spa_load
return (spa_load(spa, state, SPA_IMPORT_EXISTING));
load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING);
error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING);
error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE);