struct file_operations {
  struct module *owner;

  loff_t (*llseek) (struct file *, loff_t, int);
  ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
  ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
  ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
  ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);

  int (*readdir) (struct file *, void *, filldir_t);
  unsigned int (*poll) (struct file *, struct poll_table_struct *);

  int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
  long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
  long (*compat_ioctl) (struct file *, unsigned int, unsigned long);

  int (*mmap) (struct file *, struct vm_area_struct *);
  int (*open) (struct inode *, struct file *);
  int (*flush) (struct file *);
  int (*release) (struct inode *, struct file *);

  int (*fsync) (struct file *, struct dentry *, int datasync);
  int (*aio_fsync) (struct kiocb *, int datasync);
  int (*fasync) (int, struct file *, int);
  int (*lock) (struct file *, int, struct file_lock *);

  ssize_t (*readv) (
    struct file *, const struct iovec *, unsigned long, loff_t *);
  ssize_t (*writev) (
    struct file *, const struct iovec *, unsigned long, loff_t *);

  ssize_t (*sendfile) (
    struct file *, loff_t *, size_t, read_actor_t, void *);
  ssize_t (*sendpage) (
    struct file *, struct page *, int, size_t, loff_t *, int);

  unsigned long (*get_unmapped_area) (
    struct file *, unsigned long, unsigned long,
    unsigned long, unsigned long);

  int (*check_flags)(int);
  int (*dir_notify)(struct file *filp, unsigned long arg);
  int (*flock) (struct file *, int, struct file_lock *);
};