Consider this series an RFC. While working on the recent hardening
patches for the nfsd listener netlink interface, Chuck mentioned that we
could allow userland to handle rpcbind registation itself.

This adds such a mechanism to the netlink listener set interface. The
main idea is to add a new optional flag to the netlink downcall that
tells the kernel to skip rpcbind registration altogether for the nfsd
listeners.

Note that NLM registration is not affected and is still handled by the
kernel.  Handling that is trickier since it can be started by the
client.

Patches to nfsdctl will follow.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Jeff Layton (5):
      SUNRPC: allow a service to opt out of rpcbind registration
      NFSD: add a userspace-rpcbind flag to listener_set
      NFSD: honour the userspace-rpcbind flag in listener_set
      NFSD: report registerable programs in the listener_set reply
      selftests/nfsd: exercise the userspace-rpcbind listener_set flag

 Documentation/netlink/specs/nfsd.yaml              |  55 +++-
 fs/nfsd/netlink.c                                  |   5 +-
 fs/nfsd/nfsctl.c                                   | 162 +++++++++++-
 fs/nfsd/nfsd.h                                     |   4 +-
 fs/nfsd/nfssvc.c                                   |  67 +++--
 include/linux/sunrpc/svc.h                         |   2 +
 include/uapi/linux/nfsd_netlink.h                  |  20 ++
 net/sunrpc/svc.c                                   |   5 +
 net/sunrpc/svc_xprt.c                              |   2 +-
 .../testing/selftests/nfsd/nfsd_netlink_listener.c | 284 ++++++++++++++++++++-
 10 files changed, 571 insertions(+), 35 deletions(-)
---
base-commit: 5965280c53faff01983ccf89de70a5d48318f035
change-id: 20260903-nfsd-norpcb-21cdcaf246bb

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>