[RFC PATCH 9/9] NFS: Refactor trace_nfs4_offload_cancel

[cel@kernel.org]

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

Add a trace_nfs4_offload_status trace point that looks just like
trace_nfs4_offload_cancel. Promote that event to an event class to
avoid duplicating code.

An alternative approach would be to expand trace_nfs4_offload_status
to report more of the actual OFFLOAD_STATUS result.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfs/nfs42proc.c |  2 ++
 fs/nfs/nfs4trace.h | 11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index fc4f64750dc5..969293bf8228 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -630,6 +630,8 @@ static void nfs42_offload_status_done(struct rpc_task *task, void *calldata)
 {
 	struct nfs42_offload_data *data = calldata;
 
+	trace_nfs4_offload_status(&data->args, task->tk_status);
+
 	if (!nfs4_sequence_done(task, &data->res.osr_seq_res))
 		return;
 
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 22c973316f0b..bc67fe6801b1 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -2608,7 +2608,7 @@ TRACE_EVENT(nfs4_copy_notify,
 		)
 );
 
-TRACE_EVENT(nfs4_offload_cancel,
+DECLARE_EVENT_CLASS(nfs4_offload_class,
 		TP_PROTO(
 			const struct nfs42_offload_status_args *args,
 			int error
@@ -2640,6 +2640,15 @@ TRACE_EVENT(nfs4_offload_cancel,
 			__entry->stateid_seq, __entry->stateid_hash
 		)
 );
+#define DEFINE_NFS4_OFFLOAD_EVENT(name) \
+	DEFINE_EVENT(nfs4_offload_class, name,  \
+			TP_PROTO( \
+				const struct nfs42_offload_status_args *args, \
+				int error \
+			), \
+			TP_ARGS(args, error))
+DEFINE_NFS4_OFFLOAD_EVENT(nfs4_offload_cancel);
+DEFINE_NFS4_OFFLOAD_EVENT(nfs4_offload_status);
 
 DECLARE_EVENT_CLASS(nfs4_xattr_event,
 		TP_PROTO(
-- 
2.46.2