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/*
* Copyright (C) 2013-2015 Kay Sievers
* Copyright (C) 2013-2015 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Copyright (C) 2013-2015 Daniel Mack <daniel@zonque.org>
* Copyright (C) 2013-2015 David Herrmann <dh.herrmann@gmail.com>
* Copyright (C) 2013-2015 Linux Foundation
* Copyright (C) 2014-2015 Djalal Harouni <tixxdz@opendz.org>
*
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*/
#ifndef __KDBUS_DOMAIN_H
#define __KDBUS_DOMAIN_H
#include <linux/fs.h>
#include <linux/idr.h>
#include <linux/kref.h>
#include <linux/user_namespace.h>
#include "node.h"
/**
* struct kdbus_domain - domain for buses
* @node: Underlying API node
* @lock: Domain data lock
* @last_id: Last used object id
* @user_idr: Set of all users indexed by UID
* @user_ida: Set of all users to compute small indices
* @user_namespace: User namespace, pinned at creation time
* @dentry: Root dentry of VFS mount (don't use outside of kdbusfs)
*/
struct kdbus_domain {
struct kdbus_node node;
struct mutex lock;
atomic64_t last_id;
struct idr user_idr;
struct ida user_ida;
struct user_namespace *user_namespace;
struct dentry *dentry;
};
/**
* struct kdbus_user - resource accounting for users
* @kref: Reference counter
* @domain: Domain of the user
* @id: Index of this user
* @uid: UID of the user
* @buses: Number of buses the user has created
* @connections: Number of connections the user has created
*/
struct kdbus_user {
struct kref kref;
struct kdbus_domain *domain;
unsigned int id;
kuid_t uid;
atomic_t buses;
atomic_t connections;
};
#define kdbus_domain_from_node(_node) \
container_of((_node), struct kdbus_domain, node)
struct kdbus_domain *kdbus_domain_new(unsigned int access);
struct kdbus_domain *kdbus_domain_ref(struct kdbus_domain *domain);
struct kdbus_domain *kdbus_domain_unref(struct kdbus_domain *domain);
int kdbus_domain_populate(struct kdbus_domain *domain, unsigned int access);
#define KDBUS_USER_KERNEL_ID 0 /* ID 0 is reserved for kernel accounting */
struct kdbus_user *kdbus_user_lookup(struct kdbus_domain *domain, kuid_t uid);
struct kdbus_user *kdbus_user_ref(struct kdbus_user *u);
struct kdbus_user *kdbus_user_unref(struct kdbus_user *u);
#endif
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