Message-ID: <45E32AFD.2050407@zytor.com>
Date: Mon, 26 Feb 2007 10:46:21 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Alan <alan@lxorguk.ukuu.org.uk>
CC: Zach Brown <zab@zabbo.net>, Pekka Enberg <penberg@cs.helsinki.fi>,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, hch@lst.de
Subject: Re: [RFC/PATCH] revokeat/frevoke system calls V5
References: <Pine.LNX.4.64.0701282200450.17167@sbz-30.cs.Helsinki.FI>	<20070226003307.6f38d2ee@lxorguk.ukuu.org.uk>	<84144f020702252325j29da2819i50c99477cce89359@mail.gmail.com>	<45E291F7.6060508@zytor.com>	<79B7BBDC-E953-4EAE-8D32-E510DE0981FF@zabbo.net> <20070226194131.2c4e4a47@lxorguk.ukuu.org.uk>
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Alan wrote:
>> I'm not sure.  Turning, for example, the statat(dir_fd, name == NULL)  
>> error case into fstat(dir_fd) sounds like a way for apps, admittedly  
>> buggy ones, to be surprised.  Maybe libc would be exptected to catch  
>> the error before performing the shared system call?
> 
> At that point would it not be cheaper to have two system calls, the table
> cost isn't very large.

It's not just the table, though, you need two entry points, but even 
that isn't really all that big either, I guess.

	-hpa
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