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Date: Thu, 27 Jul 1995 16:02:09 -0700
From: jmacd@uclink.berkeley.edu (Joshua Peck Macdonald)
Message-Id: <199507272302.QAA08193@uclink.berkeley.edu>
To: hackers@FreeBSD.org
Subject: unionfs
Sender: hackers-owner@FreeBSD.org
Precedence: bulk


does unionfs work?

I just tried mounting a CD and union mounting another filesystem
on top of it, following the directions in the man page for mount_union.
I mounted /dev/cd0a on /usr/src and then did
mount -t union /usr/obj /usr/src and now df reports:
/dev/sd1a           34111    12282    19100    39%    /
/dev/sd1s2f        306321   134405   147410    48%    /home
/dev/sd1s2e        297423   108517   165112    40%    /usr
/dev/sd0s4e        304618   227217    62170    79%    /usr/local
/dev/sd0s4a         15034     1851    12431    13%    /mnt
procfs                  4        4        0   100%    /proc
/dev/cd0a          613384   613384        0   100%    /usr/src
<above>/usr/obj    910807   721901   165112    81%    /usr/src

and there is nothing showing in /usr/src, nor can I figure out how
to umount it either.  because if I change directories to /usr/src
it says I'm in /usr/obj and umount /usr/src says /usr/obj isn't 
mounted.

-josh