operate file in kernel space

Hi all,

I want to operate file in kernel space.
At present, I have found the following kernel routines, which operate file:
Kern_open(), kern_close(), kern_readv() and kern_writev().
Now, I have some doubt about these routines?
1 kern_open() doesn't return a file handle or file pointer?
As we know, filp_open(), which is a Linux kernel routine, returns a file 
pointer.
ZwCreateFile(), which is a Windows kernel routine, returns a file handle.

2 how can I "seek" a file in kernel space?
The function of "seek" routine is similar with generic_file_llseek()(Linux) or 
ZwSetInformationFile()(windows).

Thanks
Yongfan

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