Create a file object in device driver filter routine?

[Laura Ren]

Hi everyone,
I need to do data mirror: backup files under the protected folder on client to server or another folder on client. when there are some changes to those files then just backup the changed part.

so I intend to write a kernal device driver filter. BUT if there a new file created in the protected folder. i need to create a same name file under the other folder too,
HOW can i create a new fileobject in the driver routine?

Thanks in advance!