linux-kernel - Re: [PATCH v17 03/14] shmem: Implement splice-read

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Message-ID: <CAHk-=wh-OKQdK2AE+CD_Y5bimnoSH=_4+F5EOZoGUf3SGJdxGA@mail.gmail.com>
Date:   Tue, 14 Mar 2023 12:07:36 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Matthew Wilcox <willy@...radead.org>, Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Daniel Golle <daniel@...rotopia.org>,
        Guenter Roeck <groeck7@...il.com>,
        Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH v17 03/14] shmem: Implement splice-read

On Tue, Mar 14, 2023 at 11:26 AM David Howells <dhowells@...hat.com> wrote:
>
> Are you okay if we go with my current patch for the moment?

I  guess.

But please at least stop doing the

     get_page(buf->page);

on the zero-page (which includes using no-op .get and .put functions
in  zero_pipe_buf_ops().

Maybe we can do /dev/null some day and actually have a common case for those.

             Linus