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Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001/*
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>
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050030#include <linux/fs.h>
31#include <linux/parser.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050032#include <net/9p/client.h>
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050033#include <net/9p/transport.h>
34#include <linux/list.h>
Tejun Heo72029fe2008-09-24 16:22:23 -050035#include <linux/spinlock.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050036
37#ifdef CONFIG_NET_9P_DEBUG
38unsigned int p9_debug_level = 0; /* feature-rific global debug level */
39EXPORT_SYMBOL(p9_debug_level);
40module_param_named(debug, p9_debug_level, uint, 0);
41MODULE_PARM_DESC(debug, "9P debugging level");
42#endif
43
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050044/*
45 * Dynamic Transport Registration Routines
46 *
47 */
48
Tejun Heo72029fe2008-09-24 16:22:23 -050049static DEFINE_SPINLOCK(v9fs_trans_lock);
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050050static LIST_HEAD(v9fs_trans_list);
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050051
52/**
53 * v9fs_register_trans - register a new transport with 9p
Eric Van Hensbergenee443992008-03-05 07:08:09 -060054 * @m: structure describing the transport module and entry points
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050055 *
56 */
57void v9fs_register_trans(struct p9_trans_module *m)
58{
Tejun Heo72029fe2008-09-24 16:22:23 -050059 spin_lock(&v9fs_trans_lock);
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050060 list_add_tail(&m->list, &v9fs_trans_list);
Tejun Heo72029fe2008-09-24 16:22:23 -050061 spin_unlock(&v9fs_trans_lock);
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050062}
63EXPORT_SYMBOL(v9fs_register_trans);
64
65/**
Tejun Heo72029fe2008-09-24 16:22:23 -050066 * v9fs_unregister_trans - unregister a 9p transport
67 * @m: the transport to remove
68 *
69 */
70void v9fs_unregister_trans(struct p9_trans_module *m)
71{
72 spin_lock(&v9fs_trans_lock);
73 list_del_init(&m->list);
74 spin_unlock(&v9fs_trans_lock);
75}
76EXPORT_SYMBOL(v9fs_unregister_trans);
77
78/**
79 * v9fs_get_trans_by_name - get transport with the matching name
Eric Van Hensbergenee443992008-03-05 07:08:09 -060080 * @name: string identifying transport
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050081 *
82 */
Tejun Heo72029fe2008-09-24 16:22:23 -050083struct p9_trans_module *v9fs_get_trans_by_name(const substring_t *name)
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050084{
Tejun Heo72029fe2008-09-24 16:22:23 -050085 struct p9_trans_module *t, *found = NULL;
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050086
Tejun Heo72029fe2008-09-24 16:22:23 -050087 spin_lock(&v9fs_trans_lock);
88
89 list_for_each_entry(t, &v9fs_trans_list, list)
90 if (strncmp(t->name, name->from, name->to-name->from) == 0 &&
91 try_module_get(t->owner)) {
92 found = t;
93 break;
94 }
95
96 spin_unlock(&v9fs_trans_lock);
97 return found;
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050098}
Tejun Heo72029fe2008-09-24 16:22:23 -050099EXPORT_SYMBOL(v9fs_get_trans_by_name);
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -0500100
101/**
Tejun Heo72029fe2008-09-24 16:22:23 -0500102 * v9fs_get_default_trans - get the default transport
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -0500103 *
104 */
105
Tejun Heo72029fe2008-09-24 16:22:23 -0500106struct p9_trans_module *v9fs_get_default_trans(void)
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -0500107{
Tejun Heo72029fe2008-09-24 16:22:23 -0500108 struct p9_trans_module *t, *found = NULL;
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -0500109
Tejun Heo72029fe2008-09-24 16:22:23 -0500110 spin_lock(&v9fs_trans_lock);
111
112 list_for_each_entry(t, &v9fs_trans_list, list)
113 if (t->def && try_module_get(t->owner)) {
114 found = t;
115 break;
116 }
117
118 if (!found)
119 list_for_each_entry(t, &v9fs_trans_list, list)
120 if (try_module_get(t->owner)) {
121 found = t;
122 break;
123 }
124
125 spin_unlock(&v9fs_trans_lock);
126 return found;
127}
128EXPORT_SYMBOL(v9fs_get_default_trans);
129
130/**
131 * v9fs_put_trans - put trans
132 * @m: transport to put
133 *
134 */
135void v9fs_put_trans(struct p9_trans_module *m)
136{
137 if (m)
138 module_put(m->owner);
139}
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -0500140
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500141/**
Rob Landley961a5a52011-04-30 12:56:24 -0500142 * init_p9 - Initialize module
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500143 *
144 */
145static int __init init_p9(void)
146{
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600147 int ret = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500148
149 p9_error_init();
150 printk(KERN_INFO "Installing 9P2000 support\n");
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500151 p9_trans_fd_init();
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500152
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500153 return ret;
154}
155
156/**
Rob Landley961a5a52011-04-30 12:56:24 -0500157 * exit_p9 - shutdown module
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500158 *
159 */
160
161static void __exit exit_p9(void)
162{
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600163 printk(KERN_INFO "Unloading 9P2000 support\n");
Tejun Heo72029fe2008-09-24 16:22:23 -0500164
165 p9_trans_fd_exit();
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500166}
167
168module_init(init_p9)
169module_exit(exit_p9)
170
171MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
172MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
173MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
174MODULE_LICENSE("GPL");