[linux-block.git] / fs / udf / lowlevel.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * lowlevel.c
 *
 * PURPOSE
 *  Low Level Device Routines for the UDF filesystem
 *
 * COPYRIGHT
 *  (C) 1999-2001 Ben Fennema
 *
 * HISTORY
 *
 *  03/26/99 blf  Created.
 */

#include "udfdecl.h"

#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <linux/uaccess.h>

#include "udf_sb.h"

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;

	if (!cdi) {
		udf_debug("CDROMMULTISESSION not supported.\n");
		return 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 */
			return ms_info.addr.lba;
	}
	return 0;
}

udf_pblk_t udf_get_last_block(struct super_block *sb)
{
	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
	unsigned long lblock = 0;

	/*
	 * The cdrom layer call failed or returned obviously bogus value?
	 * Try using the device size...
	 */
	if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0) {
		if (sb_bdev_nr_blocks(sb) > ~(udf_pblk_t)0)
			return 0;
		lblock = sb_bdev_nr_blocks(sb);
	}

	if (lblock)
		return lblock - 1;
	return 0;
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* lowlevel.c
	4	*
	5	* PURPOSE
	6	* Low Level Device Routines for the UDF filesystem
	7	*
	8	* COPYRIGHT
	9	* (C) 1999-2001 Ben Fennema
	10	*
	11	* HISTORY
	12	*
	13	* 03/26/99 blf Created.
	14	*/
	15
	16	#include "udfdecl.h"
	17
	18	#include <linux/blkdev.h>
	19	#include <linux/cdrom.h>
	20	#include <linux/uaccess.h>
	21
	22	#include "udf_sb.h"
	23
	24	unsigned int udf_get_last_session(struct super_block *sb)
	25	{
	26	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
	27	struct cdrom_multisession ms_info;
	28
	29	if (!cdi) {
	30	udf_debug("CDROMMULTISESSION not supported.\n");
	31	return 0;
	32	}
	33
	34	ms_info.addr_format = CDROM_LBA;
	35	if (cdrom_multisession(cdi, &ms_info) == 0) {
	36	udf_debug("XA disk: %s, vol_desc_start=%d\n",
	37	ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba);
	38	if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
	39	return ms_info.addr.lba;
	40	}
	41	return 0;
	42	}
	43
	44	udf_pblk_t udf_get_last_block(struct super_block *sb)
	45	{
	46	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
	47	unsigned long lblock = 0;
	48
	49	/*
	50	* The cdrom layer call failed or returned obviously bogus value?
	51	* Try using the device size...
	52	*/
	53	if (!cdi \|\| cdrom_get_last_written(cdi, &lblock) \|\| lblock == 0) {
	54	if (sb_bdev_nr_blocks(sb) > ~(udf_pblk_t)0)
	55	return 0;
	56	lblock = sb_bdev_nr_blocks(sb);
	57	}
	58
	59	if (lblock)
	60	return lblock - 1;
	61	return 0;
	62	}