DM_CLONE_DISCARD_PASSDOWN
count += !test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags);
if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags))
__clear_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags);
__set_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags);
if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags))
clear_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags);
if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags)) {
if (test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags) && success) {