Optional mmap(2) support for geom(4) providers

[Maxim Sobolev]

On Tue, May 16, 2006 at 07:40:36AM +0200, Poul-Henning Kamp wrote:
> In message <4468DC05.9080808 at sippysoft.com>, Maxim Sobolev writes:
> >Poul-Henning Kamp wrote:
> >> In message <44681D92.80309 at sippysoft.com>, Maxim Sobolev writes:
> >>> Hi,
> >>>
> >>> I would like to extend md(4) with support for mmap(4) operations, 
> >> 
> >> Uhm, how exactly would that work ?
> >
> >Just like ioctl(2) works: geom_dev will accept mmap requests and pass it 
> >to the underlying provider for execution if that provider has mmap 
> >handler in its g_class.
> 
> No, I meant: how will you use this ?

Well, in my particular case I would like to experiment with
dynamic exporting of shared ELF objects from the kernel into
userspace. md(4) seems like a good fit, but dlopen(3) uses
mmap, so that it doesn't work OOB. There can be other uses
as well.

-Maxim