linux-kernel - Re: [RFC PATCH] fs: allow open(dir, O

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Date:	Thu, 30 Oct 2014 15:58:18 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Eric Rannaud <e@...ocritical.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] fs: allow open(dir, O_TMPFILE|..., 0) with mode 0

On Thu, Oct 30, 2014 at 3:48 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Agreed. Will apply and add the stable cc.

Ho humm. Thinking about this some more, I'm starting to wonder. Not
about this patch per se (open on a newly created file should indeed
succeed regardless), but about the horrible glibc behavior of screwing
up the third argument.

If you want to do O_TMPFILE + linkat() (or some eventual future
flink()), the mode really matters. So this idiotic glibc behavior of
only forwarding the third argument if O_CREAT is set seems to be a
bug.

Why the hell does glibc think it's a good idea to intersect system
call semantics? It's not a good idea - it's just stupid in the
extreme. And in this case it seems to actively breaks things.

                     Linus
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