Commit | Line | Data |
---|---|---|
1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 | 2 | /* |
bd238fb4 LI |
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> | |
bd238fb4 LI |
8 | */ |
9 | ||
5d385153 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
bd238fb4 | 12 | #include <linux/module.h> |
4cd82a5b | 13 | #include <linux/kmod.h> |
5d385153 JP |
14 | #include <linux/errno.h> |
15 | #include <linux/sched.h> | |
bd238fb4 LI |
16 | #include <linux/moduleparam.h> |
17 | #include <net/9p/9p.h> | |
fb0466c3 EVH |
18 | #include <linux/fs.h> |
19 | #include <linux/parser.h> | |
8b81ef58 | 20 | #include <net/9p/client.h> |
fb0466c3 EVH |
21 | #include <net/9p/transport.h> |
22 | #include <linux/list.h> | |
72029fe8 | 23 | #include <linux/spinlock.h> |
bd238fb4 LI |
24 | |
25 | #ifdef CONFIG_NET_9P_DEBUG | |
6e195b0f | 26 | unsigned int p9_debug_level; /* feature-rific global debug level */ |
bd238fb4 LI |
27 | EXPORT_SYMBOL(p9_debug_level); |
28 | module_param_named(debug, p9_debug_level, uint, 0); | |
29 | MODULE_PARM_DESC(debug, "9P debugging level"); | |
5d385153 JP |
30 | |
31 | void _p9_debug(enum p9_debug_flags level, const char *func, | |
6e195b0f | 32 | const char *fmt, ...) |
5d385153 JP |
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 | } | |
52 | EXPORT_SYMBOL(_p9_debug); | |
bd238fb4 LI |
53 | #endif |
54 | ||
6e195b0f | 55 | /* Dynamic Transport Registration Routines */ |
fb0466c3 | 56 | |
72029fe8 | 57 | static DEFINE_SPINLOCK(v9fs_trans_lock); |
fb0466c3 | 58 | static LIST_HEAD(v9fs_trans_list); |
fb0466c3 EVH |
59 | |
60 | /** | |
61 | * v9fs_register_trans - register a new transport with 9p | |
ee443996 | 62 | * @m: structure describing the transport module and entry points |
fb0466c3 EVH |
63 | * |
64 | */ | |
65 | void v9fs_register_trans(struct p9_trans_module *m) | |
66 | { | |
72029fe8 | 67 | spin_lock(&v9fs_trans_lock); |
fb0466c3 | 68 | list_add_tail(&m->list, &v9fs_trans_list); |
72029fe8 | 69 | spin_unlock(&v9fs_trans_lock); |
fb0466c3 EVH |
70 | } |
71 | EXPORT_SYMBOL(v9fs_register_trans); | |
72 | ||
73 | /** | |
72029fe8 TH |
74 | * v9fs_unregister_trans - unregister a 9p transport |
75 | * @m: the transport to remove | |
76 | * | |
77 | */ | |
78 | void 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 | } | |
84 | EXPORT_SYMBOL(v9fs_unregister_trans); | |
85 | ||
019641d1 | 86 | static struct p9_trans_module *_p9_get_trans_by_name(const char *s) |
fb0466c3 | 87 | { |
72029fe8 TH |
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) | |
4d63055f | 93 | if (strcmp(t->name, s) == 0 && |
72029fe8 TH |
94 | try_module_get(t->owner)) { |
95 | found = t; | |
96 | break; | |
97 | } | |
98 | ||
99 | spin_unlock(&v9fs_trans_lock); | |
4cd82a5b TW |
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 | */ | |
019641d1 | 109 | struct p9_trans_module *v9fs_get_trans_by_name(const char *s) |
4cd82a5b TW |
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 | ||
72029fe8 | 122 | return found; |
fb0466c3 | 123 | } |
72029fe8 | 124 | EXPORT_SYMBOL(v9fs_get_trans_by_name); |
fb0466c3 | 125 | |
019641d1 TW |
126 | static const char * const v9fs_default_transports[] = { |
127 | "virtio", "tcp", "fd", "unix", "xen", "rdma", | |
128 | }; | |
129 | ||
fb0466c3 | 130 | /** |
72029fe8 | 131 | * v9fs_get_default_trans - get the default transport |
fb0466c3 EVH |
132 | * |
133 | */ | |
134 | ||
72029fe8 | 135 | struct p9_trans_module *v9fs_get_default_trans(void) |
fb0466c3 | 136 | { |
72029fe8 | 137 | struct p9_trans_module *t, *found = NULL; |
019641d1 | 138 | int i; |
72029fe8 TH |
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); | |
019641d1 TW |
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 | ||
72029fe8 | 160 | return found; |
fb0466c3 | 161 | } |
72029fe8 | 162 | EXPORT_SYMBOL(v9fs_get_default_trans); |
fb0466c3 | 163 | |
72029fe8 TH |
164 | /** |
165 | * v9fs_put_trans - put trans | |
166 | * @m: transport to put | |
167 | * | |
168 | */ | |
169 | void v9fs_put_trans(struct p9_trans_module *m) | |
170 | { | |
171 | if (m) | |
172 | module_put(m->owner); | |
173 | } | |
fb0466c3 | 174 | |
bd238fb4 | 175 | /** |
961a5a50 | 176 | * init_p9 - Initialize module |
bd238fb4 LI |
177 | * |
178 | */ | |
179 | static int __init init_p9(void) | |
180 | { | |
996d5b4d MW |
181 | int ret; |
182 | ||
183 | ret = p9_client_init(); | |
184 | if (ret) | |
185 | return ret; | |
186 | ||
bd238fb4 | 187 | p9_error_init(); |
5d385153 | 188 | pr_info("Installing 9P2000 support\n"); |
bd238fb4 | 189 | |
996d5b4d | 190 | return ret; |
bd238fb4 LI |
191 | } |
192 | ||
193 | /** | |
961a5a50 | 194 | * exit_p9 - shutdown module |
bd238fb4 LI |
195 | * |
196 | */ | |
197 | ||
198 | static void __exit exit_p9(void) | |
199 | { | |
5d385153 | 200 | pr_info("Unloading 9P2000 support\n"); |
72029fe8 | 201 | |
996d5b4d | 202 | p9_client_exit(); |
bd238fb4 LI |
203 | } |
204 | ||
205 | module_init(init_p9) | |
206 | module_exit(exit_p9) | |
207 | ||
208 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); | |
209 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
210 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); | |
211 | MODULE_LICENSE("GPL"); | |
67c20de3 | 212 | MODULE_DESCRIPTION("Plan 9 Resource Sharing Support (9P2000)"); |