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 } 78