CEPH_MDS_SESSION_CLOSED
session->s_state = CEPH_MDS_SESSION_CLOSED;
if (session->s_state == CEPH_MDS_SESSION_CLOSED ||
sessions[i]->s_state = CEPH_MDS_SESSION_CLOSED;
case CEPH_MDS_SESSION_CLOSED:
s->s_state = CEPH_MDS_SESSION_CLOSED;
case CEPH_MDS_SESSION_CLOSED:
case CEPH_MDS_SESSION_CLOSED: return "closed";