Function swapgeom_release

freebsd/vm/swap_pager.c:2775–2785

* Remove a reference from the g_consumer. Post a close event if all * references go away, since the function might be called from the * biodone context. */

 * biodone context.
 */
static void
swapgeom_release(struct g_consumer *cp, struct swdevt *sp)
{

	mtx_assert(&sw_dev_mtx, MA_OWNED);
	cp->index--;
	if (cp->index == 0) {
		if (g_post_event(swapgeom_close_ev, cp, M_NOWAIT, NULL) == 0)
			sp->sw_id = NULL;
	}
}

static void
swapgeom_done(struct bio *bp2)