[RFC PATCH 7/7] NFSD: Wrap async copy operations with trace points

[cel@xxxxxxxxxx]

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

Add an nfsd_copy_async_done to record the timestamp, the final
status code, and the callback stateid of an async copy.

Rename the nfsd_copy_do_async tracepoint to match that naming
convention to make it easier to enable both of these with a
single glob.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 fs/nfsd/nfs4proc.c |  3 +-
 fs/nfsd/trace.h    | 71 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 72 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 27f7eceb3b00..8b2074c72206 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1758,7 +1758,7 @@ static int nfsd4_do_async_copy(void *data)
 {
 	struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
 
-	trace_nfsd_copy_do_async(copy);
+	trace_nfsd_copy_async(copy);
 	if (nfsd4_ssc_is_inter(copy)) {
 		struct file *filp;
 
@@ -1785,6 +1785,7 @@ static int nfsd4_do_async_copy(void *data)
 
 do_callback:
 	set_bit(NFSD4_COPY_F_COMPLETED, &copy->cp_flags);
+	trace_nfsd_copy_async_done(copy);
 	nfsd4_send_cb_offload(copy);
 	cleanup_async_copy(copy);
 	return 0;
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index d3bbd58b44de..5febacd479b4 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2184,7 +2184,7 @@ DEFINE_EVENT(nfsd_copy_class, nfsd_copy_##name,	\
 
 DEFINE_COPY_EVENT(inter);
 DEFINE_COPY_EVENT(intra);
-DEFINE_COPY_EVENT(do_async);
+DEFINE_COPY_EVENT(async);
 
 TRACE_EVENT(nfsd_copy_done,
 	TP_PROTO(
@@ -2210,6 +2210,75 @@ TRACE_EVENT(nfsd_copy_done,
 	)
 );
 
+TRACE_EVENT(nfsd_copy_async_done,
+	TP_PROTO(
+		const struct nfsd4_copy *copy
+	),
+	TP_ARGS(copy),
+	TP_STRUCT__entry(
+		__field(int, status)
+		__field(bool, intra)
+		__field(bool, async)
+		__field(u32, src_cl_boot)
+		__field(u32, src_cl_id)
+		__field(u32, src_so_id)
+		__field(u32, src_si_generation)
+		__field(u32, dst_cl_boot)
+		__field(u32, dst_cl_id)
+		__field(u32, dst_so_id)
+		__field(u32, dst_si_generation)
+		__field(u32, cb_cl_boot)
+		__field(u32, cb_cl_id)
+		__field(u32, cb_so_id)
+		__field(u32, cb_si_generation)
+		__field(u64, src_cp_pos)
+		__field(u64, dst_cp_pos)
+		__field(u64, cp_count)
+		__sockaddr(addr, sizeof(struct sockaddr_in6))
+	),
+	TP_fast_assign(
+		const stateid_t *src_stp = &copy->cp_src_stateid;
+		const stateid_t *dst_stp = &copy->cp_dst_stateid;
+		const stateid_t *cb_stp = &copy->cp_res.cb_stateid;
+
+		__entry->status = be32_to_cpu(copy->nfserr);
+		__entry->intra = test_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
+		__entry->async = !test_bit(NFSD4_COPY_F_SYNCHRONOUS, &copy->cp_flags);
+		__entry->src_cl_boot = src_stp->si_opaque.so_clid.cl_boot;
+		__entry->src_cl_id = src_stp->si_opaque.so_clid.cl_id;
+		__entry->src_so_id = src_stp->si_opaque.so_id;
+		__entry->src_si_generation = src_stp->si_generation;
+		__entry->dst_cl_boot = dst_stp->si_opaque.so_clid.cl_boot;
+		__entry->dst_cl_id = dst_stp->si_opaque.so_clid.cl_id;
+		__entry->dst_so_id = dst_stp->si_opaque.so_id;
+		__entry->dst_si_generation = dst_stp->si_generation;
+		__entry->cb_cl_boot = cb_stp->si_opaque.so_clid.cl_boot;
+		__entry->cb_cl_id = cb_stp->si_opaque.so_clid.cl_id;
+		__entry->cb_so_id = cb_stp->si_opaque.so_id;
+		__entry->cb_si_generation = cb_stp->si_generation;
+		__entry->src_cp_pos = copy->cp_src_pos;
+		__entry->dst_cp_pos = copy->cp_dst_pos;
+		__entry->cp_count = copy->cp_count;
+		__assign_sockaddr(addr, &copy->cp_clp->cl_addr,
+				sizeof(struct sockaddr_in6));
+	),
+	TP_printk("client=%pISpc status=%d intra=%d async=%d "
+		"src_client %08x:%08x src_stateid %08x:%08x "
+		"dst_client %08x:%08x dst_stateid %08x:%08x "
+		"cb_client %08x:%08x cb_stateid %08x:%08x "
+		"cp_src_pos=%llu cp_dst_pos=%llu cp_count=%llu",
+		__get_sockaddr(addr),
+		__entry->status, __entry->intra, __entry->async,
+		__entry->src_cl_boot, __entry->src_cl_id,
+		__entry->src_so_id, __entry->src_si_generation,
+		__entry->dst_cl_boot, __entry->dst_cl_id,
+		__entry->dst_so_id, __entry->dst_si_generation,
+		__entry->cb_cl_boot, __entry->cb_cl_id,
+		__entry->cb_so_id, __entry->cb_si_generation,
+		__entry->src_cp_pos, __entry->dst_cp_pos, __entry->cp_count
+	)
+);
+
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
2.46.0