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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [udf/] [lowlevel.c] - Rev 1275
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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@hpesjro.fc.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) 1999-2001 Ben Fennema * * HISTORY * * 03/26/99 blf Created. */ #include "udfdecl.h" #include <linux/blkdev.h> #include <linux/cdrom.h> #include <asm/uaccess.h> #include <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(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; int ret; unsigned long lblock = 0; ret = ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock); if (ret) /* Hard Disk */ { ret = ioctl_by_bdev(bdev, BLKGETSIZE, (unsigned long) &lblock); if (!ret && lblock != 0x7FFFFFFF) lblock = ((512 * lblock) / sb->s_blocksize); } if (!ret && lblock) return lblock - 1; else return 0; }
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