Function vdev_offline_locked

freebsd/contrib/openzfs/module/zfs/vdev.c:3811–3919

}

static int
vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags)
{
	vdev_t *vd, *tvd;
	int error = 0;
	uint64_t generation;
	metaslab_group_t *mg;

top:
	spa_vdev_state_enter(spa, SCL_ALLOC);

	if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
		return (spa_vdev_state_exit(spa, NULL, SET_ERROR(ENODEV)));

	if (!vd->vdev_ops->vdev_op_leaf)
		return (spa_vdev_state_exit(spa, NULL, SET_ERROR(ENOTSUP)));

	if (vd->vdev_ops == &vdev_draid_spare_ops)
		return (spa_vdev_state_exit(spa, NULL, ENOTSUP));

	tvd = vd->vdev_top;
	mg = tvd->vdev_mg;
	generation = spa->spa_config_generation + 1;

	/*
	 * If the device isn't already offline, try to offline it.
	 */
	if (!vd->vdev_offline) {
		/*
		 * If this device has the only valid copy of some data,
		 * don't allow it to be offlined. Log devices are always
		 * expendable.
		 */
		if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
		    vdev_dtl_required(vd))
			return (spa_vdev_state_exit(spa, NULL,
			    SET_ERROR(EBUSY)));

		/*
		 * If the top-level is a slog and it has had allocations
		 * then proceed.  We check that the vdev's metaslab group
		 * is not NULL since it's possible that we may have just
		 * added this vdev but not yet initialized its metaslabs.
		 */
		if (tvd->vdev_islog && mg != NULL) {
			/*
			 * Prevent any future allocations.
			 */
			metaslab_group_passivate(mg);
			(void) spa_vdev_state_exit(spa, vd, 0);

			error = spa_reset_logs(spa);

			/*
			 * If the log device was successfully reset but has
			 * checkpointed data, do not offline it.
			 */
			if (error == 0 &&