DrvVD.cpp@ 11287

Last change on this file since 11287 was 11287, checked in by vboxsync, 16 years ago
Devices: %Vuuid -> %RTuuid (just preferred, not mandatory (yet))
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 34.9 KB

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1	/** $Id: DrvVD.cpp 11287 2008-08-08 22:35:40Z 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 media main structure, private part.
80	*/
81	typedef struct VBOXDISK
82	{
83	/** The VBox disk container. */
84	PVBOXHDD pDisk;
85	/** The media interface. */
86	PDMIMEDIA IMedia;
87	/** Pointer to the driver instance. */
88	PPDMDRVINS pDrvIns;
89	/** Flag whether suspend has changed image open mode to read only. */
90	bool fTempReadOnly;
91	/** Common structure for the supported error interface. */
92	VDINTERFACE VDIError;
93	/** Callback table for error interface. */
94	VDINTERFACEERROR VDIErrorCallbacks;
95	/** Common structure for the supported async I/O interface. */
96	VDINTERFACE VDIAsyncIO;
97	/** Callback table for async I/O interface. */
98	VDINTERFACEASYNCIO VDIAsyncIOCallbacks;
99	/** Common structure for the configuration information interface. */
100	VDINTERFACE VDIConfig;
101	/** Callback table for the configuration information interface. */
102	VDINTERFACECONFIG VDIConfigCallbacks;
103	/** Flag whether opened disk suppports async I/O operations. */
104	bool fAsyncIOSupported;
105	/** The async media interface. */
106	PDMIMEDIAASYNC IMediaAsync;
107	/** The async media port interface above. */
108	PPDMIMEDIAASYNCPORT pDrvMediaAsyncPort;
109	/** Pointer to the asynchronous media driver below. */
110	PPDMITRANSPORTASYNC pDrvTransportAsync;
111	/** Async transport port interface. */
112	PDMITRANSPORTASYNCPORT ITransportAsyncPort;
113	/** Our cache to reduce allocation overhead. */
114	PRTOBJCACHE pCache;
115	} VBOXDISK, *PVBOXDISK;
116
117	/*******************************************************************************
118	* Error reporting callback *
119	*******************************************************************************/
120
121	static void drvvdErrorCallback(void *pvUser, int rc, RT_SRC_POS_DECL,
122	const char *pszFormat, va_list va)
123	{
124	PPDMDRVINS pDrvIns = (PPDMDRVINS)pvUser;
125	pDrvIns->pDrvHlp->pfnVMSetErrorV(pDrvIns, rc, RT_SRC_POS_ARGS, pszFormat, va);
126	}
127
128	/*******************************************************************************
129	* VD Async I/O interface implementation *
130	*******************************************************************************/
131
132	static DECLCALLBACK(int) drvvdAsyncIOOpen(void pvUser, const char pszLocation, bool fReadonly, void **ppStorage)
133	{
134	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
135
136	return pDrvVD->pDrvTransportAsync->pfnOpen(pDrvVD->pDrvTransportAsync, pszLocation, fReadonly, ppStorage);
137	}
138
139	static DECLCALLBACK(int) drvvdAsyncIOClose(void pvUser, void pStorage)
140	{
141	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
142
143	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
144
145	return pDrvVD->pDrvTransportAsync->pfnClose(pDrvVD->pDrvTransportAsync, pStorage);
146	}
147
148	static DECLCALLBACK(int) drvvdAsyncIORead(void pvUser, void pStorage, uint64_t uOffset,
149	size_t cbRead, void pvBuf, size_t pcbRead)
150	{
151	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
152
153	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
154
155	return pDrvVD->pDrvTransportAsync->pfnReadSynchronous(pDrvVD->pDrvTransportAsync,
156	pStorage,
157	uOffset, pvBuf, cbRead, pcbRead);
158	}
159
160	static DECLCALLBACK(int) drvvdAsyncIOWrite(void pvUser, void pStorage, uint64_t uOffset,
161	size_t cbWrite, const void pvBuf, size_t pcbWritten)
162	{
163	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
164
165	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
166
167	return pDrvVD->pDrvTransportAsync->pfnWriteSynchronous(pDrvVD->pDrvTransportAsync,
168	pStorage,
169	uOffset, pvBuf, cbWrite, pcbWritten);
170	}
171
172	static DECLCALLBACK(int) drvvdAsyncIOFlush(void pvUser, void pStorage)
173	{
174	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
175
176	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
177
178	return pDrvVD->pDrvTransportAsync->pfnFlushSynchronous(pDrvVD->pDrvTransportAsync, pStorage);
179	}
180
181	static DECLCALLBACK(int) drvvdAsyncIOPrepareRead(void pvUser, void pStorage, uint64_t uOffset, void pvBuf, size_t cbRead, void *ppTask)
182	{
183	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
184
185	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
186
187	return pDrvVD->pDrvTransportAsync->pfnPrepareRead(pDrvVD->pDrvTransportAsync, pStorage, uOffset, pvBuf, cbRead, ppTask);
188	}
189
190	static DECLCALLBACK(int) drvvdAsyncIOPrepareWrite(void pvUser, void pStorage, uint64_t uOffset, void pvBuf, size_t cbWrite, void *ppTask)
191	{
192	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
193
194	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
195
196	return pDrvVD->pDrvTransportAsync->pfnPrepareWrite(pDrvVD->pDrvTransportAsync, pStorage, uOffset, pvBuf, cbWrite, ppTask);
197	}
198
199	static DECLCALLBACK(int) drvvdAsyncIOTasksSubmit(void pvUser, void apTasks[], unsigned cTasks, void *pvUser2,
200	void *pvUserCaller, PFNVDCOMPLETED pfnTasksCompleted)
201	{
202	PVBOXDISK pDrvVD = (PVBOXDISK)pvUser;
203	PDRVVDASYNCTASK pDrvVDAsyncTask;
204	int rc;
205
206	AssertMsg(pDrvVD->pDrvTransportAsync, ("Asynchronous function called but no async transport interface below\n"));
207
208	rc = RTCacheRequest(pDrvVD->pCache, (void **)&pDrvVDAsyncTask);
209
210	if (RT_FAILURE(rc))
211	return rc;
212
213	pDrvVDAsyncTask->pfnCompleted = pfnTasksCompleted;
214	pDrvVDAsyncTask->pvUser = pvUser2;
215	pDrvVDAsyncTask->pvUserCaller = pvUserCaller;
216
217	return pDrvVD->pDrvTransportAsync->pfnTasksSubmit(pDrvVD->pDrvTransportAsync, apTasks, cTasks, pDrvVDAsyncTask);
218	}
219
220	/*******************************************************************************
221	* VD Configuration interface implementation *
222	*******************************************************************************/
223
224	static bool drvvdCfgAreValuesValid(PVDCFGNODE pNode, const char *pszzValid)
225	{
226	return CFGMR3AreValuesValid((PCFGMNODE)pNode, pszzValid);
227	}
228
229	static int drvvdCfgQueryType(PVDCFGNODE pNode, const char *pszName, PVDCFGVALUETYPE penmType)
230	{
231	Assert(VDCFGVALUETYPE_INTEGER == CFGMVALUETYPE_INTEGER);
232	Assert(VDCFGVALUETYPE_STRING == CFGMVALUETYPE_STRING);
233	Assert(VDCFGVALUETYPE_BYTES == CFGMVALUETYPE_BYTES);
234	return CFGMR3QueryType((PCFGMNODE)pNode, pszName, (PCFGMVALUETYPE)penmType);
235	}
236
237	static int drvvdCfgQuerySize(PVDCFGNODE pNode, const char pszName, size_t pcb)
238	{
239	return CFGMR3QuerySize((PCFGMNODE)pNode, pszName, pcb);
240	}
241
242	static int drvvdCfgQueryInteger(PVDCFGNODE pNode, const char pszName, uint64_t pu64)
243	{
244	return CFGMR3QueryInteger((PCFGMNODE)pNode, pszName, pu64);
245	}
246
247	static int drvvdCfgQueryIntegerDef(PVDCFGNODE pNode, const char pszName, uint64_t pu64, uint64_t u64Def)
248	{
249	return CFGMR3QueryInteger((PCFGMNODE)pNode, pszName, pu64);
250	}
251
252	static int drvvdCfgQueryString(PVDCFGNODE pNode, const char pszName, char pszString, size_t cchString)
253	{
254	return CFGMR3QueryString((PCFGMNODE)pNode, pszName, pszString, cchString);
255	}
256
257	static int drvvdCfgQueryStringDef(PVDCFGNODE pNode, const char pszName, char pszString, size_t cchString, const char *pszDef)
258	{
259	return CFGMR3QueryStringDef((PCFGMNODE)pNode, pszName, pszString, cchString, pszDef);
260	}
261
262	static int drvvdCfgQueryBytes(PVDCFGNODE pNode, const char pszName, void pvData, size_t cbData)
263	{
264	return CFGMR3QueryBytes((PCFGMNODE)pNode, pszName, pvData, cbData);
265	}
266
267
268	/*******************************************************************************
269	* Media interface methods *
270	*******************************************************************************/
271
272	/** @copydoc PDMIMEDIA::pfnRead */
273	static DECLCALLBACK(int) drvvdRead(PPDMIMEDIA pInterface,
274	uint64_t off, void *pvBuf, size_t cbRead)
275	{
276	LogFlow(("%s: off=%#llx pvBuf=%p cbRead=%d\n", __FUNCTION__,
277	off, pvBuf, cbRead));
278	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
279	int rc = VDRead(pThis->pDisk, off, pvBuf, cbRead);
280	if (RT_SUCCESS(rc))
281	Log2(("%s: off=%#llx pvBuf=%p cbRead=%d %.*Vhxd\n", __FUNCTION__,
282	off, pvBuf, cbRead, cbRead, pvBuf));
283	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
284	return rc;
285	}
286
287	/** @copydoc PDMIMEDIA::pfnWrite */
288	static DECLCALLBACK(int) drvvdWrite(PPDMIMEDIA pInterface,
289	uint64_t off, const void *pvBuf,
290	size_t cbWrite)
291	{
292	LogFlow(("%s: off=%#llx pvBuf=%p cbWrite=%d\n", __FUNCTION__,
293	off, pvBuf, cbWrite));
294	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
295	Log2(("%s: off=%#llx pvBuf=%p cbWrite=%d %.*Vhxd\n", __FUNCTION__,
296	off, pvBuf, cbWrite, cbWrite, pvBuf));
297	int rc = VDWrite(pThis->pDisk, off, pvBuf, cbWrite);
298	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
299	return rc;
300	}
301
302	/** @copydoc PDMIMEDIA::pfnFlush */
303	static DECLCALLBACK(int) drvvdFlush(PPDMIMEDIA pInterface)
304	{
305	LogFlow(("%s:\n", __FUNCTION__));
306	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
307	int rc = VDFlush(pThis->pDisk);
308	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
309	return rc;
310	}
311
312	/** @copydoc PDMIMEDIA::pfnGetSize */
313	static DECLCALLBACK(uint64_t) drvvdGetSize(PPDMIMEDIA pInterface)
314	{
315	LogFlow(("%s:\n", __FUNCTION__));
316	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
317	uint64_t cb = VDGetSize(pThis->pDisk, VD_LAST_IMAGE);
318	LogFlow(("%s: returns %#llx (%llu)\n", __FUNCTION__, cb, cb));
319	return cb;
320	}
321
322	/** @copydoc PDMIMEDIA::pfnIsReadOnly */
323	static DECLCALLBACK(bool) drvvdIsReadOnly(PPDMIMEDIA pInterface)
324	{
325	LogFlow(("%s:\n", __FUNCTION__));
326	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
327	bool f = VDIsReadOnly(pThis->pDisk);
328	LogFlow(("%s: returns %d\n", __FUNCTION__, f));
329	return f;
330	}
331
332	/** @copydoc PDMIMEDIA::pfnBiosGetPCHSGeometry */
333	static DECLCALLBACK(int) drvvdBiosGetPCHSGeometry(PPDMIMEDIA pInterface,
334	PPDMMEDIAGEOMETRY pPCHSGeometry)
335	{
336	LogFlow(("%s:\n", __FUNCTION__));
337	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
338	int rc = VDGetPCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pPCHSGeometry);
339	if (RT_FAILURE(rc))
340	{
341	Log(("%s: geometry not available.\n", __FUNCTION__));
342	rc = VERR_PDM_GEOMETRY_NOT_SET;
343	}
344	LogFlow(("%s: returns %Rrc (CHS=%d/%d/%d)\n", __FUNCTION__,
345	rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
346	return rc;
347	}
348
349	/** @copydoc PDMIMEDIA::pfnBiosSetPCHSGeometry */
350	static DECLCALLBACK(int) drvvdBiosSetPCHSGeometry(PPDMIMEDIA pInterface,
351	PCPDMMEDIAGEOMETRY pPCHSGeometry)
352	{
353	LogFlow(("%s: CHS=%d/%d/%d\n", __FUNCTION__,
354	pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
355	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
356	int rc = VDSetPCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pPCHSGeometry);
357	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
358	return rc;
359	}
360
361	/** @copydoc PDMIMEDIA::pfnBiosGetLCHSGeometry */
362	static DECLCALLBACK(int) drvvdBiosGetLCHSGeometry(PPDMIMEDIA pInterface,
363	PPDMMEDIAGEOMETRY pLCHSGeometry)
364	{
365	LogFlow(("%s:\n", __FUNCTION__));
366	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
367	int rc = VDGetLCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pLCHSGeometry);
368	if (RT_FAILURE(rc))
369	{
370	Log(("%s: geometry not available.\n", __FUNCTION__));
371	rc = VERR_PDM_GEOMETRY_NOT_SET;
372	}
373	LogFlow(("%s: returns %Rrc (CHS=%d/%d/%d)\n", __FUNCTION__,
374	rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
375	return rc;
376	}
377
378	/** @copydoc PDMIMEDIA::pfnBiosSetLCHSGeometry */
379	static DECLCALLBACK(int) drvvdBiosSetLCHSGeometry(PPDMIMEDIA pInterface,
380	PCPDMMEDIAGEOMETRY pLCHSGeometry)
381	{
382	LogFlow(("%s: CHS=%d/%d/%d\n", __FUNCTION__,
383	pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
384	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
385	int rc = VDSetLCHSGeometry(pThis->pDisk, VD_LAST_IMAGE, pLCHSGeometry);
386	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
387	return rc;
388	}
389
390	/** @copydoc PDMIMEDIA::pfnGetUuid */
391	static DECLCALLBACK(int) drvvdGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid)
392	{
393	LogFlow(("%s:\n", __FUNCTION__));
394	PVBOXDISK pThis = PDMIMEDIA_2_VBOXDISK(pInterface);
395	int rc = VDGetUuid(pThis->pDisk, 0, pUuid);
396	LogFlow(("%s: returns %Rrc ({%RTuuid})\n", __FUNCTION__, rc, pUuid));
397	return rc;
398	}
399
400	/*******************************************************************************
401	* Async Media interface methods *
402	*******************************************************************************/
403
404	static DECLCALLBACK(int) drvvdStartRead(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
405	PPDMDATASEG paSeg, unsigned cSeg,
406	size_t cbRead, void *pvUser)
407	{
408	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbRead=%d\n pvUser=%#p", __FUNCTION__,
409	uOffset, paSeg, cSeg, cbRead, pvUser));
410	PVBOXDISK pThis = PDMIMEDIAASYNC_2_VBOXDISK(pInterface);
411	int rc = VDAsyncRead(pThis->pDisk, uOffset, cbRead, paSeg, cSeg, pvUser);
412	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
413	return rc;
414	}
415
416	static DECLCALLBACK(int) drvvdStartWrite(PPDMIMEDIAASYNC pInterface, uint64_t uOffset,
417	PPDMDATASEG paSeg, unsigned cSeg,
418	size_t cbWrite, void *pvUser)
419	{
420	LogFlow(("%s: uOffset=%#llx paSeg=%#p cSeg=%u cbWrite=%d\n pvUser=%#p", __FUNCTION__,
421	uOffset, paSeg, cSeg, cbWrite, pvUser));
422	PVBOXDISK pThis = PDMIMEDIAASYNC_2_VBOXDISK(pInterface);
423	int rc = VDAsyncWrite(pThis->pDisk, uOffset, cbWrite, paSeg, cSeg, pvUser);
424	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
425	return rc;
426	}
427
428	/*******************************************************************************
429	* Async transport port interface methods *
430	*******************************************************************************/
431
432	static DECLCALLBACK(int) drvvdTasksCompleteNotify(PPDMITRANSPORTASYNCPORT pInterface, void *pvUser)
433	{
434	PVBOXDISK pThis = PDMITRANSPORTASYNCPORT_2_VBOXDISK(pInterface);
435	PDRVVDASYNCTASK pDrvVDAsyncTask = (PDRVVDASYNCTASK)pvUser;
436	int rc = VINF_VDI_ASYNC_IO_FINISHED;
437
438	/* Having a completion callback for a task is not mandatory. */
439	if (pDrvVDAsyncTask->pfnCompleted)
440	rc = pDrvVDAsyncTask->pfnCompleted(pDrvVDAsyncTask->pvUser);
441
442	/* Check if the request is finished. */
443	if (rc == VINF_VDI_ASYNC_IO_FINISHED)
444	{
445	rc = pThis->pDrvMediaAsyncPort->pfnTransferCompleteNotify(pThis->pDrvMediaAsyncPort, pDrvVDAsyncTask->pvUserCaller);
446	}
447	else if (rc == VERR_VDI_ASYNC_IO_IN_PROGRESS)
448	rc = VINF_SUCCESS;
449
450	rc = RTCacheInsert(pThis->pCache, pDrvVDAsyncTask);
451	AssertRC(rc);
452
453	return rc;
454	}
455
456
457	/*******************************************************************************
458	* Base interface methods *
459	*******************************************************************************/
460
461	/** @copydoc PDMIBASE::pfnQueryInterface */
462	static DECLCALLBACK(void *) drvvdQueryInterface(PPDMIBASE pInterface,
463	PDMINTERFACE enmInterface)
464	{
465	PPDMDRVINS pDrvIns = PDMIBASE_2_DRVINS(pInterface);
466	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
467	switch (enmInterface)
468	{
469	case PDMINTERFACE_BASE:
470	return &pDrvIns->IBase;
471	case PDMINTERFACE_MEDIA:
472	return &pThis->IMedia;
473	case PDMINTERFACE_MEDIA_ASYNC:
474	return pThis->fAsyncIOSupported ? &pThis->IMediaAsync : NULL;
475	case PDMINTERFACE_TRANSPORT_ASYNC_PORT:
476	return &pThis->ITransportAsyncPort;
477	default:
478	return NULL;
479	}
480	}
481
482
483	/*******************************************************************************
484	* Driver methods *
485	*******************************************************************************/
486
487
488	/**
489	* Construct a VBox disk media driver instance.
490	*
491	* @returns VBox status.
492	* @param pDrvIns The driver instance data.
493	* If the registration structure is needed, pDrvIns->pDrvReg points to it.
494	* @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration
495	* of the driver instance. It's also found in pDrvIns->pCfgHandle as it's expected
496	* to be used frequently in this function.
497	*/
498	static DECLCALLBACK(int) drvvdConstruct(PPDMDRVINS pDrvIns,
499	PCFGMNODE pCfgHandle)
500	{
501	LogFlow(("%s:\n", __FUNCTION__));
502	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
503	int rc = VINF_SUCCESS;
504	char pszName = NULL; /< The path of the disk image file. /
505	char pszFormat = NULL; /< The format backed to use for this image. /
506	bool fReadOnly; /*< True if the media is readonly. /
507	bool fHonorZeroWrites; /*< True if zero blocks should be written. /
508
509	/*
510	* Init the static parts.
511	*/
512	pDrvIns->IBase.pfnQueryInterface = drvvdQueryInterface;
513	pThis->pDrvIns = pDrvIns;
514	pThis->fTempReadOnly = false;
515	pThis->pDisk = NULL;
516
517	/* IMedia */
518	pThis->IMedia.pfnRead = drvvdRead;
519	pThis->IMedia.pfnWrite = drvvdWrite;
520	pThis->IMedia.pfnFlush = drvvdFlush;
521	pThis->IMedia.pfnGetSize = drvvdGetSize;
522	pThis->IMedia.pfnIsReadOnly = drvvdIsReadOnly;
523	pThis->IMedia.pfnBiosGetPCHSGeometry = drvvdBiosGetPCHSGeometry;
524	pThis->IMedia.pfnBiosSetPCHSGeometry = drvvdBiosSetPCHSGeometry;
525	pThis->IMedia.pfnBiosGetLCHSGeometry = drvvdBiosGetLCHSGeometry;
526	pThis->IMedia.pfnBiosSetLCHSGeometry = drvvdBiosSetLCHSGeometry;
527	pThis->IMedia.pfnGetUuid = drvvdGetUuid;
528
529	/* IMediaAsync */
530	pThis->IMediaAsync.pfnStartRead = drvvdStartRead;
531	pThis->IMediaAsync.pfnStartWrite = drvvdStartWrite;
532
533	/* ITransportAsyncPort */
534	pThis->ITransportAsyncPort.pfnTaskCompleteNotify = drvvdTasksCompleteNotify;
535
536	/* Initialize supported VD interfaces. */
537	pThis->VDIErrorCallbacks.cbSize = sizeof(VDINTERFACEERROR);
538	pThis->VDIErrorCallbacks.enmInterface = VDINTERFACETYPE_ERROR;
539	pThis->VDIErrorCallbacks.pfnError = drvvdErrorCallback;
540
541	rc = VDInterfaceCreate(&pThis->VDIError, "DrvVD_VDIError", VDINTERFACETYPE_ERROR,
542	&pThis->VDIErrorCallbacks, pDrvIns, NULL);
543	AssertRC(rc);
544
545	pThis->VDIAsyncIOCallbacks.cbSize = sizeof(VDINTERFACEASYNCIO);
546	pThis->VDIAsyncIOCallbacks.enmInterface = VDINTERFACETYPE_ASYNCIO;
547	pThis->VDIAsyncIOCallbacks.pfnOpen = drvvdAsyncIOOpen;
548	pThis->VDIAsyncIOCallbacks.pfnClose = drvvdAsyncIOClose;
549	pThis->VDIAsyncIOCallbacks.pfnRead = drvvdAsyncIORead;
550	pThis->VDIAsyncIOCallbacks.pfnWrite = drvvdAsyncIOWrite;
551	pThis->VDIAsyncIOCallbacks.pfnFlush = drvvdAsyncIOFlush;
552	pThis->VDIAsyncIOCallbacks.pfnPrepareRead = drvvdAsyncIOPrepareRead;
553	pThis->VDIAsyncIOCallbacks.pfnPrepareWrite = drvvdAsyncIOPrepareWrite;
554	pThis->VDIAsyncIOCallbacks.pfnTasksSubmit = drvvdAsyncIOTasksSubmit;
555
556	rc = VDInterfaceCreate(&pThis->VDIAsyncIO, "DrvVD_AsyncIO", VDINTERFACETYPE_ASYNCIO,
557	&pThis->VDIAsyncIOCallbacks, pThis, &pThis->VDIError);
558	AssertRC(rc);
559
560	pThis->VDIConfigCallbacks.cbSize = sizeof(VDINTERFACECONFIG);
561	pThis->VDIConfigCallbacks.enmInterface = VDINTERFACETYPE_CONFIG;
562	pThis->VDIConfigCallbacks.pfnAreValuesValid = drvvdCfgAreValuesValid;
563	pThis->VDIConfigCallbacks.pfnQueryType = drvvdCfgQueryType;
564	pThis->VDIConfigCallbacks.pfnQuerySize = drvvdCfgQuerySize;
565	pThis->VDIConfigCallbacks.pfnQueryInteger = drvvdCfgQueryInteger;
566	pThis->VDIConfigCallbacks.pfnQueryIntegerDef = drvvdCfgQueryIntegerDef;
567	pThis->VDIConfigCallbacks.pfnQueryString = drvvdCfgQueryString;
568	pThis->VDIConfigCallbacks.pfnQueryStringDef = drvvdCfgQueryStringDef;
569	pThis->VDIConfigCallbacks.pfnQueryBytes = drvvdCfgQueryBytes;
570
571	/** @todo TEMP! this isn't really correct - this needs to be made per image,
572	* as CFGM needs access to the right configuration node for each image.
573	* At the moment this is harmless, as iSCSI can only be used as a base
574	* image, and no other backend uses the private data for these callbacks. */
575	rc = VDInterfaceCreate(&pThis->VDIConfig, "DrvVD_Config", VDINTERFACETYPE_CONFIG,
576	&pThis->VDIConfigCallbacks, NULL /*< @todo TEMP /, &pThis->VDIAsyncIO);
577	AssertRC(rc);
578
579	/* Try to attach async media port interface above.*/
580	pThis->pDrvMediaAsyncPort = (PPDMIMEDIAASYNCPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_MEDIA_ASYNC_PORT);
581
582	/*
583	* Attach the async transport driver below of the device above us implements the
584	* async interface.
585	*/
586	if (pThis->pDrvMediaAsyncPort)
587	{
588	/* Try to attach the driver. */
589	PPDMIBASE pBase;
590
591	rc = pDrvIns->pDrvHlp->pfnAttach(pDrvIns, &pBase);
592	if (rc == VERR_PDM_NO_ATTACHED_DRIVER)
593	{
594	/*
595	* Though the device supports async I/O the backend seems to not support it.
596	* Revert to non async I/O.
597	*/
598	pThis->pDrvMediaAsyncPort = NULL;
599	}
600	else if (RT_FAILURE(rc))
601	{
602	AssertMsgFailed(("Failed to attach async transport driver below rc=%Rrc\n", rc));
603	}
604	else
605	{
606	/* Success query the async transport interface. */
607	pThis->pDrvTransportAsync = (PPDMITRANSPORTASYNC)pBase->pfnQueryInterface(pBase, PDMINTERFACE_TRANSPORT_ASYNC);
608	if (!pThis->pDrvTransportAsync)
609	{
610	/* Whoops. */
611	AssertMsgFailed(("Configuration error: No async transport interface below!\n"));
612	return VERR_PDM_MISSING_INTERFACE_ABOVE;
613	}
614	}
615	}
616
617	/*
618	* Validate configuration and find all parent images.
619	* It's sort of up side down from the image dependency tree.
620	*/
621	unsigned iLevel = 0;
622	PCFGMNODE pCurNode = pCfgHandle;
623	for (;;)
624	{
625	bool fValid;
626
627	if (pCurNode == pCfgHandle)
628	{
629	/* Toplevel configuration additionally contains the global image
630	* open flags. Some might be converted to per-image flags later. */
631	fValid = CFGMR3AreValuesValid(pCurNode,
632	"Format\0Path\0"
633	"ReadOnly\0HonorZeroWrites\0");
634	}
635	else
636	{
637	/* All other image configurations only contain image name and
638	* the format information. */
639	fValid = CFGMR3AreValuesValid(pCurNode, "Format\0Path\0");
640	}
641	if (!fValid)
642	{
643	rc = PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES,
644	RT_SRC_POS, N_("DrvVD: Configuration error: keys incorrect at level %d"), iLevel);
645	break;
646	}
647
648	PCFGMNODE pParent = CFGMR3GetChild(pCurNode, "Parent");
649	if (!pParent)
650	break;
651	pCurNode = pParent;
652	iLevel++;
653	}
654
655	/*
656	* Open the images.
657	*/
658	if (RT_SUCCESS(rc))
659	{
660	/** @todo TEMP! later the iSCSI config callbacks won't be included here */
661	rc = VDCreate(&pThis->VDIConfig, &pThis->pDisk);
662	/* Error message is already set correctly. */
663	}
664
665	unsigned cImages = iLevel;
666	while (pCurNode && RT_SUCCESS(rc))
667	{
668	/*
669	* Read the image configuration.
670	*/
671	rc = CFGMR3QueryStringAlloc(pCurNode, "Path", &pszName);
672	if (RT_FAILURE(rc))
673	{
674	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
675	N_("DrvVD: Configuration error: Querying \"Path\" as string failed"));
676	break;
677	}
678
679	rc = CFGMR3QueryStringAlloc(pCfgHandle, "Format", &pszFormat);
680	if (RT_FAILURE(rc))
681	{
682	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
683	N_("DrvVD: Configuration error: Querying \"Format\" as string failed"));
684	break;
685	}
686
687	if (iLevel == 0)
688	{
689	rc = CFGMR3QueryBool(pCurNode, "ReadOnly", &fReadOnly);
690	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
691	fReadOnly = false;
692	else if (RT_FAILURE(rc))
693	{
694	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
695	N_("DrvVD: Configuration error: Querying \"ReadOnly\" as boolean failed"));
696	break;
697	}
698
699	rc = CFGMR3QueryBool(pCfgHandle, "HonorZeroWrites", &fHonorZeroWrites);
700	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
701	fHonorZeroWrites = false;
702	else if (RT_FAILURE(rc))
703	{
704	rc = PDMDRV_SET_ERROR(pDrvIns, rc,
705	N_("DrvVD: Configuration error: Querying \"HonorZeroWrites\" as boolean failed"));
706	break;
707	}
708	}
709	else
710	{
711	fReadOnly = true;
712	fHonorZeroWrites = false;
713	}
714
715	/** @todo TEMP! Later this needs to be done for each image. */
716	if (iLevel == cImages)
717	{
718	PCFGMNODE pCfg = CFGMR3GetChild(pCurNode, "VDConfig");
719	pThis->VDIConfig.pvUser = pCfg; /*< @todo TEMP! /
720	}
721
722	/*
723	* Open the image.
724	*/
725	unsigned uOpenFlags;
726	if (fReadOnly)
727	uOpenFlags = VD_OPEN_FLAGS_READONLY;
728	else
729	uOpenFlags = VD_OPEN_FLAGS_NORMAL;
730	if (fHonorZeroWrites)
731	uOpenFlags \|= VD_OPEN_FLAGS_HONOR_ZEROES;
732	if (pThis->pDrvMediaAsyncPort)
733	uOpenFlags \|= VD_OPEN_FLAGS_ASYNC_IO;
734
735	/** Try to open backend in asyc I/O mode first. */
736	rc = VDOpen(pThis->pDisk, pszFormat, pszName, uOpenFlags);
737	if (rc == VERR_NOT_SUPPORTED)
738	{
739	/* Seems async I/O is not supported by the backend, open in normal mode. */
740	uOpenFlags &= ~VD_OPEN_FLAGS_ASYNC_IO;
741	rc = VDOpen(pThis->pDisk, pszFormat, pszName, uOpenFlags);
742	}
743
744	if (RT_SUCCESS(rc))
745	Log(("%s: %d - Opened '%s' in %s mode\n", __FUNCTION__,
746	iLevel, pszName,
747	VDIsReadOnly(pThis->pDisk) ? "read-only" : "read-write"));
748	else
749	{
750	AssertMsgFailed(("Failed to open image '%s' rc=%Rrc\n", pszName, rc));
751	break;
752	}
753
754
755	MMR3HeapFree(pszName);
756	pszName = NULL;
757	MMR3HeapFree(pszFormat);
758	pszFormat = NULL;
759
760	/* next */
761	iLevel--;
762	pCurNode = CFGMR3GetParent(pCurNode);
763	}
764
765	if (RT_FAILURE(rc))
766	{
767	if (VALID_PTR(pThis->pDisk))
768	{
769	VDDestroy(pThis->pDisk);
770	pThis->pDisk = NULL;
771	}
772	if (VALID_PTR(pszName))
773	MMR3HeapFree(pszName);
774	if (VALID_PTR(pszFormat))
775	MMR3HeapFree(pszFormat);
776	}
777
778	/*
779	* Check for async I/O support. Every opened image has to support
780	* it.
781	*/
782	pThis->fAsyncIOSupported = true;
783	for (unsigned i = 0; i < VDGetCount(pThis->pDisk); i++)
784	{
785	VDBACKENDINFO vdBackendInfo;
786
787	rc = VDBackendInfoSingle(pThis->pDisk, i, &vdBackendInfo);
788	AssertRC(rc);
789
790	if (vdBackendInfo.uBackendCaps & VD_CAP_ASYNC)
791	{
792	/*
793	* Backend indicates support for at least some files.
794	* Check if current file is supported with async I/O)
795	*/
796	rc = VDImageIsAsyncIOSupported(pThis->pDisk, i, &pThis->fAsyncIOSupported);
797	AssertRC(rc);
798
799	/*
800	* Check if current image is supported.
801	* If not we can stop checking because
802	* at least one does not support it.
803	*/
804	if (!pThis->fAsyncIOSupported)
805	break;
806	}
807	else
808	{
809	pThis->fAsyncIOSupported = false;
810	break;
811	}
812	}
813
814	/* Create cache if async I/O is supported. */
815	if (pThis->fAsyncIOSupported)
816	{
817	rc = RTCacheCreate(&pThis->pCache, 0, sizeof(DRVVDASYNCTASK), RTOBJCACHE_PROTECT_INSERT);
818	AssertMsg(RT_SUCCESS(rc), ("Failed to create cache rc=%Rrc\n", rc));
819	}
820
821	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
822	return rc;
823	}
824
825	/**
826	* Destruct a driver instance.
827	*
828	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
829	* resources can be freed correctly.
830	*
831	* @param pDrvIns The driver instance data.
832	*/
833	static DECLCALLBACK(void) drvvdDestruct(PPDMDRVINS pDrvIns)
834	{
835	int rc;
836	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
837	LogFlow(("%s:\n", __FUNCTION__));
838
839	if (pThis->pCache)
840	{
841	rc = RTCacheDestroy(pThis->pCache);
842	AssertRC(rc);
843	}
844	}
845
846
847	/**
848	* When the VM has been suspended we'll change the image mode to read-only
849	* so that main and others can read the VDIs. This is important when
850	* saving state and so forth.
851	*
852	* @param pDrvIns The driver instance data.
853	*/
854	static DECLCALLBACK(void) drvvdSuspend(PPDMDRVINS pDrvIns)
855	{
856	LogFlow(("%s:\n", __FUNCTION__));
857	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
858	if (!VDIsReadOnly(pThis->pDisk))
859	{
860	unsigned uOpenFlags;
861	int rc = VDGetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, &uOpenFlags);
862	AssertRC(rc);
863	uOpenFlags \|= VD_OPEN_FLAGS_READONLY;
864	rc = VDSetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, uOpenFlags);
865	AssertRC(rc);
866	pThis->fTempReadOnly = true;
867	}
868	}
869
870	/**
871	* Before the VM resumes we'll have to undo the read-only mode change
872	* done in drvvdSuspend.
873	*
874	* @param pDrvIns The driver instance data.
875	*/
876	static DECLCALLBACK(void) drvvdResume(PPDMDRVINS pDrvIns)
877	{
878	LogFlow(("%s:\n", __FUNCTION__));
879	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
880	if (pThis->fTempReadOnly)
881	{
882	unsigned uOpenFlags;
883	int rc = VDGetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, &uOpenFlags);
884	AssertRC(rc);
885	uOpenFlags &= ~VD_OPEN_FLAGS_READONLY;
886	rc = VDSetOpenFlags(pThis->pDisk, VD_LAST_IMAGE, uOpenFlags);
887	AssertRC(rc);
888	pThis->fTempReadOnly = false;
889	}
890	}
891
892	static DECLCALLBACK(void) drvvdPowerOff(PPDMDRVINS pDrvIns)
893	{
894	LogFlow(("%s:\n", __FUNCTION__));
895	PVBOXDISK pThis = PDMINS_2_DATA(pDrvIns, PVBOXDISK);
896
897	/*
898	* We must close the disk here to ensure that
899	* the backend closes all files before the
900	* async transport driver is destructed.
901	*/
902	int rc = VDCloseAll(pThis->pDisk);
903	AssertRC(rc);
904	}
905
906	/**
907	* VBox disk container media driver registration record.
908	*/
909	const PDMDRVREG g_DrvVD =
910	{
911	/* u32Version */
912	PDM_DRVREG_VERSION,
913	/* szDriverName */
914	"VD",
915	/* pszDescription */
916	"Generic VBox disk media driver.",
917	/* fFlags */
918	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
919	/* fClass. */
920	PDM_DRVREG_CLASS_MEDIA,
921	/* cMaxInstances */
922	~0,
923	/* cbInstance */
924	sizeof(VBOXDISK),
925	/* pfnConstruct */
926	drvvdConstruct,
927	/* pfnDestruct */
928	drvvdDestruct,
929	/* pfnIOCtl */
930	NULL,
931	/* pfnPowerOn */
932	NULL,
933	/* pfnReset */
934	NULL,
935	/* pfnSuspend */
936	drvvdSuspend,
937	/* pfnResume */
938	drvvdResume,
939	/* pfnDetach */
940	NULL,
941	/* pfnPowerOff */
942	drvvdPowerOff
943	};

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source: vbox/trunk/src/VBox/Devices/Storage/DrvVD.cpp@ 11287

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