dblksize
(long)dblksize(sblock, &di, i),
(long)dblksize(&sblock, dp, lastbn + 1));
(long)dblksize(&sblock, dp, lastbn + 1));
block_size = dblksize(fs, &fp->f_di, file_block);
block_size = dblksize(fs, &fp->f_di, file_block);