test_bit
if (!test_bit(bitmap, j))
#define test_nattr_flag(na, flag) test_bit(NA_##flag, (na)->state)
#define test_ndev_flag(nd, flag) test_bit(ND_##flag, (nd)->d_state)
#define test_nino_flag(ni, flag) test_bit(NI_##flag, (ni)->state)
const BOOL old_state = test_bit(bit, var); \
const BOOL old_state = test_bit(bit, var); \
#define test_nvol_flag(nv, flag) test_bit(NV_##flag, (nv)->state)