VOID __stdcall FsRtlTruncateLargeMcb(_LARGE_MCB *Mcb, INT64 LargeVbn){ ExAcquireFastMutex(Mcb->GuardedMutex); FsRtlTruncateBaseMcb(&Mcb->BaseMcb, LargeVbn); KeReleaseGuardedMutex(Mcb->GuardedMutex); }