Function vdev_remove_complete

freebsd/contrib/openzfs/module/zfs/vdev_removal.c:1179–1246

* Complete the removal of a toplevel vdev. This is called in open * context by the removal thread after we have copied all vdev's data. */

 * context by the removal thread after we have copied all vdev's data.
 */
static void
vdev_remove_complete(spa_t *spa)
{
	uint64_t txg;

	/*
	 * Wait for any deferred frees to be synced before we call
	 * vdev_metaslab_fini()
	 */
	txg_wait_synced(spa->spa_dsl_pool, 0);
	txg = spa_vdev_enter(spa);
	vdev_t *vd = vdev_lookup_top(spa, spa->spa_vdev_removal->svr_vdev_id);
	ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
	ASSERT3P(vd->vdev_trim_thread, ==, NULL);
	ASSERT3P(vd->vdev_autotrim_thread, ==, NULL);

	sysevent_t *ev = spa_event_create(spa, vd, NULL,
	    ESC_ZFS_VDEV_REMOVE_DEV);

	zfs_dbgmsg("finishing device removal for vdev %llu in txg %llu",
	    vd->vdev_id, txg);

	/*
	 * Discard allocation state.
	 */
	if (vd->vdev_mg != NULL) {
		vdev_metaslab_fini(vd);
		metaslab_group_destroy(vd->vdev_mg);
		vd->vdev_mg = NULL;
		spa_log_sm_set_blocklimit(spa);
	}
	ASSERT0(vd->vdev_stat.vs_space);
	ASSERT0(vd->vdev_stat.vs_dspace);

	vdev_remove_replace_with_indirect(vd, txg);

	/*
	 * We now release the locks, allowing spa_sync to run and finish the
	 * removal via vdev_remove_complete_sync in syncing context.
	 *
	 * Note that we hold on to the vdev_t that has been replaced.  Since
	 * it isn't part of the vdev tree any longer, it can't be concurrently
	 * manipulated, even while we don't have the config lock.
	 */
	(void) spa_vdev_exit(spa, NULL, txg, 0);

	/*
	 * Top ZAP should have been transferred to the indirect vdev in
	 * vdev_remove_replace_with_indirect.
	 */
	ASSERT0(vd->vdev_top_zap);

	/*
	 * Leaf ZAP should have been moved in vdev_remove_replace_with_indirect.
	 */
	ASSERT0(vd->vdev_leaf_zap);

	txg = spa_vdev_enter(spa);