PDMAsyncCompletionFile.cpp@ 34185

Last change on this file since 34185 was 33540, checked in by vboxsync, 14 years ago
*: spelling fixes, thanks Timeless!
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1	/* $Id: PDMAsyncCompletionFile.cpp 33540 2010-10-28 09:27:05Z 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	#ifdef RT_OS_WINDOWS
42	# define _WIN32_WINNT 0x0500
43	# include <windows.h>
44	# include <winioctl.h>
45	#endif
46
47	#include "PDMAsyncCompletionFileInternal.h"
48
49	/**
50	* Frees a task.
51	*
52	* @returns nothing.
53	* @param pEndpoint Pointer to the endpoint the segment was for.
54	* @param pTask The task to free.
55	*/
56	void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
57	PPDMACTASKFILE pTask)
58	{
59	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
60
61	LogFlowFunc((": pEndpoint=%p pTask=%p\n", pEndpoint, pTask));
62
63	/* Try the per endpoint cache first. */
64	if (pEndpoint->cTasksCached < pEpClass->cTasksCacheMax)
65	{
66	/* Add it to the list. */
67	pEndpoint->pTasksFreeTail->pNext = pTask;
68	pEndpoint->pTasksFreeTail = pTask;
69	ASMAtomicIncU32(&pEndpoint->cTasksCached);
70	}
71	else
72	{
73	Log(("Freeing task %p because all caches are full\n", pTask));
74	MMR3HeapFree(pTask);
75	}
76	}
77
78	/**
79	* Allocates a task segment
80	*
81	* @returns Pointer to the new task segment or NULL
82	* @param pEndpoint Pointer to the endpoint
83	*/
84	PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
85	{
86	PPDMACTASKFILE pTask = NULL;
87
88	/* Try the small per endpoint cache first. */
89	if (pEndpoint->pTasksFreeHead == pEndpoint->pTasksFreeTail)
90	{
91	/* Try the bigger endpoint class cache. */
92	PPDMASYNCCOMPLETIONEPCLASSFILE pEndpointClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
93
94	/*
95	* Allocate completely new.
96	* If this fails we return NULL.
97	*/
98	int rc = MMR3HeapAllocZEx(pEndpointClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
99	sizeof(PDMACTASKFILE),
100	(void **)&pTask);
101	if (RT_FAILURE(rc))
102	pTask = NULL;
103
104	LogFlow(("Allocated task %p\n", pTask));
105	}
106	else
107	{
108	/* Grab a free task from the head. */
109	AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contains more than one element\n"));
110
111	pTask = pEndpoint->pTasksFreeHead;
112	pEndpoint->pTasksFreeHead = pTask->pNext;
113	ASMAtomicDecU32(&pEndpoint->cTasksCached);
114	}
115
116	pTask->pNext = NULL;
117
118	return pTask;
119	}
120
121	PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
122	{
123	PPDMACTASKFILE pTasks = NULL;
124
125	/*
126	* Get pending tasks.
127	*/
128	pTasks = ASMAtomicXchgPtrT(&pEndpoint->pTasksNewHead, NULL, PPDMACTASKFILE);
129
130	/* Reverse the list to process in FIFO order. */
131	if (pTasks)
132	{
133	PPDMACTASKFILE pTask = pTasks;
134
135	pTasks = NULL;
136
137	while (pTask)
138	{
139	PPDMACTASKFILE pCur = pTask;
140	pTask = pTask->pNext;
141	pCur->pNext = pTasks;
142	pTasks = pCur;
143	}
144	}
145
146	return pTasks;
147	}
148
149	static void pdmacFileAioMgrWakeup(PPDMACEPFILEMGR pAioMgr)
150	{
151	bool fWokenUp = ASMAtomicXchgBool(&pAioMgr->fWokenUp, true);
152
153	if (!fWokenUp)
154	{
155	int rc = VINF_SUCCESS;
156	bool fWaitingEventSem = ASMAtomicReadBool(&pAioMgr->fWaitingEventSem);
157
158	if (fWaitingEventSem)
159	rc = RTSemEventSignal(pAioMgr->EventSem);
160
161	AssertRC(rc);
162	}
163	}
164
165	static int pdmacFileAioMgrWaitForBlockingEvent(PPDMACEPFILEMGR pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT enmEvent)
166	{
167	int rc = VINF_SUCCESS;
168
169	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, enmEvent);
170	Assert(!pAioMgr->fBlockingEventPending);
171	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, true);
172
173	/* Wakeup the async I/O manager */
174	pdmacFileAioMgrWakeup(pAioMgr);
175
176	/* Wait for completion. */
177	rc = RTSemEventWait(pAioMgr->EventSemBlock, RT_INDEFINITE_WAIT);
178	AssertRC(rc);
179
180	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, false);
181	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID);
182
183	return rc;
184	}
185
186	int pdmacFileAioMgrAddEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
187	{
188	int rc;
189
190	LogFlowFunc(("pAioMgr=%#p pEndpoint=%#p{%s}\n", pAioMgr, pEndpoint, pEndpoint->Core.pszUri));
191
192	/* Update the assigned I/O manager. */
193	ASMAtomicWritePtr(&pEndpoint->pAioMgr, pAioMgr);
194
195	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
196	AssertRCReturn(rc, rc);
197
198	ASMAtomicWritePtr(&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint, pEndpoint);
199	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT);
200	ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint);
201
202	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
203
204	return rc;
205	}
206
207	static int pdmacFileAioMgrRemoveEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
208	{
209	int rc;
210
211	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
212	AssertRCReturn(rc, rc);
213
214	ASMAtomicWritePtr(&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint, pEndpoint);
215	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT);
216	ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint);
217
218	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
219
220	return rc;
221	}
222
223	static int pdmacFileAioMgrCloseEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
224	{
225	int rc;
226
227	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
228	AssertRCReturn(rc, rc);
229
230	ASMAtomicWritePtr(&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint, pEndpoint);
231	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT);
232	ASMAtomicWriteNullPtr(&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint);
233
234	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
235
236	return rc;
237	}
238
239	static int pdmacFileAioMgrShutdown(PPDMACEPFILEMGR pAioMgr)
240	{
241	int rc;
242
243	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
244	AssertRCReturn(rc, rc);
245
246	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN);
247
248	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
249
250	return rc;
251	}
252
253	int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask)
254	{
255	PPDMACTASKFILE pNext;
256	do
257	{
258	pNext = pEndpoint->pTasksNewHead;
259	pTask->pNext = pNext;
260	} while (!ASMAtomicCmpXchgPtr(&pEndpoint->pTasksNewHead, pTask, pNext));
261
262	pdmacFileAioMgrWakeup(ASMAtomicReadPtrT(&pEndpoint->pAioMgr, PPDMACEPFILEMGR));
263
264	return VINF_SUCCESS;
265	}
266
267	void pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser, int rc)
268	{
269	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pvUser;
270
271	LogFlowFunc(("pTask=%#p pvUser=%#p rc=%Rrc\n", pTask, pvUser, rc));
272
273	if (pTask->enmTransferType == PDMACTASKFILETRANSFER_FLUSH)
274	{
275	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, rc, true);
276	}
277	else
278	{
279	Assert((uint32_t)pTask->DataSeg.cbSeg == pTask->DataSeg.cbSeg && (int32_t)pTask->DataSeg.cbSeg >= 0);
280	uint32_t uOld = ASMAtomicSubS32(&pTaskFile->cbTransferLeft, (int32_t)pTask->DataSeg.cbSeg);
281
282	/* The first error will be returned. */
283	if (RT_FAILURE(rc))
284	ASMAtomicCmpXchgS32(&pTaskFile->rc, rc, VINF_SUCCESS);
285
286	if (!(uOld - pTask->DataSeg.cbSeg)
287	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
288	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, pTaskFile->rc, true);
289	}
290	}
291
292	DECLINLINE(void) pdmacFileEpTaskInit(PPDMASYNCCOMPLETIONTASK pTask, size_t cbTransfer)
293	{
294	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
295
296	Assert((uint32_t)cbTransfer == cbTransfer && (int32_t)cbTransfer >= 0);
297	ASMAtomicWriteS32(&pTaskFile->cbTransferLeft, (int32_t)cbTransfer);
298	ASMAtomicWriteBool(&pTaskFile->fCompleted, false);
299	ASMAtomicWriteS32(&pTaskFile->rc, VINF_SUCCESS);
300	}
301
302	int pdmacFileEpTaskInitiate(PPDMASYNCCOMPLETIONTASK pTask,
303	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
304	PCRTSGSEG paSegments, size_t cSegments,
305	size_t cbTransfer, PDMACTASKFILETRANSFER enmTransfer)
306	{
307	int rc = VINF_SUCCESS;
308	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
309	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
310	PPDMACEPFILEMGR pAioMgr = pEpFile->pAioMgr;
311
312	Assert( (enmTransfer == PDMACTASKFILETRANSFER_READ)
313	\|\| (enmTransfer == PDMACTASKFILETRANSFER_WRITE));
314
315	for (unsigned i = 0; i < cSegments; i++)
316	{
317	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
318	AssertPtr(pIoTask);
319
320	pIoTask->pEndpoint = pEpFile;
321	pIoTask->enmTransferType = enmTransfer;
322	pIoTask->Off = off;
323	pIoTask->DataSeg.cbSeg = paSegments[i].cbSeg;
324	pIoTask->DataSeg.pvSeg = paSegments[i].pvSeg;
325	pIoTask->pvUser = pTaskFile;
326	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
327
328	/* Send it off to the I/O manager. */
329	pdmacFileEpAddTask(pEpFile, pIoTask);
330	off += paSegments[i].cbSeg;
331	cbTransfer -= paSegments[i].cbSeg;
332	}
333
334	AssertMsg(!cbTransfer, ("Incomplete transfer %u bytes left\n", cbTransfer));
335
336	if (ASMAtomicReadS32(&pTaskFile->cbTransferLeft) == 0
337	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
338	pdmR3AsyncCompletionCompleteTask(pTask, pTaskFile->rc, false);
339	else
340	rc = VINF_AIO_TASK_PENDING;
341
342	return rc;
343	}
344
345	/**
346	* Creates a new async I/O manager.
347	*
348	* @returns VBox status code.
349	* @param pEpClass Pointer to the endpoint class data.
350	* @param ppAioMgr Where to store the pointer to the new async I/O manager on success.
351	* @param enmMgrType Wanted manager type - can be overwritten by the global override.
352	*/
353	int pdmacFileAioMgrCreate(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass, PPPDMACEPFILEMGR ppAioMgr,
354	PDMACEPFILEMGRTYPE enmMgrType)
355	{
356	int rc = VINF_SUCCESS;
357	PPDMACEPFILEMGR pAioMgrNew;
358
359	LogFlowFunc((": Entered\n"));
360
361	rc = MMR3HeapAllocZEx(pEpClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, sizeof(PDMACEPFILEMGR), (void **)&pAioMgrNew);
362	if (RT_SUCCESS(rc))
363	{
364	if (enmMgrType < pEpClass->enmMgrTypeOverride)
365	pAioMgrNew->enmMgrType = enmMgrType;
366	else
367	pAioMgrNew->enmMgrType = pEpClass->enmMgrTypeOverride;
368
369	rc = RTSemEventCreate(&pAioMgrNew->EventSem);
370	if (RT_SUCCESS(rc))
371	{
372	rc = RTSemEventCreate(&pAioMgrNew->EventSemBlock);
373	if (RT_SUCCESS(rc))
374	{
375	rc = RTCritSectInit(&pAioMgrNew->CritSectBlockingEvent);
376	if (RT_SUCCESS(rc))
377	{
378	/* Init the rest of the manager. */
379	if (pAioMgrNew->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
380	rc = pdmacFileAioMgrNormalInit(pAioMgrNew);
381
382	if (RT_SUCCESS(rc))
383	{
384	pAioMgrNew->enmState = PDMACEPFILEMGRSTATE_RUNNING;
385
386	rc = RTThreadCreateF(&pAioMgrNew->Thread,
387	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
388	? pdmacFileAioMgrFailsafe
389	: pdmacFileAioMgrNormal,
390	pAioMgrNew,
391	0,
392	RTTHREADTYPE_IO,
393	0,
394	"AioMgr%d-%s", pEpClass->cAioMgrs,
395	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
396	? "F"
397	: "N");
398	if (RT_SUCCESS(rc))
399	{
400	/* Link it into the list. */
401	RTCritSectEnter(&pEpClass->CritSect);
402	pAioMgrNew->pNext = pEpClass->pAioMgrHead;
403	if (pEpClass->pAioMgrHead)
404	pEpClass->pAioMgrHead->pPrev = pAioMgrNew;
405	pEpClass->pAioMgrHead = pAioMgrNew;
406	pEpClass->cAioMgrs++;
407	RTCritSectLeave(&pEpClass->CritSect);
408
409	*ppAioMgr = pAioMgrNew;
410
411	Log(("PDMAC: Successfully created new file AIO Mgr {%s}\n", RTThreadGetName(pAioMgrNew->Thread)));
412	return VINF_SUCCESS;
413	}
414	pdmacFileAioMgrNormalDestroy(pAioMgrNew);
415	}
416	RTCritSectDelete(&pAioMgrNew->CritSectBlockingEvent);
417	}
418	RTSemEventDestroy(pAioMgrNew->EventSem);
419	}
420	RTSemEventDestroy(pAioMgrNew->EventSemBlock);
421	}
422	MMR3HeapFree(pAioMgrNew);
423	}
424
425	LogFlowFunc((": Leave rc=%Rrc\n", rc));
426
427	return rc;
428	}
429
430	/**
431	* Destroys a async I/O manager.
432	*
433	* @returns nothing.
434	* @param pAioMgr The async I/O manager to destroy.
435	*/
436	static void pdmacFileAioMgrDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile, PPDMACEPFILEMGR pAioMgr)
437	{
438	int rc = pdmacFileAioMgrShutdown(pAioMgr);
439	AssertRC(rc);
440
441	/* Unlink from the list. */
442	rc = RTCritSectEnter(&pEpClassFile->CritSect);
443	AssertRC(rc);
444
445	PPDMACEPFILEMGR pPrev = pAioMgr->pPrev;
446	PPDMACEPFILEMGR pNext = pAioMgr->pNext;
447
448	if (pPrev)
449	pPrev->pNext = pNext;
450	else
451	pEpClassFile->pAioMgrHead = pNext;
452
453	if (pNext)
454	pNext->pPrev = pPrev;
455
456	pEpClassFile->cAioMgrs--;
457	rc = RTCritSectLeave(&pEpClassFile->CritSect);
458	AssertRC(rc);
459
460	/* Free the resources. */
461	RTCritSectDelete(&pAioMgr->CritSectBlockingEvent);
462	RTSemEventDestroy(pAioMgr->EventSem);
463	if (pAioMgr->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
464	pdmacFileAioMgrNormalDestroy(pAioMgr);
465
466	MMR3HeapFree(pAioMgr);
467	}
468
469	static int pdmacFileMgrTypeFromName(const char *pszVal, PPDMACEPFILEMGRTYPE penmMgrType)
470	{
471	int rc = VINF_SUCCESS;
472
473	if (!RTStrCmp(pszVal, "Simple"))
474	*penmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
475	else if (!RTStrCmp(pszVal, "Async"))
476	*penmMgrType = PDMACEPFILEMGRTYPE_ASYNC;
477	else
478	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
479
480	return rc;
481	}
482
483	static const char *pdmacFileMgrTypeToName(PDMACEPFILEMGRTYPE enmMgrType)
484	{
485	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
486	return "Simple";
487	if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC)
488	return "Async";
489
490	return NULL;
491	}
492
493	static int pdmacFileBackendTypeFromName(const char *pszVal, PPDMACFILEEPBACKEND penmBackendType)
494	{
495	int rc = VINF_SUCCESS;
496
497	if (!RTStrCmp(pszVal, "Buffered"))
498	*penmBackendType = PDMACFILEEPBACKEND_BUFFERED;
499	else if (!RTStrCmp(pszVal, "NonBuffered"))
500	*penmBackendType = PDMACFILEEPBACKEND_NON_BUFFERED;
501	else
502	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
503
504	return rc;
505	}
506
507	static const char *pdmacFileBackendTypeToName(PDMACFILEEPBACKEND enmBackendType)
508	{
509	if (enmBackendType == PDMACFILEEPBACKEND_BUFFERED)
510	return "Buffered";
511	if (enmBackendType == PDMACFILEEPBACKEND_NON_BUFFERED)
512	return "NonBuffered";
513
514	return NULL;
515	}
516
517	/**
518	* Get the size of the given file.
519	* Works for block devices too.
520	*
521	* @returns VBox status code.
522	* @param hFile The file handle.
523	* @param pcbSize Where to store the size of the file on success.
524	*/
525	static int pdmacFileEpNativeGetSize(RTFILE hFile, uint64_t *pcbSize)
526	{
527	int rc = VINF_SUCCESS;
528	uint64_t cbSize = 0;
529
530	rc = RTFileGetSize(hFile, &cbSize);
531	if (RT_SUCCESS(rc) && (cbSize != 0))
532	*pcbSize = cbSize;
533	else
534	{
535	#ifdef RT_OS_WINDOWS
536	DISK_GEOMETRY DriveGeo;
537	DWORD cbDriveGeo;
538	if (DeviceIoControl((HANDLE)hFile,
539	IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
540	&DriveGeo, sizeof(DriveGeo), &cbDriveGeo, NULL))
541	{
542	if ( DriveGeo.MediaType == FixedMedia
543	\|\| DriveGeo.MediaType == RemovableMedia)
544	{
545	cbSize = DriveGeo.Cylinders.QuadPart
546	* DriveGeo.TracksPerCylinder
547	* DriveGeo.SectorsPerTrack
548	* DriveGeo.BytesPerSector;
549
550	GET_LENGTH_INFORMATION DiskLenInfo;
551	DWORD junk;
552	if (DeviceIoControl((HANDLE)hFile,
553	IOCTL_DISK_GET_LENGTH_INFO, NULL, 0,
554	&DiskLenInfo, sizeof(DiskLenInfo), &junk, (LPOVERLAPPED)NULL))
555	{
556	/* IOCTL_DISK_GET_LENGTH_INFO is supported -- override cbSize. */
557	cbSize = DiskLenInfo.Length.QuadPart;
558	}
559
560	rc = VINF_SUCCESS;
561	}
562	else
563	{
564	rc = VERR_INVALID_PARAMETER;
565	}
566	}
567	else
568	{
569	rc = RTErrConvertFromWin32(GetLastError());
570	}
571	#else
572	/* Could be a block device */
573	rc = RTFileSeek(hFile, 0, RTFILE_SEEK_END, &cbSize);
574
575	#endif
576	if (RT_SUCCESS(rc) && (cbSize != 0))
577	*pcbSize = cbSize;
578	else if (RT_SUCCESS(rc))
579	rc = VERR_NOT_SUPPORTED;
580	}
581
582	return rc;
583	}
584
585	static int pdmacFileInitialize(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals, PCFGMNODE pCfgNode)
586	{
587	int rc = VINF_SUCCESS;
588	RTFILEAIOLIMITS AioLimits; /** < Async I/O limitations. */
589
590	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
591
592	rc = RTFileAioGetLimits(&AioLimits);
593	#ifdef DEBUG
594	if (RT_SUCCESS(rc) && RTEnvExist("VBOX_ASYNC_IO_FAILBACK"))
595	rc = VERR_ENV_VAR_NOT_FOUND;
596	#endif
597	if (RT_FAILURE(rc))
598	{
599	LogRel(("AIO: Async I/O manager not supported (rc=%Rrc). Falling back to simple manager\n",
600	rc));
601	pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_SIMPLE;
602	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_BUFFERED;
603	}
604	else
605	{
606	pEpClassFile->uBitmaskAlignment = AioLimits.cbBufferAlignment ? ~((RTR3UINTPTR)AioLimits.cbBufferAlignment - 1) : RTR3UINTPTR_MAX;
607	pEpClassFile->cReqsOutstandingMax = AioLimits.cReqsOutstandingMax;
608
609	if (pCfgNode)
610	{
611	/* Query the default manager type */
612	char *pszVal = NULL;
613	rc = CFGMR3QueryStringAllocDef(pCfgNode, "IoMgr", &pszVal, "Async");
614	AssertLogRelRCReturn(rc, rc);
615
616	rc = pdmacFileMgrTypeFromName(pszVal, &pEpClassFile->enmMgrTypeOverride);
617	MMR3HeapFree(pszVal);
618	if (RT_FAILURE(rc))
619	return rc;
620
621	LogRel(("AIOMgr: Default manager type is \"%s\"\n", pdmacFileMgrTypeToName(pEpClassFile->enmMgrTypeOverride)));
622
623	/* Query default backend type */
624	rc = CFGMR3QueryStringAllocDef(pCfgNode, "FileBackend", &pszVal, "NonBuffered");
625	AssertLogRelRCReturn(rc, rc);
626
627	rc = pdmacFileBackendTypeFromName(pszVal, &pEpClassFile->enmEpBackendDefault);
628	MMR3HeapFree(pszVal);
629	if (RT_FAILURE(rc))
630	return rc;
631
632	LogRel(("AIOMgr: Default file backend is \"%s\"\n", pdmacFileBackendTypeToName(pEpClassFile->enmEpBackendDefault)));
633
634	#ifdef RT_OS_LINUX
635	if ( pEpClassFile->enmMgrTypeOverride == PDMACEPFILEMGRTYPE_ASYNC
636	&& pEpClassFile->enmEpBackendDefault == PDMACFILEEPBACKEND_BUFFERED)
637	{
638	LogRel(("AIOMgr: Linux does not support buffered async I/O, changing to non buffered\n"));
639	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
640	}
641	#endif
642	}
643	else
644	{
645	/* No configuration supplied, set defaults */
646	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
647	pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_ASYNC;
648	}
649	}
650
651	/* Init critical section. */
652	rc = RTCritSectInit(&pEpClassFile->CritSect);
653	if (RT_SUCCESS(rc))
654	{
655	/* Check if the cache was disabled by the user. */
656	rc = CFGMR3QueryBoolDef(pCfgNode, "CacheEnabled", &pEpClassFile->fCacheEnabled, true);
657	AssertLogRelRCReturn(rc, rc);
658
659	if (pEpClassFile->fCacheEnabled)
660	{
661	/* Init cache structure */
662	rc = pdmacFileCacheInit(pEpClassFile, pCfgNode);
663	if (RT_FAILURE(rc))
664	{
665	pEpClassFile->fCacheEnabled = false;
666	LogRel(("AIOMgr: Failed to initialise the cache (rc=%Rrc), disabled caching\n"));
667	}
668	}
669	else
670	LogRel(("AIOMgr: Cache was globally disabled\n"));
671	}
672
673	return rc;
674	}
675
676	static void pdmacFileTerminate(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals)
677	{
678	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
679
680	/* All endpoints should be closed at this point. */
681	AssertMsg(!pEpClassFile->Core.pEndpointsHead, ("There are still endpoints left\n"));
682
683	/* Destroy all left async I/O managers. */
684	while (pEpClassFile->pAioMgrHead)
685	pdmacFileAioMgrDestroy(pEpClassFile, pEpClassFile->pAioMgrHead);
686
687	/* Destroy the cache. */
688	if (pEpClassFile->fCacheEnabled)
689	pdmacFileCacheDestroy(pEpClassFile);
690
691	RTCritSectDelete(&pEpClassFile->CritSect);
692	}
693
694	static int pdmacFileEpInitialize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint,
695	const char *pszUri, uint32_t fFlags)
696	{
697	int rc = VINF_SUCCESS;
698	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
699	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
700	PDMACEPFILEMGRTYPE enmMgrType = pEpClassFile->enmMgrTypeOverride;
701	PDMACFILEEPBACKEND enmEpBackend = pEpClassFile->enmEpBackendDefault;
702
703	AssertMsgReturn((fFlags & ~(PDMACEP_FILE_FLAGS_READ_ONLY \| PDMACEP_FILE_FLAGS_CACHING \| PDMACEP_FILE_FLAGS_DONT_LOCK)) == 0,
704	("PDMAsyncCompletion: Invalid flag specified\n"), VERR_INVALID_PARAMETER);
705
706	unsigned fFileFlags = RTFILE_O_OPEN;
707
708	if (fFlags & PDMACEP_FILE_FLAGS_READ_ONLY)
709	fFileFlags \|= RTFILE_O_READ \| RTFILE_O_DENY_NONE;
710	else
711	{
712	fFileFlags \|= RTFILE_O_READWRITE;
713
714	/*
715	* Opened in read/write mode. Check whether the caller wants to
716	* avoid the lock. Return an error in case caching is enabled
717	* because this can lead to data corruption.
718	*/
719	if (fFlags & PDMACEP_FILE_FLAGS_DONT_LOCK)
720	{
721	if (fFlags & PDMACEP_FILE_FLAGS_CACHING)
722	return VERR_NOT_SUPPORTED;
723	else
724	fFileFlags \|= RTFILE_O_DENY_NONE;
725	}
726	else
727	fFileFlags \|= RTFILE_O_DENY_WRITE;
728	}
729
730	if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC)
731	fFileFlags \|= RTFILE_O_ASYNC_IO;
732
733	if (enmEpBackend == PDMACFILEEPBACKEND_NON_BUFFERED)
734	{
735	/*
736	* We only disable the cache if the size of the file is a multiple of 512.
737	* Certain hosts like Windows, Linux and Solaris require that transfer sizes
738	* are aligned to the volume sector size.
739	* If not we just make sure that the data is written to disk with RTFILE_O_WRITE_THROUGH
740	* which will trash the host cache but ensures that the host cache will not
741	* contain dirty buffers.
742	*/
743	RTFILE File = NIL_RTFILE;
744
745	rc = RTFileOpen(&File, pszUri, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
746	if (RT_SUCCESS(rc))
747	{
748	uint64_t cbSize;
749
750	rc = pdmacFileEpNativeGetSize(File, &cbSize);
751	Assert(RT_FAILURE(rc) \|\| cbSize != 0);
752
753	if (RT_SUCCESS(rc) && ((cbSize % 512) == 0))
754	fFileFlags \|= RTFILE_O_NO_CACHE;
755	else
756	{
757	/* Downgrade to the buffered backend */
758	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
759
760	#ifdef RT_OS_LINUX
761	fFileFlags &= ~RTFILE_O_ASYNC_IO;
762	enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
763	#endif
764	}
765	RTFileClose(File);
766	}
767	}
768
769	/* Open with final flags. */
770	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
771	if ((rc == VERR_INVALID_FUNCTION) \|\| (rc == VERR_INVALID_PARAMETER))
772	{
773	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed with %Rrc\n",
774	pszUri, fFileFlags, rc));
775	/*
776	* Solaris doesn't support directio on ZFS so far. :-\
777	* Trying to enable it returns VERR_INVALID_FUNCTION
778	* (ENOTTY). Remove it and hope for the best.
779	* ZFS supports write throttling in case applications
780	* write more data than can be synced to the disk
781	* without blocking the whole application.
782	*
783	* On Linux we have the same problem with cifs.
784	* Have to disable async I/O here too because it requires O_DIRECT.
785	*/
786	fFileFlags &= ~RTFILE_O_NO_CACHE;
787	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
788
789	#ifdef RT_OS_LINUX
790	fFileFlags &= ~RTFILE_O_ASYNC_IO;
791	enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
792	#endif
793
794	/* Open again. */
795	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
796
797	if (RT_FAILURE(rc))
798	{
799	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed AGAIN(!) with %Rrc\n",
800	pszUri, fFileFlags, rc));
801	}
802	}
803
804	if (RT_SUCCESS(rc))
805	{
806	pEpFile->fFlags = fFileFlags;
807
808	rc = pdmacFileEpNativeGetSize(pEpFile->File, (uint64_t *)&pEpFile->cbFile);
809	Assert(RT_FAILURE(rc) \|\| pEpFile->cbFile != 0);
810
811	if (RT_SUCCESS(rc))
812	{
813	/* Initialize the segment cache */
814	rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
815	sizeof(PDMACTASKFILE),
816	(void **)&pEpFile->pTasksFreeHead);
817	if (RT_SUCCESS(rc))
818	{
819	PPDMACEPFILEMGR pAioMgr = NULL;
820
821	pEpFile->cbEndpoint = pEpFile->cbFile;
822	pEpFile->pTasksFreeTail = pEpFile->pTasksFreeHead;
823	pEpFile->cTasksCached = 0;
824	pEpFile->enmBackendType = enmEpBackend;
825	/*
826	* Disable async flushes on Solaris for now.
827	* They cause weird hangs which needs more investigations.
828	*/
829	#ifndef RT_OS_SOLARIS
830	pEpFile->fAsyncFlushSupported = true;
831	#else
832	pEpFile->fAsyncFlushSupported = false;
833	#endif
834
835	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
836	{
837	/* Simple mode. Every file has its own async I/O manager. */
838	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, PDMACEPFILEMGRTYPE_SIMPLE);
839	AssertRC(rc);
840	}
841	else
842	{
843	if ( (fFlags & PDMACEP_FILE_FLAGS_CACHING)
844	&& (pEpClassFile->fCacheEnabled))
845	{
846	pEpFile->fCaching = true;
847	rc = pdmacFileEpCacheInit(pEpFile, pEpClassFile);
848	if (RT_FAILURE(rc))
849	{
850	LogRel(("AIOMgr: Endpoint for \"%s\" was opened with caching but initializing cache failed. Disabled caching\n", pszUri));
851	pEpFile->fCaching = false;
852	}
853	}
854
855	pAioMgr = pEpClassFile->pAioMgrHead;
856
857	/* Check for an idling manager of the same type */
858	while (pAioMgr)
859	{
860	if (pAioMgr->enmMgrType == enmMgrType)
861	break;
862	pAioMgr = pAioMgr->pNext;
863	}
864
865	if (!pAioMgr)
866	{
867	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, enmMgrType);
868	AssertRC(rc);
869	}
870	}
871
872	pEpFile->AioMgr.pTreeRangesLocked = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE));
873	if (!pEpFile->AioMgr.pTreeRangesLocked)
874	rc = VERR_NO_MEMORY;
875	else
876	{
877	pEpFile->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE;
878
879	/* Assign the endpoint to the thread. */
880	rc = pdmacFileAioMgrAddEndpoint(pAioMgr, pEpFile);
881	if (RT_FAILURE(rc))
882	{
883	RTMemFree(pEpFile->AioMgr.pTreeRangesLocked);
884	MMR3HeapFree(pEpFile->pTasksFreeHead);
885	}
886	}
887	}
888	}
889
890	if (RT_FAILURE(rc))
891	RTFileClose(pEpFile->File);
892	}
893
894	#ifdef VBOX_WITH_STATISTICS
895	if (RT_SUCCESS(rc))
896	{
897	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatRead,
898	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
899	STAMUNIT_TICKS_PER_CALL, "Time taken to read from the endpoint",
900	"/PDM/AsyncCompletion/File/%s/Read", RTPathFilename(pEpFile->Core.pszUri));
901
902	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatWrite,
903	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
904	STAMUNIT_TICKS_PER_CALL, "Time taken to write to the endpoint",
905	"/PDM/AsyncCompletion/File/%s/Write", RTPathFilename(pEpFile->Core.pszUri));
906	}
907	#endif
908
909	if (RT_SUCCESS(rc))
910	LogRel(("AIOMgr: Endpoint for file '%s' (flags %08x) created successfully\n", pszUri, pEpFile->fFlags));
911
912	return rc;
913	}
914
915	static int pdmacFileEpRangesLockedDestroy(PAVLRFOFFNODECORE pNode, void *pvUser)
916	{
917	AssertMsgFailed(("The locked ranges tree should be empty at that point\n"));
918	return VINF_SUCCESS;
919	}
920
921	static int pdmacFileEpClose(PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
922	{
923	int rc = VINF_SUCCESS;
924	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
925	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
926
927	/* Free the cached data. */
928	if (pEpFile->fCaching)
929	{
930	rc = pdmacFileEpCacheFlush(pEpFile);
931	AssertRC(rc);
932	}
933
934	/* Make sure that all tasks finished for this endpoint. */
935	rc = pdmacFileAioMgrCloseEndpoint(pEpFile->pAioMgr, pEpFile);
936	AssertRC(rc);
937
938	/* endpoint and real file size should better be equal now. */
939	AssertMsg(pEpFile->cbFile == pEpFile->cbEndpoint,
940	("Endpoint and real file size should match now!\n"));
941
942	/* Destroy any per endpoint cache data */
943	if (pEpFile->fCaching)
944	pdmacFileEpCacheDestroy(pEpFile);
945
946	/*
947	* If the async I/O manager is in failsafe mode this is the only endpoint
948	* he processes and thus can be destroyed now.
949	*/
950	if (pEpFile->pAioMgr->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
951	pdmacFileAioMgrDestroy(pEpClassFile, pEpFile->pAioMgr);
952
953	/* Free cached tasks. */
954	PPDMACTASKFILE pTask = pEpFile->pTasksFreeHead;
955
956	while (pTask)
957	{
958	PPDMACTASKFILE pTaskFree = pTask;
959	pTask = pTask->pNext;
960	MMR3HeapFree(pTaskFree);
961	}
962
963	/* Destroy the locked ranges tree now. */
964	RTAvlrFileOffsetDestroy(pEpFile->AioMgr.pTreeRangesLocked, pdmacFileEpRangesLockedDestroy, NULL);
965
966	RTFileClose(pEpFile->File);
967
968	#ifdef VBOX_WITH_STATISTICS
969	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatRead);
970	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatWrite);
971	#endif
972
973	return VINF_SUCCESS;
974	}
975
976	static int pdmacFileEpRead(PPDMASYNCCOMPLETIONTASK pTask,
977	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
978	PCRTSGSEG paSegments, size_t cSegments,
979	size_t cbRead)
980	{
981	int rc = VINF_SUCCESS;
982	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
983
984	LogFlowFunc(("pTask=%#p pEndpoint=%#p off=%RTfoff paSegments=%#p cSegments=%zu cbRead=%zu\n",
985	pTask, pEndpoint, off, paSegments, cSegments, cbRead));
986
987	STAM_PROFILE_ADV_START(&pEpFile->StatRead, Read);
988
989	pdmacFileEpTaskInit(pTask, cbRead);
990
991	if (pEpFile->fCaching)
992	rc = pdmacFileEpCacheRead(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
993	off, paSegments, cSegments, cbRead);
994	else
995	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbRead,
996	PDMACTASKFILETRANSFER_READ);
997
998	STAM_PROFILE_ADV_STOP(&pEpFile->StatRead, Read);
999
1000	return rc;
1001	}
1002
1003	static int pdmacFileEpWrite(PPDMASYNCCOMPLETIONTASK pTask,
1004	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
1005	PCRTSGSEG paSegments, size_t cSegments,
1006	size_t cbWrite)
1007	{
1008	int rc = VINF_SUCCESS;
1009	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1010
1011	if (RT_UNLIKELY(pEpFile->fReadonly))
1012	return VERR_NOT_SUPPORTED;
1013
1014	STAM_PROFILE_ADV_START(&pEpFile->StatWrite, Write);
1015
1016	pdmacFileEpTaskInit(pTask, cbWrite);
1017
1018	if (pEpFile->fCaching)
1019	rc = pdmacFileEpCacheWrite(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
1020	off, paSegments, cSegments, cbWrite);
1021	else
1022	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbWrite,
1023	PDMACTASKFILETRANSFER_WRITE);
1024
1025	STAM_PROFILE_ADV_STOP(&pEpFile->StatWrite, Write);
1026
1027	/* Increase endpoint size. */
1028	if ( RT_SUCCESS(rc)
1029	&& ((uint64_t)off + cbWrite) > pEpFile->cbEndpoint)
1030	ASMAtomicWriteU64(&pEpFile->cbEndpoint, (uint64_t)off + cbWrite);
1031
1032	return rc;
1033	}
1034
1035	static int pdmacFileEpFlush(PPDMASYNCCOMPLETIONTASK pTask,
1036	PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
1037	{
1038	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1039	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
1040
1041	if (RT_UNLIKELY(pEpFile->fReadonly))
1042	return VERR_NOT_SUPPORTED;
1043
1044	pdmacFileEpTaskInit(pTask, 0);
1045
1046	if (pEpFile->fCaching)
1047	{
1048	int rc = pdmacFileEpCacheFlush(pEpFile);
1049	AssertRC(rc);
1050	}
1051
1052	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
1053	if (RT_UNLIKELY(!pIoTask))
1054	return VERR_NO_MEMORY;
1055
1056	pIoTask->pEndpoint = pEpFile;
1057	pIoTask->enmTransferType = PDMACTASKFILETRANSFER_FLUSH;
1058	pIoTask->pvUser = pTaskFile;
1059	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
1060	pdmacFileEpAddTask(pEpFile, pIoTask);
1061
1062	return VINF_AIO_TASK_PENDING;
1063	}
1064
1065	static int pdmacFileEpGetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t *pcbSize)
1066	{
1067	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1068
1069	*pcbSize = ASMAtomicReadU64(&pEpFile->cbEndpoint);
1070
1071	return VINF_SUCCESS;
1072	}
1073
1074	static int pdmacFileEpSetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t cbSize)
1075	{
1076	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1077
1078	ASMAtomicWriteU64(&pEpFile->cbEndpoint, cbSize);
1079	return RTFileSetSize(pEpFile->File, cbSize);
1080	}
1081
1082	const PDMASYNCCOMPLETIONEPCLASSOPS g_PDMAsyncCompletionEndpointClassFile =
1083	{
1084	/* u32Version */
1085	PDMAC_EPCLASS_OPS_VERSION,
1086	/* pcszName */
1087	"File",
1088	/* enmClassType */
1089	PDMASYNCCOMPLETIONEPCLASSTYPE_FILE,
1090	/* cbEndpointClassGlobal */
1091	sizeof(PDMASYNCCOMPLETIONEPCLASSFILE),
1092	/* cbEndpoint */
1093	sizeof(PDMASYNCCOMPLETIONENDPOINTFILE),
1094	/* cbTask */
1095	sizeof(PDMASYNCCOMPLETIONTASKFILE),
1096	/* pfnInitialize */
1097	pdmacFileInitialize,
1098	/* pfnTerminate */
1099	pdmacFileTerminate,
1100	/* pfnEpInitialize. */
1101	pdmacFileEpInitialize,
1102	/* pfnEpClose */
1103	pdmacFileEpClose,
1104	/* pfnEpRead */
1105	pdmacFileEpRead,
1106	/* pfnEpWrite */
1107	pdmacFileEpWrite,
1108	/* pfnEpFlush */
1109	pdmacFileEpFlush,
1110	/* pfnEpGetSize */
1111	pdmacFileEpGetSize,
1112	/* pfnEpSetSize */
1113	pdmacFileEpSetSize,
1114	/* u32VersionEnd */
1115	PDMAC_EPCLASS_OPS_VERSION
1116	};
1117

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source: vbox/trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp@ 34185

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