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 struct task_struct *child_reaper; 25 struct kmem_cache *pid_cachep; 26 unsigned int level; 27 struct pid_namespace *parent; 28 #ifdef CONFIG_PROC_FS 29 struct vfsmount *proc_mnt; 30 #endif 31 #ifdef CONFIG_BSD_PROCESS_ACCT 32 struct bsd_acct_struct *bacct; 33 #endif 34 gid_t pid_gid; 35 int hide_pid; 36 }; 37 38 extern struct pid_namespace init_pid_ns; 39 40 #ifdef CONFIG_PID_NS 41 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 42 { 43 if (ns != &init_pid_ns) 44 kref_get(&ns->kref); 45 return ns; 46 } 47 48 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns); 49 extern void free_pid_ns(struct kref *kref); 50 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 51 52 static inline void put_pid_ns(struct pid_namespace *ns) 53 { 54 if (ns != &init_pid_ns) 55 kref_put(&ns->kref, free_pid_ns); 56 } 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 * 67 copy_pid_ns(unsigned long flags, 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 79 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 80 { 81 BUG(); 82 } 83 #endif /* CONFIG_PID_NS */ 84 85 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 86 void pidhash_init(void); 87 void pidmap_init(void); 88 89 #endif /* _LINUX_PID_NS_H */ 90