This RFC series adds logic to the Linux NFS server to make it wait a
few moments for clients to return a delegation before replying with
NFS4ERR_DELAY. There are two main benefits:
- This improves responsiveness when a delegated file is accessed
from another client
- This removes an unnecessary latency if a client has neglected to
return a delegation before attempting a RENAME or SETATTR
This series is incomplete:
- There are likely other operations that can benefit (eg. OPEN)
This series applies against v5.19.
Changes since v2:
- Wake immediately after client sends DELEGRETURN
- More tracepoint improvements
Changes since RFC:
- Eliminate spurious console messages on the server
- Wait for DELEGRETURN for RENAME operations
- Add CB done tracepoints
- Rework the retry loop
---
Chuck Lever (7):
NFSD: Instrument fh_verify()
NFSD: Replace dprintk() call site in fh_verify()
NFSD: Trace NFSv4 COMPOUND tags
NFSD: Add tracepoints to report NFSv4 callback completions
NFSD: Add a mechanism to wait for a DELEGRETURN
NFSD: Make nfsd4_setattr() wait before returning NFS4ERR_DELAY
NFSD: Make nfsd4_rename() wait before returning NFS4ERR_DELAY
fs/nfsd/nfs4layouts.c | 2 +-
fs/nfsd/nfs4proc.c | 56 +++++++++++---
fs/nfsd/nfs4state.c | 35 +++++++++
fs/nfsd/nfsd.h | 1 +
fs/nfsd/nfsfh.c | 13 +---
fs/nfsd/trace.h | 171 ++++++++++++++++++++++++++++++++++++++++--
fs/nfsd/xdr4.h | 2 +
7 files changed, 251 insertions(+), 29 deletions(-)
--
Chuck Lever
