linux-kernel - Re: [RFC PATCH] fs: Make splice() and tee() take into account O

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Date:   Mon, 4 Mar 2019 16:09:22 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Slavomir Kaslev <kaslevs@...are.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] fs: Make splice() and tee() take into account
 O_NONBLOCK flag on pipes

On Mon, Mar 4, 2019 at 4:04 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Of course, if it turns out that this breaks something that assumes
> that splice blocks purely based on the SPLICE_F_NONBLOCK flag, we'll
> have to revert it. Looking at the history of splice, it does look like
> it has always ignored O_NONBLOCK.

Note that the "arguably buggy" argument is not an actual real argument
in the presence of regressions. It's more a "I wish reality wasn't
that way" argument, but it doesn't actually _change_ reality.

Of course, in the case of sendfile() (which is where that comment is),
I don't think we ever really even tested it either way.

                 Linus