netdev - Re: [PATCH 04/31] net: add support for ->poll_mask in proto

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Message-ID: <20180108104846.GC5797@lst.de>
Date:   Mon, 8 Jan 2018 11:48:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>, Avi Kivity <avi@...lladb.com>,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/31] net: add support for ->poll_mask in proto_ops

On Sat, Jan 06, 2018 at 07:16:22PM +0000, Al Viro wrote:
> On Thu, Jan 04, 2018 at 09:00:16AM +0100, Christoph Hellwig wrote:
> > The socket file operations still implement ->poll until all protocols are
> > switched over.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > ---
> >  include/linux/net.h |  3 +++
> >  net/socket.c        | 61 +++++++++++++++++++++++++++++++++++++++++++++++++----
> >  2 files changed, 60 insertions(+), 4 deletions(-)
> > 
> > diff --git a/include/linux/net.h b/include/linux/net.h
> > index c2d468cb9821..94d65de30cb7 100644
> > --- a/include/linux/net.h
> > +++ b/include/linux/net.h
> > @@ -147,6 +147,9 @@ struct proto_ops {
> >  	int		(*getname)   (struct socket *sock,
> >  				      struct sockaddr *addr,
> >  				      int *sockaddr_len, int peer);
> > +	void		(*pre_poll)  (const struct sock *sk);
> 
> Description?  Or more descriptive name, for that matter...

One option might be to have the same get_poll_head semantics as
the file operation.  Which might actually be useful for the weird
things smc is doing, if they make any sense at all to start with.

> 
> > +	__poll_t	(*poll_mask) (struct file *file, struct socket *sock,
> > +				      __poll_t events);
> 
> Does that sucker need struct file?

Not really.  Especially as we could get that from sock->file if needed.
I'll drop it for the next version.