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