From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: autofs: make the autofsv5 packet file descriptor use a packetized
 pipe
Date: Sun, 29 Apr 2012 17:35:19 -0700
Message-ID: <4F9DDE47.5060008@zytor.com>
References: <20120429205429.63CCD7C0064@ra.kernel.org> <4F9DD994.70202@zytor.com> <CA+55aFy72rPMq3M2_PU0ue45Fb38_Effrfhu2uOpdVXt9H1XOg@mail.gmail.com> <4F9DDCB6.1070908@zytor.com> <CA+55aFwGZm4+rdJ+xArhsVJ8P5gH3xxCfuoHibotr0Sik484=w@mail.gmail.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Michael Tokarev <mjt@tls.msk.ru>, Alan Cox <alan@lxorguk.ukuu.org.uk>, Ian Kent <raven@themaw.net>, Thomas Meyer <thomas@m3y3r.de>, autofs@vger.kernel.org

On 04/29/2012 05:33 PM, Linus Torvalds wrote:
> 
> The problem is only if it starts out by reading just the header of the
> packet, and then reads the rest of the packet as a second read. *THAT*
> won't work with the packetized pipe approach, because reading the
> header of the packet will then discard the rest of it, and the second
> read would try to read the *next* packet (which under many normal
> loads won't even exist, of course).
> 

Which is funny/sad, because that's actually the intended way the
interface is meant to work.

	-hpa