dm_kcopyd_zero
EXPORT_SYMBOL(dm_kcopyd_zero);
dm_kcopyd_zero(s->kcopyd_client, 1, &dest, 0, zero_callback, bio);
dm_kcopyd_zero(tc->pool->copier, 1, &to, 0, copy_complete, m);
dm_kcopyd_zero(allocator->eraser, 1, regions, 0, copy_callback, allocator);
void dm_kcopyd_zero(struct dm_kcopyd_client *kc,