nfsd: new tracepoint for after op_func in compound processing

Turn nfsd_compound_encode_err tracepoint into a class and add a new
nfsd_compound_op_err tracepoint.

Signed-off-by: Jeff Layton <[e-mail]>
Signed-off-by: Chuck Lever <[e-mail]>

fs/nfsd/nfs4proc.c

···
 		if (op->opdesc->op_get_currentstateid)
 			op->opdesc->op_get_currentstateid(cstate, &op->u);
 		op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
+		trace_nfsd_compound_op_err(rqstp, op->opnum, op->status);
 
 		/* Only from SEQUENCE */
 		if (cstate->status == nfserr_replay_cache) {

fs/nfsd/trace.h

···
 		__entry->opnum, __entry->status)
 );
 
-TRACE_EVENT(nfsd_compound_encode_err,
+DECLARE_EVENT_CLASS(nfsd_compound_err_class,
 	TP_PROTO(
 		const struct svc_rqst *rqstp,
 		u32 opnum,
···
 	TP_printk("opnum=%u status=%lu",
 		__entry->opnum, __entry->status)
 );
+
+#define DEFINE_NFSD_COMPOUND_ERR_EVENT(name)				\
+DEFINE_EVENT(nfsd_compound_err_class, nfsd_compound_##name##_err,	\
+	TP_PROTO(							\
+		const struct svc_rqst *rqstp,				\
+		u32 opnum,						\
+		__be32 status						\
+	),								\
+	TP_ARGS(rqstp, opnum, status))
+
+DEFINE_NFSD_COMPOUND_ERR_EVENT(op);
+DEFINE_NFSD_COMPOUND_ERR_EVENT(encode);
 
 #define show_fs_file_type(x) \
 	__print_symbolic(x, \