CEPH_MDS_SESSION_OPENING
session->s_state = CEPH_MDS_SESSION_OPENING;
WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING &&
case CEPH_MDS_SESSION_OPENING:
case CEPH_MDS_SESSION_OPENING:
case CEPH_MDS_SESSION_OPENING: return "opening";