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 struct pid_namespace {
24 unsigned int pid_allocated;
25 struct task_struct *child_reaper;
26 struct kmem_cache *pid_cachep;
28 struct pid_namespace *parent;
29 #ifdef CONFIG_BSD_PROCESS_ACCT
32 struct user_namespace *user_ns;
33 struct ucounts *ucounts;
34 int reboot; /* group exit code if this pidns was rebooted */
38 extern struct pid_namespace init_pid_ns;
40 #define PIDNS_ADDING (1U << 31)
43 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
45 if (ns != &init_pid_ns)
50 extern struct pid_namespace *copy_pid_ns(unsigned long flags,
51 struct user_namespace *user_ns, struct pid_namespace *ns);
52 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
53 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
54 extern void put_pid_ns(struct pid_namespace *ns);
56 #else /* !CONFIG_PID_NS */
57 #include <linux/err.h>
59 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
64 static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
65 struct user_namespace *user_ns, struct pid_namespace *ns)
67 if (flags & CLONE_NEWPID)
68 ns = ERR_PTR(-EINVAL);
72 static inline void put_pid_ns(struct pid_namespace *ns)
76 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
81 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
85 #endif /* CONFIG_PID_NS */
87 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
88 void pidhash_init(void);
89 void pid_idr_init(void);
91 #endif /* _LINUX_PID_NS_H */