g_multipath.h

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    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_ */

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FreeBSD/Linux Kernel Cross Reference sys/geom/multipath/g_multipath.h

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sys/geom/multipath/g_multipath.h