Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzi...
[pandora-kernel.git] / include / net / cls_cgroup.h
1 /*
2  * cls_cgroup.h                 Control Group Classifier
3  *
4  * Authors:     Thomas Graf <tgraf@suug.ch>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option)
9  * any later version.
10  *
11  */
12
13 #ifndef _NET_CLS_CGROUP_H
14 #define _NET_CLS_CGROUP_H
15
16 #include <linux/cgroup.h>
17 #include <linux/hardirq.h>
18 #include <linux/rcupdate.h>
19
20 #ifdef CONFIG_CGROUPS
21 struct cgroup_cls_state
22 {
23         struct cgroup_subsys_state css;
24         u32 classid;
25 };
26
27 #ifdef CONFIG_NET_CLS_CGROUP
28 static inline u32 task_cls_classid(struct task_struct *p)
29 {
30         if (in_interrupt())
31                 return 0;
32
33         return container_of(task_subsys_state(p, net_cls_subsys_id),
34                             struct cgroup_cls_state, css)->classid;
35 }
36 #else
37 extern int net_cls_subsys_id;
38
39 static inline u32 task_cls_classid(struct task_struct *p)
40 {
41         int id;
42         u32 classid;
43
44         if (in_interrupt())
45                 return 0;
46
47         rcu_read_lock();
48         id = rcu_dereference(net_cls_subsys_id);
49         if (id >= 0)
50                 classid = container_of(task_subsys_state(p, id),
51                                        struct cgroup_cls_state, css)->classid;
52         rcu_read_unlock();
53
54         return classid;
55 }
56 #endif
57 #else
58 static inline u32 task_cls_classid(struct task_struct *p)
59 {
60         return 0;
61 }
62 #endif
63 #endif  /* _NET_CLS_CGROUP_H */