1/*
2 * lowlevel.c
3 *
4 * PURPOSE
5 *  Low Level Device Routines for the UDF filesystem
6 *
7 * CONTACTS
8 *	E-mail regarding any portion of the Linux UDF file system should be
9 *	directed to the development team mailing list (run by majordomo):
10 *		linux_udf@hpesjro.fc.hp.com
11 *
12 * COPYRIGHT
13 *	This file is distributed under the terms of the GNU General Public
14 *	License (GPL). Copies of the GPL can be obtained from:
15 *		ftp://prep.ai.mit.edu/pub/gnu/GPL
16 *	Each contributing author retains all rights to their own work.
17 *
18 *  (C) 1999-2001 Ben Fennema
19 *
20 * HISTORY
21 *
22 *  03/26/99 blf  Created.
23 */
24
25#include "udfdecl.h"
26
27#include <linux/blkdev.h>
28#include <linux/cdrom.h>
29#include <asm/uaccess.h>
30#include <scsi/scsi.h>
31
32typedef struct scsi_device Scsi_Device;
33typedef struct scsi_cmnd   Scsi_Cmnd;
34
35#include <scsi/scsi_ioctl.h>
36
37#include <linux/udf_fs.h>
38#include "udf_sb.h"
39
40unsigned int
41udf_get_last_session(struct super_block *sb)
42{
43	struct cdrom_multisession ms_info;
44	unsigned int vol_desc_start;
45	struct block_device *bdev = sb->s_bdev;
46	int i;
47
48	vol_desc_start=0;
49	ms_info.addr_format=CDROM_LBA;
50	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
51
52#define WE_OBEY_THE_WRITTEN_STANDARDS 1
53
54	if (i == 0)
55	{
56		udf_debug("XA disk: %s, vol_desc_start=%d\n",
57			(ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba);
58#if WE_OBEY_THE_WRITTEN_STANDARDS
59		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
60#endif
61			vol_desc_start = ms_info.addr.lba;
62	}
63	else
64	{
65		udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);
66	}
67	return vol_desc_start;
68}
69
70unsigned long
71udf_get_last_block(struct super_block *sb)
72{
73	struct block_device *bdev = sb->s_bdev;
74	int ret;
75	unsigned long lblock = 0;
76
77	ret = ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock);
78
79	if (ret) /* Hard Disk */
80	{
81		ret = ioctl_by_bdev(bdev, BLKGETSIZE, (unsigned long) &lblock);
82
83		if (!ret && lblock != 0x7FFFFFFF)
84			lblock = ((512 * lblock) / sb->s_blocksize);
85	}
86
87	if (!ret && lblock)
88		return lblock - 1;
89	else
90		return 0;
91}
92