NFSv4: Add tracepoints for debugging the idmapper

Add tracepoints to help debug uid/gid mappings to username/group.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 900f233ee4dc..f58edcf418bf 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -627,6 +627,52 @@ DEFINE_NFS4_INODE_EVENT(nfs4_set_security_label);
 DEFINE_NFS4_INODE_EVENT(nfs4_recall_delegation);
 DEFINE_NFS4_INODE_EVENT(nfs4_delegreturn);
 
+DECLARE_EVENT_CLASS(nfs4_idmap_event,
+                TP_PROTO(
+                        const char *name,
+                        int len,
+                        u32 id,
+                        int error
+                ),
+
+                TP_ARGS(name, len, id, error),
+
+                TP_STRUCT__entry(
+                        __field(int, error)
+                        __field(u32, id)
+                        __dynamic_array(char, name, len > 0 ? len + 1 : 1)
+                ),
+
+                TP_fast_assign(
+                        if (len < 0)
+                                len = 0;
+                        __entry->error = error < 0 ? error : 0;
+                        __entry->id = id;
+                        memcpy(__get_dynamic_array(name), name, len);
+                        ((char *)__get_dynamic_array(name))[len] = 0;
+                ),
+
+                TP_printk(
+                        "error=%d id=%u name=%s",
+                        __entry->error,
+                        __entry->id,
+                        __get_str(name)
+                )
+);
+#define DEFINE_NFS4_IDMAP_EVENT(name) \
+        DEFINE_EVENT(nfs4_idmap_event, name, \
+                        TP_PROTO( \
+                                const char *name, \
+                                int len, \
+                                u32 id, \
+                                int error \
+                        ), \
+                        TP_ARGS(name, len, id, error))
+DEFINE_NFS4_IDMAP_EVENT(nfs4_map_name_to_uid);
+DEFINE_NFS4_IDMAP_EVENT(nfs4_map_group_to_gid);
+DEFINE_NFS4_IDMAP_EVENT(nfs4_map_uid_to_name);
+DEFINE_NFS4_IDMAP_EVENT(nfs4_map_gid_to_group);
+
 #endif /* _TRACE_NFS4_H */
 
 #undef TRACE_INCLUDE_PATH