2 * Copyright (C) 2013-2015 Kay Sievers
3 * Copyright (C) 2013-2015 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 * Copyright (C) 2013-2015 Daniel Mack <daniel@zonque.org>
5 * Copyright (C) 2013-2015 David Herrmann <dh.herrmann@gmail.com>
6 * Copyright (C) 2013-2015 Linux Foundation
7 * Copyright (C) 2014-2015 Djalal Harouni <tixxdz@opendz.org>
9 * kdbus is free software; you can redistribute it and/or modify it under
10 * the terms of the GNU Lesser General Public License as published by the
11 * Free Software Foundation; either version 2.1 of the License, or (at
12 * your option) any later version.
15 #ifndef __KDBUS_NAMES_H
16 #define __KDBUS_NAMES_H
18 #include <linux/hashtable.h>
19 #include <linux/rwsem.h>
21 struct kdbus_name_entry;
22 struct kdbus_name_owner;
23 struct kdbus_name_registry;
26 * struct kdbus_name_registry - names registered for a bus
27 * @entries_hash: Map of entries
28 * @lock: Registry data lock
29 * @name_seq_last: Last used sequence number to assign to a name entry
31 struct kdbus_name_registry {
32 DECLARE_HASHTABLE(entries_hash, 8);
33 struct rw_semaphore rwlock;
38 * struct kdbus_name_entry - well-know name entry
39 * @name_id: sequence number of name entry to be able to uniquely
40 * identify a name over its registration lifetime
41 * @activator: activator of this name, or NULL
42 * @queue: list of queued owners
43 * @hentry: entry in registry map
44 * @name: well-known name
46 struct kdbus_name_entry {
48 struct kdbus_name_owner *activator;
49 struct list_head queue;
50 struct hlist_node hentry;
55 * struct kdbus_name_owner - owner of a well-known name
56 * @flags: KDBUS_NAME_* flags of this owner
57 * @conn: connection owning the name
58 * @name: name that is owned
59 * @conn_entry: link into @conn
60 * @name_entry: link into @name
62 struct kdbus_name_owner {
64 struct kdbus_conn *conn;
65 struct kdbus_name_entry *name;
66 struct list_head conn_entry;
67 struct list_head name_entry;
70 bool kdbus_name_is_valid(const char *p, bool allow_wildcard);
72 struct kdbus_name_registry *kdbus_name_registry_new(void);
73 void kdbus_name_registry_free(struct kdbus_name_registry *reg);
75 struct kdbus_name_entry *
76 kdbus_name_lookup_unlocked(struct kdbus_name_registry *reg, const char *name);
78 int kdbus_name_acquire(struct kdbus_name_registry *reg,
79 struct kdbus_conn *conn, const char *name,
80 u64 flags, u64 *return_flags);
81 void kdbus_name_release_all(struct kdbus_name_registry *reg,
82 struct kdbus_conn *conn);
84 int kdbus_cmd_name_acquire(struct kdbus_conn *conn, void __user *argp);
85 int kdbus_cmd_name_release(struct kdbus_conn *conn, void __user *argp);
86 int kdbus_cmd_list(struct kdbus_conn *conn, void __user *argp);
89 * kdbus_name_get_owner() - get current owner of a name
90 * @name: name to get current owner of
92 * This returns a pointer to the current owner of a name (or its activator if
93 * there is no owner). The caller must make sure @name is valid and does not
96 * Return: Pointer to current owner or NULL if there is none.
98 static inline struct kdbus_name_owner *
99 kdbus_name_get_owner(struct kdbus_name_entry *name)
101 return list_first_entry_or_null(&name->queue, struct kdbus_name_owner,
102 name_entry) ? : name->activator;