[Bug 225934] FIFOs lack kevent EVFILT_VNODE support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225934

Mark Johnston <markj at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj at FreeBSD.org

--- Comment #1 from Mark Johnston <markj at FreeBSD.org> ---
Indeed, at the end of fifo_open() we set the file's ops table to pipeops. 
pipe_kqfilter() has no way of attaching a knote to the fifo vnode.  We could
perhaps handle it with a new file ops table for fifos: every operation except
kqfilter would just be the corresponding operation in pipeops.  fifo_kqfilter()
would attempt to handle EVFILT_VNODE by calling vfs_kqfilter() and otherwise
would call pipe_kqfilter().

Another option might be to maintain a backpointer from the pipe structure to
the vnode for named pipes.

BTW there is some dead code here, I can't see how ufsfifo_kqfilter() can ever
get called.

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