smb3: add tracepoint for sending lease break responses to server

Be able to log a ftrace message on success and/or failure of
sending a lease break response to the server.

Example output:

           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
             | |       |   ||||       |         |
     kworker/1:1-5681  [001] .... 11123.530457: smb3_lease_done: sid=0x291e3e0f tid=0x8ba43071 lease_key=0x1852ca0d3ecd9b55847750a86716fde lease_state=0x0
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>

fs/cifs/smb2pdu.c

@@ -4277,6 +4277,8 @@ SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
 	struct kvec iov[1];
 	struct kvec rsp_iov;
 	int resp_buf_type;
+	__u64 *please_key_high;
+	__u64 *please_key_low;
 
 	cifs_dbg(FYI, "SMB2_lease_break\n");
 	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
@@ -4306,10 +4308,16 @@ SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
 	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
 	cifs_small_buf_release(req);
 
+	please_key_low = (__u64 *)req->LeaseKey;
+	please_key_high = (__u64 *)(req->LeaseKey+8);
 	if (rc) {
 		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
+		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
+			ses->Suid, *please_key_low, *please_key_high, rc);
 		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
-	}
+	} else
+		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
+			ses->Suid, *please_key_low, *please_key_high);
 
 	return rc;
 }

fs/cifs/trace.h

@@ -460,6 +460,85 @@ DEFINE_EVENT(smb3_open_done_class, smb3_##name,  \
 DEFINE_SMB3_OPEN_DONE_EVENT(open_done);
 DEFINE_SMB3_OPEN_DONE_EVENT(posix_mkdir_done);
 
+
+DECLARE_EVENT_CLASS(smb3_lease_done_class,
+	TP_PROTO(__u32	lease_state,
+		__u32	tid,
+		__u64	sesid,
+		__u64	lease_key_low,
+		__u64	lease_key_high),
+	TP_ARGS(lease_state, tid, sesid, lease_key_low, lease_key_high),
+	TP_STRUCT__entry(
+		__field(__u32, lease_state)
+		__field(__u32, tid)
+		__field(__u64, sesid)
+		__field(__u64, lease_key_low)
+		__field(__u64, lease_key_high)
+	),
+	TP_fast_assign(
+		__entry->lease_state = lease_state;
+		__entry->tid = tid;
+		__entry->sesid = sesid;
+		__entry->lease_key_low = lease_key_low;
+		__entry->lease_key_high = lease_key_high;
+	),
+	TP_printk("sid=0x%llx tid=0x%x lease_key=0x%llx%llx lease_state=0x%x",
+		__entry->sesid, __entry->tid, __entry->lease_key_high,
+		__entry->lease_key_low, __entry->lease_state)
+)
+
+#define DEFINE_SMB3_LEASE_DONE_EVENT(name)        \
+DEFINE_EVENT(smb3_lease_done_class, smb3_##name,  \
+	TP_PROTO(__u32	lease_state,		\
+		__u32	tid,			\
+		__u64	sesid,			\
+		__u64	lease_key_low,		\
+		__u64	lease_key_high),	\
+	TP_ARGS(lease_state, tid, sesid, lease_key_low, lease_key_high))
+
+DEFINE_SMB3_LEASE_DONE_EVENT(lease_done);
+
+DECLARE_EVENT_CLASS(smb3_lease_err_class,
+	TP_PROTO(__u32	lease_state,
+		__u32	tid,
+		__u64	sesid,
+		__u64	lease_key_low,
+		__u64	lease_key_high,
+		int	rc),
+	TP_ARGS(lease_state, tid, sesid, lease_key_low, lease_key_high, rc),
+	TP_STRUCT__entry(
+		__field(__u32, lease_state)
+		__field(__u32, tid)
+		__field(__u64, sesid)
+		__field(__u64, lease_key_low)
+		__field(__u64, lease_key_high)
+		__field(int, rc)
+	),
+	TP_fast_assign(
+		__entry->lease_state = lease_state;
+		__entry->tid = tid;
+		__entry->sesid = sesid;
+		__entry->lease_key_low = lease_key_low;
+		__entry->lease_key_high = lease_key_high;
+		__entry->rc = rc;
+	),
+	TP_printk("sid=0x%llx tid=0x%x lease_key=0x%llx%llx lease_state=0x%x rc=%d",
+		__entry->sesid, __entry->tid, __entry->lease_key_high,
+		__entry->lease_key_low, __entry->lease_state, __entry->rc)
+)
+
+#define DEFINE_SMB3_LEASE_ERR_EVENT(name)        \
+DEFINE_EVENT(smb3_lease_err_class, smb3_##name,  \
+	TP_PROTO(__u32	lease_state,		\
+		__u32	tid,			\
+		__u64	sesid,			\
+		__u64	lease_key_low,		\
+		__u64	lease_key_high,		\
+		int	rc),			\
+	TP_ARGS(lease_state, tid, sesid, lease_key_low, lease_key_high, rc))
+
+DEFINE_SMB3_LEASE_ERR_EVENT(lease_err);
+
 DECLARE_EVENT_CLASS(smb3_reconnect_class,
 	TP_PROTO(__u64	currmid,
 		char *hostname),