ocfs2/net: Add debug interface to o2net

This patch exposes o2net information via debugfs. The information includes
the list of sockets (sock_containers) as well as the list of outstanding
messages (send_tracking). Useful for o2dlm debugging.

(This patch is derived from an earlier one written by Zach Brown that
exposed the same information via /proc.)

[Mark: checkpatch fixes]

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h
index b4c5586f46ea..8d58cfe410b1 100644
--- a/fs/ocfs2/cluster/tcp_internal.h
+++ b/fs/ocfs2/cluster/tcp_internal.h
@@ -166,7 +166,9 @@ struct o2net_sock_container {
         /* original handlers for the sockets */
         void                    (*sc_state_change)(struct sock *sk);
         void                    (*sc_data_ready)(struct sock *sk, int bytes);
-
+#ifdef CONFIG_DEBUG_FS
+        struct list_head        sc_net_debug_item;
+#endif
         struct timeval          sc_tv_timer;
         struct timeval          sc_tv_data_ready;
         struct timeval          sc_tv_advance_start;
@@ -208,4 +210,24 @@ struct o2net_status_wait {
         struct list_head        ns_node_item;
 };
 
+#ifdef CONFIG_DEBUG_FS
+/* just for state dumps */
+struct o2net_send_tracking {
+        struct list_head                st_net_debug_item;
+        struct task_struct              *st_task;
+        struct o2net_sock_container     *st_sc;
+        u32                             st_id;
+        u32                             st_msg_type;
+        u32                             st_msg_key;
+        u8                              st_node;
+        struct timeval                  st_sock_time;
+        struct timeval                  st_send_time;
+        struct timeval                  st_status_time;
+};
+#else
+struct o2net_send_tracking {
+        u32     dummy;
+};
+#endif  /* CONFIG_DEBUG_FS */
+
 #endif /* O2CLUSTER_TCP_INTERNAL_H */