/* SPDX-License-Identifier: GPL-2.0 */

  /*
   * Wrapper functions for accessing the file_struct fd array.
   */
  
  #ifndef __LINUX_FILE_H
  #define __LINUX_FILE_H

  #include <linux/compiler.h>

  #include <linux/types.h>

  #include <linux/posix_types.h>

  #include <linux/errno.h>

  struct file;

  extern void fput(struct file *);

  extern void fput_many(struct file *, unsigned int);

  struct file_operations;

  struct task_struct;

  struct vfsmount;
  struct dentry;

  struct inode;

  struct path;

  extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
  	const char *, int flags, const struct file_operations *);

  extern struct file *alloc_file_clone(struct file *, int flags,
  	const struct file_operations *);

  static inline void fput_light(struct file *file, int fput_needed)
  {

  	if (fput_needed)

  		fput(file);
  }

  struct fd {
  	struct file *file;

  	unsigned int flags;

  };

  #define FDPUT_FPUT       1
  #define FDPUT_POS_UNLOCK 2

  
  static inline void fdput(struct fd fd)
  {

  	if (fd.flags & FDPUT_FPUT)

  		fput(fd.file);
  }

  extern struct file *fget(unsigned int fd);

  extern struct file *fget_many(unsigned int fd, unsigned int refs);

  extern struct file *fget_raw(unsigned int fd);

  extern struct file *fget_task(struct task_struct *task, unsigned int fd);

  extern unsigned long __fdget(unsigned int fd);
  extern unsigned long __fdget_raw(unsigned int fd);
  extern unsigned long __fdget_pos(unsigned int fd);

  extern void __f_unlock_pos(struct file *);

  static inline struct fd __to_fd(unsigned long v)

  {

  	return (struct fd){(struct file *)(v & ~3),v & 3};

  }

  static inline struct fd fdget(unsigned int fd)
  {
  	return __to_fd(__fdget(fd));
  }

  static inline struct fd fdget_raw(unsigned int fd)
  {

  	return __to_fd(__fdget_raw(fd));

  }

  static inline struct fd fdget_pos(int fd)
  {
  	return __to_fd(__fdget_pos(fd));
  }
  
  static inline void fdput_pos(struct fd f)
  {
  	if (f.flags & FDPUT_POS_UNLOCK)
  		__f_unlock_pos(f.file);
  	fdput(f);
  }

  extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);

  extern int replace_fd(unsigned fd, struct file *file, unsigned flags);

  extern void set_close_on_exec(unsigned int fd, int flag);

  extern bool get_close_on_exec(unsigned int fd);

  extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile);

  extern int get_unused_fd_flags(unsigned flags);

  extern void put_unused_fd(unsigned int fd);

  extern void fd_install(unsigned int fd, struct file *file);

  extern int __receive_fd(int fd, struct file *file, int __user *ufd,

  			unsigned int o_flags);
  static inline int receive_fd_user(struct file *file, int __user *ufd,
  				  unsigned int o_flags)
  {

  	if (ufd == NULL)
  		return -EFAULT;

  	return __receive_fd(-1, file, ufd, o_flags);

  }

  static inline int receive_fd(struct file *file, unsigned int o_flags)
  {

  	return __receive_fd(-1, file, NULL, o_flags);
  }
  static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
  {
  	return __receive_fd(fd, file, NULL, o_flags);

  }

  extern void flush_delayed_fput(void);
  extern void __fput_sync(struct file *);

  extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;

  #endif /* __LINUX_FILE_H */