file_operations

scull 设备驱动只实现最重要的设备方法. 它的 file_operations 结构是如下初始化的:

struct file_operations scull_fops = {
 .owner =  THIS_MODULE, 
 .llseek =  scull_llseek, 
 .read =  scull_read, 
 .write =  scull_write, 
 .ioctl =  scull_ioctl, 
 .open =  scull_open, 
 .release =  scull_release,  
};