Writing Preoperation and Postoperation Callback Routines
In this article. In its DriverEntry routine, a minifilter driver can register up to one preoperation callback routine and up to one postoperation callback routine for each type of I/O operation that it needs to filter.. Unlike a legacy file system filter driver, a minifilter driver can choose which types of I/O operations to filter. A minifilter driver can register a preoperation …