kernel newb -- read/write to a local file from in kernel

[Stanislav Sedov]

On Mon, Sep 05, 2005 at 01:44:33AM -0500, Jeb Campbell wrote:
> I'm trying to learn about kernel programming and as a weekend project 
> I've started writing a Netgraph to file/dev module.
> 
> The Netgraph stuff was pretty easy, but I'm at a loss on the file access 
> part as I've never done anything in-kernel.
> 
> After much searching (most of it not knowing what I was looking for), I 
> think that I'm looking for something like "Vnode interface mechanics, 
> write to a local file" as taught in Mr. McKusick's "FreeBSD Kernel 
> Internals: An Intensive Code Walkthrough".
> 
> I've looked at nullfs/null_vnops.c, but I think that is more of a 
> pass-through example.  Does anyone know of any online code that shows 
> the process of opening a file/device for read/write?
> 
> Thanks in advance if someone has any tips or more info.
> 
> (and sorry to bother the kernel hackers with such a newbie question)
> 
> -- 
> Jeb Campbell
> jeb at c4solutions.net
> 
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> 

Look throgh md(4) driver source (/sys/dev/md) - it is a good example.