linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <20070608204836.5adaefa7@the-village.bc.nu>
Date:	Fri, 8 Jun 2007 20:48:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Ulrich Drepper <drepper@...hat.com>, Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

> So, what do you plan to do? Those handle won't be zero-based. Your 
> "working" system I immagine will do:
> 
> 	bleeh[handle - BASE].duh = ...;
> 
> How nice for a working system. If you *store* the handle returned by the 
> OS, and you *use* the handle to call for OS services, you will be fine 
> independently from the value handed out by the OS.

Well there are two ways I'd do this

#1: Throw the whole thing away and accept its not a good idea anyway

#2: If I was really going this way and I wanted to use it for serious
tricks for high performance I/O then I'd provide the handle from
userspace so that the strategy for allocation is controlled by the caller
who is the only one who can make the smart decisions
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