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DragonFly kernel List (threaded) for 2011-02
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Re: race condition in knote deletion?

From: "Samuel J. Greear" <sjg@xxxxxxxxxxxx>
Date: Wed, 2 Feb 2011 10:53:02 -0700

On Tue, Feb 1, 2011 at 8:58 PM, Matthew Dillon
<dillon@apollo.backplane.com> wrote:
>    One thing I think may be a liability is the knote migration to devfs
>    on detach.  I think it might be better to implement the knotes in devfs
>    only and make devices use the devfs-supplied structure(s) (probably just
>    dev_t, even) for managing knotes.
>                                                        -Matt

I have been contemplating this a bit too -- how to make the filters
more stateless (get rid of the lists) or at least make the list
handling more implicit.

This seems like a reasonable approach. I think I would be in favor of
going about a refactor in the way you describe, assuming that we
export a new interface/api from devfs for devices with a devfs node
and that api is kept seperate from the existing kq api's (I guess it
would be a wrapper), which will continue to service files/sockets (and
devfs) directly. I think it is already a relatively confusing
subsystem and drawing a line there would at least keep it from
becoming more complicated.


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