/* $Id: MediumImpl.cpp 25930 2010-01-20 12:59:47Z vboxsync $ */ /** @file * * VirtualBox COM class implementation */ /* * Copyright (C) 2008-2009 Sun Microsystems, Inc. * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ #include "MediumImpl.h" #include "ProgressImpl.h" #include "SystemPropertiesImpl.h" #include "VirtualBoxImpl.h" #include "AutoCaller.h" #include "Logging.h" #include #include #include #include #include #include #include #include #include #include //////////////////////////////////////////////////////////////////////////////// // // Medium data definition // //////////////////////////////////////////////////////////////////////////////// /** Describes how a machine refers to this image. */ struct BackRef { /** Equality predicate for stdc++. */ struct EqualsTo : public std::unary_function { explicit EqualsTo(const Guid &aMachineId) : machineId(aMachineId) {} bool operator()(const argument_type &aThat) const { return aThat.machineId == machineId; } const Guid machineId; }; typedef std::list GuidList; BackRef(const Guid &aMachineId, const Guid &aSnapshotId = Guid::Empty) : machineId(aMachineId), fInCurState(aSnapshotId.isEmpty()) { if (!aSnapshotId.isEmpty()) llSnapshotIds.push_back(aSnapshotId); } Guid machineId; bool fInCurState : 1; GuidList llSnapshotIds; }; typedef std::list BackRefList; struct Medium::Data { Data() : state(MediumState_NotCreated), size(0), readers(0), preLockState(MediumState_NotCreated), queryInfoSem(NIL_RTSEMEVENTMULTI), queryInfoRunning(false), type(MediumType_Normal), devType(DeviceType_HardDisk), logicalSize(0), hddOpenMode(OpenReadWrite), autoReset(false), setImageId(false), setParentId(false), hostDrive(FALSE), implicit(false), numCreateDiffTasks(0), vdDiskIfaces(NULL) {} /** weak VirtualBox parent */ const ComObjPtr pVirtualBox; const Guid id; Utf8Str strDescription; MediumState_T state; Utf8Str strLocation; Utf8Str strLocationFull; uint64_t size; Utf8Str strLastAccessError; // pParent and llChildren are protected by VirtualBox::getMediaTreeLockHandle() ComObjPtr pParent; MediaList llChildren; // to add a child, just call push_back; to remove a child, call child->deparent() which does a lookup BackRefList backRefs; size_t readers; MediumState_T preLockState; RTSEMEVENTMULTI queryInfoSem; bool queryInfoRunning : 1; const Utf8Str strFormat; ComObjPtr formatObj; MediumType_T type; DeviceType_T devType; uint64_t logicalSize; /*< In MBytes. */ HDDOpenMode hddOpenMode; BOOL autoReset : 1; /** the following members are invalid after changing UUID on open */ BOOL setImageId : 1; BOOL setParentId : 1; const Guid imageId; const Guid parentId; BOOL hostDrive : 1; typedef std::map PropertyMap; PropertyMap properties; bool implicit : 1; uint32_t numCreateDiffTasks; Utf8Str vdError; /*< Error remembered by the VD error callback. */ VDINTERFACE vdIfError; VDINTERFACEERROR vdIfCallsError; VDINTERFACE vdIfConfig; VDINTERFACECONFIG vdIfCallsConfig; VDINTERFACE vdIfTcpNet; VDINTERFACETCPNET vdIfCallsTcpNet; PVDINTERFACE vdDiskIfaces; }; //////////////////////////////////////////////////////////////////////////////// // // Globals // //////////////////////////////////////////////////////////////////////////////// /** * Asynchronous task thread parameter bucket. * * Note that instances of this class must be created using new() because the * task thread function will delete them when the task is complete! * * @note The constructor of this class adds a caller on the managed Medium * object which is automatically released upon destruction. */ struct Medium::Task : public com::SupportErrorInfoBase { enum Operation { CreateBase, CreateDiff, Merge, Clone, Delete, Reset, Compact }; Medium *that; AutoCaller m_autoCaller; ComObjPtr m_pProgress; Operation m_operation; /** Where to save the result when executed using #runNow(). */ HRESULT m_rc; // Whether the caller needs to call VirtualBox::saveSettings() after // the task function returns. Only used in synchronous (wait) mode; // otherwise the task will save the settings itself. bool *m_pfNeedsSaveSettings; Task(Medium *aThat, Progress *aProgress, Operation aOperation) : that(aThat), m_autoCaller(aThat), m_pProgress(aProgress), m_operation(aOperation), m_rc(S_OK), m_pfNeedsSaveSettings(NULL) { } ~Task(); void setData(Medium *aTarget) { d.target = aTarget; HRESULT rc = d.target->addCaller(); AssertComRC(rc); } void setData(Medium *aTarget, Medium *aParent) { d.target = aTarget; HRESULT rc = d.target->addCaller(); AssertComRC(rc); d.parentDisk = aParent; if (aParent) { rc = d.parentDisk->addCaller(); AssertComRC(rc); } } void setData(MergeChain *aChain) { AssertReturnVoid(aChain != NULL); d.chain.reset(aChain); } void setData(ImageChain *aSrcChain, ImageChain *aParentChain) { AssertReturnVoid(aSrcChain != NULL); AssertReturnVoid(aParentChain != NULL); d.source.reset(aSrcChain); d.parent.reset(aParentChain); } void setData(ImageChain *aImgChain) { AssertReturnVoid(aImgChain != NULL); d.images.reset(aImgChain); } HRESULT startThread(); HRESULT runNow(bool *pfNeedsSaveSettings); struct Data { Data() : size(0) {} /* CreateBase */ uint64_t size; /* CreateBase, CreateDiff, Clone */ MediumVariant_T variant; /* CreateDiff, Clone */ ComObjPtr target; /* Clone */ /** Media to open, in {parent,child} order */ std::auto_ptr source; /** Media which are parent of target, in {parent,child} order */ std::auto_ptr parent; /** The to-be parent medium object */ ComObjPtr parentDisk; /* Merge */ /** Media to merge, in {parent,child} order */ std::auto_ptr chain; /* Compact */ /** Media to open, in {parent,child} order */ std::auto_ptr images; } d; protected: // SupportErrorInfoBase interface const GUID &mainInterfaceID() const { return COM_IIDOF(IMedium); } const char *componentName() const { return Medium::ComponentName(); } }; Medium::Task::~Task() { /* remove callers added by setData() */ if (!d.target.isNull()) d.target->releaseCaller(); } /** * Starts a new thread driven by the Medium::taskThread() function and passes * this Task instance as an argument. * * Note that if this method returns success, this Task object becomes an ownee * of the started thread and will be automatically deleted when the thread * terminates. * * @note When the task is executed by this method, IProgress::notifyComplete() * is automatically called for the progress object associated with this * task when the task is finished to signal the operation completion for * other threads asynchronously waiting for it. */ HRESULT Medium::Task::startThread() { int vrc = RTThreadCreate(NULL, Medium::taskThread, this, 0, RTTHREADTYPE_MAIN_HEAVY_WORKER, 0, "Medium::Task"); ComAssertMsgRCRet(vrc, ("Could not create Medium::Task thread (%Rrc)\n", vrc), E_FAIL); return S_OK; } /** * Runs Medium::taskThread() by passing it this Task instance as an argument * on the current thread instead of creating a new one. * * This call implies that it is made on another temporary thread created for * some asynchronous task. Avoid calling it from a normal thread since the task * operatinos are potentially lengthy and will block the calling thread in this * case. * * Note that this Task object will be deleted by taskThread() when this method * returns! * * @note When the task is executed by this method, IProgress::notifyComplete() * is not called for the progress object associated with this task when * the task is finished. Instead, the result of the operation is returned * by this method directly and it's the caller's responsibility to * complete the progress object in this case. */ HRESULT Medium::Task::runNow(bool *pfNeedsSaveSettings) { m_pfNeedsSaveSettings = pfNeedsSaveSettings; /* NIL_RTTHREAD indicates synchronous call. */ Medium::taskThread(NIL_RTTHREAD, this); return m_rc; } //////////////////////////////////////////////////////////////////////////////// // // Merge chain class // //////////////////////////////////////////////////////////////////////////////// /** * Helper class for merge operations. * * @note It is assumed that when modifying methods of this class are called, * Medium::getTreeLock() is held in read mode. */ class Medium::MergeChain : public MediaList, public com::SupportErrorInfoBase { public: MergeChain(bool aForward, bool aIgnoreAttachments) : mForward(aForward) , mIgnoreAttachments(aIgnoreAttachments) {} ~MergeChain() { for (iterator it = mChildren.begin(); it != mChildren.end(); ++ it) { HRESULT rc = (*it)->UnlockWrite(NULL); AssertComRC(rc); (*it)->releaseCaller(); } for (iterator it = begin(); it != end(); ++ it) { AutoWriteLock alock(*it COMMA_LOCKVAL_SRC_POS); Assert((*it)->m->state == MediumState_LockedWrite || (*it)->m->state == MediumState_Deleting); if ((*it)->m->state == MediumState_LockedWrite) (*it)->UnlockWrite(NULL); else (*it)->m->state = MediumState_Created; (*it)->releaseCaller(); } if (!mParent.isNull()) mParent->releaseCaller(); } HRESULT addSource(Medium *aMedium) { HRESULT rc = aMedium->addCaller(); if (FAILED(rc)) return rc; AutoWriteLock alock(aMedium COMMA_LOCKVAL_SRC_POS); if (mForward) { rc = checkChildrenAndAttachmentsAndImmutable(aMedium); if (FAILED(rc)) { aMedium->releaseCaller(); return rc; } } /* We have to fetch the state with the COM method, cause it's possible that the medium isn't fully initialized yet. */ MediumState_T m; rc = aMedium->RefreshState(&m); if (FAILED(rc)) return rc; /* go to Deleting */ switch (m) { case MediumState_Created: aMedium->m->state = MediumState_Deleting; break; default: aMedium->releaseCaller(); return aMedium->setStateError(); } push_front(aMedium); if (mForward) { /* we will need parent to reparent target */ if (!aMedium->m->pParent.isNull()) { rc = aMedium->m->pParent->addCaller(); if (FAILED(rc)) return rc; mParent = aMedium->m->pParent; } } else { /* we will need to reparent children */ for (MediaList::const_iterator it = aMedium->getChildren().begin(); it != aMedium->getChildren().end(); ++it) { ComObjPtr pMedium = *it; rc = pMedium->addCaller(); if (FAILED(rc)) return rc; rc = pMedium->LockWrite(NULL); if (FAILED(rc)) { pMedium->releaseCaller(); return rc; } mChildren.push_back(pMedium); } } return S_OK; } HRESULT addTarget(Medium *aMedium) { HRESULT rc = aMedium->addCaller(); if (FAILED(rc)) return rc; AutoWriteLock alock(aMedium COMMA_LOCKVAL_SRC_POS); if (!mForward) { rc = checkChildrenAndImmutable(aMedium); if (FAILED(rc)) { aMedium->releaseCaller(); return rc; } } /* go to LockedWrite */ rc = aMedium->LockWrite(NULL); if (FAILED(rc)) { aMedium->releaseCaller(); return rc; } push_front(aMedium); return S_OK; } HRESULT addIntermediate(Medium *aMedium) { HRESULT rc = aMedium->addCaller(); if (FAILED(rc)) return rc; AutoWriteLock alock(aMedium COMMA_LOCKVAL_SRC_POS); rc = checkChildrenAndAttachments(aMedium); if (FAILED(rc)) { aMedium->releaseCaller(); return rc; } /* go to Deleting */ switch (aMedium->m->state) { case MediumState_Created: aMedium->m->state = MediumState_Deleting; break; default: aMedium->releaseCaller(); return aMedium->setStateError(); } push_front(aMedium); return S_OK; } bool isForward() const { return mForward; } Medium *parent() const { return mParent; } const MediaList& children() const { return mChildren; } Medium *source() const { AssertReturn(size() > 0, NULL); return mForward ? front() : back(); } Medium *target() const { AssertReturn(size() > 0, NULL); return mForward ? back() : front(); } protected: // SupportErrorInfoBase interface const GUID &mainInterfaceID() const { return COM_IIDOF(IMedium); } const char *componentName() const { return Medium::ComponentName(); } private: HRESULT check(Medium *aMedium, bool aChildren, bool aAttachments, bool aImmutable) { if (aChildren) { /* not going to multi-merge as it's too expensive */ if (aMedium->getChildren().size() > 1) { return setError(E_FAIL, tr("Medium '%s' involved in the merge operation has more than one child medium (%d)"), aMedium->m->strLocationFull.raw(), aMedium->getChildren().size()); } } if (aAttachments && !mIgnoreAttachments) { if (aMedium->m->backRefs.size() != 0) return setError(E_FAIL, tr("Medium '%s' is attached to %d virtual machines"), aMedium->m->strLocationFull.raw(), aMedium->m->backRefs.size()); } if (aImmutable) { if (aMedium->m->type == MediumType_Immutable) return setError(E_FAIL, tr("Medium '%s' is immutable"), aMedium->m->strLocationFull.raw()); } return S_OK; } HRESULT checkChildren(Medium *aMedium) { return check(aMedium, true, false, false); } HRESULT checkChildrenAndImmutable(Medium *aMedium) { return check(aMedium, true, false, true); } HRESULT checkChildrenAndAttachments(Medium *aMedium) { return check(aMedium, true, true, false); } HRESULT checkChildrenAndAttachmentsAndImmutable(Medium *aMedium) { return check(aMedium, true, true, true); } /** true if forward merge, false if backward */ bool mForward : 1; /** true to not perform attachment checks */ bool mIgnoreAttachments : 1; /** Parent of the source when forward merge (if any) */ ComObjPtr mParent; /** Children of the source when backward merge (if any) */ MediaList mChildren; }; //////////////////////////////////////////////////////////////////////////////// // // ImageChain class // //////////////////////////////////////////////////////////////////////////////// /** * Helper class for image operations involving the entire parent chain. * * @note It is assumed that when modifying methods of this class are called, * Medium::getTreeLock() is held in read mode. */ class Medium::ImageChain : public MediaList, public com::SupportErrorInfoBase { public: ImageChain() {} ~ImageChain() { /* empty? */ if (begin() != end()) { MediaList::const_iterator last = end(); last--; for (MediaList::const_iterator it = begin(); it != end(); ++ it) { AutoWriteLock alock(*it COMMA_LOCKVAL_SRC_POS); if (it == last) { Assert( (*it)->m->state == MediumState_LockedRead || (*it)->m->state == MediumState_LockedWrite); if ((*it)->m->state == MediumState_LockedRead) (*it)->UnlockRead(NULL); else if ((*it)->m->state == MediumState_LockedWrite) (*it)->UnlockWrite(NULL); } else { Assert((*it)->m->state == MediumState_LockedRead); if ((*it)->m->state == MediumState_LockedRead) (*it)->UnlockRead(NULL); } (*it)->releaseCaller(); } } } HRESULT addImage(Medium *aMedium) { HRESULT rc = aMedium->addCaller(); if (FAILED(rc)) return rc; push_front(aMedium); return S_OK; } HRESULT lockImagesRead() { /* Lock all disks in the chain in {parent, child} order, * and make sure they are accessible. */ /// @todo code duplication with SessionMachine::lockMedia, see below ErrorInfoKeeper eik(true /* aIsNull */); MultiResult mrc(S_OK); for (MediaList::const_iterator it = begin(); it != end(); ++ it) { HRESULT rc = S_OK; MediumState_T mediumState = (*it)->getState(); /* accessibility check must be first, otherwise locking * interferes with getting the medium state. */ if (mediumState == MediumState_Inaccessible) { rc = (*it)->RefreshState(&mediumState); if (FAILED(rc)) return rc; if (mediumState == MediumState_Inaccessible) { Bstr error; rc = (*it)->COMGETTER(LastAccessError)(error.asOutParam()); if (FAILED(rc)) return rc; Bstr loc; rc = (*it)->COMGETTER(Location)(loc.asOutParam()); if (FAILED(rc)) return rc; /* collect multiple errors */ eik.restore(); /* be in sync with Medium::setStateError() */ Assert(!error.isEmpty()); mrc = setError(E_FAIL, tr("Medium '%ls' is not accessible. %ls"), loc.raw(), error.raw()); eik.fetch(); } } rc = (*it)->LockRead(&mediumState); if (FAILED(rc)) return rc; } eik.restore(); HRESULT rc2 = (HRESULT)mrc; if (FAILED(rc2)) return rc2; return S_OK; } HRESULT lockImagesReadAndLastWrite() { /* Lock all disks in the chain in {parent, child} order, * and make sure they are accessible. */ /// @todo code duplication with SessionMachine::lockMedia, see below ErrorInfoKeeper eik(true /* aIsNull */); MultiResult mrc(S_OK); MediaList::const_iterator last = end(); last--; for (MediaList::const_iterator it = begin(); it != end(); ++ it) { HRESULT rc = S_OK; MediumState_T mediumState = (*it)->getState(); /* accessibility check must be first, otherwise locking * interferes with getting the medium state. */ if (mediumState == MediumState_Inaccessible) { rc = (*it)->RefreshState(&mediumState); if (FAILED(rc)) return rc; if (mediumState == MediumState_Inaccessible) { Bstr error; rc = (*it)->COMGETTER(LastAccessError)(error.asOutParam()); if (FAILED(rc)) return rc; Bstr loc; rc = (*it)->COMGETTER(Location)(loc.asOutParam()); if (FAILED(rc)) return rc; /* collect multiple errors */ eik.restore(); /* be in sync with Medium::setStateError() */ Assert(!error.isEmpty()); mrc = setError(E_FAIL, tr("Medium '%ls' is not accessible. %ls"), loc.raw(), error.raw()); eik.fetch(); } } if (it == last) rc = (*it)->LockWrite(&mediumState); else rc = (*it)->LockRead(&mediumState); } eik.restore(); HRESULT rc2 = (HRESULT)mrc; if (FAILED(rc2)) return rc2; return S_OK; } protected: // SupportErrorInfoBase interface const GUID &mainInterfaceID() const { return COM_IIDOF(IMedium); } const char *componentName() const { return Medium::ComponentName(); } private: }; //////////////////////////////////////////////////////////////////////////////// // // Medium constructor / destructor // //////////////////////////////////////////////////////////////////////////////// DEFINE_EMPTY_CTOR_DTOR(Medium) HRESULT Medium::FinalConstruct() { m = new Data; /* Initialize the callbacks of the VD error interface */ m->vdIfCallsError.cbSize = sizeof(VDINTERFACEERROR); m->vdIfCallsError.enmInterface = VDINTERFACETYPE_ERROR; m->vdIfCallsError.pfnError = vdErrorCall; m->vdIfCallsError.pfnMessage = NULL; /* Initialize the callbacks of the VD config interface */ m->vdIfCallsConfig.cbSize = sizeof(VDINTERFACECONFIG); m->vdIfCallsConfig.enmInterface = VDINTERFACETYPE_CONFIG; m->vdIfCallsConfig.pfnAreKeysValid = vdConfigAreKeysValid; m->vdIfCallsConfig.pfnQuerySize = vdConfigQuerySize; m->vdIfCallsConfig.pfnQuery = vdConfigQuery; /* Initialize the callbacks of the VD TCP interface (we always use the host * IP stack for now) */ m->vdIfCallsTcpNet.cbSize = sizeof(VDINTERFACETCPNET); m->vdIfCallsTcpNet.enmInterface = VDINTERFACETYPE_TCPNET; m->vdIfCallsTcpNet.pfnClientConnect = RTTcpClientConnect; m->vdIfCallsTcpNet.pfnClientClose = RTTcpClientClose; m->vdIfCallsTcpNet.pfnSelectOne = RTTcpSelectOne; m->vdIfCallsTcpNet.pfnRead = RTTcpRead; m->vdIfCallsTcpNet.pfnWrite = RTTcpWrite; m->vdIfCallsTcpNet.pfnFlush = RTTcpFlush; /* Initialize the per-disk interface chain */ int vrc; vrc = VDInterfaceAdd(&m->vdIfError, "Medium::vdInterfaceError", VDINTERFACETYPE_ERROR, &m->vdIfCallsError, this, &m->vdDiskIfaces); AssertRCReturn(vrc, E_FAIL); vrc = VDInterfaceAdd(&m->vdIfConfig, "Medium::vdInterfaceConfig", VDINTERFACETYPE_CONFIG, &m->vdIfCallsConfig, this, &m->vdDiskIfaces); AssertRCReturn(vrc, E_FAIL); vrc = VDInterfaceAdd(&m->vdIfTcpNet, "Medium::vdInterfaceTcpNet", VDINTERFACETYPE_TCPNET, &m->vdIfCallsTcpNet, this, &m->vdDiskIfaces); AssertRCReturn(vrc, E_FAIL); vrc = RTSemEventMultiCreate(&m->queryInfoSem); AssertRCReturn(vrc, E_FAIL); vrc = RTSemEventMultiSignal(m->queryInfoSem); AssertRCReturn(vrc, E_FAIL); return S_OK; } void Medium::FinalRelease() { uninit(); delete m; } /** * Initializes the hard disk object without creating or opening an associated * storage unit. * * For hard disks that don't have the VD_CAP_CREATE_FIXED or * VD_CAP_CREATE_DYNAMIC capability (and therefore cannot be created or deleted * with the means of VirtualBox) the associated storage unit is assumed to be * ready for use so the state of the hard disk object will be set to Created. * * @param aVirtualBox VirtualBox object. * @param aLocation Storage unit location. * @param pfNeedsSaveSettings Optional pointer to a bool that must have been initialized to false and that will be set to true * by this function if the caller should invoke VirtualBox::saveSettings() because the global settings have changed. */ HRESULT Medium::init(VirtualBox *aVirtualBox, CBSTR aFormat, CBSTR aLocation, bool *pfNeedsSaveSettings) { AssertReturn(aVirtualBox != NULL, E_FAIL); AssertReturn(aFormat != NULL && *aFormat != '\0', E_FAIL); /* Enclose the state transition NotReady->InInit->Ready */ AutoInitSpan autoInitSpan(this); AssertReturn(autoInitSpan.isOk(), E_FAIL); HRESULT rc = S_OK; /* share VirtualBox weakly (parent remains NULL so far) */ unconst(m->pVirtualBox) = aVirtualBox; /* no storage yet */ m->state = MediumState_NotCreated; /* cannot be a host drive */ m->hostDrive = FALSE; /* No storage unit is created yet, no need to queryInfo() */ rc = setFormat(aFormat); if (FAILED(rc)) return rc; if (m->formatObj->capabilities() & MediumFormatCapabilities_File) { rc = setLocation(aLocation); if (FAILED(rc)) return rc; } else { rc = setLocation(aLocation); if (FAILED(rc)) return rc; } if (!(m->formatObj->capabilities() & ( MediumFormatCapabilities_CreateFixed | MediumFormatCapabilities_CreateDynamic)) ) { /* storage for hard disks of this format can neither be explicitly * created by VirtualBox nor deleted, so we place the hard disk to * Created state here and also add it to the registry */ m->state = MediumState_Created; unconst(m->id).create(); AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); rc = m->pVirtualBox->registerHardDisk(this, pfNeedsSaveSettings); } /* Confirm a successful initialization when it's the case */ if (SUCCEEDED(rc)) autoInitSpan.setSucceeded(); return rc; } /** * Initializes the medium object by opening the storage unit at the specified * location. The enOpenMode parameter defines whether the image will be opened * read/write or read-only. * * Note that the UUID, format and the parent of this medium will be * determined when reading the medium storage unit, unless new values are * specified by the parameters. If the detected or set parent is * not known to VirtualBox, then this method will fail. * * @param aVirtualBox VirtualBox object. * @param aLocation Storage unit location. * @param enOpenMode Whether to open the image read/write or read-only. * @param aDeviceType Device type of medium. * @param aSetImageId Whether to set the image UUID or not. * @param aImageId New image UUID if @aSetId is true. Empty string means * create a new UUID, and a zero UUID is invalid. * @param aSetParentId Whether to set the parent UUID or not. * @param aParentId New parent UUID if @aSetParentId is true. Empty string * means create a new UUID, and a zero UUID is valid. */ HRESULT Medium::init(VirtualBox *aVirtualBox, CBSTR aLocation, HDDOpenMode enOpenMode, DeviceType_T aDeviceType, BOOL aSetImageId, const Guid &aImageId, BOOL aSetParentId, const Guid &aParentId) { AssertReturn(aVirtualBox, E_INVALIDARG); AssertReturn(aLocation, E_INVALIDARG); /* Enclose the state transition NotReady->InInit->Ready */ AutoInitSpan autoInitSpan(this); AssertReturn(autoInitSpan.isOk(), E_FAIL); HRESULT rc = S_OK; /* share VirtualBox weakly (parent remains NULL so far) */ unconst(m->pVirtualBox) = aVirtualBox; /* there must be a storage unit */ m->state = MediumState_Created; /* remember device type for correct unregistering later */ m->devType = aDeviceType; /* cannot be a host drive */ m->hostDrive = FALSE; /* remember the open mode (defaults to ReadWrite) */ m->hddOpenMode = enOpenMode; if (aDeviceType == DeviceType_HardDisk) rc = setLocation(aLocation); else rc = setLocation(aLocation, "RAW"); if (FAILED(rc)) return rc; /* save the new uuid values, will be used by queryInfo() */ m->setImageId = aSetImageId; unconst(m->imageId) = aImageId; m->setParentId = aSetParentId; unconst(m->parentId) = aParentId; /* get all the information about the medium from the storage unit */ rc = queryInfo(); if (SUCCEEDED(rc)) { /* if the storage unit is not accessible, it's not acceptable for the * newly opened media so convert this into an error */ if (m->state == MediumState_Inaccessible) { Assert(!m->strLastAccessError.isEmpty()); rc = setError(E_FAIL, m->strLastAccessError); } else { AssertReturn(!m->id.isEmpty(), E_FAIL); /* storage format must be detected by queryInfo() if the medium is accessible */ AssertReturn(!m->strFormat.isEmpty(), E_FAIL); } } /* Confirm a successful initialization when it's the case */ if (SUCCEEDED(rc)) autoInitSpan.setSucceeded(); return rc; } /** * Initializes the medium object by loading its data from the given settings * node. In this mode, the image will always be opened read/write. * * @param aVirtualBox VirtualBox object. * @param aParent Parent medium disk or NULL for a root (base) medium. * @param aDeviceType Device type of the medium. * @param aNode Configuration settings. * * @note Locks VirtualBox lock for writing, getTreeLock() for writing. */ HRESULT Medium::init(VirtualBox *aVirtualBox, Medium *aParent, DeviceType_T aDeviceType, const settings::Medium &data) { using namespace settings; AssertReturn(aVirtualBox, E_INVALIDARG); /* Enclose the state transition NotReady->InInit->Ready */ AutoInitSpan autoInitSpan(this); AssertReturn(autoInitSpan.isOk(), E_FAIL); HRESULT rc = S_OK; /* share VirtualBox and parent weakly */ unconst(m->pVirtualBox) = aVirtualBox; /* register with VirtualBox/parent early, since uninit() will * unconditionally unregister on failure */ if (aParent) { // differencing image: add to parent AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); m->pParent = aParent; aParent->m->llChildren.push_back(this); } /* see below why we don't call queryInfo() (and therefore treat the medium * as inaccessible for now */ m->state = MediumState_Inaccessible; m->strLastAccessError = tr("Accessibility check was not yet performed"); /* required */ unconst(m->id) = data.uuid; /* assume not a host drive */ m->hostDrive = FALSE; /* optional */ m->strDescription = data.strDescription; /* required */ if (aDeviceType == DeviceType_HardDisk) { AssertReturn(!data.strFormat.isEmpty(), E_FAIL); rc = setFormat(Bstr(data.strFormat)); if (FAILED(rc)) return rc; } else { /// @todo handle host drive settings here as well? if (!data.strFormat.isEmpty()) rc = setFormat(Bstr(data.strFormat)); else rc = setFormat(Bstr("RAW")); if (FAILED(rc)) return rc; } /* optional, only for diffs, default is false; * we can only auto-reset diff images, so they * must not have a parent */ if (aParent != NULL) m->autoReset = data.fAutoReset; else m->autoReset = false; /* properties (after setting the format as it populates the map). Note that * if some properties are not supported but preseint in the settings file, * they will still be read and accessible (for possible backward * compatibility; we can also clean them up from the XML upon next * XML format version change if we wish) */ for (settings::PropertiesMap::const_iterator it = data.properties.begin(); it != data.properties.end(); ++ it) { const Utf8Str &name = it->first; const Utf8Str &value = it->second; m->properties[Bstr(name)] = Bstr(value); } /* required */ rc = setLocation(data.strLocation); if (FAILED(rc)) return rc; if (aDeviceType == DeviceType_HardDisk) { /* type is only for base hard disks */ if (m->pParent.isNull()) m->type = data.hdType; } else m->type = MediumType_Writethrough; /* remember device type for correct unregistering later */ m->devType = aDeviceType; LogFlowThisFunc(("m->locationFull='%s', m->format=%s, m->id={%RTuuid}\n", m->strLocationFull.raw(), m->strFormat.raw(), m->id.raw())); /* Don't call queryInfo() for registered media to prevent the calling * thread (i.e. the VirtualBox server startup thread) from an unexpected * freeze but mark it as initially inaccessible instead. The vital UUID, * location and format properties are read from the registry file above; to * get the actual state and the rest of the data, the user will have to call * COMGETTER(State). */ AutoWriteLock treeLock(aVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); /* load all children */ for (settings::MediaList::const_iterator it = data.llChildren.begin(); it != data.llChildren.end(); ++it) { const settings::Medium &med = *it; ComObjPtr pHD; pHD.createObject(); rc = pHD->init(aVirtualBox, this, // parent aDeviceType, med); // child data if (FAILED(rc)) break; rc = m->pVirtualBox->registerHardDisk(pHD, false /* aSaveRegistry */); if (FAILED(rc)) break; } /* Confirm a successful initialization when it's the case */ if (SUCCEEDED(rc)) autoInitSpan.setSucceeded(); return rc; } /** * Initializes the medium object by providing the host drive information. * Not used for anything but the host floppy/host DVD case. * * @todo optimize all callers to avoid reconstructing objects with the same * information over and over again - in the typical case each VM referring to * a particular host drive has its own instance. * * @param aVirtualBox VirtualBox object. * @param aDeviceType Device type of the medium. * @param aLocation Location of the host drive. * @param aDescription Comment for this host drive. * * @note Locks VirtualBox lock for writing, getTreeLock() for writing. */ HRESULT Medium::init(VirtualBox *aVirtualBox, DeviceType_T aDeviceType, CBSTR aLocation, CBSTR aDescription) { ComAssertRet(aDeviceType == DeviceType_DVD || aDeviceType == DeviceType_Floppy, E_INVALIDARG); ComAssertRet(aLocation, E_INVALIDARG); /* Enclose the state transition NotReady->InInit->Ready */ AutoInitSpan autoInitSpan(this); AssertReturn(autoInitSpan.isOk(), E_FAIL); /* share VirtualBox weakly (parent remains NULL so far) */ unconst(m->pVirtualBox) = aVirtualBox; /* fake up a UUID which is unique, but also reproducible */ RTUUID uuid; RTUuidClear(&uuid); if (aDeviceType == DeviceType_DVD) memcpy(&uuid.au8[0], "DVD", 3); else memcpy(&uuid.au8[0], "FD", 2); /* use device name, adjusted to the end of uuid, shortened if necessary */ Utf8Str loc(aLocation); size_t cbLocation = strlen(loc.raw()); if (cbLocation > 12) memcpy(&uuid.au8[4], loc.raw() + (cbLocation - 12), 12); else memcpy(&uuid.au8[4 + 12 - cbLocation], loc.raw(), cbLocation); unconst(m->id) = uuid; m->type = MediumType_Writethrough; m->devType = aDeviceType; m->state = MediumState_Created; m->hostDrive = true; HRESULT rc = setFormat(Bstr("RAW")); if (FAILED(rc)) return rc; rc = setLocation(aLocation); if (FAILED(rc)) return rc; m->strDescription = aDescription; /// @todo generate uuid (similarly to host network interface uuid) from location and device type autoInitSpan.setSucceeded(); return S_OK; } /** * Uninitializes the instance. * * Called either from FinalRelease() or by the parent when it gets destroyed. * * @note All children of this hard disk get uninitialized by calling their * uninit() methods. * * @note Caller must hold the tree lock of the medium tree this medium is on. */ void Medium::uninit() { /* Enclose the state transition Ready->InUninit->NotReady */ AutoUninitSpan autoUninitSpan(this); if (autoUninitSpan.uninitDone()) return; if (!m->formatObj.isNull()) { /* remove the caller reference we added in setFormat() */ m->formatObj->releaseCaller(); m->formatObj.setNull(); } if (m->state == MediumState_Deleting) { /* we are being uninitialized after've been deleted by merge. * Reparenting has already been done so don't touch it here (we are * now orphans and remoeDependentChild() will assert) */ Assert(m->pParent.isNull()); } else { MediaList::iterator it; for (it = m->llChildren.begin(); it != m->llChildren.end(); ++it) { Medium *pChild = *it; pChild->m->pParent.setNull(); pChild->uninit(); } m->llChildren.clear(); // this unsets all the ComPtrs and probably calls delete if (m->pParent) { // this is a differencing disk: then remove it from the parent's children list deparent(); } } RTSemEventMultiSignal(m->queryInfoSem); RTSemEventMultiDestroy(m->queryInfoSem); m->queryInfoSem = NIL_RTSEMEVENTMULTI; unconst(m->pVirtualBox).setNull(); } /** * Internal helper that removes "this" from the list of children of its * parent. Used in uninit() and other places when reparenting is necessary. * * The caller must hold the hard disk tree lock! */ void Medium::deparent() { MediaList &llParent = m->pParent->m->llChildren; for (MediaList::iterator it = llParent.begin(); it != llParent.end(); ++it) { Medium *pParentsChild = *it; if (this == pParentsChild) { llParent.erase(it); break; } } m->pParent.setNull(); } //////////////////////////////////////////////////////////////////////////////// // // IMedium public methods // //////////////////////////////////////////////////////////////////////////////// STDMETHODIMP Medium::COMGETTER(Id)(BSTR *aId) { CheckComArgOutPointerValid(aId); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); m->id.toUtf16().cloneTo(aId); return S_OK; } STDMETHODIMP Medium::COMGETTER(Description)(BSTR *aDescription) { CheckComArgOutPointerValid(aDescription); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); if (m->strDescription.isEmpty()) Bstr("").cloneTo(aDescription); else m->strDescription.cloneTo(aDescription); return S_OK; } STDMETHODIMP Medium::COMSETTER(Description)(IN_BSTR aDescription) { CheckComArgNotNull(aDescription); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /// @todo update m->description and save the global registry (and local /// registries of portable VMs referring to this medium), this will also /// require to add the mRegistered flag to data ReturnComNotImplemented(); } STDMETHODIMP Medium::COMGETTER(State)(MediumState_T *aState) { CheckComArgOutPointerValid(aState); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); *aState = m->state; return S_OK; } STDMETHODIMP Medium::COMGETTER(Location)(BSTR *aLocation) { CheckComArgOutPointerValid(aLocation); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); m->strLocationFull.cloneTo(aLocation); return S_OK; } STDMETHODIMP Medium::COMSETTER(Location)(IN_BSTR aLocation) { CheckComArgNotNull(aLocation); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /// @todo NEWMEDIA for file names, add the default extension if no extension /// is present (using the information from the VD backend which also implies /// that one more parameter should be passed to setLocation() requesting /// that functionality since it is only allwed when called from this method /// @todo NEWMEDIA rename the file and set m->location on success, then save /// the global registry (and local registries of portable VMs referring to /// this medium), this will also require to add the mRegistered flag to data ReturnComNotImplemented(); } STDMETHODIMP Medium::COMGETTER(Name)(BSTR *aName) { CheckComArgOutPointerValid(aName); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); getName().cloneTo(aName); return S_OK; } STDMETHODIMP Medium::COMGETTER(DeviceType)(DeviceType_T *aDeviceType) { CheckComArgOutPointerValid(aDeviceType); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); *aDeviceType = m->devType; return S_OK; } STDMETHODIMP Medium::COMGETTER(HostDrive)(BOOL *aHostDrive) { CheckComArgOutPointerValid(aHostDrive); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); *aHostDrive = m->hostDrive; return S_OK; } STDMETHODIMP Medium::COMGETTER(Size)(ULONG64 *aSize) { CheckComArgOutPointerValid(aSize); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); *aSize = m->size; return S_OK; } STDMETHODIMP Medium::COMGETTER(Format)(BSTR *aFormat) { if (aFormat == NULL) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* no need to lock, m->format is const */ m->strFormat.cloneTo(aFormat); return S_OK; } STDMETHODIMP Medium::COMGETTER(Type)(MediumType_T *aType) { if (aType == NULL) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); *aType = m->type; return S_OK; } STDMETHODIMP Medium::COMSETTER(Type)(MediumType_T aType) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* VirtualBox::saveSettings() needs a write lock */ AutoMultiWriteLock2 alock(m->pVirtualBox, this COMMA_LOCKVAL_SRC_POS); switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: break; default: return setStateError(); } if (m->type == aType) { /* Nothing to do */ return S_OK; } /* we access mParent & children() */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); /* cannot change the type of a differencing hard disk */ if (m->pParent) return setError(E_FAIL, tr("Cannot change the type of hard disk '%s' because it is a differencing hard disk"), m->strLocationFull.raw()); /* cannot change the type of a hard disk being in use */ if (m->backRefs.size() != 0) return setError(E_FAIL, tr("Cannot change the type of hard disk '%s' because it is attached to %d virtual machines"), m->strLocationFull.raw(), m->backRefs.size()); switch (aType) { case MediumType_Normal: case MediumType_Immutable: { /* normal can be easily converted to immutable and vice versa even * if they have children as long as they are not attached to any * machine themselves */ break; } case MediumType_Writethrough: { /* cannot change to writethrough if there are children */ if (getChildren().size() != 0) return setError(E_FAIL, tr("Cannot change type for hard disk '%s' since it has %d child hard disk(s)"), m->strLocationFull.raw(), getChildren().size()); break; } default: AssertFailedReturn(E_FAIL); } m->type = aType; HRESULT rc = m->pVirtualBox->saveSettings(); return rc; } STDMETHODIMP Medium::COMGETTER(Parent)(IMedium **aParent) { if (aParent == NULL) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* we access mParent */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); m->pParent.queryInterfaceTo(aParent); return S_OK; } STDMETHODIMP Medium::COMGETTER(Children)(ComSafeArrayOut(IMedium *, aChildren)) { if (ComSafeArrayOutIsNull(aChildren)) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* we access children */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); SafeIfaceArray children(this->getChildren()); children.detachTo(ComSafeArrayOutArg(aChildren)); return S_OK; } STDMETHODIMP Medium::COMGETTER(Base)(IMedium **aBase) { if (aBase == NULL) return E_POINTER; /* base() will do callers/locking */ getBase().queryInterfaceTo(aBase); return S_OK; } STDMETHODIMP Medium::COMGETTER(ReadOnly)(BOOL *aReadOnly) { if (aReadOnly == NULL) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* isRadOnly() will do locking */ *aReadOnly = isReadOnly(); return S_OK; } STDMETHODIMP Medium::COMGETTER(LogicalSize)(ULONG64 *aLogicalSize) { CheckComArgOutPointerValid(aLogicalSize); { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* we access mParent */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); if (m->pParent.isNull()) { *aLogicalSize = m->logicalSize; return S_OK; } } /* We assume that some backend may decide to return a meaningless value in * response to VDGetSize() for differencing hard disks and therefore * always ask the base hard disk ourselves. */ /* base() will do callers/locking */ return getBase()->COMGETTER(LogicalSize)(aLogicalSize); } STDMETHODIMP Medium::COMGETTER(AutoReset)(BOOL *aAutoReset) { CheckComArgOutPointerValid(aAutoReset); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); if (m->pParent) *aAutoReset = FALSE; *aAutoReset = m->autoReset; return S_OK; } STDMETHODIMP Medium::COMSETTER(AutoReset)(BOOL aAutoReset) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* VirtualBox::saveSettings() needs a write lock */ AutoMultiWriteLock2 alock(m->pVirtualBox, this COMMA_LOCKVAL_SRC_POS); if (m->pParent.isNull()) return setError(VBOX_E_NOT_SUPPORTED, tr("Hard disk '%s' is not differencing"), m->strLocationFull.raw()); if (m->autoReset != aAutoReset) { m->autoReset = aAutoReset; return m->pVirtualBox->saveSettings(); } return S_OK; } STDMETHODIMP Medium::COMGETTER(LastAccessError)(BSTR *aLastAccessError) { CheckComArgOutPointerValid(aLastAccessError); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); if (m->strLastAccessError.isEmpty()) Bstr("").cloneTo(aLastAccessError); else m->strLastAccessError.cloneTo(aLastAccessError); return S_OK; } STDMETHODIMP Medium::COMGETTER(MachineIds)(ComSafeArrayOut(BSTR,aMachineIds)) { if (ComSafeGUIDArrayOutIsNull(aMachineIds)) return E_POINTER; AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); com::SafeArray machineIds; if (m->backRefs.size() != 0) { machineIds.reset(m->backRefs.size()); size_t i = 0; for (BackRefList::const_iterator it = m->backRefs.begin(); it != m->backRefs.end(); ++ it, ++ i) { it->machineId.toUtf16().detachTo(&machineIds [i]); } } machineIds.detachTo(ComSafeArrayOutArg(aMachineIds)); return S_OK; } STDMETHODIMP Medium::RefreshState(MediumState_T *aState) { CheckComArgOutPointerValid(aState); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* queryInfo() locks this for writing. */ AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); HRESULT rc = S_OK; switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: case MediumState_LockedRead: { rc = queryInfo(); break; } default: break; } *aState = m->state; return rc; } STDMETHODIMP Medium::GetSnapshotIds(IN_BSTR aMachineId, ComSafeArrayOut(BSTR, aSnapshotIds)) { CheckComArgExpr(aMachineId, Guid(aMachineId).isEmpty() == false); CheckComArgOutSafeArrayPointerValid(aSnapshotIds); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); com::SafeArray snapshotIds; Guid id(aMachineId); for (BackRefList::const_iterator it = m->backRefs.begin(); it != m->backRefs.end(); ++ it) { if (it->machineId == id) { size_t size = it->llSnapshotIds.size(); /* if the medium is attached to the machine in the current state, we * return its ID as the first element of the array */ if (it->fInCurState) ++size; if (size > 0) { snapshotIds.reset(size); size_t j = 0; if (it->fInCurState) it->machineId.toUtf16().detachTo(&snapshotIds[j++]); for (BackRef::GuidList::const_iterator jt = it->llSnapshotIds.begin(); jt != it->llSnapshotIds.end(); ++jt, ++j) { (*jt).toUtf16().detachTo(&snapshotIds[j]); } } break; } } snapshotIds.detachTo(ComSafeArrayOutArg(aSnapshotIds)); return S_OK; } /** * @note @a aState may be NULL if the state value is not needed (only for * in-process calls). */ STDMETHODIMP Medium::LockRead(MediumState_T *aState) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /* Wait for a concurrently running queryInfo() to complete */ while (m->queryInfoRunning) { alock.leave(); RTSemEventMultiWait(m->queryInfoSem, RT_INDEFINITE_WAIT); alock.enter(); } /* return the current state before */ if (aState) *aState = m->state; HRESULT rc = S_OK; switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: case MediumState_LockedRead: { ++m->readers; ComAssertMsgBreak(m->readers != 0, ("Counter overflow"), rc = E_FAIL); /* Remember pre-lock state */ if (m->state != MediumState_LockedRead) m->preLockState = m->state; LogFlowThisFunc(("Okay - prev state=%d readers=%d\n", m->state, m->readers)); m->state = MediumState_LockedRead; break; } default: { LogFlowThisFunc(("Failing - state=%d\n", m->state)); rc = setStateError(); break; } } return rc; } /** * @note @a aState may be NULL if the state value is not needed (only for * in-process calls). */ STDMETHODIMP Medium::UnlockRead(MediumState_T *aState) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); HRESULT rc = S_OK; switch (m->state) { case MediumState_LockedRead: { Assert(m->readers != 0); --m->readers; /* Reset the state after the last reader */ if (m->readers == 0) m->state = m->preLockState; LogFlowThisFunc(("new state=%d\n", m->state)); break; } default: { LogFlowThisFunc(("Failing - state=%d\n", m->state)); rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr ("Medium '%s' is not locked for reading"), m->strLocationFull.raw()); break; } } /* return the current state after */ if (aState) *aState = m->state; return rc; } /** * @note @a aState may be NULL if the state value is not needed (only for * in-process calls). */ STDMETHODIMP Medium::LockWrite(MediumState_T *aState) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /* Wait for a concurrently running queryInfo() to complete */ while (m->queryInfoRunning) { alock.leave(); RTSemEventMultiWait(m->queryInfoSem, RT_INDEFINITE_WAIT); alock.enter(); } /* return the current state before */ if (aState) *aState = m->state; HRESULT rc = S_OK; switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: { m->preLockState = m->state; LogFlowThisFunc(("Okay - prev state=%d locationFull=%s\n", m->state, getLocationFull().c_str())); m->state = MediumState_LockedWrite; break; } default: { LogFlowThisFunc(("Failing - state=%d locationFull=%s\n", m->state, getLocationFull().c_str())); rc = setStateError(); break; } } return rc; } /** * @note @a aState may be NULL if the state value is not needed (only for * in-process calls). */ STDMETHODIMP Medium::UnlockWrite(MediumState_T *aState) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); HRESULT rc = S_OK; switch (m->state) { case MediumState_LockedWrite: { m->state = m->preLockState; LogFlowThisFunc(("new state=%d locationFull=%s\n", m->state, getLocationFull().c_str())); break; } default: { LogFlowThisFunc(("Failing - state=%d locationFull=%s\n", m->state, getLocationFull().c_str())); rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr ("Medium '%s' is not locked for writing"), m->strLocationFull.raw()); break; } } /* return the current state after */ if (aState) *aState = m->state; return rc; } STDMETHODIMP Medium::Close() { AutoMayUninitSpan mayUninitSpan(this); if (FAILED(mayUninitSpan.rc())) return mayUninitSpan.rc(); if (mayUninitSpan.alreadyInProgress()) return S_OK; // we're accessing parent/child and backrefs, so lock the tree first, then ourselves AutoMultiWriteLock2 multilock(&m->pVirtualBox->getMediaTreeLockHandle(), this->lockHandle() COMMA_LOCKVAL_SRC_POS); bool wasCreated = true; bool fNeedsSaveSettings = false; switch (m->state) { case MediumState_NotCreated: wasCreated = false; break; case MediumState_Created: case MediumState_Inaccessible: break; default: return setStateError(); } if (m->backRefs.size() != 0) return setError(VBOX_E_OBJECT_IN_USE, tr("Medium '%s' is attached to %d virtual machines"), m->strLocationFull.raw(), m->backRefs.size()); /* perform extra media-dependent close checks */ HRESULT rc = canClose(); if (FAILED(rc)) return rc; if (wasCreated) { /* remove from the list of known media before performing actual * uninitialization (to keep the media registry consistent on * failure to do so) */ rc = unregisterWithVirtualBox(&fNeedsSaveSettings); if (FAILED(rc)) return rc; } multilock.release(); if (fNeedsSaveSettings) { AutoWriteLock vboxlock(m->pVirtualBox COMMA_LOCKVAL_SRC_POS); m->pVirtualBox->saveSettings(); } /* cause uninit() to happen on success */ mayUninitSpan.acceptUninit(); return S_OK; } STDMETHODIMP Medium::GetProperty(IN_BSTR aName, BSTR *aValue) { CheckComArgStrNotEmptyOrNull(aName); CheckComArgOutPointerValid(aValue); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); Data::PropertyMap::const_iterator it = m->properties.find(Bstr(aName)); if (it == m->properties.end()) return setError(VBOX_E_OBJECT_NOT_FOUND, tr("Property '%ls' does not exist"), aName); if (it->second.isEmpty()) Bstr("").cloneTo(aValue); else it->second.cloneTo(aValue); return S_OK; } STDMETHODIMP Medium::SetProperty(IN_BSTR aName, IN_BSTR aValue) { CheckComArgStrNotEmptyOrNull(aName); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* VirtualBox::saveSettings() needs a write lock */ AutoMultiWriteLock2 alock(m->pVirtualBox, this COMMA_LOCKVAL_SRC_POS); switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: break; default: return setStateError(); } Data::PropertyMap::iterator it = m->properties.find(Bstr(aName)); if (it == m->properties.end()) return setError(VBOX_E_OBJECT_NOT_FOUND, tr("Property '%ls' does not exist"), aName); if (aValue && !*aValue) it->second = (const char *)NULL; else it->second = aValue; HRESULT rc = m->pVirtualBox->saveSettings(); return rc; } STDMETHODIMP Medium::GetProperties(IN_BSTR aNames, ComSafeArrayOut(BSTR, aReturnNames), ComSafeArrayOut(BSTR, aReturnValues)) { CheckComArgOutSafeArrayPointerValid(aReturnNames); CheckComArgOutSafeArrayPointerValid(aReturnValues); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); /// @todo make use of aNames according to the documentation NOREF(aNames); com::SafeArray names(m->properties.size()); com::SafeArray values(m->properties.size()); size_t i = 0; for (Data::PropertyMap::const_iterator it = m->properties.begin(); it != m->properties.end(); ++it) { it->first.cloneTo(&names[i]); if (it->second.isEmpty()) Bstr("").cloneTo(&values [i]); else it->second.cloneTo(&values [i]); ++ i; } names.detachTo(ComSafeArrayOutArg(aReturnNames)); values.detachTo(ComSafeArrayOutArg(aReturnValues)); return S_OK; } STDMETHODIMP Medium::SetProperties(ComSafeArrayIn(IN_BSTR, aNames), ComSafeArrayIn(IN_BSTR, aValues)) { CheckComArgSafeArrayNotNull(aNames); CheckComArgSafeArrayNotNull(aValues); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* VirtualBox::saveSettings() needs a write lock */ AutoMultiWriteLock2 alock(m->pVirtualBox, this COMMA_LOCKVAL_SRC_POS); com::SafeArray names(ComSafeArrayInArg(aNames)); com::SafeArray values(ComSafeArrayInArg(aValues)); /* first pass: validate names */ for (size_t i = 0; i < names.size(); ++i) { if (m->properties.find(Bstr(names[i])) == m->properties.end()) return setError(VBOX_E_OBJECT_NOT_FOUND, tr("Property '%ls' does not exist"), names[i]); } /* second pass: assign */ for (size_t i = 0; i < names.size(); ++i) { Data::PropertyMap::iterator it = m->properties.find(Bstr(names[i])); AssertReturn(it != m->properties.end(), E_FAIL); if (values[i] && !*values[i]) it->second = (const char *)NULL; else it->second = values [i]; } HRESULT rc = m->pVirtualBox->saveSettings(); return rc; } STDMETHODIMP Medium::CreateBaseStorage(ULONG64 aLogicalSize, MediumVariant_T aVariant, IProgress **aProgress) { CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); aVariant = (MediumVariant_T)((unsigned)aVariant & (unsigned)~MediumVariant_Diff); if ( !(aVariant & MediumVariant_Fixed) && !(m->formatObj->capabilities() & MediumFormatCapabilities_CreateDynamic)) return setError(VBOX_E_NOT_SUPPORTED, tr("Hard disk format '%s' does not support dynamic storage creation"), m->strFormat.raw()); if ( (aVariant & MediumVariant_Fixed) && !(m->formatObj->capabilities() & MediumFormatCapabilities_CreateDynamic)) return setError(VBOX_E_NOT_SUPPORTED, tr("Hard disk format '%s' does not support fixed storage creation"), m->strFormat.raw()); switch (m->state) { case MediumState_NotCreated: break; default: return setStateError(); } ComObjPtr progress; progress.createObject(); /// @todo include fixed/dynamic HRESULT rc = progress->init(m->pVirtualBox, static_cast(this), (aVariant & MediumVariant_Fixed) ? BstrFmt(tr("Creating fixed hard disk storage unit '%s'"), m->strLocationFull.raw()) : BstrFmt(tr("Creating dynamic hard disk storage unit '%s'"), m->strLocationFull.raw()), TRUE /* aCancelable */); if (FAILED(rc)) return rc; /* setup task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::CreateBase)); AssertComRCReturnRC(task->m_autoCaller.rc()); task->d.size = aLogicalSize; task->d.variant = aVariant; rc = task->startThread(); if (FAILED(rc)) return rc; /* go to Creating state on success */ m->state = MediumState_Creating; /* task is now owned by taskThread() so release it */ task.release(); /* return progress to the caller */ progress.queryInterfaceTo(aProgress); return S_OK; } STDMETHODIMP Medium::DeleteStorage(IProgress **aProgress) { CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); ComObjPtr progress; HRESULT rc = deleteStorageNoWait(progress); if (SUCCEEDED(rc)) { /* return progress to the caller */ progress.queryInterfaceTo(aProgress); } return rc; } STDMETHODIMP Medium::CreateDiffStorage(IMedium *aTarget, MediumVariant_T aVariant, IProgress **aProgress) { CheckComArgNotNull(aTarget); CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); ComObjPtr diff = static_cast(aTarget); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); if (m->type == MediumType_Writethrough) return setError(E_FAIL, tr("Hard disk '%s' is Writethrough"), m->strLocationFull.raw()); /* We want to be locked for reading as long as our diff child is being * created */ HRESULT rc = LockRead(NULL); if (FAILED(rc)) return rc; ComObjPtr progress; rc = createDiffStorageNoWait(diff, aVariant, progress); if (FAILED(rc)) { HRESULT rc2 = UnlockRead(NULL); AssertComRC(rc2); /* Note: on success, taskThread() will unlock this */ } else { /* return progress to the caller */ progress.queryInterfaceTo(aProgress); } return rc; } STDMETHODIMP Medium::MergeTo(IN_BSTR /* aTargetId */, IProgress ** /* aProgress */) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); ReturnComNotImplemented(); } STDMETHODIMP Medium::CloneTo(IMedium *aTarget, MediumVariant_T aVariant, IMedium *aParent, IProgress **aProgress) { CheckComArgNotNull(aTarget); CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); ComObjPtr target = static_cast(aTarget); ComObjPtr parent; if (aParent) parent = static_cast(aParent); AutoMultiWriteLock3 alock(this, target, parent COMMA_LOCKVAL_SRC_POS); ComObjPtr progress; HRESULT rc = S_OK; try { if ( target->m->state != MediumState_NotCreated && target->m->state != MediumState_Created) throw target->setStateError(); /** @todo separate out creating/locking an image chain from * SessionMachine::lockMedia and use it from here too. * logically this belongs into Medium functionality. */ /* Build the source chain and lock images in the proper order. */ std::auto_ptr srcChain(new ImageChain()); /* we walk the source tree */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); for (Medium *hd = this; hd; hd = hd->m->pParent) { rc = srcChain->addImage(hd); if (FAILED(rc)) throw rc; } rc = srcChain->lockImagesRead(); if (FAILED(rc)) throw rc; /* Build the parent chain and lock images in the proper order. */ std::auto_ptr parentChain(new ImageChain()); for (Medium *hd = parent; hd; hd = hd->m->pParent) { rc = parentChain->addImage(hd); if (FAILED(rc)) throw rc; } if (target->m->state == MediumState_Created) { /* If we're cloning to an existing image the parent chain also * contains the target image, and it gets locked for writing. */ rc = parentChain->addImage(target); if (FAILED(rc)) throw rc; rc = parentChain->lockImagesReadAndLastWrite(); if (FAILED(rc)) throw rc; } else { rc = parentChain->lockImagesRead(); if (FAILED(rc)) throw rc; } progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast (this), BstrFmt(tr("Creating clone hard disk '%s'"), target->m->strLocationFull.raw()), TRUE /* aCancelable */); if (FAILED(rc)) throw rc; /* setup task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::Clone)); AssertComRCThrowRC(task->m_autoCaller.rc()); task->setData(target, parent); task->d.variant = aVariant; task->setData(srcChain.release(), parentChain.release()); rc = task->startThread(); if (FAILED(rc)) throw rc; if (target->m->state == MediumState_NotCreated) { /* go to Creating state before leaving the lock */ target->m->state = MediumState_Creating; } /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); } catch (HRESULT aRC) { rc = aRC; } if (SUCCEEDED(rc)) { /* return progress to the caller */ progress.queryInterfaceTo(aProgress); } return rc; } STDMETHODIMP Medium::Compact(IProgress **aProgress) { CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); ComObjPtr progress; HRESULT rc = S_OK; try { /** @todo separate out creating/locking an image chain from * SessionMachine::lockMedia and use it from here too. * logically this belongs into Medium functionality. */ /* Build the image chain and lock images in the proper order. */ std::auto_ptr imgChain(new ImageChain()); /* we walk the image tree */ AutoReadLock srcTreeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); for (Medium *hd = this; hd; hd = hd->m->pParent) { rc = imgChain->addImage(hd); if (FAILED(rc)) throw rc; } rc = imgChain->lockImagesReadAndLastWrite(); if (FAILED(rc)) throw rc; progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast (this), BstrFmt(tr("Compacting hard disk '%s'"), m->strLocationFull.raw()), TRUE /* aCancelable */); if (FAILED(rc)) throw rc; /* setup task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::Compact)); AssertComRCThrowRC(task->m_autoCaller.rc()); task->setData(imgChain.release()); rc = task->startThread(); if (FAILED(rc)) throw rc; /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); } catch (HRESULT aRC) { rc = aRC; } if (SUCCEEDED(rc)) { /* return progress to the caller */ progress.queryInterfaceTo(aProgress); } return rc; } STDMETHODIMP Medium::Resize(ULONG64 aLogicalSize, IProgress **aProgress) { CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); NOREF(aLogicalSize); NOREF(aProgress); ReturnComNotImplemented(); } STDMETHODIMP Medium::Reset(IProgress **aProgress) { CheckComArgOutPointerValid(aProgress); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* canClose() needs the tree lock */ AutoMultiWriteLock2 multilock(&m->pVirtualBox->getMediaTreeLockHandle(), this->lockHandle() COMMA_LOCKVAL_SRC_POS); LogFlowThisFunc(("ENTER for medium %s\n", m->strLocationFull.c_str())); if (m->pParent.isNull()) return setError(VBOX_E_NOT_SUPPORTED, tr ("Hard disk '%s' is not differencing"), m->strLocationFull.raw()); HRESULT rc = canClose(); if (FAILED(rc)) return rc; rc = LockWrite(NULL); if (FAILED(rc)) return rc; ComObjPtr progress; try { progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast(this), BstrFmt(tr("Resetting differencing hard disk '%s'"), m->strLocationFull.raw()), FALSE /* aCancelable */); if (FAILED(rc)) throw rc; /* setup task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::Reset)); AssertComRCThrowRC(task->m_autoCaller.rc()); rc = task->startThread(); if (FAILED(rc)) throw rc; /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); } catch (HRESULT aRC) { rc = aRC; } if (FAILED (rc)) { HRESULT rc2 = UnlockWrite(NULL); AssertComRC(rc2); /* Note: on success, taskThread() will unlock this */ } else { /* return progress to the caller */ progress.queryInterfaceTo(aProgress); } LogFlowThisFunc(("LEAVE, rc=%Rhrc\n", rc)); return rc; } //////////////////////////////////////////////////////////////////////////////// // // Medium internal methods // //////////////////////////////////////////////////////////////////////////////// /** * Internal method to return the medium's parent medium. Must have caller + locking! * @return */ const ComObjPtr& Medium::getParent() const { return m->pParent; } /** * Internal method to return the medium's list of child media. Must have caller + locking! * @return */ const MediaList& Medium::getChildren() const { return m->llChildren; } /** * Internal method to return the medium's GUID. Must have caller + locking! * @return */ const Guid& Medium::getId() const { return m->id; } /** * Internal method to return the medium's GUID. Must have caller + locking! * @return */ MediumState_T Medium::getState() const { return m->state; } /** * Internal method to return the medium's location. Must have caller + locking! * @return */ const Utf8Str& Medium::getLocation() const { return m->strLocation; } /** * Internal method to return the medium's full location. Must have caller + locking! * @return */ const Utf8Str& Medium::getLocationFull() const { return m->strLocationFull; } /** * Internal method to return the medium's size. Must have caller + locking! * @return */ uint64_t Medium::getSize() const { return m->size; } /** * Adds the given machine and optionally the snapshot to the list of the objects * this image is attached to. * * @param aMachineId Machine ID. * @param aSnapshotId Snapshot ID; when non-empty, adds a snapshot attachment. */ HRESULT Medium::attachTo(const Guid &aMachineId, const Guid &aSnapshotId /*= Guid::Empty*/) { AssertReturn(!aMachineId.isEmpty(), E_FAIL); LogFlowThisFunc(("ENTER, aMachineId: {%RTuuid}, aSnapshotId: {%RTuuid}\n", aMachineId.raw(), aSnapshotId.raw())); AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: case MediumState_LockedRead: case MediumState_LockedWrite: break; default: return setStateError(); } if (m->numCreateDiffTasks > 0) return setError(E_FAIL, tr("Cannot attach hard disk '%s' {%RTuuid}: %u differencing child hard disk(s) are being created"), m->strLocationFull.raw(), m->id.raw(), m->numCreateDiffTasks); BackRefList::iterator it = std::find_if(m->backRefs.begin(), m->backRefs.end(), BackRef::EqualsTo(aMachineId)); if (it == m->backRefs.end()) { BackRef ref(aMachineId, aSnapshotId); m->backRefs.push_back(ref); return S_OK; } // if the caller has not supplied a snapshot ID, then we're attaching // to a machine a medium which represents the machine's current state, // so set the flag if (aSnapshotId.isEmpty()) { /* sanity: no duplicate attachments */ AssertReturn(!it->fInCurState, E_FAIL); it->fInCurState = true; return S_OK; } // otherwise: a snapshot medium is being attached /* sanity: no duplicate attachments */ for (BackRef::GuidList::const_iterator jt = it->llSnapshotIds.begin(); jt != it->llSnapshotIds.end(); ++jt) { const Guid &idOldSnapshot = *jt; if (idOldSnapshot == aSnapshotId) { #ifdef DEBUG dumpBackRefs(); #endif return setError(E_FAIL, tr("Cannot attach medium '%s' {%RTuuid} from snapshot '%RTuuid': medium is already in use by this snapshot!"), m->strLocationFull.raw(), m->id.raw(), aSnapshotId.raw(), idOldSnapshot.raw()); } } it->llSnapshotIds.push_back(aSnapshotId); it->fInCurState = false; LogFlowThisFuncLeave(); return S_OK; } /** * Removes the given machine and optionally the snapshot from the list of the * objects this image is attached to. * * @param aMachineId Machine ID. * @param aSnapshotId Snapshot ID; when non-empty, removes the snapshot * attachment. */ HRESULT Medium::detachFrom(const Guid &aMachineId, const Guid &aSnapshotId /*= Guid::Empty*/) { AssertReturn(!aMachineId.isEmpty(), E_FAIL); AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); BackRefList::iterator it = std::find_if(m->backRefs.begin(), m->backRefs.end(), BackRef::EqualsTo(aMachineId)); AssertReturn(it != m->backRefs.end(), E_FAIL); if (aSnapshotId.isEmpty()) { /* remove the current state attachment */ it->fInCurState = false; } else { /* remove the snapshot attachment */ BackRef::GuidList::iterator jt = std::find(it->llSnapshotIds.begin(), it->llSnapshotIds.end(), aSnapshotId); AssertReturn(jt != it->llSnapshotIds.end(), E_FAIL); it->llSnapshotIds.erase(jt); } /* if the backref becomes empty, remove it */ if (it->fInCurState == false && it->llSnapshotIds.size() == 0) m->backRefs.erase(it); return S_OK; } /** * Internal method to return the medium's list of backrefs. Must have caller + locking! * @return */ const Guid* Medium::getFirstMachineBackrefId() const { if (!m->backRefs.size()) return NULL; return &m->backRefs.front().machineId; } const Guid* Medium::getFirstMachineBackrefSnapshotId() const { if (!m->backRefs.size()) return NULL; const BackRef &ref = m->backRefs.front(); if (!ref.llSnapshotIds.size()) return NULL; return &ref.llSnapshotIds.front(); } #ifdef DEBUG /** * Debugging helper that gets called after VirtualBox initialization that writes all * machine backreferences to the debug log. */ void Medium::dumpBackRefs() { AutoCaller autoCaller(this); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); LogFlowThisFunc(("Dumping backrefs for medium '%s':\n", m->strLocationFull.raw())); for (BackRefList::iterator it2 = m->backRefs.begin(); it2 != m->backRefs.end(); ++it2) { const BackRef &ref = *it2; LogFlowThisFunc((" Backref from machine {%RTuuid} (fInCurState: %d)\n", ref.machineId.raw(), ref.fInCurState)); for (BackRef::GuidList::const_iterator jt2 = it2->llSnapshotIds.begin(); jt2 != it2->llSnapshotIds.end(); ++jt2) { const Guid &id = *jt2; LogFlowThisFunc((" Backref from snapshot {%RTuuid}\n", id.raw())); } } } #endif /** * Checks if the given change of \a aOldPath to \a aNewPath affects the location * of this media and updates it if necessary to reflect the new location. * * @param aOldPath Old path (full). * @param aNewPath New path (full). * * @note Locks this object for writing. */ HRESULT Medium::updatePath(const char *aOldPath, const char *aNewPath) { AssertReturn(aOldPath, E_FAIL); AssertReturn(aNewPath, E_FAIL); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); LogFlowThisFunc(("locationFull.before='%s'\n", m->strLocationFull.raw())); Utf8Str path = m->strLocationFull; if (RTPathStartsWith(path.c_str(), aOldPath)) { Utf8Str newPath = Utf8StrFmt("%s%s", aNewPath, path.raw() + strlen(aOldPath)); path = newPath; m->pVirtualBox->calculateRelativePath(path, path); unconst(m->strLocationFull) = newPath; unconst(m->strLocation) = path; LogFlowThisFunc(("locationFull.after='%s'\n", m->strLocationFull.raw())); } return S_OK; } /** * Checks if the given change of \a aOldPath to \a aNewPath affects the location * of this hard disk or any its child and updates the paths if necessary to * reflect the new location. * * @param aOldPath Old path (full). * @param aNewPath New path (full). * * @note Locks getTreeLock() for reading, this object and all children for writing. */ void Medium::updatePaths(const char *aOldPath, const char *aNewPath) { AssertReturnVoid(aOldPath); AssertReturnVoid(aNewPath); AutoCaller autoCaller(this); AssertComRCReturnVoid(autoCaller.rc()); AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /* we access children() */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); updatePath(aOldPath, aNewPath); /* update paths of all children */ for (MediaList::const_iterator it = getChildren().begin(); it != getChildren().end(); ++ it) { (*it)->updatePaths(aOldPath, aNewPath); } } /** * Returns the base hard disk of the hard disk chain this hard disk is part of. * * The base hard disk is found by walking up the parent-child relationship axis. * If the hard disk doesn't have a parent (i.e. it's a base hard disk), it * returns itself in response to this method. * * @param aLevel Where to store the number of ancestors of this hard disk * (zero for the base), may be @c NULL. * * @note Locks getTreeLock() for reading. */ ComObjPtr Medium::getBase(uint32_t *aLevel /*= NULL*/) { ComObjPtr pBase; uint32_t level; AutoCaller autoCaller(this); AssertReturn(autoCaller.isOk(), pBase); /* we access mParent */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); pBase = this; level = 0; if (m->pParent) { for (;;) { AutoCaller baseCaller(pBase); AssertReturn(baseCaller.isOk(), pBase); if (pBase->m->pParent.isNull()) break; pBase = pBase->m->pParent; ++level; } } if (aLevel != NULL) *aLevel = level; return pBase; } /** * Returns @c true if this hard disk cannot be modified because it has * dependants (children) or is part of the snapshot. Related to the hard disk * type and posterity, not to the current media state. * * @note Locks this object and getTreeLock() for reading. */ bool Medium::isReadOnly() { AutoCaller autoCaller(this); AssertComRCReturn(autoCaller.rc(), false); /* we access children */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); switch (m->type) { case MediumType_Normal: { if (getChildren().size() != 0) return true; for (BackRefList::const_iterator it = m->backRefs.begin(); it != m->backRefs.end(); ++ it) if (it->llSnapshotIds.size() != 0) return true; return false; } case MediumType_Immutable: { return true; } case MediumType_Writethrough: { return false; } default: break; } AssertFailedReturn(false); } /** * Saves hard disk data by appending a new child node to the given * parent node which can be either or . * * @param data Settings struct to be updated. * * @note Locks this object, getTreeLock() and children for reading. */ HRESULT Medium::saveSettings(settings::Medium &data) { AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); /* we access mParent */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); data.uuid = m->id; data.strLocation = m->strLocation; data.strFormat = m->strFormat; /* optional, only for diffs, default is false */ if (m->pParent) data.fAutoReset = !!m->autoReset; else data.fAutoReset = false; /* optional */ data.strDescription = m->strDescription; /* optional properties */ data.properties.clear(); for (Data::PropertyMap::const_iterator it = m->properties.begin(); it != m->properties.end(); ++it) { /* only save properties that have non-default values */ if (!it->second.isNull()) { Utf8Str name = it->first; Utf8Str value = it->second; data.properties[name] = value; } } /* only for base hard disks */ if (m->pParent.isNull()) data.hdType = m->type; /* save all children */ for (MediaList::const_iterator it = getChildren().begin(); it != getChildren().end(); ++it) { settings::Medium med; HRESULT rc = (*it)->saveSettings(med); AssertComRCReturnRC(rc); data.llChildren.push_back(med); } return S_OK; } /** * Compares the location of this hard disk to the given location. * * The comparison takes the location details into account. For example, if the * location is a file in the host's filesystem, a case insensitive comparison * will be performed for case insensitive filesystems. * * @param aLocation Location to compare to (as is). * @param aResult Where to store the result of comparison: 0 if locations * are equal, 1 if this object's location is greater than * the specified location, and -1 otherwise. */ HRESULT Medium::compareLocationTo(const char *aLocation, int &aResult) { AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); Utf8Str locationFull(m->strLocationFull); /// @todo NEWMEDIA delegate the comparison to the backend? if (m->formatObj->capabilities() & MediumFormatCapabilities_File) { Utf8Str location(aLocation); /* For locations represented by files, append the default path if * only the name is given, and then get the full path. */ if (!RTPathHavePath(aLocation)) { location = Utf8StrFmt("%s%c%s", m->pVirtualBox->getDefaultHardDiskFolder().raw(), RTPATH_DELIMITER, aLocation); } int vrc = m->pVirtualBox->calculateFullPath(location, location); if (RT_FAILURE(vrc)) return setError(E_FAIL, tr("Invalid hard disk storage file location '%s' (%Rrc)"), location.raw(), vrc); aResult = RTPathCompare(locationFull.c_str(), location.c_str()); } else aResult = locationFull.compare(aLocation); return S_OK; } /** * Checks that this hard disk may be discarded and performs necessary state * changes. * * This method is to be called prior to calling the #discard() to perform * necessary consistency checks and place involved hard disks to appropriate * states. If #discard() is not called or fails, the state modifications * performed by this method must be undone by #cancelDiscard(). * * See #discard() for more info about discarding hard disks. * * @param aChain Where to store the created merge chain (may return NULL * if no real merge is necessary). * * @note Caller must hold media tree lock for writing. This locks this object * and every medium object on the merge chain for writing. */ HRESULT Medium::prepareDiscard(MergeChain * &aChain) { AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); aChain = NULL; AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); Assert(m->pVirtualBox->getMediaTreeLockHandle().isWriteLockOnCurrentThread()); AssertReturn(m->type == MediumType_Normal, E_FAIL); if (getChildren().size() == 0) { /* special treatment of the last hard disk in the chain: */ if (m->pParent.isNull()) { /* lock only, to prevent any usage; discard() will unlock */ return LockWrite(NULL); } /* the differencing hard disk w/o children will be deleted, protect it * from attaching to other VMs (this is why Deleting) */ switch (m->state) { case MediumState_Created: m->state = MediumState_Deleting; break; default: return setStateError(); } /* aChain is intentionally NULL here */ return S_OK; } /* not going multi-merge as it's too expensive */ if (getChildren().size() > 1) return setError(E_FAIL, tr ("Hard disk '%s' has more than one child hard disk (%d)"), m->strLocationFull.raw(), getChildren().size()); /* this is a read-only hard disk with children; it must be associated with * exactly one snapshot (when the snapshot is being taken, none of the * current VM's hard disks may be attached to other VMs). Note that by the * time when discard() is called, there must be no any attachments at all * (the code calling prepareDiscard() should detach). */ AssertReturn(m->backRefs.size() == 1, E_FAIL); AssertReturn(!m->backRefs.front().fInCurState, E_FAIL); AssertReturn(m->backRefs.front().llSnapshotIds.size() == 1, E_FAIL); ComObjPtr child = getChildren().front(); /* we keep this locked, so lock the affected child to make sure the lock * order is correct when calling prepareMergeTo() */ AutoWriteLock childLock(child COMMA_LOCKVAL_SRC_POS); /* delegate the rest to the profi */ if (m->pParent.isNull()) { /* base hard disk, backward merge */ Assert(child->m->backRefs.size() == 1); if (child->m->backRefs.front().machineId != m->backRefs.front().machineId) { /* backward merge is too tricky, we'll just detach on discard, so * lock only, to prevent any usage; discard() will only unlock * (since we return NULL in aChain) */ return LockWrite(NULL); } return child->prepareMergeTo(this, aChain, true /* aIgnoreAttachments */); } else { /* forward merge */ return prepareMergeTo(child, aChain, true /* aIgnoreAttachments */); } } /** * Discards this hard disk. * * Discarding the hard disk is merging its contents to its differencing child * hard disk (forward merge) or contents of its child hard disk to itself * (backward merge) if this hard disk is a base hard disk. If this hard disk is * a differencing hard disk w/o children, then it will be simply deleted. * Calling this method on a base hard disk w/o children will do nothing and * silently succeed. If this hard disk has more than one child, the method will * currently return an error (since merging in this case would be too expensive * and result in data duplication). * * When the backward merge takes place (i.e. this hard disk is a target) then, * on success, this hard disk will automatically replace the differencing child * hard disk used as a source (which will then be deleted) in the attachment * this child hard disk is associated with. This will happen only if both hard * disks belong to the same machine because otherwise such a replace would be * too tricky and could be not expected by the other machine. Same relates to a * case when the child hard disk is not associated with any machine at all. When * the backward merge is not applied, the method behaves as if the base hard * disk were not attached at all -- i.e. simply detaches it from the machine but * leaves the hard disk chain intact. * * This method is basically a wrapper around #mergeTo() that selects the correct * merge direction and performs additional actions as described above and. * * Note that this method will not return until the merge operation is complete * (which may be quite time consuming depending on the size of the merged hard * disks). * * Note that #prepareDiscard() must be called before calling this method. If * this method returns a failure, the caller must call #cancelDiscard(). On * success, #cancelDiscard() must not be called (this method will perform all * necessary steps such as resetting states of all involved hard disks and * deleting @a aChain). * * @param aChain Merge chain created by #prepareDiscard() (may be NULL if * no real merge takes place). * * @note Locks the hard disks from the chain for writing. Locks the machine * object when the backward merge takes place. Locks getTreeLock() lock for * reading or writing. */ HRESULT Medium::discard(ComObjPtr &aProgress, ULONG ulWeight, MergeChain *aChain, bool *pfNeedsSaveSettings) { AssertReturn(!aProgress.isNull(), E_FAIL); ComObjPtr hdFrom; HRESULT rc = S_OK; { AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); aProgress->SetNextOperation(BstrFmt(tr("Merging differencing image '%s'"), getName().raw()), ulWeight); // weight if (aChain == NULL) { /* we access mParent & children() */ AutoMultiWriteLock2 mLock(&m->pVirtualBox->getMediaTreeLockHandle(), this->lockHandle() COMMA_LOCKVAL_SRC_POS); Assert(getChildren().size() == 0); /* special treatment of the last hard disk in the chain: */ if (m->pParent.isNull()) { rc = UnlockWrite(NULL); AssertComRC(rc); return rc; } /* delete the differencing hard disk w/o children */ Assert(m->state == MediumState_Deleting); /* go back to Created since deleteStorage() expects this state */ m->state = MediumState_Created; hdFrom = this; rc = deleteStorageAndWait(&aProgress, pfNeedsSaveSettings); } else { hdFrom = aChain->source(); rc = hdFrom->mergeToAndWait(aChain, &aProgress, pfNeedsSaveSettings); } } if (SUCCEEDED(rc)) { /* mergeToAndWait() cannot uninitialize the initiator because of * possible AutoCallers on the current thread, deleteStorageAndWait() * doesn't do it either; do it ourselves */ hdFrom->uninit(); } return rc; } /** * Undoes what #prepareDiscard() did. Must be called if #discard() is not called * or fails. Frees memory occupied by @a aChain. * * @param aChain Merge chain created by #prepareDiscard() (may be NULL if * no real merge takes place). * * @note Locks the hard disks from the chain for writing. Locks getTreeLock() for * reading. */ void Medium::cancelDiscard(MergeChain *aChain) { AutoCaller autoCaller(this); AssertComRCReturnVoid(autoCaller.rc()); if (aChain == NULL) { AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); /* we access mParent & children() */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); Assert(getChildren().size() == 0); /* special treatment of the last hard disk in the chain: */ if (m->pParent.isNull()) { HRESULT rc = UnlockWrite(NULL); AssertComRC(rc); return; } /* the differencing hard disk w/o children will be deleted, protect it * from attaching to other VMs (this is why Deleting) */ Assert(m->state == MediumState_Deleting); m->state = MediumState_Created; return; } /* delegate the rest to the profi */ cancelMergeTo(aChain); } /** * Returns a preferred format for differencing hard disks. */ Bstr Medium::preferredDiffFormat() { Utf8Str strFormat; AutoCaller autoCaller(this); AssertComRCReturn(autoCaller.rc(), strFormat); /* m->format is const, no need to lock */ strFormat = m->strFormat; /* check that our own format supports diffs */ if (!(m->formatObj->capabilities() & MediumFormatCapabilities_Differencing)) { /* use the default format if not */ AutoReadLock propsLock(m->pVirtualBox->systemProperties() COMMA_LOCKVAL_SRC_POS); strFormat = m->pVirtualBox->getDefaultHardDiskFormat(); } return strFormat; } /** * Returns the medium type. Must have caller + locking! * @return */ MediumType_T Medium::getType() const { return m->type; } // private methods //////////////////////////////////////////////////////////////////////////////// /** * Returns a short version of the location attribute. * * @note Must be called from under this object's read or write lock. */ Utf8Str Medium::getName() { Utf8Str name = RTPathFilename(m->strLocationFull.c_str()); return name; } /** * Sets the value of m->strLocation and calculates the value of m->strLocationFull. * * Treats non-FS-path locations specially, and prepends the default hard disk * folder if the given location string does not contain any path information * at all. * * Also, if the specified location is a file path that ends with '/' then the * file name part will be generated by this method automatically in the format * '{}.' where is a fresh UUID that this method will generate * and assign to this medium, and is the default extension for this * medium's storage format. Note that this procedure requires the media state to * be NotCreated and will return a failure otherwise. * * @param aLocation Location of the storage unit. If the location is a FS-path, * then it can be relative to the VirtualBox home directory. * @param aFormat Optional fallback format if it is an import and the format * cannot be determined. * * @note Must be called from under this object's write lock. */ HRESULT Medium::setLocation(const Utf8Str &aLocation, const Utf8Str &aFormat) { AssertReturn(!aLocation.isEmpty(), E_FAIL); AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); /* formatObj may be null only when initializing from an existing path and * no format is known yet */ AssertReturn( (!m->strFormat.isEmpty() && !m->formatObj.isNull()) || ( autoCaller.state() == InInit && m->state != MediumState_NotCreated && m->id.isEmpty() && m->strFormat.isEmpty() && m->formatObj.isNull()), E_FAIL); /* are we dealing with a new medium constructed using the existing * location? */ bool isImport = m->strFormat.isEmpty(); if ( isImport || ( (m->formatObj->capabilities() & MediumFormatCapabilities_File) && !m->hostDrive)) { Guid id; Utf8Str location(aLocation); if (m->state == MediumState_NotCreated) { /* must be a file (formatObj must be already known) */ Assert(m->formatObj->capabilities() & MediumFormatCapabilities_File); if (RTPathFilename(location.c_str()) == NULL) { /* no file name is given (either an empty string or ends with a * slash), generate a new UUID + file name if the state allows * this */ ComAssertMsgRet(!m->formatObj->fileExtensions().empty(), ("Must be at least one extension if it is MediumFormatCapabilities_File\n"), E_FAIL); Bstr ext = m->formatObj->fileExtensions().front(); ComAssertMsgRet(!ext.isEmpty(), ("Default extension must not be empty\n"), E_FAIL); id.create(); location = Utf8StrFmt("%s{%RTuuid}.%ls", location.raw(), id.raw(), ext.raw()); } } /* append the default folder if no path is given */ if (!RTPathHavePath(location.c_str())) location = Utf8StrFmt("%s%c%s", m->pVirtualBox->getDefaultHardDiskFolder().raw(), RTPATH_DELIMITER, location.raw()); /* get the full file name */ Utf8Str locationFull; int vrc = m->pVirtualBox->calculateFullPath(location, locationFull); if (RT_FAILURE(vrc)) return setError(VBOX_E_FILE_ERROR, tr("Invalid medium storage file location '%s' (%Rrc)"), location.raw(), vrc); /* detect the backend from the storage unit if importing */ if (isImport) { char *backendName = NULL; /* is it a file? */ { RTFILE file; vrc = RTFileOpen(&file, locationFull.c_str(), RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE); if (RT_SUCCESS(vrc)) RTFileClose(file); } if (RT_SUCCESS(vrc)) { vrc = VDGetFormat(NULL, locationFull.c_str(), &backendName); } else if (vrc != VERR_FILE_NOT_FOUND && vrc != VERR_PATH_NOT_FOUND) { /* assume it's not a file, restore the original location */ location = locationFull = aLocation; vrc = VDGetFormat(NULL, locationFull.c_str(), &backendName); } if (RT_FAILURE(vrc)) { if (vrc == VERR_FILE_NOT_FOUND || vrc == VERR_PATH_NOT_FOUND) return setError(VBOX_E_FILE_ERROR, tr("Could not find file for the medium '%s' (%Rrc)"), locationFull.raw(), vrc); else if (aFormat.isEmpty()) return setError(VBOX_E_IPRT_ERROR, tr("Could not get the storage format of the medium '%s' (%Rrc)"), locationFull.raw(), vrc); else { HRESULT rc = setFormat(Bstr(aFormat)); /* setFormat() must not fail since we've just used the backend so * the format object must be there */ AssertComRCReturnRC(rc); } } else { ComAssertRet(backendName != NULL && *backendName != '\0', E_FAIL); HRESULT rc = setFormat(Bstr(backendName)); RTStrFree(backendName); /* setFormat() must not fail since we've just used the backend so * the format object must be there */ AssertComRCReturnRC(rc); } } /* is it still a file? */ if (m->formatObj->capabilities() & MediumFormatCapabilities_File) { m->strLocation = location; m->strLocationFull = locationFull; if (m->state == MediumState_NotCreated) { /* assign a new UUID (this UUID will be used when calling * VDCreateBase/VDCreateDiff as a wanted UUID). Note that we * also do that if we didn't generate it to make sure it is * either generated by us or reset to null */ unconst(m->id) = id; } } else { m->strLocation = locationFull; m->strLocationFull = locationFull; } } else { m->strLocation = aLocation; m->strLocationFull = aLocation; } return S_OK; } /** * Queries information from the image file. * * As a result of this call, the accessibility state and data members such as * size and description will be updated with the current information. * * @note This method may block during a system I/O call that checks storage * accessibility. * * @note Locks getTreeLock() for reading and writing (for new diff media checked * for the first time). Locks mParent for reading. Locks this object for * writing. */ HRESULT Medium::queryInfo() { AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS); if ( m->state != MediumState_Created && m->state != MediumState_Inaccessible && m->state != MediumState_LockedRead) return E_FAIL; HRESULT rc = S_OK; int vrc = VINF_SUCCESS; /* check if a blocking queryInfo() call is in progress on some other thread, * and wait for it to finish if so instead of querying data ourselves */ if (m->queryInfoRunning) { Assert( m->state == MediumState_LockedRead || m->state == MediumState_LockedWrite); alock.leave(); vrc = RTSemEventMultiWait(m->queryInfoSem, RT_INDEFINITE_WAIT); alock.enter(); AssertRC(vrc); return S_OK; } bool success = false; Utf8Str lastAccessError; /* are we dealing with a new medium constructed using the existing * location? */ bool isImport = m->id.isEmpty(); unsigned flags = VD_OPEN_FLAGS_INFO; /* Note that we don't use VD_OPEN_FLAGS_READONLY when opening new * media because that would prevent necessary modifications * when opening media of some third-party formats for the first * time in VirtualBox (such as VMDK for which VDOpen() needs to * generate an UUID if it is missing) */ if ( (m->hddOpenMode == OpenReadOnly) || !isImport ) flags |= VD_OPEN_FLAGS_READONLY; /* Lock the medium, which makes the behavior much more consistent */ if (flags & VD_OPEN_FLAGS_READONLY) rc = LockRead(NULL); else rc = LockWrite(NULL); if (FAILED(rc)) return rc; /* Copies of the input state fields which are not read-only, * as we're dropping the lock. CAUTION: be extremely careful what * you do with the contents of this medium object, as you will * create races if there are concurrent changes. */ Utf8Str format(m->strFormat); Utf8Str location(m->strLocationFull); ComObjPtr formatObj = m->formatObj; /* "Output" values which can't be set because the lock isn't held * at the time the values are determined. */ Guid mediumId = m->id; uint64_t mediumSize = 0; uint64_t mediumLogicalSize = 0; /* leave the lock before a lengthy operation */ vrc = RTSemEventMultiReset(m->queryInfoSem); ComAssertRCThrow(vrc, E_FAIL); m->queryInfoRunning = true; alock.leave(); try { /* skip accessibility checks for host drives */ if (m->hostDrive) { success = true; throw S_OK; } PVBOXHDD hdd; vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); try { /** @todo This kind of opening of images is assuming that diff * images can be opened as base images. Should be fixed ASAP. */ vrc = VDOpen(hdd, format.c_str(), location.c_str(), flags, m->vdDiskIfaces); if (RT_FAILURE(vrc)) { lastAccessError = Utf8StrFmt(tr("Could not open the medium '%s'%s"), location.c_str(), vdError(vrc).c_str()); throw S_OK; } if (formatObj->capabilities() & MediumFormatCapabilities_Uuid) { /* Modify the UUIDs if necessary. The associated fields are * not modified by other code, so no need to copy. */ if (m->setImageId) { vrc = VDSetUuid(hdd, 0, m->imageId); ComAssertRCThrow(vrc, E_FAIL); } if (m->setParentId) { vrc = VDSetParentUuid(hdd, 0, m->parentId); ComAssertRCThrow(vrc, E_FAIL); } /* zap the information, these are no long-term members */ m->setImageId = false; unconst(m->imageId).clear(); m->setParentId = false; unconst(m->parentId).clear(); /* check the UUID */ RTUUID uuid; vrc = VDGetUuid(hdd, 0, &uuid); ComAssertRCThrow(vrc, E_FAIL); if (isImport) { mediumId = uuid; if (mediumId.isEmpty() && (m->hddOpenMode == OpenReadOnly)) // only when importing a VDMK that has no UUID, create one in memory mediumId.create(); } else { Assert(!mediumId.isEmpty()); if (mediumId != uuid) { lastAccessError = Utf8StrFmt( tr("UUID {%RTuuid} of the medium '%s' does not match the value {%RTuuid} stored in the media registry ('%s')"), &uuid, location.c_str(), mediumId.raw(), m->pVirtualBox->settingsFilePath().c_str()); throw S_OK; } } } else { /* the backend does not support storing UUIDs within the * underlying storage so use what we store in XML */ /* generate an UUID for an imported UUID-less medium */ if (isImport) { if (m->setImageId) mediumId = m->imageId; else mediumId.create(); } } /* check the type */ unsigned uImageFlags; vrc = VDGetImageFlags(hdd, 0, &uImageFlags); ComAssertRCThrow(vrc, E_FAIL); if (uImageFlags & VD_IMAGE_FLAGS_DIFF) { RTUUID parentId; vrc = VDGetParentUuid(hdd, 0, &parentId); ComAssertRCThrow(vrc, E_FAIL); if (isImport) { /* the parent must be known to us. Note that we freely * call locking methods of mVirtualBox and parent from the * write lock (breaking the {parent,child} lock order) * because there may be no concurrent access to the just * opened hard disk on ther threads yet (and init() will * fail if this method reporst MediumState_Inaccessible) */ Guid id = parentId; ComObjPtr parent; rc = m->pVirtualBox->findHardDisk(&id, NULL, false /* aSetError */, &parent); if (FAILED(rc)) { lastAccessError = Utf8StrFmt( tr("Parent hard disk with UUID {%RTuuid} of the hard disk '%s' is not found in the media registry ('%s')"), &parentId, location.c_str(), m->pVirtualBox->settingsFilePath().c_str()); throw S_OK; } /* we set mParent & children() */ AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); Assert(m->pParent.isNull()); m->pParent = parent; m->pParent->m->llChildren.push_back(this); } else { /* we access mParent */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); /* check that parent UUIDs match. Note that there's no need * for the parent's AutoCaller (our lifetime is bound to * it) */ if (m->pParent.isNull()) { lastAccessError = Utf8StrFmt( tr("Hard disk '%s' is differencing but it is not associated with any parent hard disk in the media registry ('%s')"), location.c_str(), m->pVirtualBox->settingsFilePath().c_str()); throw S_OK; } AutoReadLock parentLock(m->pParent COMMA_LOCKVAL_SRC_POS); if ( m->pParent->getState() != MediumState_Inaccessible && m->pParent->getId() != parentId) { lastAccessError = Utf8StrFmt( tr("Parent UUID {%RTuuid} of the hard disk '%s' does not match UUID {%RTuuid} of its parent hard disk stored in the media registry ('%s')"), &parentId, location.c_str(), m->pParent->getId().raw(), m->pVirtualBox->settingsFilePath().c_str()); throw S_OK; } /// @todo NEWMEDIA what to do if the parent is not /// accessible while the diff is? Probably, nothing. The /// real code will detect the mismatch anyway. } } mediumSize = VDGetFileSize(hdd, 0); mediumLogicalSize = VDGetSize(hdd, 0) / _1M; success = true; } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } alock.enter(); if (isImport) unconst(m->id) = mediumId; if (success) { m->size = mediumSize; m->logicalSize = mediumLogicalSize; m->strLastAccessError.setNull(); } else { m->strLastAccessError = lastAccessError; LogWarningFunc(("'%s' is not accessible (error='%s', rc=%Rhrc, vrc=%Rrc)\n", location.c_str(), m->strLastAccessError.c_str(), rc, vrc)); } /* inform other callers if there are any */ RTSemEventMultiSignal(m->queryInfoSem); m->queryInfoRunning = false; /* Set the proper state according to the result of the check */ if (success) m->preLockState = MediumState_Created; else m->preLockState = MediumState_Inaccessible; if (flags & VD_OPEN_FLAGS_READONLY) rc = UnlockRead(NULL); else rc = UnlockWrite(NULL); if (FAILED(rc)) return rc; return rc; } /** * Sets the extended error info according to the current media state. * * @note Must be called from under this object's write or read lock. */ HRESULT Medium::setStateError() { HRESULT rc = E_FAIL; switch (m->state) { case MediumState_NotCreated: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Storage for the medium '%s' is not created"), m->strLocationFull.raw()); break; } case MediumState_Created: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Storage for the medium '%s' is already created"), m->strLocationFull.raw()); break; } case MediumState_LockedRead: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Medium '%s' is locked for reading by another task"), m->strLocationFull.raw()); break; } case MediumState_LockedWrite: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Medium '%s' is locked for writing by another task"), m->strLocationFull.raw()); break; } case MediumState_Inaccessible: { /* be in sync with Console::powerUpThread() */ if (!m->strLastAccessError.isEmpty()) rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Medium '%s' is not accessible. %s"), m->strLocationFull.raw(), m->strLastAccessError.c_str()); else rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Medium '%s' is not accessible"), m->strLocationFull.raw()); break; } case MediumState_Creating: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Storage for the medium '%s' is being created"), m->strLocationFull.raw()); break; } case MediumState_Deleting: { rc = setError(VBOX_E_INVALID_OBJECT_STATE, tr("Storage for the medium '%s' is being deleted"), m->strLocationFull.raw()); break; } default: { AssertFailed(); break; } } return rc; } /** * Deletes the hard disk storage unit. * * If @a aProgress is not NULL but the object it points to is @c null then a new * progress object will be created and assigned to @a *aProgress on success, * otherwise the existing progress object is used. If Progress is NULL, then no * progress object is created/used at all. * * When @a aWait is @c false, this method will create a thread to perform the * delete operation asynchronously and will return immediately. Otherwise, it * will perform the operation on the calling thread and will not return to the * caller until the operation is completed. Note that @a aProgress cannot be * NULL when @a aWait is @c false (this method will assert in this case). * * @param aProgress Where to find/store a Progress object to track operation * completion. * @param aWait @c true if this method should block instead of creating * an asynchronous thread. * @param pfNeedsSaveSettings Optional pointer to a bool that must have been initialized to false and that will be set to true * by this function if the caller should invoke VirtualBox::saveSettings() because the global settings have changed. * This only works in "wait" mode; otherwise saveSettings gets called automatically by the thread that was created, * and this parameter is ignored. * * @note Locks mVirtualBox and this object for writing. Locks getTreeLock() for * writing. */ HRESULT Medium::deleteStorage(ComObjPtr *aProgress, bool aWait, bool *pfNeedsSaveSettings) { AssertReturn(aProgress != NULL || aWait == true, E_FAIL); /* we're accessing the media tree, and canClose() needs the tree lock too */ AutoMultiWriteLock2 multilock(&m->pVirtualBox->getMediaTreeLockHandle(), this->lockHandle() COMMA_LOCKVAL_SRC_POS); LogFlowThisFunc(("aWait=%RTbool locationFull=%s\n", aWait, getLocationFull().c_str() )); if ( !(m->formatObj->capabilities() & ( MediumFormatCapabilities_CreateDynamic | MediumFormatCapabilities_CreateFixed))) return setError(VBOX_E_NOT_SUPPORTED, tr("Hard disk format '%s' does not support storage deletion"), m->strFormat.raw()); /* Note that we are fine with Inaccessible state too: a) for symmetry with * create calls and b) because it doesn't really harm to try, if it is * really inaccessible, the delete operation will fail anyway. Accepting * Inaccessible state is especially important because all registered hard * disks are initially Inaccessible upon VBoxSVC startup until * COMGETTER(State) is called. */ switch (m->state) { case MediumState_Created: case MediumState_Inaccessible: break; default: return setStateError(); } if (m->backRefs.size() != 0) { Utf8Str strMachines; for (BackRefList::const_iterator it = m->backRefs.begin(); it != m->backRefs.end(); ++it) { const BackRef &b = *it; if (strMachines.length()) strMachines.append(", "); strMachines.append(b.machineId.toString().c_str()); } #ifdef DEBUG dumpBackRefs(); #endif return setError(VBOX_E_OBJECT_IN_USE, tr("Cannot delete storage: hard disk '%s' is still attached to the following %d virtual machine(s): %s"), m->strLocationFull.c_str(), m->backRefs.size(), strMachines.c_str()); } HRESULT rc = canClose(); if (FAILED(rc)) return rc; /* go to Deleting state before leaving the lock */ m->state = MediumState_Deleting; /* try to remove from the list of known hard disks before performing actual * deletion (we favor the consistency of the media registry in the first * place which would have been broken if unregisterWithVirtualBox() failed * after we successfully deleted the storage) */ rc = unregisterWithVirtualBox(pfNeedsSaveSettings); /* restore the state because we may fail below; we will set it later again*/ m->state = MediumState_Created; if (FAILED(rc)) return rc; ComObjPtr progress; if (aProgress != NULL) { /* use the existing progress object... */ progress = *aProgress; /* ...but create a new one if it is null */ if (progress.isNull()) { progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast(this), BstrFmt(tr("Deleting hard disk storage unit '%s'"), m->strLocationFull.raw()), FALSE /* aCancelable */); if (FAILED(rc)) return rc; } } std::auto_ptr task(new Task(this, progress, Task::Delete)); AssertComRCReturnRC(task->m_autoCaller.rc()); if (aWait) { /* go to Deleting state before starting the task */ m->state = MediumState_Deleting; rc = task->runNow(NULL /* pfNeedsSaveSettings*/ ); // there is no save settings to do in taskThreadDelete() } else { rc = task->startThread(); if (FAILED(rc)) return rc; /* go to Deleting state before leaving the lock */ m->state = MediumState_Deleting; } /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); if (aProgress != NULL) { /* return progress to the caller */ *aProgress = progress; } return rc; } /** * Creates a new differencing storage unit using the given target hard disk's * format and the location. Note that @c aTarget must be NotCreated. * * As opposed to the CreateDiffStorage() method, this method doesn't try to lock * this hard disk for reading assuming that the caller has already done so. This * is used when taking an online snaopshot (where all original hard disks are * locked for writing and must remain such). Note however that if @a aWait is * @c false and this method returns a success then the thread started by * this method will unlock the hard disk (unless it is in * MediumState_LockedWrite state) so make sure the hard disk is either in * MediumState_LockedWrite or call #LockRead() before calling this method! If @a * aWait is @c true then this method neither locks nor unlocks the hard disk, so * make sure you do it yourself as needed. * * If @a aProgress is not NULL but the object it points to is @c null then a new * progress object will be created and assigned to @a *aProgress on success, * otherwise the existing progress object is used. If @a aProgress is NULL, then no * progress object is created/used at all. * * When @a aWait is @c false, this method will create a thread to perform the * create operation asynchronously and will return immediately. Otherwise, it * will perform the operation on the calling thread and will not return to the * caller until the operation is completed. Note that @a aProgress cannot be * NULL when @a aWait is @c false (this method will assert in this case). * * @param aTarget Target hard disk. * @param aVariant Precise image variant to create. * @param aProgress Where to find/store a Progress object to track operation * completion. * @param aWait @c true if this method should block instead of creating * an asynchronous thread. * @param pfNeedsSaveSettings Optional pointer to a bool that must have been initialized to false and that will be set to true * by this function if the caller should invoke VirtualBox::saveSettings() because the global settings have changed. * This only works in "wait" mode; otherwise saveSettings gets called automatically by the thread that was created, * and this parameter is ignored. * * @note Locks this object and @a aTarget for writing. */ HRESULT Medium::createDiffStorage(ComObjPtr &aTarget, MediumVariant_T aVariant, ComObjPtr *aProgress, bool aWait, bool *pfNeedsSaveSettings) { AssertReturn(!aTarget.isNull(), E_FAIL); AssertReturn(aProgress != NULL || aWait == true, E_FAIL); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); AutoCaller targetCaller(aTarget); if (FAILED(targetCaller.rc())) return targetCaller.rc(); AutoMultiWriteLock2 alock(this, aTarget COMMA_LOCKVAL_SRC_POS); AssertReturn(m->type != MediumType_Writethrough, E_FAIL); /* Note: MediumState_LockedWrite is ok when taking an online snapshot */ AssertReturn( m->state == MediumState_LockedRead || m->state == MediumState_LockedWrite, E_FAIL); if (aTarget->m->state != MediumState_NotCreated) return aTarget->setStateError(); HRESULT rc = S_OK; /* check that the hard disk is not attached to any VM in the current state*/ for (BackRefList::const_iterator it = m->backRefs.begin(); it != m->backRefs.end(); ++it) { if (it->fInCurState) { /* Note: when a VM snapshot is being taken, all normal hard disks * attached to the VM in the current state will be, as an exception, * also associated with the snapshot which is about to create (see * SnapshotMachine::init()) before deassociating them from the * current state (which takes place only on success in * Machine::fixupHardDisks()), so that the size of snapshotIds * will be 1 in this case. The given condition is used to filter out * this legal situatinon and do not report an error. */ if (it->llSnapshotIds.size() == 0) return setError(VBOX_E_INVALID_OBJECT_STATE, tr("Hard disk '%s' is attached to a virtual machine with UUID {%RTuuid}. No differencing hard disks based on it may be created until it is detached"), m->strLocationFull.raw(), it->machineId.raw()); Assert(it->llSnapshotIds.size() == 1); } } ComObjPtr progress; if (aProgress != NULL) { /* use the existing progress object... */ progress = *aProgress; /* ...but create a new one if it is null */ if (progress.isNull()) { progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast(this), BstrFmt(tr("Creating differencing hard disk storage unit '%s'"), aTarget->m->strLocationFull.raw()), TRUE /* aCancelable */); if (FAILED(rc)) return rc; } } /* set up task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::CreateDiff)); AssertComRCReturnRC(task->m_autoCaller.rc()); task->setData(aTarget); task->d.variant = aVariant; /* register a task (it will deregister itself when done) */ ++m->numCreateDiffTasks; Assert(m->numCreateDiffTasks != 0); /* overflow? */ if (aWait) { // go to Creating state before starting the task aTarget->m->state = MediumState_Creating; // release the locks because the task function will acquire other locks; // this is safe because both this and the target are not protected by // their states; we have asserted above that *this* is locked read or write! alock.release(); rc = task->runNow(pfNeedsSaveSettings); } else { rc = task->startThread(); if (FAILED(rc)) return rc; /* go to Creating state before leaving the lock */ aTarget->m->state = MediumState_Creating; } /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); if (aProgress != NULL) { /* return progress to the caller */ *aProgress = progress; } return rc; } /** * Prepares this (source) hard disk, target hard disk and all intermediate hard * disks for the merge operation. * * This method is to be called prior to calling the #mergeTo() to perform * necessary consistency checks and place involved hard disks to appropriate * states. If #mergeTo() is not called or fails, the state modifications * performed by this method must be undone by #cancelMergeTo(). * * Note that when @a aIgnoreAttachments is @c true then it's the caller's * responsibility to detach the source and all intermediate hard disks before * calling #mergeTo() (which will fail otherwise). * * See #mergeTo() for more information about merging. * * @param aTarget Target hard disk. * @param aChain Where to store the created merge chain. * @param aIgnoreAttachments Don't check if the source or any intermediate * hard disk is attached to any VM. * * @note Locks getTreeLock() for reading. Locks this object, aTarget and all * intermediate hard disks for writing. */ HRESULT Medium::prepareMergeTo(Medium *aTarget, MergeChain * &aChain, bool aIgnoreAttachments /*= false*/) { AssertReturn(aTarget != NULL, E_FAIL); AutoCaller autoCaller(this); AssertComRCReturnRC(autoCaller.rc()); AutoCaller targetCaller(aTarget); AssertComRCReturnRC(targetCaller.rc()); aChain = NULL; /* we walk the tree */ AutoReadLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); HRESULT rc = S_OK; /* detect the merge direction */ bool forward; { Medium *parent = m->pParent; while (parent != NULL && parent != aTarget) parent = parent->m->pParent; if (parent == aTarget) forward = false; else { parent = aTarget->m->pParent; while (parent != NULL && parent != this) parent = parent->m->pParent; if (parent == this) forward = true; else { Utf8Str tgtLoc; { AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); tgtLoc = aTarget->getLocationFull(); } AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); return setError(E_FAIL, tr("Hard disks '%s' and '%s' are unrelated"), m->strLocationFull.raw(), tgtLoc.raw()); } } } /* build the chain (will do necessary checks and state changes) */ std::auto_ptr chain(new MergeChain(forward, aIgnoreAttachments)); { Medium *last = forward ? aTarget : this; Medium *first = forward ? this : aTarget; for (;;) { if (last == aTarget) rc = chain->addTarget(last); else if (last == this) rc = chain->addSource(last); else rc = chain->addIntermediate(last); if (FAILED(rc)) return rc; if (last == first) break; last = last->m->pParent; } } aChain = chain.release(); return S_OK; } /** * Merges this hard disk to the specified hard disk which must be either its * direct ancestor or descendant. * * Given this hard disk is SOURCE and the specified hard disk is TARGET, we will * get two varians of the merge operation: * * forward merge * -------------------------> * [Extra] <- SOURCE <- Intermediate <- TARGET * Any Del Del LockWr * * * backward merge * <------------------------- * TARGET <- Intermediate <- SOURCE <- [Extra] * LockWr Del Del LockWr * * Each scheme shows the involved hard disks on the hard disk chain where * SOURCE and TARGET belong. Under each hard disk there is a state value which * the hard disk must have at a time of the mergeTo() call. * * The hard disks in the square braces may be absent (e.g. when the forward * operation takes place and SOURCE is the base hard disk, or when the backward * merge operation takes place and TARGET is the last child in the chain) but if * they present they are involved too as shown. * * Nor the source hard disk neither intermediate hard disks may be attached to * any VM directly or in the snapshot, otherwise this method will assert. * * The #prepareMergeTo() method must be called prior to this method to place all * involved to necessary states and perform other consistency checks. * * If @a aWait is @c true then this method will perform the operation on the * calling thread and will not return to the caller until the operation is * completed. When this method succeeds, all intermediate hard disk objects in * the chain will be uninitialized, the state of the target hard disk (and all * involved extra hard disks) will be restored and @a aChain will be deleted. * Note that this (source) hard disk is not uninitialized because of possible * AutoCaller instances held by the caller of this method on the current thread. * It's therefore the responsibility of the caller to call Medium::uninit() * after releasing all callers in this case! * * If @a aWait is @c false then this method will crea,te a thread to perform the * create operation asynchronously and will return immediately. If the operation * succeeds, the thread will uninitialize the source hard disk object and all * intermediate hard disk objects in the chain, reset the state of the target * hard disk (and all involved extra hard disks) and delete @a aChain. If the * operation fails, the thread will only reset the states of all involved hard * disks and delete @a aChain. * * When this method fails (regardless of the @a aWait mode), it is a caller's * responsiblity to undo state changes and delete @a aChain using * #cancelMergeTo(). * * If @a aProgress is not NULL but the object it points to is @c null then a new * progress object will be created and assigned to @a *aProgress on success, * otherwise the existing progress object is used. If Progress is NULL, then no * progress object is created/used at all. Note that @a aProgress cannot be * NULL when @a aWait is @c false (this method will assert in this case). * * @param aChain Merge chain created by #prepareMergeTo(). * @param aProgress Where to find/store a Progress object to track operation * completion. * @param aWait @c true if this method should block instead of creating * an asynchronous thread. * @param pfNeedsSaveSettings Optional pointer to a bool that must have been initialized to false and that will be set to true * by this function if the caller should invoke VirtualBox::saveSettings() because the global settings have changed. * This only works in "wait" mode; otherwise saveSettings gets called automatically by the thread that was created, * and this parameter is ignored. * * @note Locks the branch lock for writing. Locks the hard disks from the chain * for writing. */ HRESULT Medium::mergeTo(MergeChain *aChain, ComObjPtr *aProgress, bool aWait, bool *pfNeedsSaveSettings) { AssertReturn(aChain != NULL, E_FAIL); AssertReturn(aProgress != NULL || aWait == true, E_FAIL); AutoCaller autoCaller(this); if (FAILED(autoCaller.rc())) return autoCaller.rc(); HRESULT rc = S_OK; ComObjPtr progress; if (aProgress != NULL) { /* use the existing progress object... */ progress = *aProgress; /* ...but create a new one if it is null */ if (progress.isNull()) { AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS); progress.createObject(); rc = progress->init(m->pVirtualBox, static_cast(this), BstrFmt(tr("Merging hard disk '%s' to '%s'"), getName().raw(), aChain->target()->getName().raw()), TRUE /* aCancelable */); if (FAILED(rc)) return rc; } } /* setup task object and thread to carry out the operation * asynchronously */ std::auto_ptr task(new Task(this, progress, Task::Merge)); AssertComRCReturnRC(task->m_autoCaller.rc()); task->setData(aChain); /* Note: task owns aChain (will delete it when not needed) in all cases * except when @a aWait is @c true and runNow() fails -- in this case * aChain will be left away because cancelMergeTo() will be applied by the * caller on it as it is required in the documentation above */ if (aWait) { rc = task->runNow(pfNeedsSaveSettings); } else { rc = task->startThread(); if (FAILED(rc)) return rc; } /* task is now owned (or already deleted) by taskThread() so release it */ task.release(); if (aProgress != NULL) { /* return progress to the caller */ *aProgress = progress; } return rc; } /** * Undoes what #prepareMergeTo() did. Must be called if #mergeTo() is not called * or fails. Frees memory occupied by @a aChain. * * @param aChain Merge chain created by #prepareMergeTo(). * * @note Locks the hard disks from the chain for writing. */ void Medium::cancelMergeTo(MergeChain *aChain) { AutoCaller autoCaller(this); AssertComRCReturnVoid(autoCaller.rc()); AssertReturnVoid(aChain != NULL); /* the destructor will do the thing */ delete aChain; } /** * Checks that the format ID is valid and sets it on success. * * Note that this method will caller-reference the format object on success! * This reference must be released somewhere to let the MediumFormat object be * uninitialized. * * @note Must be called from under this object's write lock. */ HRESULT Medium::setFormat(CBSTR aFormat) { /* get the format object first */ { AutoReadLock propsLock(m->pVirtualBox->systemProperties() COMMA_LOCKVAL_SRC_POS); unconst(m->formatObj) = m->pVirtualBox->systemProperties()->mediumFormat(aFormat); if (m->formatObj.isNull()) return setError(E_INVALIDARG, tr("Invalid hard disk storage format '%ls'"), aFormat); /* reference the format permanently to prevent its unexpected * uninitialization */ HRESULT rc = m->formatObj->addCaller(); AssertComRCReturnRC(rc); /* get properties (preinsert them as keys in the map). Note that the * map doesn't grow over the object life time since the set of * properties is meant to be constant. */ Assert(m->properties.empty()); for (MediumFormat::PropertyList::const_iterator it = m->formatObj->properties().begin(); it != m->formatObj->properties().end(); ++ it) { m->properties.insert(std::make_pair(it->name, Bstr::Null)); } } unconst(m->strFormat) = aFormat; return S_OK; } /** * @note Called from this object's AutoMayUninitSpan and from under mVirtualBox * write lock. * * @note Also reused by Medium::Reset(). * * @note Caller must hold the media tree write lock! */ HRESULT Medium::canClose() { Assert(m->pVirtualBox->getMediaTreeLockHandle().isWriteLockOnCurrentThread()); if (getChildren().size() != 0) return setError(E_FAIL, tr("Cannot close medium '%s' because it has %d child hard disk(s)"), m->strLocationFull.raw(), getChildren().size()); return S_OK; } /** * Calls either VirtualBox::unregisterImage or VirtualBox::unregisterHardDisk depending * on the device type of this medium. * * @param pfNeedsSaveSettings Optional pointer to a bool that must have been initialized to false and that will be set to true * by this function if the caller should invoke VirtualBox::saveSettings() because the global settings have changed. * * @note Called from within this object's AutoMayUninitSpan (or AutoCaller) and * from under mVirtualBox write lock. * * @note Caller must have locked the media tree lock for writing! */ HRESULT Medium::unregisterWithVirtualBox(bool *pfNeedsSaveSettings) { /* Note that we need to de-associate ourselves from the parent to let * unregisterHardDisk() properly save the registry */ /* we modify mParent and access children */ Assert(m->pVirtualBox->getMediaTreeLockHandle().isWriteLockOnCurrentThread()); Medium *pParentBackup = m->pParent; AssertReturn(getChildren().size() == 0, E_FAIL); if (m->pParent) deparent(); HRESULT rc = E_FAIL; switch (m->devType) { case DeviceType_DVD: rc = m->pVirtualBox->unregisterImage(this, DeviceType_DVD, pfNeedsSaveSettings); break; case DeviceType_Floppy: rc = m->pVirtualBox->unregisterImage(this, DeviceType_Floppy, pfNeedsSaveSettings); break; case DeviceType_HardDisk: rc = m->pVirtualBox->unregisterHardDisk(this, pfNeedsSaveSettings); break; default: break; } if (FAILED(rc)) { if (pParentBackup) { /* re-associate with the parent as we are still relatives in the * registry */ m->pParent = pParentBackup; m->pParent->m->llChildren.push_back(this); } } return rc; } /** * Returns the last error message collected by the vdErrorCall callback and * resets it. * * The error message is returned prepended with a dot and a space, like this: * * ". (%Rrc)" * * to make it easily appendable to a more general error message. The @c %Rrc * format string is given @a aVRC as an argument. * * If there is no last error message collected by vdErrorCall or if it is a * null or empty string, then this function returns the following text: * * " (%Rrc)" * * * @note Doesn't do any object locking; it is assumed that the caller makes sure * the callback isn't called by more than one thread at a time. * * @param aVRC VBox error code to use when no error message is provided. */ Utf8Str Medium::vdError(int aVRC) { Utf8Str error; if (m->vdError.isEmpty()) error = Utf8StrFmt(" (%Rrc)", aVRC); else error = Utf8StrFmt(".\n%s", m->vdError.raw()); m->vdError.setNull(); return error; } /** * Error message callback. * * Puts the reported error message to the m->vdError field. * * @note Doesn't do any object locking; it is assumed that the caller makes sure * the callback isn't called by more than one thread at a time. * * @param pvUser The opaque data passed on container creation. * @param rc The VBox error code. * @param RT_SRC_POS_DECL Use RT_SRC_POS. * @param pszFormat Error message format string. * @param va Error message arguments. */ /*static*/ DECLCALLBACK(void) Medium::vdErrorCall(void *pvUser, int rc, RT_SRC_POS_DECL, const char *pszFormat, va_list va) { NOREF(pszFile); NOREF(iLine); NOREF(pszFunction); /* RT_SRC_POS_DECL */ Medium *that = static_cast(pvUser); AssertReturnVoid(that != NULL); if (that->m->vdError.isEmpty()) that->m->vdError = Utf8StrFmt("%s (%Rrc)", Utf8StrFmtVA(pszFormat, va).raw(), rc); else that->m->vdError = Utf8StrFmt("%s.\n%s (%Rrc)", that->m->vdError.raw(), Utf8StrFmtVA(pszFormat, va).raw(), rc); } /** * PFNVMPROGRESS callback handler for Task operations. * * @param uPercent Completetion precentage (0-100). * @param pvUser Pointer to the Progress instance. */ /*static*/ DECLCALLBACK(int) Medium::vdProgressCall(PVM /* pVM */, unsigned uPercent, void *pvUser) { Progress *that = static_cast(pvUser); if (that != NULL) { /* update the progress object, capping it at 99% as the final percent * is used for additional operations like setting the UUIDs and similar. */ HRESULT rc = that->SetCurrentOperationProgress(uPercent * 99 / 100); if (FAILED(rc)) { if (rc == E_FAIL) return VERR_CANCELLED; else return VERR_INVALID_STATE; } } return VINF_SUCCESS; } /* static */ DECLCALLBACK(bool) Medium::vdConfigAreKeysValid(void *pvUser, const char * /* pszzValid */) { Medium *that = static_cast(pvUser); AssertReturn(that != NULL, false); /* we always return true since the only keys we have are those found in * VDBACKENDINFO */ return true; } /* static */ DECLCALLBACK(int) Medium::vdConfigQuerySize(void *pvUser, const char *pszName, size_t *pcbValue) { AssertReturn(VALID_PTR(pcbValue), VERR_INVALID_POINTER); Medium *that = static_cast(pvUser); AssertReturn(that != NULL, VERR_GENERAL_FAILURE); Data::PropertyMap::const_iterator it = that->m->properties.find(Bstr(pszName)); if (it == that->m->properties.end()) return VERR_CFGM_VALUE_NOT_FOUND; /* we interpret null values as "no value" in Medium */ if (it->second.isNull()) return VERR_CFGM_VALUE_NOT_FOUND; *pcbValue = it->second.length() + 1 /* include terminator */; return VINF_SUCCESS; } /* static */ DECLCALLBACK(int) Medium::vdConfigQuery(void *pvUser, const char *pszName, char *pszValue, size_t cchValue) { AssertReturn(VALID_PTR(pszValue), VERR_INVALID_POINTER); Medium *that = static_cast(pvUser); AssertReturn(that != NULL, VERR_GENERAL_FAILURE); Data::PropertyMap::const_iterator it = that->m->properties.find(Bstr(pszName)); if (it == that->m->properties.end()) return VERR_CFGM_VALUE_NOT_FOUND; Utf8Str value = it->second; if (value.length() >= cchValue) return VERR_CFGM_NOT_ENOUGH_SPACE; /* we interpret null values as "no value" in Medium */ if (it->second.isNull()) return VERR_CFGM_VALUE_NOT_FOUND; memcpy(pszValue, value.c_str(), value.length() + 1); return VINF_SUCCESS; } /** * Implementation code called from Medium::taskThread for the "create base" task. * * This only gets started from Medium::CreateBaseStorage() and always runs * asynchronously. As a result, we always save the VirtualBox.xml file when we're * done here. * * @param task * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadCreateBase(Task &task, void *pvdOperationIfaces) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; /* these parameters we need after creation */ uint64_t size = 0, logicalSize = 0; bool fGenerateUuid = false; try { /* The lock is also used as a signal from the task initiator (which * releases it only after RTThreadCreate()) that we can start the job */ AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); /* The object may request a specific UUID (through a special form of * the setLocation() argument). Otherwise we have to generate it */ Guid id = m->id; fGenerateUuid = id.isEmpty(); if (fGenerateUuid) { id.create(); /* VirtualBox::registerHardDisk() will need UUID */ unconst(m->id) = id; } PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); Utf8Str format(m->strFormat); Utf8Str location(m->strLocationFull); /* uint64_t capabilities = */ m->formatObj->capabilities(); /* unlock before the potentially lengthy operation */ Assert(m->state == MediumState_Creating); thisLock.leave(); try { /* ensure the directory exists */ rc = VirtualBox::ensureFilePathExists(location); if (FAILED(rc)) throw rc; PDMMEDIAGEOMETRY geo = { 0 }; /* auto-detect */ vrc = VDCreateBase(hdd, format.c_str(), location.c_str(), task.d.size * _1M, task.d.variant, NULL, &geo, &geo, id.raw(), VD_OPEN_FLAGS_NORMAL, NULL, vdOperationIfaces); if (RT_FAILURE(vrc)) { throw setError(E_FAIL, tr("Could not create the hard disk storage unit '%s'%s"), location.raw(), vdError(vrc).raw()); } size = VDGetFileSize(hdd, 0); logicalSize = VDGetSize(hdd, 0) / _1M; } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } if (SUCCEEDED(rc)) { /* register with mVirtualBox as the last step and move to * Created state only on success (leaving an orphan file is * better than breaking media registry consistency) */ bool fNeedsSaveSettings = false; AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); rc = m->pVirtualBox->registerHardDisk(this, &fNeedsSaveSettings); treeLock.release(); if (fNeedsSaveSettings) { AutoWriteLock vboxlock(m->pVirtualBox COMMA_LOCKVAL_SRC_POS); m->pVirtualBox->saveSettings(); } } // reenter the lock before changing state AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); if (SUCCEEDED(rc)) { m->state = MediumState_Created; m->size = size; m->logicalSize = logicalSize; } else { /* back to NotCreated on failure */ m->state = MediumState_NotCreated; /* reset UUID to prevent it from being reused next time */ if (fGenerateUuid) unconst(m->id).clear(); } return rc; } /** * Implementation code called from Medium::taskThread for the "create diff" task. * * This task always gets started from Medium::createDiffStorage() and can run * synchronously or asynchrously depending on the "wait" parameter passed to that * function. If we run synchronously, the caller expects the bool *pfNeedsSaveSettings * to be set before returning; otherwise (in asynchronous mode), we save the settings * ourselves. * * @param task * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadCreateDiff(Task &task, void *pvdOperationIfaces, bool fIsAsync) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; bool fNeedsSaveSettings = false; ComObjPtr &pTarget = task.d.target; uint64_t size = 0, logicalSize = 0; bool fGenerateUuid = false; try { /* Lock both in {parent,child} order. The lock is also used as a * signal from the task initiator (which releases it only after * RTThreadCreate()) that we can start the job*/ AutoMultiWriteLock2 mediaLock(this, pTarget COMMA_LOCKVAL_SRC_POS); /* The object may request a specific UUID (through a special form of * the setLocation() argument). Otherwise we have to generate it */ Guid targetId = pTarget->m->id; fGenerateUuid = targetId.isEmpty(); if (fGenerateUuid) { targetId.create(); /* VirtualBox::registerHardDisk() will need UUID */ unconst(pTarget->m->id) = targetId; } PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); Guid id = m->id; Utf8Str format(m->strFormat); Utf8Str location(m->strLocationFull); Utf8Str targetFormat(pTarget->m->strFormat); Utf8Str targetLocation(pTarget->m->strLocationFull); Assert(pTarget->m->state == MediumState_Creating); /* Note: MediumState_LockedWrite is ok when taking an online * snapshot */ Assert( m->state == MediumState_LockedRead || m->state == MediumState_LockedWrite); /* the two media are now protected by their non-default states; unlock the media before the potentially lengthy operation */ mediaLock.leave(); try { vrc = VDOpen(hdd, format.c_str(), location.c_str(), VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO, m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not open the hard disk storage unit '%s'%s"), location.raw(), vdError(vrc).raw()); /* ensure the target directory exists */ rc = VirtualBox::ensureFilePathExists(targetLocation); if (FAILED(rc)) throw rc; /** @todo add VD_IMAGE_FLAGS_DIFF to the image flags, to * be on the safe side. */ vrc = VDCreateDiff(hdd, targetFormat.c_str(), targetLocation.c_str(), task.d.variant, NULL, targetId.raw(), id.raw(), VD_OPEN_FLAGS_NORMAL, pTarget->m->vdDiskIfaces, vdOperationIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not create the differencing hard disk storage unit '%s'%s"), targetLocation.raw(), vdError(vrc).raw()); size = VDGetFileSize(hdd, 1); logicalSize = VDGetSize(hdd, 1) / _1M; } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } if (SUCCEEDED(rc)) { AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); Assert(pTarget->m->pParent.isNull()); /* associate the child with the parent */ pTarget->m->pParent = this; m->llChildren.push_back(pTarget); /** @todo r=klaus neither target nor base() are locked, * potential race! */ /* diffs for immutable hard disks are auto-reset by default */ pTarget->m->autoReset = getBase()->m->type == MediumType_Immutable ? TRUE : FALSE; /* register with mVirtualBox as the last step and move to * Created state only on success (leaving an orphan file is * better than breaking media registry consistency) */ rc = m->pVirtualBox->registerHardDisk(pTarget, &fNeedsSaveSettings); if (FAILED(rc)) /* break the parent association on failure to register */ deparent(); } AutoMultiWriteLock2 mediaLock(this, pTarget COMMA_LOCKVAL_SRC_POS); if (SUCCEEDED(rc)) { pTarget->m->state = MediumState_Created; pTarget->m->size = size; pTarget->m->logicalSize = logicalSize; } else { /* back to NotCreated on failure */ pTarget->m->state = MediumState_NotCreated; pTarget->m->autoReset = FALSE; /* reset UUID to prevent it from being reused next time */ if (fGenerateUuid) unconst(pTarget->m->id).clear(); } if (fIsAsync) { /* unlock ourselves when done (unless in MediumState_LockedWrite * state because of taking the online snapshot*/ if (m->state != MediumState_LockedWrite) { HRESULT rc2 = UnlockRead(NULL); AssertComRC(rc2); } if (fNeedsSaveSettings) { mediaLock.leave(); AutoWriteLock vboxlock(m->pVirtualBox COMMA_LOCKVAL_SRC_POS); m->pVirtualBox->saveSettings(); } } else // synchronous mode: report save settings result to caller if (task.m_pfNeedsSaveSettings) *task.m_pfNeedsSaveSettings = fNeedsSaveSettings; /* deregister the task registered in createDiffStorage() */ Assert(m->numCreateDiffTasks != 0); --m->numCreateDiffTasks; /* Note that in sync mode, it's the caller's responsibility to * unlock the hard disk */ return rc; } /** * Implementation code called from Medium::taskThread for the "merge" task. * * This task always gets started from Medium::mergeTo() and can run * synchronously or asynchrously depending on the "wait" parameter passed to that * function. If we run synchronously, the caller expects the bool *pfNeedsSaveSettings * to be set before returning; otherwise (in asynchronous mode), we save the settings * ourselves. * * @param task * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadMerge(Task &task, void *pvdOperationIfaces, bool fIsAsync) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; /* The lock is also used as a signal from the task initiator (which * releases it only after RTThreadCreate()) that we can start the * job. We don't actually need the lock for anything else since the * object is protected by MediumState_Deleting and we don't modify * its sensitive fields below */ { AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); } MergeChain *chain = task.d.chain.get(); try { PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); try { /* Open all hard disks in the chain (they are in the * {parent,child} order in there. Note that we don't lock * objects in this chain since they must be in states * (Deleting and LockedWrite) that prevent from changing * their format and location fields from outside. */ for (MergeChain::const_iterator it = chain->begin(); it != chain->end(); ++it) { /* complex sanity (sane complexity) */ Assert((chain->isForward() && ((*it != chain->back() && (*it)->m->state == MediumState_Deleting) || (*it == chain->back() && (*it)->m->state == MediumState_LockedWrite))) || (!chain->isForward() && ((*it != chain->front() && (*it)->m->state == MediumState_Deleting) || (*it == chain->front() && (*it)->m->state == MediumState_LockedWrite)))); Assert(*it == chain->target() || (*it)->m->backRefs.size() == 0); /* open the first image with VDOPEN_FLAGS_INFO because * it's not necessarily the base one */ vrc = VDOpen(hdd, (*it)->m->strFormat.c_str(), (*it)->m->strLocationFull.c_str(), it == chain->begin() ? VD_OPEN_FLAGS_INFO : 0, (*it)->m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw vrc; } unsigned start = chain->isForward() ? 0 : (unsigned)chain->size() - 1; unsigned end = chain->isForward() ? (unsigned)chain->size() - 1 : 0; vrc = VDMerge(hdd, start, end, vdOperationIfaces); if (RT_FAILURE(vrc)) throw vrc; /* update parent UUIDs */ /// @todo VDMerge should be taught to do so, including the /// multiple children case if (chain->isForward()) { /* target's UUID needs to be updated (note that target * is the only image in the container on success) */ vrc = VDSetParentUuid(hdd, 0, chain->parent()->m->id); if (RT_FAILURE(vrc)) throw vrc; } else { /* we need to update UUIDs of all source's children * which cannot be part of the container at once so * add each one in there individually */ if (chain->children().size() > 0) { for (MediaList::const_iterator it = chain->children().begin(); it != chain->children().end(); ++it) { /* VD_OPEN_FLAGS_INFO since UUID is wrong yet */ vrc = VDOpen(hdd, (*it)->m->strFormat.c_str(), (*it)->m->strLocationFull.c_str(), VD_OPEN_FLAGS_INFO, (*it)->m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw vrc; vrc = VDSetParentUuid(hdd, 1, chain->target()->m->id); if (RT_FAILURE(vrc)) throw vrc; vrc = VDClose(hdd, false /* fDelete */); if (RT_FAILURE(vrc)) throw vrc; } } } } catch (HRESULT aRC) { rc = aRC; } catch (int aVRC) { throw setError(E_FAIL, tr("Could not merge the hard disk '%s' to '%s'%s"), chain->source()->m->strLocationFull.raw(), chain->target()->m->strLocationFull.raw(), vdError(aVRC).raw()); } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } HRESULT rc2; if (SUCCEEDED(rc)) { /* all hard disks but the target were successfully deleted by * VDMerge; reparent the last one and uninitialize deleted */ AutoWriteLock treeLock(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); Medium *pSource = chain->source(); Medium *pTarget = chain->target(); if (chain->isForward()) { /* first, unregister the target since it may become a base * hard disk which needs re-registration */ rc2 = m->pVirtualBox->unregisterHardDisk(pTarget, NULL /*&fNeedsSaveSettings*/); AssertComRC(rc2); /* then, reparent it and disconnect the deleted branch at * both ends (chain->parent() is source's parent) */ pTarget->deparent(); pTarget->m->pParent = chain->parent(); if (pTarget->m->pParent) { pTarget->m->pParent->m->llChildren.push_back(pTarget); pSource->deparent(); } /* then, register again */ rc2 = m->pVirtualBox->registerHardDisk(pTarget, NULL /*&fNeedsSaveSettings*/); AssertComRC(rc2); } else { Assert(pTarget->getChildren().size() == 1); Medium *targetChild = pTarget->getChildren().front(); /* disconnect the deleted branch at the elder end */ targetChild->deparent(); const MediaList &children = chain->children(); /* reparent source's chidren and disconnect the deleted * branch at the younger end m*/ if (children.size() > 0) { /* obey {parent,child} lock order */ AutoWriteLock sourceLock(pSource COMMA_LOCKVAL_SRC_POS); for (MediaList::const_iterator it = children.begin(); it != children.end(); ++it) { AutoWriteLock childLock(*it COMMA_LOCKVAL_SRC_POS); Medium *p = *it; p->deparent(); // removes p from source pTarget->m->llChildren.push_back(p); p->m->pParent = pTarget; } } } /* unregister and uninitialize all hard disks in the chain but the target */ for (MergeChain::iterator it = chain->begin(); it != chain->end(); ) { if (*it == chain->target()) { ++it; continue; } rc2 = (*it)->m->pVirtualBox->unregisterHardDisk(*it, NULL /*pfNeedsSaveSettings*/); AssertComRC(rc2); /* now, uninitialize the deleted hard disk (note that * due to the Deleting state, uninit() will not touch * the parent-child relationship so we need to * uninitialize each disk individually) */ /* note that the operation initiator hard disk (which is * normally also the source hard disk) is a special case * -- there is one more caller added by Task to it which * we must release. Also, if we are in sync mode, the * caller may still hold an AutoCaller instance for it * and therefore we cannot uninit() it (it's therefore * the caller's responsibility) */ if (*it == this) task.m_autoCaller.release(); /* release the caller added by MergeChain before uninit() */ (*it)->releaseCaller(); if (fIsAsync || *it != this) (*it)->uninit(); /* delete (to prevent uninitialization in MergeChain * dtor) and advance to the next item */ it = chain->erase(it); } } if (fIsAsync) { // in asynchronous mode, save settings now AutoWriteLock vboxlock(m->pVirtualBox COMMA_LOCKVAL_SRC_POS); m->pVirtualBox->saveSettings(); } else // synchronous mode: report save settings result to caller if (task.m_pfNeedsSaveSettings) *task.m_pfNeedsSaveSettings = true; if (FAILED(rc)) { /* Here we come if either VDMerge() failed (in which case we * assume that it tried to do everything to make a further * retry possible -- e.g. not deleted intermediate hard disks * and so on) or VirtualBox::saveSettings() failed (where we * should have the original tree but with intermediate storage * units deleted by VDMerge()). We have to only restore states * (through the MergeChain dtor) unless we are run synchronously * in which case it's the responsibility of the caller as stated * in the mergeTo() docs. The latter also implies that we * don't own the merge chain, so release it in this case. */ if (!fIsAsync) task.d.chain.release(); } return rc; } /** * Implementation code called from Medium::taskThread for the "clone" task. * This only gets started from Medium::CloneTo() and always runs asynchronously. * As a result, we always save the VirtualBox.xml file when we're done here. * * @param task * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadClone(Task &task, void *pvdOperationIfaces) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; ComObjPtr &pTarget = task.d.target; ComObjPtr &pParent = task.d.parentDisk; bool fCreatingTarget; uint64_t size = 0, logicalSize = 0; bool fGenerateUuid = false; try { /* Lock all in {parent,child} order. The lock is also used as a * signal from the task initiator (which releases it only after * RTThreadCreate()) that we can start the job. */ AutoMultiWriteLock3 thisLock(this, pTarget, pParent COMMA_LOCKVAL_SRC_POS); fCreatingTarget = pTarget->m->state == MediumState_Creating; ImageChain *srcChain = task.d.source.get(); ImageChain *parentChain = task.d.parent.get(); /* The object may request a specific UUID (through a special form of * the setLocation() argument). Otherwise we have to generate it */ Guid targetId = pTarget->m->id; fGenerateUuid = targetId.isEmpty(); if (fGenerateUuid) { targetId.create(); /* VirtualBox::registerHardDisk() will need UUID */ unconst(pTarget->m->id) = targetId; } PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); try { /* Open all hard disk images in the source chain. */ for (MediaList::const_iterator it = srcChain->begin(); it != srcChain->end(); ++it) { /* sanity check */ Assert((*it)->m->state == MediumState_LockedRead); /** Open all images in read-only mode. */ vrc = VDOpen(hdd, (*it)->m->strFormat.c_str(), (*it)->m->strLocationFull.c_str(), VD_OPEN_FLAGS_READONLY, (*it)->m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not open the hard disk storage unit '%s'%s"), (*it)->m->strLocationFull.raw(), vdError(vrc).raw()); } Utf8Str targetFormat(pTarget->m->strFormat); Utf8Str targetLocation(pTarget->m->strLocationFull); Assert( pTarget->m->state == MediumState_Creating || pTarget->m->state == MediumState_LockedWrite); Assert(m->state == MediumState_LockedRead); Assert(pParent.isNull() || pParent->m->state == MediumState_LockedRead); /* unlock before the potentially lengthy operation */ thisLock.leave(); /* ensure the target directory exists */ rc = VirtualBox::ensureFilePathExists(targetLocation); if (FAILED(rc)) throw rc; PVBOXHDD targetHdd; vrc = VDCreate(m->vdDiskIfaces, &targetHdd); ComAssertRCThrow(vrc, E_FAIL); try { /* Open all hard disk images in the parent chain. */ for (MediaList::const_iterator it = parentChain->begin(); it != parentChain->end(); ++it) { /** @todo r=klaus (*it) is not locked, lots of * race opportunities below */ /* sanity check */ Assert( (*it)->m->state == MediumState_LockedRead || (*it)->m->state == MediumState_LockedWrite); /* Open all images in appropriate mode. */ vrc = VDOpen(targetHdd, (*it)->m->strFormat.c_str(), (*it)->m->strLocationFull.c_str(), ((*it)->m->state == MediumState_LockedWrite) ? VD_OPEN_FLAGS_NORMAL : VD_OPEN_FLAGS_READONLY, (*it)->m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not open the hard disk storage unit '%s'%s"), (*it)->m->strLocationFull.raw(), vdError(vrc).raw()); } /** @todo r=klaus target isn't locked, race getting the state */ vrc = VDCopy(hdd, VD_LAST_IMAGE, targetHdd, targetFormat.c_str(), (fCreatingTarget) ? targetLocation.raw() : (char *)NULL, false, 0, task.d.variant, targetId.raw(), NULL, pTarget->m->vdDiskIfaces, vdOperationIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not create the clone hard disk '%s'%s"), targetLocation.raw(), vdError(vrc).raw()); size = VDGetFileSize(targetHdd, 0); logicalSize = VDGetSize(targetHdd, 0) / _1M; } catch (HRESULT aRC) { rc = aRC; } VDDestroy(targetHdd); } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } /* Only do the parent changes for newly created images. */ if (SUCCEEDED(rc) && fCreatingTarget) { /* we set mParent & children() */ AutoWriteLock alock2(m->pVirtualBox->getMediaTreeLockHandle() COMMA_LOCKVAL_SRC_POS); Assert(pTarget->m->pParent.isNull()); if (pParent) { /* associate the clone with the parent and deassociate * from VirtualBox */ pTarget->m->pParent = pParent; pParent->m->llChildren.push_back(pTarget); /* register with mVirtualBox as the last step and move to * Created state only on success (leaving an orphan file is * better than breaking media registry consistency) */ rc = pParent->m->pVirtualBox->registerHardDisk(pTarget, NULL /* pfNeedsSaveSettings */); if (FAILED(rc)) /* break parent association on failure to register */ pTarget->deparent(); // removes target from parent } else { /* just register */ rc = m->pVirtualBox->registerHardDisk(pTarget, NULL /* pfNeedsSaveSettings */); } } if (fCreatingTarget) { AutoWriteLock mLock(pTarget COMMA_LOCKVAL_SRC_POS); if (SUCCEEDED(rc)) { pTarget->m->state = MediumState_Created; pTarget->m->size = size; pTarget->m->logicalSize = logicalSize; } else { /* back to NotCreated on failure */ pTarget->m->state = MediumState_NotCreated; /* reset UUID to prevent it from being reused next time */ if (fGenerateUuid) unconst(pTarget->m->id).clear(); } } // now, at the end of this task (always asynchronous), save the settings { AutoWriteLock vboxlock(m->pVirtualBox COMMA_LOCKVAL_SRC_POS); m->pVirtualBox->saveSettings(); } /* Everything is explicitly unlocked when the task exits, * as the task destruction also destroys the source chain. */ /* Make sure the source chain is released early. It could happen * that we get a deadlock in Appliance::Import when Medium::Close * is called & the source chain is released at the same time. */ task.d.source.reset(); return rc; } /** * Implementation code called from Medium::taskThread for the "delete" task. * * This task always gets started from Medium::deleteStorage() and can run * synchronously or asynchrously depending on the "wait" parameter passed to that * function. * * @return */ HRESULT Medium::taskThreadDelete() { HRESULT rc = S_OK; try { /* The lock is also used as a signal from the task initiator (which * releases it only after RTThreadCreate()) that we can start the job */ AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); Utf8Str format(m->strFormat); Utf8Str location(m->strLocationFull); /* unlock before the potentially lengthy operation */ Assert(m->state == MediumState_Deleting); thisLock.release(); try { vrc = VDOpen(hdd, format.c_str(), location.c_str(), VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO, m->vdDiskIfaces); if (RT_SUCCESS(vrc)) vrc = VDClose(hdd, true /* fDelete */); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not delete the hard disk storage unit '%s'%s"), location.raw(), vdError(vrc).raw()); } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); /* go to the NotCreated state even on failure since the storage * may have been already partially deleted and cannot be used any * more. One will be able to manually re-open the storage if really * needed to re-register it. */ m->state = MediumState_NotCreated; /* Reset UUID to prevent Create* from reusing it again */ unconst(m->id).clear(); return rc; } /** * Implementation code called from Medium::taskThread for the "reset" task. * * This always gets started asynchronously from Medium::Reset(). * * @param task * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadReset(void *pvdOperationIfaces, bool fIsAsync) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; uint64_t size = 0, logicalSize = 0; try { /* The lock is also used as a signal from the task initiator (which * releases it only after RTThreadCreate()) that we can start the job */ AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); /// @todo Below we use a pair of delete/create operations to reset /// the diff contents but the most efficient way will of course be /// to add a VDResetDiff() API call PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); Guid id = m->id; Utf8Str format(m->strFormat); Utf8Str location(m->strLocationFull); Medium *pParent = m->pParent; Guid parentId = pParent->m->id; Utf8Str parentFormat(pParent->m->strFormat); Utf8Str parentLocation(pParent->m->strLocationFull); Assert(m->state == MediumState_LockedWrite); /* unlock before the potentially lengthy operation */ thisLock.release(); try { /* first, delete the storage unit */ vrc = VDOpen(hdd, format.c_str(), location.c_str(), VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO, m->vdDiskIfaces); if (RT_SUCCESS(vrc)) vrc = VDClose(hdd, true /* fDelete */); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not delete the hard disk storage unit '%s'%s"), location.raw(), vdError(vrc).raw()); /* next, create it again */ vrc = VDOpen(hdd, parentFormat.c_str(), parentLocation.c_str(), VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO, m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not open the hard disk storage unit '%s'%s"), parentLocation.raw(), vdError(vrc).raw()); vrc = VDCreateDiff(hdd, format.c_str(), location.c_str(), /// @todo use the same image variant as before VD_IMAGE_FLAGS_NONE, NULL, id.raw(), parentId.raw(), VD_OPEN_FLAGS_NORMAL, m->vdDiskIfaces, vdOperationIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not create the differencing hard disk storage unit '%s'%s"), location.raw(), vdError(vrc).raw()); size = VDGetFileSize(hdd, 1); logicalSize = VDGetSize(hdd, 1) / _1M; } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); m->size = size; m->logicalSize = logicalSize; if (fIsAsync) { /* unlock ourselves when done */ HRESULT rc2 = UnlockWrite(NULL); AssertComRC(rc2); } /* Note that in sync mode, it's the caller's responsibility to * unlock the hard disk */ return rc; } /** * Implementation code called from Medium::taskThread for the "compact" task. * @param pvdOperationIfaces * @return */ HRESULT Medium::taskThreadCompact(Task &task, void *pvdOperationIfaces) { HRESULT rc = S_OK; PVDINTERFACE vdOperationIfaces = (PVDINTERFACE)pvdOperationIfaces; /* Lock all in {parent,child} order. The lock is also used as a * signal from the task initiator (which releases it only after * RTThreadCreate()) that we can start the job. */ AutoWriteLock thisLock(this COMMA_LOCKVAL_SRC_POS); ImageChain *imgChain = task.d.images.get(); try { PVBOXHDD hdd; int vrc = VDCreate(m->vdDiskIfaces, &hdd); ComAssertRCThrow(vrc, E_FAIL); try { /* Open all hard disk images in the chain. */ MediaList::const_iterator last = imgChain->end(); last--; for (MediaList::const_iterator it = imgChain->begin(); it != imgChain->end(); ++it) { /* sanity check */ if (it == last) Assert((*it)->m->state == MediumState_LockedWrite); else Assert((*it)->m->state == MediumState_LockedRead); /** Open all images but last in read-only mode. */ vrc = VDOpen(hdd, (*it)->m->strFormat.c_str(), (*it)->m->strLocationFull.c_str(), (it == last) ? VD_OPEN_FLAGS_NORMAL : VD_OPEN_FLAGS_READONLY, (*it)->m->vdDiskIfaces); if (RT_FAILURE(vrc)) throw setError(E_FAIL, tr("Could not open the hard disk storage unit '%s'%s"), (*it)->m->strLocationFull.raw(), vdError(vrc).raw()); } Assert(m->state == MediumState_LockedWrite); Utf8Str location(m->strLocationFull); /* unlock before the potentially lengthy operation */ thisLock.leave(); vrc = VDCompact(hdd, VD_LAST_IMAGE, vdOperationIfaces); if (RT_FAILURE(vrc)) { if (vrc == VERR_NOT_SUPPORTED) throw setError(VBOX_E_NOT_SUPPORTED, tr("Compacting is not yet supported for hard disk '%s'"), location.raw()); else if (vrc == VERR_NOT_IMPLEMENTED) throw setError(E_NOTIMPL, tr("Compacting is not implemented, hard disk '%s'"), location.raw()); else throw setError(E_FAIL, tr("Could not compact hard disk '%s'%s"), location.raw(), vdError(vrc).raw()); } } catch (HRESULT aRC) { rc = aRC; } VDDestroy(hdd); } catch (HRESULT aRC) { rc = aRC; } /* Everything is explicitly unlocked when the task exits, * as the task destruction also destroys the image chain. */ return rc; } /** * Thread function for time-consuming tasks. * * The Task structure passed to @a pvUser must be allocated using new and will * be freed by this method before it returns. * * @param pvUser Pointer to the Task instance. */ /* static */ DECLCALLBACK(int) Medium::taskThread(RTTHREAD thread, void *pvUser) { std::auto_ptr task(static_cast(pvUser)); AssertReturn(task.get(), VERR_GENERAL_FAILURE); bool fIsAsync = thread != NIL_RTTHREAD; Medium *that = task->that; /* Set up a per-operation progress interface, can be used freely (for * binary operations you can use it either on the source or target). */ VDINTERFACEPROGRESS vdIfCallsProgress; vdIfCallsProgress.cbSize = sizeof(VDINTERFACEPROGRESS); vdIfCallsProgress.enmInterface = VDINTERFACETYPE_PROGRESS; vdIfCallsProgress.pfnProgress = Medium::vdProgressCall; VDINTERFACE vdIfProgress; PVDINTERFACE vdOperationIfaces = NULL; int vrc1 = VDInterfaceAdd(&vdIfProgress, "Medium::vdInterfaceProgress", VDINTERFACETYPE_PROGRESS, &vdIfCallsProgress, task->m_pProgress, &vdOperationIfaces); AssertRCReturn(vrc1, E_FAIL); /* Note: no need in AutoCaller because Task does that */ LogFlowFuncEnter(); LogFlowFunc(("{%p}: operation=%d\n", that, task->m_operation)); HRESULT rc = S_OK; switch (task->m_operation) { //////////////////////////////////////////////////////////////////////// case Task::CreateBase: rc = that->taskThreadCreateBase(*task, (void*)vdOperationIfaces); break; case Task::CreateDiff: rc = that->taskThreadCreateDiff(*task, (void*)vdOperationIfaces, fIsAsync); break; case Task::Merge: rc = that->taskThreadMerge(*task, (void*)vdOperationIfaces, fIsAsync); break; case Task::Clone: rc = that->taskThreadClone(*task, (void*)vdOperationIfaces); break; case Task::Delete: rc = that->taskThreadDelete(); break; case Task::Reset: rc = that->taskThreadReset((void*)vdOperationIfaces, fIsAsync); break; case Task::Compact: rc = that->taskThreadCompact(*task, (void*)vdOperationIfaces); break; default: AssertFailedReturn(VERR_GENERAL_FAILURE); } /* complete the progress if run asynchronously */ if (fIsAsync) { if (!task->m_pProgress.isNull()) task->m_pProgress->notifyComplete(rc); } else { task->m_rc = rc; } LogFlowFunc(("rc=%Rhrc\n", rc)); LogFlowFuncLeave(); return VINF_SUCCESS; /// @todo ugly hack, fix ComAssert... later #undef setError } /* vi: set tabstop=4 shiftwidth=4 expandtab: */