[PATCH RFC nfs-utils v2 00/10] nfsdctl: allow it to handle rpcbind registration and deregistration

[Jeff Layton <jlayton@kernel.org>]

This version fixes some problems that Sashiko flagged in review.

This patchset adds support for NFSD_A_SERVER_SOCK_USERSPACE_RPCBIND,
which tells the kernel to not do rpcbind registration and to instead
allow userland to handle it. After setting listeners, nfsdctl will then
call out to rpcbind using the normal libtirpc client interfaces.

This is a companion set to the kernel set I recently posted (and which
also should have been marked RFC).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v2:
- Fixes for bugs v1 introduced are folded into the patches that
  introduced them. Three pre-existing bugs found along the way are
  separate patches at the end, so the set is 10 patches instead of 7.
- "register nfsd listeners with rpcbind": register only once the
  listener_set reply has been parsed. On a reply carrying no rpcbind
  attributes the sweep cleared every NFS and NFSACL entry and put
  nothing back, leaving a running server advertising nothing. Also
  abort rather than send a listener_set that lost the ownership flag.
- "clear rpcbind entries when the serv is torn down" (was "... when the
  last thread stops"): also sweep on the autostart teardown path.
- New, pre-existing: fix a heap overflow in autostart_func(). A failed
  listener set zeroed the pool count before the thread array was sized,
  but the array is filled from the nfs.conf list, so any [nfsd] threads
  setting wrote past the allocation.
- New, pre-existing: reject a listener insertion when the table is full,
  instead of writing one element past nfsd_sockets[].
- New, pre-existing: check the nla_put() calls in set_listeners().
- Link to v1: https://lore.kernel.org/r/20260910-nfsdctl-rpcb-v1-0-4bba1e7a3a43@kernel.org

---
Jeff Layton (10):
      nfsdctl: sync nfsd_netlink.h with the kernel
      nfsdctl: probe the policy of any command
      nfsdctl: share the listener nest parser
      nfsdctl: add rpcbind registration helpers
      nfsdctl: register nfsd listeners with rpcbind
      nfsdctl: clear rpcbind entries when the serv is torn down
      nfsdctl: add missing break in update_listeners()
      nfsdctl: fix heap overflow in autostart_func() listener cleanup
      nfsdctl: reject a listener insertion when the table is full
      nfsdctl: check the netlink attribute puts in set_listeners()

 configure.ac                   |   2 +-
 support/include/nfsd_netlink.h |  18 +++
 utils/nfsdctl/Makefile.am      |  10 +-
 utils/nfsdctl/nfsdctl.8        |  16 +++
 utils/nfsdctl/nfsdctl.adoc     |  17 +++
 utils/nfsdctl/nfsdctl.c        | 256 +++++++++++++++++++++++++++++++++--------
 utils/nfsdctl/rpcbind.c        | 251 ++++++++++++++++++++++++++++++++++++++++
 utils/nfsdctl/rpcbind.h        |  42 +++++++
 8 files changed, 562 insertions(+), 50 deletions(-)
---
base-commit: 630393e9c73667b3fda6a7507cb5171ec0ec38dc
change-id: 20260908-nfsdctl-rpcb-adc5a1fc090b

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