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From: luigi@pical2.uucp (Luigi Rizzo)
Newsgroups: comp.unix.bsd
Subject: Re: mountd/portmap/NFS problem -- solved.
Message-ID: <1992Nov7.155354.3562@di.unipi.it>
Date: 7 Nov 92 15:53:54 GMT
References: <1992Nov5.175351.26079@cs.brown.edu>
Sender: netnews@di.unipi.it (USENET News System)
Reply-To: luigi@iet.unipi.it
Organization: Dip. di Ingegneria dell'Informazione, Univ. di Pisa (ITALY)
Lines: 87
Nntp-Posting-Host: pical2.iet.unipi.it
Thanks to all who replied. My problem actually involves two (known)
'features' of mountd and the nfs client code. Portmap seems to be
innocent.
The first bug is related to mountd, and the description is as
follows:
========================================
Bug Number: MISC006
Problem:
mountd hangs when exporting a file system sub-directory
Explanation:
If /etc/exports contained:
/usr/src -root=0
And /usr was not a file system unto itself, mountd went into an
infinite loop and stayed there.
Solution:
The fix: in /usr/src/sbin/mountd/mountd.c, line 592 reads:
while (*cp == '/' && cp > ep->ex_dirp)
and should read:
while (*(cp-1) == '/' && cp > ep->ex_dirp)
PATCH00054
Submitted by:
roe@unibase.sk.ca (Roe Peterson)
Solved by:
(same)
========================================
Unfortunately, the /etc/exports you get with the standard distribution
(bin01) tries to export /usr/bill while the filesystem is /, thus
triggering the bug. Many many people must have had this problem. I
didn't understand it because, at first, I thought the bug would appear
only when a mount request actually arrived. Which is wrong!
The second problem has to do with the remote NFS server requiring
for requests to come from a reserved port. The bug description is as
follows:
========================================
Bug Number: MISC019
Problem:
NFS bugs.
Appending to already existing files.
Read request hangs.
IBM AIX 3.2 client fixes.
reserved ports for NFS.
Subdirectories can be exported.
Explanation:
In the patch.
Solution:
PATCH00016
PATCH00042
PATCH00053
Submitted by:
comp.unix.bsd
root@snowhite.cis.uoguelph.ca (gopher I)
Solved by:
comp.unix.bsd
arnej@Lise.Unit.NO (Arne Henrik Juul)
martin@innovis.com (Martin Galassi)
root@snowhite.cis.uoguelph.ca (gopher I)
============================================
I experienced the problem with Ultrix 4.1. Unfortunately this bug is
particularly bad for me because in order to rebuild the kernel I
need disk space, and I hoped to get it by NFS-mounting a disk from a
big brother... So I'd really appreciate if someone could point me
to a ready-to-run kernel with the NFS patches applied. Same for
a working mountd.
Thanks
Luigi
====================================================================
Luigi Rizzo Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it Universita' di Pisa
tel: +39-50-568533 via Diotisalvi 2, 56124 PISA (Italy)
fax: +39-50-568522
====================================================================