[PATCH nfs-utils v2 0/4] nfsdctl: properly handle older kernels that don't support min-threads

[Jeff Layton <jlayton@kernel.org>]

Ben reported a problem with using new userland with old kernel. If he
tried to send down a setting that the kernel doesn't support, it returns
-EINVAL to the call.

This patch series adds a mechanism for nfsdctl to tell what attributes
are supported by the "threads" command. If can then use that to
determine whether to pass down the min-threads attribute or report an
error or warning.

This also removes the dependency on the UAPI headers by properly
maintaining the private nfsd_netlink.h file.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v2:
- Add patch to unconditionally compile in min-threads support
- Make getpolicy_handler() return NL_SKIP
- Link to v1: https://lore.kernel.org/r/20260204-minthreads-v1-0-9f348608f884@kernel.org

---
Jeff Layton (4):
      nfsdctl: unconditionally enable support for min-threads
      nfsdctl: only resolve netlink family names once
      nfsdctl: query netlink policy before sending the minthreads attribute to kernel
      nfsdctl: remove unneeded newlines from xlog() format strings

 configure.ac                 |   6 +-
 utils/nfsdctl/nfsd_netlink.h |   2 +
 utils/nfsdctl/nfsdctl.c      | 204 ++++++++++++++++++++++++++++++++++---------
 3 files changed, 168 insertions(+), 44 deletions(-)
---
base-commit: 8f54511aefe1455161a6c4406ed8c770139f61e3
change-id: 20260203-minthreads-402ce87096e0

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