1 | // SPDX-License-Identifier: GPL-2.0-only |
---|---|
2 | /* |
3 | * lowlevel.c |
4 | * |
5 | * PURPOSE |
6 | * Low Level Device Routines for the UDF filesystem |
7 | * |
8 | * COPYRIGHT |
9 | * (C) 1999-2001 Ben Fennema |
10 | * |
11 | * HISTORY |
12 | * |
13 | * 03/26/99 blf Created. |
14 | */ |
15 | |
16 | #include "udfdecl.h" |
17 | |
18 | #include <linux/blkdev.h> |
19 | #include <linux/cdrom.h> |
20 | #include <linux/uaccess.h> |
21 | |
22 | #include "udf_sb.h" |
23 | |
24 | unsigned int udf_get_last_session(struct super_block *sb) |
25 | { |
26 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
27 | struct cdrom_multisession ms_info; |
28 | |
29 | if (!cdi) { |
30 | udf_debug("CDROMMULTISESSION not supported.\n"); |
31 | return 0; |
32 | } |
33 | |
34 | ms_info.addr_format = CDROM_LBA; |
35 | if (cdrom_multisession(cdi, info: &ms_info) == 0) { |
36 | udf_debug("XA disk: %s, vol_desc_start=%d\n", |
37 | ms_info.xa_flag ? "yes": "no", ms_info.addr.lba); |
38 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
39 | return ms_info.addr.lba; |
40 | } |
41 | return 0; |
42 | } |
43 | |
44 | udf_pblk_t udf_get_last_block(struct super_block *sb) |
45 | { |
46 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
47 | unsigned long lblock = 0; |
48 | |
49 | /* |
50 | * The cdrom layer call failed or returned obviously bogus value? |
51 | * Try using the device size... |
52 | */ |
53 | if (!cdi || cdrom_get_last_written(cdi, last_written: &lblock) || lblock == 0) { |
54 | if (sb_bdev_nr_blocks(sb) > ~(udf_pblk_t)0) |
55 | return 0; |
56 | lblock = sb_bdev_nr_blocks(sb); |
57 | } |
58 | |
59 | if (lblock) |
60 | return lblock - 1; |
61 | return 0; |
62 | } |
63 |