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: sc_read_mtx */ 95 off_t sc_readoffset; /* P: sc_read_mtx */ 96 struct callout sc_callout; /* P: (modified only 97 from callout 98 thread) */ 99 uintptr_t sc_seq; /* P: sc_queue_mtx */ 100 LIST_ENTRY(g_gate_softc) sc_next; /* P: g_gate_list_mtx */ 101 char sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */ 102 struct mtx sc_read_mtx; 103 }; 104 105 #define G_GATE_DEBUG(lvl, ...) \ 106 _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), NULL, __VA_ARGS__) 107 #define G_GATE_LOGREQ(lvl, bp, ...) \ 108 _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), (bp), __VA_ARGS__) 109 #endif /* !_KERNEL */ 110 111 struct g_gate_ctl_create { 112 u_int gctl_version; 113 off_t gctl_mediasize; 114 u_int gctl_sectorsize; 115 u_int gctl_flags; 116 u_int gctl_maxcount; 117 u_int gctl_timeout; 118 char gctl_name[NAME_MAX]; 119 char gctl_info[G_GATE_INFOSIZE]; 120 char gctl_readprov[NAME_MAX]; 121 off_t gctl_readoffset; 122 int gctl_unit; /* in/out */ 123 }; 124 125 #define GG_MODIFY_MEDIASIZE 0x01 126 #define GG_MODIFY_INFO 0x02 127 #define GG_MODIFY_READPROV 0x04 128 #define GG_MODIFY_READOFFSET 0x08 129 struct g_gate_ctl_modify { 130 u_int gctl_version; 131 int gctl_unit; 132 uint32_t gctl_modify; 133 off_t gctl_mediasize; 134 char gctl_info[G_GATE_INFOSIZE]; 135 char gctl_readprov[NAME_MAX]; 136 off_t gctl_readoffset; 137 }; 138 139 struct g_gate_ctl_destroy { 140 u_int gctl_version; 141 int gctl_unit; 142 int gctl_force; 143 char gctl_name[NAME_MAX]; 144 }; 145 146 struct g_gate_ctl_cancel { 147 u_int gctl_version; 148 int gctl_unit; 149 uintptr_t gctl_seq; 150 char gctl_name[NAME_MAX]; 151 }; 152 153 struct g_gate_ctl_io { 154 u_int gctl_version; 155 int gctl_unit; 156 uintptr_t gctl_seq; 157 u_int gctl_cmd; 158 off_t gctl_offset; 159 off_t gctl_length; 160 void *gctl_data; 161 int gctl_error; 162 }; 163 #endif /* !_G_GATE_H_ */ 164