StorageControllerImpl.cpp@ 56574

Last change on this file since 56574 was 56477, checked in by vboxsync, 9 years ago
Main/StorageController: Eliminate leftovers from the SATA IDE emulation which are not required anymore for a long time now. To avoid bumping the settings version for older configs when read with VBox 5.0 the default config is hardcoded in the settings code
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File size: 22.3 KB

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1	/* $Id: StorageControllerImpl.cpp 56477 2015-06-17 14:15:53Z vboxsync $ */
2
3	/** @file
4	*
5	* Implementation of IStorageController.
6	*/
7
8	/*
9	* Copyright (C) 2008-2015 Oracle Corporation
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
20	#include "StorageControllerImpl.h"
21	#include "MachineImpl.h"
22	#include "VirtualBoxImpl.h"
23	#include "SystemPropertiesImpl.h"
24
25	#include <iprt/string.h>
26	#include <iprt/cpp/utils.h>
27
28	#include <VBox/err.h>
29	#include <VBox/settings.h>
30
31	#include <algorithm>
32
33	#include "AutoStateDep.h"
34	#include "AutoCaller.h"
35	#include "Logging.h"
36
37	// defines
38	/////////////////////////////////////////////////////////////////////////////
39	//
40	//
41	DEFINE_EMPTY_CTOR_DTOR(StorageController)
42
43	struct BackupableStorageControllerData
44	{
45	/* Constructor. */
46	BackupableStorageControllerData()
47	: mStorageBus(StorageBus_IDE),
48	mStorageControllerType(StorageControllerType_PIIX4),
49	mInstance(0),
50	mPortCount(2),
51	fUseHostIOCache(true),
52	fBootable(false)
53	{ }
54
55	/** Unique name of the storage controller. */
56	Utf8Str strName;
57	/** The connection type of the storage controller. */
58	StorageBus_T mStorageBus;
59	/** Type of the Storage controller. */
60	StorageControllerType_T mStorageControllerType;
61	/** Instance number of the storage controller. */
62	ULONG mInstance;
63	/** Number of usable ports. */
64	ULONG mPortCount;
65	/** Whether to use the host IO caches. */
66	BOOL fUseHostIOCache;
67	/** Whether it is possible to boot from disks attached to this controller. */
68	BOOL fBootable;
69	};
70
71	struct StorageController::Data
72	{
73	Data(Machine * const aMachine)
74	: pVirtualBox(NULL),
75	pSystemProperties(NULL),
76	pParent(aMachine)
77	{
78	unconst(pVirtualBox) = aMachine->i_getVirtualBox();
79	unconst(pSystemProperties) = pVirtualBox->i_getSystemProperties();
80	}
81
82	VirtualBox * const pVirtualBox;
83	SystemProperties * const pSystemProperties;
84	Machine * const pParent;
85	const ComObjPtr<StorageController> pPeer;
86
87	Backupable<BackupableStorageControllerData> bd;
88	};
89
90
91	// constructor / destructor
92	/////////////////////////////////////////////////////////////////////////////
93
94	HRESULT StorageController::FinalConstruct()
95	{
96	return BaseFinalConstruct();
97	}
98
99	void StorageController::FinalRelease()
100	{
101	uninit();
102	BaseFinalRelease();
103	}
104
105	// public initializer/uninitializer for internal purposes only
106	/////////////////////////////////////////////////////////////////////////////
107
108	/**
109	* Initializes the storage controller object.
110	*
111	* @returns COM result indicator.
112	* @param aParent Pointer to our parent object.
113	* @param aName Name of the storage controller.
114	* @param aInstance Instance number of the storage controller.
115	*/
116	HRESULT StorageController::init(Machine *aParent,
117	const Utf8Str &aName,
118	StorageBus_T aStorageBus,
119	ULONG aInstance, bool fBootable)
120	{
121	LogFlowThisFunc(("aParent=%p aName=\"%s\" aInstance=%u\n",
122	aParent, aName.c_str(), aInstance));
123
124	ComAssertRet(aParent && !aName.isEmpty(), E_INVALIDARG);
125	if ( (aStorageBus <= StorageBus_Null)
126	\|\| (aStorageBus > StorageBus_USB))
127	return setError(E_INVALIDARG,
128	tr("Invalid storage connection type"));
129
130	ULONG maxInstances;
131	ChipsetType_T chipsetType;
132	HRESULT rc = aParent->COMGETTER(ChipsetType)(&chipsetType);
133	if (FAILED(rc))
134	return rc;
135	rc = aParent->i_getVirtualBox()->i_getSystemProperties()->
136	GetMaxInstancesOfStorageBus(chipsetType, aStorageBus, &maxInstances);
137	if (FAILED(rc))
138	return rc;
139	if (aInstance >= maxInstances)
140	return setError(E_INVALIDARG,
141	tr("Too many storage controllers of this type"));
142
143	/* Enclose the state transition NotReady->InInit->Ready */
144	AutoInitSpan autoInitSpan(this);
145	AssertReturn(autoInitSpan.isOk(), E_FAIL);
146
147	m = new Data(aParent);
148
149	/* m->pPeer is left null */
150
151	m->bd.allocate();
152
153	m->bd->strName = aName;
154	m->bd->mInstance = aInstance;
155	m->bd->fBootable = fBootable;
156	m->bd->mStorageBus = aStorageBus;
157	if ( aStorageBus != StorageBus_IDE
158	&& aStorageBus != StorageBus_Floppy)
159	m->bd->fUseHostIOCache = false;
160	else
161	m->bd->fUseHostIOCache = true;
162
163	switch (aStorageBus)
164	{
165	case StorageBus_IDE:
166	m->bd->mPortCount = 2;
167	m->bd->mStorageControllerType = StorageControllerType_PIIX4;
168	break;
169	case StorageBus_SATA:
170	m->bd->mPortCount = 30;
171	m->bd->mStorageControllerType = StorageControllerType_IntelAhci;
172	break;
173	case StorageBus_SCSI:
174	m->bd->mPortCount = 16;
175	m->bd->mStorageControllerType = StorageControllerType_LsiLogic;
176	break;
177	case StorageBus_Floppy:
178	m->bd->mPortCount = 1;
179	m->bd->mStorageControllerType = StorageControllerType_I82078;
180	break;
181	case StorageBus_SAS:
182	m->bd->mPortCount = 8;
183	m->bd->mStorageControllerType = StorageControllerType_LsiLogicSas;
184	case StorageBus_USB:
185	m->bd->mPortCount = 8;
186	m->bd->mStorageControllerType = StorageControllerType_USB;
187	break;
188	}
189
190	/* Confirm a successful initialization */
191	autoInitSpan.setSucceeded();
192
193	return S_OK;
194	}
195
196	/**
197	* Initializes the object given another object
198	* (a kind of copy constructor). This object shares data with
199	* the object passed as an argument.
200	*
201	* @param aReshare
202	* When false, the original object will remain a data owner.
203	* Otherwise, data ownership will be transferred from the original
204	* object to this one.
205	*
206	* @note This object must be destroyed before the original object
207	* it shares data with is destroyed.
208	*
209	* @note Locks @a aThat object for writing if @a aReshare is @c true, or for
210	* reading if @a aReshare is false.
211	*/
212	HRESULT StorageController::init(Machine *aParent,
213	StorageController *aThat,
214	bool aReshare /* = false */)
215	{
216	LogFlowThisFunc(("aParent=%p, aThat=%p, aReshare=%RTbool\n",
217	aParent, aThat, aReshare));
218
219	ComAssertRet(aParent && aThat, E_INVALIDARG);
220
221	/* Enclose the state transition NotReady->InInit->Ready */
222	AutoInitSpan autoInitSpan(this);
223	AssertReturn(autoInitSpan.isOk(), E_FAIL);
224
225	m = new Data(aParent);
226
227	/* sanity */
228	AutoCaller thatCaller(aThat);
229	AssertComRCReturnRC(thatCaller.rc());
230
231	if (aReshare)
232	{
233	AutoWriteLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
234
235	unconst(aThat->m->pPeer) = this;
236	m->bd.attach (aThat->m->bd);
237	}
238	else
239	{
240	unconst(m->pPeer) = aThat;
241
242	AutoReadLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
243	m->bd.share (aThat->m->bd);
244	}
245
246	/* Confirm successful initialization */
247	autoInitSpan.setSucceeded();
248
249	return S_OK;
250	}
251
252	/**
253	* Initializes the storage controller object given another guest object
254	* (a kind of copy constructor). This object makes a private copy of data
255	* of the original object passed as an argument.
256	*/
257	HRESULT StorageController::initCopy(Machine aParent, StorageController aThat)
258	{
259	LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));
260
261	ComAssertRet(aParent && aThat, E_INVALIDARG);
262
263	/* Enclose the state transition NotReady->InInit->Ready */
264	AutoInitSpan autoInitSpan(this);
265	AssertReturn(autoInitSpan.isOk(), E_FAIL);
266
267	m = new Data(aParent);
268	/* m->pPeer is left null */
269
270	AutoCaller thatCaller(aThat);
271	AssertComRCReturnRC(thatCaller.rc());
272
273	AutoReadLock thatlock(aThat COMMA_LOCKVAL_SRC_POS);
274	m->bd.attachCopy(aThat->m->bd);
275
276	/* Confirm a successful initialization */
277	autoInitSpan.setSucceeded();
278
279	return S_OK;
280	}
281
282
283	/**
284	* Uninitializes the instance and sets the ready flag to FALSE.
285	* Called either from FinalRelease() or by the parent when it gets destroyed.
286	*/
287	void StorageController::uninit()
288	{
289	LogFlowThisFunc(("\n"));
290
291	/* Enclose the state transition Ready->InUninit->NotReady */
292	AutoUninitSpan autoUninitSpan(this);
293	if (autoUninitSpan.uninitDone())
294	return;
295
296	m->bd.free();
297
298	unconst(m->pPeer) = NULL;
299	unconst(m->pParent) = NULL;
300
301	delete m;
302	m = NULL;
303	}
304
305
306	// IStorageController properties
307	HRESULT StorageController::getName(com::Utf8Str &aName)
308	{
309	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
310
311	aName = m->bd->strName;
312
313	return S_OK;
314	}
315
316	HRESULT StorageController::setName(const com::Utf8Str &aName)
317	{
318	/* the machine needs to be mutable */
319	AutoMutableStateDependency adep(m->pParent);
320	if (FAILED(adep.rc())) return adep.rc();
321
322	AutoMultiWriteLock2 alock(m->pParent, this COMMA_LOCKVAL_SRC_POS);
323
324	if (m->bd->strName != aName)
325	{
326	ComObjPtr<StorageController> ctrl;
327	HRESULT rc = m->pParent->i_getStorageControllerByName(aName, ctrl, false /* aSetError */);
328	if (SUCCEEDED(rc))
329	return setError(VBOX_E_OBJECT_IN_USE,
330	tr("Storage controller named '%s' already exists"),
331	aName.c_str());
332
333	m->bd.backup();
334	m->bd->strName = aName;
335
336	m->pParent->i_setModified(Machine::IsModified_Storage);
337	alock.release();
338
339	m->pParent->i_onStorageControllerChange();
340	}
341
342	return S_OK;
343	}
344
345	HRESULT StorageController::getBus(StorageBus_T *aBus)
346	{
347	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
348
349	*aBus = m->bd->mStorageBus;
350
351	return S_OK;
352	}
353
354	HRESULT StorageController::getControllerType(StorageControllerType_T *aControllerType)
355	{
356	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
357
358	*aControllerType = m->bd->mStorageControllerType;
359
360	return S_OK;
361	}
362
363	HRESULT StorageController::setControllerType(StorageControllerType_T aControllerType)
364	{
365	/* the machine needs to be mutable */
366	AutoMutableStateDependency adep(m->pParent);
367	if (FAILED(adep.rc())) return adep.rc();
368
369	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
370
371	HRESULT rc = S_OK;
372
373	switch (m->bd->mStorageBus)
374	{
375	case StorageBus_IDE:
376	{
377	if ( (aControllerType != StorageControllerType_PIIX3)
378	&& (aControllerType != StorageControllerType_PIIX4)
379	&& (aControllerType != StorageControllerType_ICH6))
380	rc = E_INVALIDARG;
381	break;
382	}
383	case StorageBus_SATA:
384	{
385	if (aControllerType != StorageControllerType_IntelAhci)
386	rc = E_INVALIDARG;
387	break;
388	}
389	case StorageBus_SCSI:
390	{
391	if ( (aControllerType != StorageControllerType_LsiLogic)
392	&& (aControllerType != StorageControllerType_BusLogic))
393	rc = E_INVALIDARG;
394	break;
395	}
396	case StorageBus_Floppy:
397	{
398	if (aControllerType != StorageControllerType_I82078)
399	rc = E_INVALIDARG;
400	break;
401	}
402	case StorageBus_SAS:
403	{
404	if (aControllerType != StorageControllerType_LsiLogicSas)
405	rc = E_INVALIDARG;
406	break;
407	}
408	case StorageBus_USB:
409	{
410	if (aControllerType != StorageControllerType_USB)
411	rc = E_INVALIDARG;
412	break;
413	}
414	default:
415	AssertMsgFailed(("Invalid controller type %d\n", m->bd->mStorageBus));
416	rc = E_INVALIDARG;
417	}
418
419	if (!SUCCEEDED(rc))
420	return setError(rc,
421	tr ("Invalid controller type %d"),
422	aControllerType);
423
424	if (m->bd->mStorageControllerType != aControllerType)
425	{
426	m->bd.backup();
427	m->bd->mStorageControllerType = aControllerType;
428
429	alock.release();
430	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
431	m->pParent->i_setModified(Machine::IsModified_Storage);
432	mlock.release();
433
434	m->pParent->i_onStorageControllerChange();
435	}
436
437	return S_OK;
438	}
439
440	HRESULT StorageController::getMaxDevicesPerPortCount(ULONG *aMaxDevicesPerPortCount)
441	{
442	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
443
444	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->mStorageBus, aMaxDevicesPerPortCount);
445
446	return rc;
447	}
448
449	HRESULT StorageController::getMinPortCount(ULONG *aMinPortCount)
450	{
451	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
452
453	HRESULT rc = m->pSystemProperties->GetMinPortCountForStorageBus(m->bd->mStorageBus, aMinPortCount);
454	return rc;
455	}
456
457	HRESULT StorageController::getMaxPortCount(ULONG *aMaxPortCount)
458	{
459	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
460	HRESULT rc = m->pSystemProperties->GetMaxPortCountForStorageBus(m->bd->mStorageBus, aMaxPortCount);
461
462	return rc;
463	}
464
465	HRESULT StorageController::getPortCount(ULONG *aPortCount)
466	{
467	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
468
469	*aPortCount = m->bd->mPortCount;
470
471	return S_OK;
472	}
473
474	HRESULT StorageController::setPortCount(ULONG aPortCount)
475	{
476	/* the machine needs to be mutable */
477	AutoMutableStateDependency adep(m->pParent);
478	if (FAILED(adep.rc())) return adep.rc();
479
480	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
481
482	switch (m->bd->mStorageBus)
483	{
484	case StorageBus_SATA:
485	{
486	/* AHCI SATA supports a maximum of 30 ports. */
487	if (aPortCount < 1 \|\| aPortCount > 30)
488	return setError(E_INVALIDARG,
489	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
490	aPortCount, 1, 30);
491	break;
492	}
493	case StorageBus_SCSI:
494	{
495	/*
496	* SCSI does not support setting different ports.
497	* (doesn't make sense here either).
498	* The maximum and minimum is 16 and unless the callee
499	* tries to set a different value we return an error.
500	*/
501	if (aPortCount != 16)
502	return setError(E_INVALIDARG,
503	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
504	aPortCount, 16, 16);
505	break;
506	}
507	case StorageBus_IDE:
508	{
509	/*
510	* The port count is fixed to 2.
511	*/
512	if (aPortCount != 2)
513	return setError(E_INVALIDARG,
514	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
515	aPortCount, 2, 2);
516	break;
517	}
518	case StorageBus_Floppy:
519	{
520	/*
521	* The port count is fixed to 1.
522	*/
523	if (aPortCount != 1)
524	return setError(E_INVALIDARG,
525	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
526	aPortCount, 1, 1);
527	break;
528	}
529	case StorageBus_SAS:
530	{
531	/* SAS supports a maximum of 255 ports. */
532	if (aPortCount < 1 \|\| aPortCount > 255)
533	return setError(E_INVALIDARG,
534	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
535	aPortCount, 1, 255);
536	break;
537	}
538	case StorageBus_USB:
539	{
540	/*
541	* The port count is fixed to 8.
542	*/
543	if (aPortCount != 8)
544	return setError(E_INVALIDARG,
545	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
546	aPortCount, 8, 8);
547	break;
548	}
549	default:
550	AssertMsgFailed(("Invalid controller type %d\n", m->bd->mStorageBus));
551	}
552
553	if (m->bd->mPortCount != aPortCount)
554	{
555	m->bd.backup();
556	m->bd->mPortCount = aPortCount;
557
558	alock.release();
559	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
560	m->pParent->i_setModified(Machine::IsModified_Storage);
561	mlock.release();
562
563	m->pParent->i_onStorageControllerChange();
564	}
565
566	return S_OK;
567	}
568
569	HRESULT StorageController::getInstance(ULONG *aInstance)
570	{
571	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
572
573	*aInstance = m->bd->mInstance;
574
575	return S_OK;
576	}
577
578	HRESULT StorageController::setInstance(ULONG aInstance)
579	{
580	/* the machine needs to be mutable */
581	AutoMutableStateDependency adep(m->pParent);
582	if (FAILED(adep.rc())) return adep.rc();
583
584	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
585
586	if (m->bd->mInstance != aInstance)
587	{
588	m->bd.backup();
589	m->bd->mInstance = aInstance;
590
591	alock.release();
592	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
593	m->pParent->i_setModified(Machine::IsModified_Storage);
594	mlock.release();
595
596	m->pParent->i_onStorageControllerChange();
597	}
598
599	return S_OK;
600	}
601
602	HRESULT StorageController::getUseHostIOCache(BOOL *fUseHostIOCache)
603	{
604	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
605
606	*fUseHostIOCache = m->bd->fUseHostIOCache;
607
608	return S_OK;
609	}
610
611	HRESULT StorageController::setUseHostIOCache(BOOL fUseHostIOCache)
612	{
613	/* the machine needs to be mutable */
614	AutoMutableStateDependency adep(m->pParent);
615	if (FAILED(adep.rc())) return adep.rc();
616
617	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
618
619	if (m->bd->fUseHostIOCache != !!fUseHostIOCache)
620	{
621	m->bd.backup();
622	m->bd->fUseHostIOCache = !!fUseHostIOCache;
623
624	alock.release();
625	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
626	m->pParent->i_setModified(Machine::IsModified_Storage);
627	mlock.release();
628
629	m->pParent->i_onStorageControllerChange();
630	}
631
632	return S_OK;
633	}
634
635	HRESULT StorageController::getBootable(BOOL *fBootable)
636	{
637	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
638
639	*fBootable = m->bd->fBootable;
640
641	return S_OK;
642	}
643
644	// public methods only for internal purposes
645	/////////////////////////////////////////////////////////////////////////////
646
647	const Utf8Str& StorageController::i_getName() const
648	{
649	return m->bd->strName;
650	}
651
652	StorageControllerType_T StorageController::i_getControllerType() const
653	{
654	return m->bd->mStorageControllerType;
655	}
656
657	StorageBus_T StorageController::i_getStorageBus() const
658	{
659	return m->bd->mStorageBus;
660	}
661
662	ULONG StorageController::i_getInstance() const
663	{
664	return m->bd->mInstance;
665	}
666
667	bool StorageController::i_getBootable() const
668	{
669	return !!m->bd->fBootable;
670	}
671
672	/**
673	* Returns S_OK if the given port and device numbers are within the range supported
674	* by this controller. If not, it sets an error and returns E_INVALIDARG.
675	* @param ulPort
676	* @param ulDevice
677	* @return
678	*/
679	HRESULT StorageController::i_checkPortAndDeviceValid(LONG aControllerPort,
680	LONG aDevice)
681	{
682	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
683
684	ULONG portCount = m->bd->mPortCount;
685	ULONG devicesPerPort;
686	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->mStorageBus, &devicesPerPort);
687	if (FAILED(rc)) return rc;
688
689	if ( aControllerPort < 0
690	\|\| aControllerPort >= (LONG)portCount
691	\|\| aDevice < 0
692	\|\| aDevice >= (LONG)devicesPerPort
693	)
694	return setError(E_INVALIDARG,
695	tr("The port and/or device parameter are out of range: port=%d (must be in range [0, %d]), device=%d (must be in range [0, %d])"),
696	(int)aControllerPort, (int)portCount-1, (int)aDevice, (int)devicesPerPort-1);
697
698	return S_OK;
699	}
700
701	/** @note Locks objects for writing! */
702	void StorageController::i_setBootable(BOOL fBootable)
703	{
704	AutoCaller autoCaller(this);
705	AssertComRCReturnVoid(autoCaller.rc());
706
707	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
708
709	m->bd.backup();
710	m->bd->fBootable = fBootable;
711	}
712
713	/** @note Locks objects for writing! */
714	void StorageController::i_rollback()
715	{
716	AutoCaller autoCaller(this);
717	AssertComRCReturnVoid(autoCaller.rc());
718
719	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
720
721	m->bd.rollback();
722	}
723
724	/**
725	* @note Locks this object for writing, together with the peer object (also
726	* for writing) if there is one.
727	*/
728	void StorageController::i_commit()
729	{
730	/* sanity */
731	AutoCaller autoCaller(this);
732	AssertComRCReturnVoid (autoCaller.rc());
733
734	/* sanity too */
735	AutoCaller peerCaller (m->pPeer);
736	AssertComRCReturnVoid (peerCaller.rc());
737
738	/* lock both for writing since we modify both (m->pPeer is "master" so locked
739	* first) */
740	AutoMultiWriteLock2 alock(m->pPeer, this COMMA_LOCKVAL_SRC_POS);
741
742	if (m->bd.isBackedUp())
743	{
744	m->bd.commit();
745	if (m->pPeer)
746	{
747	// attach new data to the peer and reshare it
748	m->pPeer->m->bd.attach (m->bd);
749	}
750	}
751	}
752
753	/**
754	* Cancels sharing (if any) by making an independent copy of data.
755	* This operation also resets this object's peer to NULL.
756	*
757	* @note Locks this object for writing, together with the peer object
758	* represented by @a aThat (locked for reading).
759	*/
760	void StorageController::i_unshare()
761	{
762	/* sanity */
763	AutoCaller autoCaller(this);
764	AssertComRCReturnVoid (autoCaller.rc());
765
766	/* sanity too */
767	AutoCaller peerCaller (m->pPeer);
768	AssertComRCReturnVoid (peerCaller.rc());
769
770	/* peer is not modified, lock it for reading (m->pPeer is "master" so locked
771	* first) */
772	AutoReadLock rl(m->pPeer COMMA_LOCKVAL_SRC_POS);
773	AutoWriteLock wl(this COMMA_LOCKVAL_SRC_POS);
774
775	if (m->bd.isShared())
776	{
777	if (!m->bd.isBackedUp())
778	m->bd.backup();
779
780	m->bd.commit();
781	}
782
783	unconst(m->pPeer) = NULL;
784	}
785
786	Machine* StorageController::i_getMachine()
787	{
788	return m->pParent;
789	}
790
791	ComObjPtr<StorageController> StorageController::i_getPeer()
792	{
793	return m->pPeer;
794	}
795
796	// private methods
797	/////////////////////////////////////////////////////////////////////////////
798
799
800	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp@ 56574

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