include/linux/proc_ns.h

   1 /*
   2  * procfs namespace bits
   3  */
   4 #ifndef _LINUX_PROC_NS_H
   5 #define _LINUX_PROC_NS_H
   6
   7 #include <linux/ns_common.h>
   8
   9 struct pid_namespace;
  10 struct nsproxy;
  11 struct path;
  12 struct task_struct;
  13 struct inode;
  14
  15 struct proc_ns_operations {
  16         const char *name;
  17         int type;
  18         struct ns_common *(*get)(struct task_struct *task);
  19         void (*put)(struct ns_common *ns);
  20         int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
  21         struct user_namespace *(*owner)(struct ns_common *ns);
  22 };
  23
  24 extern const struct proc_ns_operations netns_operations;
  25 extern const struct proc_ns_operations utsns_operations;
  26 extern const struct proc_ns_operations ipcns_operations;
  27 extern const struct proc_ns_operations pidns_operations;
  28 extern const struct proc_ns_operations userns_operations;
  29 extern const struct proc_ns_operations mntns_operations;
  30 extern const struct proc_ns_operations cgroupns_operations;
  31
  32 /*
  33  * We always define these enumerators
  34  */
  35 enum {
  36         PROC_ROOT_INO           = 1,
  37         PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
  38         PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
  39         PROC_USER_INIT_INO      = 0xEFFFFFFDU,
  40         PROC_PID_INIT_INO       = 0xEFFFFFFCU,
  41         PROC_CGROUP_INIT_INO    = 0xEFFFFFFBU,
  42 };
  43
  44 #ifdef CONFIG_PROC_FS
  45
  46 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  47 extern void pid_ns_release_proc(struct pid_namespace *ns);
  48 extern int proc_alloc_inum(unsigned int *pino);
  49 extern void proc_free_inum(unsigned int inum);
  50
  51 #else /* CONFIG_PROC_FS */
  52
  53 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  54 static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  55
  56 static inline int proc_alloc_inum(unsigned int *inum)
  57 {
  58         *inum = 1;
  59         return 0;
  60 }
  61 static inline void proc_free_inum(unsigned int inum) {}
  62
  63 #endif /* CONFIG_PROC_FS */
  64
  65 static inline int ns_alloc_inum(struct ns_common *ns)
  66 {
  67         atomic_long_set(&ns->stashed, 0);
  68         return proc_alloc_inum(&ns->inum);
  69 }
  70
  71 #define ns_free_inum(ns) proc_free_inum((ns)->inum)
  72
  73 extern struct file *proc_ns_fget(int fd);
  74 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  75 extern void *ns_get_path(struct path *path, struct task_struct *task,
  76                         const struct proc_ns_operations *ns_ops);
  77
  78 extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  79                         const struct proc_ns_operations *ns_ops);
  80 extern void nsfs_init(void);
  81
  82 #endif /* _LINUX_PROC_NS_H */