On Fri, Oct 07, 2005 at 12:17:43PM -0400, Steve Dickson wrote:
> Here is a kernel patch that will enable the setting
> of the port knfsd will listens on, the transport knfsd
> will support and which NFS version will be advertised.
>
> The nfs-utils patch, which is also attached, will added
> the following flags to rpc.nfsd that will enable the kernel
> functionality (Note: These patches are NOT dependent on each
> other. Meaning rpc.nfsd and knfsd will still function correctly
> if one or the other patch do or do not exist):
>
>
> -N or --no-nfs-version vers
> This option can be used to request that rpc.nfsd does not offer
> certain versions of NFS. The current version of rpc.nfsd can
> support both NFS version 2,3 and the newer version 4.
So the obvious question is what will happen if someone does
rpc.nfsd -N 3
on a server supporting 2, 3, and 4.
It looks like the code in svc_create() will set pg_lovers to 2 and
pg_hivers to 4 in that case. So if someone tries to use version 3, the
error they get back will be a somewhat contradictory "sorry, I only
support versions 2 through 4."
It seems to me that it'd be cleaner if the kernel interface only
accepted a range (e.g., "2--4" or "2--3"). Then if someone
attempted the above, they'll get an error back immediately.
Or svc_create could be adjusted to report a more conservative range
("2--2" or "4--4" instead of "2--4").
But I don't have really strong feelings about it. Maybe we shouldn't
care enough about that case.
--b.
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