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/*

 * lowlevel.c

 *

 * PURPOSE

 *  Low Level Device Routines for the UDF filesystem

 *

 * CONTACTS

 *      E-mail regarding any portion of the Linux UDF file system should be

 *      directed to the development team mailing list (run by majordomo):

 *              linux_udf@hpesjro.fc.hp.com

 *

 * COPYRIGHT

 *      This file is distributed under the terms of the GNU General Public

 *      License (GPL). Copies of the GPL can be obtained from:

 *              ftp://prep.ai.mit.edu/pub/gnu/GPL

 *      Each contributing author retains all rights to their own work.

 *

 *  (C) 1999-2001 Ben Fennema

 *

 * HISTORY

 *

 *  03/26/99 blf  Created.

 */

#include "udfdecl.h"

#include <linux/blkdev.h>

#include <linux/cdrom.h>

#include <asm/uaccess.h>

#include <scsi/scsi.h>

typedef struct scsi_device Scsi_Device;

typedef struct scsi_cmnd   Scsi_Cmnd;

#include <scsi/scsi_ioctl.h>

#include <linux/udf_fs.h>

#include "udf_sb.h"

unsigned int

udf_get_last_session(struct super_block *sb)

{

        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);

#define WE_OBEY_THE_WRITTEN_STANDARDS 1

        if (i == 0)

        {

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

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

#if WE_OBEY_THE_WRITTEN_STANDARDS

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

#endif

                        vol_desc_start = ms_info.addr.lba;

        }

        else

        {

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

        }

        return vol_desc_start;

}

unsigned long

udf_get_last_block(struct super_block *sb)

{

        struct block_device *bdev = sb->s_bdev;

        int ret;

        unsigned long lblock = 0;

        ret = ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock);

        if (ret) /* Hard Disk */

        {

                ret = ioctl_by_bdev(bdev, BLKGETSIZE, (unsigned long) &lblock);

                if (!ret && lblock != 0x7FFFFFFF)

                        lblock = ((512 * lblock) / sb->s_blocksize);

        }

        if (!ret && lblock)

                return lblock - 1;

        else

                return 0;

}