[PATCH RFC 20/24] nfs: new tracepoint in match_stateid operation

[Jeff Layton <jlayton@kernel.org>]

Add new tracepoints in the NFSv4 match_stateid minorversion op that show
the info in both stateids.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfs/nfs4proc.c  |  4 ++++
 fs/nfs/nfs4trace.h | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 815996cb27fc..d518388bd0d6 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -10432,6 +10432,8 @@ nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
 static bool nfs41_match_stateid(const nfs4_stateid *s1,
 		const nfs4_stateid *s2)
 {
+	trace_nfs41_match_stateid(s1, s2);
+
 	if (s1->type != s2->type)
 		return false;
 
@@ -10449,6 +10451,8 @@ static bool nfs41_match_stateid(const nfs4_stateid *s1,
 static bool nfs4_match_stateid(const nfs4_stateid *s1,
 		const nfs4_stateid *s2)
 {
+	trace_nfs4_match_stateid(s1, s2);
+
 	return nfs4_stateid_match(s1, s2);
 }
 
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index e5adfb755dc7..f531728a5b4a 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -1467,6 +1467,62 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_callback_event,
 DEFINE_NFS4_INODE_STATEID_CALLBACK_EVENT(nfs4_cb_recall);
 DEFINE_NFS4_INODE_STATEID_CALLBACK_EVENT(nfs4_cb_layoutrecall_file);
 
+#define show_stateid_type(type) \
+	__print_symbolic(type, \
+		{ NFS4_INVALID_STATEID_TYPE, "INVALID" }, \
+		{ NFS4_SPECIAL_STATEID_TYPE, "SPECIAL" }, \
+		{ NFS4_OPEN_STATEID_TYPE, "OPEN" }, \
+		{ NFS4_LOCK_STATEID_TYPE, "LOCK" }, \
+		{ NFS4_DELEGATION_STATEID_TYPE, "DELEGATION" }, \
+		{ NFS4_LAYOUT_STATEID_TYPE, "LAYOUT" },	\
+		{ NFS4_PNFS_DS_STATEID_TYPE, "PNFS_DS" }, \
+		{ NFS4_REVOKED_STATEID_TYPE, "REVOKED" })
+
+DECLARE_EVENT_CLASS(nfs4_match_stateid_event,
+		TP_PROTO(
+			const nfs4_stateid *s1,
+			const nfs4_stateid *s2
+		),
+
+		TP_ARGS(s1, s2),
+
+		TP_STRUCT__entry(
+			__field(int, s1_seq)
+			__field(int, s2_seq)
+			__field(u32, s1_hash)
+			__field(u32, s2_hash)
+			__field(int, s1_type)
+			__field(int, s2_type)
+		),
+
+		TP_fast_assign(
+			__entry->s1_seq = s1->seqid;
+			__entry->s1_hash = nfs_stateid_hash(s1);
+			__entry->s1_type = s1->type;
+			__entry->s2_seq = s2->seqid;
+			__entry->s2_hash = nfs_stateid_hash(s2);
+			__entry->s2_type = s2->type;
+		),
+
+		TP_printk(
+			"s1=%s:%x:%u s2=%s:%x:%u",
+			show_stateid_type(__entry->s1_type),
+			__entry->s1_hash, __entry->s1_seq,
+			show_stateid_type(__entry->s2_type),
+			__entry->s2_hash, __entry->s2_seq
+		)
+);
+
+#define DEFINE_NFS4_MATCH_STATEID_EVENT(name) \
+	DEFINE_EVENT(nfs4_match_stateid_event, name, \
+			TP_PROTO( \
+				const nfs4_stateid *s1, \
+				const nfs4_stateid *s2 \
+			), \
+			TP_ARGS(s1, s2))
+DEFINE_NFS4_MATCH_STATEID_EVENT(nfs41_match_stateid);
+DEFINE_NFS4_MATCH_STATEID_EVENT(nfs4_match_stateid);
+
 DECLARE_EVENT_CLASS(nfs4_idmap_event,
 		TP_PROTO(
 			const char *name,

-- 
2.44.0