smb3: add dynamic tracepoint for timeout waiting for credits
To help debug credit starvation problems where we timeout
waiting for server to grant the client credits.
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index b3d0401..8731cfa 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -527,6 +527,8 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
has_credits(server, credits, num_credits), t);
cifs_num_waiters_dec(server);
if (!rc) {
+ trace_smb3_credit_timeout(server->CurrentMid,
+ server->hostname, num_credits);
cifs_dbg(VFS, "wait timed out after %d ms\n",
timeout);
return -ENOTSUPP;
@@ -565,6 +567,9 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
t);
cifs_num_waiters_dec(server);
if (!rc) {
+ trace_smb3_credit_timeout(
+ server->CurrentMid,
+ server->hostname, num_credits);
cifs_dbg(VFS, "wait timed out after %d ms\n",
timeout);
return -ENOTSUPP;