GD_ADDED
!test_bit(GD_ADDED, &disk->state))
if (test_bit(GD_ADDED, &disk->state) && disk->fops->free_disk)
set_bit(GD_ADDED, &disk->state);
if (!test_bit(GD_ADDED, &head->disk->state))
if (!test_bit(GD_ADDED, &ns->disk->state))