From owner-freebsd-hackers@FreeBSD.ORG  Thu Nov 24 11:40:53 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id E4BC416A41F
	for <freebsd-hackers@freebsd.org>; Thu, 24 Nov 2005 11:40:53 +0000 (GMT)
	(envelope-from csaba@beastie.creo.hu)
Received: from beastie.creo.hu (www.creo.hu [217.113.62.14])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7675743D66
	for <freebsd-hackers@freebsd.org>; Thu, 24 Nov 2005 11:40:49 +0000 (GMT)
	(envelope-from csaba@beastie.creo.hu)
Received: from beastie.creo.hu (localhost [127.0.0.1])
	by beastie.creo.hu (8.13.3/8.13.3) with ESMTP id jAOBce76089500
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
	for <freebsd-hackers@freebsd.org>; Thu, 24 Nov 2005 12:38:40 +0100 (CET)
	(envelope-from csaba@beastie.creo.hu)
Received: (from csaba@localhost)
	by beastie.creo.hu (8.13.3/8.13.3/Submit) id jAOBceqL089499
	for freebsd-hackers@freebsd.org; Thu, 24 Nov 2005 12:38:40 +0100 (CET)
	(envelope-from csaba)
Date: Thu, 24 Nov 2005 12:38:40 +0100
From: Csaba Henk <csaba-ml@creo.hu>
To: freebsd-hackers@freebsd.org
Message-ID: <20051124113840.GK2911@beastie.creo.hu>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.9i
Subject: misteries of find(1)
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 24 Nov 2005 11:40:54 -0000

Hi!

With fuse based filesystems I experienced find(1) giving up after
running for a while, bursting out in a series of "File does not exist"
complaints. (On the contrary, gfind just ran peacefully.)

Why so?

Well, fuse is a synthetic filesystem, where files themselves are subject
to on demand creation / garbage collection (ie., not on the vnode
level, but on the "backing storage" level, which role is played by the
userspace filesystem daemon).

As the ENOENT complaints came when file gc hit in, I conjectured that
find somehow caches name-inode mappings (which becomes invalid if a file
gets gc'd: after that, if it's asked for, it will reappear with a new
inode number). I didn't look into find or libc source code, but that's
what I think.

Now with my CURRENT system (of 13th Nov) I don't see this happening
anymore, BSD find also runs fine. I wonder what has changed... find
itself doesn't seem to have any essential commits recently.

Does anyone has an idea?

Regards,
Csaba