geom_slice.h revision 104064 
1/*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: head/sys/geom/geom_slice.h 104064 2002-09-27 21:37:11Z phk $
36 */
37
38#ifndef _GEOM_GEOM_SLICE_H_
39#define _GEOM_GEOM_SLICE_H_
40
41struct g_slice {
42	off_t	offset;
43	off_t	length;
44	struct	g_provider *provider;
45};
46
47typedef int g_slice_start_t (struct bio *bp);
48
49struct g_slicer {
50	int		nslice;
51	int		nprovider;
52	off_t		cfrontstuff;
53	off_t		frontstuff;
54	struct g_slice	*slices;
55	void		*softc;
56	g_slice_start_t	*start;
57};
58
59g_dumpconf_t g_slice_dumpconf;
60struct g_provider * g_slice_addslice(struct g_geom *gp, int index, off_t offset, off_t length, char *fmt, ...);
61int g_slice_config(struct g_geom *gp, int index, int how, off_t offset, off_t length, char *fmt, ...);
62#define G_SLICE_CONFIG_CHECK	0
63#define G_SLICE_CONFIG_SET	1
64#define G_SLICE_CONFIG_FORCE	2
65struct g_geom * g_slice_new(struct g_class *mp, int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start);
66
67#endif /* _GEOM_GEOM_SLICE_H_ */
68