Two new messages are added to support negotiating hb timeout.  Stop
nodes frmo talking an old version to mount as they will cause the
negotiation to fail.
Link: http://lkml.kernel.org/r/1464231615-27939-1-git-send-email-junxiao.bi@oracle.com
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  * version here in tcp_internal.h should not need to be bumped for
  * filesystem locking changes.
  *
+ * New in version 12
+ *     - Negotiate hb timeout when storage is down.
+ *
  * New in version 11
  *     - Negotiation of filesystem locking in the dlm join.
  *
  *     - full 64 bit i_size in the metadata lock lvbs
  *     - introduction of "rw" lock and pushing meta/data locking down
  */
-#define O2NET_PROTOCOL_VERSION 11ULL
+#define O2NET_PROTOCOL_VERSION 12ULL
 struct o2net_handshake {
        __be64  protocol_version;
        __be64  connector_id;