1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 29 */ 30 /* 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. 34 */ 35 36 #ifndef _G_MULTIPATH_H_ 37 #define _G_MULTIPATH_H_ 38 39 #define G_MULTIPATH_CLASS_NAME "MULTIPATH" 40 #define G_MULTIPATH_VERSION 1 41 #define G_MULTIPATH_MAGIC "GEOM::MULTIPATH" 42 43 #include <sys/endian.h> 44 45 #ifdef _KERNEL 46 47 struct g_multipath_softc { 48 struct g_provider * sc_pp; 49 struct g_consumer * sc_active; 50 struct mtx sc_mtx; 51 char sc_name[16]; 52 char sc_uuid[40]; 53 off_t sc_size; 54 int sc_opened; 55 int sc_stopping; 56 int sc_ndisks; 57 int sc_active_active; /* Active/Active mode */ 58 }; 59 #endif /* _KERNEL */ 60 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 */ 69 }; 70 71 static __inline void 72 multipath_metadata_encode(const struct g_multipath_metadata *, u_char *); 73 74 static __inline void 75 multipath_metadata_decode(u_char *, struct g_multipath_metadata *); 76 77 static __inline void 78 multipath_metadata_encode(const struct g_multipath_metadata *md, u_char *data) 79 { 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; 93 } 94 95 static __inline void 96 multipath_metadata_decode(u_char *data, struct g_multipath_metadata *md) 97 { 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; 111 } 112 #endif /* _G_MULTIPATH_H_ */ 113