Function vdev_alloc_common

freebsd/contrib/openzfs/module/zfs/vdev.c:539–634

* Allocate and minimally initialize a vdev_t. */

 * Allocate and minimally initialize a vdev_t.
 */
vdev_t *
vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops)
{
	vdev_t *vd;
	vdev_indirect_config_t *vic;

	vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP);
	vic = &vd->vdev_indirect_config;

	if (spa->spa_root_vdev == NULL) {
		ASSERT(ops == &vdev_root_ops);
		spa->spa_root_vdev = vd;
		spa->spa_load_guid = spa_generate_guid(NULL);
	}

	if (guid == 0 && ops != &vdev_hole_ops) {
		if (spa->spa_root_vdev == vd) {
			/*
			 * The root vdev's guid will also be the pool guid,
			 * which must be unique among all pools.
			 */
			guid = spa_generate_guid(NULL);
		} else {
			/*
			 * Any other vdev's guid must be unique within the pool.
			 */
			guid = spa_generate_guid(spa);
		}
		ASSERT(!spa_guid_exists(spa_guid(spa), guid));
	}

	vd->vdev_spa = spa;
	vd->vdev_id = id;
	vd->vdev_guid = guid;
	vd->vdev_guid_sum = guid;
	vd->vdev_ops = ops;
	vd->vdev_state = VDEV_STATE_CLOSED;
	vd->vdev_ishole = (ops == &vdev_hole_ops);
	vic->vic_prev_indirect_vdev = UINT64_MAX;

	rw_init(&vd->vdev_indirect_rwlock, NULL, RW_DEFAULT, NULL);
	mutex_init(&vd->vdev_obsolete_lock, NULL, MUTEX_DEFAULT, NULL);
	vd->vdev_obsolete_segments = range_tree_create(NULL, RANGE_SEG64, NULL,
	    0, 0);

	/*
	 * Initialize rate limit structs for events.  We rate limit ZIO delay
	 * and checksum events so that we don't overwhelm ZED with thousands
	 * of events when a disk is acting up.
	 */
	zfs_ratelimit_init(&vd->vdev_delay_rl, &zfs_slow_io_events_per_second,
	    1);
	zfs_ratelimit_init(&vd->vdev_checksum_rl,
	    &zfs_checksum_events_per_second, 1);

	list_link_init(&vd->vdev_config_dirty_node);
	list_link_init(&vd->vdev_state_dirty_node);
	list_link_init(&vd->vdev_initialize_node);