From: Neil Brown <neilb@suse.de>
Subject: Re: [PATCH] Allow default options in /etc/exports
Date: Wed, 7 Feb 2007 17:30:25 +1100
Message-ID: <17865.29185.322808.952798@notabene.brown>
References: <20061226225848.GA18366@uio.no>
	<17862.31691.37417.435244@notabene.brown>
	<20070205004844.GA6459@uio.no> <20070207022812.GB27634@sgi.com>
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Cc: "Steinar H. Gunderson" <sgunderson@bigfoot.com>,
	nfs@lists.sourceforge.net
To: Greg Banks <gnb@sgi.com>
In-Reply-To: message from Greg Banks on Wednesday February 7
Sender: nfs-bounces@lists.sourceforge.net
Errors-To: nfs-bounces@lists.sourceforge.net

On Wednesday February 7, gnb@sgi.com wrote:
> 
> How about making the line the exact same syntax as normal
> lines but a pseudo export point string which is not a valid
> absolute pathname, something like "defaults".  For example:
> 
> defaults	*(rw,sync,no_subtree_check)
> /foo
> /bar		*(insecure)
> 
> could mean the same as
> 
> /foo		*(rw,sync,no_subtree_check)
> /bar		*(rw,sync,no_subtree_check,insecure)

Thats probably heading in the right direction.
That example you have given sets defaults for a particular client (or
client set).  I was imagining setting defaults for everything.
I guess both could be useful.
Global defaults could be set with

   defaults (rw,sync)

i.e. no client at all.
So if you have


default (rw,sync,no_subtree_check)
default @friends(no_root_squash)

/foo -ro,root_squash @friends()  @enemies(all_squash)

Then what options apply to a mount of /foo from a friend?
Both root_squash and no_root_squash are provided as defaults, one for
the filesystem, one for the client...

I suspect the filesystem default should rule as it is textually
closer.

> 
> There are export options which cannot usefully appear in such a
> defaults line (fsid certainly, perhaps also mountpoint=/somewhere).

Yes, we would need to be careful about that.

NeilBrown

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