Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * lowlevel.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Low Level Device Routines for the UDF filesystem | |
6 | * | |
1da177e4 LT |
7 | * COPYRIGHT |
8 | * This file is distributed under the terms of the GNU General Public | |
9 | * License (GPL). Copies of the GPL can be obtained from: | |
10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
11 | * Each contributing author retains all rights to their own work. | |
12 | * | |
13 | * (C) 1999-2001 Ben Fennema | |
14 | * | |
15 | * HISTORY | |
16 | * | |
17 | * 03/26/99 blf Created. | |
18 | */ | |
19 | ||
20 | #include "udfdecl.h" | |
21 | ||
22 | #include <linux/blkdev.h> | |
23 | #include <linux/cdrom.h> | |
24 | #include <asm/uaccess.h> | |
25 | ||
26 | #include <linux/udf_fs.h> | |
27 | #include "udf_sb.h" | |
28 | ||
cb00ea35 | 29 | unsigned int udf_get_last_session(struct super_block *sb) |
1da177e4 LT |
30 | { |
31 | struct cdrom_multisession ms_info; | |
32 | unsigned int vol_desc_start; | |
33 | struct block_device *bdev = sb->s_bdev; | |
34 | int i; | |
35 | ||
cb00ea35 CG |
36 | vol_desc_start = 0; |
37 | ms_info.addr_format = CDROM_LBA; | |
38 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info); | |
1da177e4 LT |
39 | |
40 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
41 | ||
cb00ea35 | 42 | if (i == 0) { |
1da177e4 | 43 | udf_debug("XA disk: %s, vol_desc_start=%d\n", |
cb00ea35 | 44 | (ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba); |
1da177e4 | 45 | #if WE_OBEY_THE_WRITTEN_STANDARDS |
cb00ea35 | 46 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 LT |
47 | #endif |
48 | vol_desc_start = ms_info.addr.lba; | |
cb00ea35 | 49 | } else { |
1da177e4 LT |
50 | udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i); |
51 | } | |
52 | return vol_desc_start; | |
53 | } | |
54 | ||
cb00ea35 | 55 | unsigned long udf_get_last_block(struct super_block *sb) |
1da177e4 LT |
56 | { |
57 | struct block_device *bdev = sb->s_bdev; | |
58 | unsigned long lblock = 0; | |
59 | ||
cb00ea35 | 60 | if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long)&lblock)) |
1da177e4 LT |
61 | lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits; |
62 | ||
63 | if (lblock) | |
64 | return lblock - 1; | |
65 | else | |
66 | return 0; | |
67 | } |