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/gate/g_gate.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/6.1/sys/geom/gate/g_gate.h 157549 2006-04-05 22:12:29Z pjd $
   27  */
   28 
   29 #ifndef _G_GATE_H_
   30 #define _G_GATE_H_
   31 
   32 #include <sys/param.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/queue.h>
   36 
   37 #include <geom/geom.h>
   38 
   39 #define G_GATE_CLASS_NAME       "GATE"
   40 #define G_GATE_PROVIDER_NAME    "ggate"
   41 #define G_GATE_MOD_NAME         "ggate"
   42 #define G_GATE_CTL_NAME         "ggctl"
   43 
   44 #define G_GATE_VERSION          1
   45 
   46 /*
   47  * Maximum number of request that can be stored in
   48  * the queue when there are no workers.
   49  */
   50 #define G_GATE_MAX_QUEUE_SIZE   4096
   51 
   52 #define G_GATE_FLAG_READONLY    0x0001
   53 #define G_GATE_FLAG_WRITEONLY   0x0002
   54 #define G_GATE_FLAG_DESTROY     0x1000
   55 #define G_GATE_USERFLAGS        (G_GATE_FLAG_READONLY | G_GATE_FLAG_WRITEONLY)
   56 
   57 #define G_GATE_CMD_CREATE       _IOWR('m', 0, struct g_gate_ctl_create)
   58 #define G_GATE_CMD_DESTROY      _IOWR('m', 1, struct g_gate_ctl_destroy)
   59 #define G_GATE_CMD_CANCEL       _IOWR('m', 2, struct g_gate_ctl_cancel)
   60 #define G_GATE_CMD_START        _IOWR('m', 3, struct g_gate_ctl_io)
   61 #define G_GATE_CMD_DONE         _IOWR('m', 4, struct g_gate_ctl_io)
   62 
   63 #define G_GATE_INFOSIZE         2048
   64 
   65 #ifdef _KERNEL
   66 /*
   67  * 'P:' means 'Protected by'.
   68  */
   69 struct g_gate_softc {
   70         int                      sc_unit;               /* P: (read-only) */
   71         int16_t                  sc_ref;                /* P: g_gate_list_mtx */
   72         struct g_provider       *sc_provider;           /* P: (read-only) */
   73         uint32_t                 sc_flags;              /* P: (read-only) */
   74 
   75         struct bio_queue_head    sc_inqueue;            /* P: sc_queue_mtx */
   76         struct bio_queue_head    sc_outqueue;           /* P: sc_queue_mtx */
   77         struct mtx               sc_queue_mtx;
   78         uint32_t                 sc_queue_count;        /* P: sc_queue_mtx */
   79         uint32_t                 sc_queue_size;         /* P: (read-only) */
   80         u_int                    sc_timeout;            /* P: (read-only) */
   81         struct callout           sc_callout;            /* P: (modified only
   82                                                                from callout
   83                                                                thread) */
   84         uintptr_t                sc_seq;                /* P: (modified only
   85                                                                from g_down
   86                                                                thread) */
   87         LIST_ENTRY(g_gate_softc) sc_next;               /* P: g_gate_list_mtx */
   88         char                     sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */
   89 };
   90 #define sc_name sc_provider->geom->name
   91 
   92 #define G_GATE_DEBUG(lvl, ...)  do {                                    \
   93         if (g_gate_debug >= (lvl)) {                                    \
   94                 printf("GEOM_GATE");                                    \
   95                 if (g_gate_debug > 0)                                   \
   96                         printf("[%u]", lvl);                            \
   97                 printf(": ");                                           \
   98                 printf(__VA_ARGS__);                                    \
   99                 printf("\n");                                           \
  100         }                                                               \
  101 } while (0)
  102 #define G_GATE_LOGREQ(lvl, bp, ...)     do {                            \
  103         if (g_gate_debug >= (lvl)) {                                    \
  104                 printf("GEOM_GATE");                                    \
  105                 if (g_gate_debug > 0)                                   \
  106                         printf("[%u]", lvl);                            \
  107                 printf(": ");                                           \
  108                 printf(__VA_ARGS__);                                    \
  109                 printf(" ");                                            \
  110                 g_print_bio(bp);                                        \
  111                 printf("\n");                                           \
  112         }                                                               \
  113 } while (0)
  114 #endif  /* !_KERNEL */
  115 
  116 struct g_gate_ctl_create {
  117         u_int   gctl_version;
  118         off_t   gctl_mediasize;
  119         u_int   gctl_sectorsize;
  120         u_int   gctl_flags;
  121         u_int   gctl_maxcount;
  122         u_int   gctl_timeout;
  123         char    gctl_info[G_GATE_INFOSIZE];
  124         int     gctl_unit;      /* out */
  125 };
  126 
  127 struct g_gate_ctl_destroy {
  128         u_int   gctl_version;
  129         int     gctl_unit;
  130         int     gctl_force;
  131 };
  132 
  133 struct g_gate_ctl_cancel {
  134         u_int           gctl_version;
  135         int             gctl_unit;
  136         uintptr_t       gctl_seq;
  137 };
  138 
  139 struct g_gate_ctl_io {
  140         u_int            gctl_version;
  141         int              gctl_unit;
  142         uintptr_t        gctl_seq;
  143         u_int            gctl_cmd;
  144         off_t            gctl_offset;
  145         off_t            gctl_length;
  146         void            *gctl_data;
  147         int              gctl_error;
  148 };
  149 #endif  /* !_G_GATE_H_ */

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