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include/linux/proc_ns.h 2.44 KB
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  /* SPDX-License-Identifier: GPL-2.0 */
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  /*
   * procfs namespace bits
   */
  #ifndef _LINUX_PROC_NS_H
  #define _LINUX_PROC_NS_H
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  #include <linux/ns_common.h>
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  struct pid_namespace;
  struct nsproxy;
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  struct path;
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  struct task_struct;
  struct inode;
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  struct proc_ns_operations {
  	const char *name;
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  	const char *real_ns_name;
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  	int type;
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  	struct ns_common *(*get)(struct task_struct *task);
  	void (*put)(struct ns_common *ns);
  	int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
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  	struct user_namespace *(*owner)(struct ns_common *ns);
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  	struct ns_common *(*get_parent)(struct ns_common *ns);
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  } __randomize_layout;
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  extern const struct proc_ns_operations netns_operations;
  extern const struct proc_ns_operations utsns_operations;
  extern const struct proc_ns_operations ipcns_operations;
  extern const struct proc_ns_operations pidns_operations;
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  extern const struct proc_ns_operations pidns_for_children_operations;
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  extern const struct proc_ns_operations userns_operations;
  extern const struct proc_ns_operations mntns_operations;
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  extern const struct proc_ns_operations cgroupns_operations;
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  /*
   * We always define these enumerators
   */
  enum {
  	PROC_ROOT_INO		= 1,
  	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,
  	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,
  	PROC_USER_INIT_INO	= 0xEFFFFFFDU,
  	PROC_PID_INIT_INO	= 0xEFFFFFFCU,
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  	PROC_CGROUP_INIT_INO	= 0xEFFFFFFBU,
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  };
  
  #ifdef CONFIG_PROC_FS
  
  extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  extern void pid_ns_release_proc(struct pid_namespace *ns);
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  extern int proc_alloc_inum(unsigned int *pino);
  extern void proc_free_inum(unsigned int inum);
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  #else /* CONFIG_PROC_FS */
  
  static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
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  static inline int proc_alloc_inum(unsigned int *inum)
  {
  	*inum = 1;
  	return 0;
  }
  static inline void proc_free_inum(unsigned int inum) {}
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  #endif /* CONFIG_PROC_FS */
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  static inline int ns_alloc_inum(struct ns_common *ns)
  {
  	atomic_long_set(&ns->stashed, 0);
  	return proc_alloc_inum(&ns->inum);
  }
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  #define ns_free_inum(ns) proc_free_inum((ns)->inum)
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  extern struct file *proc_ns_fget(int fd);
  #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  extern void *ns_get_path(struct path *path, struct task_struct *task,
  			const struct proc_ns_operations *ns_ops);
  
  extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  			const struct proc_ns_operations *ns_ops);
  extern void nsfs_init(void);
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  #endif /* _LINUX_PROC_NS_H */