long-term stable backports of NFSD patches

[Chuck Lever <chuck.lever@oracle.com>]

It's apparent that a number of distributions and their customers
remain on long-term stable kernels. We are aware of the scalability
problems and other bugs in NFSD in kernels between v5.4 and v6.1.

To address the filecache and other scalability problems in those
kernels, I'm preparing backported patches of NFSD fixes for several
popular LTS kernels. The backported commits are destined for the
official LTS kernel branches so that distributions can easily
integrate them into their products.

Once this effort is complete, Greg and Sasha will continue to be
responsible for backporting NFSD-related fixes from upstream into
the LTS kernels.

Here's a status update.

---

I've pushed the NFSD backports to branches in this repo:

https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git

If you are able, I encourage you to pull these, review them or try
them out, and report any issues or successes. I'm currently using
the NFS workflows in kdevops as the testing platform, but am
planning to include other tests.


LTS v6.1.y

Additional patches were tested and sent to Greg and Sasha this
week. Sasha has merged them into linux-6.1.y for release soon.

Meanwhile, you can find these patches in the "nfsd-6.1.y" branch in
the above repo.


LTS v5.15.y

This branch was rebased on linux-5.15.152 and has completed
testing. I'm investigating some failures in the ltp net.nfs group
but it looks like these are all related to NFSv4.2.

You can find these patches in the "nfsd-5.15.y" branch in the above
repo.


LTS v5.10.y

This branch was rebased on linux-5.10.213. Testing will commence
once nfsd-5.15.y has been sent to Greg and Sasha.

You can find these patches in the "nfsd-5.10.y" branch in the above
repo.

-- 
Chuck Lever