udf: stop using ioctl_by_bdev

unsigned int udf_get_last_session(struct super_block *sb)

{

	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);

	struct cdrom_multisession ms_info;

	unsigned int vol_desc_start;

	struct block_device *bdev = sb->s_bdev;

	int i;

	vol_desc_start = 0;

	ms_info.addr_format = CDROM_LBA;

	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info);

	if (!cdi) {

		udf_debug("CDROMMULTISESSION not supported.\n");

		return 0;

	}

	if (i == 0) {

	ms_info.addr_format = CDROM_LBA;

	if (cdrom_multisession(cdi, &ms_info) == 0) {

		udf_debug("XA disk: %s, vol_desc_start=%d\n",

			  ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba);

		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */

			vol_desc_start = ms_info.addr.lba;

	} else {

		udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);

			return ms_info.addr.lba;

	}

	return vol_desc_start;

	return 0;

}

unsigned long udf_get_last_block(struct super_block *sb)

{

	struct block_device *bdev = sb->s_bdev;

	struct cdrom_device_info *cdi = disk_to_cdi(bdev->bd_disk);

	unsigned long lblock = 0;

	/*

	 * ioctl failed or returned obviously bogus value?

	 * The cdrom layer call failed or returned obviously bogus value?

	 * Try using the device size...

	 */

	if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) ||

	    lblock == 0)

	if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0)

		lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits;

	if (lblock)

		return lblock - 1;

	else

	return 0;

}