gen.h

#pragma once

#include <cstdint>

#define DEFAULT_SERIAL "12345678"
#define FILENAME       "test.dat"

static_assert(sizeof(size_t) >= 4);
static_assert(sizeof(int) >= 2);

struct data_descriptor {
	uint64_t lba;
	uint32_t n_sectors;
};

struct io_stats_t {
	uint64_t n_reads        { 0 };
	uint64_t bytes_read     { 0 };
	uint64_t n_writes       { 0 };
	uint64_t bytes_written  { 0 };
	uint64_t n_syncs        { 0 };
	uint64_t blocks_trimmed { 0 };
	// 1.3.6.1.4.1.2021.11.54: "The number of 'ticks' (typically 1/100s) spent waiting for IO."
	// https://www.circitor.fr/Mibs/Html/U/UCD-SNMP-MIB.php#ssCpuRawWait
	uint64_t io_wait        { 0 };

	io_stats_t() {
	}

	uint64_t get_n_iops() const {
		return n_reads + n_writes;
	}

	void reset() {
		n_reads        = 0;
		bytes_read     = 0;
		n_writes       = 0;
		bytes_written  = 0;
		n_syncs        = 0;
		blocks_trimmed = 0;
		io_wait        = 0;
	}
};