linux-kernel - Re: [RFC PATCH 3/4] io_uring/splice: support splice from ->splice_read to ->splice

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Message-ID: <Y2oJAlV3xwqmJK0o@infradead.org>
Date:   Mon, 7 Nov 2022 23:45:06 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        ZiyangZhang <ZiyangZhang@...ux.alibaba.com>
Subject: Re: [RFC PATCH 3/4] io_uring/splice: support splice from
 ->splice_read to ->splice_read

On Thu, Nov 03, 2022 at 04:50:03PM +0800, Ming Lei wrote:
> The 1st ->splice_read produces buffer to the pipe of
> current->splice_pipe, and the 2nd ->splice_read consumes the buffer
> in this pipe.

This looks really ugly.  I think you want Linus and Al to look over
it at very least.

Also, what is going to happen if your ->splice_read instance does not
support the flag to magically do something entirely different?