Display number of credits available

In debugging smb3, it is useful to display the number
of credits available, so we can see when the server has not granted
sufficient operations for the client to make progress, or alternatively
the client has requested too many credits (as we saw in a recent bug)
so we can compare with the number of credits the server thinks
we have.

Add a /proc/fs/cifs/DebugData line to display the client view
on how many credits are available.

Signed-off-by: Steve French <steve.french@primarydata.com>
Reported-by: Germano Percossi <germano.percossi@citrix.com>
CC: Stable <stable@vger.kernel.org>

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 6c58e13fed2f1d647e9b4cc58e1fc3660aff95d3..3d03e48a92139a4f67feeb072048ee5649006481 100644 (file)
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -152,6 +152,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
        list_for_each(tmp1, &cifs_tcp_ses_list) {
                server = list_entry(tmp1, struct TCP_Server_Info,
                                    tcp_ses_list);
+               seq_printf(m, "\nNumber of credits: %d", server->credits);
                i++;
                list_for_each(tmp2, &server->smb_ses_list) {
                        ses = list_entry(tmp2, struct cifs_ses,