UINT8 __stdcall FsRtlLookupLastLargeMcbEntryAndIndex(_LARGE_MCB *Mcb, INT64 *LargeVbn, INT64 *LargeLbn, UINT64 *Index){
char v8;
ExAcquireFastMutex(Mcb->GuardedMutex);
FsRtlLookupLastBaseMcbEntryAndIndex(&Mcb->BaseMcb, LargeVbn, LargeLbn, Index);
LOBYTE(Index) = v8;
KeReleaseGuardedMutex(Mcb->GuardedMutex);
return(unsigned __int8)Index;
}