2 * Copyright (c) 2004-2009 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/param.h>
34 #include <sys/mutex.h>
35 #include <sys/queue.h>
37 #include <geom/geom.h>
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"
44 #define G_GATE_VERSION 2
47 * Maximum number of request that can be stored in
48 * the queue when there are no workers.
50 #define G_GATE_MAX_QUEUE_SIZE 4096
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)
58 * Pick unit number automatically in /dev/ggate<unit>.
60 #define G_GATE_UNIT_AUTO (-1)
62 * Full provider name is given, so don't use ggate<unit>.
64 #define G_GATE_NAME_GIVEN (-2)
66 #define G_GATE_CMD_CREATE _IOWR('m', 0, struct g_gate_ctl_create)
67 #define G_GATE_CMD_DESTROY _IOWR('m', 1, struct g_gate_ctl_destroy)
68 #define G_GATE_CMD_CANCEL _IOWR('m', 2, struct g_gate_ctl_cancel)
69 #define G_GATE_CMD_START _IOWR('m', 3, struct g_gate_ctl_io)
70 #define G_GATE_CMD_DONE _IOWR('m', 4, struct g_gate_ctl_io)
72 #define G_GATE_INFOSIZE 2048
76 * 'P:' means 'Protected by'.
79 int sc_unit; /* P: (read-only) */
80 int sc_ref; /* P: g_gate_list_mtx */
81 struct g_provider *sc_provider; /* P: (read-only) */
82 uint32_t sc_flags; /* P: sc_queue_mtx */
84 struct bio_queue_head sc_inqueue; /* P: sc_queue_mtx */
85 struct bio_queue_head sc_outqueue; /* P: sc_queue_mtx */
86 struct mtx sc_queue_mtx;
87 uint32_t sc_queue_count; /* P: sc_queue_mtx */
88 uint32_t sc_queue_size; /* P: (read-only) */
89 u_int sc_timeout; /* P: (read-only) */
90 struct callout sc_callout; /* P: (modified only
93 uintptr_t sc_seq; /* P: (modified only
96 LIST_ENTRY(g_gate_softc) sc_next; /* P: g_gate_list_mtx */
97 char sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */
99 #define sc_name sc_provider->geom->name
101 #define G_GATE_DEBUG(lvl, ...) do { \
102 if (g_gate_debug >= (lvl)) { \
103 printf("GEOM_GATE"); \
104 if (g_gate_debug > 0) \
105 printf("[%u]", lvl); \
107 printf(__VA_ARGS__); \
111 #define G_GATE_LOGREQ(lvl, bp, ...) do { \
112 if (g_gate_debug >= (lvl)) { \
113 printf("GEOM_GATE"); \
114 if (g_gate_debug > 0) \
115 printf("[%u]", lvl); \
117 printf(__VA_ARGS__); \
123 #endif /* !_KERNEL */
125 struct g_gate_ctl_create {
127 off_t gctl_mediasize;
128 u_int gctl_sectorsize;
132 char gctl_name[NAME_MAX];
133 char gctl_info[G_GATE_INFOSIZE];
134 int gctl_unit; /* in/out */
137 struct g_gate_ctl_destroy {
141 char gctl_name[NAME_MAX];
144 struct g_gate_ctl_cancel {
148 char gctl_name[NAME_MAX];
151 struct g_gate_ctl_io {
161 #endif /* !_G_GATE_H_ */