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