBwMgr->cbVMTransferPerSecMax));
482	else
483	LogRel(("AIOMgr: I/O bandwidth not limited\n"));
484
485	*ppBwMgr = pBwMgr;
486	}
487
488	return rc;
489	}
490
491	static void pdmacFileBwMgrDestroy(PPDMACFILEBWMGR pBwMgr)
492	{
493	MMR3HeapFree(pBwMgr);
494	}
495
496	static void pdmacFileBwRef(PPDMACFILEBWMGR pBwMgr)
497	{
498	pBwMgr->cRefs++;
499	}
500
501	static void pdmacFileBwUnref(PPDMACFILEBWMGR pBwMgr)
502	{
503	Assert(pBwMgr->cRefs > 0);
504	pBwMgr->cRefs--;
505	}
506
507	bool pdmacFileBwMgrIsTransferAllowed(PPDMACFILEBWMGR pBwMgr, uint32_t cbTransfer)
508	{
509	bool fAllowed = false;
510
511	LogFlowFunc(("pBwMgr=%p cbTransfer=%u\n", pBwMgr, cbTransfer));
512
513	uint32_t cbOld = ASMAtomicSubU32(&pBwMgr->cbVMTransferAllowed, cbTransfer);
514	if (RT_LIKELY(cbOld >= cbTransfer))
515	fAllowed = true;
516	else
517	{
518	/* We are out of ressources Check if we can update again. */
519	uint64_t tsNow = RTTimeSystemNanoTS();
520	uint64_t tsUpdatedLast = ASMAtomicUoReadU64(&pBwMgr->tsUpdatedLast);
521
522	if (tsNow - tsUpdatedLast >= (100010001000))
523	{
524	if (ASMAtomicCmpXchgU64(&pBwMgr->tsUpdatedLast, tsNow, tsUpdatedLast))
525	{
526	if (pBwMgr->cbVMTransferPerSecStart < pBwMgr->cbVMTransferPerSecMax)
527	{
528	pBwMgr->cbVMTransferPerSecStart = RT_MIN(pBwMgr->cbVMTransferPerSecMax, pBwMgr->cbVMTransferPerSecStart + pBwMgr->cbVMTransferPerSecStep);
529	LogFlow(("AIOMgr: Increasing maximum bandwidth to %u bytes/sec\n", pBwMgr->cbVMTransferPerSecStart));
530	}
531
532	/* Update */
533	ASMAtomicWriteU32(&pBwMgr->cbVMTransferAllowed, pBwMgr->cbVMTransferPerSecStart - cbTransfer);
534	fAllowed = true;
535	LogFlow(("AIOMgr: Refreshed bandwidth\n"));
536	}
537	}
538	else
539	ASMAtomicAddU32(&pBwMgr->cbVMTransferAllowed, cbTransfer);
540	}
541
542	LogFlowFunc(("fAllowed=%RTbool\n", fAllowed));
543
544	return fAllowed;
545	}
546
547	static int pdmacFileMgrTypeFromName(const char *pszVal, PPDMACEPFILEMGRTYPE penmMgrType)
548	{
549	int rc = VINF_SUCCESS;
550
551	if (!RTStrCmp(pszVal, "Simple"))
552	*penmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
553	else if (!RTStrCmp(pszVal, "Async"))
554	*penmMgrType = PDMACEPFILEMGRTYPE_ASYNC;
555	else
556	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
557
558	return rc;
559	}
560
561	static const char *pdmacFileMgrTypeToName(PDMACEPFILEMGRTYPE enmMgrType)
562	{
563	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
564	return "Simple";
565	if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC)
566	return "Async";
567
568	return NULL;
569	}
570
571	static int pdmacFileBackendTypeFromName(const char *pszVal, PPDMACFILEEPBACKEND penmBackendType)
572	{
573	int rc = VINF_SUCCESS;
574
575	if (!RTStrCmp(pszVal, "Buffered"))
576	*penmBackendType = PDMACFILEEPBACKEND_BUFFERED;
577	else if (!RTStrCmp(pszVal, "NonBuffered"))
578	*penmBackendType = PDMACFILEEPBACKEND_NON_BUFFERED;
579	else
580	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
581
582	return rc;
583	}
584
585	static const char *pdmacFileBackendTypeToName(PDMACFILEEPBACKEND enmBackendType)
586	{
587	if (enmBackendType == PDMACFILEEPBACKEND_BUFFERED)
588	return "Buffered";
589	if (enmBackendType == PDMACFILEEPBACKEND_NON_BUFFERED)
590	return "NonBuffered";
591
592	return NULL;
593	}
594
595	static int pdmacFileInitialize(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals, PCFGMNODE pCfgNode)
596	{
597	int rc = VINF_SUCCESS;
598	RTFILEAIOLIMITS AioLimits; /** < Async I/O limitations. */
599
600	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
601
602	rc = RTFileAioGetLimits(&AioLimits);
603	#ifdef DEBUG
604	if (RT_SUCCESS(rc) && RTEnvExist("VBOX_ASYNC_IO_FAILBACK"))
605	rc = VERR_ENV_VAR_NOT_FOUND;
606	#endif
607	if (RT_FAILURE(rc))
608	{
609	LogRel(("AIO: Async I/O manager not supported (rc=%Rrc). Falling back to simple manager\n",
610	rc));
611	pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_SIMPLE;
612	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_BUFFERED;
613	}
614	else
615	{
616	pEpClassFile->uBitmaskAlignment = AioLimits.cbBufferAlignment ? ~((RTR3UINTPTR)AioLimits.cbBufferAlignment - 1) : RTR3UINTPTR_MAX;
617	pEpClassFile->cReqsOutstandingMax = AioLimits.cReqsOutstandingMax;
618
619	if (pCfgNode)
620	{
621	/* Query the default manager type */
622	char *pszVal = NULL;
623	rc = CFGMR3QueryStringAllocDef(pCfgNode, "IoMgr", &pszVal, "Async");
624	AssertLogRelRCReturn(rc, rc);
625
626	rc = pdmacFileMgrTypeFromName(pszVal, &pEpClassFile->enmMgrTypeOverride);
627	MMR3HeapFree(pszVal);
628	if (RT_FAILURE(rc))
629	return rc;
630
631	LogRel(("AIOMgr: Default manager type is \"%s\"\n", pdmacFileMgrTypeToName(pEpClassFile->enmMgrTypeOverride)));
632
633	/* Query default backend type */
634	rc = CFGMR3QueryStringAllocDef(pCfgNode, "FileBackend", &pszVal, "NonBuffered");
635	AssertLogRelRCReturn(rc, rc);
636
637	rc = pdmacFileBackendTypeFromName(pszVal, &pEpClassFile->enmEpBackendDefault);
638	MMR3HeapFree(pszVal);
639	if (RT_FAILURE(rc))
640	return rc;
641
642	LogRel(("AIOMgr: Default file backend is \"%s\"\n", pdmacFileBackendTypeToName(pEpClassFile->enmEpBackendDefault)));
643
644	#ifdef RT_OS_LINUX
645	if ( pEpClassFile->enmMgrTypeOverride == PDMACEPFILEMGRTYPE_ASYNC
646	&& pEpClassFile->enmEpBackendDefault == PDMACFILEEPBACKEND_BUFFERED)
647	{
648	LogRel(("AIOMgr: Linux does not support buffered async I/O, changing to non buffered\n"));
649	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
650	}
651	#endif
652	}
653	else
654	{
655	/* No configuration supplied, set defaults */
656	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
657	}
658	}
659
660	/* Init critical section. */
661	rc = RTCritSectInit(&pEpClassFile->CritSect);
662	if (RT_SUCCESS(rc))
663	{
664	/* Check if the cache was disabled by the user. */
665	rc = CFGMR3QueryBoolDef(pCfgNode, "CacheEnabled", &pEpClassFile->fCacheEnabled, true);
666	AssertLogRelRCReturn(rc, rc);
667
668	if (pEpClassFile->fCacheEnabled)
669	{
670	/* Init cache structure */
671	rc = pdmacFileCacheInit(pEpClassFile, pCfgNode);
672	if (RT_FAILURE(rc))
673	{
674	pEpClassFile->fCacheEnabled = false;
675	LogRel(("AIOMgr: Failed to initialise the cache (rc=%Rrc), disabled caching\n"));
676	}
677	}
678	else
679	LogRel(("AIOMgr: Cache was globally disabled\n"));
680
681	rc = pdmacFileBwMgrInitialize(pEpClassFile, pCfgNode, &pEpClassFile->pBwMgr);
682	if (RT_FAILURE(rc))
683	RTCritSectDelete(&pEpClassFile->CritSect);
684	}
685
686	return rc;
687	}
688
689	static void pdmacFileTerminate(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals)
690	{
691	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
692
693	/* All endpoints should be closed at this point. */
694	AssertMsg(!pEpClassFile->Core.pEndpointsHead, ("There are still endpoints left\n"));
695
696	/* Destroy all left async I/O managers. */
697	while (pEpClassFile->pAioMgrHead)
698	pdmacFileAioMgrDestroy(pEpClassFile, pEpClassFile->pAioMgrHead);
699
700	/* Destroy the cache. */
701	if (pEpClassFile->fCacheEnabled)
702	pdmacFileCacheDestroy(pEpClassFile);
703
704	RTCritSectDelete(&pEpClassFile->CritSect);
705	pdmacFileBwMgrDestroy(pEpClassFile->pBwMgr);
706	}
707
708	static int pdmacFileEpInitialize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint,
709	const char *pszUri, uint32_t fFlags)
710	{
711	int rc = VINF_SUCCESS;
712	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
713	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
714	PDMACEPFILEMGRTYPE enmMgrType = pEpClassFile->enmMgrTypeOverride;
715	PDMACFILEEPBACKEND enmEpBackend = pEpClassFile->enmEpBackendDefault;
716
717	AssertMsgReturn((fFlags & ~(PDMACEP_FILE_FLAGS_READ_ONLY \| PDMACEP_FILE_FLAGS_CACHING)) == 0,
718	("PDMAsyncCompletion: Invalid flag specified\n"), VERR_INVALID_PARAMETER);
719
720	unsigned fFileFlags = fFlags & PDMACEP_FILE_FLAGS_READ_ONLY
721	? RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE
722	: RTFILE_O_READWRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_WRITE;
723
724	if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC)
725	fFileFlags \|= RTFILE_O_ASYNC_IO;
726
727	if (enmEpBackend == PDMACFILEEPBACKEND_NON_BUFFERED)
728	{
729	/*
730	* We only disable the cache if the size of the file is a multiple of 512.
731	* Certain hosts like Windows, Linux and Solaris require that transfer sizes
732	* are aligned to the volume sector size.
733	* If not we just make sure that the data is written to disk with RTFILE_O_WRITE_THROUGH
734	* which will trash the host cache but ensures that the host cache will not
735	* contain dirty buffers.
736	*/
737	RTFILE File = NIL_RTFILE;
738
739	rc = RTFileOpen(&File, pszUri, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
740	if (RT_SUCCESS(rc))
741	{
742	uint64_t cbSize;
743
744	rc = RTFileGetSize(File, &cbSize);
745	if (RT_SUCCESS(rc) && ((cbSize % 512) == 0))
746	fFileFlags \|= RTFILE_O_NO_CACHE;
747	else
748	{
749	/* Downgrade to the buffered backend */
750	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
751
752	#ifdef RT_OS_LINUX
753	fFileFlags &= ~RTFILE_O_ASYNC_IO;
754	enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
755	#endif
756	}
757	RTFileClose(File);
758	}
759	}
760
761	/* Open with final flags. */
762	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
763	if ((rc == VERR_INVALID_FUNCTION) \|\| (rc == VERR_INVALID_PARAMETER))
764	{
765	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed with %Rrc\n",
766	pszUri, fFileFlags, rc));
767	/*
768	* Solaris doesn't support directio on ZFS so far. :-\
769	* Trying to enable it returns VERR_INVALID_FUNCTION
770	* (ENOTTY). Remove it and hope for the best.
771	* ZFS supports write throttling in case applications
772	* write more data than can be synced to the disk
773	* without blocking the whole application.
774	*
775	* On Linux we have the same problem with cifs.
776	* Have to disable async I/O here too because it requires O_DIRECT.
777	*/
778	fFileFlags &= ~RTFILE_O_NO_CACHE;
779	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
780
781	#ifdef RT_OS_LINUX
782	fFileFlags &= ~RTFILE_O_ASYNC_IO;
783	enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
784	#endif
785
786	/* Open again. */
787	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
788
789	if (RT_FAILURE(rc))
790	{
791	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed AGAIN(!) with %Rrc\n",
792	pszUri, fFileFlags, rc));
793	}
794	}
795
796	if (RT_SUCCESS(rc))
797	{
798	pEpFile->fFlags = fFileFlags;
799
800	rc = RTFileGetSize(pEpFile->File, (uint64_t *)&pEpFile->cbFile);
801	if (RT_SUCCESS(rc) && (pEpFile->cbFile == 0))
802	{
803	/* Could be a block device */
804	rc = RTFileSeek(pEpFile->File, 0, RTFILE_SEEK_END, (uint64_t *)&pEpFile->cbFile);
805	}
806
807	if (RT_SUCCESS(rc))
808	{
809	/* Initialize the segment cache */
810	rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
811	sizeof(PDMACTASKFILE),
812	(void **)&pEpFile->pTasksFreeHead);
813	if (RT_SUCCESS(rc))
814	{
815	PPDMACEPFILEMGR pAioMgr = NULL;
816
817	pEpFile->cbEndpoint = pEpFile->cbFile;
818	pEpFile->pTasksFreeTail = pEpFile->pTasksFreeHead;
819	pEpFile->cTasksCached = 0;
820	pEpFile->pBwMgr = pEpClassFile->pBwMgr;
821	pEpFile->enmBackendType = enmEpBackend;
822	pEpFile->fAsyncFlushSupported = true;
823	pdmacFileBwRef(pEpFile->pBwMgr);
824
825	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
826	{
827	/* Simple mode. Every file has its own async I/O manager. */
828	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, PDMACEPFILEMGRTYPE_SIMPLE);
829	AssertRC(rc);
830	}
831	else
832	{
833	if ( (fFlags & PDMACEP_FILE_FLAGS_CACHING)
834	&& (pEpClassFile->fCacheEnabled))
835	{
836	pEpFile->fCaching = true;
837	rc = pdmacFileEpCacheInit(pEpFile, pEpClassFile);
838	if (RT_FAILURE(rc))
839	{
840	LogRel(("AIOMgr: Endpoint for \"%s\" was opened with caching but initializing cache failed. Disabled caching\n", pszUri));
841	pEpFile->fCaching = false;
842	}
843	}
844
845	pAioMgr = pEpClassFile->pAioMgrHead;
846
847	/* Check for an idling manager of the same type */
848	while (pAioMgr)
849	{
850	if (pAioMgr->enmMgrType == enmMgrType)
851	break;
852	pAioMgr = pAioMgr->pNext;
853	}
854
855	if (!pAioMgr)
856	{
857	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, enmMgrType);
858	AssertRC(rc);
859	}
860	}
861
862	pEpFile->AioMgr.pTreeRangesLocked = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE));
863	if (!pEpFile->AioMgr.pTreeRangesLocked)
864	rc = VERR_NO_MEMORY;
865	else
866	{
867	pEpFile->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE;
868
869	/* Assign the endpoint to the thread. */
870	rc = pdmacFileAioMgrAddEndpoint(pAioMgr, pEpFile);
871	if (RT_FAILURE(rc))
872	{
873	RTMemFree(pEpFile->AioMgr.pTreeRangesLocked);
874	MMR3HeapFree(pEpFile->pTasksFreeHead);
875	pdmacFileBwUnref(pEpFile->pBwMgr);
876	}
877	}
878	}
879	}
880
881	if (RT_FAILURE(rc))
882	RTFileClose(pEpFile->File);
883	}
884
885	#ifdef VBOX_WITH_STATISTICS
886	if (RT_SUCCESS(rc))
887	{
888	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatRead,
889	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
890	STAMUNIT_TICKS_PER_CALL, "Time taken to read from the endpoint",
891	"/PDM/AsyncCompletion/File/%s/Read", RTPathFilename(pEpFile->Core.pszUri));
892
893	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatWrite,
894	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
895	STAMUNIT_TICKS_PER_CALL, "Time taken to write to the endpoint",
896	"/PDM/AsyncCompletion/File/%s/Write", RTPathFilename(pEpFile->Core.pszUri));
897	}
898	#endif
899
900	if (RT_SUCCESS(rc))
901	LogRel(("AIOMgr: Endpoint for file '%s' (flags %08x) created successfully\n", pszUri, pEpFile->fFlags));
902
903	return rc;
904	}
905
906	static int pdmacFileEpRangesLockedDestroy(PAVLRFOFFNODECORE pNode, void *pvUser)
907	{
908	AssertMsgFailed(("The locked ranges tree should be empty at that point\n"));
909	return VINF_SUCCESS;
910	}
911
912	static int pdmacFileEpClose(PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
913	{
914	int rc = VINF_SUCCESS;
915	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
916	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
917
918	/* Free the cached data. */
919	if (pEpFile->fCaching)
920	{
921	rc = pdmacFileEpCacheFlush(pEpFile);
922	AssertRC(rc);
923	pdmacFileEpCacheDestroy(pEpFile);
924	}
925
926	/* Make sure that all tasks finished for this endpoint. */
927	rc = pdmacFileAioMgrCloseEndpoint(pEpFile->pAioMgr, pEpFile);
928	AssertRC(rc);
929
930	/* endpoint and real file size should better be equal now. */
931	AssertMsg(pEpFile->cbFile == pEpFile->cbEndpoint,
932	("Endpoint and real file size should match now!\n"));
933
934	/*
935	* If the async I/O manager is in failsafe mode this is the only endpoint
936	* he processes and thus can be destroyed now.
937	*/
938	if (pEpFile->pAioMgr->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
939	pdmacFileAioMgrDestroy(pEpClassFile, pEpFile->pAioMgr);
940
941	/* Free cached tasks. */
942	PPDMACTASKFILE pTask = pEpFile->pTasksFreeHead;
943
944	while (pTask)
945	{
946	PPDMACTASKFILE pTaskFree = pTask;
947	pTask = pTask->pNext;
948	MMR3HeapFree(pTaskFree);
949	}
950
951	/* Remove from the bandwidth manager */
952	pdmacFileBwUnref(pEpFile->pBwMgr);
953
954	/* Destroy the locked ranges tree now. */
955	RTAvlrFileOffsetDestroy(pEpFile->AioMgr.pTreeRangesLocked, pdmacFileEpRangesLockedDestroy, NULL);
956
957	RTFileClose(pEpFile->File);
958
959	#ifdef VBOX_WITH_STATISTICS
960	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatRead);
961	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatWrite);
962	#endif
963
964	return VINF_SUCCESS;
965	}
966
967	static int pdmacFileEpRead(PPDMASYNCCOMPLETIONTASK pTask,
968	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
969	PCRTSGSEG paSegments, size_t cSegments,
970	size_t cbRead)
971	{
972	int rc = VINF_SUCCESS;
973	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
974
975	LogFlowFunc(("pTask=%#p pEndpoint=%#p off=%RTfoff paSegments=%#p cSegments=%zu cbRead=%zu\n",
976	pTask, pEndpoint, off, paSegments, cSegments, cbRead));
977
978	STAM_PROFILE_ADV_START(&pEpFile->StatRead, Read);
979
980	pdmacFileEpTaskInit(pTask, cbRead);
981
982	if (pEpFile->fCaching)
983	rc = pdmacFileEpCacheRead(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
984	off, paSegments, cSegments, cbRead);
985	else
986	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbRead,
987	PDMACTASKFILETRANSFER_READ);
988
989	STAM_PROFILE_ADV_STOP(&pEpFile->StatRead, Read);
990
991	return rc;
992	}
993
994	static int pdmacFileEpWrite(PPDMASYNCCOMPLETIONTASK pTask,
995	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
996	PCRTSGSEG paSegments, size_t cSegments,
997	size_t cbWrite)
998	{
999	int rc = VINF_SUCCESS;
1000	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1001
1002	if (RT_UNLIKELY(pEpFile->fReadonly))
1003	return VERR_NOT_SUPPORTED;
1004
1005	STAM_PROFILE_ADV_START(&pEpFile->StatWrite, Write);
1006
1007	pdmacFileEpTaskInit(pTask, cbWrite);
1008
1009	if (pEpFile->fCaching)
1010	rc = pdmacFileEpCacheWrite(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
1011	off, paSegments, cSegments, cbWrite);
1012	else
1013	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbWrite,
1014	PDMACTASKFILETRANSFER_WRITE);
1015
1016	STAM_PROFILE_ADV_STOP(&pEpFile->StatWrite, Write);
1017
1018	/* Increase endpoint size. */
1019	if ( RT_SUCCESS(rc)
1020	&& ((uint64_t)off + cbWrite) > pEpFile->cbEndpoint)
1021	ASMAtomicWriteU64(&pEpFile->cbEndpoint, (uint64_t)off + cbWrite);
1022
1023	return rc;
1024	}
1025
1026	static int pdmacFileEpFlush(PPDMASYNCCOMPLETIONTASK pTask,
1027	PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
1028	{
1029	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1030	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
1031
1032	if (RT_UNLIKELY(pEpFile->fReadonly))
1033	return VERR_NOT_SUPPORTED;
1034
1035	pdmacFileEpTaskInit(pTask, 0);
1036
1037	if (pEpFile->fCaching)
1038	{
1039	int rc = pdmacFileEpCacheFlush(pEpFile);
1040	AssertRC(rc);
1041	}
1042
1043	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
1044	if (RT_UNLIKELY(!pIoTask))
1045	return VERR_NO_MEMORY;
1046
1047	pIoTask->pEndpoint = pEpFile;
1048	pIoTask->enmTransferType = PDMACTASKFILETRANSFER_FLUSH;
1049	pIoTask->pvUser = pTaskFile;
1050	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
1051	pdmacFileEpAddTask(pEpFile, pIoTask);
1052
1053	return VINF_AIO_TASK_PENDING;
1054	}
1055
1056	static int pdmacFileEpGetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t *pcbSize)
1057	{
1058	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1059
1060	*pcbSize = ASMAtomicReadU64(&pEpFile->cbEndpoint);
1061
1062	return VINF_SUCCESS;
1063	}
1064
1065	static int pdmacFileEpSetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t cbSize)
1066	{
1067	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1068
1069	ASMAtomicWriteU64(&pEpFile->cbEndpoint, cbSize);
1070	return RTFileSetSize(pEpFile->File, cbSize);
1071	}
1072
1073	const PDMASYNCCOMPLETIONEPCLASSOPS g_PDMAsyncCompletionEndpointClassFile =
1074	{
1075	/* u32Version */
1076	PDMAC_EPCLASS_OPS_VERSION,
1077	/* pcszName */
1078	"File",
1079	/* enmClassType */
1080	PDMASYNCCOMPLETIONEPCLASSTYPE_FILE,
1081	/* cbEndpointClassGlobal */
1082	sizeof(PDMASYNCCOMPLETIONEPCLASSFILE),
1083	/* cbEndpoint */
1084	sizeof(PDMASYNCCOMPLETIONENDPOINTFILE),
1085	/* cbTask */
1086	sizeof(PDMASYNCCOMPLETIONTASKFILE),
1087	/* pfnInitialize */
1088	pdmacFileInitialize,
1089	/* pfnTerminate */
1090	pdmacFileTerminate,
1091	/* pfnEpInitialize. */
1092	pdmacFileEpInitialize,
1093	/* pfnEpClose */
1094	pdmacFileEpClose,
1095	/* pfnEpRead */
1096	pdmacFileEpRead,
1097	/* pfnEpWrite */
1098	pdmacFileEpWrite,
1099	/* pfnEpFlush */
1100	pdmacFileEpFlush,
1101	/* pfnEpGetSize */
1102	pdmacFileEpGetSize,
1103	/* pfnEpSetSize */
1104	pdmacFileEpSetSize,
1105	/* u32VersionEnd */
1106	PDMAC_EPCLASS_OPS_VERSION
1107	};
1108

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source: vbox/trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp@ 30060

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