android_kernel_xiaomi_sm8350/fs/udf/lowlevel.c
Christoph Hellwig 15aebd2866 udf: move headers out include/linux/
There's really no reason to keep udf headers in include/linux as they're
not used by anything but fs/udf/.

This patch merges most of include/linux/udf_fs_i.h into fs/udf/udf_i.h,
include/linux/udf_fs_sb.h into fs/udf/udf_sb.h and
include/linux/udf_fs.h into fs/udf/udfdecl.h.

The only thing remaining in include/linux/ is a stub of udf_fs_i.h
defining the four user-visible udf ioctls.  It's also moved from
unifdef-y to headers-y because it can be included unconditionally now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2008-04-17 14:22:23 +02:00

67 lines
1.5 KiB
C

/*
* lowlevel.c
*
* PURPOSE
* Low Level Device Routines for the UDF filesystem
*
* 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) 1999-2001 Ben Fennema
*
* HISTORY
*
* 03/26/99 blf Created.
*/
#include "udfdecl.h"
#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <asm/uaccess.h>
#include "udf_sb.h"
unsigned int udf_get_last_session(struct super_block *sb)
{
struct cdrom_multisession ms_info;
unsigned int vol_desc_start;
struct block_device *bdev = sb->s_bdev;
int i;
vol_desc_start = 0;
ms_info.addr_format = CDROM_LBA;
i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info);
#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);
}
return vol_desc_start;
}
unsigned long udf_get_last_block(struct super_block *sb)
{
struct block_device *bdev = sb->s_bdev;
unsigned long lblock = 0;
if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock))
lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits;
if (lblock)
return lblock - 1;
else
return 0;
}