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 #include <linux/ns_common.h>
   8
   9 struct pid_namespace;
  10 struct nsproxy;
  11 struct path;
  12 struct task_struct;
  13 struct inode;
  14
  15 struct 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 };
  25
  26 extern const struct proc_ns_operations netns_operations;
  27 extern const struct proc_ns_operations utsns_operations;
  28 extern const struct proc_ns_operations ipcns_operations;
  29 extern const struct proc_ns_operations pidns_operations;
  30 extern const struct proc_ns_operations pidns_for_children_operations;
  31 extern const struct proc_ns_operations userns_operations;
  32 extern const struct proc_ns_operations mntns_operations;
  33 extern const struct proc_ns_operations cgroupns_operations;
  34
  35 /*
  36  * We always define these enumerators
  37  */
  38 enum {
  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
  49 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  50 extern void pid_ns_release_proc(struct pid_namespace *ns);
  51 extern int proc_alloc_inum(unsigned int *pino);
  52 extern void proc_free_inum(unsigned int inum);
  53
  54 #else /* CONFIG_PROC_FS */
  55
  56 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  57 static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  58
  59 static inline int proc_alloc_inum(unsigned int *inum)
  60 {
  61         *inum = 1;
  62         return 0;
  63 }
  64 static inline void proc_free_inum(unsigned int inum) {}
  65
  66 #endif /* CONFIG_PROC_FS */
  67
  68 static 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
  76 extern struct file *proc_ns_fget(int fd);
  77 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  78 extern void *ns_get_path(struct path *path, struct task_struct *task,
  79                         const struct proc_ns_operations *ns_ops);
  80
  81 extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  82                         const struct proc_ns_operations *ns_ops);
  83 extern void nsfs_init(void);
  84
  85 #endif /* _LINUX_PROC_NS_H */