Help Needed

For my project (main memory DBMS), I hv written a main memory filesystem.
Idea is, the primary copy of data will reside in main memory. (Workable
only for small size data, at most 2GB).

Now, I want to plug this filesystem with Postgres, so that, instead of
Unix filesystem, this main memory filesystem(MMFS) will now store the
data.

I want to know, how to plug it with Postgres. i.e. whether replacing all
calls to Unix filesystem by calls to MMFS is enough, or do I need to do
something else/more. I am really a newbie to Postgres. So, can someone pls
guide me, abt how should I go.

_________________________________
Ameya S Sakhalkar,
Sr. Postgraduate Student, CSE,
C-720, H12, IIT Bombay.
email: ameya(at)cse(dot)iitb(dot)ac(dot)in
Phone: 9892252239
Visit me at:
http://www.cse.iitb.ac.in/~ameya