g_virstor.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006-2007 Ivan Voras <ivoras@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 #ifndef _G_VIRSTOR_H_
   32 #define _G_VIRSTOR_H_
   33 
   34 #define G_VIRSTOR_CLASS_NAME "VIRSTOR"
   35 
   36 
   37 #define VIRSTOR_MAP_ALLOCATED 1
   38 struct virstor_map_entry {
   39         uint16_t        flags;
   40         uint16_t        provider_no;
   41         uint32_t        provider_chunk;
   42 };
   43 
   44 #define VIRSTOR_MAP_ENTRY_SIZE (sizeof(struct virstor_map_entry))
   45 #define VIRSTOR_MAP_BLOCK_ENTRIES (MAXPHYS / VIRSTOR_MAP_ENTRY_SIZE)
   46 /* Struct size is guarded by CTASSERT in main source */
   47 
   48 #ifdef _KERNEL
   49 
   50 #define LOG_MSG(lvl, ...)       do {                                    \
   51         if (g_virstor_debug >= (lvl)) {                                 \
   52                 printf("GEOM_" G_VIRSTOR_CLASS_NAME);                   \
   53                 if ((lvl) > 0)                                          \
   54                         printf("[%u]", (lvl));                          \
   55                 printf(": ");                                           \
   56                 printf(__VA_ARGS__);                                    \
   57                 printf("\n");                                           \
   58         }                                                               \
   59 } while (0)
   60 #define LOG_MESSAGE LOG_MSG
   61 
   62 #define LOG_REQ(lvl, bp, ...)  do {                                     \
   63         if (g_virstor_debug >= (lvl)) {                                 \
   64                 printf("GEOM_" G_VIRSTOR_CLASS_NAME);                   \
   65                 if ((lvl) > 0)                                          \
   66                         printf("[%u]", (lvl));                          \
   67                 printf(": ");                                           \
   68                 printf(__VA_ARGS__);                                    \
   69                 printf(" ");                                            \
   70                 g_print_bio(bp);                                        \
   71                 printf("\n");                                           \
   72         }                                                               \
   73 } while (0)
   74 #define LOG_REQUEST LOG_REQ
   75 
   76 /* "critical" system announcements (e.g. "geom is up") */
   77 #define LVL_ANNOUNCE    0
   78 /* errors */
   79 #define LVL_ERROR       1
   80 /* warnings */
   81 #define LVL_WARNING     2
   82 /* info, noncritical for system operation (user doesn't have to see it */
   83 #define LVL_INFO        5
   84 /* debug info */
   85 #define LVL_DEBUG       10
   86 /* more debug info */
   87 #define LVL_DEBUG2      12
   88 /* superfluous debug info (large volumes of data) */
   89 #define LVL_MOREDEBUG   15
   90 
   91 
   92 /* Component data */
   93 struct g_virstor_component {
   94         struct g_consumer       *gcons;
   95         struct g_virstor_softc  *sc;
   96         unsigned int             index;         /* Component index in array */
   97         unsigned int             chunk_count;
   98         unsigned int             chunk_next;
   99         unsigned int             chunk_reserved;
  100         unsigned int             flags;
  101 };
  102 
  103 
  104 /* Internal geom instance data */
  105 struct g_virstor_softc {
  106         struct g_geom           *geom;
  107         struct g_provider       *provider;
  108         struct g_virstor_component *components;
  109         u_int                    n_components;
  110         u_int                    curr_component; /* Component currently used */
  111         uint32_t                 id;            /* Unique ID of this geom */
  112         off_t                    virsize;       /* Total size of virstor */
  113         off_t                    sectorsize;
  114         size_t                   chunk_size;
  115         size_t                   chunk_count;   /* governs map_size */
  116         struct virstor_map_entry *map;
  117         size_t                   map_size;      /* (in bytes) */
  118         size_t                   map_sectors;   /* Size of map in sectors */
  119         size_t                   me_per_sector; /* # map entries in a sector */
  120         STAILQ_HEAD(, g_virstor_bio_q)   delayed_bio_q; /* Queue of delayed BIOs */
  121         struct mtx               delayed_bio_q_mtx;
  122 };
  123 
  124 /* "delayed BIOs" Queue element */
  125 struct g_virstor_bio_q {
  126         struct bio              *bio;
  127         STAILQ_ENTRY(g_virstor_bio_q) linkage;
  128 };
  129 
  130 
  131 #endif  /* _KERNEL */
  132 
  133 #ifndef _PATH_DEV
  134 #define _PATH_DEV "/dev/"
  135 #endif
  136 
  137 #endif  /* !_G_VIRSTOR_H_ */

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

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