1 files changed, 67 insertions, 0 deletions
diff --git a/fs/udf/lowlevel.c b/fs/udf/lowlevel.c
new file mode 100644
index 000000000..5c7ec1219
--- /dev/null
+++ b/fs/udf/lowlevel.c
@@ -0,0 +1,67 @@
+/*
+ * 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;
+}