1/*	$NetBSD: dkio.h,v 1.3 2010/02/21 01:46:35 darran Exp $	*/
2
3/*
4 * CDDL HEADER START
5 *
6 * The contents of this file are subject to the terms of the
7 * Common Development and Distribution License (the "License").
8 * You may not use this file except in compliance with the License.
9 *
10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11 * or http://www.opensolaris.org/os/licensing.
12 * See the License for the specific language governing permissions
13 * and limitations under the License.
14 *
15 * When distributing Covered Code, include this CDDL HEADER in each
16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17 * If applicable, add the following below this CDDL HEADER, with the
18 * fields enclosed by brackets "[]" replaced with your own identifying
19 * information: Portions Copyright [yyyy] [name of copyright owner]
20 *
21 * CDDL HEADER END
22 */
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#ifndef _OPENSOLARIS_SYS_DKIO_H_
29#define	_OPENSOLARIS_SYS_DKIO_H_
30
31
32#ifdef	__cplusplus
33extern "C" {
34#endif
35
36/*
37 * Disk io control commands
38 * Warning: some other ioctls with the DIOC prefix exist elsewhere.
39 * The Generic DKIOC numbers are from	0   -  50.
40 *	The Floppy Driver uses		51  - 100.
41 *	The Hard Disk (except SCSI)	101 - 106.	(these are obsolete)
42 *	The CDROM Driver		151 - 200.
43 *	The USCSI ioctl			201 - 250.
44 */
45#define	DKIOC		(0x04 << 8)
46
47/*
48 * The following ioctls are generic in nature and need to be
49 * suported as appropriate by all disk drivers
50 */
51#define	DKIOCGGEOM	(DKIOC|1)		/* Get geometry */
52#define	DKIOCINFO	(DKIOC|3)		/* Get info */
53#define	DKIOCEJECT	(DKIOC|6)		/* Generic 'eject' */
54#define	DKIOCGVTOC	(DKIOC|11)		/* Get VTOC */
55#define	DKIOCSVTOC	(DKIOC|12)		/* Set VTOC & Write to Disk */
56
57/*
58 * Disk Cache Controls.  These ioctls should be supported by
59 * all disk drivers.
60 *
61 * DKIOCFLUSHWRITECACHE when used from user-mode ignores the ioctl
62 * argument, but it should be passed as NULL to allow for future
63 * reinterpretation.  From user-mode, this ioctl request is synchronous.
64 *
65 * When invoked from within the kernel, the arg can be NULL to indicate
66 * a synchronous request or can be the address of a struct dk_callback
67 * to request an asynchronous callback when the flush request is complete.
68 * In this case, the flag to the ioctl must include FKIOCTL and the
69 * dkc_callback field of the pointed to struct must be non-null or the
70 * request is made synchronously.
71 *
72 * In the callback case: if the ioctl returns 0, a callback WILL be performed.
73 * If the ioctl returns non-zero, a callback will NOT be performed.
74 * NOTE: In some cases, the callback may be done BEFORE the ioctl call
75 * returns.  The caller's locking strategy should be prepared for this case.
76 */
77#define	DKIOCFLUSHWRITECACHE	(DKIOC|34)	/* flush cache to phys medium */
78
79struct dk_callback {
80	void (*dkc_callback)(void *dkc_cookie, int error);
81	void *dkc_cookie;
82};
83
84#ifdef	__cplusplus
85}
86#endif
87
88#include_next <sys/dkio.h>
89
90#endif /* _OPENSOLARIS_SYS_DKIO_H_ */
91