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@hootie.lvld.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) 1999-2000 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
32 typedef struct scsi_device Scsi_Device;
33 typedef 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
40 unsigned int
41 udf_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
70 unsigned int
71 udf_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
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