1 #ifndef _LINUX_PID_NS_H 2 #define _LINUX_PID_NS_H 3 4 #include <linux/sched.h> 5 #include <linux/bug.h> 6 #include <linux/mm.h> 7 #include <linux/threads.h> 8 #include <linux/nsproxy.h> 9 #include <linux/kref.h> 10 11 struct pidmap { 12 atomic_t nr_free; 13 void *page; 14 }; 15 16 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8) 17 18 struct bsd_acct_struct; 19 20 struct pid_namespace { 21 struct kref kref; 22 struct pidmap pidmap[PIDMAP_ENTRIES]; 23 int last_pid; 24 int nr_hashed; 25 struct task_struct *child_reaper; 26 struct kmem_cache *pid_cachep; 27 unsigned int level; 28 struct pid_namespace *parent; 29 #ifdef CONFIG_PROC_FS 30 struct vfsmount *proc_mnt; 31 #endif 32 #ifdef CONFIG_BSD_PROCESS_ACCT 33 struct bsd_acct_struct *bacct; 34 #endif 35 struct user_namespace *user_ns; 36 struct work_struct proc_work; 37 kgid_t pid_gid; 38 int hide_pid; 39 int reboot; /* group exit code if this pidns was rebooted */ 40 }; 41 42 extern struct pid_namespace init_pid_ns; 43 44 #ifdef CONFIG_PID_NS 45 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 46 { 47 if (ns != &init_pid_ns) 48 kref_get(&ns->kref); 49 return ns; 50 } 51 52 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 53 struct user_namespace *user_ns, struct pid_namespace *ns); 54 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 55 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 56 extern void put_pid_ns(struct pid_namespace *ns); 57 58 #else /* !CONFIG_PID_NS */ 59 #include <linux/err.h> 60 61 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 62 { 63 return ns; 64 } 65 66 static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 67 struct user_namespace *user_ns, struct pid_namespace *ns) 68 { 69 if (flags & CLONE_NEWPID) 70 ns = ERR_PTR(-EINVAL); 71 return ns; 72 } 73 74 static inline void put_pid_ns(struct pid_namespace *ns) 75 { 76 } 77 78 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 79 { 80 BUG(); 81 } 82 83 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 84 { 85 return 0; 86 } 87 #endif /* CONFIG_PID_NS */ 88 89 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 90 void pidhash_init(void); 91 void pidmap_init(void); 92 93 #endif /* _LINUX_PID_NS_H */ 94