cdefpriv usage (was: bsd versus linux device drivers)

[Kostik Belousov]

On Sat, Sep 13, 2008 at 09:51:17PM -0700, vehemens wrote:
> On Thursday 11 September 2008 10:13:34 am vehemens wrote:
> ...
> > Looks like the ioctl get randomly fails with ENOENT.
> 
> Turned out to be a bug in my code.
> 
> > Something else is going on with mmap get which fails with EBADF almost all
> > of the time..
> 
> Looking at the man page and code, it appears that cdevpriv has not been 
> implemented for mmap.
Yes, d_mmap is mostly called from PF# context, where no associated
fp is available. This is fixable, but somewhat ugly.

> 
> I'm still somewhat confused about what cdevpriv is supposed to do.  I was 
> after per open private data association, and the code appears to only 
> implement per thread open private data association.

It is "after per open".
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