intercept file open system call

Submitted by appas
on July 21, 2004 - 10:10pm

Hi,
I want to write a linux module which should intercept Open file system call but should not intervene the underlying file system driver ( for eg. ext3 ). ie My module as well as linux file system driver (ext3) both should receive the file open system call.
Can anyone let me know how to start the proceedings.