Re: [PATCH/RFC nfs-utils] exports.man: improve documentation of 'nohide' and 'crossmnt'

[NeilBrown <neilb@suse.de>]

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On Mon, 16 Feb 2015 15:17:51 -0500 bfields@fieldses.org (J. Bruce Fields)
wrote:

> On Mon, Feb 16, 2015 at 12:21:07PM +1100, NeilBrown wrote:
> > 
> > 
> > - note that 'nohide' is irrelevant for NFSv4
> > - note that children on a 'crossmnt' filesystem cannot be unexported
> > - note that 'nocrossmnt' is a valid option, but probably not useful.
> > 
> > Signed-off-by: NeilBrown <neilb@suse.de>
> > 
> > ---
> > 
> > I wonder if we should add a new option, e.g. "noaccess" so that children
> > of a "crossmnt" filesystem can be hidden.  The  kernel wouldn't need to
> > know about this.  It would just tell mountd to refuse to export that
> > filesystem even if the parent was "crossmnt".
> > ??
> 
> Seems logical enough, but I can't recall seeing requests for it, and
> the options here already seem complicated enough.

I haven't seem requests myself.  Just rumours of 'nohide' not working with
NFSv4, which seems to suggest that someone wants something like that.
But I cannot find a clear source.

Maybe:

http://ubuntuforums.org/showthread.php?t=2152643
http://ubuntuforums.org/showthread.php?t=1603881


> 
> In theory something like that could also be done with namespaces.  (So,
> run mountd in a separate mount namespace that lacks those children.)

Do any of the NFS man pages need to be updated to say something about
namespaces?

NeilBrown


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