StorageControllerImpl.cpp@ 72899

Last change on this file since 72899 was 66126, checked in by vboxsync, 8 years ago
Main/Machine+Snapshot+Appliance+StorageController: eliminate the one-member struct MediaData, as a preparation for later eliminating the Backupable<> template use in combination with anything containing a ComObjPtr (since these are not handled in a sensible way when creating a session or a snapshot anyway, needing more effort to fix than do right from the beginning). Additionally a lot of iterator loop cleanups, making proper use of scoping and const_iterator whenever possible. Also take the opportunity to improve the readability of some quite long lines. No behavior change intended.
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File size: 22.9 KB

Line
1	/* $Id: StorageControllerImpl.cpp 66126 2017-03-16 14:06:27Z vboxsync $ */
2
3	/** @file
4	*
5	* Implementation of IStorageController.
6	*/
7
8	/*
9	* Copyright (C) 2008-2017 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 aStorageBus Type of the storage bus.
86	* @param aInstance Instance number of the storage controller.
87	* @param fBootable Bootable flag.
88	*/
89	HRESULT StorageController::init(Machine *aParent,
90	const Utf8Str &aName,
91	StorageBus_T aStorageBus,
92	ULONG aInstance, bool fBootable)
93	{
94	LogFlowThisFunc(("aParent=%p aName=\"%s\" aInstance=%u\n",
95	aParent, aName.c_str(), aInstance));
96
97	ComAssertRet(aParent && !aName.isEmpty(), E_INVALIDARG);
98	if ( (aStorageBus <= StorageBus_Null)
99	\|\| (aStorageBus > StorageBus_PCIe))
100	return setError(E_INVALIDARG,
101	tr("Invalid storage connection type"));
102
103	ULONG maxInstances;
104	ChipsetType_T chipsetType;
105	HRESULT rc = aParent->COMGETTER(ChipsetType)(&chipsetType);
106	if (FAILED(rc))
107	return rc;
108	rc = aParent->i_getVirtualBox()->i_getSystemProperties()->
109	GetMaxInstancesOfStorageBus(chipsetType, aStorageBus, &maxInstances);
110	if (FAILED(rc))
111	return rc;
112	if (aInstance >= maxInstances)
113	return setError(E_INVALIDARG,
114	tr("Too many storage controllers of this type"));
115
116	/* Enclose the state transition NotReady->InInit->Ready */
117	AutoInitSpan autoInitSpan(this);
118	AssertReturn(autoInitSpan.isOk(), E_FAIL);
119
120	m = new Data(aParent);
121
122	/* m->pPeer is left null */
123
124	m->bd.allocate();
125
126	m->bd->strName = aName;
127	m->bd->ulInstance = aInstance;
128	m->bd->fBootable = fBootable;
129	m->bd->storageBus = aStorageBus;
130	if ( aStorageBus != StorageBus_IDE
131	&& aStorageBus != StorageBus_Floppy)
132	m->bd->fUseHostIOCache = false;
133	else
134	m->bd->fUseHostIOCache = true;
135
136	switch (aStorageBus)
137	{
138	case StorageBus_IDE:
139	m->bd->ulPortCount = 2;
140	m->bd->controllerType = StorageControllerType_PIIX4;
141	break;
142	case StorageBus_SATA:
143	m->bd->ulPortCount = 30;
144	m->bd->controllerType = StorageControllerType_IntelAhci;
145	break;
146	case StorageBus_SCSI:
147	m->bd->ulPortCount = 16;
148	m->bd->controllerType = StorageControllerType_LsiLogic;
149	break;
150	case StorageBus_Floppy:
151	m->bd->ulPortCount = 1;
152	m->bd->controllerType = StorageControllerType_I82078;
153	break;
154	case StorageBus_SAS:
155	m->bd->ulPortCount = 8;
156	m->bd->controllerType = StorageControllerType_LsiLogicSas;
157	break;
158	case StorageBus_USB:
159	m->bd->ulPortCount = 8;
160	m->bd->controllerType = StorageControllerType_USB;
161	break;
162	case StorageBus_PCIe:
163	m->bd->ulPortCount = 1;
164	m->bd->controllerType = StorageControllerType_NVMe;
165	break;
166	case StorageBus_Null: break; /* Shut up MSC. */
167	}
168
169	/* Confirm a successful initialization */
170	autoInitSpan.setSucceeded();
171
172	return S_OK;
173	}
174
175	/**
176	* Initializes the object given another object
177	* (a kind of copy constructor). This object shares data with
178	* the object passed as an argument.
179	*
180	* @param aParent Pointer to our parent object.
181	* @param aThat
182	* @param aReshare
183	* When false, the original object will remain a data owner.
184	* Otherwise, data ownership will be transferred from the original
185	* object to this one.
186	*
187	* @note This object must be destroyed before the original object
188	* it shares data with is destroyed.
189	*
190	* @note Locks @a aThat object for writing if @a aReshare is @c true, or for
191	* reading if @a aReshare is false.
192	*/
193	HRESULT StorageController::init(Machine *aParent,
194	StorageController *aThat,
195	bool aReshare /* = false */)
196	{
197	LogFlowThisFunc(("aParent=%p, aThat=%p, aReshare=%RTbool\n",
198	aParent, aThat, aReshare));
199
200	ComAssertRet(aParent && aThat, E_INVALIDARG);
201
202	/* Enclose the state transition NotReady->InInit->Ready */
203	AutoInitSpan autoInitSpan(this);
204	AssertReturn(autoInitSpan.isOk(), E_FAIL);
205
206	m = new Data(aParent);
207
208	/* sanity */
209	AutoCaller thatCaller(aThat);
210	AssertComRCReturnRC(thatCaller.rc());
211
212	if (aReshare)
213	{
214	AutoWriteLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
215
216	unconst(aThat->m->pPeer) = this;
217	m->bd.attach(aThat->m->bd);
218	}
219	else
220	{
221	unconst(m->pPeer) = aThat;
222
223	AutoReadLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
224	m->bd.share(aThat->m->bd);
225	}
226
227	/* Confirm successful initialization */
228	autoInitSpan.setSucceeded();
229
230	return S_OK;
231	}
232
233	/**
234	* Initializes the storage controller object given another guest object
235	* (a kind of copy constructor). This object makes a private copy of data
236	* of the original object passed as an argument.
237	*/
238	HRESULT StorageController::initCopy(Machine aParent, StorageController aThat)
239	{
240	LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));
241
242	ComAssertRet(aParent && aThat, E_INVALIDARG);
243
244	/* Enclose the state transition NotReady->InInit->Ready */
245	AutoInitSpan autoInitSpan(this);
246	AssertReturn(autoInitSpan.isOk(), E_FAIL);
247
248	m = new Data(aParent);
249	/* m->pPeer is left null */
250
251	AutoCaller thatCaller(aThat);
252	AssertComRCReturnRC(thatCaller.rc());
253
254	AutoReadLock thatlock(aThat COMMA_LOCKVAL_SRC_POS);
255	m->bd.attachCopy(aThat->m->bd);
256
257	/* Confirm a successful initialization */
258	autoInitSpan.setSucceeded();
259
260	return S_OK;
261	}
262
263
264	/**
265	* Uninitializes the instance and sets the ready flag to FALSE.
266	* Called either from FinalRelease() or by the parent when it gets destroyed.
267	*/
268	void StorageController::uninit()
269	{
270	LogFlowThisFunc(("\n"));
271
272	/* Enclose the state transition Ready->InUninit->NotReady */
273	AutoUninitSpan autoUninitSpan(this);
274	if (autoUninitSpan.uninitDone())
275	return;
276
277	m->bd.free();
278
279	unconst(m->pPeer) = NULL;
280	unconst(m->pParent) = NULL;
281
282	delete m;
283	m = NULL;
284	}
285
286
287	// IStorageController properties
288	HRESULT StorageController::getName(com::Utf8Str &aName)
289	{
290	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
291
292	aName = m->bd->strName;
293
294	return S_OK;
295	}
296
297	HRESULT StorageController::setName(const com::Utf8Str &aName)
298	{
299	/* the machine needs to be mutable */
300	AutoMutableStateDependency adep(m->pParent);
301	if (FAILED(adep.rc())) return adep.rc();
302
303	AutoMultiWriteLock2 alock(m->pParent, this COMMA_LOCKVAL_SRC_POS);
304
305	if (m->bd->strName != aName)
306	{
307	ComObjPtr<StorageController> ctrl;
308	HRESULT rc = m->pParent->i_getStorageControllerByName(aName, ctrl, false /* aSetError */);
309	if (SUCCEEDED(rc))
310	return setError(VBOX_E_OBJECT_IN_USE,
311	tr("Storage controller named '%s' already exists"),
312	aName.c_str());
313
314	Machine::MediumAttachmentList atts;
315	rc = m->pParent->i_getMediumAttachmentsOfController(m->bd->strName, atts);
316	for (Machine::MediumAttachmentList::const_iterator
317	it = atts.begin();
318	it != atts.end();
319	++it)
320	{
321	IMediumAttachment iA = it;
322	MediumAttachment pAttach = static_cast<MediumAttachment >(iA);
323	AutoWriteLock attlock(pAttach COMMA_LOCKVAL_SRC_POS);
324	pAttach->i_updateName(aName);
325	}
326
327
328	m->bd.backup();
329	m->bd->strName = aName;
330
331	m->pParent->i_setModified(Machine::IsModified_Storage);
332	alock.release();
333
334	m->pParent->i_onStorageControllerChange();
335	}
336
337	return S_OK;
338	}
339
340	HRESULT StorageController::getBus(StorageBus_T *aBus)
341	{
342	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
343
344	*aBus = m->bd->storageBus;
345
346	return S_OK;
347	}
348
349	HRESULT StorageController::getControllerType(StorageControllerType_T *aControllerType)
350	{
351	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
352
353	*aControllerType = m->bd->controllerType;
354
355	return S_OK;
356	}
357
358	HRESULT StorageController::setControllerType(StorageControllerType_T aControllerType)
359	{
360	/* the machine needs to be mutable */
361	AutoMutableStateDependency adep(m->pParent);
362	if (FAILED(adep.rc())) return adep.rc();
363
364	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
365
366	HRESULT rc = S_OK;
367
368	switch (m->bd->storageBus)
369	{
370	case StorageBus_IDE:
371	{
372	if ( (aControllerType != StorageControllerType_PIIX3)
373	&& (aControllerType != StorageControllerType_PIIX4)
374	&& (aControllerType != StorageControllerType_ICH6))
375	rc = E_INVALIDARG;
376	break;
377	}
378	case StorageBus_SATA:
379	{
380	if (aControllerType != StorageControllerType_IntelAhci)
381	rc = E_INVALIDARG;
382	break;
383	}
384	case StorageBus_SCSI:
385	{
386	if ( (aControllerType != StorageControllerType_LsiLogic)
387	&& (aControllerType != StorageControllerType_BusLogic))
388	rc = E_INVALIDARG;
389	break;
390	}
391	case StorageBus_Floppy:
392	{
393	if (aControllerType != StorageControllerType_I82078)
394	rc = E_INVALIDARG;
395	break;
396	}
397	case StorageBus_SAS:
398	{
399	if (aControllerType != StorageControllerType_LsiLogicSas)
400	rc = E_INVALIDARG;
401	break;
402	}
403	case StorageBus_USB:
404	{
405	if (aControllerType != StorageControllerType_USB)
406	rc = E_INVALIDARG;
407	break;
408	}
409	case StorageBus_PCIe:
410	{
411	if (aControllerType != StorageControllerType_NVMe)
412	rc = E_INVALIDARG;
413	break;
414	}
415	default:
416	AssertMsgFailed(("Invalid controller type %d\n", m->bd->storageBus));
417	rc = E_INVALIDARG;
418	}
419
420	if (!SUCCEEDED(rc))
421	return setError(rc,
422	tr("Invalid controller type %d"),
423	aControllerType);
424
425	if (m->bd->controllerType != aControllerType)
426	{
427	m->bd.backup();
428	m->bd->controllerType = aControllerType;
429
430	alock.release();
431	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
432	m->pParent->i_setModified(Machine::IsModified_Storage);
433	mlock.release();
434
435	m->pParent->i_onStorageControllerChange();
436	}
437
438	return S_OK;
439	}
440
441	HRESULT StorageController::getMaxDevicesPerPortCount(ULONG *aMaxDevicesPerPortCount)
442	{
443	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
444
445	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->storageBus, aMaxDevicesPerPortCount);
446
447	return rc;
448	}
449
450	HRESULT StorageController::getMinPortCount(ULONG *aMinPortCount)
451	{
452	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
453
454	HRESULT rc = m->pSystemProperties->GetMinPortCountForStorageBus(m->bd->storageBus, aMinPortCount);
455	return rc;
456	}
457
458	HRESULT StorageController::getMaxPortCount(ULONG *aMaxPortCount)
459	{
460	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
461	HRESULT rc = m->pSystemProperties->GetMaxPortCountForStorageBus(m->bd->storageBus, aMaxPortCount);
462
463	return rc;
464	}
465
466	HRESULT StorageController::getPortCount(ULONG *aPortCount)
467	{
468	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
469
470	*aPortCount = m->bd->ulPortCount;
471
472	return S_OK;
473	}
474
475	HRESULT StorageController::setPortCount(ULONG aPortCount)
476	{
477	/* the machine needs to be mutable */
478	AutoMutableStateDependency adep(m->pParent);
479	if (FAILED(adep.rc())) return adep.rc();
480
481	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
482
483	switch (m->bd->storageBus)
484	{
485	case StorageBus_SATA:
486	{
487	/* AHCI SATA supports a maximum of 30 ports. */
488	if (aPortCount < 1 \|\| aPortCount > 30)
489	return setError(E_INVALIDARG,
490	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
491	aPortCount, 1, 30);
492	break;
493	}
494	case StorageBus_SCSI:
495	{
496	/*
497	* SCSI does not support setting different ports.
498	* (doesn't make sense here either).
499	* The maximum and minimum is 16 and unless the callee
500	* tries to set a different value we return an error.
501	*/
502	if (aPortCount != 16)
503	return setError(E_INVALIDARG,
504	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
505	aPortCount, 16, 16);
506	break;
507	}
508	case StorageBus_IDE:
509	{
510	/*
511	* The port count is fixed to 2.
512	*/
513	if (aPortCount != 2)
514	return setError(E_INVALIDARG,
515	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
516	aPortCount, 2, 2);
517	break;
518	}
519	case StorageBus_Floppy:
520	{
521	/*
522	* The port count is fixed to 1.
523	*/
524	if (aPortCount != 1)
525	return setError(E_INVALIDARG,
526	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
527	aPortCount, 1, 1);
528	break;
529	}
530	case StorageBus_SAS:
531	{
532	/* SAS supports a maximum of 255 ports. */
533	if (aPortCount < 1 \|\| aPortCount > 255)
534	return setError(E_INVALIDARG,
535	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
536	aPortCount, 1, 255);
537	break;
538	}
539	case StorageBus_USB:
540	{
541	/*
542	* The port count is fixed to 8.
543	*/
544	if (aPortCount != 8)
545	return setError(E_INVALIDARG,
546	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
547	aPortCount, 8, 8);
548	break;
549	}
550	case StorageBus_PCIe:
551	{
552	/*
553	* PCIe (NVMe in particular) supports theoretically 2^32 - 1
554	* different namespaces, limit the amount artifically here.
555	*/
556	if (aPortCount < 1 \|\| aPortCount > 255)
557	return setError(E_INVALIDARG,
558	tr("Invalid port count: %lu (must be in range [%lu, %lu])"),
559	aPortCount, 1, 255);
560	break;
561	}
562	default:
563	AssertMsgFailed(("Invalid controller type %d\n", m->bd->storageBus));
564	}
565
566	if (m->bd->ulPortCount != aPortCount)
567	{
568	m->bd.backup();
569	m->bd->ulPortCount = aPortCount;
570
571	alock.release();
572	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
573	m->pParent->i_setModified(Machine::IsModified_Storage);
574	mlock.release();
575
576	m->pParent->i_onStorageControllerChange();
577	}
578
579	return S_OK;
580	}
581
582	HRESULT StorageController::getInstance(ULONG *aInstance)
583	{
584	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
585
586	*aInstance = m->bd->ulInstance;
587
588	return S_OK;
589	}
590
591	HRESULT StorageController::setInstance(ULONG aInstance)
592	{
593	/* the machine needs to be mutable */
594	AutoMutableStateDependency adep(m->pParent);
595	if (FAILED(adep.rc())) return adep.rc();
596
597	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
598
599	if (m->bd->ulInstance != aInstance)
600	{
601	m->bd.backup();
602	m->bd->ulInstance = aInstance;
603
604	alock.release();
605	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
606	m->pParent->i_setModified(Machine::IsModified_Storage);
607	mlock.release();
608
609	m->pParent->i_onStorageControllerChange();
610	}
611
612	return S_OK;
613	}
614
615	HRESULT StorageController::getUseHostIOCache(BOOL *fUseHostIOCache)
616	{
617	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
618
619	*fUseHostIOCache = m->bd->fUseHostIOCache;
620
621	return S_OK;
622	}
623
624	HRESULT StorageController::setUseHostIOCache(BOOL fUseHostIOCache)
625	{
626	/* the machine needs to be mutable */
627	AutoMutableStateDependency adep(m->pParent);
628	if (FAILED(adep.rc())) return adep.rc();
629
630	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
631
632	if (m->bd->fUseHostIOCache != !!fUseHostIOCache)
633	{
634	m->bd.backup();
635	m->bd->fUseHostIOCache = !!fUseHostIOCache;
636
637	alock.release();
638	AutoWriteLock mlock(m->pParent COMMA_LOCKVAL_SRC_POS); // m->pParent is const, needs no locking
639	m->pParent->i_setModified(Machine::IsModified_Storage);
640	mlock.release();
641
642	m->pParent->i_onStorageControllerChange();
643	}
644
645	return S_OK;
646	}
647
648	HRESULT StorageController::getBootable(BOOL *fBootable)
649	{
650	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
651
652	*fBootable = m->bd->fBootable;
653
654	return S_OK;
655	}
656
657	// public methods only for internal purposes
658	/////////////////////////////////////////////////////////////////////////////
659
660	const Utf8Str& StorageController::i_getName() const
661	{
662	return m->bd->strName;
663	}
664
665	StorageControllerType_T StorageController::i_getControllerType() const
666	{
667	return m->bd->controllerType;
668	}
669
670	StorageBus_T StorageController::i_getStorageBus() const
671	{
672	return m->bd->storageBus;
673	}
674
675	ULONG StorageController::i_getInstance() const
676	{
677	return m->bd->ulInstance;
678	}
679
680	bool StorageController::i_getBootable() const
681	{
682	return !!m->bd->fBootable;
683	}
684
685	/**
686	* Checks the validity of a port and device number.
687	*
688	* @retval S_OK If the given port and device numbers are within the range
689	* supported by this controller.
690	* @retval E_INVALIDARG If not. Sets an error.
691	* @param aControllerPort Controller port number.
692	* @param aDevice Device number.
693	*/
694	HRESULT StorageController::i_checkPortAndDeviceValid(LONG aControllerPort,
695	LONG aDevice)
696	{
697	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
698
699	ULONG portCount = m->bd->ulPortCount;
700	ULONG devicesPerPort;
701	HRESULT rc = m->pSystemProperties->GetMaxDevicesPerPortForStorageBus(m->bd->storageBus, &devicesPerPort);
702	if (FAILED(rc)) return rc;
703
704	if ( aControllerPort < 0
705	\|\| aControllerPort >= (LONG)portCount
706	\|\| aDevice < 0
707	\|\| aDevice >= (LONG)devicesPerPort
708	)
709	return setError(E_INVALIDARG,
710	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])"),
711	(int)aControllerPort, (int)portCount-1, (int)aDevice, (int)devicesPerPort-1);
712
713	return S_OK;
714	}
715
716	/** @note Locks objects for writing! */
717	void StorageController::i_setBootable(BOOL fBootable)
718	{
719	AutoCaller autoCaller(this);
720	AssertComRCReturnVoid(autoCaller.rc());
721
722	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
723
724	m->bd.backup();
725	m->bd->fBootable = RT_BOOL(fBootable);
726	}
727
728	/** @note Locks objects for writing! */
729	void StorageController::i_rollback()
730	{
731	AutoCaller autoCaller(this);
732	AssertComRCReturnVoid(autoCaller.rc());
733
734	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
735
736	m->bd.rollback();
737	}
738
739	/**
740	* @note Locks this object for writing, together with the peer object (also
741	* for writing) if there is one.
742	*/
743	void StorageController::i_commit()
744	{
745	/* sanity */
746	AutoCaller autoCaller(this);
747	AssertComRCReturnVoid(autoCaller.rc());
748
749	/* sanity too */
750	AutoCaller peerCaller(m->pPeer);
751	AssertComRCReturnVoid(peerCaller.rc());
752
753	/* lock both for writing since we modify both (m->pPeer is "master" so locked
754	* first) */
755	AutoMultiWriteLock2 alock(m->pPeer, this COMMA_LOCKVAL_SRC_POS);
756
757	if (m->bd.isBackedUp())
758	{
759	m->bd.commit();
760	if (m->pPeer)
761	{
762	// attach new data to the peer and reshare it
763	m->pPeer->m->bd.attach(m->bd);
764	}
765	}
766	}
767
768	/**
769	* Cancels sharing (if any) by making an independent copy of data.
770	* This operation also resets this object's peer to NULL.
771	*
772	* @note Locks this object for writing, together with the peer object
773	* represented by @a aThat (locked for reading).
774	*/
775	void StorageController::i_unshare()
776	{
777	/* sanity */
778	AutoCaller autoCaller(this);
779	AssertComRCReturnVoid(autoCaller.rc());
780
781	/* sanity too */
782	AutoCaller peerCaller(m->pPeer);
783	AssertComRCReturnVoid(peerCaller.rc());
784
785	/* peer is not modified, lock it for reading (m->pPeer is "master" so locked
786	* first) */
787	AutoReadLock rl(m->pPeer COMMA_LOCKVAL_SRC_POS);
788	AutoWriteLock wl(this COMMA_LOCKVAL_SRC_POS);
789
790	if (m->bd.isShared())
791	{
792	if (!m->bd.isBackedUp())
793	m->bd.backup();
794
795	m->bd.commit();
796	}
797
798	unconst(m->pPeer) = NULL;
799	}
800
801	Machine* StorageController::i_getMachine()
802	{
803	return m->pParent;
804	}
805
806	ComObjPtr<StorageController> StorageController::i_getPeer()
807	{
808	return m->pPeer;
809	}
810
811	// private methods
812	/////////////////////////////////////////////////////////////////////////////
813
814
815	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/src-server/StorageControllerImpl.cpp@ 72899

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