Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / 9p / mod.c

diff --git a/kernel/net/9p/mod.c b/kernel/net/9p/mod.c
new file mode 100644 (file)
index 0000000..6ab36ae
--- /dev/null
+++ b/kernel/net/9p/mod.c
@@ -0,0 +1,201 @@
+/*
+ *  net/9p/9p.c
+ *
+ *  9P entry point
+ *
+ *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/moduleparam.h>
+#include <net/9p/9p.h>
+#include <linux/fs.h>
+#include <linux/parser.h>
+#include <net/9p/client.h>
+#include <net/9p/transport.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+#ifdef CONFIG_NET_9P_DEBUG
+unsigned int p9_debug_level = 0;       /* feature-rific global debug level  */
+EXPORT_SYMBOL(p9_debug_level);
+module_param_named(debug, p9_debug_level, uint, 0);
+MODULE_PARM_DESC(debug, "9P debugging level");
+
+void _p9_debug(enum p9_debug_flags level, const char *func,
+               const char *fmt, ...)
+{
+       struct va_format vaf;
+       va_list args;
+
+       if ((p9_debug_level & level) != level)
+               return;
+
+       va_start(args, fmt);
+
+       vaf.fmt = fmt;
+       vaf.va = &args;
+
+       if (level == P9_DEBUG_9P)
+               pr_notice("(%8.8d) %pV", task_pid_nr(current), &vaf);
+       else
+               pr_notice("-- %s (%d): %pV", func, task_pid_nr(current), &vaf);
+
+       va_end(args);
+}
+EXPORT_SYMBOL(_p9_debug);
+#endif
+
+/*
+ * Dynamic Transport Registration Routines
+ *
+ */
+
+static DEFINE_SPINLOCK(v9fs_trans_lock);
+static LIST_HEAD(v9fs_trans_list);
+
+/**
+ * v9fs_register_trans - register a new transport with 9p
+ * @m: structure describing the transport module and entry points
+ *
+ */
+void v9fs_register_trans(struct p9_trans_module *m)
+{
+       spin_lock(&v9fs_trans_lock);
+       list_add_tail(&m->list, &v9fs_trans_list);
+       spin_unlock(&v9fs_trans_lock);
+}
+EXPORT_SYMBOL(v9fs_register_trans);
+
+/**
+ * v9fs_unregister_trans - unregister a 9p transport
+ * @m: the transport to remove
+ *
+ */
+void v9fs_unregister_trans(struct p9_trans_module *m)
+{
+       spin_lock(&v9fs_trans_lock);
+       list_del_init(&m->list);
+       spin_unlock(&v9fs_trans_lock);
+}
+EXPORT_SYMBOL(v9fs_unregister_trans);
+
+/**
+ * v9fs_get_trans_by_name - get transport with the matching name
+ * @name: string identifying transport
+ *
+ */
+struct p9_trans_module *v9fs_get_trans_by_name(char *s)
+{
+       struct p9_trans_module *t, *found = NULL;
+
+       spin_lock(&v9fs_trans_lock);
+
+       list_for_each_entry(t, &v9fs_trans_list, list)
+               if (strcmp(t->name, s) == 0 &&
+                   try_module_get(t->owner)) {
+                       found = t;
+                       break;
+               }
+
+       spin_unlock(&v9fs_trans_lock);
+       return found;
+}
+EXPORT_SYMBOL(v9fs_get_trans_by_name);
+
+/**
+ * v9fs_get_default_trans - get the default transport
+ *
+ */
+
+struct p9_trans_module *v9fs_get_default_trans(void)
+{
+       struct p9_trans_module *t, *found = NULL;
+
+       spin_lock(&v9fs_trans_lock);
+
+       list_for_each_entry(t, &v9fs_trans_list, list)
+               if (t->def && try_module_get(t->owner)) {
+                       found = t;
+                       break;
+               }
+
+       if (!found)
+               list_for_each_entry(t, &v9fs_trans_list, list)
+                       if (try_module_get(t->owner)) {
+                               found = t;
+                               break;
+                       }
+
+       spin_unlock(&v9fs_trans_lock);
+       return found;
+}
+EXPORT_SYMBOL(v9fs_get_default_trans);
+
+/**
+ * v9fs_put_trans - put trans
+ * @m: transport to put
+ *
+ */
+void v9fs_put_trans(struct p9_trans_module *m)
+{
+       if (m)
+               module_put(m->owner);
+}
+
+/**
+ * init_p9 - Initialize module
+ *
+ */
+static int __init init_p9(void)
+{
+       int ret = 0;
+
+       p9_error_init();
+       pr_info("Installing 9P2000 support\n");
+       p9_trans_fd_init();
+
+       return ret;
+}
+
+/**
+ * exit_p9 - shutdown module
+ *
+ */
+
+static void __exit exit_p9(void)
+{
+       pr_info("Unloading 9P2000 support\n");
+
+       p9_trans_fd_exit();
+}
+
+module_init(init_p9)
+module_exit(exit_p9)
+
+MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
+MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
+MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
+MODULE_LICENSE("GPL");