FYI, we noticed the below changes on

git://git.infradead.org/users/hch/pnfs.git pnfs-testing
commit 418f5019f1a8cd6fc50db11303e5a9297522d814 ("nfs: force version 4.1")

Our test script uses the following command line:

$ mount.nfs -o v3,nolock <nfs service> <directory>

And found something as follow in the stderr after the commit

mount.nfs: an incorrect mount option was specified

Thanks,
Huang, Ying