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 free_pid_ns(struct kref *kref); 51 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 52 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 53 54 static inline void put_pid_ns(struct pid_namespace *ns) 55 { 56 if (ns != &init_pid_ns) 57 kref_put(&ns->kref, free_pid_ns); 58 } 59 60 #else /* !CONFIG_PID_NS */ 61 #include <linux/err.h> 62 63 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 64 { 65 return ns; 66 } 67 68 static inline struct pid_namespace * 69 copy_pid_ns(unsigned long flags, struct pid_namespace *ns) 70 { 71 if (flags & CLONE_NEWPID) 72 ns = ERR_PTR(-EINVAL); 73 return ns; 74 } 75 76 static inline void put_pid_ns(struct pid_namespace *ns) 77 { 78 } 79 80 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 81 { 82 BUG(); 83 } 84 85 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 86 { 87 return 0; 88 } 89 #endif /* CONFIG_PID_NS */ 90 91 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 92 void pidhash_init(void); 93 void pidmap_init(void); 94 95 #endif /* _LINUX_PID_NS_H */ 96