ocfs2_block_check_compute
ocfs2_block_check_compute(data, sb->s_blocksize, bc);
void ocfs2_block_check_compute(void *data, size_t blocksize,
ocfs2_block_check_compute(data, size, data + ot->ot_offset);
ocfs2_block_check_compute(data, size, &dqt->dq_check);
ocfs2_block_check_compute(data, size, &trailer->db_check);