sys/geom/gate/g_gate.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2004-2009 Pawel Jakub Dawidek <pjd@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_GATE_H_
  32 #define _G_GATE_H_
  33
  34 #include <sys/param.h>
  35 #include <sys/lock.h>
  36 #include <sys/mutex.h>
  37 #include <sys/queue.h>
  38
  39 #include <geom/geom.h>
  40
  41 #define G_GATE_CLASS_NAME       "GATE"
  42 #define G_GATE_PROVIDER_NAME    "ggate"
  43 #define G_GATE_MOD_NAME         "ggate"
  44 #define G_GATE_CTL_NAME         "ggctl"
  45
  46 #define G_GATE_VERSION          3
  47
  48 /*
  49  * Maximum number of request that can be stored in
  50  * the queue when there are no workers.
  51  */
  52 #define G_GATE_MAX_QUEUE_SIZE   4096
  53
  54 #define G_GATE_FLAG_READONLY    0x0001
  55 #define G_GATE_FLAG_WRITEONLY   0x0002
  56 #define G_GATE_FLAG_DESTROY     0x1000
  57 #define G_GATE_USERFLAGS        (G_GATE_FLAG_READONLY | G_GATE_FLAG_WRITEONLY)
  58
  59 /*
  60  * Pick unit number automatically in /dev/ggate<unit>.
  61  */
  62 #define G_GATE_UNIT_AUTO        (-1)
  63 /*
  64  * Full provider name is given, so don't use ggate<unit>.
  65  */
  66 #define G_GATE_NAME_GIVEN       (-2)
  67
  68 #define G_GATE_CMD_CREATE       _IOWR('m', 0, struct g_gate_ctl_create)
  69 #define G_GATE_CMD_MODIFY       _IOWR('m', 1, struct g_gate_ctl_modify)
  70 #define G_GATE_CMD_DESTROY      _IOWR('m', 2, struct g_gate_ctl_destroy)
  71 #define G_GATE_CMD_CANCEL       _IOWR('m', 3, struct g_gate_ctl_cancel)
  72 #define G_GATE_CMD_START        _IOWR('m', 4, struct g_gate_ctl_io)
  73 #define G_GATE_CMD_DONE         _IOWR('m', 5, struct g_gate_ctl_io)
  74
  75 #define G_GATE_INFOSIZE         2048
  76
  77 #ifdef _KERNEL
  78 /*
  79  * 'P:' means 'Protected by'.
  80  */
  81 struct g_gate_softc {
  82         char                    *sc_name;               /* P: (read-only) */
  83         int                      sc_unit;               /* P: (read-only) */
  84         int                      sc_ref;                /* P: g_gate_list_mtx */
  85         struct g_provider       *sc_provider;           /* P: (read-only) */
  86         uint32_t                 sc_flags;              /* P: sc_queue_mtx */
  87
  88         struct bio_queue_head    sc_inqueue;            /* P: sc_queue_mtx */
  89         struct bio_queue_head    sc_outqueue;           /* P: sc_queue_mtx */
  90         struct mtx               sc_queue_mtx;
  91         uint32_t                 sc_queue_count;        /* P: sc_queue_mtx */
  92         uint32_t                 sc_queue_size;         /* P: (read-only) */
  93         u_int                    sc_timeout;            /* P: (read-only) */
  94         struct g_consumer       *sc_readcons;           /* P: XXX */
  95         off_t                    sc_readoffset;         /* P: XXX */
  96         struct callout           sc_callout;            /* P: (modified only
  97                                                                from callout
  98                                                                thread) */
  99         uintptr_t                sc_seq;                /* P: (modified only
 100                                                                from g_down
 101                                                                thread) */
 102         LIST_ENTRY(g_gate_softc) sc_next;               /* P: g_gate_list_mtx */
 103         char                     sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */
 104 };
 105
 106 #define G_GATE_DEBUG(lvl, ...) \
 107     _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), NULL, __VA_ARGS__)
 108 #define G_GATE_LOGREQ(lvl, bp, ...) \
 109     _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), (bp), __VA_ARGS__)
 110 #endif  /* !_KERNEL */
 111
 112 struct g_gate_ctl_create {
 113         u_int   gctl_version;
 114         off_t   gctl_mediasize;
 115         u_int   gctl_sectorsize;
 116         u_int   gctl_flags;
 117         u_int   gctl_maxcount;
 118         u_int   gctl_timeout;
 119         char    gctl_name[NAME_MAX];
 120         char    gctl_info[G_GATE_INFOSIZE];
 121         char    gctl_readprov[NAME_MAX];
 122         off_t   gctl_readoffset;
 123         int     gctl_unit;      /* in/out */
 124 };
 125
 126 #define GG_MODIFY_MEDIASIZE     0x01
 127 #define GG_MODIFY_INFO          0x02
 128 #define GG_MODIFY_READPROV      0x04
 129 #define GG_MODIFY_READOFFSET    0x08
 130 struct g_gate_ctl_modify {
 131         u_int           gctl_version;
 132         int             gctl_unit;
 133         uint32_t        gctl_modify;
 134         off_t           gctl_mediasize;
 135         char            gctl_info[G_GATE_INFOSIZE];
 136         char            gctl_readprov[NAME_MAX];
 137         off_t           gctl_readoffset;
 138 };
 139
 140 struct g_gate_ctl_destroy {
 141         u_int   gctl_version;
 142         int     gctl_unit;
 143         int     gctl_force;
 144         char    gctl_name[NAME_MAX];
 145 };
 146
 147 struct g_gate_ctl_cancel {
 148         u_int           gctl_version;
 149         int             gctl_unit;
 150         uintptr_t       gctl_seq;
 151         char            gctl_name[NAME_MAX];
 152 };
 153
 154 struct g_gate_ctl_io {
 155         u_int            gctl_version;
 156         int              gctl_unit;
 157         uintptr_t        gctl_seq;
 158         u_int            gctl_cmd;
 159         off_t            gctl_offset;
 160         off_t            gctl_length;
 161         void            *gctl_data;
 162         int              gctl_error;
 163 };
 164 #endif  /* !_G_GATE_H_ */