spa_add
spa = spa_add(poolname, nvl, altroot);
spa = spa_add(pname, config, NULL);
spa = spa_add(pool, config, altroot);
spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL);
newspa = spa_add(newname, config, altroot);
(void) spa_add(nvpair_name(nvpair), child, NULL);
extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);