linux-kernel - Re: pipe

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Message-ID: <CA+55aFyPUYiFoiLrMCzeHpbAgAignCe_awU7SbvPh+T6eHeqng@mail.gmail.com>
Date:	Tue, 12 Mar 2013 08:31:50 -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 Tue, Mar 12, 2013 at 6:06 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> While we are at it, I don't see any reason for having separate file_operations
> for r/o, w/o and r/w cases; the only differences are in EBADF-returning
> ->read() and ->write() (and ->f_mode checks in vfs_read() et.al. take care of
> that) and micro-optimizations in ->release() and ->fasync().
>
> Frankly, I really wonder if we should simply use def_fifo_fops for ->i_fops
> in get_pipe_inode() and let open() via /proc/<pid>/fd/<n> act as it would for
> FIFOs, O_NONBLOCK and all.  IOW, how about we simply merge all those
> file_operations in one, folding fifo.c into pipe.c?  And to hell with any
> reassignments of ->f_op.
>
> I'm probably missing something subtle here...

Probably not missing anything subtle. I think all of this code is very
old, and related to previous /proc/<pid>/fd/<n> escapades. And the
semantics for those files were in flux some time long long ago (the
whole "dup vs new struct file" issue), it's all just duct-tape, I
think.

             Linus
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