[PATCH v2 0/5] Implement referring call lists for CB_OFFLOAD

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

I've built a naive proof-of-concept of the csa_referring_call_list
argument of the CB_SEQUENCE operation, and hooked it up for the
CB_OFFLOAD callback operation.

This has been pushed to my kernel.org "fix-async-copy" branch for
folks to play around with.

I've done some basic testing with a server that ensures the
CB_OFFLOAD callback is sent before the COPY reply, while running a
network capture. Operation appears correct, Wireshark is happy
with the construction of the XDR, and the CB_SEQUENCE arguments
match the SEQUENCE operation in the COPY COMPOUND.

I'd like to include this series in nfsd-testing.

Changes since RFC:
- Add a field to struct nfsd4_slot that records its table index
- Include a few additional COPY-related fixes
- Some operational testing has been done

Chuck Lever (5):
  NFSD: OFFLOAD_CANCEL should mark an async COPY as completed
  NFSD: Shorten CB_OFFLOAD response to NFS4ERR_DELAY
  NFSD: Implement CB_SEQUENCE referring call lists
  NFSD: Record each NFSv4 call's session slot index
  NFSD: Use a referring call list for CB_OFFLOAD

 fs/nfsd/nfs4callback.c | 132 +++++++++++++++++++++++++++++++++++++++--
 fs/nfsd/nfs4proc.c     |  16 ++++-
 fs/nfsd/nfs4state.c    |  38 ++++++------
 fs/nfsd/state.h        |  23 +++++++
 fs/nfsd/xdr4.h         |   4 ++
 fs/nfsd/xdr4cb.h       |   5 +-
 6 files changed, 193 insertions(+), 25 deletions(-)

-- 
2.47.0