linux-kernel - Re: pipe

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Message-ID: <CA+55aFx+TAg+z9eWVm3EeAHQga3ai6YRFEb7rVQ++iNTn4NhGQ@mail.gmail.com>
Date:	Mon, 11 Mar 2013 08:10:10 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: pipe_release oops.

On Sun, Mar 10, 2013 at 5:35 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Hmm...  How the devil would things like pipe_read_open() get called, anyway?
> pipe_rdwr_open() can be called, all right - that happens if you do pipe()
> and then open() via /proc/self/fd/<n>.  But how could pipe_read_open() and
> pipe_write_open() be called?  They are accessible only as ->open() of
> read_pipefifo_fops/write_pipefifo_fops.  And those are only used by
> fifo_open(), which does reassign file->f_op to them, but does *not* call
> their ->open()...

.. same deal? Open the resulting fd from /proc/self/fd/<n> afterwards,
which will call file->f_op->open(), no?

                 Linus
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