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Subject: [PATCH v2 23/25] NFSD: Add an nfsd_cb_probe tracepoint
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org
Cc:     dwysocha@redhat.com, bfields@fieldses.org, rostedt@goodmis.org
Date:   Wed, 12 May 2021 11:37:26 -0400
Message-ID: <162083384624.3108.734544982694189070.stgit@klimt.1015granger.net>
In-Reply-To: <162083366966.3108.12581818416105328952.stgit@klimt.1015granger.net>
References: <162083366966.3108.12581818416105328952.stgit@klimt.1015granger.net>
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Record a tracepoint event when the server performs a callback
probe. This event can be enabled as a group with other nfsd_cb
tracepoints.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4callback.c |    1 +
 fs/nfsd/trace.h        |    1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index c2a2a58b3581..ddab969d7865 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -998,6 +998,7 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {
  */
 void nfsd4_probe_callback(struct nfs4_client *clp)
 {
+	trace_nfsd_cb_probe(clp);
 	nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN);
 	set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
 	nfsd4_run_cb(&clp->cl_cb_null);
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 7f6a2cae0019..da8e7a5a9c61 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -907,6 +907,7 @@ DEFINE_EVENT(nfsd_cb_class, nfsd_cb_##name,		\
 	TP_ARGS(clp))
 
 DEFINE_NFSD_CB_EVENT(state);
+DEFINE_NFSD_CB_EVENT(probe);
 DEFINE_NFSD_CB_EVENT(lost);
 DEFINE_NFSD_CB_EVENT(shutdown);