typedef struct _DEFERRED_WRITE
{
     SHORT NodeTypeCode;
     SHORT NodeByteSize;
     PFILE_OBJECT FileObject;
     ULONG BytesToWrite;
     LIST_ENTRY DeferredWriteLinks;
     PKEVENT Event;
     PVOID PostRoutine;
     PVOID Context1;
     PVOID Context2;
     UCHAR LimitModifiedPages;
} DEFERRED_WRITE, *PDEFERRED_WRITE;

Windows Vista Kernel Structures