error message:
原因： 从2.6.36开始，file_operations结构发生了重大变化
具体看 xx../include/linux/fs.h定义：
取消了原先的
int (*ioctl)(struct inode*, struct file*, unsigned int, unsigned long);
添加来新的成员
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);原来的ioctl 但是返回值变为long
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);内核空间64位，用户空间32位
所以：
1，取消inode:
2，使用unlocked_ioctl
OK.
error: unknown field 'ioctl' specified in initializer,布布扣,bubuko.com
error: unknown field 'ioctl' specified in initializer
原文：http://www.cnblogs.com/skynext/p/3880682.html