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Linux/net/9p/mod.c

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

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