request_demote
request_demote(gl, LM_ST_UNLOCKED, 0, false);
request_demote(gl, state, delay, true);
request_demote(gl, LM_ST_UNLOCKED, 0, false);
request_demote(gl, LM_ST_UNLOCKED, 0, false);
request_demote(gl, LM_ST_UNLOCKED, 0, false);
static void request_demote(struct gfs2_glock *gl, unsigned int state,