Function vdev_sync

freebsd/contrib/openzfs/module/zfs/vdev.c:3538–3594

}

void
vdev_sync(vdev_t *vd, uint64_t txg)
{
	spa_t *spa = vd->vdev_spa;
	vdev_t *lvd;
	metaslab_t *msp;

	ASSERT3U(txg, ==, spa->spa_syncing_txg);
	dmu_tx_t *tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
	if (range_tree_space(vd->vdev_obsolete_segments) > 0) {
		ASSERT(vd->vdev_removing ||
		    vd->vdev_ops == &vdev_indirect_ops);

		vdev_indirect_sync_obsolete(vd, tx);

		/*
		 * If the vdev is indirect, it can't have dirty
		 * metaslabs or DTLs.
		 */
		if (vd->vdev_ops == &vdev_indirect_ops) {
			ASSERT(txg_list_empty(&vd->vdev_ms_list, txg));
			ASSERT(txg_list_empty(&vd->vdev_dtl_list, txg));
			dmu_tx_commit(tx);
			return;
		}
	}

	ASSERT(vdev_is_concrete(vd));

	if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0 &&
	    !vd->vdev_removing) {
		ASSERT(vd == vd->vdev_top);
		ASSERT0(vd->vdev_indirect_config.vic_mapping_object);
		vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset,
		    DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx);
		ASSERT(vd->vdev_ms_array != 0);
		vdev_config_dirty(vd);
	}

	while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) {
		metaslab_sync(msp, txg);
		(void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
	}

	while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL)
		vdev_dtl_sync(lvd, txg);

	/*
	 * If this is an empty log device being removed, destroy the
	 * metadata associated with it.
	 */
	if (vd->vdev_islog && vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing)
		vdev_remove_empty_log(vd, txg);

	(void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
	dmu_tx_commit(tx);
}