spa_taskq_dispatch_ent
extern void spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio,
spa_taskq_dispatch_ent(spa, ZIO_TYPE_CLAIM,