Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Lorenzo Bianconi <lorenzo@kernel.org>
To:     linux-nfs@vger.kernel.org
Cc:     lorenzo.bianconi@redhat.com, chuck.lever@oracle.com,
        jlayton@kernel.org, neilb@suse.de, netdev@vger.kernel.org
Subject: [PATCH v8 0/3] add rpc_status netlink support for NFSD
Date:   Mon, 11 Sep 2023 14:49:43 +0200
Message-ID: <cover.1694436263.git.lorenzo@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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