2 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.
34 #ifndef _G_MULTIPATH_H_
35 #define _G_MULTIPATH_H_
37 #define G_MULTIPATH_CLASS_NAME "MULTIPATH"
38 #define G_MULTIPATH_VERSION 1
39 #define G_MULTIPATH_MAGIC "GEOM::MULTIPATH"
41 #include <sys/endian.h>
45 struct g_multipath_softc {
46 struct g_provider * pp;
47 struct g_consumer * cp_active;
53 struct g_multipath_metadata {
54 char md_magic[16]; /* Magic Value */
55 char md_uuid[40]; /* more magic */
56 char md_name[16]; /* a friendly name */
57 uint32_t md_version; /* version */
58 uint32_t md_sectorsize; /* sectorsize of provider */
59 uint64_t md_size; /* absolute size of provider */
63 multipath_metadata_encode(const struct g_multipath_metadata *, u_char *);
66 multipath_metadata_decode(u_char *, struct g_multipath_metadata *);
69 multipath_metadata_encode(const struct g_multipath_metadata *md, u_char *data)
71 bcopy(md->md_magic, data, sizeof(md->md_magic));
72 data += sizeof(md->md_magic);
73 bcopy(md->md_uuid, data, sizeof(md->md_uuid));
74 data += sizeof(md->md_uuid);
75 bcopy(md->md_name, data, sizeof(md->md_name));
76 data += sizeof(md->md_name);
77 le32enc(data, md->md_version);
78 data += sizeof(md->md_version);
79 le32enc(data, md->md_sectorsize);
80 data += sizeof(md->md_sectorsize);
81 le64enc(data, md->md_size);
85 multipath_metadata_decode(u_char *data, struct g_multipath_metadata *md)
87 bcopy(data, md->md_magic, sizeof(md->md_magic));
88 data += sizeof(md->md_magic);
89 bcopy(data, md->md_uuid, sizeof(md->md_uuid));
90 data += sizeof(md->md_uuid);
91 bcopy(data, md->md_name, sizeof(md->md_name));
92 data += sizeof(md->md_name);
93 md->md_version = le32dec(data);
94 data += sizeof(md->md_version);
95 md->md_sectorsize = le32dec(data);
96 data += sizeof(md->md_sectorsize);
97 md->md_size = le64dec(data);
99 #endif /* _G_MULTIPATH_H_ */