Refactoring asynchronous I/O

[Jilles Tjoelker]

On Wed, Feb 10, 2016 at 04:21:30PM -0800, John Baldwin wrote:
> I've pushed a new version with a vfs.aio.enable_unsafe sysctl
> (defaults to off).  If you think this is ok then I'll work on cleaning
> up some of the module bits (removing the unload support mostly).  I
> figure marking the syscalls as STD and removing all the helper stuff
> can be done as a followup commit to reduce extra noise in this diff
> (which is large enough on its own).

> https://github.com/freebsd/freebsd/compare/master...bsdjhb:aio_rework

> (Also, for the inital commit I will leave out the socket protocol
> hook.  That can be added later.)

Looks good to me, except that the error should be [ENOTSUP] instead of
the overloaded [EINVAL].

-- 
Jilles Tjoelker