Linux kernel mirror (for testing)
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linux
1/*
2 * net/9p/9p.c
3 *
4 * 9P entry point
5 *
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <net/9p/9p.h>
30#include <linux/fs.h>
31#include <linux/parser.h>
32#include <net/9p/transport.h>
33#include <linux/list.h>
34#include <linux/spinlock.h>
35
36#ifdef CONFIG_NET_9P_DEBUG
37unsigned int p9_debug_level = 0; /* feature-rific global debug level */
38EXPORT_SYMBOL(p9_debug_level);
39module_param_named(debug, p9_debug_level, uint, 0);
40MODULE_PARM_DESC(debug, "9P debugging level");
41#endif
42
43/*
44 * Dynamic Transport Registration Routines
45 *
46 */
47
48static DEFINE_SPINLOCK(v9fs_trans_lock);
49static LIST_HEAD(v9fs_trans_list);
50
51/**
52 * v9fs_register_trans - register a new transport with 9p
53 * @m: structure describing the transport module and entry points
54 *
55 */
56void v9fs_register_trans(struct p9_trans_module *m)
57{
58 spin_lock(&v9fs_trans_lock);
59 list_add_tail(&m->list, &v9fs_trans_list);
60 spin_unlock(&v9fs_trans_lock);
61}
62EXPORT_SYMBOL(v9fs_register_trans);
63
64/**
65 * v9fs_unregister_trans - unregister a 9p transport
66 * @m: the transport to remove
67 *
68 */
69void v9fs_unregister_trans(struct p9_trans_module *m)
70{
71 spin_lock(&v9fs_trans_lock);
72 list_del_init(&m->list);
73 spin_unlock(&v9fs_trans_lock);
74}
75EXPORT_SYMBOL(v9fs_unregister_trans);
76
77/**
78 * v9fs_get_trans_by_name - get transport with the matching name
79 * @name: string identifying transport
80 *
81 */
82struct p9_trans_module *v9fs_get_trans_by_name(const substring_t *name)
83{
84 struct p9_trans_module *t, *found = NULL;
85
86 spin_lock(&v9fs_trans_lock);
87
88 list_for_each_entry(t, &v9fs_trans_list, list)
89 if (strncmp(t->name, name->from, name->to-name->from) == 0 &&
90 try_module_get(t->owner)) {
91 found = t;
92 break;
93 }
94
95 spin_unlock(&v9fs_trans_lock);
96 return found;
97}
98EXPORT_SYMBOL(v9fs_get_trans_by_name);
99
100/**
101 * v9fs_get_default_trans - get the default transport
102 *
103 */
104
105struct p9_trans_module *v9fs_get_default_trans(void)
106{
107 struct p9_trans_module *t, *found = NULL;
108
109 spin_lock(&v9fs_trans_lock);
110
111 list_for_each_entry(t, &v9fs_trans_list, list)
112 if (t->def && try_module_get(t->owner)) {
113 found = t;
114 break;
115 }
116
117 if (!found)
118 list_for_each_entry(t, &v9fs_trans_list, list)
119 if (try_module_get(t->owner)) {
120 found = t;
121 break;
122 }
123
124 spin_unlock(&v9fs_trans_lock);
125 return found;
126}
127EXPORT_SYMBOL(v9fs_get_default_trans);
128
129/**
130 * v9fs_put_trans - put trans
131 * @m: transport to put
132 *
133 */
134void v9fs_put_trans(struct p9_trans_module *m)
135{
136 if (m)
137 module_put(m->owner);
138}
139
140/**
141 * v9fs_init - Initialize module
142 *
143 */
144static int __init init_p9(void)
145{
146 int ret = 0;
147
148 p9_error_init();
149 printk(KERN_INFO "Installing 9P2000 support\n");
150 p9_trans_fd_init();
151
152 return ret;
153}
154
155/**
156 * v9fs_init - shutdown module
157 *
158 */
159
160static void __exit exit_p9(void)
161{
162 printk(KERN_INFO "Unloading 9P2000 support\n");
163
164 p9_trans_fd_exit();
165}
166
167module_init(init_p9)
168module_exit(exit_p9)
169
170MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
171MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
172MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
173MODULE_LICENSE("GPL");