StorageControllerImpl.cpp@ 63503

Last change on this file since 63503 was 63172, checked in by vboxsync, 8 years ago
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1	/* $Id: StorageControllerImpl.cpp 63172 2016-08-08 14:44:53Z vboxsync $ */
2
3	/** @file
4	*
5	* Implementation of IStorageController.
6	*/
7
8	/*
9	* Copyright (C) 2008-2016 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	struct StorageController::Data
41	{
42	Data(Machine * const aMachine)
43	: pVirtualBox(NULL),
44	pSystemProperties(NULL),
45	pParent(aMachine)
46	{
47	unconst(pVirtualBox) = aMachine->i_getVirtualBox();
48	unconst(pSystemProperties) = pVirtualBox->i_getSystemProperties();
49	}
50
51	VirtualBox * const pVirtualBox;
52	SystemProperties * const pSystemProperties;
53	Machine * const pParent;
54	const ComObjPtr<StorageController> pPeer;
55
56	Backupable<settings::StorageController> bd;
57	};
58
59
60	// constructor / destructor
61	/////////////////////////////////////////////////////////////////////////////
62
63	DEFINE_EMPTY_CTOR_DTOR(StorageController)
64
65	HRESULT StorageController::FinalConstruct()
66	{
67	return BaseFinalConstruct();
68	}
69
70	void StorageController::FinalRelease()
71	{
72	uninit();
73	BaseFinalRelease();
74	}
75
76	// public initializer/uninitializer for internal purposes only
77	/////////////////////////////////////////////////////////////////////////////
78
79	/**
80	* Initializes the storage controller object.
81	*
82	* @returns COM result indicator.
83	* @param aParent Pointer to our parent object.
84	* @param aName Name of the storage controller.
85	* @param aInstance Instance number of the storage controller.
86	*/
87	HRESULT StorageController::init(Machine *aParent,
88	const Utf8Str &aName,
89	StorageBus_T aStorageBus,
90	ULONG aInstance, bool fBootable)
91	{
92	LogFlowThisFunc(("aParent=%p aName=\"%s\" aInstance=%u\n",
93	aParent, aName.c_str(), aInstance));
94
95	ComAssertRet(aParent && !aName.isEmpty(), E_INVALIDARG);
96	if ( (aStorageBus <= StorageBus_Null)
97	\|\| (aStorageBus > StorageBus_PCIe))
98	return setError(E_INVALIDARG,
99	tr("Invalid storage connection type"));
100
101	ULONG maxInstances;
102	ChipsetType_T chipsetType;
103	HRESULT rc = aParent->COMGETTER(ChipsetType)(&chipsetType);
104	if (FAILED(rc))
105	return rc;
106	rc = aParent->i_getVirtualBox()->i_getSystemProperties()->
107	GetMaxInstancesOfStorageBus(chipsetType, aStorageBus, &maxInstances);
108	if (FAILED(rc))
109	return rc;
110	if (aInstance >= maxInstances)
111	return setError(E_INVALIDARG,
112	tr("Too many storage controllers of this type"));
113
114	/* Enclose the state transition NotReady->InInit->Ready */
115	AutoInitSpan autoInitSpan(this);
116	AssertReturn(autoInitSpan.isOk(), E_FAIL);
117
118	m = new Data(aParent);
119
120	/* m->pPeer is left null */
121
122	m->bd.allocate();
123
124	m->bd->strName = aName;
125	m->bd->ulInstance = aInstance;
126	m->bd->fBootable = fBootable;
127	m->bd->storageBus = aStorageBus;
128	if ( aStorageBus != StorageBus_IDE
129	&& aStorageBus != StorageBus_Floppy)
130	m->bd->fUseHostIOCache = false;
131	else
132	m->bd->fUseHostIOCache = true;
133
134	switch (aStorageBus)
135	{
136	case StorageBus_IDE:
137	m->bd->ulPortCount = 2;
138	m->bd->controllerType = StorageControllerType_PIIX4;
139	break;
140	case StorageBus_SATA:
141	m->bd->ulPortCount = 30;
142	m->bd->controllerType = StorageControllerType_IntelAhci;
143	break;
144	case StorageBus_SCSI:
145	m->bd->ulPortCount = 16;
146	m->bd->controllerType = StorageControllerType_LsiLogic;
147	break;
148	case StorageBus_Floppy:
149	m->bd->ulPortCount = 1;
150	m->bd->controllerType = StorageControllerType_I82078;
151	break;
152	case StorageBus_SAS:
153	m->bd->ulPortCount = 8;
154	m->bd->controllerType = StorageControllerType_LsiLogicSas;
155	case StorageBus_USB:
156	m->bd->ulPortCount = 8;
157	m->bd->controllerType = StorageControllerType_USB;
158	break;
159	case StorageBus_PCIe:
160	m->bd->ulPortCount = 1;
161	m->bd->controllerType = StorageControllerType_NVMe;
162	break;
163	case StorageBus_Null: break; /* Shut up MSC. */
164	}
165
166	/* Confirm a successful initialization */
167	autoInitSpan.setSucceeded();
168
169	return S_OK;
170	}
171
172	/**
173	* Initializes the object given another object
174	* (a kind of copy constructor). This object shares data with
175	* the object passed as an argument.
176	*
177	* @param aReshare
178	* When false, the original object will remain a data owner.
179	* Otherwise, data ownership will be transferred from the original
180	* object to this one.
181	*
182	* @note This object must be destroyed before the original object
183	* it shares data with is destroyed.
184	*
185	* @note Locks @a aThat object for writing if @a aReshare is @c true, or for
186	* reading if @a aReshare is false.
187	*/
188	HRESULT StorageController::init(Machine *aParent,
189	StorageController *aThat,
190	bool aReshare /* = false */)
191	{
192	LogFlowThisFunc(("aParent=%p, aThat=%p, aReshare=%RTbool\n",
193	aParent, aThat, aReshare));
194
195	ComAssertRet(aParent && aThat, E_INVALIDARG);
196
197	/* Enclose the state transition NotReady->InInit->Ready */
198	AutoInitSpan autoInitSpan(this);
199	AssertReturn(autoInitSpan.isOk(), E_FAIL);
200
201	m = new Data(aParent);
202
203	/* sanity */
204	AutoCaller thatCaller(aThat);
205	AssertComRCReturnRC(thatCaller.rc());
206
207	if (aReshare)
208	{
209	AutoWriteLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
210
211	unconst(aThat->m->pPeer) = this;
212	m->bd.attach(aThat->m->bd);
213	}
214	else
215	{
216	unconst(m->pPeer) = aThat;
217
218	AutoReadLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
219	m->bd.share(aThat->m->bd);
220	}
221
222	/* Confirm successful initialization */
223	autoInitSpan.setSucceeded();
224
225	return S_OK;
226	}
227
228	/**
229	* Initializes the storage controller object given another guest object
230	* (a kind of copy constructor). This object makes a private copy of data
231	* of the original object passed as an argument.
232	*/
233	HRESULT StorageController::initCopy(Machine aParent, StorageController aThat)
234	{
235	LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));
236
237	ComAssertRet(aParent && aThat, E_INVALIDARG);
238
239	/* Enclose the state transition NotReady->InInit->Ready */
240	AutoInitSpan autoInitSpan(this);
241	AssertReturn(autoInitSpan.isOk(), E_FAIL);
242
243	m = new Data(aParent);
244	/* m->pPeer is left null */
245
246	AutoCaller thatCaller(aThat);
247	AssertComRCReturnRC(thatCaller.rc());
248
249	AutoReadLock thatlock(aThat COMMA_LOCKVAL_SRC_POS);
250	m->bd.attachCopy(aThat->m->bd);
251
252	/* Confirm a successful initialization */
253	autoInitSpan.setSucceeded();
254
255	return S_OK;
256	}
257
258
259	/**
260	* Uninitializes the instance and sets the ready flag to FALSE.
261	* Called either from FinalRelease() or by the parent when it gets destroyed.
262	*/
263	void StorageController::uninit()
264	{
265	LogFlowThisFunc(("\n"));
266
267	/* Enclose the state transition Ready->InUninit->NotReady */
268	AutoUninitSpan autoUninitSpan(this);
269	if (autoUninitSpan.uninitDone())
270	return;
271
272	m->bd.free();
273
274	unconst(m->pPeer) = NULL;
275	unconst(m->pParent) = NULL;
276
277	delete m;
278	m = NULL;
279	}
280
281
282	// IStorageController properties
283	HRESULT StorageController::getName(com::Utf8Str &aName)
284	{
285	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
286
287	aName = m->bd->strName;
288
289	return S_OK;
290	}
291
292	HRESULT StorageController::setName(const com::Utf8Str &aName)
293	{
294	/* the machine needs to be mutable */
295	AutoMutableStateDependency adep(m->pParent);
296	if (FAILED(adep.rc())) return adep.rc();
297
298	AutoMultiWriteLock2 alock(m->pParent, this COMMA_LOCKVAL_SRC_POS);
299
300	if (m->bd->strName != aName)
301	{
302	ComObjPtr<StorageController> ctrl;
303	HRESULT rc = m->pParent->i_getStorageControllerByName(aName, ctrl, false /* aSetError */);
304	if (SUCCEEDED(rc))
305	return setError(VBOX_E_OBJECT_IN_USE,
306	tr("Storage controller named '%s' already exists"),
307	aName.c_str());
308
309	Machine::MediaData::AttachmentList atts;
310	rc = m->pParent->i_getMediumAttachmentsOfController(m->bd->strName, atts);
311	for (Machine::MediaData::AttachmentList::const_iterator it = atts.begin();
312	it != atts.end();
313	++it)
314	{
315	IMediumAttachment iA = it;
316	MediumAttachment pAttach = static_cast<MediumAttachment >(iA);
317	AutoWriteLock attlock(pAttach COMMA_LOCKVAL_SRC_POS);
318	pAttach->i_updateName(aName);
319	}
320
321
322	m->bd.backup();
323	m->bd->strName = aName;
324
325	m->pParent->i_setModified(Machine::IsModified_Storage);
326	alock.release();
327
328	m->pParent->i_onStorageControllerChange();
329	}
330
331	return S_OK;
332	}
333
334	HRESULT StorageController::getBus(StorageBus_T *aBus)
335	{
336	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
337
338	*aBus = m->bd->storageBus;
339
340	return S_OK;
341	}
342
343	HRESULT StorageController::getControllerType(StorageControllerType_T *aControllerType)
344	{
345	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
346
347	*aControllerType = m->bd->controllerType;
348
349	return S_OK;
350	}
351
352	HRESULT StorageController::setControllerType(StorageControllerType_T aControllerType)
353	{
354	/* the machine needs to be mutable */
355	AutoMutableStateDependency adep(m->pParent);
356	if (FAILED(adep.rc())) return adep.rc();
357
358	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
359
360	HRESULT rc = S_OK;
361
362	switch (m->bd->storageBus)
363	{
364	case StorageBus_IDE:
365	{
366	if ( (aControllerType != StorageControllerType_PIIX3)
367	&& (aControllerType != StorageControllerType_PIIX4)
368	&& (aControllerType != StorageControllerType_ICH6))
369	rc = E_INVALIDARG;
370	break;
371	}
372	case StorageBus_SATA:
373	{
374	if (aControllerType != StorageControllerType_IntelAhci)
375	rc = E_INVALIDARG;
376	break;
377	}
378	case StorageBus_SCSI:
379	{
380	if ( (aControllerType != StorageControllerType_LsiLogic)
381	&& (aControllerType != StorageControllerType_BusLogic))
382	rc = E_INVALIDARG;
383	break;
384	}
385	case StorageBus_Floppy:
386	{
387	if (aControllerType != StorageControllerType_I82078)
388	rc = E_INVALIDARG;
389	break;
390	}
391	case StorageBus_SAS:
392	{
393	if (aControllerType != StorageControllerType_LsiLogicSas)
394	rc = E_INVALIDARG;
395	break;
396	}
397	case StorageBus_USB:
398	{
399	if (aControllerType != StorageControllerType_USB)
400	rc = E_INVALIDARG;
401	break;
402	}
403	case StorageBus_PCIe:
404	{
405	if (aControllerType != StorageControllerType_NVMe)
406	rc = E_INVALIDARG;
407	break;
408	}
409	default:
410	AssertMsgFailed(("Invalid controller type %d\n", m->bd->storageBus));
411	rc = E_INVALIDARG;
412	}
413
414	if (!SUCCEEDED(rc))
415	return setError(rc,
416	tr("Invalid controller type %d"),
417	aControllerType);
418
419	if (m->bd->controllerType != aControllerType)
420	{
421	m->bd.backup();
422	m->bd->controllerType = aControllerType;
423
424	alock.release();
425	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
426	m->pParent->i_setModified(Machine::IsModified_Storage);
427	mlock.release();
428
429	m->pParent->i_onStorageControllerChange();
430	}
431
432	return S_OK;
433	}
434
435	HRESULT StorageController::getMaxDevicesPerPortCount(ULONG *aMaxDevicesPerPortCount)
436	{
437	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
438
439	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->storageBus, aMaxDevicesPerPortCount);
440
441	return rc;
442	}
443
444	HRESULT StorageController::getMinPortCount(ULONG *aMinPortCount)
445	{
446	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
447
448	HRESULT rc = m->pSystemProperties->GetMinPortCountForStorageBus(m->bd->storageBus, aMinPortCount);
449	return rc;
450	}
451
452	HRESULT StorageController::getMaxPortCount(ULONG *aMaxPortCount)
453	{
454	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
455	HRESULT rc = m->pSystemProperties->GetMaxPortCountForStorageBus(m->bd->storageBus, aMaxPortCount);
456
457	return rc;
458	}
459
460	HRESULT StorageController::getPortCount(ULONG *aPortCount)
461	{
462	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
463
464	*aPortCount = m->bd->ulPortCount;
465
466	return S_OK;
467	}
468
469	HRESULT StorageController::setPortCount(ULONG aPortCount)
470	{
471	/* the machine needs to be mutable */
472	AutoMutableStateDependency adep(m->pParent);
473	if (FAILED(adep.rc())) return adep.rc();
474
475	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
476
477	switch (m->bd->storageBus)
478	{
479	case StorageBus_SATA:
480	{
481	/* AHCI SATA supports a maximum of 30 ports. */
482	if (aPortCount < 1 \|\| aPortCount > 30)
483	return setError(E_INVALIDARG,
484	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
485	aPortCount, 1, 30);
486	break;
487	}
488	case StorageBus_SCSI:
489	{
490	/*
491	* SCSI does not support setting different ports.
492	* (doesn't make sense here either).
493	* The maximum and minimum is 16 and unless the callee
494	* tries to set a different value we return an error.
495	*/
496	if (aPortCount != 16)
497	return setError(E_INVALIDARG,
498	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
499	aPortCount, 16, 16);
500	break;
501	}
502	case StorageBus_IDE:
503	{
504	/*
505	* The port count is fixed to 2.
506	*/
507	if (aPortCount != 2)
508	return setError(E_INVALIDARG,
509	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
510	aPortCount, 2, 2);
511	break;
512	}
513	case StorageBus_Floppy:
514	{
515	/*
516	* The port count is fixed to 1.
517	*/
518	if (aPortCount != 1)
519	return setError(E_INVALIDARG,
520	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
521	aPortCount, 1, 1);
522	break;
523	}
524	case StorageBus_SAS:
525	{
526	/* SAS supports a maximum of 255 ports. */
527	if (aPortCount < 1 \|\| aPortCount > 255)
528	return setError(E_INVALIDARG,
529	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
530	aPortCount, 1, 255);
531	break;
532	}
533	case StorageBus_USB:
534	{
535	/*
536	* The port count is fixed to 8.
537	*/
538	if (aPortCount != 8)
539	return setError(E_INVALIDARG,
540	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
541	aPortCount, 8, 8);
542	break;
543	}
544	case StorageBus_PCIe:
545	{
546	/*
547	* PCIe (NVMe in particular) supports theoretically 2^32 - 1
548	* different namespaces, limit the amount artifically here.
549	*/
550	if (aPortCount < 1 \|\| aPortCount > 255)
551	return setError(E_INVALIDARG,
552	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
553	aPortCount, 1, 255);
554	break;
555	}
556	default:
557	AssertMsgFailed(("Invalid controller type %d\n", m->bd->storageBus));
558	}
559
560	if (m->bd->ulPortCount != aPortCount)
561	{
562	m->bd.backup();
563	m->bd->ulPortCount = aPortCount;
564
565	alock.release();
566	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
567	m->pParent->i_setModified(Machine::IsModified_Storage);
568	mlock.release();
569
570	m->pParent->i_onStorageControllerChange();
571	}
572
573	return S_OK;
574	}
575
576	HRESULT StorageController::getInstance(ULONG *aInstance)
577	{
578	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
579
580	*aInstance = m->bd->ulInstance;
581
582	return S_OK;
583	}
584
585	HRESULT StorageController::setInstance(ULONG aInstance)
586	{
587	/* the machine needs to be mutable */
588	AutoMutableStateDependency adep(m->pParent);
589	if (FAILED(adep.rc())) return adep.rc();
590
591	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
592
593	if (m->bd->ulInstance != aInstance)
594	{
595	m->bd.backup();
596	m->bd->ulInstance = aInstance;
597
598	alock.release();
599	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
600	m->pParent->i_setModified(Machine::IsModified_Storage);
601	mlock.release();
602
603	m->pParent->i_onStorageControllerChange();
604	}
605
606	return S_OK;
607	}
608
609	HRESULT StorageController::getUseHostIOCache(BOOL *fUseHostIOCache)
610	{
611	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
612
613	*fUseHostIOCache = m->bd->fUseHostIOCache;
614
615	return S_OK;
616	}
617
618	HRESULT StorageController::setUseHostIOCache(BOOL fUseHostIOCache)
619	{
620	/* the machine needs to be mutable */
621	AutoMutableStateDependency adep(m->pParent);
622	if (FAILED(adep.rc())) return adep.rc();
623
624	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
625
626	if (m->bd->fUseHostIOCache != !!fUseHostIOCache)
627	{
628	m->bd.backup();
629	m->bd->fUseHostIOCache = !!fUseHostIOCache;
630
631	alock.release();
632	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
633	m->pParent->i_setModified(Machine::IsModified_Storage);
634	mlock.release();
635
636	m->pParent->i_onStorageControllerChange();
637	}
638
639	return S_OK;
640	}
641
642	HRESULT StorageController::getBootable(BOOL *fBootable)
643	{
644	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
645
646	*fBootable = m->bd->fBootable;
647
648	return S_OK;
649	}
650
651	// public methods only for internal purposes
652	/////////////////////////////////////////////////////////////////////////////
653
654	const Utf8Str& StorageController::i_getName() const
655	{
656	return m->bd->strName;
657	}
658
659	StorageControllerType_T StorageController::i_getControllerType() const
660	{
661	return m->bd->controllerType;
662	}
663
664	StorageBus_T StorageController::i_getStorageBus() const
665	{
666	return m->bd->storageBus;
667	}
668
669	ULONG StorageController::i_getInstance() const
670	{
671	return m->bd->ulInstance;
672	}
673
674	bool StorageController::i_getBootable() const
675	{
676	return !!m->bd->fBootable;
677	}
678
679	/**
680	* Checks the validity of a port and device number.
681	*
682	* @retval S_OK If the given port and device numbers are within the range
683	* supported by this controller.
684	* @retval E_INVALIDARG If not. Sets an error.
685	* @param aControllerPort Controller port number.
686	* @param aDevice Device number.
687	*/
688	HRESULT StorageController::i_checkPortAndDeviceValid(LONG aControllerPort,
689	LONG aDevice)
690	{
691	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
692
693	ULONG portCount = m->bd->ulPortCount;
694	ULONG devicesPerPort;
695	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->storageBus, &devicesPerPort);
696	if (FAILED(rc)) return rc;
697
698	if ( aControllerPort < 0
699	\|\| aControllerPort >= (LONG)portCount
700	\|\| aDevice < 0
701	\|\| aDevice >= (LONG)devicesPerPort
702	)
703	return setError(E_INVALIDARG,
704	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])"),
705	(int)aControllerPort, (int)portCount-1, (int)aDevice, (int)devicesPerPort-1);
706
707	return S_OK;
708	}
709
710	/** @note Locks objects for writing! */
711	void StorageController::i_setBootable(BOOL fBootable)
712	{
713	AutoCaller autoCaller(this);
714	AssertComRCReturnVoid(autoCaller.rc());
715
716	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
717
718	m->bd.backup();
719	m->bd->fBootable = RT_BOOL(fBootable);
720	}
721
722	/** @note Locks objects for writing! */
723	void StorageController::i_rollback()
724	{
725	AutoCaller autoCaller(this);
726	AssertComRCReturnVoid(autoCaller.rc());
727
728	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
729
730	m->bd.rollback();
731	}
732
733	/**
734	* @note Locks this object for writing, together with the peer object (also
735	* for writing) if there is one.
736	*/
737	void StorageController::i_commit()
738	{
739	/* sanity */
740	AutoCaller autoCaller(this);
741	AssertComRCReturnVoid(autoCaller.rc());
742
743	/* sanity too */
744	AutoCaller peerCaller(m->pPeer);
745	AssertComRCReturnVoid(peerCaller.rc());
746
747	/* lock both for writing since we modify both (m->pPeer is "master" so locked
748	* first) */
749	AutoMultiWriteLock2 alock(m->pPeer, this COMMA_LOCKVAL_SRC_POS);
750
751	if (m->bd.isBackedUp())
752	{
753	m->bd.commit();
754	if (m->pPeer)
755	{
756	// attach new data to the peer and reshare it
757	m->pPeer->m->bd.attach(m->bd);
758	}
759	}
760	}
761
762	/**
763	* Cancels sharing (if any) by making an independent copy of data.
764	* This operation also resets this object's peer to NULL.
765	*
766	* @note Locks this object for writing, together with the peer object
767	* represented by @a aThat (locked for reading).
768	*/
769	void StorageController::i_unshare()
770	{
771	/* sanity */
772	AutoCaller autoCaller(this);
773	AssertComRCReturnVoid(autoCaller.rc());
774
775	/* sanity too */
776	AutoCaller peerCaller(m->pPeer);
777	AssertComRCReturnVoid(peerCaller.rc());
778
779	/* peer is not modified, lock it for reading (m->pPeer is "master" so locked
780	* first) */
781	AutoReadLock rl(m->pPeer COMMA_LOCKVAL_SRC_POS);
782	AutoWriteLock wl(this COMMA_LOCKVAL_SRC_POS);
783
784	if (m->bd.isShared())
785	{
786	if (!m->bd.isBackedUp())
787	m->bd.backup();
788
789	m->bd.commit();
790	}
791
792	unconst(m->pPeer) = NULL;
793	}
794
795	Machine* StorageController::i_getMachine()
796	{
797	return m->pParent;
798	}
799
800	ComObjPtr<StorageController> StorageController::i_getPeer()
801	{
802	return m->pPeer;
803	}
804
805	// private methods
806	/////////////////////////////////////////////////////////////////////////////
807
808
809	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp@ 63503

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