The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/virstor/g_virstor.h

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    1 /*-
    2  * Copyright (c) 2006-2007 Ivan Voras <ivoras@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/10.3/sys/geom/virstor/g_virstor.h 172302 2007-09-23 07:34:23Z pjd $
   27  */
   28 
   29 #ifndef _G_VIRSTOR_H_
   30 #define _G_VIRSTOR_H_
   31 
   32 #define G_VIRSTOR_CLASS_NAME "VIRSTOR"
   33 
   34 
   35 #define VIRSTOR_MAP_ALLOCATED 1
   36 struct virstor_map_entry {
   37         uint16_t        flags;
   38         uint16_t        provider_no;
   39         uint32_t        provider_chunk;
   40 };
   41 
   42 #define VIRSTOR_MAP_ENTRY_SIZE (sizeof(struct virstor_map_entry))
   43 #define VIRSTOR_MAP_BLOCK_ENTRIES (MAXPHYS / VIRSTOR_MAP_ENTRY_SIZE)
   44 /* Struct size is guarded by CTASSERT in main source */
   45 
   46 #ifdef _KERNEL
   47 
   48 #define LOG_MSG(lvl, ...)       do {                                    \
   49         if (g_virstor_debug >= (lvl)) {                                 \
   50                 printf("GEOM_" G_VIRSTOR_CLASS_NAME);                   \
   51                 if (lvl > 0)                                            \
   52                         printf("[%u]", lvl);                            \
   53                 printf(": ");                                           \
   54                 printf(__VA_ARGS__);                                    \
   55                 printf("\n");                                           \
   56         }                                                               \
   57 } while (0)
   58 #define LOG_MESSAGE LOG_MSG
   59 
   60 #define LOG_REQ(lvl, bp, ...)  do {                                     \
   61         if (g_virstor_debug >= (lvl)) {                                 \
   62                 printf("GEOM_" G_VIRSTOR_CLASS_NAME);                   \
   63                 if (lvl > 0)                                            \
   64                         printf("[%u]", lvl);                            \
   65                 printf(": ");                                           \
   66                 printf(__VA_ARGS__);                                    \
   67                 printf(" ");                                            \
   68                 g_print_bio(bp);                                        \
   69                 printf("\n");                                           \
   70         }                                                               \
   71 } while (0)
   72 #define LOG_REQUEST LOG_REQ
   73 
   74 /* "critical" system announcements (e.g. "geom is up") */
   75 #define LVL_ANNOUNCE    0
   76 /* errors */
   77 #define LVL_ERROR       1
   78 /* warnings */
   79 #define LVL_WARNING     2
   80 /* info, noncritical for system operation (user doesn't have to see it */
   81 #define LVL_INFO        5
   82 /* debug info */
   83 #define LVL_DEBUG       10
   84 /* more debug info */
   85 #define LVL_DEBUG2      12
   86 /* superfluous debug info (large volumes of data) */
   87 #define LVL_MOREDEBUG   15
   88 
   89 
   90 /* Component data */
   91 struct g_virstor_component {
   92         struct g_consumer       *gcons;
   93         struct g_virstor_softc  *sc;
   94         unsigned int             index;         /* Component index in array */
   95         unsigned int             chunk_count;
   96         unsigned int             chunk_next;
   97         unsigned int             chunk_reserved;
   98         unsigned int             flags;
   99 };
  100 
  101 
  102 /* Internal geom instance data */
  103 struct g_virstor_softc {
  104         struct g_geom           *geom;
  105         struct g_provider       *provider;
  106         struct g_virstor_component *components;
  107         u_int                    n_components;
  108         u_int                    curr_component; /* Component currently used */
  109         uint32_t                 id;            /* Unique ID of this geom */
  110         off_t                    virsize;       /* Total size of virstor */
  111         off_t                    sectorsize;
  112         size_t                   chunk_size;
  113         size_t                   chunk_count;   /* governs map_size */
  114         struct virstor_map_entry *map;
  115         size_t                   map_size;      /* (in bytes) */
  116         size_t                   map_sectors;   /* Size of map in sectors */
  117         size_t                   me_per_sector; /* # map entries in a sector */
  118         STAILQ_HEAD(, g_virstor_bio_q)   delayed_bio_q; /* Queue of delayed BIOs */
  119         struct mtx               delayed_bio_q_mtx;
  120 };
  121 
  122 /* "delayed BIOs" Queue element */
  123 struct g_virstor_bio_q {
  124         struct bio              *bio;
  125         STAILQ_ENTRY(g_virstor_bio_q) linkage;
  126 };
  127 
  128 
  129 #endif  /* _KERNEL */
  130 
  131 #ifndef _PATH_DEV
  132 #define _PATH_DEV "/dev/"
  133 #endif
  134 
  135 #endif  /* !_G_VIRSTOR_H_ */

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