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windows-nt/Source/XPSP1/NT/inetsrv/iis/svcs/mdadmin/mdwriter.cxx

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/*++
Copyright (c) 2000 Microsoft Corporation
Module Name:
mdwriter.cxx
Abstract:
This file contains implementation for snapshot writer class
Author:
Ming Lu (MingLu) 30-Apr-2000
--*/
#include <dbgutil.h>
#include "mdwriter.hxx"
#define TIMEOUT_INTERVAL ( 2 * 60 )
#define DEFAULT_SAVE_TIMEOUT 30000
#define MDWRITER_EVENT_TIMEOUT 30000
#define IISCOMPONENT L"IISMETABASE"
#define METABASEPATH L"%windir%\\system32\\inetsrv"
#define METABASENAME1 L"metabase.bin"
#define METABASENAME2 L"MetaBase.XML"
#define METABASENAME3 L"MBSchema.XML"
#define NT_SETUP_KEY "SYSTEM\\Setup"
static VSS_ID s_WRITERID =
{
0x59b1f0cf, 0x90ef, 0x465f,
0x96, 0x09, 0x6c, 0xa8, 0xb2, 0x93, 0x83, 0x66
};
static LPCWSTR s_WRITERNAME = L"IIS Metabase Writer";
BOOL g_fWriterSubscribed = FALSE;
CIISVssWriter * g_pIISVssWriter = NULL;
VOID CALLBACK UnlockMBProc(
LPVOID pIISVssWriter,
DWORD dwTimerLowValue,
DWORD dwTimerHighValue
);
BOOL
CIISVssWriter::Initialize(
VOID
)
{
HRESULT hr;
hr = CVssWriter::Initialize( s_WRITERID,
s_WRITERNAME,
VSS_UT_SYSTEMSERVICE,
VSS_ST_OTHER
);
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error in base object Initialize(). hr = %x\n",
hr ));
return FALSE;
}
m_hTimer = CreateWaitableTimer( NULL, FALSE, NULL );
if( !m_hTimer )
{
DBGPRINTF(( DBG_CONTEXT,
"Error creating timer object. hr = %x\n",
HRESULT_FROM_WIN32( GetLastError() ) ));
return FALSE;
}
hr = CoCreateInstance( CLSID_MDCOM, NULL, CLSCTX_SERVER, IID_IMDCOM, (void**) &m_pMdObject);
if( SUCCEEDED( hr ) )
{
hr = m_pMdObject->ComMDInitialize();
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error initialize MDCOM object. hr = %x\n",
hr ));
m_pMdObject->Release();
m_pMdObject = NULL;
return FALSE;
}
}
else
{
DBGPRINTF(( DBG_CONTEXT,
"Error creating MDCOM object. hr = %x\n",
hr ));
return FALSE;
}
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnIdentify(
IN IVssCreateWriterMetadata *pMetadata
)
{
HRESULT hr;
hr = pMetadata->AddComponent( VSS_CT_FILEGROUP,
NULL,
IISCOMPONENT,
NULL,
0,
0,
FALSE,
FALSE,
FALSE );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error AddComponent(). hr = %x\n",
hr ));
return FALSE;
}
hr = pMetadata->AddFilesToFileGroup( NULL,
IISCOMPONENT,
METABASEPATH,
METABASENAME1,
FALSE,
NULL );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error AddFilesToFileGroup(). hr = %x\n",
hr ));
return FALSE;
}
hr = pMetadata->AddFilesToFileGroup( NULL,
IISCOMPONENT,
METABASEPATH,
METABASENAME2,
FALSE,
NULL );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error AddFilesToFileGroup(). hr = %x\n",
hr ));
return FALSE;
}
hr = pMetadata->AddFilesToFileGroup( NULL,
IISCOMPONENT,
METABASEPATH,
METABASENAME3,
FALSE,
NULL );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error AddFilesToFileGroup(). hr = %x\n",
hr ));
return FALSE;
}
hr = pMetadata->SetRestoreMethod(
VSS_RME_RESTORE_AT_REBOOT, // restore method
NULL, // service name
NULL, // user procedure
VSS_WRE_NEVER, // when to call writer restore method
TRUE // reboot is required
);
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error setting restore method. hr = %x\n",
hr ));
return FALSE;
}
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnPrepareBackup(
IN IVssWriterComponents *pWriterComponents
)
{
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnPrepareSnapshot(
VOID
)
{
HRESULT hr;
if( IsPathAffected( METABASEPATH ) )
{
//
// First try to lock the tree
//
hr = m_pMdObject->ComMDOpenMetaObjectW( METADATA_MASTER_ROOT_HANDLE,
NULL,
METADATA_PERMISSION_READ,
DEFAULT_SAVE_TIMEOUT,
&m_mdhRoot);
if ( SUCCEEDED( hr ) ) {
//
// call metadata com api
//
hr = m_pMdObject->ComMDSaveData( m_mdhRoot );
if( SUCCEEDED( hr ) )
{
hr = m_pMdObject->ComMDCloseMetaObject( m_mdhRoot );
if( SUCCEEDED ( hr ) )
{
return TRUE;
}
DBGPRINTF(( DBG_CONTEXT,
"Error on unlocking the metabase. hr = %x\n",
hr ));
return FALSE;
}
DBGPRINTF(( DBG_CONTEXT,
"Error on saving the metabase. hr = %x\n",
hr ));
m_pMdObject->ComMDCloseMetaObject( m_mdhRoot );
return FALSE;
}
DBGPRINTF(( DBG_CONTEXT,
"Error on locking down the metabase. hr = %x\n",
hr ));
return FALSE;
}
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnFreeze(
VOID
)
{
HRESULT hr;
if( IsPathAffected( METABASEPATH ) )
{
//
// Lock down the metabase
//
hr = m_pMdObject->ComMDOpenMetaObjectW(METADATA_MASTER_ROOT_HANDLE,
NULL,
METADATA_PERMISSION_READ,
DEFAULT_SAVE_TIMEOUT,
&m_mdhRoot);
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error on locking down the metabase. hr = %x\n",
hr ));
return FALSE;
}
else
{
if( !ResetTimer( m_hTimer, TIMEOUT_INTERVAL ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Could not reset the internal timer. hr = %x\n",
hr ));
return FALSE;
}
EnterCriticalSection( &m_csMBLock );
m_fMBLocked = TRUE;
LeaveCriticalSection( &m_csMBLock );
}
}
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnThaw(
VOID
)
{
HRESULT hr;
if( IsPathAffected( METABASEPATH ) )
{
EnterCriticalSection( &m_csMBLock );
if( m_fMBLocked )
{
hr = m_pMdObject->ComMDCloseMetaObject( m_mdhRoot );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error on unlocking the metabase. hr = %x\n",
hr ));
LeaveCriticalSection( &m_csMBLock );
return FALSE;
}
m_fMBLocked = FALSE;
LeaveCriticalSection( &m_csMBLock );
CancelWaitableTimer( m_hTimer );
}
else
{
LeaveCriticalSection( &m_csMBLock );
}
}
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnBackupComplete(
IN IVssWriterComponents *pWriterComponents
)
{
return TRUE;
}
bool STDMETHODCALLTYPE
CIISVssWriter::OnAbort(
VOID
)
{
HRESULT hr;
if( IsPathAffected( METABASEPATH ) )
{
EnterCriticalSection( &m_csMBLock );
if( m_fMBLocked )
{
hr = m_pMdObject->ComMDCloseMetaObject( m_mdhRoot );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error on unlocking the metabase. hr = %x\n",
hr ));
LeaveCriticalSection( &m_csMBLock );
return FALSE;
}
m_fMBLocked = FALSE;
LeaveCriticalSection( &m_csMBLock );
CancelWaitableTimer( m_hTimer );
}
else
{
LeaveCriticalSection( &m_csMBLock );
}
}
return true;
}
VOID
CIISVssWriter::UnlockMetaBase(
VOID
)
{
HRESULT hr;
EnterCriticalSection( &m_csMBLock );
if( m_fMBLocked )
{
hr = m_pMdObject->ComMDCloseMetaObject( m_mdhRoot );
if( FAILED( hr ) )
{
DBGPRINTF(( DBG_CONTEXT,
"Error on unlocking the metabase. hr = %x\n",
hr ));
LeaveCriticalSection( &m_csMBLock );
return;
}
m_fMBLocked = FALSE;
}
LeaveCriticalSection( &m_csMBLock );
}
BOOL
CIISVssWriter::ResetTimer(
HANDLE hTimer,
DWORD dwDuration
)
{
LARGE_INTEGER li;
const int nNanosecondsPersecond = 10000000;
__int64 qwTimeFromNowInNanoseconds =
(__int64)dwDuration * nNanosecondsPersecond;
qwTimeFromNowInNanoseconds = -qwTimeFromNowInNanoseconds;
li.LowPart = (DWORD) (qwTimeFromNowInNanoseconds & 0xFFFFFFFF);
li.HighPart = (LONG) (qwTimeFromNowInNanoseconds >> 32);
if( !SetWaitableTimer( hTimer, &li, 0, UnlockMBProc, this, FALSE ) )
{
return FALSE;
}
return TRUE;
}
VOID CALLBACK
UnlockMBProc(
LPVOID pIISVssWriter,
DWORD dwTimerLowValue,
DWORD dwTimerHighValue
)
{
( ( CIISVssWriter * )pIISVssWriter )->UnlockMetaBase();
}
VOID
InitMDWriterThread(
HANDLE hMDWriterEvent
)
{
HKEY hKey;
DWORD dwType;
DWORD cbData;
DWORD dwSetupInProgress = 0;
DWORD dwUpgradeInProcess = 0;
DBG_ASSERT( hMDWriterEvent != NULL );
//
// Read the setup registry key to see if we are in
// setup mode. If we are, don't init IIS writer.
//
if ( !RegOpenKeyEx( HKEY_LOCAL_MACHINE,
NT_SETUP_KEY,
0,
KEY_QUERY_VALUE,
&hKey ) )
{
cbData = sizeof( DWORD );
if( !RegQueryValueEx( hKey,
"SystemSetupInProgress",
NULL,
&dwType,
( LPBYTE )&dwSetupInProgress,
&cbData ) )
{
if( dwType == REG_DWORD && dwSetupInProgress != 0 )
{
//
// We are in setup mode
//
RegCloseKey( hKey );
goto exit;
}
}
if( !RegQueryValueEx( hKey,
"UpgradeInProgress",
NULL,
&dwType,
( LPBYTE )&dwUpgradeInProcess,
&cbData ) )
{
if( dwType == REG_DWORD && dwUpgradeInProcess != 0 )
{
//
// We are in upgrade mode
//
RegCloseKey( hKey );
goto exit;
}
}
RegCloseKey( hKey );
}
//
// OK, we are not in setup mode, initialize our IIS writer
//
g_pIISVssWriter = new CIISVssWriter;
if ( g_pIISVssWriter == NULL )
{
//
// oh well. guess we won<6F>t support snapshots
//
DBGPRINTF(( DBG_CONTEXT,
"Error on creating the writer object, out of memory\n"
));
goto exit;
}
else
{
//
// cool, we<77>ve got the object now.
//
if( !g_pIISVssWriter->Initialize() )
{
DBGPRINTF(( DBG_CONTEXT,
"Error on initializing the writer object\n"
));
delete g_pIISVssWriter;
g_pIISVssWriter = NULL;
goto exit;
}
if( SUCCEEDED( g_pIISVssWriter->Subscribe() ) )
{
g_fWriterSubscribed = TRUE;
}
else
{
DBGPRINTF(( DBG_CONTEXT,
"Error on subscribing the writer object\n"
));
delete g_pIISVssWriter;
g_pIISVssWriter = NULL;
}
}
exit:
//
// Let the TerminateMDWriter know we are ready to terminate during
// IISADMIN service shutdown
//
SetEvent( hMDWriterEvent );
}
HRESULT
InitializeMDWriter(
HANDLE hMDWriterEvent
)
{
HRESULT hr = S_OK;
HANDLE hThread = NULL;
DWORD dwThreadID;
DBG_ASSERT( hMDWriterEvent != NULL );
hThread = CreateThread( NULL,
0,
( LPTHREAD_START_ROUTINE )InitMDWriterThread,
( PVOID )hMDWriterEvent,
0,
&dwThreadID);
if( hThread == NULL )
{
hr = HRESULT_FROM_WIN32( GetLastError() );
}
return hr;
}
VOID
TerminateMDWriter(
HANDLE hMDWriterEvent
)
{
DBG_ASSERT( hMDWriterEvent != NULL );
//
// Only do cleanup if the hMDWriterEvent is signaled
//
if( WAIT_OBJECT_0 == WaitForSingleObject( hMDWriterEvent,
MDWRITER_EVENT_TIMEOUT ) )
{
if( g_fWriterSubscribed )
{
DBG_ASSERT( g_pIISVssWriter );
g_pIISVssWriter->Unsubscribe();
}
if( g_pIISVssWriter )
{
delete g_pIISVssWriter;
g_pIISVssWriter = NULL;
}
}
}
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