DrvVD.cpp@ 12559

Last change on this file since 12559 was 12474, checked in by vboxsync, 16 years ago
Better fix for not working VMDK's with SATA, a missing define in the Main Makefile prevented async I/O. More checks in drvvdConstruct.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 36.9 KB

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1	/** $Id: DrvVD.cpp 12474 2008-09-15 19:02:54Z vboxsync $ */
2	/** @file
3	*
4	* VBox storage devices:
5	* Media implementation for VBox disk container
6	*/
7
8	/*
9	* Copyright (C) 2006-2008 Sun Microsystems, Inc.
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
20	* Clara, CA 95054 USA or visit http://www.sun.com if you need
21	* additional information or have any questions.
22	*/
23
24
25	/*******************************************************************************
26	* Header files *
27	*******************************************************************************/
28	#define LOG_GROUP LOG_GROUP_DRV_VD
29	#include <VBox/VBoxHDD-new.h>
30	#include <VBox/pdmdrv.h>
31	#include <iprt/alloc.h>
32	#include <iprt/assert.h>
33	#include <iprt/uuid.h>
34	#include <iprt/file.h>
35	#include <iprt/string.h>
36	#include <iprt/cache.h>
37
38	#include "Builtins.h"
39
40
41	/*******************************************************************************
42	* Defined types, constants and macros *
43	*******************************************************************************/
44
45	/** Converts a pointer to VDIDISK::IMedia to a PVBOXDISK. */
46	#define PDMIMEDIA_2_VBOXDISK(pInterface) \
47	( (PVBOXDISK)((uintptr_t)pInterface - RT_OFFSETOF(VBOXDISK, IMedia)) )
48
49	/** Converts a pointer to PDMDRVINS::IBase to a PPDMDRVINS. */
50	#define PDMIBASE_2_DRVINS(pInterface) \
51	( (PPDMDRVINS)((uintptr_t)pInterface - RT_OFFSETOF(PDMDRVINS, IBase)) )
52
53	/** Converts a pointer to PDMDRVINS::IBase to a PVBOXDISK. */
54	#define PDMIBASE_2_VBOXDISK(pInterface) \
55	( PDMINS_2_DATA(PDMIBASE_2_DRVINS(pInterface), PVBOXDISK) )
56
57	/** Converts a pointer to VBOXDISK::IMediaAsync to a PVBOXDISK. */
58	#define PDMIMEDIAASYNC_2_VBOXDISK(pInterface) \
59	( (PVBOXDISK)((uintptr_t)pInterface - RT_OFFSETOF(VBOXDISK, IMediaAsync)) )
60
61	/** Converts a pointer to VBOXDISK::ITransportAsyncPort to a PVBOXDISK. */
62	#define PDMITRANSPORTASYNCPORT_2_VBOXDISK(pInterface) \
63	( (PVBOXDISK)((uintptr_t)pInterface - RT_OFFSETOF(VBOXDISK, ITransportAsyncPort)) )
64
65	/**
66	* Structure for an async I/O task.
67	*/
68	typedef struct DRVVDASYNCTASK
69	{
70	/** Callback which is called on completion. */
71	PFNVDCOMPLETED pfnCompleted;
72	/** Opqaue user data which is passed on completion. */
73	void *pvUser;
74	/** Opaque user data the caller passed on transfer initiation. */
75	void *pvUserCaller;
76	} DRVVDASYNCTASK, *PDRVVDASYNCTASK;
77
78	/**
79	* VBox disk container, image information, private part.
80	*/
81
82	typedef struct VBOXIMAGE
83	{
84	/** Pointer to next image. */
85	struct VBOXIMAGE *pNext;
86	/** Pointer to list of VD interfaces. Per-image. */
87	PVDINTERFACE pVDIfsImage;
88	/** Common structure for the configuration information interface. */
89	VDINTERFACE VDIConfig;
90	} VBOXIMAGE, *PVBOXIMAGE;
91
92	/**
93	* VBox disk container media main structure, private part.
94	*/
95	typedef struct VBOXDISK
96	{
97	/** The VBox disk container. */
98	PVBOXHDD pDisk;
99	/** The media interface. */
100	PDMIMEDIA IMedia;
101	/** Pointer to the driver instance. */
102	PPDMDRVINS pDrvIns;
103	/** Flag whether suspend has changed image open mode to read only. */
104	bool fTempReadOnly;
105	/** Pointer to list of VD interfaces. Per-disk. */
106	PVDINTERFACE pVDIfsDisk;
107	/** Common structure for the supported error interface. */
108	VDINTERFACE VDIError;
109	/** Callback table for error interface. */
110	VDINTERFACEERROR VDIErrorCallbacks;
111	/** Common structure for the supported async I/O interface. */
112	VDINTERFACE VDIAsyncIO;
113	/** Callback table for async I/O interface. */
114	VDINTERFACEASYNCIO VDIAsyncIOCallbacks;
115	/** Callback table for the configuration information interface. */
116	VDINTERFACECONFIG VDIConfigCallbacks;
117	/** Flag whether opened disk suppports async I/O operations. */
118	bool fAsyncIOSupported;
119	/** The async media interface. */
120	PDMIMEDIAASYNC IMediaAsync;
121	/** The async media port interface above. */
122	PPDMIMEDIAASYNCPORT pDrvMediaAsyncPort;
123	/** Pointer to the asynchronous media driver below. */
124	PPDMITRANSPORTASYNC pDrvTransportAsync;
125	/** Async transport port interface. */
126	PDMITRANSPORTASYNCPORT ITransportAsyncPort;
127	/** Our cache to reduce allocation overhead. */
128	PRTOBJCACHE pCache;
129	/** Pointer to the list of data we need to keep per image. */
130	PVBOXIMAGE pImages;
131	} VBOXDISK, *PVBOXDISK;
132
133	/*******************************************************************************
134	* Error reporting callback *
135	*******************************************************************************/
136
137	static void drvvdErrorCallback(void *pvUser, int rc, RT_SRC_POS_DECL,
138	const char *pszFormat, va_list va)
139	{
140	PPDMDRVINS pDrvIns = (PPDMDRVINS)pvUser;
141	pDrvIns->pDrvHlp->pfnVMSetErrorV(pDrvIns, rc, RT_SRC_POS_ARGS, pszFormat, va);
142	}
143
144
145	/**
146	* Internal: allocate new image descriptor and put it in the list
147	*/
148	static PVBOXIMAGE drvvdNewImage(PVBOXDISK pThis)
149	{
150	AssertPtr(pThis);
151	PVBOXIMAGE pImage = (PVBOXIMAGE)RTMemAllocZ(sizeof(VBOXIMAGE));
152	if (pImage)
153	{
154	pImage->pVDIfsImage = NULL;
155	PVBOXIMAGE *pp = &pThis->pImages;
156	while (*pp != NULL)
157	pp = &(*pp)->pNext;
158	*pp = pImage;
159	pImage->pNext = NULL;
160	}
161
162	return pImage;
163	}
164
165	/**
166	* Internal: free the list of images descriptors.
167	*/
168	static void drvvdFreeImages(PVBOXDISK pThis)
169	{
170	while (pThis->pImages != NULL)
171	{
172	PVBOXIMAGE p = pThis->pImages;
173	pThis->pImages = pThis->pImages->pNext;
174	RTMemFree(p);
175	}
176	}
177
178	/*******************************************************************************
179	* VD Async I/O interface implementation *
180	*******************************************************************************/
181
182	static DECLCALLBACK(int) drvvdAsyncIOOpen(void pvUser, const char pszLocation, bool fReadonly, void **ppStorage)
183	{
184	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
185
186	return pDrvVD->pDrvTransportAsync->pfnOpen(pDrvVD->pDrvTransportAsync, pszLocation, fReadonly, ppStorage);
187	}
188
189	static DECLCALLBACK(int) drvvdAsyncIOClose(void pvUser, void pStorage)
190	{
191	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
192
193	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
194
195	return pDrvVD->pDrvTransportAsync->pfnClose(pDrvVD->pDrvTransportAsync, pStorage);
196	}
197
198	static DECLCALLBACK(int) drvvdAsyncIORead(void pvUser, void pStorage, uint64_t uOffset,
199	size_t cbRead, void pvBuf, size_t pcbRead)
200	{
201	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
202
203	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
204
205	return pDrvVD->pDrvTransportAsync->pfnReadSynchronous(pDrvVD->pDrvTransportAsync,
206	pStorage,
207	uOffset, pvBuf, cbRead, pcbRead);
208	}
209
210	static DECLCALLBACK(int) drvvdAsyncIOWrite(void pvUser, void pStorage, uint64_t uOffset,
211	size_t cbWrite, const void pvBuf, size_t pcbWritten)
212	{
213	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
214
215	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
216
217	return pDrvVD->pDrvTransportAsync->pfnWriteSynchronous(pDrvVD->pDrvTransportAsync,
218	pStorage,
219	uOffset, pvBuf, cbWrite, pcbWritten);
220	}
221
222	static DECLCALLBACK(int) drvvdAsyncIOFlush(void pvUser, void pStorage)
223	{
224	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
225
226	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
227
228	return pDrvVD->pDrvTransportAsync->pfnFlushSynchronous(pDrvVD->pDrvTransportAsync, pStorage);
229	}
230
231	static DECLCALLBACK(int) drvvdAsyncIOPrepareRead(void pvUser, void pStorage, uint64_t uOffset, void pvBuf, size_t cbRead, void *ppTask)
232	{
233	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
234
235	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
236
237	return pDrvVD->pDrvTransportAsync->pfnPrepareRead(pDrvVD->pDrvTransportAsync, pStorage, uOffset, pvBuf, cbRead, ppTask);
238	}
239
240	static DECLCALLBACK(int) drvvdAsyncIOPrepareWrite(void pvUser, void pStorage, uint64_t uOffset, void pvBuf, size_t cbWrite, void *ppTask)
241	{
242	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
243
244	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
245
246	return pDrvVD->pDrvTransportAsync->pfnPrepareWrite(pDrvVD->pDrvTransportAsync, pStorage, uOffset, pvBuf, cbWrite, ppTask);
247	}
248
249	static DECLCALLBACK(int) drvvdAsyncIOTasksSubmit(void pvUser, void apTasks[], unsigned cTasks, void *pvUser2,
250	void *pvUserCaller, PFNVDCOMPLETED pfnTasksCompleted)
251	{
252	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
253	PDRVVDASYNCTASK pDrvVDAsyncTask;
254	int rc;
255
256	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
257
258	rc = RTCacheRequest(pDrvVD->pCache, (void **)&pDrvVDAsyncTask);
259
260	if (RT_FAILURE(rc))
261	return rc;
262
263	pDrvVDAsyncTask->pfnCompleted = pfnTasksCompleted;
264	pDrvVDAsyncTask->pvUser = pvUser2;
265	pDrvVDAsyncTask->pvUserCaller = pvUserCaller;
266
267	return pDrvVD->pDrvTransportAsync->pfnTasksSubmit(pDrvVD->pDrvTransportAsync, apTasks, cTasks, pDrvVDAsyncTask);
268	}
269
270	/*******************************************************************************
271	* VD Configuration interface implementation *
272	*******************************************************************************/
273
274	static bool drvvdCfgAreValuesValid(PVDCFGNODE pNode, const char *pszzValid)
275	{
276	return CFGMR3AreValuesValid((PCFGMNODE)pNode, pszzValid);
277	}
278
279	static int drvvdCfgQueryType(PVDCFGNODE pNode, const char *pszName, PVDCFGVALUETYPE penmType)
280	{
281	Assert(VDCFGVALUETYPE_INTEGER == (VDCFGVALUETYPE)CFGMVALUETYPE_INTEGER);
282	Assert(VDCFGVALUETYPE_STRING == (VDCFGVALUETYPE)CFGMVALUETYPE_STRING);
283	Assert(VDCFGVALUETYPE_BYTES == (VDCFGVALUETYPE)CFGMVALUETYPE_BYTES);
284	return CFGMR3QueryType((PCFGMNODE)pNode, pszName, (PCFGMVALUETYPE)penmType);
285	}
286
287	static int drvvdCfgQuerySize(PVDCFGNODE pNode, const char pszName, size_t pcb)
288	{
289	return CFGMR3QuerySize((PCFGMNODE)pNode, pszName, pcb);
290	}
291
292	static int drvvdCfgQueryInteger(PVDCFGNODE pNode, const char pszName, uint64_t pu64)
293	{
294	return CFGMR3QueryInteger((PCFGMNODE)pNode, pszName, pu64);
295	}
296
297	static int drvvdCfgQueryIntegerDef(PVDCFGNODE pNode, const char pszName, uint64_t pu64, uint64_t u64Def)
298	{
299	return CFGMR3QueryInteger((PCFGMNODE)pNode, pszName, pu64);
300	}
301
302	static int drvvdCfgQueryString(PVDCFGNODE pNode, const char pszName, char pszString, size_t cchString)
303	{
304	return CFGMR3QueryString((PCFGMNODE)pNode, pszName, pszString, cchString);
305	}
306
307	static int drvvdCfgQueryStringDef(PVDCFGNODE pNode, const char pszName, char pszString, size_t cchString, const char *pszDef)
308	{
309	return CFGMR3QueryStringDef((PCFGMNODE)pNode, pszName, pszString, cchString, pszDef);
310	}
311
312	static int drvvdCfgQueryBytes(PVDCFGNODE pNode, const char pszName, void pvData, size_t cbData)
313	{
314	return CFGMR3QueryBytes((PCFGMNODE)pNode, pszName, pvData, cbData);
315	}
316
317
318	/*******************************************************************************
319	* Media interface methods *
320	*******************************************************************************/
321
322	/** @copydoc PDMIMEDIA::pfnRead */
323	static DECLCALLBACK(int) drvvdRead(PPDMIMEDIA pInterface,
324	uint64_t off, void *pvBuf, size_t cbRead)
325	{
326	LogFlow(("%s: off=%#llx pvBuf=%p cbRead=%d\n", __FUNCTION__,
327	off, pvBuf, cbRead));
328	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
329	int rc = VDRead(pThis->pDisk, off, pvBuf, cbRead);
330	if (RT_SUCCESS(rc))
331	Log2(("%s: off=%#llx pvBuf=%p cbRead=%d %.*Vhxd\n", __FUNCTION__,
332	off, pvBuf, cbRead, cbRead, pvBuf));
333	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
334	return rc;
335	}
336
337	/** @copydoc PDMIMEDIA::pfnWrite */
338	static DECLCALLBACK(int) drvvdWrite(PPDMIMEDIA pInterface,
339	uint64_t off, const void *pvBuf,
340	size_t cbWrite)
341	{
342	LogFlow(("%s: off=%#llx pvBuf=%p cbWrite=%d\n", __FUNCTION__,
343	off, pvBuf, cbWrite));
344	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
345	Log2(("%s: off=%#llx pvBuf=%p cbWrite=%d %.*Vhxd\n", __FUNCTION__,
346	off, pvBuf, cbWrite, cbWrite, pvBuf));
347	int rc = VDWrite(pThis->pDisk, off, pvBuf, cbWrite);
348	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
349	return rc;
350	}
351
352	/** @copydoc PDMIMEDIA::pfnFlush */
353	static DECLCALLBACK(int) drvvdFlush(PPDMIMEDIA pInterface)
354	{
355	LogFlow(("%s:\n", __FUNCTION__));
356	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
357	int rc = VDFlush(pThis->pDisk);
358	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
359	return rc;
360	}
361
362	/** @copydoc PDMIMEDIA::pfnGetSize */
363	static DECLCALLBACK(uint64_t) drvvdGetSize(PPDMIMEDIA pInterface)
364	{
365	LogFlow(("%s:\n", __FUNCTION__));
366	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
367	uint64_t cb = VDGetSize(pThis->pDisk, VD_LAST_IMAGE);
368	LogFlow(("%s: returns %#llx (%llu)\n", __FUNCTION__, cb, cb));
369	return cb;
370	}
371
372	/** @copydoc PDMIMEDIA::pfnIsReadOnly */
373	static DECLCALLBACK(bool) drvvdIsReadOnly(PPDMIMEDIA pInterface)
374	{
375	LogFlow(("%s:\n", __FUNCTION__));
376	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
377	bool f = VDIsReadOnly(pThis->pDisk);
378	LogFlow(("%s: returns %d\n", __FUNCTION__, f));
379	return f;
380	}
381
382	/** @copydoc PDMIMEDIA::pfnBiosGetPCHSGeometry */
383	static DECLCALLBACK(int) drvvdBiosGetPCHSGeometry(PPDMIMEDIA pInterface,
384	PPDMMEDIAGEOMETRY pPCHSGeometry)
385	{
386	LogFlow(("%s:\n", __FUNCTION__));
387	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
388	int rc = VDGetPCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pPCHSGeometry);
389	if (RT_FAILURE(rc))
390	{
391	Log(("%s: geometry not available.\n", __FUNCTION__));
392	rc = VERR_PDM_GEOMETRY_NOT_SET;
393	}
394	LogFlow(("%s: returns %Rrc (CHS=%d/%d/%d)\n", __FUNCTION__,
395	rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
396	return rc;
397	}
398
399	/** @copydoc PDMIMEDIA::pfnBiosSetPCHSGeometry */
400	static DECLCALLBACK(int) drvvdBiosSetPCHSGeometry(PPDMIMEDIA pInterface,
401	PCPDMMEDIAGEOMETRY pPCHSGeometry)
402	{
403	LogFlow(("%s: CHS=%d/%d/%d\n", __FUNCTION__,
404	pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
405	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
406	int rc = VDSetPCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pPCHSGeometry);
407	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
408	return rc;
409	}
410
411	/** @copydoc PDMIMEDIA::pfnBiosGetLCHSGeometry */
412	static DECLCALLBACK(int) drvvdBiosGetLCHSGeometry(PPDMIMEDIA pInterface,
413	PPDMMEDIAGEOMETRY pLCHSGeometry)
414	{
415	LogFlow(("%s:\n", __FUNCTION__));
416	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
417	int rc = VDGetLCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pLCHSGeometry);
418	if (RT_FAILURE(rc))
419	{
420	Log(("%s: geometry not available.\n", __FUNCTION__));
421	rc = VERR_PDM_GEOMETRY_NOT_SET;
422	}
423	LogFlow(("%s: returns %Rrc (CHS=%d/%d/%d)\n", __FUNCTION__,
424	rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
425	return rc;
426	}
427
428	/** @copydoc PDMIMEDIA::pfnBiosSetLCHSGeometry */
429	static DECLCALLBACK(int) drvvdBiosSetLCHSGeometry(PPDMIMEDIA pInterface,
430	PCPDMMEDIAGEOMETRY pLCHSGeometry)
431	{
432	LogFlow(("%s: CHS=%d/%d/%d\n", __FUNCTION__,
433	pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
434	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
435	int rc = VDSetLCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pLCHSGeometry);
436	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
437	return rc;
438	}
439
440	/** @copydoc PDMIMEDIA::pfnGetUuid */
441	static DECLCALLBACK(int) drvvdGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid)
442	{
443	LogFlow(("%s:\n", __FUNCTION__));
444	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
445	int rc = VDGetUuid(pThis->pDisk, 0, pUuid);
446	LogFlow(("%s: returns %Rrc ({%RTuuid})\n", __FUNCTION__, rc, pUuid));
447	return rc;
448	}
449
450	/*******************************************************************************
451	* Async Media interface methods *
452	*******************************************************************************/
453
454	static DECLCALLBACK(int) drvvdStartRead(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
455	PPDMDATASEG paSeg, unsigned cSeg,
456	size_t cbRead, void *pvUser)
457	{
458	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbRead=%d\n pvUser=%#p", __FUNCTION__,
459	uOffset, paSeg, cSeg, cbRead, pvUser));
460	PVBOXDISK pThis = PDMIMEDIAASYNC_2_VBOXDISK(pInterface);
461	int rc = VDAsyncRead(pThis->pDisk, uOffset, cbRead, paSeg, cSeg, pvUser);
462	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
463	return rc;
464	}
465
466	static DECLCALLBACK(int) drvvdStartWrite(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
467	PPDMDATASEG paSeg, unsigned cSeg,
468	size_t cbWrite, void *pvUser)
469	{
470	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbWrite=%d\n pvUser=%#p", __FUNCTION__,
471	uOffset, paSeg, cSeg, cbWrite, pvUser));
472	PVBOXDISK pThis = PDMIMEDIAASYNC_2_VBOXDISK(pInterface);
473	int rc = VDAsyncWrite(pThis->pDisk, uOffset, cbWrite, paSeg, cSeg, pvUser);
474	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
475	return rc;
476	}
477
478	/*******************************************************************************
479	* Async transport port interface methods *
480	*******************************************************************************/
481
482	static DECLCALLBACK(int) drvvdTasksCompleteNotify(PPDMITRANSPORTASYNCPORT pInterface, void *pvUser)
483	{
484	PVBOXDISK pThis = PDMITRANSPORTASYNCPORT_2_VBOXDISK(pInterface);
485	PDRVVDASYNCTASK pDrvVDAsyncTask = (PDRVVDASYNCTASK)pvUser;
486	int rc = VINF_VDI_ASYNC_IO_FINISHED;
487
488	/* Having a completion callback for a task is not mandatory. */
489	if (pDrvVDAsyncTask->pfnCompleted)
490	rc = pDrvVDAsyncTask->pfnCompleted(pDrvVDAsyncTask->pvUser);
491
492	/* Check if the request is finished. */
493	if (rc == VINF_VDI_ASYNC_IO_FINISHED)
494	{
495	rc = pThis->pDrvMediaAsyncPort->pfnTransferCompleteNotify(pThis->pDrvMediaAsyncPort, pDrvVDAsyncTask->pvUserCaller);
496	}
497	else if (rc == VERR_VDI_ASYNC_IO_IN_PROGRESS)
498	rc = VINF_SUCCESS;
499
500	rc = RTCacheInsert(pThis->pCache, pDrvVDAsyncTask);
501	AssertRC(rc);
502
503	return rc;
504	}
505
506
507	/*******************************************************************************
508	* Base interface methods *
509	*******************************************************************************/
510
511	/** @copydoc PDMIBASE::pfnQueryInterface */
512	static DECLCALLBACK(void *) drvvdQueryInterface(PPDMIBASE pInterface,
513	PDMINTERFACE enmInterface)
514	{
515	PPDMDRVINS pDrvIns = PDMIBASE_2_DRVINS(pInterface);
516	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
517	switch (enmInterface)
518	{
519	case PDMINTERFACE_BASE:
520	return &pDrvIns->IBase;
521	case PDMINTERFACE_MEDIA:
522	return &pThis->IMedia;
523	case PDMINTERFACE_MEDIA_ASYNC:
524	return pThis->fAsyncIOSupported ? &pThis->IMediaAsync : NULL;
525	case PDMINTERFACE_TRANSPORT_ASYNC_PORT:
526	return &pThis->ITransportAsyncPort;
527	default:
528	return NULL;
529	}
530	}
531
532
533	/*******************************************************************************
534	* Driver methods *
535	*******************************************************************************/
536
537
538	/**
539	* Construct a VBox disk media driver instance.
540	*
541	* @returns VBox status.
542	* @param pDrvIns The driver instance data.
543	* If the registration structure is needed, pDrvIns->pDrvReg points to it.
544	* @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration
545	* of the driver instance. It's also found in pDrvIns->pCfgHandle as it's expected
546	* to be used frequently in this function.
547	*/
548	static DECLCALLBACK(int) drvvdConstruct(PPDMDRVINS pDrvIns,
549	PCFGMNODE pCfgHandle)
550	{
551	LogFlow(("%s:\n", __FUNCTION__));
552	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
553	int rc = VINF_SUCCESS;
554	char pszName = NULL; /< The path of the disk image file. /
555	char pszFormat = NULL; /< The format backed to use for this image. /
556	bool fReadOnly; /*< True if the media is readonly. /
557	bool fHonorZeroWrites; /*< True if zero blocks should be written. /
558
559	/*
560	* Init the static parts.
561	*/
562	pDrvIns->IBase.pfnQueryInterface = drvvdQueryInterface;
563	pThis->pDrvIns = pDrvIns;
564	pThis->fTempReadOnly = false;
565	pThis->pDisk = NULL;
566	pThis->fAsyncIOSupported = false;
567
568	/* IMedia */
569	pThis->IMedia.pfnRead = drvvdRead;
570	pThis->IMedia.pfnWrite = drvvdWrite;
571	pThis->IMedia.pfnFlush = drvvdFlush;
572	pThis->IMedia.pfnGetSize = drvvdGetSize;
573	pThis->IMedia.pfnIsReadOnly = drvvdIsReadOnly;
574	pThis->IMedia.pfnBiosGetPCHSGeometry = drvvdBiosGetPCHSGeometry;
575	pThis->IMedia.pfnBiosSetPCHSGeometry = drvvdBiosSetPCHSGeometry;
576	pThis->IMedia.pfnBiosGetLCHSGeometry = drvvdBiosGetLCHSGeometry;
577	pThis->IMedia.pfnBiosSetLCHSGeometry = drvvdBiosSetLCHSGeometry;
578	pThis->IMedia.pfnGetUuid = drvvdGetUuid;
579
580	/* IMediaAsync */
581	pThis->IMediaAsync.pfnStartRead = drvvdStartRead;
582	pThis->IMediaAsync.pfnStartWrite = drvvdStartWrite;
583
584	/* ITransportAsyncPort */
585	pThis->ITransportAsyncPort.pfnTaskCompleteNotify = drvvdTasksCompleteNotify;
586
587	/* Initialize supported VD interfaces. */
588	pThis->pVDIfsDisk = NULL;
589
590	pThis->VDIErrorCallbacks.cbSize = sizeof(VDINTERFACEERROR);
591	pThis->VDIErrorCallbacks.enmInterface = VDINTERFACETYPE_ERROR;
592	pThis->VDIErrorCallbacks.pfnError = drvvdErrorCallback;
593
594	rc = VDInterfaceAdd(&pThis->VDIError, "DrvVD_VDIError", VDINTERFACETYPE_ERROR,
595	&pThis->VDIErrorCallbacks, pDrvIns, &pThis->pVDIfsDisk);
596	AssertRC(rc);
597
598	pThis->VDIAsyncIOCallbacks.cbSize = sizeof(VDINTERFACEASYNCIO);
599	pThis->VDIAsyncIOCallbacks.enmInterface = VDINTERFACETYPE_ASYNCIO;
600	pThis->VDIAsyncIOCallbacks.pfnOpen = drvvdAsyncIOOpen;
601	pThis->VDIAsyncIOCallbacks.pfnClose = drvvdAsyncIOClose;
602	pThis->VDIAsyncIOCallbacks.pfnRead = drvvdAsyncIORead;
603	pThis->VDIAsyncIOCallbacks.pfnWrite = drvvdAsyncIOWrite;
604	pThis->VDIAsyncIOCallbacks.pfnFlush = drvvdAsyncIOFlush;
605	pThis->VDIAsyncIOCallbacks.pfnPrepareRead = drvvdAsyncIOPrepareRead;
606	pThis->VDIAsyncIOCallbacks.pfnPrepareWrite = drvvdAsyncIOPrepareWrite;
607	pThis->VDIAsyncIOCallbacks.pfnTasksSubmit = drvvdAsyncIOTasksSubmit;
608
609	rc = VDInterfaceAdd(&pThis->VDIAsyncIO, "DrvVD_AsyncIO", VDINTERFACETYPE_ASYNCIO,
610	&pThis->VDIAsyncIOCallbacks, pThis, &pThis->pVDIfsDisk);
611	AssertRC(rc);
612
613	/* This is just prepared here, the actual interface is per-image, so it's
614	* added later. No need to have separate callback tables. */
615	pThis->VDIConfigCallbacks.cbSize = sizeof(VDINTERFACECONFIG);
616	pThis->VDIConfigCallbacks.enmInterface = VDINTERFACETYPE_CONFIG;
617	pThis->VDIConfigCallbacks.pfnAreValuesValid = drvvdCfgAreValuesValid;
618	pThis->VDIConfigCallbacks.pfnQueryType = drvvdCfgQueryType;
619	pThis->VDIConfigCallbacks.pfnQuerySize = drvvdCfgQuerySize;
620	pThis->VDIConfigCallbacks.pfnQueryInteger = drvvdCfgQueryInteger;
621	pThis->VDIConfigCallbacks.pfnQueryIntegerDef = drvvdCfgQueryIntegerDef;
622	pThis->VDIConfigCallbacks.pfnQueryString = drvvdCfgQueryString;
623	pThis->VDIConfigCallbacks.pfnQueryStringDef = drvvdCfgQueryStringDef;
624	pThis->VDIConfigCallbacks.pfnQueryBytes = drvvdCfgQueryBytes;
625
626	/* List of images is empty now. */
627	pThis->pImages = NULL;
628
629	/* Try to attach async media port interface above.*/
630	pThis->pDrvMediaAsyncPort = (PPDMIMEDIAASYNCPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_MEDIA_ASYNC_PORT);
631
632	/*
633	* Attach the async transport driver below of the device above us implements the
634	* async interface.
635	*/
636	if (pThis->pDrvMediaAsyncPort)
637	{
638	/* Try to attach the driver. */
639	PPDMIBASE pBase;
640
641	rc = pDrvIns->pDrvHlp->pfnAttach(pDrvIns, &pBase);
642	if (rc == VERR_PDM_NO_ATTACHED_DRIVER)
643	{
644	/*
645	* Though the device supports async I/O there is no transport driver
646	* which processes async requests.
647	* Revert to non async I/O.
648	*/
649	rc = VINF_SUCCESS;
650	pThis->pDrvMediaAsyncPort = NULL;
651	pThis->fAsyncIOSupported = false;
652	}
653	else if (RT_FAILURE(rc))
654	{
655	AssertMsgFailed(("Failed to attach async transport driver below rc=%Rrc\n", rc));
656	}
657	else
658	{
659	/*
660	* The device supports async I/O and we successfully attached the transport driver.
661	* Indicate that async I/O is supported for now as we check if the image backend supports
662	* it later.
663	*/
664	pThis->fAsyncIOSupported = true;
665
666	/* Success query the async transport interface. */
667	pThis->pDrvTransportAsync = (PPDMITRANSPORTASYNC)pBase->pfnQueryInterface(pBase, PDMINTERFACE_TRANSPORT_ASYNC);
668	if (!pThis->pDrvTransportAsync)
669	{
670	/* An attached driver without an async transport interface - impossible. */
671	AssertMsgFailed(("Configuration error: No async transport interface below!\n"));
672	return VERR_PDM_MISSING_INTERFACE_ABOVE;
673	}
674	}
675	}
676
677	/*
678	* Validate configuration and find all parent images.
679	* It's sort of up side down from the image dependency tree.
680	*/
681	unsigned iLevel = 0;
682	PCFGMNODE pCurNode = pCfgHandle;
683
684	for (;;)
685	{
686	bool fValid;
687
688	if (pCurNode == pCfgHandle)
689	{
690	/* Toplevel configuration additionally contains the global image
691	* open flags. Some might be converted to per-image flags later. */
692	fValid = CFGMR3AreValuesValid(pCurNode,
693	"Format\0Path\0"
694	"ReadOnly\0HonorZeroWrites\0");
695	}
696	else
697	{
698	/* All other image configurations only contain image name and
699	* the format information. */
700	fValid = CFGMR3AreValuesValid(pCurNode, "Format\0Path\0");
701	}
702	if (!fValid)
703	{
704	rc = PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
705	RT_SRC_POS, N_("DrvVD: Configuration error: keys incorrect at level %d"), iLevel);
706	break;
707	}
708
709	PCFGMNODE pParent = CFGMR3GetChild(pCurNode, "Parent");
710	if (!pParent)
711	break;
712	pCurNode = pParent;
713	iLevel++;
714	}
715
716	/*
717	* Open the images.
718	*/
719	if (RT_SUCCESS(rc))
720	{
721	rc = VDCreate(pThis->pVDIfsDisk, &pThis->pDisk);
722	/* Error message is already set correctly. */
723	}
724
725	while (pCurNode && RT_SUCCESS(rc))
726	{
727	/* Allocate per-image data. */
728	PVBOXIMAGE pImage = drvvdNewImage(pThis);
729	if (!pImage)
730	{
731	rc = VERR_NO_MEMORY;
732	break;
733	}
734
735	/*
736	* Read the image configuration.
737	*/
738	rc = CFGMR3QueryStringAlloc(pCurNode, "Path", &pszName);
739	if (RT_FAILURE(rc))
740	{
741	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
742	N_("DrvVD: Configuration error: Querying \"Path\" as string failed"));
743	break;
744	}
745
746	rc = CFGMR3QueryStringAlloc(pCfgHandle, "Format", &pszFormat);
747	if (RT_FAILURE(rc))
748	{
749	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
750	N_("DrvVD: Configuration error: Querying \"Format\" as string failed"));
751	break;
752	}
753
754	if (iLevel == 0)
755	{
756	rc = CFGMR3QueryBool(pCurNode, "ReadOnly", &fReadOnly);
757	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
758	fReadOnly = false;
759	else if (RT_FAILURE(rc))
760	{
761	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
762	N_("DrvVD: Configuration error: Querying \"ReadOnly\" as boolean failed"));
763	break;
764	}
765
766	rc = CFGMR3QueryBool(pCfgHandle, "HonorZeroWrites", &fHonorZeroWrites);
767	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
768	fHonorZeroWrites = false;
769	else if (RT_FAILURE(rc))
770	{
771	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
772	N_("DrvVD: Configuration error: Querying \"HonorZeroWrites\" as boolean failed"));
773	break;
774	}
775	}
776	else
777	{
778	fReadOnly = true;
779	fHonorZeroWrites = false;
780	}
781
782	PCFGMNODE pCfg = CFGMR3GetChild(pCurNode, "VDConfig");
783	rc = VDInterfaceAdd(&pImage->VDIConfig, "DrvVD_Config", VDINTERFACETYPE_CONFIG,
784	&pThis->VDIConfigCallbacks, pCfg, &pImage->pVDIfsImage);
785	AssertRC(rc);
786
787	/*
788	* Open the image.
789	*/
790	unsigned uOpenFlags;
791	if (fReadOnly)
792	uOpenFlags = VD_OPEN_FLAGS_READONLY;
793	else
794	uOpenFlags = VD_OPEN_FLAGS_NORMAL;
795	if (fHonorZeroWrites)
796	uOpenFlags \|= VD_OPEN_FLAGS_HONOR_ZEROES;
797	if (pThis->pDrvMediaAsyncPort)
798	uOpenFlags \|= VD_OPEN_FLAGS_ASYNC_IO;
799
800	/** Try to open backend in asyc I/O mode first. */
801	rc = VDOpen(pThis->pDisk, pszFormat, pszName, uOpenFlags, pImage->pVDIfsImage);
802	if (rc == VERR_NOT_SUPPORTED)
803	{
804	/* Seems async I/O is not supported by the backend, open in normal mode. */
805	uOpenFlags &= ~VD_OPEN_FLAGS_ASYNC_IO;
806	rc = VDOpen(pThis->pDisk, pszFormat, pszName, uOpenFlags, pImage->pVDIfsImage);
807	}
808
809	if (RT_SUCCESS(rc))
810	Log(("%s: %d - Opened '%s' in %s mode\n", __FUNCTION__,
811	iLevel, pszName,
812	VDIsReadOnly(pThis->pDisk) ? "read-only" : "read-write"));
813	else
814	{
815	AssertMsgFailed(("Failed to open image '%s' rc=%Rrc\n", pszName, rc));
816	break;
817	}
818
819
820	MMR3HeapFree(pszName);
821	pszName = NULL;
822	MMR3HeapFree(pszFormat);
823	pszFormat = NULL;
824
825	/* next */
826	iLevel--;
827	pCurNode = CFGMR3GetParent(pCurNode);
828	}
829
830	if (RT_FAILURE(rc))
831	{
832	if (VALID_PTR(pThis->pDisk))
833	{
834	VDDestroy(pThis->pDisk);
835	pThis->pDisk = NULL;
836	}
837	drvvdFreeImages(pThis);
838	if (VALID_PTR(pszName))
839	MMR3HeapFree(pszName);
840	if (VALID_PTR(pszFormat))
841	MMR3HeapFree(pszFormat);
842
843	return rc;
844	}
845	else
846	{
847	/*
848	* Check if every opened image supports async I/O.
849	* If not we revert to non async I/O.
850	*/
851	if (pThis->fAsyncIOSupported)
852	{
853	for (unsigned i = 0; i < VDGetCount(pThis->pDisk); i++)
854	{
855	VDBACKENDINFO vdBackendInfo;
856
857	rc = VDBackendInfoSingle(pThis->pDisk, i, &vdBackendInfo);
858	AssertRC(rc);
859
860	if (vdBackendInfo.uBackendCaps & VD_CAP_ASYNC)
861	{
862	/*
863	* Backend indicates support for at least some files.
864	* Check if current file is supported with async I/O)
865	*/
866	rc = VDImageIsAsyncIOSupported(pThis->pDisk, i, &pThis->fAsyncIOSupported);
867	AssertRC(rc);
868
869	/*
870	* Check if current image is supported.
871	* If not we can stop checking because
872	* at least one does not support it.
873	*/
874	if (!pThis->fAsyncIOSupported)
875	break;
876	}
877	else
878	{
879	pThis->fAsyncIOSupported = false;
880	break;
881	}
882	}
883	}
884
885	/*
886	* We know definitly if async I/O is supported now.
887	* Create cache if it is supported.
888	*/
889	if (pThis->fAsyncIOSupported)
890	{
891	rc = RTCacheCreate(&pThis->pCache, 0, sizeof(DRVVDASYNCTASK), RTOBJCACHE_PROTECT_INSERT);
892	AssertMsg(RT_SUCCESS(rc), ("Failed to create cache rc=%Rrc\n", rc));
893	}
894	}
895
896	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
897	return rc;
898	}
899
900	/**
901	* Destruct a driver instance.
902	*
903	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
904	* resources can be freed correctly.
905	*
906	* @param pDrvIns The driver instance data.
907	*/
908	static DECLCALLBACK(void) drvvdDestruct(PPDMDRVINS pDrvIns)
909	{
910	int rc;
911	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
912	LogFlow(("%s:\n", __FUNCTION__));
913
914	drvvdFreeImages(pThis);
915	if (pThis->pCache)
916	{
917	rc = RTCacheDestroy(pThis->pCache);
918	AssertRC(rc);
919	}
920	}
921
922
923	/**
924	* When the VM has been suspended we'll change the image mode to read-only
925	* so that main and others can read the VDIs. This is important when
926	* saving state and so forth.
927	*
928	* @param pDrvIns The driver instance data.
929	*/
930	static DECLCALLBACK(void) drvvdSuspend(PPDMDRVINS pDrvIns)
931	{
932	LogFlow(("%s:\n", __FUNCTION__));
933	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
934	if (!VDIsReadOnly(pThis->pDisk))
935	{
936	unsigned uOpenFlags;
937	int rc = VDGetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, &uOpenFlags);
938	AssertRC(rc);
939	uOpenFlags \|= VD_OPEN_FLAGS_READONLY;
940	rc = VDSetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, uOpenFlags);
941	AssertRC(rc);
942	pThis->fTempReadOnly = true;
943	}
944	}
945
946	/**
947	* Before the VM resumes we'll have to undo the read-only mode change
948	* done in drvvdSuspend.
949	*
950	* @param pDrvIns The driver instance data.
951	*/
952	static DECLCALLBACK(void) drvvdResume(PPDMDRVINS pDrvIns)
953	{
954	LogFlow(("%s:\n", __FUNCTION__));
955	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
956	if (pThis->fTempReadOnly)
957	{
958	unsigned uOpenFlags;
959	int rc = VDGetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, &uOpenFlags);
960	AssertRC(rc);
961	uOpenFlags &= ~VD_OPEN_FLAGS_READONLY;
962	rc = VDSetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, uOpenFlags);
963	AssertRC(rc);
964	pThis->fTempReadOnly = false;
965	}
966	}
967
968	static DECLCALLBACK(void) drvvdPowerOff(PPDMDRVINS pDrvIns)
969	{
970	LogFlow(("%s:\n", __FUNCTION__));
971	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
972
973	/*
974	* We must close the disk here to ensure that
975	* the backend closes all files before the
976	* async transport driver is destructed.
977	*/
978	int rc = VDCloseAll(pThis->pDisk);
979	AssertRC(rc);
980	}
981
982	/**
983	* VBox disk container media driver registration record.
984	*/
985	const PDMDRVREG g_DrvVD =
986	{
987	/* u32Version */
988	PDM_DRVREG_VERSION,
989	/* szDriverName */
990	"VD",
991	/* pszDescription */
992	"Generic VBox disk media driver.",
993	/* fFlags */
994	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
995	/* fClass. */
996	PDM_DRVREG_CLASS_MEDIA,
997	/* cMaxInstances */
998	~0,
999	/* cbInstance */
1000	sizeof(VBOXDISK),
1001	/* pfnConstruct */
1002	drvvdConstruct,
1003	/* pfnDestruct */
1004	drvvdDestruct,
1005	/* pfnIOCtl */
1006	NULL,
1007	/* pfnPowerOn */
1008	NULL,
1009	/* pfnReset */
1010	NULL,
1011	/* pfnSuspend */
1012	drvvdSuspend,
1013	/* pfnResume */
1014	drvvdResume,
1015	/* pfnDetach */
1016	NULL,
1017	/* pfnPowerOff */
1018	drvvdPowerOff
1019	};

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source: vbox/trunk/src/VBox/Devices/Storage/DrvVD.cpp@ 12559

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