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