blkroundup
inobufsize = blkroundup(&sblock,
numblks = blkroundup(fs, bp->b_size) / fs->fs_bsize;
lastlbn = lblkno(fs, blkroundup(fs, size));
inobufsize = blkroundup(&sblock, INOBUFSIZE);
size = blkroundup(fs, fs->fs_cssize);