1 /*- 2 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 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 45 struct 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 59 struct 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 69 static __inline void 70 multipath_metadata_encode(const struct g_multipath_metadata *, u_char *); 71 72 static __inline void 73 multipath_metadata_decode(u_char *, struct g_multipath_metadata *); 74 75 static __inline void 76 multipath_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 93 static __inline void 94 multipath_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_ */ 111