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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * 9P entry point
4 *
5 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/module.h>
13#include <linux/kmod.h>
14#include <linux/errno.h>
15#include <linux/sched.h>
16#include <linux/moduleparam.h>
17#include <net/9p/9p.h>
18#include <linux/fs.h>
19#include <linux/parser.h>
20#include <net/9p/client.h>
21#include <net/9p/transport.h>
22#include <linux/list.h>
23#include <linux/spinlock.h>
24
25#ifdef CONFIG_NET_9P_DEBUG
26unsigned int p9_debug_level; /* feature-rific global debug level */
27EXPORT_SYMBOL(p9_debug_level);
28module_param_named(debug, p9_debug_level, uint, 0);
29MODULE_PARM_DESC(debug, "9P debugging level");
30
31void _p9_debug(enum p9_debug_flags level, const char *func,
32 const char *fmt, ...)
33{
34 struct va_format vaf;
35 va_list args;
36
37 if ((p9_debug_level & level) != level)
38 return;
39
40 va_start(args, fmt);
41
42 vaf.fmt = fmt;
43 vaf.va = &args;
44
45 if (level == P9_DEBUG_9P)
46 pr_notice("(%8.8d) %pV", task_pid_nr(current), &vaf);
47 else
48 pr_notice("-- %s (%d): %pV", func, task_pid_nr(current), &vaf);
49
50 va_end(args);
51}
52EXPORT_SYMBOL(_p9_debug);
53#endif
54
55/* Dynamic Transport Registration Routines */
56
57static DEFINE_SPINLOCK(v9fs_trans_lock);
58static LIST_HEAD(v9fs_trans_list);
59
60/**
61 * v9fs_register_trans - register a new transport with 9p
62 * @m: structure describing the transport module and entry points
63 *
64 */
65void v9fs_register_trans(struct p9_trans_module *m)
66{
67 spin_lock(&v9fs_trans_lock);
68 list_add_tail(&m->list, &v9fs_trans_list);
69 spin_unlock(&v9fs_trans_lock);
70}
71EXPORT_SYMBOL(v9fs_register_trans);
72
73/**
74 * v9fs_unregister_trans - unregister a 9p transport
75 * @m: the transport to remove
76 *
77 */
78void v9fs_unregister_trans(struct p9_trans_module *m)
79{
80 spin_lock(&v9fs_trans_lock);
81 list_del_init(&m->list);
82 spin_unlock(&v9fs_trans_lock);
83}
84EXPORT_SYMBOL(v9fs_unregister_trans);
85
86static struct p9_trans_module *_p9_get_trans_by_name(const char *s)
87{
88 struct p9_trans_module *t, *found = NULL;
89
90 spin_lock(&v9fs_trans_lock);
91
92 list_for_each_entry(t, &v9fs_trans_list, list)
93 if (strcmp(t->name, s) == 0 &&
94 try_module_get(t->owner)) {
95 found = t;
96 break;
97 }
98
99 spin_unlock(&v9fs_trans_lock);
100
101 return found;
102}
103
104/**
105 * v9fs_get_trans_by_name - get transport with the matching name
106 * @s: string identifying transport
107 *
108 */
109struct p9_trans_module *v9fs_get_trans_by_name(const char *s)
110{
111 struct p9_trans_module *found = NULL;
112
113 found = _p9_get_trans_by_name(s);
114
115#ifdef CONFIG_MODULES
116 if (!found) {
117 request_module("9p-%s", s);
118 found = _p9_get_trans_by_name(s);
119 }
120#endif
121
122 return found;
123}
124EXPORT_SYMBOL(v9fs_get_trans_by_name);
125
126static const char * const v9fs_default_transports[] = {
127 "virtio", "tcp", "fd", "unix", "xen", "rdma",
128};
129
130/**
131 * v9fs_get_default_trans - get the default transport
132 *
133 */
134
135struct p9_trans_module *v9fs_get_default_trans(void)
136{
137 struct p9_trans_module *t, *found = NULL;
138 int i;
139
140 spin_lock(&v9fs_trans_lock);
141
142 list_for_each_entry(t, &v9fs_trans_list, list)
143 if (t->def && try_module_get(t->owner)) {
144 found = t;
145 break;
146 }
147
148 if (!found)
149 list_for_each_entry(t, &v9fs_trans_list, list)
150 if (try_module_get(t->owner)) {
151 found = t;
152 break;
153 }
154
155 spin_unlock(&v9fs_trans_lock);
156
157 for (i = 0; !found && i < ARRAY_SIZE(v9fs_default_transports); i++)
158 found = v9fs_get_trans_by_name(v9fs_default_transports[i]);
159
160 return found;
161}
162EXPORT_SYMBOL(v9fs_get_default_trans);
163
164/**
165 * v9fs_put_trans - put trans
166 * @m: transport to put
167 *
168 */
169void v9fs_put_trans(struct p9_trans_module *m)
170{
171 if (m)
172 module_put(m->owner);
173}
174
175/**
176 * init_p9 - Initialize module
177 *
178 */
179static int __init init_p9(void)
180{
181 int ret;
182
183 ret = p9_client_init();
184 if (ret)
185 return ret;
186
187 p9_error_init();
188 pr_info("Installing 9P2000 support\n");
189
190 return ret;
191}
192
193/**
194 * exit_p9 - shutdown module
195 *
196 */
197
198static void __exit exit_p9(void)
199{
200 pr_info("Unloading 9P2000 support\n");
201
202 p9_client_exit();
203}
204
205module_init(init_p9)
206module_exit(exit_p9)
207
208MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
209MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
210MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
211MODULE_LICENSE("GPL");
212MODULE_DESCRIPTION("Plan 9 Resource Sharing Support (9P2000)");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * net/9p/9p.c
4 *
5 * 9P entry point
6 *
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
9 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/sched.h>
17#include <linux/moduleparam.h>
18#include <net/9p/9p.h>
19#include <linux/fs.h>
20#include <linux/parser.h>
21#include <net/9p/client.h>
22#include <net/9p/transport.h>
23#include <linux/list.h>
24#include <linux/spinlock.h>
25
26#ifdef CONFIG_NET_9P_DEBUG
27unsigned int p9_debug_level = 0; /* feature-rific global debug level */
28EXPORT_SYMBOL(p9_debug_level);
29module_param_named(debug, p9_debug_level, uint, 0);
30MODULE_PARM_DESC(debug, "9P debugging level");
31
32void _p9_debug(enum p9_debug_flags level, const char *func,
33 const char *fmt, ...)
34{
35 struct va_format vaf;
36 va_list args;
37
38 if ((p9_debug_level & level) != level)
39 return;
40
41 va_start(args, fmt);
42
43 vaf.fmt = fmt;
44 vaf.va = &args;
45
46 if (level == P9_DEBUG_9P)
47 pr_notice("(%8.8d) %pV", task_pid_nr(current), &vaf);
48 else
49 pr_notice("-- %s (%d): %pV", func, task_pid_nr(current), &vaf);
50
51 va_end(args);
52}
53EXPORT_SYMBOL(_p9_debug);
54#endif
55
56/*
57 * Dynamic Transport Registration Routines
58 *
59 */
60
61static DEFINE_SPINLOCK(v9fs_trans_lock);
62static LIST_HEAD(v9fs_trans_list);
63
64/**
65 * v9fs_register_trans - register a new transport with 9p
66 * @m: structure describing the transport module and entry points
67 *
68 */
69void v9fs_register_trans(struct p9_trans_module *m)
70{
71 spin_lock(&v9fs_trans_lock);
72 list_add_tail(&m->list, &v9fs_trans_list);
73 spin_unlock(&v9fs_trans_lock);
74}
75EXPORT_SYMBOL(v9fs_register_trans);
76
77/**
78 * v9fs_unregister_trans - unregister a 9p transport
79 * @m: the transport to remove
80 *
81 */
82void v9fs_unregister_trans(struct p9_trans_module *m)
83{
84 spin_lock(&v9fs_trans_lock);
85 list_del_init(&m->list);
86 spin_unlock(&v9fs_trans_lock);
87}
88EXPORT_SYMBOL(v9fs_unregister_trans);
89
90/**
91 * v9fs_get_trans_by_name - get transport with the matching name
92 * @s: string identifying transport
93 *
94 */
95struct p9_trans_module *v9fs_get_trans_by_name(char *s)
96{
97 struct p9_trans_module *t, *found = NULL;
98
99 spin_lock(&v9fs_trans_lock);
100
101 list_for_each_entry(t, &v9fs_trans_list, list)
102 if (strcmp(t->name, s) == 0 &&
103 try_module_get(t->owner)) {
104 found = t;
105 break;
106 }
107
108 spin_unlock(&v9fs_trans_lock);
109 return found;
110}
111EXPORT_SYMBOL(v9fs_get_trans_by_name);
112
113/**
114 * v9fs_get_default_trans - get the default transport
115 *
116 */
117
118struct p9_trans_module *v9fs_get_default_trans(void)
119{
120 struct p9_trans_module *t, *found = NULL;
121
122 spin_lock(&v9fs_trans_lock);
123
124 list_for_each_entry(t, &v9fs_trans_list, list)
125 if (t->def && try_module_get(t->owner)) {
126 found = t;
127 break;
128 }
129
130 if (!found)
131 list_for_each_entry(t, &v9fs_trans_list, list)
132 if (try_module_get(t->owner)) {
133 found = t;
134 break;
135 }
136
137 spin_unlock(&v9fs_trans_lock);
138 return found;
139}
140EXPORT_SYMBOL(v9fs_get_default_trans);
141
142/**
143 * v9fs_put_trans - put trans
144 * @m: transport to put
145 *
146 */
147void v9fs_put_trans(struct p9_trans_module *m)
148{
149 if (m)
150 module_put(m->owner);
151}
152
153/**
154 * init_p9 - Initialize module
155 *
156 */
157static int __init init_p9(void)
158{
159 int ret;
160
161 ret = p9_client_init();
162 if (ret)
163 return ret;
164
165 p9_error_init();
166 pr_info("Installing 9P2000 support\n");
167 p9_trans_fd_init();
168
169 return ret;
170}
171
172/**
173 * exit_p9 - shutdown module
174 *
175 */
176
177static void __exit exit_p9(void)
178{
179 pr_info("Unloading 9P2000 support\n");
180
181 p9_trans_fd_exit();
182 p9_client_exit();
183}
184
185module_init(init_p9)
186module_exit(exit_p9)
187
188MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
189MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
190MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
191MODULE_LICENSE("GPL");
192MODULE_DESCRIPTION("Plan 9 Resource Sharing Support (9P2000)");