[PATCH v7 0/3] add rpc_status netlink support for NFSD

Lorenzo Bianconi
2023-08-30T18:29:42Z

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 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=3D3D366

Lorenzo Bianconi (3):
SUNRPC: export nfsd4_op_name utility routine
SUNRPC: export svc_proc_name utility routine
NFSD: add rpc_status netlink support

fs/nfsd/nfs4proc.c | 4 +-
fs/nfsd/nfsctl.c | 275 +++++++++++++++++++++++++++++++++++++
fs/nfsd/nfsd.h | 25 ++++
fs/nfsd/nfssvc.c | 15 ++
fs/nfsd/state.h | 2 -
include/linux/sunrpc/svc.h | 1 +
include/uapi/linux/nfs.h | 54 ++++++++
net/sunrpc/svc.c | 2 +-
8 files changed, 372 insertions(+), 6 deletions(-)

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2.41.0