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