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;
  12struct task_struct;
  13struct inode;
  14
  15struct proc_ns_operations {
  16        const char *name;
  17        const char *real_ns_name;
  18        int type;
  19        struct ns_common *(*get)(struct task_struct *task);
  20        void (*put)(struct ns_common *ns);
  21        int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
  22        struct user_namespace *(*owner)(struct ns_common *ns);
  23        struct ns_common *(*get_parent)(struct ns_common *ns);
  24} __randomize_layout;
  25
  26extern const struct proc_ns_operations netns_operations;
  27extern const struct proc_ns_operations utsns_operations;
  28extern const struct proc_ns_operations ipcns_operations;
  29extern const struct proc_ns_operations pidns_operations;
  30extern const struct proc_ns_operations pidns_for_children_operations;
  31extern const struct proc_ns_operations userns_operations;
  32extern const struct proc_ns_operations mntns_operations;
  33extern const struct proc_ns_operations cgroupns_operations;
  34
  35/*
  36 * We always define these enumerators
  37 */
  38enum {
  39        PROC_ROOT_INO           = 1,
  40        PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
  41        PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
  42        PROC_USER_INIT_INO      = 0xEFFFFFFDU,
  43        PROC_PID_INIT_INO       = 0xEFFFFFFCU,
  44        PROC_CGROUP_INIT_INO    = 0xEFFFFFFBU,
  45};
  46
  47#ifdef CONFIG_PROC_FS
  48
  49extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  50extern void pid_ns_release_proc(struct pid_namespace *ns);
  51extern int proc_alloc_inum(unsigned int *pino);
  52extern void proc_free_inum(unsigned int inum);
  53
  54#else /* CONFIG_PROC_FS */
  55
  56static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  57static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  58
  59static inline int proc_alloc_inum(unsigned int *inum)
  60{
  61        *inum = 1;
  62        return 0;
  63}
  64static inline void proc_free_inum(unsigned int inum) {}
  65
  66#endif /* CONFIG_PROC_FS */
  67
  68static inline int ns_alloc_inum(struct ns_common *ns)
  69{
  70        atomic_long_set(&ns->stashed, 0);
  71        return proc_alloc_inum(&ns->inum);
  72}
  73
  74#define ns_free_inum(ns) proc_free_inum((ns)->inum)
  75
  76extern struct file *proc_ns_fget(int fd);
  77#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  78extern void *ns_get_path(struct path *path, struct task_struct *task,
  79                        const struct proc_ns_operations *ns_ops);
  80
  81extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  82                        const struct proc_ns_operations *ns_ops);
  83extern void nsfs_init(void);
  84
  85#endif /* _LINUX_PROC_NS_H */
  86