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linux
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lowlevel.c
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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_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); if (i == 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 */ 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; /* * ioctl failed or returned obviously bogus value? * Try using the device size... */ if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) || lblock == 0) lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits; if (lblock) return lblock - 1; else return 0; }
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