projects / linux.git / blame
| 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> | |
| 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 LT |
29 | { |
| 30 | struct cdrom_multisession ms_info; | |
| 31 | unsigned int vol_desc_start; | |
| 32 | struct block_device *bdev = sb->s_bdev; | |
| 33 | int i; | |
| 34 | ||
| cb00ea35 CG |
35 | vol_desc_start = 0; |
| 36 | ms_info.addr_format = CDROM_LBA; | |
| 37 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info); | |
| 1da177e4 | 38 | |
| cb00ea35 | 39 | if (i == 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 */ |
| 1da177e4 | 43 | vol_desc_start = ms_info.addr.lba; |
| cb00ea35 | 44 | } else { |
| 1da177e4 LT |
45 | udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i); |
| 46 | } | |
| 47 | return vol_desc_start; | |
| 48 | } | |
| 49 | ||
| cb00ea35 | 50 | unsigned long udf_get_last_block(struct super_block *sb) |
| 1da177e4 LT |
51 | { |
| 52 | struct block_device *bdev = sb->s_bdev; | |
| 53 | unsigned long lblock = 0; | |
| 54 | ||
| 24a5d59f JK |
55 | /* |
| 56 | * ioctl failed or returned obviously bogus value? | |
| 57 | * Try using the device size... | |
| 58 | */ | |
| 59 | if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) || | |
| 60 | lblock == 0) | |
| 23bcda11 | 61 | lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits; |
| 1da177e4 LT |
62 | |
| 63 | if (lblock) | |
| 64 | return lblock - 1; | |
| 65 | else | |
| 66 | return 0; | |
| 67 | } |