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- /*
- * 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 <linux/uaccess.h>
- #include "udf_sb.h"
- unsigned int udf_get_last_session(struct super_block *sb)
- {
- struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
- struct cdrom_multisession ms_info;
- if (!cdi) {
- udf_debug("CDROMMULTISESSION not supported.\n");
- return 0;
- }
- ms_info.addr_format = CDROM_LBA;
- if (cdrom_multisession(cdi, &ms_info) == 0) {
- udf_debug("XA disk: %s, vol_desc_start=%d\n",
- ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba);
- if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
- return ms_info.addr.lba;
- }
- return 0;
- }
- unsigned long udf_get_last_block(struct super_block *sb)
- {
- struct block_device *bdev = sb->s_bdev;
- struct cdrom_device_info *cdi = disk_to_cdi(bdev->bd_disk);
- unsigned long lblock = 0;
- /*
- * The cdrom layer call failed or returned obviously bogus value?
- * Try using the device size...
- */
- if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0)
- lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits;
- if (lblock)
- return lblock - 1;
- return 0;
- }
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