LXR linux/include/linux/proc

   1/*
   2 * procfs namespace bits
   3 */
   4#ifndef _LINUX_PROC_NS_H
   5#define _LINUX_PROC_NS_H
   6
   7struct pid_namespace;
   8struct nsproxy;
   9
  10struct 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
  19struct proc_ns {
  20        void *ns;
  21        const struct proc_ns_operations *ns_ops;
  22};
  23
  24extern const struct proc_ns_operations netns_operations;
  25extern const struct proc_ns_operations utsns_operations;
  26extern const struct proc_ns_operations ipcns_operations;
  27extern const struct proc_ns_operations pidns_operations;
  28extern const struct proc_ns_operations userns_operations;
  29extern const struct proc_ns_operations mntns_operations;
  30
  31/*
  32 * We always define these enumerators
  33 */
  34enum {
  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
  44extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  45extern void pid_ns_release_proc(struct pid_namespace *ns);
  46extern struct file *proc_ns_fget(int fd);
  47extern struct proc_ns *get_proc_ns(struct inode *);
  48extern int proc_alloc_inum(unsigned int *pino);
  49extern void proc_free_inum(unsigned int inum);
  50extern bool proc_ns_inode(struct inode *inode);
  51
  52#else /* CONFIG_PROC_FS */
  53
  54static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  55static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  56
  57static inline struct file *proc_ns_fget(int fd)
  58{
  59        return ERR_PTR(-EINVAL);
  60}
  61
  62static inline struct proc_ns *get_proc_ns(struct inode *inode) { return NULL; }
  63
  64static inline int proc_alloc_inum(unsigned int *inum)
  65{
  66        *inum = 1;
  67        return 0;
  68}
  69static inline void proc_free_inum(unsigned int inum) {}
  70static inline bool proc_ns_inode(struct inode *inode) { return false; }
  71
  72#endif /* CONFIG_PROC_FS */
  73
  74#endif /* _LINUX_PROC_NS_H */
  75