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Date:      Wed, 5 May 1999 09:30:15 +0400 (MSD)
From:      "Sergey Ayukov (mailing lists)" <asv1@crydee.sai.msu.ru>
To:        questions@FreeBSD.ORG
Subject:   Re: NFSD limitations?
Message-ID:  <Pine.BSF.4.05.9905050918330.25620-100000@crydee.sai.msu.ru>
In-Reply-To: <Pine.BSF.4.03.9905041502130.28350-100000@resnet.uoregon.edu>

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On Tue, 4 May 1999, Doug White wrote:

> > > > 1) I can't export directories which are not local mount point. E.g., I
> > > > have disk mounted on /vol1 and want to export only /vol1/ftp . Is this
> > > > possible (if I try to export /vol1/ftp/.1, mountd complains about wrong
> > > > mount point)? Even worse, I need to export /var/spool for pcnsfd printing,
> > > > but don't want to export entire /var. In my case, /var is on separate
> > > > partition.
> > > 
> > > It can be done.  Try using the '-alldirs' flag first; this will let you
> > > mount /vol1 and any subtree, including /vol1/ftp.
> > 
> > No, my point was to limit the export. In other words, I don't want to
> > export entire /var or /vol1, just parts of them (which are not
> > mountpoints).
> 
> I think there is a way to do this using overlapping specifications (/usr
> then /usr/local), but I'm not sure.

It does not work. I have tried 

/var		c.room44.net
/var/spool	-alldirs	-network 195.208.220

(room44.net is 10.0.0.0 network, on crossover cable) and mountd complains:

could not remount /var/spool: Invalid argument
bad exports list line /var/spool -alldirs -network 195.208.220

There were no more references to /var in the /etc/exports. It is possible
to do the following:

/var /var/spool -network 195.208.220

but then my /var gets exported to the entire network and it is not what I
want!
 
> > > > 2) NFS mount does not seem to go through local filesystems. E.g., I have 
> > > > another disk mounted on /vol1/ftp/.1 and want export of /vol1/ftp to
> > > > transparently "bleed" through to /vol1/ftp/.1 ?
> > > 
> > > NFS mounts do not cross mountpoints.  You'll have to mount that yourself.
> > 
> > Pity. That results in two additional drive letters :-( Ugly.
> 
> This isn't to say you can't mount an NFS partition on top of a
> mountpoint on another NFS mount.  I'd have to test this.

Fortunately, I don't need this functionality under Unix (DOS and OS/2
apparently cannot mount anything on directories, only on new drive
letters).

---------------------------------------------------------------------------
Dr. Sergey Ayukov                          Sternberg Astronomical Institute
http://www.ayukov.com                                        Moscow, Russia
http://crydee.sai.msu.ru/index-asv.html



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