PDMAsyncCompletionFile.cpp@ 27476

Last change on this file since 27476 was 27474, checked in by vboxsync, 15 years ago
AsyncCompletion: Release log entry for every opened endpoint
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1	/* $Id: PDMAsyncCompletionFile.cpp 27474 2010-03-18 11:01:13Z vboxsync $ */
2	/** @file
3	* PDM Async I/O - Transport data asynchronous in R3 using EMT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2009 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_PDM_ASYNC_COMPLETION
27	//#define DEBUG
28	#include "PDMInternal.h"
29	#include <VBox/pdm.h>
30	#include <VBox/mm.h>
31	#include <VBox/vm.h>
32	#include <VBox/err.h>
33	#include <VBox/log.h>
34
35	#include <iprt/asm.h>
36	#include <iprt/assert.h>
37	#include <iprt/critsect.h>
38	#include <iprt/env.h>
39	#include <iprt/file.h>
40	#include <iprt/mem.h>
41	#include <iprt/semaphore.h>
42	#include <iprt/string.h>
43	#include <iprt/thread.h>
44	#include <iprt/path.h>
45
46	#include "PDMAsyncCompletionFileInternal.h"
47
48	/**
49	* Frees a task.
50	*
51	* @returns nothing.
52	* @param pEndpoint Pointer to the endpoint the segment was for.
53	* @param pTask The task to free.
54	*/
55	void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
56	PPDMACTASKFILE pTask)
57	{
58	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
59
60	LogFlowFunc((": pEndpoint=%p pTask=%p\n", pEndpoint, pTask));
61
62	/* Try the per endpoint cache first. */
63	if (pEndpoint->cTasksCached < pEpClass->cTasksCacheMax)
64	{
65	/* Add it to the list. */
66	pEndpoint->pTasksFreeTail->pNext = pTask;
67	pEndpoint->pTasksFreeTail = pTask;
68	ASMAtomicIncU32(&pEndpoint->cTasksCached);
69	}
70	else if (false)
71	{
72	/* Bigger class cache */
73	}
74	else
75	{
76	Log(("Freeing task %p because all caches are full\n", pTask));
77	MMR3HeapFree(pTask);
78	}
79	}
80
81	/**
82	* Allocates a task segment
83	*
84	* @returns Pointer to the new task segment or NULL
85	* @param pEndpoint Pointer to the endpoint
86	*/
87	PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
88	{
89	PPDMACTASKFILE pTask = NULL;
90
91	/* Try the small per endpoint cache first. */
92	if (pEndpoint->pTasksFreeHead == pEndpoint->pTasksFreeTail)
93	{
94	/* Try the bigger endpoint class cache. */
95	PPDMASYNCCOMPLETIONEPCLASSFILE pEndpointClass = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->Core.pEpClass;
96
97	#if 0
98	/* We start with the assigned slot id to distribute the load when allocating new tasks. */
99	unsigned iSlot = pEndpoint->iSlotStart;
100	do
101	{
102	pTask = (PPDMASYNCCOMPLETIONTASK)ASMAtomicXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], NULL);
103	if (pTask)
104	break;
105
106	iSlot = (iSlot + 1) % RT_ELEMENTS(pEndpointClass->apTaskCache);
107	} while (iSlot != pEndpoint->iSlotStart);
108	#endif
109	if (!pTask)
110	{
111	/*
112	* Allocate completely new.
113	* If this fails we return NULL.
114	*/
115	int rc = MMR3HeapAllocZEx(pEndpointClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
116	sizeof(PDMACTASKFILE),
117	(void **)&pTask);
118	if (RT_FAILURE(rc))
119	pTask = NULL;
120
121	LogFlow(("Allocated task %p\n", pTask));
122	}
123	#if 0
124	else
125	{
126	/* Remove the first element and put the rest into the slot again. */
127	PPDMASYNCCOMPLETIONTASK pTaskHeadNew = pTask->pNext;
128
129	pTaskHeadNew->pPrev = NULL;
130
131	/* Put back into the list adding any new tasks. */
132	while (true)
133	{
134	bool fChanged = ASMAtomicCmpXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], pTaskHeadNew, NULL);
135
136	if (fChanged)
137	break;
138
139	PPDMASYNCCOMPLETIONTASK pTaskHead = (PPDMASYNCCOMPLETIONTASK)ASMAtomicXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], NULL);
140
141	/* The new task could be taken inbetween */
142	if (pTaskHead)
143	{
144	/* Go to the end of the probably much shorter new list. */
145	PPDMASYNCCOMPLETIONTASK pTaskTail = pTaskHead;
146	while (pTaskTail->pNext)
147	pTaskTail = pTaskTail->pNext;
148
149	/* Concatenate */
150	pTaskTail->pNext = pTaskHeadNew;
151
152	pTaskHeadNew = pTaskHead;
153	}
154	/* Another round trying to change the list. */
155	}
156	/* We got a task from the global cache so decrement the counter */
157	ASMAtomicDecU32(&pEndpointClass->cTasksCached);
158	}
159	#endif
160	}
161	else
162	{
163	/* Grab a free task from the head. */
164	AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contains more than one element\n"));
165
166	pTask = pEndpoint->pTasksFreeHead;
167	pEndpoint->pTasksFreeHead = pTask->pNext;
168	ASMAtomicDecU32(&pEndpoint->cTasksCached);
169	}
170
171	pTask->pNext = NULL;
172
173	return pTask;
174	}
175
176	PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
177	{
178	PPDMACTASKFILE pTasks = NULL;
179
180	/*
181	* Get pending tasks.
182	*/
183	pTasks = (PPDMACTASKFILE)ASMAtomicXchgPtr((void * volatile *)&pEndpoint->pTasksNewHead, NULL);
184
185	/* Reverse the list to process in FIFO order. */
186	if (pTasks)
187	{
188	PPDMACTASKFILE pTask = pTasks;
189
190	pTasks = NULL;
191
192	while (pTask)
193	{
194	PPDMACTASKFILE pCur = pTask;
195	pTask = pTask->pNext;
196	pCur->pNext = pTasks;
197	pTasks = pCur;
198	}
199	}
200
201	return pTasks;
202	}
203
204	static void pdmacFileAioMgrWakeup(PPDMACEPFILEMGR pAioMgr)
205	{
206	bool fWokenUp = ASMAtomicXchgBool(&pAioMgr->fWokenUp, true);
207
208	if (!fWokenUp)
209	{
210	int rc = VINF_SUCCESS;
211	bool fWaitingEventSem = ASMAtomicReadBool(&pAioMgr->fWaitingEventSem);
212
213	if (fWaitingEventSem)
214	rc = RTSemEventSignal(pAioMgr->EventSem);
215
216	AssertRC(rc);
217	}
218	}
219
220	static int pdmacFileAioMgrWaitForBlockingEvent(PPDMACEPFILEMGR pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT enmEvent)
221	{
222	int rc = VINF_SUCCESS;
223
224	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, enmEvent);
225	Assert(!pAioMgr->fBlockingEventPending);
226	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, true);
227
228	/* Wakeup the async I/O manager */
229	pdmacFileAioMgrWakeup(pAioMgr);
230
231	/* Wait for completion. */
232	rc = RTSemEventWait(pAioMgr->EventSemBlock, RT_INDEFINITE_WAIT);
233	AssertRC(rc);
234
235	ASMAtomicXchgBool(&pAioMgr->fBlockingEventPending, false);
236	ASMAtomicWriteU32((volatile uint32_t *)&pAioMgr->enmBlockingEvent, PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID);
237
238	return rc;
239	}
240
241	int pdmacFileAioMgrAddEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
242	{
243	int rc;
244
245	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
246	AssertRCReturn(rc, rc);
247
248	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.AddEndpoint.pEndpoint, pEndpoint);
249	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT);
250
251	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
252
253	if (RT_SUCCESS(rc))
254	ASMAtomicWritePtr((void * volatile *)&pEndpoint->pAioMgr, pAioMgr);
255
256	return rc;
257	}
258
259	static int pdmacFileAioMgrRemoveEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
260	{
261	int rc;
262
263	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
264	AssertRCReturn(rc, rc);
265
266	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint, pEndpoint);
267	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT);
268
269	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
270
271	return rc;
272	}
273
274	static int pdmacFileAioMgrCloseEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
275	{
276	int rc;
277
278	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
279	AssertRCReturn(rc, rc);
280
281	ASMAtomicWritePtr((void * volatile *)&pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint, pEndpoint);
282	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT);
283
284	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
285
286	return rc;
287	}
288
289	static int pdmacFileAioMgrShutdown(PPDMACEPFILEMGR pAioMgr)
290	{
291	int rc;
292
293	rc = RTCritSectEnter(&pAioMgr->CritSectBlockingEvent);
294	AssertRCReturn(rc, rc);
295
296	rc = pdmacFileAioMgrWaitForBlockingEvent(pAioMgr, PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN);
297
298	RTCritSectLeave(&pAioMgr->CritSectBlockingEvent);
299
300	return rc;
301	}
302
303	int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask)
304	{
305	PPDMACTASKFILE pNext;
306	do
307	{
308	pNext = pEndpoint->pTasksNewHead;
309	pTask->pNext = pNext;
310	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pEndpoint->pTasksNewHead, (void )pTask, (void *)pNext));
311
312	pdmacFileAioMgrWakeup((PPDMACEPFILEMGR)ASMAtomicReadPtr((void * volatile *)&pEndpoint->pAioMgr));
313
314	return VINF_SUCCESS;
315	}
316
317	void pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser)
318	{
319	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pvUser;
320
321	if (pTask->enmTransferType == PDMACTASKFILETRANSFER_FLUSH)
322	{
323	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, true);
324	}
325	else
326	{
327	Assert((uint32_t)pTask->DataSeg.cbSeg == pTask->DataSeg.cbSeg && (int32_t)pTask->DataSeg.cbSeg >= 0);
328	uint32_t uOld = ASMAtomicSubS32(&pTaskFile->cbTransferLeft, (int32_t)pTask->DataSeg.cbSeg);
329
330	if (!(uOld - pTask->DataSeg.cbSeg)
331	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
332	pdmR3AsyncCompletionCompleteTask(&pTaskFile->Core, true);
333	}
334	}
335
336	int pdmacFileEpTaskInitiate(PPDMASYNCCOMPLETIONTASK pTask,
337	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
338	PCPDMDATASEG paSegments, size_t cSegments,
339	size_t cbTransfer, PDMACTASKFILETRANSFER enmTransfer)
340	{
341	int rc = VINF_SUCCESS;
342	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
343	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
344	PPDMACEPFILEMGR pAioMgr = pEpFile->pAioMgr;
345
346	Assert( (enmTransfer == PDMACTASKFILETRANSFER_READ)
347	\|\| (enmTransfer == PDMACTASKFILETRANSFER_WRITE));
348
349	Assert((uint32_t)cbTransfer == cbTransfer && (int32_t)cbTransfer >= 0);
350	ASMAtomicWriteS32(&pTaskFile->cbTransferLeft, (int32_t)cbTransfer);
351	ASMAtomicWriteBool(&pTaskFile->fCompleted, false);
352
353	for (unsigned i = 0; i < cSegments; i++)
354	{
355	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
356	AssertPtr(pIoTask);
357
358	pIoTask->pEndpoint = pEpFile;
359	pIoTask->enmTransferType = enmTransfer;
360	pIoTask->Off = off;
361	pIoTask->DataSeg.cbSeg = paSegments[i].cbSeg;
362	pIoTask->DataSeg.pvSeg = paSegments[i].pvSeg;
363	pIoTask->pvUser = pTaskFile;
364	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
365
366	/* Send it off to the I/O manager. */
367	pdmacFileEpAddTask(pEpFile, pIoTask);
368	off += paSegments[i].cbSeg;
369	cbTransfer -= paSegments[i].cbSeg;
370	}
371
372	AssertMsg(!cbTransfer, ("Incomplete transfer %u bytes left\n", cbTransfer));
373
374	if (ASMAtomicReadS32(&pTaskFile->cbTransferLeft) == 0
375	&& !ASMAtomicXchgBool(&pTaskFile->fCompleted, true))
376	pdmR3AsyncCompletionCompleteTask(pTask, false);
377	else
378	rc = VINF_AIO_TASK_PENDING;
379
380	return rc;
381	}
382
383	/**
384	* Creates a new async I/O manager.
385	*
386	* @returns VBox status code.
387	* @param pEpClass Pointer to the endpoint class data.
388	* @param ppAioMgr Where to store the pointer to the new async I/O manager on success.
389	* @param enmMgrType Wanted manager type - can be overwritten by the global override.
390	*/
391	int pdmacFileAioMgrCreate(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass, PPPDMACEPFILEMGR ppAioMgr,
392	PDMACEPFILEMGRTYPE enmMgrType)
393	{
394	int rc = VINF_SUCCESS;
395	PPDMACEPFILEMGR pAioMgrNew;
396
397	LogFlowFunc((": Entered\n"));
398
399	rc = MMR3HeapAllocZEx(pEpClass->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION, sizeof(PDMACEPFILEMGR), (void **)&pAioMgrNew);
400	if (RT_SUCCESS(rc))
401	{
402	if (enmMgrType < pEpClass->enmMgrTypeOverride)
403	pAioMgrNew->enmMgrType = enmMgrType;
404	else
405	pAioMgrNew->enmMgrType = pEpClass->enmMgrTypeOverride;
406
407	rc = RTSemEventCreate(&pAioMgrNew->EventSem);
408	if (RT_SUCCESS(rc))
409	{
410	rc = RTSemEventCreate(&pAioMgrNew->EventSemBlock);
411	if (RT_SUCCESS(rc))
412	{
413	rc = RTCritSectInit(&pAioMgrNew->CritSectBlockingEvent);
414	if (RT_SUCCESS(rc))
415	{
416	/* Init the rest of the manager. */
417	if (pAioMgrNew->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
418	rc = pdmacFileAioMgrNormalInit(pAioMgrNew);
419
420	if (RT_SUCCESS(rc))
421	{
422	pAioMgrNew->enmState = PDMACEPFILEMGRSTATE_RUNNING;
423
424	rc = RTThreadCreateF(&pAioMgrNew->Thread,
425	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
426	? pdmacFileAioMgrFailsafe
427	: pdmacFileAioMgrNormal,
428	pAioMgrNew,
429	0,
430	RTTHREADTYPE_IO,
431	0,
432	"AioMgr%d-%s", pEpClass->cAioMgrs,
433	pAioMgrNew->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE
434	? "F"
435	: "N");
436	if (RT_SUCCESS(rc))
437	{
438	/* Link it into the list. */
439	RTCritSectEnter(&pEpClass->CritSect);
440	pAioMgrNew->pNext = pEpClass->pAioMgrHead;
441	if (pEpClass->pAioMgrHead)
442	pEpClass->pAioMgrHead->pPrev = pAioMgrNew;
443	pEpClass->pAioMgrHead = pAioMgrNew;
444	pEpClass->cAioMgrs++;
445	RTCritSectLeave(&pEpClass->CritSect);
446
447	*ppAioMgr = pAioMgrNew;
448
449	Log(("PDMAC: Successfully created new file AIO Mgr {%s}\n", RTThreadGetName(pAioMgrNew->Thread)));
450	return VINF_SUCCESS;
451	}
452	pdmacFileAioMgrNormalDestroy(pAioMgrNew);
453	}
454	RTCritSectDelete(&pAioMgrNew->CritSectBlockingEvent);
455	}
456	RTSemEventDestroy(pAioMgrNew->EventSem);
457	}
458	RTSemEventDestroy(pAioMgrNew->EventSemBlock);
459	}
460	MMR3HeapFree(pAioMgrNew);
461	}
462
463	LogFlowFunc((": Leave rc=%Rrc\n", rc));
464
465	return rc;
466	}
467
468	/**
469	* Destroys a async I/O manager.
470	*
471	* @returns nothing.
472	* @param pAioMgr The async I/O manager to destroy.
473	*/
474	static void pdmacFileAioMgrDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile, PPDMACEPFILEMGR pAioMgr)
475	{
476	int rc = pdmacFileAioMgrShutdown(pAioMgr);
477	AssertRC(rc);
478
479	/* Unlink from the list. */
480	rc = RTCritSectEnter(&pEpClassFile->CritSect);
481	AssertRC(rc);
482
483	PPDMACEPFILEMGR pPrev = pAioMgr->pPrev;
484	PPDMACEPFILEMGR pNext = pAioMgr->pNext;
485
486	if (pPrev)
487	pPrev->pNext = pNext;
488	else
489	pEpClassFile->pAioMgrHead = pNext;
490
491	if (pNext)
492	pNext->pPrev = pPrev;
493
494	pEpClassFile->cAioMgrs--;
495	rc = RTCritSectLeave(&pEpClassFile->CritSect);
496	AssertRC(rc);
497
498	/* Free the ressources. */
499	RTCritSectDelete(&pAioMgr->CritSectBlockingEvent);
500	RTSemEventDestroy(pAioMgr->EventSem);
501	if (pAioMgr->enmMgrType != PDMACEPFILEMGRTYPE_SIMPLE)
502	pdmacFileAioMgrNormalDestroy(pAioMgr);
503
504	MMR3HeapFree(pAioMgr);
505	}
506
507	static int pdmacFileBwMgrInitialize(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile,
508	PCFGMNODE pCfgNode, PPPDMACFILEBWMGR ppBwMgr)
509	{
510	int rc = VINF_SUCCESS;
511	PPDMACFILEBWMGR pBwMgr = NULL;
512
513	rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
514	sizeof(PDMACFILEBWMGR),
515	(void **)&pBwMgr);
516	if (RT_SUCCESS(rc))
517	{
518	/* Init I/O flow control. */
519	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecMax", &pBwMgr->cbVMTransferPerSecMax, UINT32_MAX);
520	AssertLogRelRCReturn(rc, rc);
521	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecStart", &pBwMgr->cbVMTransferPerSecStart, 5 * _1M);
522	AssertLogRelRCReturn(rc, rc);
523	rc = CFGMR3QueryU32Def(pCfgNode, "VMTransferPerSecStep", &pBwMgr->cbVMTransferPerSecStep, _1M);
524	AssertLogRelRCReturn(rc, rc);
525
526	pBwMgr->cbVMTransferAllowed = pBwMgr->cbVMTransferPerSecStart;
527	pBwMgr->tsUpdatedLast = RTTimeSystemNanoTS();
528
529	if (pBwMgr->cbVMTransferPerSecMax != UINT32_MAX)
530	LogRel(("AIOMgr: I/O bandwidth limited to %u bytes/sec\n", pBwMgr->cbVMTransferPerSecMax));
531	else
532	LogRel(("AIOMgr: I/O bandwidth not limited\n"));
533
534	*ppBwMgr = pBwMgr;
535	}
536
537	return rc;
538	}
539
540	static void pdmacFileBwMgrDestroy(PPDMACFILEBWMGR pBwMgr)
541	{
542	MMR3HeapFree(pBwMgr);
543	}
544
545	static void pdmacFileBwRef(PPDMACFILEBWMGR pBwMgr)
546	{
547	pBwMgr->cRefs++;
548	}
549
550	static void pdmacFileBwUnref(PPDMACFILEBWMGR pBwMgr)
551	{
552	Assert(pBwMgr->cRefs > 0);
553	pBwMgr->cRefs--;
554	}
555
556	bool pdmacFileBwMgrIsTransferAllowed(PPDMACFILEBWMGR pBwMgr, uint32_t cbTransfer)
557	{
558	bool fAllowed = false;
559
560	LogFlowFunc(("pBwMgr=%p cbTransfer=%u\n", pBwMgr, cbTransfer));
561
562	uint32_t cbOld = ASMAtomicSubU32(&pBwMgr->cbVMTransferAllowed, cbTransfer);
563	if (RT_LIKELY(cbOld >= cbTransfer))
564	fAllowed = true;
565	else
566	{
567	/* We are out of ressources Check if we can update again. */
568	uint64_t tsNow = RTTimeSystemNanoTS();
569	uint64_t tsUpdatedLast = ASMAtomicUoReadU64(&pBwMgr->tsUpdatedLast);
570
571	if (tsNow - tsUpdatedLast >= (100010001000))
572	{
573	if (ASMAtomicCmpXchgU64(&pBwMgr->tsUpdatedLast, tsNow, tsUpdatedLast))
574	{
575	if (pBwMgr->cbVMTransferPerSecStart < pBwMgr->cbVMTransferPerSecMax)
576	{
577	pBwMgr->cbVMTransferPerSecStart = RT_MIN(pBwMgr->cbVMTransferPerSecMax, pBwMgr->cbVMTransferPerSecStart + pBwMgr->cbVMTransferPerSecStep);
578	LogFlow(("AIOMgr: Increasing maximum bandwidth to %u bytes/sec\n", pBwMgr->cbVMTransferPerSecStart));
579	}
580
581	/* Update */
582	ASMAtomicWriteU32(&pBwMgr->cbVMTransferAllowed, pBwMgr->cbVMTransferPerSecStart - cbTransfer);
583	fAllowed = true;
584	LogFlow(("AIOMgr: Refreshed bandwidth\n"));
585	}
586	}
587	else
588	ASMAtomicAddU32(&pBwMgr->cbVMTransferAllowed, cbTransfer);
589	}
590
591	LogFlowFunc(("fAllowed=%RTbool\n", fAllowed));
592
593	return fAllowed;
594	}
595
596	static int pdmacFileMgrTypeFromName(const char *pszVal, PPDMACEPFILEMGRTYPE penmMgrType)
597	{
598	int rc = VINF_SUCCESS;
599
600	if (!RTStrCmp(pszVal, "Simple"))
601	*penmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
602	else if (!RTStrCmp(pszVal, "Async"))
603	*penmMgrType = PDMACEPFILEMGRTYPE_ASYNC;
604	else
605	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
606
607	return rc;
608	}
609
610	static const char *pdmacFileMgrTypeToName(PDMACEPFILEMGRTYPE enmMgrType)
611	{
612	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
613	return "Simple";
614	if (enmMgrType == PDMACEPFILEMGRTYPE_ASYNC)
615	return "Async";
616
617	return NULL;
618	}
619
620	static int pdmacFileBackendTypeFromName(const char *pszVal, PPDMACFILEEPBACKEND penmBackendType)
621	{
622	int rc = VINF_SUCCESS;
623
624	if (!RTStrCmp(pszVal, "Buffered"))
625	*penmBackendType = PDMACFILEEPBACKEND_BUFFERED;
626	else if (!RTStrCmp(pszVal, "NonBuffered"))
627	*penmBackendType = PDMACFILEEPBACKEND_NON_BUFFERED;
628	else
629	rc = VERR_CFGM_CONFIG_UNKNOWN_VALUE;
630
631	return rc;
632	}
633
634	static const char *pdmacFileBackendTypeToName(PDMACFILEEPBACKEND enmBackendType)
635	{
636	if (enmBackendType == PDMACFILEEPBACKEND_BUFFERED)
637	return "Buffered";
638	if (enmBackendType == PDMACFILEEPBACKEND_NON_BUFFERED)
639	return "NonBuffered";
640
641	return NULL;
642	}
643
644	static int pdmacFileInitialize(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals, PCFGMNODE pCfgNode)
645	{
646	int rc = VINF_SUCCESS;
647	RTFILEAIOLIMITS AioLimits; /** < Async I/O limitations. */
648
649	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
650
651	rc = RTFileAioGetLimits(&AioLimits);
652	#ifdef DEBUG
653	if (RT_SUCCESS(rc) && RTEnvExist("VBOX_ASYNC_IO_FAILBACK"))
654	rc = VERR_ENV_VAR_NOT_FOUND;
655	#endif
656	if (RT_FAILURE(rc))
657	{
658	LogRel(("AIO: Async I/O manager not supported (rc=%Rrc). Falling back to simple manager\n",
659	rc));
660	pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_SIMPLE;
661	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_BUFFERED;
662	}
663	else
664	{
665	pEpClassFile->uBitmaskAlignment = AioLimits.cbBufferAlignment ? ~((RTR3UINTPTR)AioLimits.cbBufferAlignment - 1) : RTR3UINTPTR_MAX;
666	pEpClassFile->cReqsOutstandingMax = AioLimits.cReqsOutstandingMax;
667
668	if (pCfgNode)
669	{
670	/* Query the default manager type */
671	char *pszVal = NULL;
672	rc = CFGMR3QueryStringAllocDef(pCfgNode, "IoMgr", &pszVal, "Async");
673	AssertLogRelRCReturn(rc, rc);
674
675	rc = pdmacFileMgrTypeFromName(pszVal, &pEpClassFile->enmMgrTypeOverride);
676	MMR3HeapFree(pszVal);
677	if (RT_FAILURE(rc))
678	return rc;
679
680	LogRel(("AIOMgr: Default manager type is \"%s\"\n", pdmacFileMgrTypeToName(pEpClassFile->enmMgrTypeOverride)));
681
682	/* Query default backend type */
683	#ifndef RT_OS_LINUX
684	rc = CFGMR3QueryStringAllocDef(pCfgNode, "FileBackend", &pszVal, "Buffered");
685	#else /* Linux can't use buffered with async */
686	rc = CFGMR3QueryStringAllocDef(pCfgNode, "FileBackend", &pszVal, "NonBuffered");
687	#endif
688	AssertLogRelRCReturn(rc, rc);
689
690	rc = pdmacFileBackendTypeFromName(pszVal, &pEpClassFile->enmEpBackendDefault);
691	MMR3HeapFree(pszVal);
692	if (RT_FAILURE(rc))
693	return rc;
694
695	LogRel(("AIOMgr: Default file backend is \"%s\"\n", pdmacFileBackendTypeToName(pEpClassFile->enmEpBackendDefault)));
696
697	#ifdef RT_OS_LINUX
698	if ( pEpClassFile->enmMgrTypeOverride == PDMACEPFILEMGRTYPE_ASYNC
699	&& pEpClassFile->enmEpBackendDefault == PDMACFILEEPBACKEND_BUFFERED)
700	{
701	LogRel(("AIOMgr: Linux does not support buffered async I/O, changing to non buffered\n"));
702	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
703	}
704	#endif
705	}
706	else
707	{
708	/* No configuration supplied, set defaults */
709	pEpClassFile->enmMgrTypeOverride = PDMACEPFILEMGRTYPE_ASYNC;
710	#ifdef RT_OS_LINUX
711	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_NON_BUFFERED;
712	#else
713	pEpClassFile->enmEpBackendDefault = PDMACFILEEPBACKEND_BUFFERED;
714	#endif
715	}
716	}
717
718	/* Init critical section. */
719	rc = RTCritSectInit(&pEpClassFile->CritSect);
720	if (RT_SUCCESS(rc))
721	{
722	/* Check if the cache was disabled by the user. */
723	rc = CFGMR3QueryBoolDef(pCfgNode, "CacheEnabled", &pEpClassFile->fCacheEnabled, true);
724	AssertLogRelRCReturn(rc, rc);
725
726	if (pEpClassFile->fCacheEnabled)
727	{
728	/* Init cache structure */
729	rc = pdmacFileCacheInit(pEpClassFile, pCfgNode);
730	if (RT_FAILURE(rc))
731	{
732	pEpClassFile->fCacheEnabled = false;
733	LogRel(("AIOMgr: Failed to initialise the cache (rc=%Rrc), disabled caching\n"));
734	}
735	}
736	else
737	LogRel(("AIOMgr: Cache was globally disabled\n"));
738
739	rc = pdmacFileBwMgrInitialize(pEpClassFile, pCfgNode, &pEpClassFile->pBwMgr);
740	if (RT_FAILURE(rc))
741	RTCritSectDelete(&pEpClassFile->CritSect);
742	}
743
744	return rc;
745	}
746
747	static void pdmacFileTerminate(PPDMASYNCCOMPLETIONEPCLASS pClassGlobals)
748	{
749	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pClassGlobals;
750
751	/* All endpoints should be closed at this point. */
752	AssertMsg(!pEpClassFile->Core.pEndpointsHead, ("There are still endpoints left\n"));
753
754	/* Destroy all left async I/O managers. */
755	while (pEpClassFile->pAioMgrHead)
756	pdmacFileAioMgrDestroy(pEpClassFile, pEpClassFile->pAioMgrHead);
757
758	/* Destroy the cache. */
759	if (pEpClassFile->fCacheEnabled)
760	pdmacFileCacheDestroy(pEpClassFile);
761
762	RTCritSectDelete(&pEpClassFile->CritSect);
763	pdmacFileBwMgrDestroy(pEpClassFile->pBwMgr);
764	}
765
766	static int pdmacFileEpInitialize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint,
767	const char *pszUri, uint32_t fFlags)
768	{
769	int rc = VINF_SUCCESS;
770	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
771	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
772	PDMACEPFILEMGRTYPE enmMgrType = pEpClassFile->enmMgrTypeOverride;
773	PDMACFILEEPBACKEND enmEpBackend = pEpClassFile->enmEpBackendDefault;
774
775	AssertMsgReturn((fFlags & ~(PDMACEP_FILE_FLAGS_READ_ONLY \| PDMACEP_FILE_FLAGS_CACHING)) == 0,
776	("PDMAsyncCompletion: Invalid flag specified\n"), VERR_INVALID_PARAMETER);
777
778	unsigned fFileFlags = fFlags & PDMACEP_FILE_FLAGS_READ_ONLY
779	? RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE
780	: RTFILE_O_READWRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_WRITE;
781
782	if (enmEpBackend == PDMACFILEEPBACKEND_NON_BUFFERED)
783	{
784	/*
785	* We only disable the cache if the size of the file is a multiple of 512.
786	* Certain hosts like Windows, Linux and Solaris require that transfer sizes
787	* are aligned to the volume sector size.
788	* If not we just make sure that the data is written to disk with RTFILE_O_WRITE_THROUGH
789	* which will trash the host cache but ensures that the host cache will not
790	* contain dirty buffers.
791	*/
792	RTFILE File = NIL_RTFILE;
793
794	rc = RTFileOpen(&File, pszUri, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
795	if (RT_SUCCESS(rc))
796	{
797	uint64_t cbSize;
798
799	rc = RTFileGetSize(File, &cbSize);
800	if (RT_SUCCESS(rc) && ((cbSize % 512) == 0))
801	fFileFlags \|= RTFILE_O_NO_CACHE;
802	else
803	{
804	/* Downgrade to the buffered backend */
805	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
806	}
807	RTFileClose(File);
808	}
809	}
810
811	/* Open with final flags. */
812	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
813	if ((rc == VERR_INVALID_FUNCTION) \|\| (rc == VERR_INVALID_PARAMETER))
814	{
815	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed with %Rrc\n",
816	pszUri, fFileFlags, rc));
817	/*
818	* Solaris doesn't support directio on ZFS so far. :-\
819	* Trying to enable it returns VERR_INVALID_FUNCTION
820	* (ENOTTY). Remove it and hope for the best.
821	* ZFS supports write throttling in case applications
822	* write more data than can be synced to the disk
823	* without blocking the whole application.
824	*
825	* On Linux we have the same problem with cifs.
826	* Have to disable async I/O here too because it requires O_DIRECT.
827	*/
828	fFileFlags &= ~RTFILE_O_NO_CACHE;
829	enmEpBackend = PDMACFILEEPBACKEND_BUFFERED;
830
831	#ifdef RT_OS_LINUX
832	fFileFlags &= ~RTFILE_O_ASYNC_IO;
833	enmMgrType = PDMACEPFILEMGRTYPE_SIMPLE;
834	#endif
835
836	/* Open again. */
837	rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
838
839	if (RT_FAILURE(rc))
840	{
841	LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed AGAIN(!) with %Rrc\n",
842	pszUri, fFileFlags, rc));
843	}
844	}
845
846	if (RT_SUCCESS(rc))
847	{
848	pEpFile->fFlags = fFileFlags;
849
850	rc = RTFileGetSize(pEpFile->File, (uint64_t *)&pEpFile->cbFile);
851	if (RT_SUCCESS(rc) && (pEpFile->cbFile == 0))
852	{
853	/* Could be a block device */
854	rc = RTFileSeek(pEpFile->File, 0, RTFILE_SEEK_END, (uint64_t *)&pEpFile->cbFile);
855	}
856
857	if (RT_SUCCESS(rc))
858	{
859	/* Initialize the segment cache */
860	rc = MMR3HeapAllocZEx(pEpClassFile->Core.pVM, MM_TAG_PDM_ASYNC_COMPLETION,
861	sizeof(PDMACTASKFILE),
862	(void **)&pEpFile->pTasksFreeHead);
863	if (RT_SUCCESS(rc))
864	{
865	PPDMACEPFILEMGR pAioMgr = NULL;
866
867	pEpFile->pTasksFreeTail = pEpFile->pTasksFreeHead;
868	pEpFile->cTasksCached = 0;
869	pEpFile->pBwMgr = pEpClassFile->pBwMgr;
870	pEpFile->enmBackendType = enmEpBackend;
871	pdmacFileBwRef(pEpFile->pBwMgr);
872
873	if (enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
874	{
875	/* Simple mode. Every file has its own async I/O manager. */
876	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, PDMACEPFILEMGRTYPE_SIMPLE);
877	AssertRC(rc);
878	}
879	else
880	{
881	if ( (fFlags & PDMACEP_FILE_FLAGS_CACHING)
882	&& (pEpClassFile->fCacheEnabled))
883	{
884	pEpFile->fCaching = true;
885	rc = pdmacFileEpCacheInit(pEpFile, pEpClassFile);
886	if (RT_FAILURE(rc))
887	{
888	LogRel(("AIOMgr: Endpoint for \"%s\" was opened with caching but initializing cache failed. Disabled caching\n", pszUri));
889	pEpFile->fCaching = false;
890	}
891	}
892
893	pAioMgr = pEpClassFile->pAioMgrHead;
894
895	/* Check for an idling manager of the same type */
896	while (pAioMgr)
897	{
898	if (pAioMgr->enmMgrType == enmMgrType)
899	break;
900	pAioMgr = pAioMgr->pNext;
901	}
902
903	if (!pAioMgr)
904	{
905	rc = pdmacFileAioMgrCreate(pEpClassFile, &pAioMgr, enmMgrType);
906	AssertRC(rc);
907	}
908	}
909
910	pEpFile->AioMgr.pTreeRangesLocked = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE));
911	if (!pEpFile->AioMgr.pTreeRangesLocked)
912	rc = VERR_NO_MEMORY;
913	else
914	{
915	pEpFile->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE;
916
917	/* Assign the endpoint to the thread. */
918	rc = pdmacFileAioMgrAddEndpoint(pAioMgr, pEpFile);
919	if (RT_FAILURE(rc))
920	{
921	RTMemFree(pEpFile->AioMgr.pTreeRangesLocked);
922	MMR3HeapFree(pEpFile->pTasksFreeHead);
923	pdmacFileBwUnref(pEpFile->pBwMgr);
924	}
925	}
926	}
927	}
928
929	if (RT_FAILURE(rc))
930	RTFileClose(pEpFile->File);
931	}
932
933	#ifdef VBOX_WITH_STATISTICS
934	if (RT_SUCCESS(rc))
935	{
936	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatRead,
937	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
938	STAMUNIT_TICKS_PER_CALL, "Time taken to read from the endpoint",
939	"/PDM/AsyncCompletion/File/%s/Read", RTPathFilename(pEpFile->Core.pszUri));
940
941	STAMR3RegisterF(pEpClassFile->Core.pVM, &pEpFile->StatWrite,
942	STAMTYPE_PROFILE_ADV, STAMVISIBILITY_ALWAYS,
943	STAMUNIT_TICKS_PER_CALL, "Time taken to write to the endpoint",
944	"/PDM/AsyncCompletion/File/%s/Write", RTPathFilename(pEpFile->Core.pszUri));
945	}
946	#endif
947
948	if (RT_SUCCESS(rc))
949	LogRel(("AIOMgr: Endpoint for file '%s' (flags %08x) created successfully\n", pszUri, pEpFile->fFlags));
950
951	return rc;
952	}
953
954	static int pdmacFileEpRangesLockedDestroy(PAVLRFOFFNODECORE pNode, void *pvUser)
955	{
956	AssertMsgFailed(("The locked ranges tree should be empty at that point\n"));
957	return VINF_SUCCESS;
958	}
959
960	static int pdmacFileEpClose(PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
961	{
962	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
963	PPDMASYNCCOMPLETIONEPCLASSFILE pEpClassFile = (PPDMASYNCCOMPLETIONEPCLASSFILE)pEndpoint->pEpClass;
964
965	/* Make sure that all tasks finished for this endpoint. */
966	int rc = pdmacFileAioMgrCloseEndpoint(pEpFile->pAioMgr, pEpFile);
967	AssertRC(rc);
968
969	/*
970	* If the async I/O manager is in failsafe mode this is the only endpoint
971	* he processes and thus can be destroyed now.
972	*/
973	if (pEpFile->pAioMgr->enmMgrType == PDMACEPFILEMGRTYPE_SIMPLE)
974	pdmacFileAioMgrDestroy(pEpClassFile, pEpFile->pAioMgr);
975
976	/* Free cached tasks. */
977	PPDMACTASKFILE pTask = pEpFile->pTasksFreeHead;
978
979	while (pTask)
980	{
981	PPDMACTASKFILE pTaskFree = pTask;
982	pTask = pTask->pNext;
983	MMR3HeapFree(pTaskFree);
984	}
985
986	/* Free the cached data. */
987	if (pEpFile->fCaching)
988	pdmacFileEpCacheDestroy(pEpFile);
989
990	/* Remove from the bandwidth manager */
991	pdmacFileBwUnref(pEpFile->pBwMgr);
992
993	/* Destroy the locked ranges tree now. */
994	RTAvlrFileOffsetDestroy(pEpFile->AioMgr.pTreeRangesLocked, pdmacFileEpRangesLockedDestroy, NULL);
995
996	RTFileClose(pEpFile->File);
997
998	#ifdef VBOX_WITH_STATISTICS
999	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatRead);
1000	STAMR3Deregister(pEpClassFile->Core.pVM, &pEpFile->StatWrite);
1001	#endif
1002
1003	return VINF_SUCCESS;
1004	}
1005
1006	static int pdmacFileEpRead(PPDMASYNCCOMPLETIONTASK pTask,
1007	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
1008	PCPDMDATASEG paSegments, size_t cSegments,
1009	size_t cbRead)
1010	{
1011	int rc = VINF_SUCCESS;
1012	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1013
1014	STAM_PROFILE_ADV_START(&pEpFile->StatRead, Read);
1015
1016	if (pEpFile->fCaching)
1017	rc = pdmacFileEpCacheRead(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
1018	off, paSegments, cSegments, cbRead);
1019	else
1020	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbRead,
1021	PDMACTASKFILETRANSFER_READ);
1022
1023	STAM_PROFILE_ADV_STOP(&pEpFile->StatRead, Read);
1024
1025	return rc;
1026	}
1027
1028	static int pdmacFileEpWrite(PPDMASYNCCOMPLETIONTASK pTask,
1029	PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
1030	PCPDMDATASEG paSegments, size_t cSegments,
1031	size_t cbWrite)
1032	{
1033	int rc = VINF_SUCCESS;
1034	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1035
1036	if (RT_UNLIKELY(pEpFile->fReadonly))
1037	return VERR_NOT_SUPPORTED;
1038
1039	STAM_PROFILE_ADV_START(&pEpFile->StatWrite, Write);
1040
1041	if (pEpFile->fCaching)
1042	rc = pdmacFileEpCacheWrite(pEpFile, (PPDMASYNCCOMPLETIONTASKFILE)pTask,
1043	off, paSegments, cSegments, cbWrite);
1044	else
1045	rc = pdmacFileEpTaskInitiate(pTask, pEndpoint, off, paSegments, cSegments, cbWrite,
1046	PDMACTASKFILETRANSFER_WRITE);
1047
1048	STAM_PROFILE_ADV_STOP(&pEpFile->StatWrite, Write);
1049
1050	return rc;
1051	}
1052
1053	static int pdmacFileEpFlush(PPDMASYNCCOMPLETIONTASK pTask,
1054	PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
1055	{
1056	int rc = VINF_SUCCESS;
1057	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1058	PPDMASYNCCOMPLETIONTASKFILE pTaskFile = (PPDMASYNCCOMPLETIONTASKFILE)pTask;
1059
1060	if (RT_UNLIKELY(pEpFile->fReadonly))
1061	return VERR_NOT_SUPPORTED;
1062
1063	pTaskFile->cbTransferLeft = 0;
1064
1065	if (pEpFile->fCaching)
1066	rc = pdmacFileEpCacheFlush(pEpFile, pTaskFile);
1067	else
1068	{
1069	PPDMACTASKFILE pIoTask = pdmacFileTaskAlloc(pEpFile);
1070	AssertPtr(pIoTask);
1071
1072	pIoTask->pEndpoint = pEpFile;
1073	pIoTask->enmTransferType = PDMACTASKFILETRANSFER_FLUSH;
1074	pIoTask->pvUser = pTaskFile;
1075	pIoTask->pfnCompleted = pdmacFileEpTaskCompleted;
1076	pdmacFileEpAddTask(pEpFile, pIoTask);
1077	rc = VINF_AIO_TASK_PENDING;
1078	}
1079
1080	return rc;
1081	}
1082
1083	static int pdmacFileEpGetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, uint64_t *pcbSize)
1084	{
1085	PPDMASYNCCOMPLETIONENDPOINTFILE pEpFile = (PPDMASYNCCOMPLETIONENDPOINTFILE)pEndpoint;
1086
1087	*pcbSize = ASMAtomicReadU64(&pEpFile->cbFile);
1088
1089	return VINF_SUCCESS;
1090	}
1091
1092	const PDMASYNCCOMPLETIONEPCLASSOPS g_PDMAsyncCompletionEndpointClassFile =
1093	{
1094	/* u32Version */
1095	PDMAC_EPCLASS_OPS_VERSION,
1096	/* pcszName */
1097	"File",
1098	/* enmClassType */
1099	PDMASYNCCOMPLETIONEPCLASSTYPE_FILE,
1100	/* cbEndpointClassGlobal */
1101	sizeof(PDMASYNCCOMPLETIONEPCLASSFILE),
1102	/* cbEndpoint */
1103	sizeof(PDMASYNCCOMPLETIONENDPOINTFILE),
1104	/* cbTask */
1105	sizeof(PDMASYNCCOMPLETIONTASKFILE),
1106	/* pfnInitialize */
1107	pdmacFileInitialize,
1108	/* pfnTerminate */
1109	pdmacFileTerminate,
1110	/* pfnEpInitialize. */
1111	pdmacFileEpInitialize,
1112	/* pfnEpClose */
1113	pdmacFileEpClose,
1114	/* pfnEpRead */
1115	pdmacFileEpRead,
1116	/* pfnEpWrite */
1117	pdmacFileEpWrite,
1118	/* pfnEpFlush */
1119	pdmacFileEpFlush,
1120	/* pfnEpGetSize */
1121	pdmacFileEpGetSize,
1122	/* u32VersionEnd */
1123	PDMAC_EPCLASS_OPS_VERSION
1124	};
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source: vbox/trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp@ 27476

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