DrvRamDisk.cpp@ 78272

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1	/* $Id: DrvRamDisk.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* VBox storage devices: RAM disk driver.
4	*/
5
6	/*
7	* Copyright (C) 2016-2019 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/vmm/pdmdrv.h>
24	#include <VBox/vmm/pdmstorageifs.h>
25	#include <iprt/assert.h>
26	#include <iprt/string.h>
27	#include <iprt/uuid.h>
28	#include <iprt/avl.h>
29	#include <iprt/list.h>
30	#include <iprt/mem.h>
31	#include <iprt/memcache.h>
32	#include <iprt/message.h>
33	#include <iprt/sg.h>
34	#include <iprt/time.h>
35	#include <iprt/semaphore.h>
36	#include <iprt/asm.h>
37	#include <iprt/req.h>
38	#include <iprt/thread.h>
39
40	#include "VBoxDD.h"
41	#include "IOBufMgmt.h"
42
43
44	/*********************************************************************************************************************************
45	* Structures and Typedefs *
46	*********************************************************************************************************************************/
47
48	/** Pointer to a ramdisk driver instance. */
49	typedef struct DRVRAMDISK *PDRVRAMDISK;
50
51	/**
52	* Disk segment.
53	*/
54	typedef struct DRVDISKSEGMENT
55	{
56	/** AVL core. */
57	AVLRFOFFNODECORE Core;
58	/** Size of the segment */
59	size_t cbSeg;
60	/** Data for this segment */
61	uint8_t *pbSeg;
62	} DRVDISKSEGMENT, *PDRVDISKSEGMENT;
63
64	/**
65	* VD I/O request state.
66	*/
67	typedef enum VDIOREQSTATE
68	{
69	/** Invalid. */
70	VDIOREQSTATE_INVALID = 0,
71	/** The request is not in use and resides on the free list. */
72	VDIOREQSTATE_FREE,
73	/** The request was just allocated and is not active. */
74	VDIOREQSTATE_ALLOCATED,
75	/** The request was allocated and is in use. */
76	VDIOREQSTATE_ACTIVE,
77	/** The request was suspended and is not actively processed. */
78	VDIOREQSTATE_SUSPENDED,
79	/** The request is in the last step of completion and syncs memory. */
80	VDIOREQSTATE_COMPLETING,
81	/** The request completed. */
82	VDIOREQSTATE_COMPLETED,
83	/** The request was aborted but wasn't returned as complete from the storage
84	* layer below us. */
85	VDIOREQSTATE_CANCELED,
86	/** 32bit hack. */
87	VDIOREQSTATE_32BIT_HACK = 0x7fffffff
88	} VDIOREQSTATE;
89
90	/**
91	* VD I/O Request.
92	*/
93	typedef struct PDMMEDIAEXIOREQINT
94	{
95	/** List node for the list of allocated requests. */
96	RTLISTNODE NdAllocatedList;
97	/** List for requests waiting for I/O memory or on the redo list. */
98	RTLISTNODE NdLstWait;
99	/** I/O request type. */
100	PDMMEDIAEXIOREQTYPE enmType;
101	/** Request state. */
102	volatile VDIOREQSTATE enmState;
103	/** I/O request ID. */
104	PDMMEDIAEXIOREQID uIoReqId;
105	/** Pointer to the disk container. */
106	PDRVRAMDISK pDisk;
107	/** Flags. */
108	uint32_t fFlags;
109	/** Timestamp when the request was submitted. */
110	uint64_t tsSubmit;
111	/** Type dependent data. */
112	union
113	{
114	/** Read/Write request sepcific data. */
115	struct
116	{
117	/** Start offset of the request. */
118	uint64_t offStart;
119	/** Size of the request. */
120	size_t cbReq;
121	/** Size left for this request. */
122	size_t cbReqLeft;
123	/** Size of the allocated I/O buffer. */
124	size_t cbIoBuf;
125	/** I/O buffer descriptor. */
126	IOBUFDESC IoBuf;
127	} ReadWrite;
128	/** Discard specific data. */
129	struct
130	{
131	/** Pointer to array of ranges to discard. */
132	PRTRANGE paRanges;
133	/** Number of ranges to discard. */
134	unsigned cRanges;
135	} Discard;
136	};
137	/** Allocator specific memory - variable size. */
138	uint8_t abAlloc[1];
139	} PDMMEDIAEXIOREQINT;
140	/** Pointer to a VD I/O request. */
141	typedef PDMMEDIAEXIOREQINT *PPDMMEDIAEXIOREQINT;
142
143	/**
144	* Structure for holding a list of allocated requests.
145	*/
146	typedef struct VDLSTIOREQALLOC
147	{
148	/** Mutex protecting the table of allocated requests. */
149	RTSEMFASTMUTEX hMtxLstIoReqAlloc;
150	/** List anchor. */
151	RTLISTANCHOR LstIoReqAlloc;
152	} VDLSTIOREQALLOC;
153	typedef VDLSTIOREQALLOC *PVDLSTIOREQALLOC;
154
155	/** Number of bins for allocated requests. */
156	#define DRVVD_VDIOREQ_ALLOC_BINS 8
157
158	/**
159	* Disk integrity driver instance data.
160	*
161	* @implements PDMIMEDIA
162	*/
163	typedef struct DRVRAMDISK
164	{
165	/** Pointer driver instance. */
166	PPDMDRVINS pDrvIns;
167	/** Pointer to the media driver below us.
168	* This is NULL if the media is not mounted. */
169	PPDMIMEDIA pDrvMedia;
170	/** Our media interface */
171	PDMIMEDIA IMedia;
172
173	/** The media port interface above. */
174	PPDMIMEDIAPORT pDrvMediaPort;
175	/** Media port interface */
176	PDMIMEDIAPORT IMediaPort;
177
178	/** Flag whether the RAM disk was pre allocated. */
179	bool fPreallocRamDisk;
180	/** Flag whether to report a non totating medium. */
181	bool fNonRotational;
182	/** AVL tree containing the disk blocks to check. */
183	PAVLRFOFFTREE pTreeSegments;
184	/** Size of the disk. */
185	uint64_t cbDisk;
186	/** Size of one sector. */
187	uint32_t cbSector;
188
189	/** Worker request queue. */
190	RTREQQUEUE hReqQ;
191	/** Worker thread for async requests. */
192	RTTHREAD hThrdWrk;
193
194	/** @name IMEDIAEX interface support specific members.
195	* @{ */
196	/** Pointer to the IMEDIAEXPORT interface above us. */
197	PPDMIMEDIAEXPORT pDrvMediaExPort;
198	/** Our extended media interface. */
199	PDMIMEDIAEX IMediaEx;
200	/** Memory cache for the I/O requests. */
201	RTMEMCACHE hIoReqCache;
202	/** I/O buffer manager. */
203	IOBUFMGR hIoBufMgr;
204	/** Active request counter. */
205	volatile uint32_t cIoReqsActive;
206	/** Bins for allocated requests. */
207	VDLSTIOREQALLOC aIoReqAllocBins[DRVVD_VDIOREQ_ALLOC_BINS];
208	/** List of requests for I/O memory to be available - VDIOREQ::NdLstWait. */
209	RTLISTANCHOR LstIoReqIoBufWait;
210	/** Critical section protecting the list of requests waiting for I/O memory. */
211	RTCRITSECT CritSectIoReqsIoBufWait;
212	/** Number of requests waiting for a I/O buffer. */
213	volatile uint32_t cIoReqsWaiting;
214	/** Flag whether we have to resubmit requests on resume because the
215	* VM was suspended due to a recoverable I/O error.
216	*/
217	volatile bool fRedo;
218	/** List of requests we have to redo. */
219	RTLISTANCHOR LstIoReqRedo;
220	/** Criticial section protecting the list of waiting requests. */
221	RTCRITSECT CritSectIoReqRedo;
222	/** Number of errors logged so far. */
223	unsigned cErrors;
224	/** @} */
225
226	} DRVRAMDISK;
227
228
229	static void drvramdiskMediaExIoReqComplete(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq,
230	int rcReq);
231
232	/**
233	* Record a successful write to the virtual disk.
234	*
235	* @returns VBox status code.
236	* @param pThis Disk integrity driver instance data.
237	* @param pSgBuf The S/G buffer holding the data to write.
238	* @param off Start offset.
239	* @param cbWrite Number of bytes to record.
240	*/
241	static int drvramdiskWriteWorker(PDRVRAMDISK pThis, PRTSGBUF pSgBuf,
242	uint64_t off, size_t cbWrite)
243	{
244	int rc = VINF_SUCCESS;
245
246	LogFlowFunc(("pThis=%#p pSgBuf=%#p off=%llx cbWrite=%u\n",
247	pThis, pSgBuf, off, cbWrite));
248
249	/* Update the segments */
250	size_t cbLeft = cbWrite;
251	RTFOFF offCurr = (RTFOFF)off;
252
253	while (cbLeft)
254	{
255	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr);
256	size_t cbRange = 0;
257	bool fSet = false;
258	unsigned offSeg = 0;
259
260	if (!pSeg)
261	{
262	/* Get next segment */
263	pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true);
264	if ( !pSeg
265	\|\| offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key)
266	cbRange = cbLeft;
267	else
268	cbRange = pSeg->Core.Key - offCurr;
269
270	Assert(cbRange % 512 == 0);
271
272	/* Create new segment */
273	pSeg = (PDRVDISKSEGMENT)RTMemAllocZ(sizeof(DRVDISKSEGMENT));
274	if (pSeg)
275	{
276	pSeg->Core.Key = offCurr;
277	pSeg->Core.KeyLast = offCurr + (RTFOFF)cbRange - 1;
278	pSeg->cbSeg = cbRange;
279	pSeg->pbSeg = (uint8_t *)RTMemAllocZ(cbRange);
280	if (!pSeg->pbSeg)
281	RTMemFree(pSeg);
282	else
283	{
284	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core);
285	AssertMsg(fInserted, ("Bug!\n")); RT_NOREF(fInserted);
286	fSet = true;
287	}
288	}
289	}
290	else
291	{
292	fSet = true;
293	offSeg = offCurr - pSeg->Core.Key;
294	cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr));
295	}
296
297	if (fSet)
298	{
299	AssertPtr(pSeg);
300	size_t cbCopied = RTSgBufCopyToBuf(pSgBuf, pSeg->pbSeg + offSeg, cbRange);
301	Assert(cbCopied == cbRange); RT_NOREF(cbCopied);
302	}
303	else
304	RTSgBufAdvance(pSgBuf, cbRange);
305
306	offCurr += cbRange;
307	cbLeft -= cbRange;
308	}
309
310	return rc;
311	}
312
313	/**
314	* Read data from the ram disk.
315	*
316	* @returns VBox status code.
317	* @param pThis RAM disk driver instance data.
318	* @param pSgBuf The S/G buffer to store the data.
319	* @param off Start offset.
320	* @param cbRead Number of bytes to read.
321	*/
322	static int drvramdiskReadWorker(PDRVRAMDISK pThis, PRTSGBUF pSgBuf,
323	uint64_t off, size_t cbRead)
324	{
325	int rc = VINF_SUCCESS;
326
327	LogFlowFunc(("pThis=%#p pSgBuf=%#p off=%llx cbRead=%u\n",
328	pThis, pSgBuf, off, cbRead));
329
330	Assert(off % 512 == 0);
331	Assert(cbRead % 512 == 0);
332
333	/* Compare read data */
334	size_t cbLeft = cbRead;
335	RTFOFF offCurr = (RTFOFF)off;
336
337	while (cbLeft)
338	{
339	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr);
340	size_t cbRange = 0;
341	bool fCmp = false;
342	unsigned offSeg = 0;
343
344	if (!pSeg)
345	{
346	/* Get next segment */
347	pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true);
348	if ( !pSeg
349	\|\| offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key)
350	cbRange = cbLeft;
351	else
352	cbRange = pSeg->Core.Key - offCurr;
353
354	/* No segment means everything should be 0 for this part. */
355	RTSgBufSet(pSgBuf, 0, cbRange);
356	}
357	else
358	{
359	fCmp = true;
360	offSeg = offCurr - pSeg->Core.Key;
361	cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr));
362
363	RTSGSEG Seg;
364	RTSGBUF SgBufSrc;
365
366	Seg.cbSeg = cbRange;
367	Seg.pvSeg = pSeg->pbSeg + offSeg;
368
369	RTSgBufInit(&SgBufSrc, &Seg, 1);
370	RTSgBufCopy(pSgBuf, &SgBufSrc, cbRange);
371	}
372
373	offCurr += cbRange;
374	cbLeft -= cbRange;
375	}
376
377	return rc;
378	}
379
380	/**
381	* Discards the given ranges from the disk.
382	*
383	* @returns VBox status code.
384	* @param pThis Disk integrity driver instance data.
385	* @param paRanges Array of ranges to discard.
386	* @param cRanges Number of ranges in the array.
387	*/
388	static int drvramdiskDiscardRecords(PDRVRAMDISK pThis, PCRTRANGE paRanges, unsigned cRanges)
389	{
390	int rc = VINF_SUCCESS;
391
392	LogFlowFunc(("pThis=%#p paRanges=%#p cRanges=%u\n", pThis, paRanges, cRanges));
393
394	for (unsigned i = 0; i < cRanges; i++)
395	{
396	uint64_t offStart = paRanges[i].offStart;
397	size_t cbLeft = paRanges[i].cbRange;
398
399	LogFlowFunc(("Discarding off=%llu cbRange=%zu\n", offStart, cbLeft));
400
401	while (cbLeft)
402	{
403	size_t cbRange;
404	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offStart);
405
406	if (!pSeg)
407	{
408	/* Get next segment */
409	pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offStart, true);
410	if ( !pSeg
411	\|\| (RTFOFF)offStart + (RTFOFF)cbLeft <= pSeg->Core.Key)
412	cbRange = cbLeft;
413	else
414	cbRange = pSeg->Core.Key - offStart;
415
416	Assert(!(cbRange % 512));
417	}
418	else
419	{
420	size_t cbPreLeft, cbPostLeft;
421
422	cbRange = RT_MIN(cbLeft, pSeg->Core.KeyLast - offStart + 1);
423	cbPreLeft = offStart - pSeg->Core.Key;
424	cbPostLeft = pSeg->cbSeg - cbRange - cbPreLeft;
425
426	Assert(!(cbRange % 512));
427	Assert(!(cbPreLeft % 512));
428	Assert(!(cbPostLeft % 512));
429
430	LogFlowFunc(("cbRange=%zu cbPreLeft=%zu cbPostLeft=%zu\n",
431	cbRange, cbPreLeft, cbPostLeft));
432
433	RTAvlrFileOffsetRemove(pThis->pTreeSegments, pSeg->Core.Key);
434
435	if (!cbPreLeft && !cbPostLeft)
436	{
437	/* Just free the whole segment. */
438	LogFlowFunc(("Freeing whole segment pSeg=%#p\n", pSeg));
439	RTMemFree(pSeg->pbSeg);
440	RTMemFree(pSeg);
441	}
442	else if (cbPreLeft && !cbPostLeft)
443	{
444	/* Realloc to new size and insert. */
445	LogFlowFunc(("Realloc segment pSeg=%#p\n", pSeg));
446	pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPreLeft);
447	pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT));
448	pSeg->Core.KeyLast = pSeg->Core.Key + cbPreLeft - 1;
449	pSeg->cbSeg = cbPreLeft;
450	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core);
451	Assert(fInserted); RT_NOREF(fInserted);
452	}
453	else if (!cbPreLeft && cbPostLeft)
454	{
455	/* Move data to the front and realloc. */
456	LogFlowFunc(("Move data and realloc segment pSeg=%#p\n", pSeg));
457	memmove(pSeg->pbSeg, pSeg->pbSeg + cbRange, cbPostLeft);
458	pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT));
459	pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPostLeft);
460	pSeg->Core.Key += cbRange;
461	pSeg->cbSeg = cbPostLeft;
462	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core);
463	Assert(fInserted); RT_NOREF(fInserted);
464	}
465	else
466	{
467	/* Split the segment into 2 new segments. */
468	LogFlowFunc(("Split segment pSeg=%#p\n", pSeg));
469	PDRVDISKSEGMENT pSegPost = (PDRVDISKSEGMENT)RTMemAllocZ(sizeof(DRVDISKSEGMENT));
470	if (pSegPost)
471	{
472	pSegPost->Core.Key = pSeg->Core.Key + cbPreLeft + cbRange;
473	pSegPost->Core.KeyLast = pSeg->Core.KeyLast;
474	pSegPost->cbSeg = cbPostLeft;
475	pSegPost->pbSeg = (uint8_t *)RTMemAllocZ(cbPostLeft);
476	if (!pSegPost->pbSeg)
477	RTMemFree(pSegPost);
478	else
479	{
480	memcpy(pSegPost->pbSeg, pSeg->pbSeg + cbPreLeft + cbRange, cbPostLeft);
481	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSegPost->Core);
482	Assert(fInserted); RT_NOREF(fInserted);
483	}
484	}
485
486	/* Shrink the current segment. */
487	pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPreLeft);
488	pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT));
489	pSeg->Core.KeyLast = pSeg->Core.Key + cbPreLeft - 1;
490	pSeg->cbSeg = cbPreLeft;
491	bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core);
492	Assert(fInserted); RT_NOREF(fInserted);
493	} /* if (cbPreLeft && cbPostLeft) */
494	}
495
496	offStart += cbRange;
497	cbLeft -= cbRange;
498	}
499	}
500
501	LogFlowFunc(("returns rc=%Rrc\n", rc));
502	return rc;
503	}
504
505	/* -=-=-=-=- IMedia -=-=-=-=- */
506
507
508	/*********************************************************************************************************************************
509	* Media interface methods *
510	*********************************************************************************************************************************/
511
512	/** @copydoc PDMIMEDIA::pfnRead */
513	static DECLCALLBACK(int) drvramdiskRead(PPDMIMEDIA pInterface,
514	uint64_t off, void *pvBuf, size_t cbRead)
515	{
516	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
517	RTSGSEG Seg;
518	RTSGBUF SgBuf;
519
520	Seg.cbSeg = cbRead;
521	Seg.pvSeg = pvBuf;
522	RTSgBufInit(&SgBuf, &Seg, 1);
523	return drvramdiskReadWorker(pThis, &SgBuf, off, cbRead);
524	}
525
526	/** @copydoc PDMIMEDIA::pfnWrite */
527	static DECLCALLBACK(int) drvramdiskWrite(PPDMIMEDIA pInterface,
528	uint64_t off, const void *pvBuf,
529	size_t cbWrite)
530	{
531	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
532	RTSGSEG Seg;
533	RTSGBUF SgBuf;
534
535	Seg.cbSeg = cbWrite;
536	Seg.pvSeg = (void *)pvBuf;
537	RTSgBufInit(&SgBuf, &Seg, 1);
538	return drvramdiskWriteWorker(pThis, &SgBuf, off, cbWrite);
539	}
540
541	/** @copydoc PDMIMEDIA::pfnFlush */
542	static DECLCALLBACK(int) drvramdiskFlush(PPDMIMEDIA pInterface)
543	{
544	RT_NOREF1(pInterface);
545	/* Nothing to do here. */
546	return VINF_SUCCESS;
547	}
548
549	/** @copydoc PDMIMEDIA::pfnGetSize */
550	static DECLCALLBACK(uint64_t) drvramdiskGetSize(PPDMIMEDIA pInterface)
551	{
552	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
553	return pThis->cbDisk;
554	}
555
556	/** @interface_method_impl{PDMIMEDIA,pfnBiosIsVisible} */
557	static DECLCALLBACK(bool) drvramdiskBiosIsVisible(PPDMIMEDIA pInterface)
558	{
559	RT_NOREF1(pInterface);
560	return false;
561	}
562
563	/** @copydoc PDMIMEDIA::pfnGetType */
564	static DECLCALLBACK(PDMMEDIATYPE) drvramdiskGetType(PPDMIMEDIA pInterface)
565	{
566	RT_NOREF1(pInterface);
567	return PDMMEDIATYPE_HARD_DISK;
568	}
569
570	/** @copydoc PDMIMEDIA::pfnIsReadOnly */
571	static DECLCALLBACK(bool) drvramdiskIsReadOnly(PPDMIMEDIA pInterface)
572	{
573	RT_NOREF1(pInterface);
574	return false; /** @todo */
575	}
576
577	/** @copydoc PDMIMEDIA::pfnBiosGetPCHSGeometry */
578	static DECLCALLBACK(int) drvramdiskBiosGetPCHSGeometry(PPDMIMEDIA pInterface,
579	PPDMMEDIAGEOMETRY pPCHSGeometry)
580	{
581	RT_NOREF2(pInterface, pPCHSGeometry);
582	return VERR_NOT_IMPLEMENTED;
583	}
584
585	/** @copydoc PDMIMEDIA::pfnBiosSetPCHSGeometry */
586	static DECLCALLBACK(int) drvramdiskBiosSetPCHSGeometry(PPDMIMEDIA pInterface,
587	PCPDMMEDIAGEOMETRY pPCHSGeometry)
588	{
589	RT_NOREF2(pInterface, pPCHSGeometry);
590	return VERR_NOT_IMPLEMENTED;
591	}
592
593	/** @copydoc PDMIMEDIA::pfnBiosGetLCHSGeometry */
594	static DECLCALLBACK(int) drvramdiskBiosGetLCHSGeometry(PPDMIMEDIA pInterface,
595	PPDMMEDIAGEOMETRY pLCHSGeometry)
596	{
597	RT_NOREF2(pInterface, pLCHSGeometry);
598	return VERR_NOT_IMPLEMENTED;
599	}
600
601	/** @copydoc PDMIMEDIA::pfnBiosSetLCHSGeometry */
602	static DECLCALLBACK(int) drvramdiskBiosSetLCHSGeometry(PPDMIMEDIA pInterface,
603	PCPDMMEDIAGEOMETRY pLCHSGeometry)
604	{
605	RT_NOREF2(pInterface, pLCHSGeometry);
606	return VERR_NOT_IMPLEMENTED;
607	}
608
609	/** @copydoc PDMIMEDIA::pfnGetUuid */
610	static DECLCALLBACK(int) drvramdiskGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid)
611	{
612	RT_NOREF1(pInterface);
613	return RTUuidClear(pUuid);
614	}
615
616	/** @copydoc PDMIMEDIA::pfnGetSectorSize */
617	static DECLCALLBACK(uint32_t) drvramdiskGetSectorSize(PPDMIMEDIA pInterface)
618	{
619	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
620	return pThis->cbSector;
621	}
622
623	/** @copydoc PDMIMEDIA::pfnDiscard */
624	static DECLCALLBACK(int) drvramdiskDiscard(PPDMIMEDIA pInterface, PCRTRANGE paRanges, unsigned cRanges)
625	{
626	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
627	return drvramdiskDiscardRecords(pThis, paRanges, cRanges);
628	}
629
630	/** @copydoc PDMIMEDIA::pfnReadPcBios */
631	static DECLCALLBACK(int) drvramdiskReadPcBios(PPDMIMEDIA pInterface,
632	uint64_t off, void *pvBuf, size_t cbRead)
633	{
634	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
635	RTSGSEG Seg;
636	RTSGBUF SgBuf;
637
638	Seg.cbSeg = cbRead;
639	Seg.pvSeg = pvBuf;
640	RTSgBufInit(&SgBuf, &Seg, 1);
641	return drvramdiskReadWorker(pThis, &SgBuf, off, cbRead);
642	}
643
644	/** @interface_method_impl{PDMIMEDIA,pfnIsNonRotational} */
645	static DECLCALLBACK(bool) drvramdiskIsNonRotational(PPDMIMEDIA pInterface)
646	{
647	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia);
648	return pThis->fNonRotational;
649	}
650
651
652	/*********************************************************************************************************************************
653	* Extended media interface methods *
654	*********************************************************************************************************************************/
655
656	static void drvramdiskMediaExIoReqWarningOutOfMemory(PPDMDRVINS pDrvIns)
657	{
658	int rc;
659	LogRel(("RamDisk#%u: Out of memory\n", pDrvIns->iInstance));
660	rc = PDMDrvHlpVMSetRuntimeError(pDrvIns, VMSETRTERR_FLAGS_SUSPEND \| VMSETRTERR_FLAGS_NO_WAIT, "DrvRamDisk_OOM",
661	N_("There is not enough free memory for the ramdisk"));
662	AssertRC(rc);
663	}
664
665	/**
666	* Checks whether a given status code indicates a recoverable error
667	* suspending the VM if it is.
668	*
669	* @returns Flag indicating whether the status code is a recoverable error
670	* (full disk, broken network connection).
671	* @param pThis VBox disk container instance data.
672	* @param rc Status code to check.
673	*/
674	bool drvramdiskMediaExIoReqIsRedoSetWarning(PDRVRAMDISK pThis, int rc)
675	{
676	if (rc == VERR_NO_MEMORY)
677	{
678	if (ASMAtomicCmpXchgBool(&pThis->fRedo, true, false))
679	drvramdiskMediaExIoReqWarningOutOfMemory(pThis->pDrvIns);
680	return true;
681	}
682
683	return false;
684	}
685
686	/**
687	* Syncs the memory buffers between the I/O request allocator and the internal buffer.
688	*
689	* @returns VBox status code.
690	* @param pThis VBox disk container instance data.
691	* @param pIoReq I/O request to sync.
692	* @param fToIoBuf Flag indicating the sync direction.
693	* true to copy data from the allocators buffer to our internal buffer.
694	* false for the other direction.
695	*/
696	DECLINLINE(int) drvramdiskMediaExIoReqBufSync(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, bool fToIoBuf)
697	{
698	int rc = VINF_SUCCESS;
699
700	Assert(pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ \|\| pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE);
701
702	/* Make sure the buffer is reset. */
703	RTSgBufReset(&pIoReq->ReadWrite.IoBuf.SgBuf);
704
705	if (fToIoBuf)
706	rc = pThis->pDrvMediaExPort->pfnIoReqCopyToBuf(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0],
707	(uint32_t)(pIoReq->ReadWrite.cbReq - pIoReq->ReadWrite.cbReqLeft),
708	&pIoReq->ReadWrite.IoBuf.SgBuf,
709	RT_MIN(pIoReq->ReadWrite.cbIoBuf, pIoReq->ReadWrite.cbReqLeft));
710	else
711	rc = pThis->pDrvMediaExPort->pfnIoReqCopyFromBuf(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0],
712	(uint32_t)(pIoReq->ReadWrite.cbReq - pIoReq->ReadWrite.cbReqLeft),
713	&pIoReq->ReadWrite.IoBuf.SgBuf,
714	RT_MIN(pIoReq->ReadWrite.cbIoBuf, pIoReq->ReadWrite.cbReqLeft));
715
716	RTSgBufReset(&pIoReq->ReadWrite.IoBuf.SgBuf);
717	return rc;
718	}
719
720	/**
721	* Hashes the I/O request ID to an index for the allocated I/O request bin.
722	*/
723	DECLINLINE(unsigned) drvramdiskMediaExIoReqIdHash(PDMMEDIAEXIOREQID uIoReqId)
724	{
725	return uIoReqId % DRVVD_VDIOREQ_ALLOC_BINS; /** @todo Find something better? */
726	}
727
728	/**
729	* Inserts the given I/O request in to the list of allocated I/O requests.
730	*
731	* @returns VBox status code.
732	* @param pThis VBox disk container instance data.
733	* @param pIoReq I/O request to insert.
734	*/
735	static int drvramdiskMediaExIoReqInsert(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
736	{
737	int rc = VINF_SUCCESS;
738	unsigned idxBin = drvramdiskMediaExIoReqIdHash(pIoReq->uIoReqId);
739
740	rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
741	if (RT_SUCCESS(rc))
742	{
743	/* Search for conflicting I/O request ID. */
744	PPDMMEDIAEXIOREQINT pIt;
745	RTListForEach(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, pIt, PDMMEDIAEXIOREQINT, NdAllocatedList)
746	{
747	if (RT_UNLIKELY(pIt->uIoReqId == pIoReq->uIoReqId))
748	{
749	rc = VERR_PDM_MEDIAEX_IOREQID_CONFLICT;
750	break;
751	}
752	}
753	if (RT_SUCCESS(rc))
754	RTListAppend(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, &pIoReq->NdAllocatedList);
755	RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
756	}
757
758	return rc;
759	}
760
761	/**
762	* Removes the given I/O request from the list of allocated I/O requests.
763	*
764	* @returns VBox status code.
765	* @param pThis VBox disk container instance data.
766	* @param pIoReq I/O request to insert.
767	*/
768	static int drvramdiskMediaExIoReqRemove(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
769	{
770	int rc = VINF_SUCCESS;
771	unsigned idxBin = drvramdiskMediaExIoReqIdHash(pIoReq->uIoReqId);
772
773	rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
774	if (RT_SUCCESS(rc))
775	{
776	RTListNodeRemove(&pIoReq->NdAllocatedList);
777	RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
778	}
779
780	return rc;
781	}
782
783	/**
784	* I/O request completion worker.
785	*
786	* @returns VBox status code.
787	* @param pThis VBox disk container instance data.
788	* @param pIoReq I/O request to complete.
789	* @param rcReq The status code the request completed with.
790	* @param fUpNotify Flag whether to notify the driver/device above us about the completion.
791	*/
792	static int drvramdiskMediaExIoReqCompleteWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, int rcReq, bool fUpNotify)
793	{
794	int rc;
795	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_COMPLETING, VDIOREQSTATE_ACTIVE);
796	if (fXchg)
797	ASMAtomicDecU32(&pThis->cIoReqsActive);
798	else
799	{
800	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
801	rcReq = VERR_PDM_MEDIAEX_IOREQ_CANCELED;
802	}
803
804	ASMAtomicXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_COMPLETED);
805
806	/*
807	* Leave a release log entry if the request was active for more than 25 seconds
808	* (30 seconds is the timeout of the guest).
809	*/
810	uint64_t tsNow = RTTimeMilliTS();
811	if (tsNow - pIoReq->tsSubmit >= 25 * 1000)
812	{
813	const char *pcszReq = NULL;
814
815	switch (pIoReq->enmType)
816	{
817	case PDMMEDIAEXIOREQTYPE_READ:
818	pcszReq = "Read";
819	break;
820	case PDMMEDIAEXIOREQTYPE_WRITE:
821	pcszReq = "Write";
822	break;
823	case PDMMEDIAEXIOREQTYPE_FLUSH:
824	pcszReq = "Flush";
825	break;
826	case PDMMEDIAEXIOREQTYPE_DISCARD:
827	pcszReq = "Discard";
828	break;
829	default:
830	pcszReq = "<Invalid>";
831	}
832
833	LogRel(("RamDisk#%u: %s request was active for %llu seconds\n",
834	pThis->pDrvIns->iInstance, pcszReq, (tsNow - pIoReq->tsSubmit) / 1000));
835	}
836
837	if (RT_FAILURE(rcReq))
838	{
839	/* Log the error. */
840	if (pThis->cErrors++ < 100)
841	{
842	if (rcReq == VERR_PDM_MEDIAEX_IOREQ_CANCELED)
843	{
844	if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_FLUSH)
845	LogRel(("RamDisk#%u: Aborted flush returned rc=%Rrc\n",
846	pThis->pDrvIns->iInstance, rcReq));
847	else
848	LogRel(("RamDisk#%u: Aborted %s (%u bytes left) returned rc=%Rrc\n",
849	pThis->pDrvIns->iInstance,
850	pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ
851	? "read"
852	: "write",
853	pIoReq->ReadWrite.cbReqLeft, rcReq));
854	}
855	else
856	{
857	if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_FLUSH)
858	LogRel(("RamDisk#%u: Flush returned rc=%Rrc\n",
859	pThis->pDrvIns->iInstance, rcReq));
860	else
861	LogRel(("RamDisk#%u: %s (%u bytes left) returned rc=%Rrc\n",
862	pThis->pDrvIns->iInstance,
863	pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ
864	? "Read"
865	: "Write",
866	pIoReq->ReadWrite.cbReqLeft, rcReq));
867	}
868	}
869	}
870
871	if (fUpNotify)
872	{
873	rc = pThis->pDrvMediaExPort->pfnIoReqCompleteNotify(pThis->pDrvMediaExPort,
874	pIoReq, &pIoReq->abAlloc[0], rcReq);
875	AssertRC(rc);
876	}
877
878	return rcReq;
879	}
880
881	/**
882	* Allocates a memory buffer suitable for I/O for the given request.
883	*
884	* @returns VBox status code.
885	* @retval VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS if there is no I/O memory available to allocate and
886	* the request was placed on a waiting list.
887	* @param pThis VBox disk container instance data.
888	* @param pIoReq I/O request to allocate memory for.
889	* @param cb Size of the buffer.
890	*/
891	DECLINLINE(int) drvramdiskMediaExIoReqBufAlloc(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, size_t cb)
892	{
893	int rc = IOBUFMgrAllocBuf(pThis->hIoBufMgr, &pIoReq->ReadWrite.IoBuf, cb, &pIoReq->ReadWrite.cbIoBuf);
894	if (rc == VERR_NO_MEMORY)
895	{
896	RTCritSectEnter(&pThis->CritSectIoReqsIoBufWait);
897	RTListAppend(&pThis->LstIoReqIoBufWait, &pIoReq->NdLstWait);
898	RTCritSectLeave(&pThis->CritSectIoReqsIoBufWait);
899	ASMAtomicIncU32(&pThis->cIoReqsWaiting);
900	rc = VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS;
901	}
902
903	return rc;
904	}
905
906	/**
907	* Worker for a read request.
908	*
909	* @returns VBox status code.
910	* @param pThis RAM disk container instance data.
911	* @param pIoReq The read request.
912	*/
913	static DECLCALLBACK(int) drvramdiskIoReqReadWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
914	{
915	size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf);
916	int rc = drvramdiskReadWorker(pThis, &pIoReq->ReadWrite.IoBuf.SgBuf, pIoReq->ReadWrite.offStart,
917	cbReqIo);
918	drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc);
919	return VINF_SUCCESS;
920	}
921
922	/**
923	* Worker for a read request.
924	*
925	* @returns VBox status code.
926	* @param pThis RAM disk container instance data.
927	* @param pIoReq The read request.
928	*/
929	static DECLCALLBACK(int) drvramdiskIoReqWriteWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
930	{
931	size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf);
932	int rc = drvramdiskWriteWorker(pThis, &pIoReq->ReadWrite.IoBuf.SgBuf, pIoReq->ReadWrite.offStart,
933	cbReqIo);
934	drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc);
935	return VINF_SUCCESS;
936	}
937
938	/**
939	* Processes a read/write request.
940	*
941	* @returns VBox status code.
942	* @param pThis VBox disk container instance data.
943	* @param pIoReq I/O request to process.
944	* @param fUpNotify Flag whether to notify the driver/device above us about the completion.
945	*/
946	static int drvramdiskMediaExIoReqReadWriteProcess(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, bool fUpNotify)
947	{
948	int rc = VINF_SUCCESS;
949
950	Assert(pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ \|\| pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE);
951
952	while ( pIoReq->ReadWrite.cbReqLeft
953	&& rc == VINF_SUCCESS)
954	{
955	if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ)
956	rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT,
957	(PFNRT)drvramdiskIoReqReadWorker, 2, pThis, pIoReq);
958	else
959	{
960	/* Sync memory buffer from the request initiator. */
961	rc = drvramdiskMediaExIoReqBufSync(pThis, pIoReq, true /* fToIoBuf */);
962	if (RT_SUCCESS(rc))
963	rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT,
964	(PFNRT)drvramdiskIoReqWriteWorker, 2, pThis, pIoReq);
965	}
966
967	if (rc == VINF_SUCCESS)
968	rc = VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS;
969	}
970
971	if (rc != VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS)
972	{
973	Assert(!pIoReq->ReadWrite.cbReqLeft \|\| RT_FAILURE(rc));
974	rc = drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rc, fUpNotify);
975	}
976
977	return rc;
978	}
979
980
981	/**
982	* Frees a I/O memory buffer allocated previously.
983	*
984	* @returns nothing.
985	* @param pThis VBox disk container instance data.
986	* @param pIoReq I/O request for which to free memory.
987	*/
988	DECLINLINE(void) drvramdiskMediaExIoReqBufFree(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
989	{
990	if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ
991	\|\| pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE)
992	{
993	IOBUFMgrFreeBuf(&pIoReq->ReadWrite.IoBuf);
994
995	if (ASMAtomicReadU32(&pThis->cIoReqsWaiting) > 0)
996	{
997	/* Try to process as many requests as possible. */
998	RTCritSectEnter(&pThis->CritSectIoReqsIoBufWait);
999	PPDMMEDIAEXIOREQINT pIoReqCur, pIoReqNext;
1000
1001	RTListForEachSafe(&pThis->LstIoReqIoBufWait, pIoReqCur, pIoReqNext, PDMMEDIAEXIOREQINT, NdLstWait)
1002	{
1003	/* Allocate a suitable I/O buffer for this request. */
1004	int rc = IOBUFMgrAllocBuf(pThis->hIoBufMgr, &pIoReqCur->ReadWrite.IoBuf, pIoReqCur->ReadWrite.cbReq,
1005	&pIoReqCur->ReadWrite.cbIoBuf);
1006	if (rc == VINF_SUCCESS)
1007	{
1008	ASMAtomicDecU32(&pThis->cIoReqsWaiting);
1009	RTListNodeRemove(&pIoReqCur->NdLstWait);
1010
1011	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReqCur->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED);
1012	if (RT_UNLIKELY(!fXchg))
1013	{
1014	/* Must have been canceled inbetween. */
1015	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1016	drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReqCur, VERR_PDM_MEDIAEX_IOREQ_CANCELED, true /* fUpNotify */);
1017	}
1018	ASMAtomicIncU32(&pThis->cIoReqsActive);
1019	rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReqCur, true /* fUpNotify */);
1020	}
1021	else
1022	{
1023	Assert(rc == VERR_NO_MEMORY);
1024	break;
1025	}
1026	}
1027	RTCritSectLeave(&pThis->CritSectIoReqsIoBufWait);
1028	}
1029	}
1030	}
1031
1032
1033	/**
1034	* Returns whether the VM is in a running state.
1035	*
1036	* @returns Flag indicating whether the VM is currently in a running state.
1037	* @param pThis VBox disk container instance data.
1038	*/
1039	DECLINLINE(bool) drvramdiskMediaExIoReqIsVmRunning(PDRVRAMDISK pThis)
1040	{
1041	VMSTATE enmVmState = PDMDrvHlpVMState(pThis->pDrvIns);
1042	if ( enmVmState == VMSTATE_RESUMING
1043	\|\| enmVmState == VMSTATE_RUNNING
1044	\|\| enmVmState == VMSTATE_RUNNING_LS
1045	\|\| enmVmState == VMSTATE_RUNNING_FT
1046	\|\| enmVmState == VMSTATE_RESETTING
1047	\|\| enmVmState == VMSTATE_RESETTING_LS
1048	\|\| enmVmState == VMSTATE_SOFT_RESETTING
1049	\|\| enmVmState == VMSTATE_SOFT_RESETTING_LS
1050	\|\| enmVmState == VMSTATE_SUSPENDING
1051	\|\| enmVmState == VMSTATE_SUSPENDING_LS
1052	\|\| enmVmState == VMSTATE_SUSPENDING_EXT_LS)
1053	return true;
1054
1055	return false;
1056	}
1057
1058	/**
1059	* @copydoc FNVDASYNCTRANSFERCOMPLETE
1060	*/
1061	static void drvramdiskMediaExIoReqComplete(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq,
1062	int rcReq)
1063	{
1064	/*
1065	* For a read we need to sync the memory before continuing to process
1066	* the request further.
1067	*/
1068	if ( RT_SUCCESS(rcReq)
1069	&& pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ)
1070	rcReq = drvramdiskMediaExIoReqBufSync(pThis, pIoReq, false /* fToIoBuf */);
1071
1072	/*
1073	* When the request owner instructs us to handle recoverable errors like full disks
1074	* do it. Mark the request as suspended, notify the owner and put the request on the
1075	* redo list.
1076	*/
1077	if ( RT_FAILURE(rcReq)
1078	&& (pIoReq->fFlags & PDMIMEDIAEX_F_SUSPEND_ON_RECOVERABLE_ERR)
1079	&& drvramdiskMediaExIoReqIsRedoSetWarning(pThis, rcReq))
1080	{
1081	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_SUSPENDED, VDIOREQSTATE_ACTIVE);
1082	if (fXchg)
1083	{
1084	/* Put on redo list and adjust active request counter. */
1085	RTCritSectEnter(&pThis->CritSectIoReqRedo);
1086	RTListAppend(&pThis->LstIoReqRedo, &pIoReq->NdLstWait);
1087	RTCritSectLeave(&pThis->CritSectIoReqRedo);
1088	ASMAtomicDecU32(&pThis->cIoReqsActive);
1089	pThis->pDrvMediaExPort->pfnIoReqStateChanged(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0],
1090	PDMMEDIAEXIOREQSTATE_SUSPENDED);
1091	}
1092	else
1093	{
1094	/* Request was canceled inbetween, so don't care and notify the owner about the completed request. */
1095	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1096	drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rcReq, true /* fUpNotify */);
1097	}
1098	}
1099	else
1100	{
1101	/* Adjust the remaining amount to transfer. */
1102	size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf);
1103	pIoReq->ReadWrite.offStart += cbReqIo;
1104	pIoReq->ReadWrite.cbReqLeft -= cbReqIo;
1105
1106	if ( RT_FAILURE(rcReq)
1107	\|\| !pIoReq->ReadWrite.cbReqLeft
1108	\|\| ( pIoReq->enmType != PDMMEDIAEXIOREQTYPE_READ
1109	&& pIoReq->enmType != PDMMEDIAEXIOREQTYPE_WRITE))
1110	drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rcReq, true /* fUpNotify */);
1111	else
1112	drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, true /* fUpNotify */);
1113	}
1114	}
1115
1116	/**
1117	* Worker for a flush request.
1118	*
1119	* @returns VBox status code.
1120	* @param pThis RAM disk container instance data.
1121	* @param pIoReq The flush request.
1122	*/
1123	static DECLCALLBACK(int) drvramdiskIoReqFlushWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
1124	{
1125	/* Nothing to do for a ram disk. */
1126	drvramdiskMediaExIoReqComplete(pThis, pIoReq, VINF_SUCCESS);
1127	return VINF_SUCCESS;
1128	}
1129
1130	/**
1131	* Worker for a discard request.
1132	*
1133	* @returns VBox status code.
1134	* @param pThis RAM disk container instance data.
1135	* @param pIoReq The discard request.
1136	*/
1137	static DECLCALLBACK(int) drvramdiskIoReqDiscardWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq)
1138	{
1139	int rc = drvramdiskDiscardRecords(pThis, pIoReq->Discard.paRanges, pIoReq->Discard.cRanges);
1140	drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc);
1141	return VINF_SUCCESS;
1142	}
1143
1144	/**
1145	* @interface_method_impl{PDMIMEDIAEX,pfnQueryFeatures}
1146	*/
1147	static DECLCALLBACK(int) drvramdiskQueryFeatures(PPDMIMEDIAEX pInterface, uint32_t *pfFeatures)
1148	{
1149	RT_NOREF1(pInterface);
1150	*pfFeatures = PDMIMEDIAEX_FEATURE_F_ASYNC \| PDMIMEDIAEX_FEATURE_F_DISCARD;
1151	return VINF_SUCCESS;
1152	}
1153
1154
1155	/**
1156	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqAllocSizeSet}
1157	*/
1158	static DECLCALLBACK(int) drvramdiskIoReqAllocSizeSet(PPDMIMEDIAEX pInterface, size_t cbIoReqAlloc)
1159	{
1160	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1161
1162	if (RT_UNLIKELY(pThis->hIoReqCache != NIL_RTMEMCACHE))
1163	return VERR_INVALID_STATE;
1164
1165	return RTMemCacheCreate(&pThis->hIoReqCache, sizeof(PDMMEDIAEXIOREQINT) + cbIoReqAlloc, 0, UINT32_MAX,
1166	NULL, NULL, NULL, 0);
1167	}
1168
1169	/**
1170	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqAlloc}
1171	*/
1172	static DECLCALLBACK(int) drvramdiskIoReqAlloc(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq, void **ppvIoReqAlloc,
1173	PDMMEDIAEXIOREQID uIoReqId, uint32_t fFlags)
1174	{
1175	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1176
1177	AssertReturn(!(fFlags & ~PDMIMEDIAEX_F_VALID), VERR_INVALID_PARAMETER);
1178
1179	PPDMMEDIAEXIOREQINT pIoReq = (PPDMMEDIAEXIOREQINT)RTMemCacheAlloc(pThis->hIoReqCache);
1180
1181	if (RT_UNLIKELY(!pIoReq))
1182	return VERR_NO_MEMORY;
1183
1184	pIoReq->uIoReqId = uIoReqId;
1185	pIoReq->fFlags = fFlags;
1186	pIoReq->pDisk = pThis;
1187	pIoReq->enmState = VDIOREQSTATE_ALLOCATED;
1188	pIoReq->enmType = PDMMEDIAEXIOREQTYPE_INVALID;
1189
1190	int rc = drvramdiskMediaExIoReqInsert(pThis, pIoReq);
1191	if (RT_SUCCESS(rc))
1192	{
1193	*phIoReq = pIoReq;
1194	*ppvIoReqAlloc = &pIoReq->abAlloc[0];
1195	}
1196	else
1197	RTMemCacheFree(pThis->hIoReqCache, pIoReq);
1198
1199	return rc;
1200	}
1201
1202	/**
1203	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqFree}
1204	*/
1205	static DECLCALLBACK(int) drvramdiskIoReqFree(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq)
1206	{
1207	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1208	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1209
1210	if ( pIoReq->enmState != VDIOREQSTATE_COMPLETED
1211	&& pIoReq->enmState != VDIOREQSTATE_ALLOCATED)
1212	return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE;
1213
1214	/* Remove from allocated list. */
1215	int rc = drvramdiskMediaExIoReqRemove(pThis, pIoReq);
1216	if (RT_FAILURE(rc))
1217	return rc;
1218
1219	/* Free any associated I/O memory. */
1220	drvramdiskMediaExIoReqBufFree(pThis, pIoReq);
1221
1222	/* For discard request discard the range array. */
1223	if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_DISCARD
1224	&& pIoReq->Discard.paRanges)
1225	{
1226	RTMemFree(pIoReq->Discard.paRanges);
1227	pIoReq->Discard.paRanges = NULL;
1228	}
1229
1230	pIoReq->enmState = VDIOREQSTATE_FREE;
1231	RTMemCacheFree(pThis->hIoReqCache, pIoReq);
1232	return VINF_SUCCESS;
1233	}
1234
1235	/**
1236	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqQueryResidual}
1237	*/
1238	static DECLCALLBACK(int) drvramdiskIoReqQueryResidual(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, size_t *pcbResidual)
1239	{
1240	RT_NOREF2(pInterface, hIoReq);
1241
1242	*pcbResidual = 0;
1243	return VINF_SUCCESS;
1244	}
1245
1246	/**
1247	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqQueryXferSize}
1248	*/
1249	static DECLCALLBACK(int) drvramdiskIoReqQueryXferSize(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, size_t *pcbXfer)
1250	{
1251	RT_NOREF1(pInterface);
1252	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1253
1254	if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ
1255	\|\| pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE)
1256	*pcbXfer = pIoReq->ReadWrite.cbReq;
1257	else
1258	*pcbXfer = 0;
1259
1260	return VINF_SUCCESS;
1261	}
1262
1263	/**
1264	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancelAll}
1265	*/
1266	static DECLCALLBACK(int) drvramdiskIoReqCancelAll(PPDMIMEDIAEX pInterface)
1267	{
1268	RT_NOREF1(pInterface);
1269	return VINF_SUCCESS; /** @todo */
1270	}
1271
1272	/**
1273	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancel}
1274	*/
1275	static DECLCALLBACK(int) drvramdiskIoReqCancel(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQID uIoReqId)
1276	{
1277	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1278	unsigned idxBin = drvramdiskMediaExIoReqIdHash(uIoReqId);
1279
1280	int rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
1281	if (RT_SUCCESS(rc))
1282	{
1283	/* Search for I/O request with ID. */
1284	PPDMMEDIAEXIOREQINT pIt;
1285	rc = VERR_PDM_MEDIAEX_IOREQID_NOT_FOUND;
1286
1287	RTListForEach(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, pIt, PDMMEDIAEXIOREQINT, NdAllocatedList)
1288	{
1289	if (pIt->uIoReqId == uIoReqId)
1290	{
1291	bool fXchg = true;
1292	VDIOREQSTATE enmStateOld = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIt->enmState);
1293
1294	/*
1295	* We might have to try canceling the request multiple times if it transitioned from
1296	* ALLOCATED to ACTIVE or to SUSPENDED between reading the state and trying to change it.
1297	*/
1298	while ( ( enmStateOld == VDIOREQSTATE_ALLOCATED
1299	\|\| enmStateOld == VDIOREQSTATE_ACTIVE
1300	\|\| enmStateOld == VDIOREQSTATE_SUSPENDED)
1301	&& !fXchg)
1302	{
1303	fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIt->enmState, VDIOREQSTATE_CANCELED, enmStateOld);
1304	if (!fXchg)
1305	enmStateOld = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIt->enmState);
1306	}
1307
1308	if (fXchg)
1309	{
1310	ASMAtomicDecU32(&pThis->cIoReqsActive);
1311	rc = VINF_SUCCESS;
1312	}
1313	break;
1314	}
1315	}
1316	RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc);
1317	}
1318
1319	return rc;
1320	}
1321
1322	/**
1323	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqRead}
1324	*/
1325	static DECLCALLBACK(int) drvramdiskIoReqRead(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbRead)
1326	{
1327	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1328	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1329	VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState);
1330
1331	if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED))
1332	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1333
1334	if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED))
1335	return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE;
1336
1337	pIoReq->enmType = PDMMEDIAEXIOREQTYPE_READ;
1338	pIoReq->tsSubmit = RTTimeMilliTS();
1339	pIoReq->ReadWrite.offStart = off;
1340	pIoReq->ReadWrite.cbReq = cbRead;
1341	pIoReq->ReadWrite.cbReqLeft = cbRead;
1342	/* Allocate a suitable I/O buffer for this request. */
1343	int rc = drvramdiskMediaExIoReqBufAlloc(pThis, pIoReq, cbRead);
1344	if (rc == VINF_SUCCESS)
1345	{
1346	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED);
1347	if (RT_UNLIKELY(!fXchg))
1348	{
1349	/* Must have been canceled inbetween. */
1350	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1351	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1352	}
1353	ASMAtomicIncU32(&pThis->cIoReqsActive);
1354
1355	rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, false /* fUpNotify */);
1356	}
1357
1358	return rc;
1359	}
1360
1361	/**
1362	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqWrite}
1363	*/
1364	static DECLCALLBACK(int) drvramdiskIoReqWrite(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbWrite)
1365	{
1366	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1367	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1368	VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState);
1369
1370	if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED))
1371	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1372
1373	if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED))
1374	return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE;
1375
1376	pIoReq->enmType = PDMMEDIAEXIOREQTYPE_WRITE;
1377	pIoReq->tsSubmit = RTTimeMilliTS();
1378	pIoReq->ReadWrite.offStart = off;
1379	pIoReq->ReadWrite.cbReq = cbWrite;
1380	pIoReq->ReadWrite.cbReqLeft = cbWrite;
1381	/* Allocate a suitable I/O buffer for this request. */
1382	int rc = drvramdiskMediaExIoReqBufAlloc(pThis, pIoReq, cbWrite);
1383	if (rc == VINF_SUCCESS)
1384	{
1385	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED);
1386	if (RT_UNLIKELY(!fXchg))
1387	{
1388	/* Must have been canceled inbetween. */
1389	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1390	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1391	}
1392	ASMAtomicIncU32(&pThis->cIoReqsActive);
1393
1394	rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, false /* fUpNotify */);
1395	}
1396
1397	return rc;
1398	}
1399
1400	/**
1401	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqFlush}
1402	*/
1403	static DECLCALLBACK(int) drvramdiskIoReqFlush(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq)
1404	{
1405	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1406	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1407	VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState);
1408
1409	if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED))
1410	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1411
1412	if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED))
1413	return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE;
1414
1415	pIoReq->enmType = PDMMEDIAEXIOREQTYPE_FLUSH;
1416	pIoReq->tsSubmit = RTTimeMilliTS();
1417	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED);
1418	if (RT_UNLIKELY(!fXchg))
1419	{
1420	/* Must have been canceled inbetween. */
1421	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1422	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1423	}
1424
1425	ASMAtomicIncU32(&pThis->cIoReqsActive);
1426	return RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT,
1427	(PFNRT)drvramdiskIoReqFlushWorker, 2, pThis, pIoReq);
1428	}
1429
1430	/**
1431	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqDiscard}
1432	*/
1433	static DECLCALLBACK(int) drvramdiskIoReqDiscard(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, unsigned cRangesMax)
1434	{
1435	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1436	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1437	VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState);
1438
1439	if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED))
1440	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1441
1442	if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED))
1443	return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE;
1444
1445	/* Copy the ranges over now, this can be optimized in the future. */
1446	pIoReq->Discard.paRanges = (PRTRANGE)RTMemAllocZ(cRangesMax * sizeof(RTRANGE));
1447	if (RT_UNLIKELY(!pIoReq->Discard.paRanges))
1448	return VERR_NO_MEMORY;
1449
1450	int rc = pThis->pDrvMediaExPort->pfnIoReqQueryDiscardRanges(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0],
1451	0, cRangesMax, pIoReq->Discard.paRanges,
1452	&pIoReq->Discard.cRanges);
1453	if (RT_SUCCESS(rc))
1454	{
1455	pIoReq->enmType = PDMMEDIAEXIOREQTYPE_DISCARD;
1456	pIoReq->tsSubmit = RTTimeMilliTS();
1457
1458	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED);
1459	if (RT_UNLIKELY(!fXchg))
1460	{
1461	/* Must have been canceled inbetween. */
1462	Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED);
1463	return VERR_PDM_MEDIAEX_IOREQ_CANCELED;
1464	}
1465
1466	ASMAtomicIncU32(&pThis->cIoReqsActive);
1467
1468	rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT,
1469	(PFNRT)drvramdiskIoReqDiscardWorker, 2, pThis, pIoReq);
1470	}
1471
1472	return rc;
1473	}
1474
1475	/**
1476	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetActiveCount}
1477	*/
1478	static DECLCALLBACK(uint32_t) drvramdiskIoReqGetActiveCount(PPDMIMEDIAEX pInterface)
1479	{
1480	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1481	return ASMAtomicReadU32(&pThis->cIoReqsActive);
1482	}
1483
1484	/**
1485	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetSuspendedCount}
1486	*/
1487	static DECLCALLBACK(uint32_t) drvramdiskIoReqGetSuspendedCount(PPDMIMEDIAEX pInterface)
1488	{
1489	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1490
1491	AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), 0);
1492
1493	uint32_t cIoReqSuspended = 0;
1494	PPDMMEDIAEXIOREQINT pIoReq;
1495	RTCritSectEnter(&pThis->CritSectIoReqRedo);
1496	RTListForEach(&pThis->LstIoReqRedo, pIoReq, PDMMEDIAEXIOREQINT, NdLstWait)
1497	{
1498	cIoReqSuspended++;
1499	}
1500	RTCritSectLeave(&pThis->CritSectIoReqRedo);
1501
1502	return cIoReqSuspended;
1503	}
1504
1505	/**
1506	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedStart}
1507	*/
1508	static DECLCALLBACK(int) drvramdiskIoReqQuerySuspendedStart(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq,
1509	void **ppvIoReqAlloc)
1510	{
1511	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1512
1513	AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE);
1514	AssertReturn(!RTListIsEmpty(&pThis->LstIoReqRedo), VERR_NOT_FOUND);
1515
1516	RTCritSectEnter(&pThis->CritSectIoReqRedo);
1517	PPDMMEDIAEXIOREQINT pIoReq = RTListGetFirst(&pThis->LstIoReqRedo, PDMMEDIAEXIOREQINT, NdLstWait);
1518	*phIoReq = pIoReq;
1519	*ppvIoReqAlloc = &pIoReq->abAlloc[0];
1520	RTCritSectLeave(&pThis->CritSectIoReqRedo);
1521
1522	return VINF_SUCCESS;
1523	}
1524
1525	/**
1526	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedNext}
1527	*/
1528	static DECLCALLBACK(int) drvramdiskIoReqQuerySuspendedNext(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq,
1529	PPDMMEDIAEXIOREQ phIoReqNext, void **ppvIoReqAllocNext)
1530	{
1531	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1532	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1533
1534	AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE);
1535	AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE);
1536	AssertReturn(!RTListNodeIsLast(&pThis->LstIoReqRedo, &pIoReq->NdLstWait), VERR_NOT_FOUND);
1537
1538	RTCritSectEnter(&pThis->CritSectIoReqRedo);
1539	PPDMMEDIAEXIOREQINT pIoReqNext = RTListNodeGetNext(&pIoReq->NdLstWait, PDMMEDIAEXIOREQINT, NdLstWait);
1540	*phIoReqNext = pIoReqNext;
1541	*ppvIoReqAllocNext = &pIoReqNext->abAlloc[0];
1542	RTCritSectLeave(&pThis->CritSectIoReqRedo);
1543
1544	return VINF_SUCCESS;
1545	}
1546
1547	/**
1548	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedSave}
1549	*/
1550	static DECLCALLBACK(int) drvramdiskIoReqSuspendedSave(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq)
1551	{
1552	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1553	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1554
1555	RT_NOREF1(pSSM);
1556
1557	AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE);
1558	AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE);
1559	AssertReturn(pIoReq->enmState == VDIOREQSTATE_SUSPENDED, VERR_INVALID_STATE);
1560
1561	return VERR_NOT_IMPLEMENTED;
1562	}
1563
1564	/**
1565	* @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedLoad}
1566	*/
1567	static DECLCALLBACK(int) drvramdiskIoReqSuspendedLoad(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq)
1568	{
1569	PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx);
1570	PPDMMEDIAEXIOREQINT pIoReq = hIoReq;
1571
1572	RT_NOREF1(pSSM);
1573
1574	AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE);
1575	AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE);
1576	AssertReturn(pIoReq->enmState == VDIOREQSTATE_ALLOCATED, VERR_INVALID_STATE);
1577
1578	return VERR_NOT_IMPLEMENTED;
1579	}
1580
1581	static DECLCALLBACK(int) drvramdiskIoReqWorker(RTTHREAD hThrdSelf, void *pvUser)
1582	{
1583	int rc = VINF_SUCCESS;
1584	PDRVRAMDISK pThis = (PDRVRAMDISK)pvUser;
1585
1586	RT_NOREF1(hThrdSelf);
1587
1588	do
1589	{
1590	rc = RTReqQueueProcess(pThis->hReqQ, RT_INDEFINITE_WAIT);
1591	} while (RT_SUCCESS(rc));
1592
1593	return VINF_SUCCESS;
1594	}
1595
1596	/* -=-=-=-=- IBase -=-=-=-=- */
1597
1598	/**
1599	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1600	*/
1601	static DECLCALLBACK(void ) drvramdiskQueryInterface(PPDMIBASE pInterface, const char pszIID)
1602	{
1603	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
1604	PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK);
1605
1606	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
1607	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIA, &pThis->IMedia);
1608	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAEX, &pThis->IMediaEx);
1609
1610	return NULL;
1611	}
1612
1613
1614	/* -=-=-=-=- driver interface -=-=-=-=- */
1615
1616	static DECLCALLBACK(int) drvramdiskTreeDestroy(PAVLRFOFFNODECORE pNode, void *pvUser)
1617	{
1618	PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)pNode;
1619
1620	RT_NOREF1(pvUser);
1621
1622	RTMemFree(pSeg->pbSeg);
1623	RTMemFree(pSeg);
1624	return VINF_SUCCESS;
1625	}
1626
1627	/**
1628	* @copydoc FNPDMDRVDESTRUCT
1629	*/
1630	static DECLCALLBACK(void) drvramdiskDestruct(PPDMDRVINS pDrvIns)
1631	{
1632	PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK);
1633
1634	if (pThis->pTreeSegments)
1635	{
1636	RTAvlrFileOffsetDestroy(pThis->pTreeSegments, drvramdiskTreeDestroy, NULL);
1637	RTMemFree(pThis->pTreeSegments);
1638	}
1639	RTReqQueueDestroy(pThis->hReqQ);
1640	}
1641
1642	/**
1643	* Construct a disk integrity driver instance.
1644	*
1645	* @copydoc FNPDMDRVCONSTRUCT
1646	*/
1647	static DECLCALLBACK(int) drvramdiskConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1648	{
1649	RT_NOREF1(fFlags);
1650	int rc = VINF_SUCCESS;
1651	uint32_t cbIoBufMax;
1652	PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK);
1653	LogFlow(("drvdiskintConstruct: iInstance=%d\n", pDrvIns->iInstance));
1654	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1655
1656	/*
1657	* Validate configuration.
1658	*/
1659	if (!CFGMR3AreValuesValid(pCfg, "Size\0"
1660	"PreAlloc\0"
1661	"IoBufMax\0"
1662	"SectorSize\0"
1663	"NonRotational\0"))
1664	return VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES;
1665
1666	rc = CFGMR3QueryU64(pCfg, "Size", &pThis->cbDisk);
1667	if (RT_FAILURE(rc))
1668	return PDMDRV_SET_ERROR(pDrvIns, rc,
1669	N_("RamDisk: Error querying the media size"));
1670	rc = CFGMR3QueryBoolDef(pCfg, "PreAlloc", &pThis->fPreallocRamDisk, false);
1671	if (RT_FAILURE(rc))
1672	return PDMDRV_SET_ERROR(pDrvIns, rc,
1673	N_("RamDisk: Error querying \"PreAlloc\""));
1674	rc = CFGMR3QueryBoolDef(pCfg, "NonRotational", &pThis->fNonRotational, true);
1675	if (RT_FAILURE(rc))
1676	return PDMDRV_SET_ERROR(pDrvIns, rc,
1677	N_("RamDisk: Error querying \"NonRotational\""));
1678	rc = CFGMR3QueryU32Def(pCfg, "IoBufMax", &cbIoBufMax, 5 * _1M);
1679	if (RT_FAILURE(rc))
1680	return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Failed to query \"IoBufMax\" from the config"));
1681	rc = CFGMR3QueryU32Def(pCfg, "SectorSize", &pThis->cbSector, 512);
1682	if (RT_FAILURE(rc))
1683	return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Failed to query \"SectorSize\" from the config"));
1684
1685	/*
1686	* Initialize most of the data members.
1687	*/
1688	pThis->pDrvIns = pDrvIns;
1689
1690	/* IBase. */
1691	pDrvIns->IBase.pfnQueryInterface = drvramdiskQueryInterface;
1692
1693	/* IMedia */
1694	pThis->IMedia.pfnRead = drvramdiskRead;
1695	pThis->IMedia.pfnWrite = drvramdiskWrite;
1696	pThis->IMedia.pfnFlush = drvramdiskFlush;
1697	pThis->IMedia.pfnGetSize = drvramdiskGetSize;
1698	pThis->IMedia.pfnBiosIsVisible = drvramdiskBiosIsVisible;
1699	pThis->IMedia.pfnGetType = drvramdiskGetType;
1700	pThis->IMedia.pfnIsReadOnly = drvramdiskIsReadOnly;
1701	pThis->IMedia.pfnBiosGetPCHSGeometry = drvramdiskBiosGetPCHSGeometry;
1702	pThis->IMedia.pfnBiosSetPCHSGeometry = drvramdiskBiosSetPCHSGeometry;
1703	pThis->IMedia.pfnBiosGetLCHSGeometry = drvramdiskBiosGetLCHSGeometry;
1704	pThis->IMedia.pfnBiosSetLCHSGeometry = drvramdiskBiosSetLCHSGeometry;
1705	pThis->IMedia.pfnGetUuid = drvramdiskGetUuid;
1706	pThis->IMedia.pfnGetSectorSize = drvramdiskGetSectorSize;
1707	pThis->IMedia.pfnReadPcBios = drvramdiskReadPcBios;
1708	pThis->IMedia.pfnDiscard = drvramdiskDiscard;
1709	pThis->IMedia.pfnIsNonRotational = drvramdiskIsNonRotational;
1710
1711	/* IMediaEx */
1712	pThis->IMediaEx.pfnQueryFeatures = drvramdiskQueryFeatures;
1713	pThis->IMediaEx.pfnIoReqAllocSizeSet = drvramdiskIoReqAllocSizeSet;
1714	pThis->IMediaEx.pfnIoReqAlloc = drvramdiskIoReqAlloc;
1715	pThis->IMediaEx.pfnIoReqFree = drvramdiskIoReqFree;
1716	pThis->IMediaEx.pfnIoReqQueryResidual = drvramdiskIoReqQueryResidual;
1717	pThis->IMediaEx.pfnIoReqQueryXferSize = drvramdiskIoReqQueryXferSize;
1718	pThis->IMediaEx.pfnIoReqCancelAll = drvramdiskIoReqCancelAll;
1719	pThis->IMediaEx.pfnIoReqCancel = drvramdiskIoReqCancel;
1720	pThis->IMediaEx.pfnIoReqRead = drvramdiskIoReqRead;
1721	pThis->IMediaEx.pfnIoReqWrite = drvramdiskIoReqWrite;
1722	pThis->IMediaEx.pfnIoReqFlush = drvramdiskIoReqFlush;
1723	pThis->IMediaEx.pfnIoReqDiscard = drvramdiskIoReqDiscard;
1724	pThis->IMediaEx.pfnIoReqGetActiveCount = drvramdiskIoReqGetActiveCount;
1725	pThis->IMediaEx.pfnIoReqGetSuspendedCount = drvramdiskIoReqGetSuspendedCount;
1726	pThis->IMediaEx.pfnIoReqQuerySuspendedStart = drvramdiskIoReqQuerySuspendedStart;
1727	pThis->IMediaEx.pfnIoReqQuerySuspendedNext = drvramdiskIoReqQuerySuspendedNext;
1728	pThis->IMediaEx.pfnIoReqSuspendedSave = drvramdiskIoReqSuspendedSave;
1729	pThis->IMediaEx.pfnIoReqSuspendedLoad = drvramdiskIoReqSuspendedLoad;
1730
1731	/* Query the media port interface above us. */
1732	pThis->pDrvMediaPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAPORT);
1733	if (!pThis->pDrvMediaPort)
1734	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_BELOW,
1735	N_("No media port interface above"));
1736
1737	/* Try to attach extended media port interface above.*/
1738	pThis->pDrvMediaExPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAEXPORT);
1739	if (pThis->pDrvMediaExPort)
1740	{
1741	for (unsigned i = 0; i < RT_ELEMENTS(pThis->aIoReqAllocBins); i++)
1742	{
1743	rc = RTSemFastMutexCreate(&pThis->aIoReqAllocBins[i].hMtxLstIoReqAlloc);
1744	if (RT_FAILURE(rc))
1745	break;
1746	RTListInit(&pThis->aIoReqAllocBins[i].LstIoReqAlloc);
1747	}
1748
1749	if (RT_SUCCESS(rc))
1750	rc = RTCritSectInit(&pThis->CritSectIoReqsIoBufWait);
1751
1752	if (RT_SUCCESS(rc))
1753	rc = RTCritSectInit(&pThis->CritSectIoReqRedo);
1754
1755	if (RT_FAILURE(rc))
1756	return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Creating Mutex failed"));
1757
1758	RTListInit(&pThis->LstIoReqIoBufWait);
1759	RTListInit(&pThis->LstIoReqRedo);
1760	}
1761
1762	/* Create the AVL tree. */
1763	pThis->pTreeSegments = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE));
1764	if (!pThis->pTreeSegments)
1765	rc = VERR_NO_MEMORY;
1766
1767	if (pThis->pDrvMediaExPort)
1768	{
1769	rc = RTReqQueueCreate(&pThis->hReqQ);
1770	if (RT_SUCCESS(rc))
1771	{
1772	/* Spin up the worker thread. */
1773	rc = RTThreadCreate(&pThis->hThrdWrk, drvramdiskIoReqWorker, pThis, 0,
1774	RTTHREADTYPE_IO, 0, "RAMDSK");
1775	}
1776	}
1777
1778	if (pThis->pDrvMediaExPort)
1779	rc = IOBUFMgrCreate(&pThis->hIoBufMgr, cbIoBufMax, IOBUFMGR_F_DEFAULT);
1780
1781	/* Read in all data before the start if requested. */
1782	if ( RT_SUCCESS(rc)
1783	&& pThis->fPreallocRamDisk)
1784	{
1785	LogRel(("RamDisk: Preallocating RAM disk...\n"));
1786	return VERR_NOT_IMPLEMENTED;
1787	}
1788
1789	return rc;
1790	}
1791
1792
1793	/**
1794	* Block driver registration record.
1795	*/
1796	const PDMDRVREG g_DrvRamDisk =
1797	{
1798	/* u32Version */
1799	PDM_DRVREG_VERSION,
1800	/* szName */
1801	"RamDisk",
1802	/* szRCMod */
1803	"",
1804	/* szR0Mod */
1805	"",
1806	/* pszDescription */
1807	"RAM disk driver.",
1808	/* fFlags */
1809	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1810	/* fClass. */
1811	PDM_DRVREG_CLASS_BLOCK,
1812	/* cMaxInstances */
1813	~0U,
1814	/* cbInstance */
1815	sizeof(DRVRAMDISK),
1816	/* pfnConstruct */
1817	drvramdiskConstruct,
1818	/* pfnDestruct */
1819	drvramdiskDestruct,
1820	/* pfnRelocate */
1821	NULL,
1822	/* pfnIOCtl */
1823	NULL,
1824	/* pfnPowerOn */
1825	NULL,
1826	/* pfnReset */
1827	NULL,
1828	/* pfnSuspend */
1829	NULL,
1830	/* pfnResume */
1831	NULL,
1832	/* pfnAttach */
1833	NULL,
1834	/* pfnDetach */
1835	NULL,
1836	/* pfnPowerOff */
1837	NULL,
1838	/* pfnSoftReset */
1839	NULL,
1840	/* u32EndVersion */
1841	PDM_DRVREG_VERSION
1842	};
1843

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source: vbox/trunk/src/VBox/Devices/Storage/DrvRamDisk.cpp@ 78272

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