| | 1 | /* |
| | 2 | * lowlevel.c |
| | 3 | * |
| | 4 | * PURPOSE |
| | 5 | * Low Level Device Routines for the UDF filesystem |
| | 6 | * |
| | 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 <linux/uaccess.h> |
| | 25 | |
| | 26 | #include "udf_sb.h" |
| | 27 | |
| | 28 | unsigned int udf_get_last_session(struct super_block *sb) |
| | 29 | { |
| | 30 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
| | 31 | struct cdrom_multisession ms_info; |
| | 32 | |
| | 33 | if (!cdi) { |
| | 34 | udf_debug("CDROMMULTISESSION not supported.\n"); |
| | 35 | return 0; |
| | 36 | } |
| | 37 | |
| | 38 | ms_info.addr_format = CDROM_LBA; |
| | 39 | if (cdrom_multisession(cdi, &ms_info) == 0) { |
| | 40 | udf_debug("XA disk: %s, vol_desc_start=%d\n", |
| | 41 | ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba); |
| | 42 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
| | 43 | return ms_info.addr.lba; |
| | 44 | } |
| | 45 | return 0; |
| | 46 | } |
| | 47 | |
| | 48 | unsigned long udf_get_last_block(struct super_block *sb) |
| | 49 | { |
| | 50 | struct block_device *bdev = sb->s_bdev; |
| | 51 | struct cdrom_device_info *cdi = disk_to_cdi(bdev->bd_disk); |
| | 52 | unsigned long lblock = 0; |
| | 53 | |
| | 54 | /* |
| | 55 | * The cdrom layer call failed or returned obviously bogus value? |
| | 56 | * Try using the device size... |
| | 57 | */ |
| | 58 | if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0) |
| | 59 | lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits; |
| | 60 | |
| | 61 | if (lblock) |
| | 62 | return lblock - 1; |
| | 63 | return 0; |
| | 64 | } |
projects / mirror_ubuntu-jammy-kernel.git / blame_incremental