/*++
Routine Description:
This routine updates the name of the target in the supplied stream handle context
Arguments:
DirectoryName - Supplies the directory name
StreamHandleContext - Returns the updated name in the stream context
Return Value:
Status
Note:
The caller must synchronize access to the context. This routine does no
synchronization
--*/
NTSTATUS
CtxUpdateNameInStreamHandleContext (
__in PUNICODE_STRING DirectoryName,
__inout PCTX_STREAMHANDLE_CONTEXT StreamHandleContext
)
{
NTSTATUS status;
PAGED_CODE();
//
// Free any existing name
//
if (StreamHandleContext->FileName.Buffer != NULL)
{
CtxFreeUnicodeString(&StreamHandleContext->FileName);
}
//
// Allocate and copy off the directory name
//
StreamHandleContext->FileName.MaximumLength = DirectoryName->Length;
status = CtxAllocateUnicodeString(&StreamHandleContext->FileName);
if (NT_SUCCESS(status))
{
RtlCopyUnicodeString(&StreamHandleContext->FileName, DirectoryName);
}
return status;
}
NTSTATUS
CtxUpdateNameInStreamHandleContext (
__in PUNICODE_STRING DirectoryName,
__inout PCTX_STREAMHANDLE_CONTEXT StreamHandleContext
)
/*++
Routine Description:
This routine updates the name of the target in the supplied stream handle context
Arguments:
DirectoryName - Supplies the directory name
StreamHandleContext - Returns the updated name in the stream context
Return Value:
Status
Note:
The caller must synchronize access to the context. This routine does no
synchronization
--*/
{
NTSTATUS status;
PAGED_CODE();
//
// Free any existing name
//
if (StreamHandleContext->FileName.Buffer != NULL) {
CtxFreeUnicodeString(&StreamHandleContext->FileName);
}
//
// Allocate and copy off the directory name
//
StreamHandleContext->FileName.MaximumLength = DirectoryName->Length;
status = CtxAllocateUnicodeString(&StreamHandleContext->FileName);
if (NT_SUCCESS(status)) {
RtlCopyUnicodeString(&StreamHandleContext->FileName, DirectoryName);
}
return status;
}
VOID
CtxContextCleanup (
__in PFLT_CONTEXT Context,
__in FLT_CONTEXT_TYPE ContextType
)
{
PCTX_INSTANCE_CONTEXT instanceContext;
PCTX_FILE_CONTEXT fileContext;
PCTX_STREAM_CONTEXT streamContext;
PCTX_STREAMHANDLE_CONTEXT streamHandleContext;
PAGED_CODE();
switch(ContextType) {
case FLT_INSTANCE_CONTEXT:
instanceContext = (PCTX_INSTANCE_CONTEXT) Context;
DebugTrace( DEBUG_TRACE_INSTANCE_CONTEXT_OPERATIONS,
("[Ctx]: Cleaning up instance context for volume %wZ (Context = %p)\n",
&instanceContext->VolumeName,
Context) );
#if __NDAS_FS_MINI__
if (instanceContext->DiskDeviceObject) {
ObDereferenceObject( instanceContext->DiskDeviceObject );
}
if (instanceContext->DeviceObject) {
ObDereferenceObject( instanceContext->DeviceObject );
}
if (instanceContext->VolumeProperties) {
ExFreePoolWithTag( instanceContext->VolumeProperties, CTX_VOLUME_PROPERTY_TAG );
}
#endif
//
// Here the filter should free memory or synchronization objects allocated to
// objects within the instance context. The instance context itself should NOT
// be freed. It will be freed by Filter Manager when the ref count on the
// context falls to zero.
//
CtxFreeUnicodeString( &instanceContext->VolumeName );
DebugTrace( DEBUG_TRACE_INSTANCE_CONTEXT_OPERATIONS,
("[Ctx]: Instance context cleanup complete.\n") );
break;
case FLT_FILE_CONTEXT:
fileContext = (PCTX_FILE_CONTEXT) Context;
DebugTrace( DEBUG_TRACE_FILE_CONTEXT_OPERATIONS,
("[Ctx]: Cleaning up file context for file %wZ (FileContext = %p)\n",
&fileContext->FileName,
fileContext) );
//
// Free the file name
//
if (fileContext->FileName.Buffer != NULL) {
CtxFreeUnicodeString(&fileContext->FileName);
}
DebugTrace( DEBUG_TRACE_FILE_CONTEXT_OPERATIONS,
("[Ctx]: File context cleanup complete.\n") );
break;
case FLT_STREAM_CONTEXT:
streamContext = (PCTX_STREAM_CONTEXT) Context;
DebugTrace( DEBUG_TRACE_STREAM_CONTEXT_OPERATIONS,
("[Ctx]: Cleaning up stream context for file %wZ (StreamContext = %p) \n\tCreateCount = %x \n\tCleanupCount = %x, \n\tCloseCount = %x\n",
&streamContext->FileName,
streamContext,
streamContext->CreateCount,
streamContext->CleanupCount,
streamContext->CloseCount) );
//
// Delete the resource and memory the memory allocated for the resource
//
if (streamContext->Resource != NULL) {
ExDeleteResourceLite( streamContext->Resource );
CtxFreeResource( streamContext->Resource );
}
//
// Free the file name
//
if (streamContext->FileName.Buffer != NULL) {
CtxFreeUnicodeString(&streamContext->FileName);
}
DebugTrace( DEBUG_TRACE_STREAM_CONTEXT_OPERATIONS,
("[Ctx]: Stream context cleanup complete.\n") );
break;
case FLT_STREAMHANDLE_CONTEXT:
streamHandleContext = (PCTX_STREAMHANDLE_CONTEXT) Context;
DebugTrace( DEBUG_TRACE_STREAMHANDLE_CONTEXT_OPERATIONS,
("[Ctx]: Cleaning up stream handle context for file %wZ (StreamContext = %p)\n",
&streamHandleContext->FileName,
streamHandleContext) );
//
// Delete the resource and memory the memory allocated for the resource
//
if (streamHandleContext->Resource != NULL) {
ExDeleteResourceLite( streamHandleContext->Resource );
CtxFreeResource( streamHandleContext->Resource );
}
//
// Free the file name
//
if (streamHandleContext->FileName.Buffer != NULL) {
CtxFreeUnicodeString(&streamHandleContext->FileName);
}
DebugTrace( DEBUG_TRACE_STREAMHANDLE_CONTEXT_OPERATIONS,
("[Ctx]: Stream handle context cleanup complete.\n") );
break;
}
}