RFC: changing the default NFSv4 minor version?

[Alan Somers]

On Thu, May 13, 2021 at 5:02 PM Rick Macklem <rmacklem at uoguelph.ca> wrote:

> Hi,
>
> I believe that NFSv4.1 and NFSv4.2 are now mature in freebsd-current/main.
> I also believe that NFSv4.1/4.2 is a better protocol than NFSv4.0.
> (In particular, the sessions mechanism for "exactly once RPC semantics"
>  is a significant improvement over the duplicate request cache for NFSv4.0,
>  plus other improvements.)
>
> Right now, the FreeBSD NFSv4 client will use NFSv4.0 unless the
> "minorversion" mount option is used to set the minor version to 1 or 2.
>
> The Linux client uses the highest minor version supported by both
> client and server by default.
> I'd like to propose that the default behaviour of the FreeBSD client
> be changed to do the same, so that NFSv4.1/4.2 will be used when possible.
> --> The "minorversion" mount option could still be used to override the
>       above default.
>
> I have hesitated doing this change because it could be considered a POLA
> violation, but I think the change from 4.0->4.1/4.2 will normally be a
> neutral to positive experience. (To be honest, I suspect most won't notice
> the change.)
>
> How do others feel about this change?
>
> rick
>

+1