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 struct pid_namespace;
   8 struct nsproxy;
   9
  10 struct proc_ns_operations {
  11         const char *name;
  12         int type;
  13         void *(*get)(struct task_struct *task);
  14         void (*put)(void *ns);
  15         int (*install)(struct nsproxy *nsproxy, void *ns);
  16         unsigned int (*inum)(void *ns);
  17 };
  18
  19 struct proc_ns {
  20         void *ns;
  21         const struct proc_ns_operations *ns_ops;
  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
  31 /*
  32  * We always define these enumerators
  33  */
  34 enum {
  35         PROC_ROOT_INO           = 1,
  36         PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
  37         PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
  38         PROC_USER_INIT_INO      = 0xEFFFFFFDU,
  39         PROC_PID_INIT_INO       = 0xEFFFFFFCU,
  40 };
  41
  42 #ifdef CONFIG_PROC_FS
  43
  44 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  45 extern void pid_ns_release_proc(struct pid_namespace *ns);
  46 extern struct file *proc_ns_fget(int fd);
  47 extern struct proc_ns *get_proc_ns(struct inode *);
  48 extern int proc_alloc_inum(unsigned int *pino);
  49 extern void proc_free_inum(unsigned int inum);
  50 extern bool proc_ns_inode(struct inode *inode);
  51
  52 #else /* CONFIG_PROC_FS */
  53
  54 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  55 static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  56
  57 static inline struct file *proc_ns_fget(int fd)
  58 {
  59         return ERR_PTR(-EINVAL);
  60 }
  61
  62 static inline struct proc_ns *get_proc_ns(struct inode *inode) { return NULL; }
  63
  64 static inline int proc_alloc_inum(unsigned int *inum)
  65 {
  66         *inum = 1;
  67         return 0;
  68 }
  69 static inline void proc_free_inum(unsigned int inum) {}
  70 static inline bool proc_ns_inode(struct inode *inode) { return false; }
  71
  72 #endif /* CONFIG_PROC_FS */
  73
  74 #endif /* _LINUX_PROC_NS_H */