g_stripe.h

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    1 /*-
    2  * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@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: releng/8.1/sys/geom/stripe/g_stripe.h 155174 2006-02-01 12:06:01Z pjd $
   27  */
   28 
   29 #ifndef _G_STRIPE_H_
   30 #define _G_STRIPE_H_
   31 
   32 #include <sys/endian.h>
   33 
   34 #define G_STRIPE_CLASS_NAME     "STRIPE"
   35 
   36 #define G_STRIPE_MAGIC          "GEOM::STRIPE"
   37 /*
   38  * Version history:
   39  * 0 - Initial version number.
   40  * 1 - Added 'stop' command for gstripe(8).
   41  * 2 - Added md_provider field to metadata and '-h' option for gstripe(8).
   42  * 3 - Added md_provsize field to metadata.
   43  */
   44 #define G_STRIPE_VERSION        3
   45 
   46 #ifdef _KERNEL
   47 #define G_STRIPE_TYPE_MANUAL    0
   48 #define G_STRIPE_TYPE_AUTOMATIC 1
   49 
   50 #define G_STRIPE_DEBUG(lvl, ...)        do {                            \
   51         if (g_stripe_debug >= (lvl)) {                                  \
   52                 printf("GEOM_STRIPE");                                  \
   53                 if (g_stripe_debug > 0)                                 \
   54                         printf("[%u]", lvl);                            \
   55                 printf(": ");                                           \
   56                 printf(__VA_ARGS__);                                    \
   57                 printf("\n");                                           \
   58         }                                                               \
   59 } while (0)
   60 #define G_STRIPE_LOGREQ(bp, ...)        do {                            \
   61         if (g_stripe_debug >= 2) {                                      \
   62                 printf("GEOM_STRIPE[2]: ");                             \
   63                 printf(__VA_ARGS__);                                    \
   64                 printf(" ");                                            \
   65                 g_print_bio(bp);                                        \
   66                 printf("\n");                                           \
   67         }                                                               \
   68 } while (0)
   69 
   70 struct g_stripe_softc {
   71         u_int            sc_type;       /* provider type */
   72         struct g_geom   *sc_geom;
   73         struct g_provider *sc_provider;
   74         uint32_t         sc_id;         /* stripe unique ID */
   75         struct g_consumer **sc_disks;
   76         uint16_t         sc_ndisks;
   77         uint32_t         sc_stripesize;
   78         uint32_t         sc_stripebits;
   79 };
   80 #define sc_name sc_geom->name
   81 #endif  /* _KERNEL */
   82 
   83 struct g_stripe_metadata {
   84         char            md_magic[16];   /* Magic value. */
   85         uint32_t        md_version;     /* Version number. */
   86         char            md_name[16];    /* Stripe name. */
   87         uint32_t        md_id;          /* Unique ID. */
   88         uint16_t        md_no;          /* Disk number. */
   89         uint16_t        md_all;         /* Number of all disks. */
   90         uint32_t        md_stripesize;  /* Stripe size. */
   91         char            md_provider[16]; /* Hardcoded provider. */
   92         uint64_t        md_provsize;    /* Provider's size. */
   93 };
   94 static __inline void
   95 stripe_metadata_encode(const struct g_stripe_metadata *md, u_char *data)
   96 {
   97 
   98         bcopy(md->md_magic, data, sizeof(md->md_magic));
   99         le32enc(data + 16, md->md_version);
  100         bcopy(md->md_name, data + 20, sizeof(md->md_name));
  101         le32enc(data + 36, md->md_id);
  102         le16enc(data + 40, md->md_no);
  103         le16enc(data + 42, md->md_all);
  104         le32enc(data + 44, md->md_stripesize);
  105         bcopy(md->md_provider, data + 48, sizeof(md->md_provider));
  106         le64enc(data + 64, md->md_provsize);
  107 }
  108 static __inline void
  109 stripe_metadata_decode(const u_char *data, struct g_stripe_metadata *md)
  110 {
  111 
  112         bcopy(data, md->md_magic, sizeof(md->md_magic));
  113         md->md_version = le32dec(data + 16);
  114         bcopy(data + 20, md->md_name, sizeof(md->md_name));
  115         md->md_id = le32dec(data + 36);
  116         md->md_no = le16dec(data + 40);
  117         md->md_all = le16dec(data + 42);
  118         md->md_stripesize = le32dec(data + 44);
  119         bcopy(data + 48, md->md_provider, sizeof(md->md_provider));
  120         md->md_provsize = le64dec(data + 64);
  121 }
  122 
  123 #endif  /* _G_STRIPE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/geom/stripe/g_stripe.h

FreeBSD/Linux Kernel Cross Reference
sys/geom/stripe/g_stripe.h