blkatoff
err = blkatoff(tdp, offset, (char **)&ep, &fbp);
err = blkatoff(tdp, offset, (char **)&ep, &fbp);
err = blkatoff(tdp, offset, (char **)0, &fbp);
err = blkatoff(dp, (off_t)0, (char **)&dirp, &fbp);
err = blkatoff(dp, slotp->offset, (char **)&slotp->ep,
err = blkatoff(ip, (off_t)0, (char **)&dirp, &fbp);
err = blkatoff(ip, 0, NULL, &fbp);
err = blkatoff(dp, offset, (char **)0, &fbp);
err = blkatoff(dp, offset, (char **)0, &fbp);
err = blkatoff(dp, offset, (char **)0, &fbp);
err = blkatoff(dp, offset, (char **)0, &fbp);
extern int blkatoff(struct inode *, off_t, char **, struct fbuf **);