i_ffs1_size
lastlbn = lblkno(fs, ip->i_ffs1_size);
if (nb != 0 && ip->i_ffs1_size >=
osize = fragroundup(fs, blkoff(fs, ip->i_ffs1_size));
if (ip->i_ffs1_size < (uint64_t)lblktosize(fs, lbn + 1))