Re: [PATCH 2/2] rpc.nfsd: Allow v4.2 server support with the -V option

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On Tue, 2013-07-30 at 11:59 -0400, J. Bruce Fields wrote:
> On Sun, Jul 28, 2013 at 02:36:38PM -0400, Steve Dickson wrote:
> > Signed-off-by: Steve Dickson <steved@xxxxxxxxxx>
> 
> I agree that we want to be able to turn on 4.2 support with -V, but this
> does more than that:
> 
> > -	if (minorvers41)
> > -		off += snprintf(ptr+off, sizeof(buf) - off, "%c4.1",
> > -				minorvers41 > 0 ? '+' : '-');
> > +	for (n = NFS4_MINMINOR; n <= NFS4_MAXMINOR; n++) {
> > +		if (NFSCTL_VERISSET(minorvers, n)) 
> > +			off += snprintf(ptr+off, sizeof(buf) - off, "+4.%d ", n);
> > +		else			
> > +			off += snprintf(ptr+off, sizeof(buf) - off, "-4.%d ", n);
> > +	}
> >  	for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
> >  		if (NFSCTL_VERISSET(ctlbits, n))
> >  		    off += snprintf(ptr+off, sizeof(buf) - off, "+%d ", n);
> 
> Previously minorvers41 could be set to:
> 
> 	 1: turn on 4.1
> 	-1: turn off 4.1
> 	 0: keep kernel default (user didn't specify)
> 
> This patch removes the "0" case, which I liked.

Why should NFSv4 minor versions be treated any differently from major
versions here? We don't have a 'kernel default' for NFSv2 or v3 or v4.0.

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com
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