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From: sahayman@porbeagle.cs.indiana.edu (Steve Hayman)
Newsgroups: comp.unix.internals
Subject: Re: hiding files under a mount point.
Message-ID: <1991Mar20.131908.18569@news.cs.indiana.edu>
Date: 20 Mar 91 18:18:38 GMT
References: <1991Mar18.045734.5114@brolga.cc.uq.oz.au> <1991Mar19.100615.13770@rtf.bt.co.uk>
Organization: Computer Science, Indiana University, Bloomington.
Lines: 22

> [files hidden under a mount point] can't be used until you umount
> the filesystem.  

Actually you can get at them if you mount the file system which
really contains the hidden files by NFS, and then look around
via NFS.

i.e. you have directory /foo on machine blurfl and file /foo/hidden;
you mount some device on top of /foo and now you can't get to
/foo/hidden any more - BUT - if you nfs-mount blurfl:/ somewhere else,
let's say /nfs/blurfl, then you can quite easily get to
/nfs/blurfl/foo/hidden.  NFS conveniently doesn't follow remote mount
mount points so it just breezes right past the foo directory.

I assume this works on other machines, but I've only tried it
under SunOS 4.1.

Steve
-- 
Steve Hayman    Workstation Manager    Computer Science Department   Indiana U.
sahayman@iuvax.cs.indiana.edu                                    (812) 855-6984
NeXT Mail: sahayman@spurge.bloomington.in.us