// Lists the status for all writers
void VssClient::ListWriterStatus()
{
FunctionTracer ft(DBG_INFO);
ft.WriteLine(L"Listing writer status ...");
// Gets the number of writers in the gathered status info
// (WARNING: GatherWriterStatus must be called before)
unsigned cWriters = 0;
CHECK_COM(m_pVssObject->GetWriterStatusCount(&cWriters));
ft.WriteLine(L"- Number of writers that responded: %u", cWriters);
// Enumerate each writer
for(unsigned iWriter = 0; iWriter < cWriters; iWriter++)
{
VSS_ID idInstance = GUID_NULL;
VSS_ID idWriter= GUID_NULL;
VSS_WRITER_STATE eWriterStatus = VSS_WS_UNKNOWN;
CComBSTR bstrWriterName;
HRESULT hrWriterFailure = S_OK;
// Get writer status
CHECK_COM(m_pVssObject->GetWriterStatus(iWriter,
&idInstance,
&idWriter,
&bstrWriterName,
&eWriterStatus,
&hrWriterFailure));
// Print writer status
ft.WriteLine(L"\n"
L"* WRITER \"%s\"\n"
L" - Status: %d (%s)\n"
L" - Writer Failure code: 0x%08lx (%s)\n"
L" - Writer ID: " WSTR_GUID_FMT L"\n"
L" - Instance ID: " WSTR_GUID_FMT L"\n",
(PWCHAR)bstrWriterName,
eWriterStatus, GetStringFromWriterStatus(eWriterStatus).c_str(),
hrWriterFailure, FunctionTracer::HResult2String(hrWriterFailure).c_str(),
GUID_PRINTF_ARG(idWriter),
GUID_PRINTF_ARG(idInstance)
);
}
}
// Check the status for all selected writers.
HRESULT GoogleVssClient::CheckSelectedWriterStatus() {
// Gather writer status to detect potential errors.
HRESULT hr = GatherWriterStatus();
if (SUCCEEDED(hr)) {
// Gets the number of writers in the gathered status info
// (WARNING: GatherWriterStatus must be called before).
unsigned writers = 0;
hr = vss_object_->GetWriterStatusCount(&writers);
if (FAILED(hr)) {
LogDebugMessage(L"GetWriterStatusCount failed with error %x ", hr);
} else {
// Enumerate each writer.
HRESULT hrWriterFailure = S_OK;
for (unsigned writer = 0; writer < writers; writer++) {
VSS_ID idInstance = GUID_NULL;
VSS_ID idWriter = GUID_NULL;
VSS_WRITER_STATE writerStatus = VSS_WS_UNKNOWN;
CComBSTR bstrWriterName;
// Get writer status.
hr = vss_object_->GetWriterStatus(writer, &idInstance, &idWriter,
&bstrWriterName, &writerStatus,
&hrWriterFailure);
// If the writer is not selected, just continue.
if (!IsWriterSelected(idInstance)) {
continue;
}
// If the writer is in non-stable state, break.
switch (writerStatus) {
case VSS_WS_FAILED_AT_IDENTIFY:
case VSS_WS_FAILED_AT_PREPARE_BACKUP:
case VSS_WS_FAILED_AT_PREPARE_SNAPSHOT:
case VSS_WS_FAILED_AT_FREEZE:
case VSS_WS_FAILED_AT_THAW:
case VSS_WS_FAILED_AT_POST_SNAPSHOT:
case VSS_WS_FAILED_AT_BACKUP_COMPLETE:
case VSS_WS_FAILED_AT_PRE_RESTORE:
case VSS_WS_FAILED_AT_POST_RESTORE:
// Print writer status.
LogDebugMessage(
L"ERROR: Selected writer '%s' is in failed state."
L" Status: %d (%s), Writer Failure code: 0x%08lx,"
L" Writer ID: " WSTR_GUID_FMT L" Instance ID: " WSTR_GUID_FMT,
BstrToWString(bstrWriterName).c_str(), writerStatus,
GetStringFromWriterStatus(writerStatus).c_str(),
hrWriterFailure,
GUID_PRINTF_ARG(idWriter), GUID_PRINTF_ARG(idInstance));
// Stop here.
hr = E_UNEXPECTED;
break;
default:
break;
}
if (FAILED(hr)) {
break;
}
}
}
}
LogDebugMessage(L"CheckSelectedWriterStatus returned with %x", hr);
return hr;
}
