NILFS_I_COLLECTED
set_bit(NILFS_I_COLLECTED, &ii->i_state);
set_bit(NILFS_I_COLLECTED, &ii->i_state);
if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
clear_bit(NILFS_I_COLLECTED, &ii->i_state);
if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))