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