Nice, I always hated these double-indented switch statements.

quoted text
> +	case FIBMAP:
> +	{
> +		struct address_space *mapping = filp->f_mapping;
> +		int res;
> +		/* do we support this mess? */
> +		if (!mapping->a_ops->bmap)
> +			return -EINVAL;
> +		if (!capable(CAP_SYS_RAWIO))
> +			return -EPERM;
> +		error = get_user(block, p);
> +		if (error)
> +			return error;
> +		lock_kernel();
> +		res = mapping->a_ops->bmap(mapping, block);
> +		unlock_kernel();
> +		return put_user(res, p);

While you're at it, it's probably worth splitting this out into
a small helper function.

quoted text
> +	case FIONBIO:
> +		error = get_user(on, (int __user *)arg);
> +		if (error)
> +			break;
> +		flag = O_NONBLOCK;
>  #ifdef __sparc__
> +		/* SunOS compatibility item. */
> +		if (O_NONBLOCK != O_NDELAY)
> +			flag |= O_NDELAY;
>  #endif
> +		if (on)
> +			filp->f_flags |= flag;
> +		else
> +			filp->f_flags &= ~flag;
> +		break;

Same here.

quoted text
> +	case FIOASYNC:
> +		error = get_user(on, (int __user *)arg);
> +		if (error)
>  			break;
> +		flag = on ? FASYNC : 0;
> +
> +		/* Did FASYNC state change ? */
> +		if ((flag ^ filp->f_flags) & FASYNC) {
> +			if (filp->f_op && filp->f_op->fasync) {
> +				lock_kernel();
> +				error = filp->f_op->fasync(fd, filp, on);
> +				unlock_kernel();
> +			} else
>  				error = -ENOTTY;
> +		}
> +		if (error != 0)
>  			break;
> +
> +		if (on)
> +			filp->f_flags |= FASYNC;
> +		else
> +			filp->f_flags &= ~FASYNC;
> +		break;

And here.

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