typedef struct _MBCB
{
     SHORT NodeTypeCode;
     SHORT NodeIsInZone;
     ULONG PagesToWrite;
     ULONG DirtyPages;
     ULONG Reserved;
     LIST_ENTRY BitmapRanges;
     INT64 ResumeWritePage;
     BITMAP_RANGE BitmapRange1;
     BITMAP_RANGE BitmapRange2;
     BITMAP_RANGE BitmapRange3;
} MBCB, *PMBCB;

Windows Vista Kernel Structures