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 kgid_t pid_gid; 35 int hide_pid; 36 int reboot; /* group exit code if this pidns was rebooted */ 37 }; 38 39 extern struct pid_namespace init_pid_ns; 40 41 #ifdef CONFIG_PID_NS 42 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 43 { 44 if (ns != &init_pid_ns) 45 kref_get(&ns->kref); 46 return ns; 47 } 48 49 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns); 50 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 51 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 52 extern void put_pid_ns(struct pid_namespace *ns); 53 54 #else /* !CONFIG_PID_NS */ 55 #include <linux/err.h> 56 57 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 58 { 59 return ns; 60 } 61 62 static inline struct pid_namespace * 63 copy_pid_ns(unsigned long flags, struct pid_namespace *ns) 64 { 65 if (flags & CLONE_NEWPID) 66 ns = ERR_PTR(-EINVAL); 67 return ns; 68 } 69 70 static inline void put_pid_ns(struct pid_namespace *ns) 71 { 72 } 73 74 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 75 { 76 BUG(); 77 } 78 79 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 80 { 81 return 0; 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