dbtofsb
diskbn = dbtofsb(fs, number);
fsbn = dbtofsb(fs, blkno);
sblock.fs_size = dbtofsb(&osblock, pinfo.media_blocks);
sblock.fs_size = dbtofsb(&osblock, size);
sblock.fs_size = fssize = dbtofsb(&sblock, fssize);
ei->e2di_nblock = htole32(dbtofsb(fs, ip->i_blocks));
ei->e2di_nblock_high = htole16(dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff);
dbtofsb(&sblock, fssize);
sblock.fs_size = fssize = dbtofsb(&sblock, fssize);