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