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>
19 #define BITS_PER_PAGE (PAGE_SIZE * 8)
20 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
21 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
25 enum { /* definitions for pid_namespace's hide_pid field */
27 HIDEPID_NO_ACCESS = 1,
28 HIDEPID_INVISIBLE = 2,
31 struct pid_namespace {
33 struct pidmap pidmap[PIDMAP_ENTRIES];
36 unsigned int nr_hashed;
37 struct task_struct *child_reaper;
38 struct kmem_cache *pid_cachep;
40 struct pid_namespace *parent;
42 struct vfsmount *proc_mnt;
43 struct dentry *proc_self;
44 struct dentry *proc_thread_self;
46 #ifdef CONFIG_BSD_PROCESS_ACCT
49 struct user_namespace *user_ns;
50 struct ucounts *ucounts;
51 struct work_struct proc_work;
54 int reboot; /* group exit code if this pidns was rebooted */
58 extern struct pid_namespace init_pid_ns;
60 #define PIDNS_HASH_ADDING (1U << 31)
63 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
65 if (ns != &init_pid_ns)
70 extern struct pid_namespace *copy_pid_ns(unsigned long flags,
71 struct user_namespace *user_ns, struct pid_namespace *ns);
72 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
73 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
74 extern void put_pid_ns(struct pid_namespace *ns);
76 #else /* !CONFIG_PID_NS */
77 #include <linux/err.h>
79 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
84 static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
85 struct user_namespace *user_ns, struct pid_namespace *ns)
87 if (flags & CLONE_NEWPID)
88 ns = ERR_PTR(-EINVAL);
92 static inline void put_pid_ns(struct pid_namespace *ns)
96 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
101 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
105 #endif /* CONFIG_PID_NS */
107 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
108 void pidhash_init(void);
109 void pidmap_init(void);
111 #endif /* _LINUX_PID_NS_H */