master
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/*
29 * Based upon work by Pawel Jakub Dawidek <pjd@FreeBSD.org> for all of the
30 * fine geom examples, and by Poul Henning Kamp <phk@FreeBSD.org> for GEOM
31 * itself, all of which is most gratefully acknowledged.
32 */
33
34#ifndef _G_MULTIPATH_H_
35#define _G_MULTIPATH_H_
36
37#define G_MULTIPATH_CLASS_NAME "MULTIPATH"
38#define G_MULTIPATH_VERSION 1
39#define G_MULTIPATH_MAGIC "GEOM::MULTIPATH"
40
41#include <sys/endian.h>
42
43#ifdef _KERNEL
44
45struct g_multipath_softc {
46 struct g_provider * sc_pp;
47 struct g_consumer * sc_active;
48 struct mtx sc_mtx;
49 char sc_name[16];
50 char sc_uuid[40];
51 off_t sc_size;
52 int sc_opened;
53 int sc_stopping;
54 int sc_ndisks;
55 int sc_active_active; /* Active/Active mode */
56};
57#endif /* _KERNEL */
58
59struct g_multipath_metadata {
60 char md_magic[16]; /* Magic Value */
61 char md_uuid[40]; /* more magic */
62 char md_name[16]; /* a friendly name */
63 uint32_t md_version; /* version */
64 uint32_t md_sectorsize; /* sectorsize of provider */
65 uint64_t md_size; /* absolute size of provider */
66 uint8_t md_active_active; /* Active/Active mode */
67};
68
69static __inline void
70multipath_metadata_encode(const struct g_multipath_metadata *, u_char *);
71
72static __inline void
73multipath_metadata_decode(u_char *, struct g_multipath_metadata *);
74
75static __inline void
76multipath_metadata_encode(const struct g_multipath_metadata *md, u_char *data)
77{
78 bcopy(md->md_magic, data, sizeof(md->md_magic));
79 data += sizeof(md->md_magic);
80 bcopy(md->md_uuid, data, sizeof(md->md_uuid));
81 data += sizeof(md->md_uuid);
82 bcopy(md->md_name, data, sizeof(md->md_name));
83 data += sizeof(md->md_name);
84 le32enc(data, md->md_version);
85 data += sizeof(md->md_version);
86 le32enc(data, md->md_sectorsize);
87 data += sizeof(md->md_sectorsize);
88 le64enc(data, md->md_size);
89 data += sizeof(md->md_size);
90 *data = md->md_active_active;
91}
92
93static __inline void
94multipath_metadata_decode(u_char *data, struct g_multipath_metadata *md)
95{
96 bcopy(data, md->md_magic, sizeof(md->md_magic));
97 data += sizeof(md->md_magic);
98 bcopy(data, md->md_uuid, sizeof(md->md_uuid));
99 data += sizeof(md->md_uuid);
100 bcopy(data, md->md_name, sizeof(md->md_name));
101 data += sizeof(md->md_name);
102 md->md_version = le32dec(data);
103 data += sizeof(md->md_version);
104 md->md_sectorsize = le32dec(data);
105 data += sizeof(md->md_sectorsize);
106 md->md_size = le64dec(data);
107 data += sizeof(md->md_size);
108 md->md_active_active = *data;
109}
110#endif /* _G_MULTIPATH_H_ */