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From:   Dai Ngo <dai.ngo@oracle.com>
To:     chuck.lever@oracle.com, jlayton@kernel.org
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH v5 0/4] add support for CB_RECALL_ANY and the delegation reaper
Date:   Wed, 16 Nov 2022 19:44:44 -0800
Message-Id: <1668656688-22507-1-git-send-email-dai.ngo@oracle.com>
Precedence: bulk

This patch series adds:

    . refactor courtesy_client_reaper to a generic low memory
      shrinker.

    . XDR encode and decode function for CB_RECALL_ANY op.

    . the delegation reaper that sends the advisory CB_RECALL_ANY 
      to the clients to release unused delegations.
      There is only one nfsd4_callback added for each nfs4_cleint.
      Access to it must be serialized via the client flag
      NFSD4_CLIENT_CB_RECALL_ANY.

    . Add CB_RECALL_ANY tracepoints.

v2:
    . modify deleg_reaper to check and send CB_RECALL_ANY to client
      only once per 5 secs.
v3:
    . modify nfsd4_cb_recall_any_release to use nn->client_lock to
      protect cl_recall_any_busy and call put_client_renew_locked
      to decrement cl_rpc_users.

v4:
    . move changes in nfs4state.c from patch (1/2) to patch(2/2).
    . use xdr_stream_encode_u32 and xdr_stream_encode_uint32_array
      to encode CB_RECALL_ANY arguments.
    . add struct nfsd4_cb_recall_any with embedded nfs4_callback
      and params for CB_RECALL_ANY op.
    . replace cl_recall_any_busy boolean with client flag
      NFSD4_CLIENT_CB_RECALL_ANY 
    . add tracepoints for CB_RECALL_ANY

v5:
    . refactor courtesy_client_reaper to a generic low memory
      shrinker
    . merge courtesy client shrinker and delegtion shrinker into
      one.
    . reposition nfsd_cb_recall_any and nfsd_cb_recall_any_done
      in nfsd/trace.h
    . use __get_sockaddr to display server IP address in
      tracepoints.
    . modify encode_cb_recallany4args to replace sizeof with
      ARRAY_SIZE.

---

Dai Ngo (4):
     NFSD: refactoring courtesy_client_reaper to a generic low memory shrinker
     NFSD: add support for sending CB_RECALL_ANY
     NFSD: add delegation shrinker to react to low memory condition
     NFSD: add CB_RECALL_ANY tracepoints

 fs/nfsd/nfs4callback.c |  62 +++++++++++++++++++++++
 fs/nfsd/nfs4state.c    | 116 +++++++++++++++++++++++++++++++++++++++-----
 fs/nfsd/state.h        |   9 ++++
 fs/nfsd/trace.h        |  49 +++++++++++++++++++
 fs/nfsd/xdr4.h         |   5 ++
 fs/nfsd/xdr4cb.h       |   6 +++
 6 files changed, 234 insertions(+), 13 deletions(-)