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diff --git a/scsi/compat_30.h b/scsi/compat_30.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: compat_30.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	4/91
+ *
+ *	Compatibility defs to retrofit Mach 3.0 drivers
+ *	into Mach 2.6.
+ */
+
+#ifndef	_SCSI_COMPAT_30_
+#define	_SCSI_COMPAT_30_
+
+#include <kern/assert.h>
+
+#ifdef	MACH_KERNEL
+/*
+ * Mach 3.0 compiles with these definitions
+ */
+
+#include <device/param.h>
+#include <device/io_req.h>
+#include <device/device_types.h>
+#include <device/disk_status.h>
+
+/*
+ * Scratch temporary in io_req structure (for error handling)
+ */
+#define	io_temporary	io_error
+
+#else	/*MACH_KERNEL*/
+/*
+ * Mach 2.x compiles with these definitions
+ */
+
+/* ??? */
+typedef	int	dev_mode_t;
+typedef int	*dev_status_t;	/* Variable-length array of integers */
+/* ??? */
+
+/* Buffer structures */
+
+typedef	int	io_return_t;
+
+#include <sys/param.h>
+#include <sys/buf.h>
+
+#define	io_req	buf
+typedef	struct buf	*io_req_t;
+
+#define	io_req_alloc(ior,size)	ior = geteblk(size)
+#define	io_req_free(ior)	brelse(ior)
+
+/*
+ * Redefine fields for drivers using new names
+ */
+#define	io_op		b_flags
+#define	io_count	b_bcount
+#define	io_error	b_error
+#define	io_unit		b_dev
+#define	io_recnum	b_blkno
+#define	io_residual	b_resid
+#define	io_data		b_un.b_addr
+#define	io_done		b_iodone
+
+/*
+ * Redefine fields for driver request list heads, using new names.
+ */
+#define	io_next		av_forw
+#define	io_prev		av_back
+/*#define	io_next		b_actf*/
+/*#define	io_prev		b_actl*/
+#define	io_link		b_forw
+#define	io_rlink	b_back
+/*#define	io_count	b_active*/
+/*#define	io_residual	b_errcnt*/
+#define	io_alloc_size	b_bufsize
+
+/*
+ * Scratch temporary in io_req structure (for error handling)
+ */
+#define	io_temporary	b_pfcent
+
+/*
+ * Redefine flags
+ */
+#define	IO_WRITE	B_WRITE
+#define	IO_READ		B_READ
+#define	IO_OPEN		B_OPEN
+#define	IO_DONE		B_DONE
+#define	IO_ERROR	B_ERROR
+#define	IO_BUSY		B_BUSY
+#define	IO_WANTED	B_WANTED
+#define	IO_BAD		B_BAD
+#define	IO_CALL		B_CALL
+#define	IO_INTERNAL	B_MD1
+
+#define	IO_SPARE_START	B_MD1
+
+#include <sys/disklabel.h>
+
+/* Error codes */
+
+#include <sys/errno.h>
+
+#define	D_SUCCESS		ESUCCESS
+#define	D_IO_ERROR		EIO
+#define	D_NO_SUCH_DEVICE	ENXIO
+#define	D_INVALID_SIZE		EINVAL
+#define	D_ALREADY_OPEN		EBUSY
+#define	D_INVALID_OPERATION	EINVAL
+#define D_NO_MEMORY		ENOMEM
+#define D_WOULD_BLOCK		EWOULDBLOCK
+#define D_DEVICE_DOWN		EIO
+#define	D_READ_ONLY		EROFS
+
+/*
+ * Debugging support
+ */
+#define db_printf		kdbprintf
+#define db_printsym(s,m)	kdbpsymoff(s,1,"")
+
+/*
+ * Miscellaneous utils
+ */
+
+#define	check_memory(addr,dow)	((dow) ? wbadaddr(addr,4) : badaddr(addr,4))
+
+#include <sys/kernel.h>		/* for hz */
+#include <scsi/adapters/scsi_user_dma.h>
+
+#ifdef	DECSTATION
+#include <mach/mips/vm_param.h>	/* for page size */
+#define	ULTRIX_COMPAT	1	/* support for rzdisk disk formatter  */
+#endif	/*DECSTATION*/
+
+#endif	/*MACH_KERNEL*/
+
+#endif	/*_SCSI_COMPAT_30_*/