STRIPE_EXPANDING
if (!test_bit(STRIPE_EXPANDING, &sh->state)) {
if (!test_bit(STRIPE_EXPANDING, &sh2->state) ||
clear_bit(STRIPE_EXPANDING, &sh->state);
if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
if (test_bit(STRIPE_EXPANDING, &sh->state)) {
set_bit(STRIPE_EXPANDING, &sh->state);
!test_bit(STRIPE_EXPANDING, &sh->state));
(1 << STRIPE_EXPANDING) |\