Limiting bandwidth and disk quota per user

hello guys, i'm new to this forum and here's my situation.

I have a 100mbit FD connection with 1tb of hdd, running on Ubuntu 11.10.
I would like to add 4 users in a way so each one will be able to use only 10mbit and 150gb .

is it possible in anyway?
could you please not refer me to google, i've been there and got to no where.

i'm here because my searches came out with no actual solution.
i would really appreciate that if you helped me

thank you very much !!