VOID __stdcall FsRtlTruncateLargeMcb(PLARGE_MCB Mcb, _LONGLONG LargeVbn){ ExAcquireFastMutex(Mcb->GuardedMutex); FsRtlTruncateBaseMcb(&Mcb->BaseMcb, LargeVbn); KeReleaseGuardedMutex(Mcb->GuardedMutex); }