workqueue_set_max_active
workqueue_set_max_active(wq->normal_wq, wq->current_active);
workqueue_set_max_active(fs_info->endio_workers, new_pool_size);
workqueue_set_max_active(fs_info->endio_meta_workers, new_pool_size);
extern void workqueue_set_max_active(struct workqueue_struct *wq,
EXPORT_SYMBOL_GPL(workqueue_set_max_active);
workqueue_set_max_active(wq, val);