drbd_new_dev_size
extern sector_t drbd_new_dev_size(struct drbd_device *, struct drbd_backing_dev *, sector_t, int);
size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED);
unsigned long long nsz = drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0);
new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0);