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

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Message-ID: <CA+55aFzEefQWk+0EB2+dcL8DZcn+B7=1HZ1MV0HVMX7prhrmVA@mail.gmail.com>
Date:	Sun, 29 Apr 2012 18:56:26 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ian Kent <raven@...maw.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Tokarev <mjt@....msk.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Thomas Meyer <thomas@...3r.de>, autofs@...r.kernel.org
Subject: Re: autofs: make the autofsv5 packet file descriptor use a packetized pipe

On Sun, Apr 29, 2012 at 6:29 PM, Ian Kent <raven@...maw.net> wrote:
>
> autodir looks ok as well.
>
> http://sourceforge.net/projects/intraperson/files/latest/download

That looks odd, but safe.

Why does the code make the pipe file descriptor non-blocking, when it
then always reads it using that odd "poll_read()" function that does a
loop with poll() and read(). I guess there is some 1-second timeout
thing.

It's a bit odd in other ways too. The "handle_events()" function is
passed the fd, but then it never actually uses it, and uses
'autodir.k_pipe' instead.

So I'm having a bit of trouble following the *logic* to any of that,
but the only reads I found did seem to match the "read whole packet"
model, so it does look ok too.

                     Linus
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