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

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Message-ID: <CA+55aFz_C4nVX580nvvAngsB3U9oMnCGPDs8Yo1Qpx=XagcpMA@mail.gmail.com>
Date:	Mon, 3 Nov 2014 09:05:51 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Rannaud <e@...ocritical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [RFC PATCH] fs: allow open(dir, O_TMPFILE|..., 0) with mode 0

On Mon, Nov 3, 2014 at 12:34 AM, Christoph Hellwig <hch@...radead.org> wrote:
>
> That doesn't help because we explicitly reject O_RDONLY when combined
> with O_TMPFILE.

You obviously cannot actually have a read-only file descriptor with
O_TMPFILE, unless all you care about is a zero-sized file with no
contents.

That's why people are talking about things like downgrading the file
*after* filling it, using sealing.

                  Linus
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