2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 * Based upon work by Pawel Jakub Dawidek <pjd@FreeBSD.org> for all of the
32 * fine geom examples, and by Poul Henning Kamp <phk@FreeBSD.org> for GEOM
33 * itself, all of which is most gratefully acknowledged.
36 #ifndef _G_MULTIPATH_H_
37 #define _G_MULTIPATH_H_
39 #define G_MULTIPATH_CLASS_NAME "MULTIPATH"
40 #define G_MULTIPATH_VERSION 1
41 #define G_MULTIPATH_MAGIC "GEOM::MULTIPATH"
43 #include <sys/endian.h>
47 struct g_multipath_softc {
48 struct g_provider * sc_pp;
49 struct g_consumer * sc_active;
57 int sc_active_active; /* Active/Active mode */
61 struct g_multipath_metadata {
62 char md_magic[16]; /* Magic Value */
63 char md_uuid[40]; /* more magic */
64 char md_name[16]; /* a friendly name */
65 uint32_t md_version; /* version */
66 uint32_t md_sectorsize; /* sectorsize of provider */
67 uint64_t md_size; /* absolute size of provider */
68 uint8_t md_active_active; /* Active/Active mode */
72 multipath_metadata_encode(const struct g_multipath_metadata *, u_char *);
75 multipath_metadata_decode(u_char *, struct g_multipath_metadata *);
78 multipath_metadata_encode(const struct g_multipath_metadata *md, u_char *data)
80 bcopy(md->md_magic, data, sizeof(md->md_magic));
81 data += sizeof(md->md_magic);
82 bcopy(md->md_uuid, data, sizeof(md->md_uuid));
83 data += sizeof(md->md_uuid);
84 bcopy(md->md_name, data, sizeof(md->md_name));
85 data += sizeof(md->md_name);
86 le32enc(data, md->md_version);
87 data += sizeof(md->md_version);
88 le32enc(data, md->md_sectorsize);
89 data += sizeof(md->md_sectorsize);
90 le64enc(data, md->md_size);
91 data += sizeof(md->md_size);
92 *data = md->md_active_active;
96 multipath_metadata_decode(u_char *data, struct g_multipath_metadata *md)
98 bcopy(data, md->md_magic, sizeof(md->md_magic));
99 data += sizeof(md->md_magic);
100 bcopy(data, md->md_uuid, sizeof(md->md_uuid));
101 data += sizeof(md->md_uuid);
102 bcopy(data, md->md_name, sizeof(md->md_name));
103 data += sizeof(md->md_name);
104 md->md_version = le32dec(data);
105 data += sizeof(md->md_version);
106 md->md_sectorsize = le32dec(data);
107 data += sizeof(md->md_sectorsize);
108 md->md_size = le64dec(data);
109 data += sizeof(md->md_size);
110 md->md_active_active = *data;
112 #endif /* _G_MULTIPATH_H_ */