Function vdev_reopen

freebsd/contrib/openzfs/module/zfs/vdev.c:2417–2459

* Reopen all interior vdevs and any unopened leaves. We don't actually * reopen leaf vdevs which had previously been opened as they might deadlock * on the spa_config_lock. Instead we only obtain the leaf's physical size. * If the leaf has never been opened then open it, as usual. */

 * If the leaf has never been opened then open it, as usual.
 */
void
vdev_reopen(vdev_t *vd)
{
	spa_t *spa = vd->vdev_spa;

	ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);

	/* set the reopening flag unless we're taking the vdev offline */
	vd->vdev_reopening = !vd->vdev_offline;
	vdev_close(vd);
	(void) vdev_open(vd);

	/*
	 * Call vdev_validate() here to make sure we have the same device.
	 * Otherwise, a device with an invalid label could be successfully
	 * opened in response to vdev_reopen().
	 */
	if (vd->vdev_aux) {
		(void) vdev_validate_aux(vd);
		if (vdev_readable(vd) && vdev_writeable(vd) &&
		    vd->vdev_aux == &spa->spa_l2cache) {
			/*
			 * In case the vdev is present we should evict all ARC
			 * buffers and pointers to log blocks and reclaim their
			 * space before restoring its contents to L2ARC.
			 */
			if (l2arc_vdev_present(vd)) {
				l2arc_rebuild_vdev(vd, B_TRUE);
			} else {
				l2arc_add_vdev(spa, vd);
			}
			spa_async_request(spa, SPA_ASYNC_L2CACHE_REBUILD);
			spa_async_request(spa, SPA_ASYNC_L2CACHE_TRIM);
		}
	} else {
		(void) vdev_validate(vd);
	}

	/*
	 * Reassess parent vdev's health.
	 */
	vdev_propagate_state(vd);
}

int
vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing)