Re: Adding a new export option

On Mon, 2010-01-04 at 16:04 -0500, J. Bruce Fields wrote:
> On Mon, Jan 04, 2010 at 03:58:24PM -0500, Steve Dickson wrote:
> > 
> > 
> > On 01/04/2010 03:31 PM, David P. Quigley wrote:
> > > I remember a while back hearing something about the export code being
> > > rewritten. Was that the case or was I misremembering something else? I
> > > want to add a new export option for Labeled NFS and I've been crawling
> > > through the existing export code. If it is going to be changed I'll hold
> > > off on this for now otherwise I'll keep working on it. Also looking at
> > > the security flavor code it looks like those values get converted from a
> > > string into a number. Is there a good example of an export option that
> > > passes a complete string to the kernel?
> 
> You could look at fsloc or uuid.
> 
> > I would wait a bit until we get the pseudo code ironed out... 
> > I believe we have the kernel code set and Bruce is about to post
> > some mountd code that will complete the picture... Hopefully this will
> > be all set by the EOW... 
> 
> Yes.  There aren't any changes to the kernel export parsing code (e.g.,
> svc_export_parse()), though, so it may be independent from your changes.
> 
> What were you thinking your new option would look like?
> 
> --b.

So basically in Labeled NFS we currently use the LSM framework to parse
and set labels on the files on the server. One of the operation modes is