IoSynchronousPageWriteEx

NTSTATUS __stdcall IoSynchronousPageWriteEx(
        FILE_OBJECT *FileObject,
        MDL *MemoryDescriptorList,
        LARGE_INTEGER *StartingOffset,
        KEVENT *Event,
        UINT8 IrpSpFlags,
        PVOID IoAttributionContext,
        IO_STATUS_BLOCK *IoStatusBlock){
  _SECTION_OBJECT_POINTERS *SectionObjectPointer; 
  _DEVICE_OBJECT *RelatedDeviceObject; 
  IRP *Irp; 
  int IoPriorityThread; 
  __int64 v15; 
  _ETHREAD *CurrentThread; 
  _LARGE_INTEGER v18; 
  IRP *ReserveIrp; 
  VOID *retaddr; 
  SectionObjectPointer = FileObject->SectionObjectPointer;
  if( SectionObjectPointer && SectionObjectPointer->SharedCacheMap )
  {
    __incgsdword(0x8134u);
    __addgsdword(0x8138u, (MemoryDescriptorList->ByteCount + 4095) >> 12);
  }
  RelatedDeviceObject = IoGetRelatedDeviceObject(FileObject);
  Irp = IopAllocateIrpExReturn(RelatedDeviceObject, *((_BYTE *)RelatedDeviceObject + 76), 0, retaddr);
  if( !Irp )
  {
    if( (unsigned int)MmIsFileObjectAPagingFile(FileObject) )
    {
      _InterlockedIncrement(&IoSynchronousPageWriteIrpAllocationFailure);
      ReserveIrp = IopAllocateReserveIrp(v18, *((_BYTE *)RelatedDeviceObject + 76), 1i64);
    }
    else
    {
      _InterlockedIncrement(&IoSynchronousPageWriteNonPagefileIrpAllocationFailure);
      ReserveIrp = IopAllocateBackpocketIrp(RelatedDeviceObject, *((_BYTE *)RelatedDeviceObject + 76), 0);
    }
    Irp = ReserveIrp;
    if( !ReserveIrp )
      return -1073741670;
  }
  *((_BYTE *)Irp + 71) |= 0x20u;
  *((_QWORD *)Irp + 1) = MemoryDescriptorList;
  *((_DWORD *)Irp + 4) = 67;
  IoPriorityThread = PsGetIoPriorityThread((__int64)KeGetCurrentThread());
  if( IoPriorityThread < 2 )
  {
    CurrentThread = (_ETHREAD *)KeGetCurrentThread();
    if( (*((_DWORD *)CurrentThread + 29) & 0x400) != 0
      || *((_BYTE *)CurrentThread + 562) == 1
      || (*((_BYTE *)KeGetCurrentThread() + 1304) & 0x40) != 0
      || *((_QWORD *)KeGetCurrentThread() + 152) == 2i64 )
    {
      ++IoPagingWriteLowPriorityCount;
    }
    else
    {
      ++IoPagingWriteLowPriorityBumpedCount;
      IoPriorityThread = 2;
    }
  }
  *((_QWORD *)Irp + 9) = IoStatusBlock;
  *((_BYTE *)Irp + 64) = 0;
  *((_QWORD *)Irp + 10) = Event;
  *((_DWORD *)Irp + 4) = ((IoPriorityThread << 17) + 0x20000) | 0x43;
  *((_QWORD *)Irp + 14) = (char *)MemoryDescriptorList->StartVa + MemoryDescriptorList->ByteOffset;
  *((_QWORD *)Irp + 24) = FileObject;
  *((_QWORD *)Irp + 19) = KeGetCurrentThread();
  *(_BYTE *)(v15 - 72) = 4;
  *(_DWORD *)(v15 - 64) = MemoryDescriptorList->ByteCount;
  *(LARGE_INTEGER *)(v15 - 48) = *StartingOffset;
  *(_BYTE *)(v15 - 70) |= IrpSpFlags;
  *(_QWORD *)(v15 - 24) = FileObject;
  if( IoAttributionContext )
    IopSetDiskIoAttributionExtension(Irp, *((_QWORD *)IoAttributionContext + 3));
  else
    IoSetDiskIoAttributionFromThread(Irp, *((_ETHREAD **)Irp + 19));
  IopQueueThreadIrp(Irp);
  return IofCallDriver(RelatedDeviceObject, Irp);
}

Referenced by: