forked from Minki/linux
2b73bc65e2
When the netprio_cgroup module is not loaded, net_prio_subsys_id is -1, and so sock_update_prioidx() accesses cgroup_subsys array with negative index subsys[-1]. Make the code resembles cls_cgroup code, which is bug free. Origionally-authored-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: "David S. Miller" <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/*
|
|
* netprio_cgroup.h Control Group Priority set
|
|
*
|
|
*
|
|
* Authors: Neil Horman <nhorman@tuxdriver.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#ifndef _NETPRIO_CGROUP_H
|
|
#define _NETPRIO_CGROUP_H
|
|
#include <linux/cgroup.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
|
|
struct netprio_map {
|
|
struct rcu_head rcu;
|
|
u32 priomap_len;
|
|
u32 priomap[];
|
|
};
|
|
|
|
#ifdef CONFIG_CGROUPS
|
|
|
|
struct cgroup_netprio_state {
|
|
struct cgroup_subsys_state css;
|
|
u32 prioidx;
|
|
};
|
|
|
|
#ifndef CONFIG_NETPRIO_CGROUP
|
|
extern int net_prio_subsys_id;
|
|
#endif
|
|
|
|
extern void sock_update_netprioidx(struct sock *sk);
|
|
|
|
#if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)
|
|
|
|
static inline u32 task_netprioidx(struct task_struct *p)
|
|
{
|
|
struct cgroup_netprio_state *state;
|
|
u32 idx;
|
|
|
|
rcu_read_lock();
|
|
state = container_of(task_subsys_state(p, net_prio_subsys_id),
|
|
struct cgroup_netprio_state, css);
|
|
idx = state->prioidx;
|
|
rcu_read_unlock();
|
|
return idx;
|
|
}
|
|
|
|
#elif IS_MODULE(CONFIG_NETPRIO_CGROUP)
|
|
|
|
static inline u32 task_netprioidx(struct task_struct *p)
|
|
{
|
|
struct cgroup_netprio_state *state;
|
|
int subsys_id;
|
|
u32 idx = 0;
|
|
|
|
rcu_read_lock();
|
|
subsys_id = rcu_dereference_index_check(net_prio_subsys_id,
|
|
rcu_read_lock_held());
|
|
if (subsys_id >= 0) {
|
|
state = container_of(task_subsys_state(p, subsys_id),
|
|
struct cgroup_netprio_state, css);
|
|
idx = state->prioidx;
|
|
}
|
|
rcu_read_unlock();
|
|
return idx;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline u32 task_netprioidx(struct task_struct *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_NETPRIO_CGROUP */
|
|
|
|
#else
|
|
#define sock_update_netprioidx(sk)
|
|
#endif
|
|
|
|
#endif /* _NET_CLS_CGROUP_H */
|