METRIC_READ
rsize->total_ops = cpu_to_le64(m->metric[METRIC_READ].total);
rsize->total_size = cpu_to_le64(m->metric[METRIC_READ].size_sum);
sum = m->metric[METRIC_READ].latency_sum;
ktime_to_ceph_timespec(&read->avg, m->metric[METRIC_READ].latency_avg);
read->sq_sum = cpu_to_le64(m->metric[METRIC_READ].latency_sq_sum);
read->count = cpu_to_le64(m->metric[METRIC_READ].total);
ceph_update_metrics(&m->metric[METRIC_READ],