1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PID_NS_H
3 #define _LINUX_PID_NS_H
5 #include <linux/sched.h>
8 #include <linux/workqueue.h>
9 #include <linux/threads.h>
10 #include <linux/nsproxy.h>
11 #include <linux/kref.h>
12 #include <linux/ns_common.h>
13 #include <linux/idr.h>
15 /* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
16 #define MAX_PID_NS_LEVEL 32
20 enum { /* definitions for pid_namespace's hide_pid field */
22 HIDEPID_NO_ACCESS = 1,
23 HIDEPID_INVISIBLE = 2,
26 struct pid_namespace {
30 unsigned int pid_allocated;
31 struct task_struct *child_reaper;
32 struct kmem_cache *pid_cachep;
34 struct pid_namespace *parent;
36 struct dentry *proc_self;
37 struct dentry *proc_thread_self;
39 #ifdef CONFIG_BSD_PROCESS_ACCT
42 struct user_namespace *user_ns;
43 struct ucounts *ucounts;
46 int reboot; /* group exit code if this pidns was rebooted */
50 extern struct pid_namespace init_pid_ns;
52 #define PIDNS_ADDING (1U << 31)
55 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
57 if (ns != &init_pid_ns)
62 extern struct pid_namespace *copy_pid_ns(unsigned long flags,
63 struct user_namespace *user_ns, struct pid_namespace *ns);
64 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
65 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
66 extern void put_pid_ns(struct pid_namespace *ns);
68 #else /* !CONFIG_PID_NS */
69 #include <linux/err.h>
71 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
76 static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
77 struct user_namespace *user_ns, struct pid_namespace *ns)
79 if (flags & CLONE_NEWPID)
80 ns = ERR_PTR(-EINVAL);
84 static inline void put_pid_ns(struct pid_namespace *ns)
88 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
93 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
97 #endif /* CONFIG_PID_NS */
99 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
100 void pidhash_init(void);
101 void pid_idr_init(void);
103 #endif /* _LINUX_PID_NS_H */