Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!ctrsol!seth
From: seth@ctr.columbia.edu (Seth Robertson)
Newsgroups: comp.unix.wizards
Subject: Re: NFS and UFS Mounting on a non-empty directory
Keywords: Frustration, Yellow Pages
Message-ID: <1989Jul23.194057.4247@ctr.columbia.edu>
Date: 23 Jul 89 19:40:57 GMT
References: <2339@orion.cf.uci.edu> <12921@bloom-beacon.MIT.EDU>
Reply-To: seth@ctr.columbia.edu (Seth Robertson)
Distribution: na
Organization: Center for Telecommunications Research:  Columbia University
Lines: 40

In article <12921@bloom-beacon.MIT.EDU> jik@athena.mit.edu (Jonathan I. Kamens) writes:
>Yes, the concept of mounting over a non-empty directory is
>well-defined
>>     Its
>>     old contents are inaccessible while the file system is
>>     mounted.


The concept may be well defined, but the implementation bytes the big one.

In SunOS 4.0.3

seth elara> cd /mnt
seth elara> ls
testfile
seth elara> cat testfile
This is a test.
seth elara> mount leda:/image /mnt
seth elara> ls
lost+found not found
vdo not found
seth elara> cd vdo
vdo bad directory
seth elara> cat testfile
This is a test.
seth elara> cd /
seth elara> cd /mnt
seth elara> ls
lost_found	vdo
seth elara> cd vdo
seth elara> pwd
/mnt/vdo

(Note:  This is a hand copy of what actually happened, so I may have
screwed up a little on the error messages, but this is, for all intents
and purposes, what happened)

-- 
					-Seth Robertson
					 seth@ctr.columbia.edu