verity_hash
if (unlikely(verity_hash(v, io, data, 1 << v->data_dev_block_bits,
r = verity_hash(v, io, fio->output, 1 << v->data_dev_block_bits,
r = verity_hash(v, io, zero_data, 1 << v->data_dev_block_bits,
r = verity_hash(v, io, data, 1 << v->hash_dev_block_bits,
r = verity_hash(v, io, buffer, 1 << v->data_dev_block_bits,
r = verity_hash(v, io, io->pending_blocks[i].data,
extern int verity_hash(struct dm_verity *v, struct dm_verity_io *io,