android_kernel_xiaomi_sm8350/include/linux/pid_namespace.h
Pavel Emelyanov b461cc0382 pid namespaces: miscellaneous preparations for pid namespaces
* remove pid.h from pid_namespaces.h;
* rework is_(cgroup|global)_init;
* optimize (get|put)_pid_ns for init_pid_ns;
* declare task_child_reaper to return actual reaper.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19 11:53:39 -07:00

60 lines
1.3 KiB
C

#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>
struct pidmap {
atomic_t nr_free;
void *page;
};
#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
struct pid_namespace {
struct kref kref;
struct pidmap pidmap[PIDMAP_ENTRIES];
int last_pid;
struct task_struct *child_reaper;
struct kmem_cache *pid_cachep;
int level;
struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
struct vfsmount *proc_mnt;
#endif
};
extern struct pid_namespace init_pid_ns;
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
if (ns != &init_pid_ns)
kref_get(&ns->kref);
return ns;
}
extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
extern void free_pid_ns(struct kref *kref);
static inline void put_pid_ns(struct pid_namespace *ns)
{
if (ns != &init_pid_ns)
kref_put(&ns->kref, free_pid_ns);
}
static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
{
return tsk->nsproxy->pid_ns;
}
static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
{
BUG_ON(tsk != current);
return tsk->nsproxy->pid_ns->child_reaper;
}
#endif /* _LINUX_PID_NS_H */