bno = ((ino - 1)/INOPB) + 2;
dread(bno, buf, BSIZE);
copy((char *) b, &buf[((inum-1)%INOPB)*sizeof(struct dinode)], sizeof(struct dinode));
bno = ((ino - 1)/INOPB) + 2;
dread(bno, buf, BSIZE);
copy((char *) b, &buf[((inum-1)%INOPB)*sizeof(struct dinode)], sizeof(struct dinode));