net/9p/mod.c

   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
  35 #ifdef CONFIG_NET_9P_DEBUG
  36 unsigned int p9_debug_level = 0;        /* feature-rific global debug level  */
  37 EXPORT_SYMBOL(p9_debug_level);
  38 module_param_named(debug, p9_debug_level, uint, 0);
  39 MODULE_PARM_DESC(debug, "9P debugging level");
  40 #endif
  41
  42 /*
  43  * Dynamic Transport Registration Routines
  44  *
  45  */
  46
  47 static LIST_HEAD(v9fs_trans_list);
  48 static struct p9_trans_module *v9fs_default_transport;
  49
  50 /**
  51  * v9fs_register_trans - register a new transport with 9p
  52  * @m: structure describing the transport module and entry points
  53  *
  54  */
  55 void v9fs_register_trans(struct p9_trans_module *m)
  56 {
  57         list_add_tail(&m->list, &v9fs_trans_list);
  58         if (m->def)
  59                 v9fs_default_transport = m;
  60 }
  61 EXPORT_SYMBOL(v9fs_register_trans);
  62
  63 /**
  64  * v9fs_match_trans - match transport versus registered transports
  65  * @name: string identifying transport
  66  *
  67  */
  68 struct p9_trans_module *v9fs_match_trans(const substring_t *name)
  69 {
  70         struct list_head *p;
  71         struct p9_trans_module *t = NULL;
  72
  73         list_for_each(p, &v9fs_trans_list) {
  74                 t = list_entry(p, struct p9_trans_module, list);
  75                 if (strncmp(t->name, name->from, name->to-name->from) == 0)
  76                         return t;
  77         }
  78         return NULL;
  79 }
  80 EXPORT_SYMBOL(v9fs_match_trans);
  81
  82 /**
  83  * v9fs_default_trans - returns pointer to default transport
  84  *
  85  */
  86
  87 struct p9_trans_module *v9fs_default_trans(void)
  88 {
  89         if (v9fs_default_transport)
  90                 return v9fs_default_transport;
  91         else if (!list_empty(&v9fs_trans_list))
  92                 return list_first_entry(&v9fs_trans_list,
  93                                         struct p9_trans_module, list);
  94         else
  95                 return NULL;
  96 }
  97 EXPORT_SYMBOL(v9fs_default_trans);
  98
  99
 100 /**
 101  * v9fs_init - Initialize module
 102  *
 103  */
 104 static int __init init_p9(void)
 105 {
 106         int ret = 0;
 107
 108         p9_error_init();
 109         printk(KERN_INFO "Installing 9P2000 support\n");
 110         p9_trans_fd_init();
 111
 112         return ret;
 113 }
 114
 115 /**
 116  * v9fs_init - shutdown module
 117  *
 118  */
 119
 120 static void __exit exit_p9(void)
 121 {
 122         printk(KERN_INFO "Unloading 9P2000 support\n");
 123 }
 124
 125 module_init(init_p9)
 126 module_exit(exit_p9)
 127
 128 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
 129 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
 130 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
 131 MODULE_LICENSE("GPL");