linux-kernel - Re: autofs: make the autofsv5 packet file descriptor use a packetized pipe

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Message-ID: <4F9DDE47.5060008@zytor.com>
Date:	Sun, 29 Apr 2012 17:35:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Tokarev <mjt@....msk.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ian Kent <raven@...maw.net>, Thomas Meyer <thomas@...3r.de>,
	autofs@...r.kernel.org
Subject: Re: autofs: make the autofsv5 packet file descriptor use a packetized
 pipe

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


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