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 #endif 37 #ifdef CONFIG_BSD_PROCESS_ACCT 38 struct bsd_acct_struct *bacct; 39 #endif 40 struct user_namespace *user_ns; 41 struct work_struct proc_work; 42 kgid_t pid_gid; 43 int hide_pid; 44 int reboot; /* group exit code if this pidns was rebooted */ 45 unsigned int proc_inum; 46 }; 47 48 extern struct pid_namespace init_pid_ns; 49 50 #define PIDNS_HASH_ADDING (1U << 31) 51 52 #ifdef CONFIG_PID_NS 53 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 54 { 55 if (ns != &init_pid_ns) 56 kref_get(&ns->kref); 57 return ns; 58 } 59 60 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 61 struct user_namespace *user_ns, struct pid_namespace *ns); 62 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 63 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 64 extern void put_pid_ns(struct pid_namespace *ns); 65 66 #else /* !CONFIG_PID_NS */ 67 #include <linux/err.h> 68 69 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 70 { 71 return ns; 72 } 73 74 static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 75 struct user_namespace *user_ns, struct pid_namespace *ns) 76 { 77 if (flags & CLONE_NEWPID) 78 ns = ERR_PTR(-EINVAL); 79 return ns; 80 } 81 82 static inline void put_pid_ns(struct pid_namespace *ns) 83 { 84 } 85 86 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 87 { 88 BUG(); 89 } 90 91 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 92 { 93 return 0; 94 } 95 #endif /* CONFIG_PID_NS */ 96 97 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 98 void pidhash_init(void); 99 void pidmap_init(void); 100 101 #endif /* _LINUX_PID_NS_H */ 102