linux-kernel - Re: [patch] pipe: add support for shrinking and growing pipes

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Message-ID: <alpine.LFD.2.00.1005190946540.23538@i5.linux-foundation.org>
Date:	Wed, 19 May 2010 09:49:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com, akpm@...ux-foundation.org
Subject: Re: [patch] pipe: add support for shrinking and growing pipes



On Wed, 19 May 2010, Miklos Szeredi wrote:
> 
> One issue I see is that it's possible to grow pipes indefinitely.
> Should this be restricted to privileged users?

Yes. But perhaps only if it grows past the default (or perhaps "default*2" 
or similar). That way a normal user could shrink the pipe buffers, and 
then grow them again if he wants to.

Oh, and I think you need to also require that there be at least two 
buffers. Otherwise we can't guarantee POSIX behavior, I think.

		Linus
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