| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |