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