| 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 | * @name: 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 = 0; |
| 175 | |
| 176 | p9_error_init(); |
| 177 | pr_info("Installing 9P2000 support\n"); |
| 178 | p9_trans_fd_init(); |
| 179 | |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * exit_p9 - shutdown module |
| 185 | * |
| 186 | */ |
| 187 | |
| 188 | static void __exit exit_p9(void) |
| 189 | { |
| 190 | pr_info("Unloading 9P2000 support\n"); |
| 191 | |
| 192 | p9_trans_fd_exit(); |
| 193 | } |
| 194 | |
| 195 | module_init(init_p9) |
| 196 | module_exit(exit_p9) |
| 197 | |
| 198 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
| 199 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 200 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); |
| 201 | MODULE_LICENSE("GPL"); |