Introduce rpc_status netlink support for NFSD in order to dump pending RPC requests debugging information from userspace. The new code can be tested with the user-space tool reported below: https://github.com/LorenzoBianconi/nfsd-rpc-netlink-monitor/tree/main Changes since v7: - introduce nfsd_server.yaml for netlink messages Changes since v6: - report info to user-space through netlink and get rid of the related entry in the procfs Changes since v5: - add missing delimiters for nfs4 compound ops - add a header line for rpc_status handler - do not dump rq_prog - do not dump rq_flags in hex Changes since v4: - rely on acquire/release APIs and get rid of atomic operation - fix kdoc for nfsd_rpc_status_open - get rid of ',' as field delimiter in nfsd_rpc_status hanlder - move nfsd_rpc_status before nfsd_v4 enum entries - fix compilantion error if nfsdv4 is not enabled Changes since v3: - introduce rq_status_counter in order to detect if the RPC request is pending and RPC info are stable - rely on __svc_print_addr to dump IP info Changes since v2: - minor changes in nfsd_rpc_status_show output Changes since v1: - rework nfsd_rpc_status_show output Changes since RFCv1: - riduce time holding nfsd_mutex bumping svc_serv refcoung in nfsd_rpc_status_open() - dump rqstp->rq_stime - add missing kdoc for nfsd_rpc_status_open() Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=3D3D3D366 Lorenzo Bianconi (3): Documentation: netlink: add a YAML spec for nfsd_server NFSD: introduce netlink rpc_status stubs NFSD: add rpc_status netlink support Documentation/netlink/specs/nfsd_server.yaml | 97 +++++++++ fs/nfsd/Makefile | 3 +- fs/nfsd/nfs_netlink_gen.c | 32 +++ fs/nfsd/nfs_netlink_gen.h | 22 ++ fs/nfsd/nfsctl.c | 204 +++++++++++++++++++ fs/nfsd/nfsd.h | 16 ++ fs/nfsd/nfssvc.c | 15 ++ fs/nfsd/state.h | 2 - include/linux/sunrpc/svc.h | 1 + include/uapi/linux/nfsd_server.h | 49 +++++ 10 files changed, 438 insertions(+), 3 deletions(-) create mode 100644 Documentation/netlink/specs/nfsd_server.yaml create mode 100644 fs/nfsd/nfs_netlink_gen.c create mode 100644 fs/nfsd/nfs_netlink_gen.h create mode 100644 include/uapi/linux/nfsd_server.h -- 2.41.0
