efs versus gnu emacs 21.3

I've started looking into efs 1.20 (the latest version I could find
online).  But, I use gnu emacs 21.3 and not xemacs.  When I started
trying to compile efs for gnuemacs 21.3, I immediately ran into a few
functions that were causing problems:

        user-home-directory             not in 21.3
        dired-call-process              not in 21.3
        abbreviate-file-name            fewer args in 21.3
        directory-files                 fewer args in 21.3

Before I dive in and provide replacements for these, I thought I'd ask
if anyone else had already done the work and was willing to share it?

My underlying reason for looking into efs is more complicated.  At
work, I need to work with many files on a windows file server and I
was hoping that, after getting efs working properly, it would be
reasonable to make it understand how to use smbclient to talk to
windows boxes.  smbclient is similar but not identical to ftp clients
at the command level.  If anyone has thoughts on how realistic this
idea is, I'd be very interested in hearing them.

Thanks in advance, 

Dale Hagglund.