538 lines
13 KiB
C++
538 lines
13 KiB
C++
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/*
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* QEMU Guest Agent win32 VSS Provider implementations
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*
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* Copyright Hitachi Data Systems Corp. 2013
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*
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* Authors:
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* Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "vss-common.h"
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#ifdef HAVE_VSS_SDK
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#include <vscoordint.h>
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#else
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#include <vsadmin.h>
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#endif
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#include <vsprov.h>
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#define VSS_TIMEOUT_MSEC (60*1000)
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static long g_nComObjsInUse;
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HINSTANCE g_hinstDll;
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/* VSS common GUID's */
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const CLSID CLSID_VSSCoordinator = { 0xE579AB5F, 0x1CC4, 0x44b4,
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{0xBE, 0xD9, 0xDE, 0x09, 0x91, 0xFF, 0x06, 0x23} };
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const IID IID_IVssAdmin = { 0x77ED5996, 0x2F63, 0x11d3,
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{0x8A, 0x39, 0x00, 0xC0, 0x4F, 0x72, 0xD8, 0xE3} };
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const IID IID_IVssHardwareSnapshotProvider = { 0x9593A157, 0x44E9, 0x4344,
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{0xBB, 0xEB, 0x44, 0xFB, 0xF9, 0xB0, 0x6B, 0x10} };
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const IID IID_IVssSoftwareSnapshotProvider = { 0x609e123e, 0x2c5a, 0x44d3,
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{0x8f, 0x01, 0x0b, 0x1d, 0x9a, 0x47, 0xd1, 0xff} };
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const IID IID_IVssProviderCreateSnapshotSet = { 0x5F894E5B, 0x1E39, 0x4778,
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{0x8E, 0x23, 0x9A, 0xBA, 0xD9, 0xF0, 0xE0, 0x8C} };
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const IID IID_IVssProviderNotifications = { 0xE561901F, 0x03A5, 0x4afe,
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{0x86, 0xD0, 0x72, 0xBA, 0xEE, 0xCE, 0x70, 0x04} };
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const IID IID_IVssEnumObject = { 0xAE1C7110, 0x2F60, 0x11d3,
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{0x8A, 0x39, 0x00, 0xC0, 0x4F, 0x72, 0xD8, 0xE3} };
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void LockModule(BOOL lock)
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{
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if (lock) {
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InterlockedIncrement(&g_nComObjsInUse);
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} else {
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InterlockedDecrement(&g_nComObjsInUse);
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}
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}
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/* Empty enumerator for VssObject */
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class CQGAVSSEnumObject : public IVssEnumObject
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{
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public:
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STDMETHODIMP QueryInterface(REFIID riid, void **ppObj);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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/* IVssEnumObject Methods */
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STDMETHODIMP Next(
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ULONG celt, VSS_OBJECT_PROP *rgelt, ULONG *pceltFetched);
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STDMETHODIMP Skip(ULONG celt);
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STDMETHODIMP Reset(void);
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STDMETHODIMP Clone(IVssEnumObject **ppenum);
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/* CQGAVSSEnumObject Methods */
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CQGAVSSEnumObject();
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~CQGAVSSEnumObject();
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private:
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long m_nRefCount;
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};
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CQGAVSSEnumObject::CQGAVSSEnumObject()
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{
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m_nRefCount = 0;
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LockModule(TRUE);
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}
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CQGAVSSEnumObject::~CQGAVSSEnumObject()
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{
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LockModule(FALSE);
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}
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STDMETHODIMP CQGAVSSEnumObject::QueryInterface(REFIID riid, void **ppObj)
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{
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if (riid == IID_IUnknown || riid == IID_IVssEnumObject) {
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*ppObj = static_cast<void*>(static_cast<IVssEnumObject*>(this));
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AddRef();
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return S_OK;
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}
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*ppObj = NULL;
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CQGAVSSEnumObject::AddRef()
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{
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return InterlockedIncrement(&m_nRefCount);
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}
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STDMETHODIMP_(ULONG) CQGAVSSEnumObject::Release()
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{
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long nRefCount = InterlockedDecrement(&m_nRefCount);
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if (m_nRefCount == 0) {
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delete this;
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}
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return nRefCount;
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}
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STDMETHODIMP CQGAVSSEnumObject::Next(
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ULONG celt, VSS_OBJECT_PROP *rgelt, ULONG *pceltFetched)
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{
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*pceltFetched = 0;
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return S_FALSE;
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}
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STDMETHODIMP CQGAVSSEnumObject::Skip(ULONG celt)
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{
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return S_FALSE;
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}
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STDMETHODIMP CQGAVSSEnumObject::Reset(void)
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{
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return S_OK;
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}
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STDMETHODIMP CQGAVSSEnumObject::Clone(IVssEnumObject **ppenum)
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{
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return E_NOTIMPL;
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}
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/* QGAVssProvider */
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class CQGAVssProvider :
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public IVssSoftwareSnapshotProvider,
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public IVssProviderCreateSnapshotSet,
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public IVssProviderNotifications
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{
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public:
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STDMETHODIMP QueryInterface(REFIID riid, void **ppObj);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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/* IVssSoftwareSnapshotProvider Methods */
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STDMETHODIMP SetContext(LONG lContext);
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STDMETHODIMP GetSnapshotProperties(
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VSS_ID SnapshotId, VSS_SNAPSHOT_PROP *pProp);
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STDMETHODIMP Query(
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VSS_ID QueriedObjectId, VSS_OBJECT_TYPE eQueriedObjectType,
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VSS_OBJECT_TYPE eReturnedObjectsType, IVssEnumObject **ppEnum);
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STDMETHODIMP DeleteSnapshots(
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VSS_ID SourceObjectId, VSS_OBJECT_TYPE eSourceObjectType,
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BOOL bForceDelete, LONG *plDeletedSnapshots,
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VSS_ID *pNondeletedSnapshotID);
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STDMETHODIMP BeginPrepareSnapshot(
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VSS_ID SnapshotSetId, VSS_ID SnapshotId,
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VSS_PWSZ pwszVolumeName, LONG lNewContext);
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STDMETHODIMP IsVolumeSupported(
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VSS_PWSZ pwszVolumeName, BOOL *pbSupportedByThisProvider);
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STDMETHODIMP IsVolumeSnapshotted(
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VSS_PWSZ pwszVolumeName, BOOL *pbSnapshotsPresent,
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LONG *plSnapshotCompatibility);
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STDMETHODIMP SetSnapshotProperty(
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VSS_ID SnapshotId, VSS_SNAPSHOT_PROPERTY_ID eSnapshotPropertyId,
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VARIANT vProperty);
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STDMETHODIMP RevertToSnapshot(VSS_ID SnapshotId);
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STDMETHODIMP QueryRevertStatus(VSS_PWSZ pwszVolume, IVssAsync **ppAsync);
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/* IVssProviderCreateSnapshotSet Methods */
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STDMETHODIMP EndPrepareSnapshots(VSS_ID SnapshotSetId);
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STDMETHODIMP PreCommitSnapshots(VSS_ID SnapshotSetId);
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STDMETHODIMP CommitSnapshots(VSS_ID SnapshotSetId);
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STDMETHODIMP PostCommitSnapshots(
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VSS_ID SnapshotSetId, LONG lSnapshotsCount);
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STDMETHODIMP PreFinalCommitSnapshots(VSS_ID SnapshotSetId);
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STDMETHODIMP PostFinalCommitSnapshots(VSS_ID SnapshotSetId);
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STDMETHODIMP AbortSnapshots(VSS_ID SnapshotSetId);
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/* IVssProviderNotifications Methods */
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STDMETHODIMP OnLoad(IUnknown *pCallback);
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STDMETHODIMP OnUnload(BOOL bForceUnload);
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/* CQGAVssProvider Methods */
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CQGAVssProvider();
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~CQGAVssProvider();
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private:
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long m_nRefCount;
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};
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CQGAVssProvider::CQGAVssProvider()
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{
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m_nRefCount = 0;
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LockModule(TRUE);
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}
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CQGAVssProvider::~CQGAVssProvider()
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{
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LockModule(FALSE);
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}
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STDMETHODIMP CQGAVssProvider::QueryInterface(REFIID riid, void **ppObj)
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{
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if (riid == IID_IUnknown) {
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*ppObj = static_cast<void*>(this);
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AddRef();
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return S_OK;
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}
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if (riid == IID_IVssSoftwareSnapshotProvider) {
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*ppObj = static_cast<void*>(
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static_cast<IVssSoftwareSnapshotProvider*>(this));
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AddRef();
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return S_OK;
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}
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if (riid == IID_IVssProviderCreateSnapshotSet) {
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*ppObj = static_cast<void*>(
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static_cast<IVssProviderCreateSnapshotSet*>(this));
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AddRef();
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return S_OK;
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}
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if (riid == IID_IVssProviderNotifications) {
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*ppObj = static_cast<void*>(
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static_cast<IVssProviderNotifications*>(this));
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AddRef();
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return S_OK;
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}
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*ppObj = NULL;
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CQGAVssProvider::AddRef()
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{
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return InterlockedIncrement(&m_nRefCount);
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}
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STDMETHODIMP_(ULONG) CQGAVssProvider::Release()
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{
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long nRefCount = InterlockedDecrement(&m_nRefCount);
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if (m_nRefCount == 0) {
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delete this;
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}
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return nRefCount;
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}
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/*
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* IVssSoftwareSnapshotProvider methods
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*/
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STDMETHODIMP CQGAVssProvider::SetContext(LONG lContext)
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{
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::GetSnapshotProperties(
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VSS_ID SnapshotId, VSS_SNAPSHOT_PROP *pProp)
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{
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return VSS_E_OBJECT_NOT_FOUND;
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}
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STDMETHODIMP CQGAVssProvider::Query(
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VSS_ID QueriedObjectId, VSS_OBJECT_TYPE eQueriedObjectType,
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VSS_OBJECT_TYPE eReturnedObjectsType, IVssEnumObject **ppEnum)
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{
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try {
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*ppEnum = new CQGAVSSEnumObject;
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} catch (...) {
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return E_OUTOFMEMORY;
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}
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(*ppEnum)->AddRef();
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::DeleteSnapshots(
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VSS_ID SourceObjectId, VSS_OBJECT_TYPE eSourceObjectType,
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BOOL bForceDelete, LONG *plDeletedSnapshots, VSS_ID *pNondeletedSnapshotID)
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{
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*plDeletedSnapshots = 0;
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*pNondeletedSnapshotID = SourceObjectId;
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::BeginPrepareSnapshot(
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VSS_ID SnapshotSetId, VSS_ID SnapshotId,
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VSS_PWSZ pwszVolumeName, LONG lNewContext)
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{
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::IsVolumeSupported(
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VSS_PWSZ pwszVolumeName, BOOL *pbSupportedByThisProvider)
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{
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HANDLE hEventFrozen;
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/* Check if a requester is qemu-ga by whether an event is created */
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hEventFrozen = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_FROZEN);
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if (!hEventFrozen) {
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*pbSupportedByThisProvider = FALSE;
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return S_OK;
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}
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CloseHandle(hEventFrozen);
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*pbSupportedByThisProvider = TRUE;
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::IsVolumeSnapshotted(VSS_PWSZ pwszVolumeName,
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BOOL *pbSnapshotsPresent, LONG *plSnapshotCompatibility)
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{
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*pbSnapshotsPresent = FALSE;
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*plSnapshotCompatibility = 0;
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::SetSnapshotProperty(VSS_ID SnapshotId,
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VSS_SNAPSHOT_PROPERTY_ID eSnapshotPropertyId, VARIANT vProperty)
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{
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return E_NOTIMPL;
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}
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STDMETHODIMP CQGAVssProvider::RevertToSnapshot(VSS_ID SnapshotId)
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{
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return E_NOTIMPL;
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}
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STDMETHODIMP CQGAVssProvider::QueryRevertStatus(
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VSS_PWSZ pwszVolume, IVssAsync **ppAsync)
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{
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return E_NOTIMPL;
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}
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/*
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* IVssProviderCreateSnapshotSet methods
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*/
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STDMETHODIMP CQGAVssProvider::EndPrepareSnapshots(VSS_ID SnapshotSetId)
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{
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::PreCommitSnapshots(VSS_ID SnapshotSetId)
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{
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return S_OK;
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}
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STDMETHODIMP CQGAVssProvider::CommitSnapshots(VSS_ID SnapshotSetId)
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{
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HRESULT hr = S_OK;
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HANDLE hEventFrozen, hEventThaw, hEventTimeout;
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hEventFrozen = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_FROZEN);
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if (!hEventFrozen) {
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return E_FAIL;
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}
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hEventThaw = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_THAW);
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if (!hEventThaw) {
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CloseHandle(hEventFrozen);
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|
|
return E_FAIL;
|
||
|
|
}
|
||
|
|
|
||
|
|
hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
|
||
|
|
if (!hEventTimeout) {
|
||
|
|
CloseHandle(hEventFrozen);
|
||
|
|
CloseHandle(hEventThaw);
|
||
|
|
return E_FAIL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Send event to qemu-ga to notify filesystem is frozen */
|
||
|
|
SetEvent(hEventFrozen);
|
||
|
|
|
||
|
|
/* Wait until the snapshot is taken by the host. */
|
||
|
|
if (WaitForSingleObject(hEventThaw, VSS_TIMEOUT_MSEC) != WAIT_OBJECT_0) {
|
||
|
|
/* Send event to qemu-ga to notify the provider is timed out */
|
||
|
|
SetEvent(hEventTimeout);
|
||
|
|
}
|
||
|
|
|
||
|
|
CloseHandle(hEventThaw);
|
||
|
|
CloseHandle(hEventFrozen);
|
||
|
|
CloseHandle(hEventTimeout);
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::PostCommitSnapshots(
|
||
|
|
VSS_ID SnapshotSetId, LONG lSnapshotsCount)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::PreFinalCommitSnapshots(VSS_ID SnapshotSetId)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::PostFinalCommitSnapshots(VSS_ID SnapshotSetId)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::AbortSnapshots(VSS_ID SnapshotSetId)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IVssProviderNotifications methods
|
||
|
|
*/
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::OnLoad(IUnknown *pCallback)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProvider::OnUnload(BOOL bForceUnload)
|
||
|
|
{
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CQGAVssProviderFactory class
|
||
|
|
*/
|
||
|
|
|
||
|
|
class CQGAVssProviderFactory : public IClassFactory
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
STDMETHODIMP QueryInterface(REFIID riid, void **ppv);
|
||
|
|
STDMETHODIMP_(ULONG) AddRef();
|
||
|
|
STDMETHODIMP_(ULONG) Release();
|
||
|
|
STDMETHODIMP CreateInstance(
|
||
|
|
IUnknown *pUnknownOuter, REFIID iid, void **ppv);
|
||
|
|
STDMETHODIMP LockServer(BOOL lock) { return E_NOTIMPL; }
|
||
|
|
|
||
|
|
CQGAVssProviderFactory();
|
||
|
|
~CQGAVssProviderFactory();
|
||
|
|
|
||
|
|
private:
|
||
|
|
long m_nRefCount;
|
||
|
|
};
|
||
|
|
|
||
|
|
CQGAVssProviderFactory::CQGAVssProviderFactory()
|
||
|
|
{
|
||
|
|
m_nRefCount = 0;
|
||
|
|
LockModule(TRUE);
|
||
|
|
}
|
||
|
|
|
||
|
|
CQGAVssProviderFactory::~CQGAVssProviderFactory()
|
||
|
|
{
|
||
|
|
LockModule(FALSE);
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProviderFactory::QueryInterface(REFIID riid, void **ppv)
|
||
|
|
{
|
||
|
|
if (riid == IID_IUnknown || riid == IID_IClassFactory) {
|
||
|
|
*ppv = static_cast<void*>(this);
|
||
|
|
AddRef();
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
*ppv = NULL;
|
||
|
|
return E_NOINTERFACE;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP_(ULONG) CQGAVssProviderFactory::AddRef()
|
||
|
|
{
|
||
|
|
return InterlockedIncrement(&m_nRefCount);
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP_(ULONG) CQGAVssProviderFactory::Release()
|
||
|
|
{
|
||
|
|
long nRefCount = InterlockedDecrement(&m_nRefCount);
|
||
|
|
if (m_nRefCount == 0) {
|
||
|
|
delete this;
|
||
|
|
}
|
||
|
|
return nRefCount;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDMETHODIMP CQGAVssProviderFactory::CreateInstance(
|
||
|
|
IUnknown *pUnknownOuter, REFIID iid, void **ppv)
|
||
|
|
{
|
||
|
|
CQGAVssProvider *pObj;
|
||
|
|
|
||
|
|
if (pUnknownOuter) {
|
||
|
|
return CLASS_E_NOAGGREGATION;
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
pObj = new CQGAVssProvider;
|
||
|
|
} catch (...) {
|
||
|
|
return E_OUTOFMEMORY;
|
||
|
|
}
|
||
|
|
HRESULT hr = pObj->QueryInterface(iid, ppv);
|
||
|
|
if (FAILED(hr)) {
|
||
|
|
delete pObj;
|
||
|
|
}
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* DLL functions
|
||
|
|
*/
|
||
|
|
|
||
|
|
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
|
||
|
|
{
|
||
|
|
CQGAVssProviderFactory *factory;
|
||
|
|
try {
|
||
|
|
factory = new CQGAVssProviderFactory;
|
||
|
|
} catch (...) {
|
||
|
|
return E_OUTOFMEMORY;
|
||
|
|
}
|
||
|
|
factory->AddRef();
|
||
|
|
HRESULT hr = factory->QueryInterface(riid, ppv);
|
||
|
|
factory->Release();
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
STDAPI DllCanUnloadNow()
|
||
|
|
{
|
||
|
|
return g_nComObjsInUse == 0 ? S_OK : S_FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
EXTERN_C
|
||
|
|
BOOL WINAPI DllMain(HINSTANCE hinstDll, DWORD dwReason, LPVOID lpReserved)
|
||
|
|
{
|
||
|
|
if (dwReason == DLL_PROCESS_ATTACH) {
|
||
|
|
g_hinstDll = hinstDll;
|
||
|
|
DisableThreadLibraryCalls(hinstDll);
|
||
|
|
}
|
||
|
|
return TRUE;
|
||
|
|
}
|