This version just fixes up some errno handling confusion that was in v3 that Chuck pointed out. This version also drops ENAVAIL as a special error code -- we can use EIO for that instead.
Please consider these for v7.4. Signed-off-by: Jeff Layton <[email protected]> --- Changes in v4: - Use EIO instead of ENAVAIL to represent an unrecoverable rpcbind error - Link to v3: https://lore.kernel.org/r/[email protected] Changes in v3: - Dropped v2's patch 4, the svc_register() unwind. rpcbind matches an UNSET on [program, version, netid], and the v2 fallback ignores the protocol completely. The unwind could therefore clear entries that belong to other live listeners. Chuck Lever found that. - A failed registration stays fatal. Patch 3 makes CONFIG_NFS_LOCALIO=y agree with CONFIG_NFS_LOCALIO=n on that point. - Tests: sem_register_refused now reads the listener set back, because -EACCES alone does not show that no listener was created. sem_create_failure_extack is new. The netlink socket now asks for NETLINK_EXT_ACK and NETLINK_CAP_ACK, so that a test can read the extack. - Tests: FIXTURE_TEARDOWN removes any listener or thread that a test left behind. Those pinned the netns. - Stop attempting to register any more listeners when the first svc_register() call fails. - Bound the unregistration side the same way. svc_register(), svc_unregister() and the per-listener teardown in svc_delete_xprt() all give up once the local rpcbind stops answering, so one listener_set pays one timeout in each direction rather than one per listener. - Link to v2: https://lore.kernel.org/r/[email protected] Changes in v2: - New patch 4: when a later registration failed, svc_register() left the entries that it had already set in rpcbind. Those entries pointed at a port that the caller then closed. - Tests: behavioural fixes for several tests. Several assertions checked only an errno that both the fixed kernel and the broken kernel return. val_bad_transport() now also requires that the rpcbind stub saw no traffic. val_second_entry_bad() requires that no listener started. func_empty_destroys requires that the kernel dropped the local rpcbind client and then connected again. The two -EBUSY tests require that the listener set does not change. find_listener() now matches the address too. - Tests: the stub read the revents of a newly accepted pollfd that poll() had not written. The stub could therefore start a blocking read with no readiness event. - Tests: the config fragment now includes NAMESPACES, SHMEM, TMPFS and UNIX. Without them, every test skipped. - Link to v1: https://lore.kernel.org/r/[email protected] --- Jeff Layton (14): NFSD: cap the number of listeners accepted in listener_set NFSD: validate transport name in listener_set before serv creation SUNRPC: keep the first error in svc_register() SUNRPC: bound the local rpcbind client timeout to 1s NFSD: report listener creation failures through extack SUNRPC: report local rpcbind calls that get no answer SUNRPC: stop svc_register() once rpcbind stops answering SUNRPC: stop the svc_unregister() sweep once rpcbind stops answering SUNRPC: stop unregistering listeners once rpcbind stops answering NFSD: stop registering with rpcbind after a failure in listener_set selftests/nfsd: exercise listener_set request validation selftests/nfsd: add a per-netns rpcbind stub and the listener round-trips selftests/nfsd: check that listener_set asks rpcbind once selftests/nfsd: check that listener removal asks rpcbind once MAINTAINERS | 1 + fs/nfsd/nfsctl.c | 87 +- include/linux/sunrpc/clnt.h | 3 +- include/linux/sunrpc/svc.h | 7 +- net/sunrpc/rpcb_clnt.c | 33 +- net/sunrpc/svc.c | 65 +- net/sunrpc/svc_xprt.c | 20 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/nfsd/.gitignore | 1 + tools/testing/selftests/nfsd/Makefile | 6 + tools/testing/selftests/nfsd/config | 8 + .../testing/selftests/nfsd/nfsd_netlink_listener.c | 1328 ++++++++++++++++++++ tools/testing/selftests/nfsd/settings | 1 + 13 files changed, 1540 insertions(+), 21 deletions(-) --- base-commit: e247236b7ffa1e0940f834787feade8570c5db91 change-id: 20260717-nfsd-nl-hang-10a3b3e93f2a Best regards, -- Jeff Layton <[email protected]>
