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 */