DrvDiskIntegrity.cpp@ 33400

Last change on this file since 33400 was 30112, checked in by vboxsync, 15 years ago
iprt/asm.h,*: Added ASMAtomicWriteNullPtr and ASMAtomicUoWriteNullPtr to better deal with NULL being 0 in C++.
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1	/* $Id: DrvDiskIntegrity.cpp 30112 2010-06-09 12:31:50Z vboxsync $ */
2	/** @file
3	* VBox storage devices: Disk integrity check.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 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_DRV_DISK_INTEGRITY
23	#include <VBox/pdmdrv.h>
24	#include <iprt/assert.h>
25	#include <iprt/string.h>
26	#include <iprt/uuid.h>
27	#include <iprt/avl.h>
28	#include <iprt/mem.h>
29	#include <iprt/message.h>
30	#include <iprt/sg.h>
31	#include <iprt/time.h>
32	#include <iprt/semaphore.h>
33	#include <iprt/asm.h>
34
35	#include "Builtins.h"
36
37
38	/*******************************************************************************
39	* Structures and Typedefs *
40	*******************************************************************************/
41
42	/**
43	* Transfer direction.
44	*/
45	typedef enum DRVDISKAIOTXDIR
46	{
47	/** Read */
48	DRVDISKAIOTXDIR_READ = 0,
49	/** Write */
50	DRVDISKAIOTXDIR_WRITE,
51	/** Flush */
52	DRVDISKAIOTXDIR_FLUSH
53	} DRVDISKAIOTXDIR;
54
55	/**
56	* async I/O request.
57	*/
58	typedef struct DRVDISKAIOREQ
59	{
60	/** Transfer direction. */
61	DRVDISKAIOTXDIR enmTxDir;
62	/** Start offset. */
63	uint64_t off;
64	/** Transfer size. */
65	size_t cbTransfer;
66	/** Segment array. */
67	PCRTSGSEG paSeg;
68	/** Number of array entries. */
69	unsigned cSeg;
70	/** User argument */
71	void *pvUser;
72	/** Slot in the array. */
73	unsigned iSlot;
74	/** Start timestamp */
75	uint64_t tsStart;
76	/** Completion timestamp. */
77	uint64_t tsComplete;
78	} DRVDISKAIOREQ, *PDRVDISKAIOREQ;
79
80	/**
81	* I/O log entry.
82	*/
83	typedef struct IOLOGENT
84	{
85	/** Start offset */
86	uint64_t off;
87	/** Write size */
88	size_t cbWrite;
89	/** Number of references to this entry. */
90	unsigned cRefs;
91	} IOLOGENT, *PIOLOGENT;
92
93	/**
94	* Disk segment.
95	*/
96	typedef struct DRVDISKSEGMENT
97	{
98	/** AVL core. */
99	AVLRFOFFNODECORE Core;
100	/** Size of the segment */
101	size_t cbSeg;
102	/** Data for this segment */
103	uint8_t *pbSeg;
104	/** Numbner of entries in the I/O array. */
105	unsigned cIoLogEntries;
106	/** Array of I/O log references. */
107	PIOLOGENT apIoLog[1];
108	} DRVDISKSEGMENT, *PDRVDISKSEGMENT;
109
110	/**
111	* Active requests list entry.
112	*/
113	typedef struct DRVDISKAIOREQACTIVE
114	{
115	/** Pointer to the request. */
116	volatile PDRVDISKAIOREQ pIoReq;
117	/** Start timestamp. */
118	uint64_t tsStart;
119	} DRVDISKAIOREQACTIVE, *PDRVDISKAIOREQACTIVE;
120
121	/**
122	* Disk integrity driver instance data.
123	*
124	* @implements PDMIMEDIA
125	*/
126	typedef struct DRVDISKINTEGRITY
127	{
128	/** Pointer driver instance. */
129	PPDMDRVINS pDrvIns;
130	/** Pointer to the media driver below us.
131	* This is NULL if the media is not mounted. */
132	PPDMIMEDIA pDrvMedia;
133	/** Our media interface */
134	PDMIMEDIA IMedia;
135
136	/** Pointer to the media async driver below us.
137	* This is NULL if the media is not mounted. */
138	PPDMIMEDIAASYNC pDrvMediaAsync;
139	/** Our media async interface */
140	PDMIMEDIAASYNC IMediaAsync;
141
142	/** The async media port interface above. */
143	PPDMIMEDIAASYNCPORT pDrvMediaAsyncPort;
144	/** Our media async port interface */
145	PDMIMEDIAASYNCPORT IMediaAsyncPort;
146
147	/** Flag whether consistency checks are enabled. */
148	bool fCheckConsistency;
149	/** AVL tree containing the disk blocks to check. */
150	PAVLRFOFFTREE pTreeSegments;
151
152	/** Flag whether async request tracing is enabled. */
153	bool fTraceRequests;
154	/** Interval the thread should check for expired requests (milliseconds). */
155	uint32_t uCheckIntervalMs;
156	/** Expire timeout for a request (milliseconds). */
157	uint32_t uExpireIntervalMs;
158	/** Thread which checks for lost requests. */
159	RTTHREAD hThread;
160	/** Event semaphore */
161	RTSEMEVENT SemEvent;
162	/** Flag whether the thread should run. */
163	bool fRunning;
164	/** Array containing active requests. */
165	DRVDISKAIOREQACTIVE apReqActive[128];
166	/** Next free slot in the array */
167	volatile unsigned iNextFreeSlot;
168
169	/** Flag whether we check for requests completing twice. */
170	bool fCheckDoubleCompletion;
171	/** Number of requests we go back. */
172	unsigned cEntries;
173	/** Array of completed but still observed requests. */
174	PDRVDISKAIOREQ *papIoReq;
175	/** Current entry in the array. */
176	unsigned iEntry;
177	} DRVDISKINTEGRITY, *PDRVDISKINTEGRITY;
178
179
180	/**
181	* Allocate a new I/O request.
182	*
183	* @returns New I/O request.
184	* @param enmTxDir Transfer direction.
185	* @param off Start offset.
186	* @param paSeg Segment array.
187	* @param cSeg Number of segments.
188	* @param cbTransfer Number of bytes to transfer.
189	* @param pvUser User argument.
190	*/
191	static PDRVDISKAIOREQ drvdiskintIoReqAlloc(DRVDISKAIOTXDIR enmTxDir, uint64_t off, PCRTSGSEG paSeg,
192	unsigned cSeg, size_t cbTransfer, void *pvUser)
193	{
194	PDRVDISKAIOREQ pIoReq = (PDRVDISKAIOREQ)RTMemAlloc(sizeof(DRVDISKAIOREQ));
195
196	if (RT_LIKELY(pIoReq))
197	{
198	pIoReq->enmTxDir = enmTxDir;
199	pIoReq->off = off;
200	pIoReq->cbTransfer = cbTransfer;
201	pIoReq->paSeg = paSeg;
202	pIoReq->cSeg = cSeg;
203	pIoReq->pvUser = pvUser;
204	pIoReq->iSlot = 0;
205	pIoReq->tsStart = RTTimeSystemMilliTS();
206	pIoReq->tsComplete = 0;
207	}
208
209	return pIoReq;
210	}
211
212	/**
213	* Free a async I/O request.
214	*
215	* @returns nothing.
216	* @param pThis Disk driver.
217	* @param pIoReq The I/O request to free.
218	*/
219	static void drvdiskintIoReqFree(PDRVDISKINTEGRITY pThis, PDRVDISKAIOREQ pIoReq)
220	{
221	if (pThis->fCheckDoubleCompletion)
222	{
223	/* Search if the I/O request completed already. */
224	for (unsigned i = 0; i < pThis->cEntries; i++)
225	{
226	if (RT_UNLIKELY(pThis->papIoReq[i] == pIoReq))
227	{
228	RTMsgError("Request %#p completed already!\n", pIoReq);
229	RTMsgError("Start timestamp %llu Completion timestamp %llu (completed after %llu ms)\n",
230	pIoReq->tsStart, pIoReq->tsComplete, pIoReq->tsComplete - pIoReq->tsStart);
231	RTAssertDebugBreak();
232	}
233	}
234
235	pIoReq->tsComplete = RTTimeSystemMilliTS();
236	Assert(!pThis->papIoReq[pThis->iEntry]);
237	pThis->papIoReq[pThis->iEntry] = pIoReq;
238
239	pThis->iEntry = (pThis->iEntry+1) % pThis->cEntries;
240	if (pThis->papIoReq[pThis->iEntry])
241	{
242	RTMemFree(pThis->papIoReq[pThis->iEntry]);
243	pThis->papIoReq[pThis->iEntry] = NULL;
244	}
245	}
246	else
247	RTMemFree(pIoReq);
248	}
249
250	/**
251	* Record a successful write to the virtual disk.
252	*
253	* @returns VBox status code.
254	* @param pThis Disk integrity driver instance data.
255	* @param paSeg Segment array of the write to record.
256	* @param cSeg Number of segments.
257	* @param off Start offset.
258	* @param cbWrite Number of bytes to record.
259	*/
260	static int drvdiskintWriteRecord(PDRVDISKINTEGRITY pThis, PCRTSGSEG paSeg, unsigned cSeg,
261	uint64_t off, size_t cbWrite)
262	{
263	int rc = VINF_SUCCESS;
264
265	LogFlowFunc(("pThis=%#p paSeg=%#p cSeg=%u off=%llx cbWrite=%u\n",
266	pThis, paSeg, cSeg, off, cbWrite));
267
268	/* Update the segments */
269	size_t cbLeft = cbWrite;
270	RTFOFF offCurr = (RTFOFF)off;
271	RTSGBUF SgBuf;
272	PIOLOGENT pIoLogEnt = (PIOLOGENT)RTMemAllocZ(sizeof(IOLOGENT));
273	if (!pIoLogEnt)
274	return VERR_NO_MEMORY;
275
276	pIoLogEnt->off = off;
277	pIoLogEnt->cbWrite = cbWrite;
278	pIoLogEnt->cRefs = 0;
279
280	RTSgBufInit(&SgBuf, paSeg, cSeg);
281
282	while (cbLeft)
283	{
284	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr);
285	size_t cbRange = 0;
286	bool fSet = false;
287	unsigned offSeg = 0;
288
289	if (!pSeg)
290	{
291	/* Get next segment */
292	pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true);
293	if ( !pSeg
294	\|\| offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key)
295	cbRange = cbLeft;
296	else
297	cbRange = pSeg->Core.Key - offCurr;
298
299	Assert(cbRange % 512 == 0);
300
301	/* Create new segment */
302	pSeg = (PDRVDISKSEGMENT)RTMemAllocZ(RT_OFFSETOF(DRVDISKSEGMENT, apIoLog[cbRange / 512]));
303	if (pSeg)
304	{
305	pSeg->Core.Key = offCurr;
306	pSeg->Core.KeyLast = offCurr + (RTFOFF)cbRange - 1;
307	pSeg->cbSeg = cbRange;
308	pSeg->pbSeg = (uint8_t *)RTMemAllocZ(cbRange);
309	pSeg->cIoLogEntries = cbRange / 512;
310	if (!pSeg->pbSeg)
311	RTMemFree(pSeg);
312	else
313	{
314	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core);
315	AssertMsg(fInserted, ("Bug!\n"));
316	fSet = true;
317	}
318	}
319	}
320	else
321	{
322	fSet = true;
323	offSeg = offCurr - pSeg->Core.Key;
324	cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr));
325	}
326
327	if (fSet)
328	{
329	AssertPtr(pSeg);
330	size_t cbCopied = RTSgBufCopyToBuf(&SgBuf, pSeg->pbSeg + offSeg, cbRange);
331	Assert(cbCopied == cbRange);
332
333	/* Update the I/O log pointers */
334	Assert(offSeg % 512 == 0);
335	Assert(cbRange % 512 == 0);
336	while (offSeg < cbRange)
337	{
338	uint32_t uSector = offSeg / 512;
339	PIOLOGENT pIoLogOld = NULL;
340
341	AssertMsg(uSector < pSeg->cIoLogEntries, ("Internal bug!\n"));
342
343	pIoLogOld = pSeg->apIoLog[uSector];
344	if (pIoLogOld)
345	{
346	pIoLogOld->cRefs--;
347	if (!pIoLogOld->cRefs)
348	RTMemFree(pIoLogOld);
349	}
350
351	pSeg->apIoLog[uSector] = pIoLogEnt;
352	pIoLogEnt->cRefs++;
353
354	offSeg += 512;
355	}
356	}
357	else
358	RTSgBufAdvance(&SgBuf, cbRange);
359
360	offCurr += cbRange;
361	cbLeft -= cbRange;
362	}
363
364	return rc;
365	}
366
367	/**
368	* Verifies a read request.
369	*
370	* @returns VBox status code.
371	* @param pThis Disk integrity driver instance data.
372	* @param paSeg Segment array of the containing the data buffers to verify.
373	* @param cSeg Number of segments.
374	* @param off Start offset.
375	* @param cbWrite Number of bytes to verify.
376	*/
377	static int drvdiskintReadVerify(PDRVDISKINTEGRITY pThis, PCRTSGSEG paSeg, unsigned cSeg,
378	uint64_t off, size_t cbRead)
379	{
380	int rc = VINF_SUCCESS;
381
382	LogFlowFunc(("pThis=%#p paSeg=%#p cSeg=%u off=%llx cbRead=%u\n",
383	pThis, paSeg, cSeg, off, cbRead));
384
385	Assert(off % 512 == 0);
386	Assert(cbRead % 512 == 0);
387
388	/* Compare read data */
389	size_t cbLeft = cbRead;
390	RTFOFF offCurr = (RTFOFF)off;
391	RTSGBUF SgBuf;
392
393	RTSgBufInit(&SgBuf, paSeg, cSeg);
394
395	while (cbLeft)
396	{
397	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr);
398	size_t cbRange = 0;
399	bool fCmp = false;
400	unsigned offSeg = 0;
401
402	if (!pSeg)
403	{
404	/* Get next segment */
405	pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true);
406	if (!pSeg)
407	{
408	/* No data in the tree for this read. Assume everything is ok. */
409	cbRange = cbLeft;
410	}
411	else if (offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key)
412	cbRange = cbLeft;
413	else
414	cbRange = pSeg->Core.Key - offCurr;
415	}
416	else
417	{
418	fCmp = true;
419	offSeg = offCurr - pSeg->Core.Key;
420	cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr));
421	}
422
423	if (fCmp)
424	{
425	RTSGSEG Seg;
426	RTSGBUF SgBufCmp;
427	size_t cbOff = 0;
428
429	Seg.cbSeg = cbRange;
430	Seg.pvSeg = pSeg->pbSeg + offSeg;
431
432	RTSgBufInit(&SgBufCmp, &Seg, 1);
433	if (RTSgBufCmpEx(&SgBuf, &SgBufCmp, cbRange, &cbOff, true))
434	{
435	/* Corrupted disk, print I/O log entry of the last write which accessed this range. */
436	uint32_t cSector = (offSeg + cbOff) / 512;
437	AssertMsg(cSector < pSeg->cIoLogEntries, ("Internal bug!\n"));
438
439	RTMsgError("Corrupted disk at offset %llu (%u bytes in the current read buffer)!\n",
440	offCurr + cbOff, cbOff);
441	RTMsgError("Last write to this sector started at offset %llu with %u bytes (%u references to this log entry)\n",
442	pSeg->apIoLog[cSector]->off,
443	pSeg->apIoLog[cSector]->cbWrite,
444	pSeg->apIoLog[cSector]->cRefs);
445	RTAssertDebugBreak();
446	}
447	}
448	else
449	RTSgBufAdvance(&SgBuf, cbRange);
450
451	offCurr += cbRange;
452	cbLeft -= cbRange;
453	}
454
455	return rc;
456	}
457
458	/**
459	* Adds a request to the active list.
460	*
461	* @returns nothing.
462	* @param pThis The driver instance data.
463	* @param pIoReq The request to add.
464	*/
465	static void drvdiskintIoReqAdd(PDRVDISKINTEGRITY pThis, PDRVDISKAIOREQ pIoReq)
466	{
467	PDRVDISKAIOREQACTIVE pReqActive = &pThis->apReqActive[pThis->iNextFreeSlot];
468
469	Assert(!pReqActive->pIoReq);
470	pReqActive->tsStart = pIoReq->tsStart;
471	pReqActive->pIoReq = pIoReq;
472	pIoReq->iSlot = pThis->iNextFreeSlot;
473
474	/* Search for the next one. */
475	while (pThis->apReqActive[pThis->iNextFreeSlot].pIoReq)
476	pThis->iNextFreeSlot = (pThis->iNextFreeSlot+1) % RT_ELEMENTS(pThis->apReqActive);
477	}
478
479	/**
480	* Removes a request from the active list.
481	*
482	* @returns nothing.
483	* @param pThis The driver instance data.
484	* @param pIoReq The request to remove.
485	*/
486	static void drvdiskintIoReqRemove(PDRVDISKINTEGRITY pThis, PDRVDISKAIOREQ pIoReq)
487	{
488	PDRVDISKAIOREQACTIVE pReqActive = &pThis->apReqActive[pIoReq->iSlot];
489
490	Assert(pReqActive->pIoReq == pIoReq);
491
492	ASMAtomicWriteNullPtr(&pReqActive->pIoReq);
493	}
494
495	/**
496	* Thread checking for expired requests.
497	*
498	* @returns IPRT status code.
499	* @param pThread Thread handle.
500	* @param pvUser Opaque user data.
501	*/
502	static int drvdiskIntIoReqExpiredCheck(RTTHREAD pThread, void *pvUser)
503	{
504	PDRVDISKINTEGRITY pThis = (PDRVDISKINTEGRITY)pvUser;
505
506	while (pThis->fRunning)
507	{
508	int rc = RTSemEventWait(pThis->SemEvent, pThis->uCheckIntervalMs);
509
510	if (!pThis->fRunning)
511	break;
512
513	Assert(rc == VERR_TIMEOUT);
514
515	/* Get current timestamp for comparison. */
516	uint64_t tsCurr = RTTimeSystemMilliTS();
517
518	/* Go through the array and check for expired requests. */
519	for (unsigned i = 0; i < RT_ELEMENTS(pThis->apReqActive); i++)
520	{
521	PDRVDISKAIOREQACTIVE pReqActive = &pThis->apReqActive[i];
522	PDRVDISKAIOREQ pIoReq = ASMAtomicReadPtrT(&pReqActive->pIoReq, PDRVDISKAIOREQ);
523
524	if ( pIoReq
525	&& (tsCurr > pReqActive->tsStart)
526	&& (tsCurr - pReqActive->tsStart) >= pThis->uExpireIntervalMs)
527	{
528	RTMsgError("Request %#p expired (active for %llu ms already)\n",
529	pIoReq, tsCurr - pReqActive->tsStart);
530	RTAssertDebugBreak();
531	}
532	}
533	}
534
535	return VINF_SUCCESS;
536	}
537
538	/* -=-=-=-=- IMedia -=-=-=-=- */
539
540	/** Makes a PDRVDISKINTEGRITY out of a PPDMIMEDIA. */
541	#define PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface) ( (PDRVDISKINTEGRITY)((uintptr_t)pInterface - RT_OFFSETOF(DRVDISKINTEGRITY, IMedia)) )
542	/** Makes a PDRVDISKINTEGRITY out of a PPDMIMEDIAASYNC. */
543	#define PDMIMEDIAASYNC_2_DRVDISKINTEGRITY(pInterface) ( (PDRVDISKINTEGRITY)((uintptr_t)pInterface - RT_OFFSETOF(DRVDISKINTEGRITY, IMediaAsync)) )
544
545	/*******************************************************************************
546	* Media interface methods *
547	*******************************************************************************/
548
549	/** @copydoc PDMIMEDIA::pfnRead */
550	static DECLCALLBACK(int) drvdiskintRead(PPDMIMEDIA pInterface,
551	uint64_t off, void *pvBuf, size_t cbRead)
552	{
553	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
554	int rc = pThis->pDrvMedia->pfnRead(pThis->pDrvMedia, off, pvBuf, cbRead);
555	if (RT_FAILURE(rc))
556	return rc;
557
558	if (pThis->fCheckConsistency)
559	{
560	/* Verify the read. */
561	RTSGSEG Seg;
562	Seg.cbSeg = cbRead;
563	Seg.pvSeg = pvBuf;
564	rc = drvdiskintReadVerify(pThis, &Seg, 1, off, cbRead);
565	}
566
567	return rc;
568	}
569
570	/** @copydoc PDMIMEDIA::pfnWrite */
571	static DECLCALLBACK(int) drvdiskintWrite(PPDMIMEDIA pInterface,
572	uint64_t off, const void *pvBuf,
573	size_t cbWrite)
574	{
575	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
576	int rc = pThis->pDrvMedia->pfnWrite(pThis->pDrvMedia, off, pvBuf, cbWrite);
577	if (RT_FAILURE(rc))
578	return rc;
579
580	if (pThis->fCheckConsistency)
581	{
582	/* Record the write. */
583	RTSGSEG Seg;
584	Seg.cbSeg = cbWrite;
585	Seg.pvSeg = (void *)pvBuf;
586	rc = drvdiskintWriteRecord(pThis, &Seg, 1, off, cbWrite);
587	}
588
589	return rc;
590	}
591
592	static DECLCALLBACK(int) drvdiskintStartRead(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
593	PCRTSGSEG paSeg, unsigned cSeg,
594	size_t cbRead, void *pvUser)
595	{
596	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbRead=%d pvUser=%#p\n", __FUNCTION__,
597	uOffset, paSeg, cSeg, cbRead, pvUser));
598	PDRVDISKINTEGRITY pThis = PDMIMEDIAASYNC_2_DRVDISKINTEGRITY(pInterface);
599	PDRVDISKAIOREQ pIoReq = drvdiskintIoReqAlloc(DRVDISKAIOTXDIR_READ, uOffset, paSeg, cSeg, cbRead, pvUser);
600	AssertPtr(pIoReq);
601
602	if (pThis->fTraceRequests)
603	drvdiskintIoReqAdd(pThis, pIoReq);
604
605	int rc = pThis->pDrvMediaAsync->pfnStartRead(pThis->pDrvMediaAsync, uOffset, paSeg, cSeg,
606	cbRead, pIoReq);
607	if (rc == VINF_VD_ASYNC_IO_FINISHED)
608	{
609	/* Verify the read now. */
610	if (pThis->fCheckConsistency)
611	{
612	int rc2 = drvdiskintReadVerify(pThis, paSeg, cSeg, uOffset, cbRead);
613	AssertRC(rc2);
614	}
615
616	if (pThis->fTraceRequests)
617	drvdiskintIoReqRemove(pThis, pIoReq);
618	RTMemFree(pIoReq);
619	}
620	else if (RT_FAILURE(rc) && rc != VERR_VD_ASYNC_IO_IN_PROGRESS)
621	RTMemFree(pIoReq);
622
623	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
624	return rc;
625	}
626
627	static DECLCALLBACK(int) drvdiskintStartWrite(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
628	PCRTSGSEG paSeg, unsigned cSeg,
629	size_t cbWrite, void *pvUser)
630	{
631	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbWrite=%d pvUser=%#p\n", __FUNCTION__,
632	uOffset, paSeg, cSeg, cbWrite, pvUser));
633	PDRVDISKINTEGRITY pThis = PDMIMEDIAASYNC_2_DRVDISKINTEGRITY(pInterface);
634	PDRVDISKAIOREQ pIoReq = drvdiskintIoReqAlloc(DRVDISKAIOTXDIR_WRITE, uOffset, paSeg, cSeg, cbWrite, pvUser);
635	AssertPtr(pIoReq);
636
637	if (pThis->fTraceRequests)
638	drvdiskintIoReqAdd(pThis, pIoReq);
639
640	int rc = pThis->pDrvMediaAsync->pfnStartWrite(pThis->pDrvMediaAsync, uOffset, paSeg, cSeg,
641	cbWrite, pIoReq);
642	if (rc == VINF_VD_ASYNC_IO_FINISHED)
643	{
644	/* Verify the read now. */
645	if (pThis->fCheckConsistency)
646	{
647	int rc2 = drvdiskintWriteRecord(pThis, paSeg, cSeg, uOffset, cbWrite);
648	AssertRC(rc2);
649	}
650
651	if (pThis->fTraceRequests)
652	drvdiskintIoReqRemove(pThis, pIoReq);
653
654	RTMemFree(pIoReq);
655	}
656	else if (RT_FAILURE(rc) && rc != VERR_VD_ASYNC_IO_IN_PROGRESS)
657	RTMemFree(pIoReq);
658
659	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
660	return rc;
661	}
662
663	/** @copydoc PDMIMEDIAASYNC::pfnStartFlush */
664	static DECLCALLBACK(int) drvdiskintStartFlush(PPDMIMEDIAASYNC pInterface, void *pvUser)
665	{
666	PDRVDISKINTEGRITY pThis = PDMIMEDIAASYNC_2_DRVDISKINTEGRITY(pInterface);
667	PDRVDISKAIOREQ pIoReq = drvdiskintIoReqAlloc(DRVDISKAIOTXDIR_FLUSH, 0, NULL, 0, 0, pvUser);
668	AssertPtr(pIoReq);
669
670	return pThis->pDrvMediaAsync->pfnStartFlush(pThis->pDrvMediaAsync, pIoReq);
671	}
672
673	/** @copydoc PDMIMEDIA::pfnFlush */
674	static DECLCALLBACK(int) drvdiskintFlush(PPDMIMEDIA pInterface)
675	{
676	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
677	return pThis->pDrvMedia->pfnFlush(pThis->pDrvMedia);
678	}
679
680	/** @copydoc PDMIMEDIA::pfnGetSize */
681	static DECLCALLBACK(uint64_t) drvdiskintGetSize(PPDMIMEDIA pInterface)
682	{
683	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
684	return pThis->pDrvMedia->pfnGetSize(pThis->pDrvMedia);
685	}
686
687	/** @copydoc PDMIMEDIA::pfnIsReadOnly */
688	static DECLCALLBACK(bool) drvdiskintIsReadOnly(PPDMIMEDIA pInterface)
689	{
690	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
691	return pThis->pDrvMedia->pfnIsReadOnly(pThis->pDrvMedia);
692	}
693
694	/** @copydoc PDMIMEDIA::pfnBiosGetPCHSGeometry */
695	static DECLCALLBACK(int) drvdiskintBiosGetPCHSGeometry(PPDMIMEDIA pInterface,
696	PPDMMEDIAGEOMETRY pPCHSGeometry)
697	{
698	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
699	return pThis->pDrvMedia->pfnBiosGetPCHSGeometry(pThis->pDrvMedia, pPCHSGeometry);
700	}
701
702	/** @copydoc PDMIMEDIA::pfnBiosSetPCHSGeometry */
703	static DECLCALLBACK(int) drvdiskintBiosSetPCHSGeometry(PPDMIMEDIA pInterface,
704	PCPDMMEDIAGEOMETRY pPCHSGeometry)
705	{
706	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
707	return pThis->pDrvMedia->pfnBiosSetPCHSGeometry(pThis->pDrvMedia, pPCHSGeometry);
708	}
709
710	/** @copydoc PDMIMEDIA::pfnBiosGetLCHSGeometry */
711	static DECLCALLBACK(int) drvdiskintBiosGetLCHSGeometry(PPDMIMEDIA pInterface,
712	PPDMMEDIAGEOMETRY pLCHSGeometry)
713	{
714	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
715	return pThis->pDrvMedia->pfnBiosGetLCHSGeometry(pThis->pDrvMedia, pLCHSGeometry);
716	}
717
718	/** @copydoc PDMIMEDIA::pfnBiosSetLCHSGeometry */
719	static DECLCALLBACK(int) drvdiskintBiosSetLCHSGeometry(PPDMIMEDIA pInterface,
720	PCPDMMEDIAGEOMETRY pLCHSGeometry)
721	{
722	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
723	return pThis->pDrvMedia->pfnBiosSetLCHSGeometry(pThis->pDrvMedia, pLCHSGeometry);
724	}
725
726	/** @copydoc PDMIMEDIA::pfnGetUuid */
727	static DECLCALLBACK(int) drvdiskintGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid)
728	{
729	PDRVDISKINTEGRITY pThis = PDMIMEDIA_2_DRVDISKINTEGRITY(pInterface);
730	return pThis->pDrvMedia->pfnGetUuid(pThis->pDrvMedia, pUuid);
731	}
732
733	/* -=-=-=-=- IMediaAsyncPort -=-=-=-=- */
734
735	/** Makes a PDRVBLOCKASYNC out of a PPDMIMEDIAASYNCPORT. */
736	#define PDMIMEDIAASYNCPORT_2_DRVDISKINTEGRITY(pInterface) ( (PDRVDISKINTEGRITY((uintptr_t)pInterface - RT_OFFSETOF(DRVDISKINTEGRITY, IMediaAsyncPort))) )
737
738	static DECLCALLBACK(int) drvdiskintAsyncTransferCompleteNotify(PPDMIMEDIAASYNCPORT pInterface, void *pvUser, int rcReq)
739	{
740	PDRVDISKINTEGRITY pThis = PDMIMEDIAASYNCPORT_2_DRVDISKINTEGRITY(pInterface);
741	PDRVDISKAIOREQ pIoReq = (PDRVDISKAIOREQ)pvUser;
742	int rc = VINF_SUCCESS;
743
744	LogFlowFunc(("pIoReq=%#p\n", pIoReq));
745
746	/* Remove from the active list. */
747	if (pThis->fTraceRequests)
748	drvdiskintIoReqRemove(pThis, pIoReq);
749
750	if (RT_SUCCESS(rcReq) && pThis->fCheckConsistency)
751	{
752	if (pIoReq->enmTxDir == DRVDISKAIOTXDIR_READ)
753	rc = drvdiskintReadVerify(pThis, pIoReq->paSeg, pIoReq->cSeg, pIoReq->off, pIoReq->cbTransfer);
754	else if (pIoReq->enmTxDir == DRVDISKAIOTXDIR_WRITE)
755	rc = drvdiskintWriteRecord(pThis, pIoReq->paSeg, pIoReq->cSeg, pIoReq->off, pIoReq->cbTransfer);
756	else
757	AssertMsg(pIoReq->enmTxDir == DRVDISKAIOTXDIR_FLUSH, ("Huh?\n"));
758
759	AssertRC(rc);
760	}
761
762	void *pvUserComplete = pIoReq->pvUser;
763
764	drvdiskintIoReqFree(pThis, pIoReq);
765
766	rc = pThis->pDrvMediaAsyncPort->pfnTransferCompleteNotify(pThis->pDrvMediaAsyncPort, pvUserComplete, rcReq);
767
768	return rc;
769	}
770
771	/* -=-=-=-=- IBase -=-=-=-=- */
772
773	/**
774	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
775	*/
776	static DECLCALLBACK(void ) drvdiskintQueryInterface(PPDMIBASE pInterface, const char pszIID)
777	{
778	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
779	PDRVDISKINTEGRITY pThis = PDMINS_2_DATA(pDrvIns, PDRVDISKINTEGRITY);
780
781	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
782	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIA, &pThis->IMedia);
783	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAASYNC, pThis->pDrvMediaAsync ? &pThis->IMediaAsync : NULL);
784	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAASYNCPORT, &pThis->IMediaAsyncPort);
785	return NULL;
786	}
787
788
789	/* -=-=-=-=- driver interface -=-=-=-=- */
790
791	static int drvdiskintTreeDestroy(PAVLRFOFFNODECORE pNode, void *pvUser)
792	{
793	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)pNode;
794
795	RTMemFree(pSeg->pbSeg);
796	RTMemFree(pSeg);
797	return VINF_SUCCESS;
798	}
799
800	/**
801	* @copydoc FNPDMDRVDESTRUCT
802	*/
803	static DECLCALLBACK(void) drvdiskintDestruct(PPDMDRVINS pDrvIns)
804	{
805	PDRVDISKINTEGRITY pThis = PDMINS_2_DATA(pDrvIns, PDRVDISKINTEGRITY);
806
807	if (pThis->pTreeSegments)
808	{
809	RTAvlrFileOffsetDestroy(pThis->pTreeSegments, drvdiskintTreeDestroy, NULL);
810	RTMemFree(pThis->pTreeSegments);
811	}
812
813	if (pThis->fTraceRequests)
814	{
815	pThis->fRunning = false;
816	RTSemEventSignal(pThis->SemEvent);
817	RTSemEventDestroy(pThis->SemEvent);
818	}
819
820	if (pThis->fCheckDoubleCompletion)
821	{
822	/* Free all requests */
823	while (pThis->papIoReq[pThis->iEntry])
824	{
825	RTMemFree(pThis->papIoReq[pThis->iEntry]);
826	pThis->papIoReq[pThis->iEntry] = NULL;
827	pThis->iEntry = (pThis->iEntry+1) % pThis->cEntries;
828	}
829	}
830	}
831
832	/**
833	* Construct a disk integrity driver instance.
834	*
835	* @copydoc FNPDMDRVCONSTRUCT
836	*/
837	static DECLCALLBACK(int) drvdiskintConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
838	{
839	int rc = VINF_SUCCESS;
840	PDRVDISKINTEGRITY pThis = PDMINS_2_DATA(pDrvIns, PDRVDISKINTEGRITY);
841	LogFlow(("drvdiskintConstruct: iInstance=%d\n", pDrvIns->iInstance));
842	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
843
844	/*
845	* Validate configuration.
846	*/
847	if (!CFGMR3AreValuesValid(pCfg, "CheckConsistency\0"
848	"TraceRequests\0"
849	"CheckIntervalMs\0"
850	"ExpireIntervalMs\0"
851	"CheckDoubleCompletions\0"
852	"HistorySize\0"))
853	return VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES;
854
855	rc = CFGMR3QueryBoolDef(pCfg, "CheckConsistency", &pThis->fCheckConsistency, false);
856	AssertRC(rc);
857	rc = CFGMR3QueryBoolDef(pCfg, "TraceRequests", &pThis->fTraceRequests, false);
858	AssertRC(rc);
859	rc = CFGMR3QueryU32Def(pCfg, "CheckIntervalMs", &pThis->uCheckIntervalMs, 5000); /* 5 seconds */
860	AssertRC(rc);
861	rc = CFGMR3QueryU32Def(pCfg, "ExpireIntervalMs", &pThis->uExpireIntervalMs, 20000); /* 20 seconds */
862	AssertRC(rc);
863	rc = CFGMR3QueryBoolDef(pCfg, "CheckDoubleCompletions", &pThis->fCheckDoubleCompletion, false);
864	AssertRC(rc);
865	rc = CFGMR3QueryU32Def(pCfg, "HistorySize", &pThis->cEntries, 512);
866	AssertRC(rc);
867
868	/*
869	* Initialize most of the data members.
870	*/
871	pThis->pDrvIns = pDrvIns;
872
873	/* IBase. */
874	pDrvIns->IBase.pfnQueryInterface = drvdiskintQueryInterface;
875
876	/* IMedia */
877	pThis->IMedia.pfnRead = drvdiskintRead;
878	pThis->IMedia.pfnWrite = drvdiskintWrite;
879	pThis->IMedia.pfnFlush = drvdiskintFlush;
880	pThis->IMedia.pfnGetSize = drvdiskintGetSize;
881	pThis->IMedia.pfnIsReadOnly = drvdiskintIsReadOnly;
882	pThis->IMedia.pfnBiosGetPCHSGeometry = drvdiskintBiosGetPCHSGeometry;
883	pThis->IMedia.pfnBiosSetPCHSGeometry = drvdiskintBiosSetPCHSGeometry;
884	pThis->IMedia.pfnBiosGetLCHSGeometry = drvdiskintBiosGetLCHSGeometry;
885	pThis->IMedia.pfnBiosSetLCHSGeometry = drvdiskintBiosSetLCHSGeometry;
886	pThis->IMedia.pfnGetUuid = drvdiskintGetUuid;
887
888	/* IMediaAsync */
889	pThis->IMediaAsync.pfnStartRead = drvdiskintStartRead;
890	pThis->IMediaAsync.pfnStartWrite = drvdiskintStartWrite;
891	pThis->IMediaAsync.pfnStartFlush = drvdiskintStartFlush;
892
893	/* IMediaAsyncPort. */
894	pThis->IMediaAsyncPort.pfnTransferCompleteNotify = drvdiskintAsyncTransferCompleteNotify;
895
896	/*
897	* Try attach driver below and query it's media interface.
898	*/
899	PPDMIBASE pBase;
900	rc = PDMDrvHlpAttach(pDrvIns, fFlags, &pBase);
901	if (RT_FAILURE(rc))
902	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
903	N_("Failed to attach driver below us! %Rrc"), rc);
904
905	pThis->pDrvMedia = PDMIBASE_QUERY_INTERFACE(pBase, PDMIMEDIA);
906	if (!pThis->pDrvMedia)
907	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_BELOW,
908	N_("No media or async media interface below"));
909
910	pThis->pDrvMediaAsync = PDMIBASE_QUERY_INTERFACE(pBase, PDMIMEDIAASYNC);
911
912	/* Try to attach async media port interface above.*/
913	pThis->pDrvMediaAsyncPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAASYNCPORT);
914
915	if (pThis->fCheckConsistency)
916	{
917	/* Create the AVL tree. */
918	pThis->pTreeSegments = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE));
919	if (!pThis->pTreeSegments)
920	rc = VERR_NO_MEMORY;
921	}
922
923	if (pThis->fTraceRequests)
924	{
925	for (unsigned i = 0; i < RT_ELEMENTS(pThis->apReqActive); i++)
926	{
927	pThis->apReqActive[i].pIoReq = NULL;
928	pThis->apReqActive[i].tsStart = 0;
929	}
930
931	pThis->iNextFreeSlot = 0;
932
933	/* Init event semaphore. */
934	rc = RTSemEventCreate(&pThis->SemEvent);
935	AssertRC(rc);
936	pThis->fRunning = true;
937	rc = RTThreadCreate(&pThis->hThread, drvdiskIntIoReqExpiredCheck, pThis,
938	0, RTTHREADTYPE_INFREQUENT_POLLER, 0, "DiskIntegrity");
939	AssertRC(rc);
940	}
941
942	if (pThis->fCheckDoubleCompletion)
943	{
944	pThis->iEntry = 0;
945	pThis->papIoReq = (PDRVDISKAIOREQ )RTMemAllocZ(pThis->cEntries sizeof(PDRVDISKAIOREQ));
946	AssertPtr(pThis->papIoReq);
947	}
948
949	return rc;
950	}
951
952
953	/**
954	* Block driver registration record.
955	*/
956	const PDMDRVREG g_DrvDiskIntegrity =
957	{
958	/* u32Version */
959	PDM_DRVREG_VERSION,
960	/* szName */
961	"DiskIntegrity",
962	/* szRCMod */
963	"",
964	/* szR0Mod */
965	"",
966	/* pszDescription */
967	"Disk integrity driver.",
968	/* fFlags */
969	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
970	/* fClass. */
971	PDM_DRVREG_CLASS_BLOCK,
972	/* cMaxInstances */
973	~0,
974	/* cbInstance */
975	sizeof(DRVDISKINTEGRITY),
976	/* pfnConstruct */
977	drvdiskintConstruct,
978	/* pfnDestruct */
979	drvdiskintDestruct,
980	/* pfnRelocate */
981	NULL,
982	/* pfnIOCtl */
983	NULL,
984	/* pfnPowerOn */
985	NULL,
986	/* pfnReset */
987	NULL,
988	/* pfnSuspend */
989	NULL,
990	/* pfnResume */
991	NULL,
992	/* pfnAttach */
993	NULL,
994	/* pfnDetach */
995	NULL,
996	/* pfnPowerOff */
997	NULL,
998	/* pfnSoftReset */
999	NULL,
1000	/* u32EndVersion */
1001	PDM_DRVREG_VERSION
1002	};
1003

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source: vbox/trunk/src/VBox/Devices/Storage/DrvDiskIntegrity.cpp@ 33400

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