pr_dblock
pr_dblock(log_print, start);
pr_dblock(nolog_print, curnt);
pr_dblock(nolog_print, curnt);
pr_dblock(log_print, scan_cur_block);
pr_dblock(log_print, scan_cur_block);
pr_dblock(fmt_print, bn);
pr_dblock(err_print, blkno);
pr_dblock(err_print, blkno);
pr_dblock(err_print, blkno);
pr_dblock(err_print, blkno);
pr_dblock(fmt_print, *(diskaddr_t *)deflt);
pr_dblock(fmt_print, bounds->lower);
pr_dblock(fmt_print, bounds->upper);
pr_dblock(err_print, bn64);
void pr_dblock(void (*func)(char *, ...), diskaddr_t bn);
pr_dblock(fmt_print, scan_lower);
pr_dblock(fmt_print, scan_upper);
pr_dblock(fmt_print, (diskaddr_t)scan_size);
pr_dblock(fmt_print, bn);
pr_dblock(fmt_print, bn);
pr_dblock(fmt_print, bn);
pr_dblock(fmt_print, nblks);
pr_dblock(log_print, scan_cur_block);