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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> | |
e973606c | 24 | #include <linux/uaccess.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include "udf_sb.h" |
27 | ||
cb00ea35 | 28 | unsigned int udf_get_last_session(struct super_block *sb) |
1da177e4 | 29 | { |
8b075e5b | 30 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
1da177e4 | 31 | struct cdrom_multisession ms_info; |
1da177e4 | 32 | |
8b075e5b CH |
33 | if (!cdi) { |
34 | udf_debug("CDROMMULTISESSION not supported.\n"); | |
35 | return 0; | |
36 | } | |
1da177e4 | 37 | |
8b075e5b CH |
38 | ms_info.addr_format = CDROM_LBA; |
39 | if (cdrom_multisession(cdi, &ms_info) == 0) { | |
1da177e4 | 40 | udf_debug("XA disk: %s, vol_desc_start=%d\n", |
a983f368 | 41 | ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba); |
28de7948 | 42 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
8b075e5b | 43 | return ms_info.addr.lba; |
1da177e4 | 44 | } |
8b075e5b | 45 | return 0; |
1da177e4 LT |
46 | } |
47 | ||
cb00ea35 | 48 | unsigned long udf_get_last_block(struct super_block *sb) |
1da177e4 LT |
49 | { |
50 | struct block_device *bdev = sb->s_bdev; | |
8b075e5b | 51 | struct cdrom_device_info *cdi = disk_to_cdi(bdev->bd_disk); |
1da177e4 LT |
52 | unsigned long lblock = 0; |
53 | ||
24a5d59f | 54 | /* |
8b075e5b | 55 | * The cdrom layer call failed or returned obviously bogus value? |
24a5d59f JK |
56 | * Try using the device size... |
57 | */ | |
8b075e5b | 58 | if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0) |
23bcda11 | 59 | lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits; |
1da177e4 LT |
60 | |
61 | if (lblock) | |
62 | return lblock - 1; | |
8b075e5b | 63 | return 0; |
1da177e4 | 64 | } |