#ifndef _NTTMAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
NtFreezeTransactions(
    _In_ PLARGE_INTEGER FreezeTimeout,
    _In_ PLARGE_INTEGER ThawTimeout
    );

#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwFreezeTransactions(
    _In_ PLARGE_INTEGER FreezeTimeout,
    _In_ PLARGE_INTEGER ThawTimeout
    );

#endif
View code on GitHub