Function spa_vdev_remove

freebsd/contrib/openzfs/module/zfs/vdev_removal.c:2187–2322

* Remove a device from the pool. * * Removing a device from the vdev namespace requires several steps * and can take a significant amount of time. As a result we use * the spa_vdev_config_[enter/exit] functions which allow us to * grab and release the spa_config_lock while still holding the namespace * lock. During each step the configuration is synced out. */

 * lock.  During each step the configuration is synced out.
 */
int
spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
{
	vdev_t *vd;
	nvlist_t **spares, **l2cache, *nv;
	uint64_t txg = 0;
	uint_t nspares, nl2cache;
	int error = 0, error_log;
	boolean_t locked = MUTEX_HELD(&spa_namespace_lock);
	sysevent_t *ev = NULL;
	char *vd_type = NULL, *vd_path = NULL;

	ASSERT(spa_writeable(spa));

	if (!locked)
		txg = spa_vdev_enter(spa);

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
		error = (spa_has_checkpoint(spa)) ?
		    ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;

		if (!locked)
			return (spa_vdev_exit(spa, NULL, txg, error));

		return (error);
	}

	vd = spa_lookup_by_guid(spa, guid, B_FALSE);

	if (spa->spa_spares.sav_vdevs != NULL &&
	    nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
	    ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 &&
	    (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) {
		/*
		 * Only remove the hot spare if it's not currently in use
		 * in this pool.
		 */
		if (vd == NULL || unspare) {
			char *type;
			boolean_t draid_spare = B_FALSE;

			if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type)
			    == 0 && strcmp(type, VDEV_TYPE_DRAID_SPARE) == 0)
				draid_spare = B_TRUE;

			if (vd == NULL && draid_spare) {
				error = SET_ERROR(ENOTSUP);
			} else {
				if (vd == NULL)
					vd = spa_lookup_by_guid(spa,
					    guid, B_TRUE);
				ev = spa_event_create(spa, vd, NULL,
				    ESC_ZFS_VDEV_REMOVE_AUX);

				vd_type = VDEV_TYPE_SPARE;
				vd_path = spa_strdup(fnvlist_lookup_string(
				    nv, ZPOOL_CONFIG_PATH));