file operation in file system filter driver

i want to operate a file(open,delete,read …etc) in my file system filter driver. how can i do? Maybe i should allocate a Irp and send it to fsd .but i don’t know the right way.
Thanks in advance

yang yanming
???y˫???+.n?+???~?Z?˛??^r*D???kN???r??zǧu??jy???^j??? 0?j?b??(??(