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 unsigned int proc_inum; 41 }; 42 43 extern struct pid_namespace init_pid_ns; 44 45 #ifdef CONFIG_PID_NS 46 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 47 { 48 if (ns != &init_pid_ns) 49 kref_get(&ns->kref); 50 return ns; 51 } 52 53 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 54 struct user_namespace *user_ns, struct pid_namespace *ns); 55 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 56 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 57 extern void put_pid_ns(struct pid_namespace *ns); 58 59 #else /* !CONFIG_PID_NS */ 60 #include <linux/err.h> 61 62 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 63 { 64 return ns; 65 } 66 67 static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 68 struct user_namespace *user_ns, struct pid_namespace *ns) 69 { 70 if (flags & CLONE_NEWPID) 71 ns = ERR_PTR(-EINVAL); 72 return ns; 73 } 74 75 static inline void put_pid_ns(struct pid_namespace *ns) 76 { 77 } 78 79 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 80 { 81 BUG(); 82 } 83 84 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 85 { 86 return 0; 87 } 88 #endif /* CONFIG_PID_NS */ 89 90 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 91 void pidhash_init(void); 92 void pidmap_init(void); 93 94 #endif /* _LINUX_PID_NS_H */ 95