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>

diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 65c7d91..e9b0c59 100644 (file)
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -49,6 +49,7 @@
 
 #include "internal.h"
 #include "netns.h"
+#include "nfs4trace.h"
 
 #define NFS_UINT_MAXLEN 11
 
@@ -849,6 +850,7 @@ int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_
                if (!uid_valid(*uid))
                        ret = -ERANGE;
        }
+       trace_nfs4_map_name_to_uid(name, namelen, id, ret);
        return ret;
 }
 
@@ -865,6 +867,7 @@ int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size
                if (!gid_valid(*gid))
                        ret = -ERANGE;
        }
+       trace_nfs4_map_group_to_gid(name, namelen, id, ret);
        return ret;
 }
 
@@ -879,6 +882,7 @@ int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf,
                ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
        if (ret < 0)
                ret = nfs_map_numeric_to_string(id, buf, buflen);
+       trace_nfs4_map_uid_to_name(buf, ret, id, ret);
        return ret;
 }
 int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
@@ -892,5 +896,6 @@ int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf,
                ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
        if (ret < 0)
                ret = nfs_map_numeric_to_string(id, buf, buflen);
+       trace_nfs4_map_gid_to_group(buf, ret, id, ret);
        return ret;
 }

diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 900f233..f58edcf 100644 (file)
--- 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