From owner-freebsd-stable  Wed Jun  3 11:51:23 1998
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From: "Kazuhiko KAWAKAMI" <kazz-0@ca2.so-net.ne.jp>
To: <stable@FreeBSD.ORG>
Subject: Bug in mount_union 
Date: Thu, 4 Jun 1998 03:50:30 +0900
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I found a bug in mount_union of 2.2-stable.

In mount_union.8, there are the examples :

(1)
    mount -t cd9660 -o ro /dev/cd0a /usr/src
    mount -t union -o /var/obj /usr/src

(2)
    mount -t union -o -b /sys $HOME/sys

But

(1) It is not work.

(2) I can mount union filesystem, and tested like this: 

    % mount -t cd9660 -o ro /dev/cd0a /cdrom
    % mount -t union -o -b /cdrom /usr/src
    % cd /usr/src
    % touch a
    % rm a

    I got a panic message.


In mount.8, I found '-o union' option, and tried to use.

    % mount -t cd9660 -o ro /dev/cd0a /usr/src
    % mount -o union /dev/fd0a /usr/src
    % cd /usr/src
    % touch a
    % rm a

    It worked.





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