编译驱动错误 variable `globalvar_fops' has initializer but incomplete type

#include <linux/module.h>
#include <linux/init.h>
#include </usr/src/linux-2.4.20-8/include/linux/fs.h>
#include <asm/uaccess.h>
#include <linux/kernel.h>
#include <errno.h>

#ifndef   __KERNEL__    
#define   __KERNEL__
#endif    
#ifndef   MODULE    
#define   MODULE    
#endif



MODULE_LICENSE ("GPL");

#define MAJOR_NUM 254



static ssize_t    globalvar_read(struct file  *, char *, size_t , loff_t * );
static ssize_t  globalvar_write(struct file *, const char *, size_t , loff_t *);


static int global_var=0;


static ssize_t globalvar_read(struct file *filp, char * buf, size_t len, loff_t *off)
{
  if(copy_to_user(buf, &global_var, sizeof(int)))
    {
      return -EFAULT;
    }

  return sizeof(int);

}

static ssize_t globalvar_write(struct file *filp, const char *buf, size_t len, loff_t *off)
{
  if(copy_from_user(&global_var, buf,sizeof(int)))
    {
      return  -EFAULT;
    }

  return sizeof(int);
}

static struct file_operations globalvar_fops =
{
 read: globalvar_read,
 write: globalvar_write,
  
} ;

static int  __init globalvar_init(void)
{
  int    ret;

  ret = register_chrdev(MAJOR_NUM, "glovalvar", &globalvar_fops);
  if(ret)
    {
      printk("global register failure");
    }
  else
    {
      printk("global register sucess");

    }

  return ret;

}

static int  __exit globalvar_exit(void)
{
  int    ret;

  ret = unregister_chrdev(MAJOR_NUM, "globalvar");
  if(ret)
    {
      printk("gloval unregister failure");
    }
  else
    {
      printk("global unregistr success");
    }

  return ret;
}


module_init(globalvar_init);
module_exit(globalvar_exit);


编译之

[root@localhost xu]# gcc -D_KERNEL_ -DMODULE -DLINUX -I /usr/src/linux-2.4.20-8/include -c -o globalvar.o  globalvar.c
 ............
globalvar.c: At top level:
globalvar.c:23: warning: `struct file' declared inside parameter list
globalvar.c:23: warning: its scope is only this definition or declaration, which is probably not what you want
globalvar.c:24: warning: `struct file' declared inside parameter list
globalvar.c:30: warning: `struct file' declared inside parameter list
globalvar.c:31: conflicting types for `globalvar_read'
globalvar.c:23: previous declaration of `globalvar_read'
globalvar.c:41: warning: `struct file' declared inside parameter list
globalvar.c:42: conflicting types for `globalvar_write'
globalvar.c:24: previous declaration of `globalvar_write'
globalvar.c:51: variable `globalvar_fops' has initializer but incomplete type
globalvar.c:53: unknown field `read' specified in initializer
globalvar.c:53: warning: excess elements in struct initializer
globalvar.c:53: warning: (near initialization for `globalvar_fops')
globalvar.c:54: unknown field `write' specified in initializer
globalvar.c:54: warning: excess elements in struct initializer
globalvar.c:54: warning: (near initialization for `globalvar_fops')
globalvar.c: In function `__cleanup_module_inline':
globalvar.c:96: warning: return from incompatible pointer type
globalvar.c: At top level:
globalvar.c:51: storage size of `globalvar_fops' isn't known

我是在 red hat 9  下编译的 usr/src/linux-2.4.20-8/include 是安装时自带的源码目录 gcc是red hat 9 自带的 gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)


总是出现这样的错误：
variable `globalvar_fops' has initializer but incomplete type
storage size of `globalvar_fops' isn't known

这困扰我几天了，刚学习驱动就这样困难，请高手指点！！非常感谢！

ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);

static ssize_t    globalvar_read(struct file  *, char *, size_t , loff_t * );
static ssize_t  globalvar_write(struct file *, const char *, size_t , loff_t *);

do you find some thing different? yes!

但是 那个应该不是问题的关键所在吧

请问这类问题斑竹解决了没有？