FsRtlPrivateLock

UINT8 __fastcall FsRtlPrivateLock(
        _FILE_LOCK *FileLock,
        _FILE_OBJECT *FileObject,
        _LARGE_INTEGER *FileOffset,
        _LARGE_INTEGER *Length,
        _EPROCESS *ProcessId,
        UINT64 Key,
        UINT8 FailImmediately,
        UINT8 ExclusiveLock,
        _IO_STATUS_BLOCK *Iosb,
        _IRP *Irp,
        VOID *Context,
        UINT8 AlreadySynchronized){
  UINT64 *v16; 
  char *LockInformation; 
  unsigned __int64 QuadPart; 
  LONGLONG v19; 
  KIRQL v20; 
  INT64 v21; 
  CHAR v22; 
  _IO_STATUS_BLOCK *v23; 
  _QWORD *v24; 
  int v26; 
  KIRQL NewIrql; 
  UINT8 v28; 
  char v29; 
  int v30; 
  char *v31; 
  UINT64 *v32; 
  __int128 v33; 
  __int128 v34; 
  __int128 v35; 
  __int64 v36; 
  v29 = 0;
  v31 = 0i64;
  v16 = 0i64;
  v32 = 0i64;
  NewIrql = -1;
  v33 = 0i64;
  v34 = 0i64;
  v35 = 0i64;
  LockInformation = (char *)FileLock->LockInformation;
  v31 = LockInformation;
  if( !LockInformation )
  {
    if( !FsRtlPrivateInitializeFileLock(FileLock, Irp == 0i64) )
      goto LABEL_14;
    FileLock->FastIoIsQuestionable = 1;
    LockInformation = (char *)FileLock->LockInformation;
    v31 = LockInformation;
  }
  QuadPart = FileOffset->QuadPart;
  *(_QWORD *)&v33 = QuadPart;
  v19 = Length->QuadPart;
  *((_QWORD *)&v33 + 1) = v19;
  *((_QWORD *)&v35 + 1) = QuadPart + v19 - 1;
  DWORD1(v34) = Key;
  *((_QWORD *)&v34 + 1) = FileObject;
  *(_QWORD *)&v35 = ProcessId;
  LOBYTE(v34) = ExclusiveLock;
  v16 = (UINT64 *)(LockInformation + 24);
  v32 = (UINT64 *)(LockInformation + 24);
  if( *((_QWORD *)&v35 + 1) < QuadPart && v19 )
  {
    v23 = Iosb;
    Iosb->Status = -1073741407;
    goto LABEL_10;
  }
  v29 = 1;
  KeAcquireSpinLockRaiseToDpc((UINT64 *)LockInformation + 3, QuadPart);
  NewIrql = v20;
  v21 = (INT64)(LockInformation + 24);
  if( ExclusiveLock )
    v22 = FsRtlPrivateCheckForExclusiveLockAccess(v21, (LARGE_INTEGER *)&v33);
  else
    v22 = FsRtlPrivateCheckForSharedLockAccess(v21, (__int64)&v33);
  if( v22 )
  {
    if( FsRtlPrivateInsertLock(LockInformation, (__int64)FileObject, &v33) )
    {
      v23 = Iosb;
      Iosb->Status = 0;
LABEL_10:
      v28 = 1;
      goto LABEL_29;
    }
    if( Irp )
    {
      KeReleaseSpinLock((UINT64 *)LockInformation + 3, NewIrql);
      RtlRaiseStatus(-1073741670);
    }
  }
  else
  {
    if( FailImmediately )
    {
      v23 = Iosb;
      Iosb->Status = -1073741739;
      goto LABEL_10;
    }
    if( Irp )
    {
      LODWORD(v24) = ExAllocateFromNPagedLookasideList((NPAGED_LOOKASIDE_LIST *)FsRtlWaitingLockLookasideList);
      if( !v24 )
      {
        KeReleaseSpinLock((UINT64 *)LockInformation + 3, NewIrql);
        RtlRaiseStatus(-1073741670);
      }
      v24[3] = Irp;
      v24[2] = Context;
      v24[1] = *((_QWORD *)LockInformation + 1);
      v36 = *((_QWORD *)Irp + 23);
      *(_BYTE *)(v36 + 3) |= 1u;
      *v24 = 0i64;
      if( *((_QWORD *)LockInformation + 6) )
        **((_QWORD **)LockInformation + 7) = v24;
      else
        *((_QWORD *)LockInformation + 6) = v24;
      *((_QWORD *)LockInformation + 7) = v24;
      *((_QWORD *)Irp + 7) = LockInformation;
      _InterlockedExchange64((volatile __int64 *)Irp + 13, (__int64)FsRtlPrivateCancelFileLockIrp);
      if( *((_BYTE *)Irp + 68) && _InterlockedExchange64((volatile __int64 *)Irp + 13, 0i64) )
      {
        *((_BYTE *)Irp + 69) = NewIrql;
        FsRtlPrivateCancelFileLockIrp(0i64, Irp);
        v29 = 0;
      }
      v23 = Iosb;
      Iosb->Status = 259;
      LockInformation = v31;
      v16 = v32;
      goto LABEL_10;
    }
  }
LABEL_14:
  v28 = 0;
  v23 = Iosb;
LABEL_29:
  if( v29 )
  {
    KxReleaseSpinLock(v16);
    __writecr8(NewIrql);
  }
  if( Irp && v23->Status != 259 )
  {
    v30 = 0;
    ObfReferenceObjectWithTag(FileObject, 0x746C6644u);
    FsRtlCompleteLockIrpReal(
      *((__int64(__fastcall **)(__int64, __int64))LockInformation + 1),
      (__int64)Context,
      (__int64)Irp,
      v23->Status,
      &v30,
      (__int64)FileObject);
    v26 = v30;
    if( v30 < 0 && v23->Status >= 0 )
      FsRtlPrivateRemoveLock((__int64)LockInformation, (__int64)&v33, 1);
    ObfDereferenceObjectWithTag(FileObject, 0x746C6644ui64);
    v23->Status = v26;
  }
  return v28;
}

Referenced by: