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1da177e4 LT |
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 | ||
31 | #include <linux/udf_fs.h> | |
32 | #include "udf_sb.h" | |
33 | ||
34 | unsigned int | |
35 | udf_get_last_session(struct super_block *sb) | |
36 | { | |
37 | struct cdrom_multisession ms_info; | |
38 | unsigned int vol_desc_start; | |
39 | struct block_device *bdev = sb->s_bdev; | |
40 | int i; | |
41 | ||
42 | vol_desc_start=0; | |
43 | ms_info.addr_format=CDROM_LBA; | |
44 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
45 | ||
46 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
47 | ||
48 | if (i == 0) | |
49 | { | |
50 | udf_debug("XA disk: %s, vol_desc_start=%d\n", | |
51 | (ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba); | |
52 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
53 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ | |
54 | #endif | |
55 | vol_desc_start = ms_info.addr.lba; | |
56 | } | |
57 | else | |
58 | { | |
59 | udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i); | |
60 | } | |
61 | return vol_desc_start; | |
62 | } | |
63 | ||
64 | unsigned long | |
65 | udf_get_last_block(struct super_block *sb) | |
66 | { | |
67 | struct block_device *bdev = sb->s_bdev; | |
68 | unsigned long lblock = 0; | |
69 | ||
70 | if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock)) | |
71 | lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
72 | ||
73 | if (lblock) | |
74 | return lblock - 1; | |
75 | else | |
76 | return 0; | |
77 | } |