LXR linux/include/linux/proc

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