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

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Date:	Sun, 10 Jun 2007 06:46:28 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dean gaudet <dean@...tic.org>, Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Sat, Jun 09, 2007 at 10:06:27PM -0700, Linus Torvalds wrote:
> Why the hell doesn't that thing just do an "fstat()" on the thing, and 
> compare the inode number? Not that I would guarantee that it works either 
> for a socket, but it would seem to make more sense than what it apparently 
> does now, and I think it should work at least on Linux.

It works on Linux, all right.

> (Ie linux will give fake "st_ino" numbers to sockets. Whether anybody else 
> will do that, I have no friggin clue. And you probably shouldn't depend on 
> it even under Linux, but damn, despite all of those issues, it's likely 
> better and more logical than what libnss-ldap apparently does now ;)

On FreeBSD it will simply give you zero st_ino on almost all sockets;
AF_UNIX ones get st_ino invented (and stable).  st_dev is NODEV in all
cases...
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