lowlevel.c

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    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 <asm/uaccess.h>
   25 
   26 #include "udf_sb.h"
   27 
   28 unsigned int udf_get_last_session(struct super_block *sb)
   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 
   35         vol_desc_start = 0;
   36         ms_info.addr_format = CDROM_LBA;
   37         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info);
   38 
   39         if (i == 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                         vol_desc_start = ms_info.addr.lba;
   44         } else {
   45                 udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);
   46         }
   47         return vol_desc_start;
   48 }
   49 
   50 unsigned long udf_get_last_block(struct super_block *sb)
   51 {
   52         struct block_device *bdev = sb->s_bdev;
   53         unsigned long lblock = 0;
   54 
   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)
   61                 lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits;
   62 
   63         if (lblock)
   64                 return lblock - 1;
   65         else
   66                 return 0;
   67 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/udf/lowlevel.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/lowlevel.c