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cleanup NtDeviceIoControlFile a bit...remove some redundant stuff
svn path=/trunk/; revision=15235
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942e1f4649
commit
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1 changed files with 105 additions and 96 deletions
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@ -1104,114 +1104,123 @@ IoValidateDeviceIoControlAccess(IN PIRP Irp,
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/*
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* @implemented
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*/
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NTSTATUS STDCALL
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NtDeviceIoControlFile (IN HANDLE DeviceHandle,
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IN HANDLE Event OPTIONAL,
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IN PIO_APC_ROUTINE UserApcRoutine OPTIONAL,
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IN PVOID UserApcContext OPTIONAL,
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OUT PIO_STATUS_BLOCK IoStatusBlock,
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IN ULONG IoControlCode,
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IN PVOID InputBuffer,
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IN ULONG InputBufferLength OPTIONAL,
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OUT PVOID OutputBuffer,
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IN ULONG OutputBufferLength OPTIONAL)
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NTSTATUS
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STDCALL
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NtDeviceIoControlFile(IN HANDLE DeviceHandle,
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IN HANDLE Event OPTIONAL,
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IN PIO_APC_ROUTINE UserApcRoutine OPTIONAL,
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IN PVOID UserApcContext OPTIONAL,
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OUT PIO_STATUS_BLOCK IoStatusBlock,
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IN ULONG IoControlCode,
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IN PVOID InputBuffer,
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IN ULONG InputBufferLength OPTIONAL,
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OUT PVOID OutputBuffer,
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IN ULONG OutputBufferLength OPTIONAL)
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{
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NTSTATUS Status;
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PFILE_OBJECT FileObject;
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PDEVICE_OBJECT DeviceObject;
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PIRP Irp;
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PIO_STACK_LOCATION StackPtr;
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PKEVENT EventObject;
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KPROCESSOR_MODE PreviousMode;
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NTSTATUS Status = STATUS_SUCCESS;
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PFILE_OBJECT FileObject;
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PDEVICE_OBJECT DeviceObject;
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PIRP Irp;
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PIO_STACK_LOCATION StackPtr;
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PKEVENT EventObject = NULL;
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BOOLEAN LocalEvent;
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KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
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DPRINT("NtDeviceIoControlFile(DeviceHandle %x Event %x UserApcRoutine %x "
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"UserApcContext %x IoStatusBlock %x IoControlCode %x "
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"InputBuffer %x InputBufferLength %x OutputBuffer %x "
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"OutputBufferLength %x)\n",
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DeviceHandle,Event,UserApcRoutine,UserApcContext,IoStatusBlock,
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IoControlCode,InputBuffer,InputBufferLength,OutputBuffer,
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OutputBufferLength);
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DPRINT("NtDeviceIoControlFile(DeviceHandle %x Event %x UserApcRoutine %x "
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"UserApcContext %x IoStatusBlock %x IoControlCode %x "
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"InputBuffer %x InputBufferLength %x OutputBuffer %x "
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"OutputBufferLength %x)\n",
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DeviceHandle,Event,UserApcRoutine,UserApcContext,IoStatusBlock,
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IoControlCode,InputBuffer,InputBufferLength,OutputBuffer,
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OutputBufferLength);
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if (IoStatusBlock == NULL)
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return STATUS_ACCESS_VIOLATION;
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if (IoStatusBlock == NULL) return STATUS_ACCESS_VIOLATION;
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PreviousMode = ExGetPreviousMode();
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/* Check granted access against the access rights from IoContolCode */
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Status = ObReferenceObjectByHandle(DeviceHandle,
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(IoControlCode >> 14) & 0x3,
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IoFileObjectType,
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PreviousMode,
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(PVOID *) &FileObject,
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NULL);
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if (!NT_SUCCESS(Status)) return Status;
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/* Check granted access against the access rights from IoContolCode */
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Status = ObReferenceObjectByHandle (DeviceHandle,
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(IoControlCode >> 14) & 0x3,
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IoFileObjectType,
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PreviousMode,
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(PVOID *) &FileObject,
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NULL);
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if (!NT_SUCCESS(Status))
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/* Check for an event */
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if (Event)
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{
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return Status;
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/* Reference it */
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Status = ObReferenceObjectByHandle(Event,
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EVENT_MODIFY_STATE,
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ExEventObjectType,
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PreviousMode,
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(PVOID*)&EventObject,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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ObDereferenceObject (FileObject);
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return Status;
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}
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/* Clear it */
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KeClearEvent(EventObject);
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}
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if (Event != NULL)
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/* Check if this is a direct open or not */
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if (FileObject->Flags & FO_DIRECT_DEVICE_OPEN)
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{
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Status = ObReferenceObjectByHandle (Event,
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SYNCHRONIZE,
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ExEventObjectType,
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PreviousMode,
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(PVOID*)&EventObject,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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ObDereferenceObject (FileObject);
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return Status;
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}
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}
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else
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{
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EventObject = &FileObject->Event;
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KeResetEvent (EventObject);
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}
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DeviceObject = FileObject->DeviceObject;
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Irp = IoBuildDeviceIoControlRequest (IoControlCode,
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DeviceObject,
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InputBuffer,
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InputBufferLength,
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OutputBuffer,
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OutputBufferLength,
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FALSE,
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EventObject,
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IoStatusBlock);
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/* Trigger FileObject/Event dereferencing */
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Irp->Tail.Overlay.OriginalFileObject = FileObject;
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Irp->RequestorMode = PreviousMode;
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Irp->Overlay.AsynchronousParameters.UserApcRoutine = UserApcRoutine;
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Irp->Overlay.AsynchronousParameters.UserApcContext = UserApcContext;
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StackPtr = IoGetNextIrpStackLocation(Irp);
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StackPtr->FileObject = FileObject;
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StackPtr->DeviceObject = DeviceObject;
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StackPtr->Parameters.DeviceIoControl.InputBufferLength = InputBufferLength;
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StackPtr->Parameters.DeviceIoControl.OutputBufferLength = OutputBufferLength;
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Status = IoCallDriver(DeviceObject,Irp);
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if (Status == STATUS_PENDING && (FileObject->Flags & FO_SYNCHRONOUS_IO))
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DeviceObject = IoGetAttachedDevice(FileObject->DeviceObject);
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}
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else
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{
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Status = KeWaitForSingleObject (EventObject,
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Executive,
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PreviousMode,
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FileObject->Flags & FO_ALERTABLE_IO,
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NULL);
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if (Status != STATUS_WAIT_0)
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{
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/* Wait failed. */
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return Status;
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}
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Status = IoStatusBlock->Status;
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DeviceObject = IoGetRelatedDeviceObject(FileObject);
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}
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return Status;
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/* Check if we should use Sync IO or not */
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if (FileObject->Flags & FO_SYNCHRONOUS_IO)
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{
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/* Use File Object event */
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KeClearEvent(&FileObject->Event);
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}
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else
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{
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/* Use local event */
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LocalEvent = TRUE;
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}
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/* Build the IRP */
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Irp = IoBuildDeviceIoControlRequest(IoControlCode,
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DeviceObject,
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InputBuffer,
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InputBufferLength,
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OutputBuffer,
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OutputBufferLength,
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FALSE,
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EventObject,
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IoStatusBlock);
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/* Set some extra settings */
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Irp->Tail.Overlay.OriginalFileObject = FileObject;
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Irp->RequestorMode = PreviousMode;
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StackPtr = IoGetNextIrpStackLocation(Irp);
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StackPtr->FileObject = FileObject;
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/* Call the Driver */
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Status = IoCallDriver(DeviceObject, Irp);
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if (Status == STATUS_PENDING)
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{
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if (!LocalEvent)
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{
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KeWaitForSingleObject(&FileObject->Event,
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Executive,
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PreviousMode,
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FileObject->Flags & FO_ALERTABLE_IO,
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NULL);
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Status = FileObject->FinalStatus;
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}
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}
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/* Return the Status */
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return Status;
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}
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/* EOF */
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