FYI, none of the Dax code even needs to ever touch the dio_count, as dax I/O can't be asynchronous, and we thus don't need it to protect against truncate. I'd suggest to remove it and then end_io callback from the DAX code entirely as a start and then move from there. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html