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/*
* lowlevel.c
*
* PURPOSE
* Low Level Device Routines for the UDF filesystem
*
* CONTACTS
* E-mail regarding any portion of the Linux UDF file system should be
* directed to the development team mailing list (run by majordomo):
* linux_udf@hootie.lvld.hp.com
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (C) 1999 Ben Fennema
*
* HISTORY
*
* 03/26/99 blf Created.
*/
#include "udfdecl.h"
#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
typedef struct scsi_device Scsi_Device;
typedef struct scsi_cmnd Scsi_Cmnd;
#include <scsi/scsi_ioctl.h>
#include <linux/udf_fs.h>
#include "udf_sb.h"
unsigned int
udf_get_last_session(kdev_t dev)
{
struct cdrom_multisession ms_info;
unsigned int vol_desc_start;
struct inode inode_fake;
extern struct file_operations * get_blkfops(unsigned int);
int i;
vol_desc_start=0;
if (get_blkfops(MAJOR(dev))->ioctl!=NULL)
{
/* Whoops. We must save the old FS, since otherwise
* we would destroy the kernels idea about FS on root
* mount in read_super... [chexum]
*/
mm_segment_t old_fs=get_fs();
inode_fake.i_rdev=dev;
ms_info.addr_format=CDROM_LBA;
set_fs(KERNEL_DS);
i=get_blkfops(MAJOR(dev))->ioctl(&inode_fake,
NULL,
CDROMMULTISESSION,
(unsigned long) &ms_info);
set_fs(old_fs);
#define WE_OBEY_THE_WRITTEN_STANDARDS 1
if (i == 0)
{
udf_debug("XA disk: %s, vol_desc_start=%d\n",
(ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba);
#if WE_OBEY_THE_WRITTEN_STANDARDS
if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
#endif
vol_desc_start = ms_info.addr.lba;
}
else
{
udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);
}
}
else
{
udf_debug("Device doesn't know how to ioctl?\n");
}
return vol_desc_start;
}
unsigned int
udf_get_last_block(kdev_t dev, int *flags)
{
extern int *blksize_size[];
struct inode inode_fake;
extern struct file_operations * get_blkfops(unsigned int);
int ret;
unsigned long lblock;
unsigned int hbsize = get_hardblocksize(dev);
unsigned int secsize = 512;
unsigned int mult = 0;
unsigned int div = 0;
if (!hbsize)
hbsize = blksize_size[MAJOR(dev)][MINOR(dev)];
if (secsize > hbsize)
mult = secsize / hbsize;
else if (hbsize > secsize)
div = hbsize / secsize;
if (get_blkfops(MAJOR(dev))->ioctl!=NULL)
{
/* Whoops. We must save the old FS, since otherwise
* we would destroy the kernels idea about FS on root
* mount in read_super... [chexum]
*/
mm_segment_t old_fs=get_fs();
inode_fake.i_rdev=dev;
set_fs(KERNEL_DS);
lblock = 0;
ret = get_blkfops(MAJOR(dev))->ioctl(&inode_fake,
NULL,
BLKGETSIZE,
(unsigned long) &lblock);
if (!ret) /* Hard Disk */
{
if (mult)
lblock *= mult;
else if (div)
lblock /= div;
}
else /* CDROM */
{
ret = get_blkfops(MAJOR(dev))->ioctl(&inode_fake,
NULL,
CDROM_LAST_WRITTEN,
(unsigned long) &lblock);
}
set_fs(old_fs);
if (!ret && lblock)
return lblock - 1;
}
else
{
udf_debug("Device doesn't know how to ioctl?\n");
}
return 0;
}
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