blob: 483cecfbd7615313f7d2077b5856b1484a382e63 [file] [log] [blame]
#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 bsd_acct_struct;
struct pid_namespace {
struct kref kref;
struct pidmap pidmap[PIDMAP_ENTRIES];
int last_pid;
int dead;
struct task_struct *child_reaper;
struct kmem_cache *pid_cachep;
unsigned int level;
unsigned int proc_inum;
struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
struct vfsmount *proc_mnt;
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
struct bsd_acct_struct *bacct;
#endif
};
extern struct pid_namespace init_pid_ns;
#ifdef CONFIG_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 *default_ns, struct pid_namespace *active_ns);
extern void free_pid_ns(struct kref *kref);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
static inline void put_pid_ns(struct pid_namespace *ns)
{
if (ns != &init_pid_ns)
kref_put(&ns->kref, free_pid_ns);
}
static inline bool pid_ns_dead(struct pid *pid)
{
int i;
for (i = 0; i <= pid->level; i++) {
if (pid->numbers[i].ns->dead)
return true;
}
return false;
}
#else /* !CONFIG_PID_NS */
#include <linux/err.h>
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
return ns;
}
static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
struct pid_namespace *default_ns, struct pid_namespace *active_ns)
{
if (flags & CLONE_NEWPID)
return ERR_PTR(-EINVAL);
return default_ns;
}
static inline void put_pid_ns(struct pid_namespace *ns)
{
}
static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
BUG();
}
static inline bool pid_ns_dead(struct pid *pid)
{
return false;
}
#endif /* CONFIG_PID_NS */
extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
void pidmap_init(void);
#endif /* _LINUX_PID_NS_H */