For any "-fstype=foofs" option to work, automount/autofs must be able
to find a corresponding method implementation module in its module
directory ("/usr/lib/autofs" by default, unless RedHat changed it).
Other modules also implement the various map lookup schemes ('file',
'program', 'yp', etc.).
The modules themselves are shared libraries with names like
"/usr/lib/autofs/mount_smbfs.so". I expect that they need to be
matched pretty carefully with autofs/automount, although I don't
know of any specific versioning issues.
Mark Carmichael "Adobe's phone bill, my opinions."