On Thu, May 31 2007, Hugh Dickins wrote:
> On Thu, 31 May 2007, Jens Axboe wrote:
> >
> > This patch removes the ->sendfile() hook from the file_operations
> > structure, and replaces the sys_sendfile() mechanism to be based on
> > ->splice_read() instead. There should be no functional changes.
> >
> > Work to be done:
> >
> > - The ext2 xip support needs a splice_read() implementation, currently I
> > just if 0'ed out the send xip_file_sendfile(). CC'ed Carsten, who
> > seems to be the author of this code.
> >
> > - shmem needs a splice_read() implementation. Optimistically CC'ed Hugh.
>
> I'll take that "Optimistically" as a special compliment,
> rather than as a particular insult ;)
It's a compliment for sure, the "optimistically" was just mentioned
because there are lots of people mentioned in that file, but I mostly
remember you doing some heavy lifting there :-)
> Yes, thanks, please leave shmem_file_splice_read() to me, I'll give
> it priority now. Not deep enough in yet, but I'll probably aim for
> something simple-minded (correct but slow once it hits swap).
Super, thanks!!
> > - nfds: The ->rq_sendfile_ok optimization is gone for now. I can't
> > determine the value of it, but I'm assuming it's there for a reason.
> > Any chance this can be converted to splice, or use something else than
> > ->sendfile()? CC'ed Neil.
> >
> > - relay: needs a splice_read() implementation. I think Tom already has
> > one, CC'ed him.
> >
> > Apart from that, it was mostly straight forward. Almost everybody uses
> > generic_file_sendfile(), which makes the conversion easy. I changed loop
> > to use do_generic_file_read() instead of sendfile, it works for me...
>
> Christoph already picked up on that, and it's of interest to shmem too:
> loop over tmpfs in 2.6 was relying on shmem_file_sendfile, for which
> the generic route is not good enough.
>
> If we're giving a .splice_read to everything which used to have a
> .sendfile, then I think you just need to make do_lo_read() use
> ->splice_read now?
Yes, I will make that change myself. I can do that, as I seem to have
sucessfully pushed out the remaining work to others :-)
--
Jens Axboe
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