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/workqueue.h> 8 #include <linux/threads.h> 9 #include <linux/nsproxy.h> 10 #include <linux/kref.h> 11 #include <linux/ns_common.h> 12 13 struct pidmap { 14 atomic_t nr_free; 15 void *page; 16 }; 17 18 #define BITS_PER_PAGE (PAGE_SIZE * 8) 19 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) 20 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE) 21 22 struct fs_pin; 23 24 struct pid_namespace { 25 struct kref kref; 26 struct pidmap pidmap[PIDMAP_ENTRIES]; 27 struct rcu_head rcu; 28 int last_pid; 29 unsigned int nr_hashed; 30 struct task_struct *child_reaper; 31 struct kmem_cache *pid_cachep; 32 unsigned int level; 33 struct pid_namespace *parent; 34 #ifdef CONFIG_PROC_FS 35 struct vfsmount *proc_mnt; 36 struct dentry *proc_self; 37 struct dentry *proc_thread_self; 38 #endif 39 #ifdef CONFIG_BSD_PROCESS_ACCT 40 struct fs_pin *bacct; 41 #endif 42 struct user_namespace *user_ns; 43 struct ucounts *ucounts; 44 struct work_struct proc_work; 45 kgid_t pid_gid; 46 int hide_pid; 47 int reboot; /* group exit code if this pidns was rebooted */ 48 struct ns_common ns; 49 }; 50 51 extern struct pid_namespace init_pid_ns; 52 53 #define PIDNS_HASH_ADDING (1U << 31) 54 55 #ifdef CONFIG_PID_NS get_pid_ns(struct pid_namespace * ns)56static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 57 { 58 if (ns != &init_pid_ns) 59 kref_get(&ns->kref); 60 return ns; 61 } 62 63 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 64 struct user_namespace *user_ns, struct pid_namespace *ns); 65 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 66 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 67 extern void put_pid_ns(struct pid_namespace *ns); 68 69 #else /* !CONFIG_PID_NS */ 70 #include <linux/err.h> 71 get_pid_ns(struct pid_namespace * ns)72static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 73 { 74 return ns; 75 } 76 copy_pid_ns(unsigned long flags,struct user_namespace * user_ns,struct pid_namespace * ns)77static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 78 struct user_namespace *user_ns, struct pid_namespace *ns) 79 { 80 if (flags & CLONE_NEWPID) 81 ns = ERR_PTR(-EINVAL); 82 return ns; 83 } 84 put_pid_ns(struct pid_namespace * ns)85static inline void put_pid_ns(struct pid_namespace *ns) 86 { 87 } 88 zap_pid_ns_processes(struct pid_namespace * ns)89static inline void zap_pid_ns_processes(struct pid_namespace *ns) 90 { 91 BUG(); 92 } 93 reboot_pid_ns(struct pid_namespace * pid_ns,int cmd)94static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 95 { 96 return 0; 97 } 98 #endif /* CONFIG_PID_NS */ 99 100 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 101 void pidhash_init(void); 102 void pidmap_init(void); 103 104 #endif /* _LINUX_PID_NS_H */ 105