From owner-freebsd-stable@FreeBSD.ORG  Thu Jan 22 13:28:35 2015
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 5CF679D
 for <freebsd-stable@freebsd.org>; Thu, 22 Jan 2015 13:28:35 +0000 (UTC)
Received: from smarthost1.greenhost.nl (smarthost1.greenhost.nl
 [195.190.28.81]) (using TLSv1 with cipher AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 203E3372
 for <freebsd-stable@freebsd.org>; Thu, 22 Jan 2015 13:28:34 +0000 (UTC)
Received: from smtp.greenhost.nl ([213.108.104.138])
 by smarthost1.greenhost.nl with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)
 (Exim 4.72) (envelope-from <ronald-lists@klop.ws>)
 id 1YEHnU-00057F-00
 for freebsd-stable@freebsd.org; Thu, 22 Jan 2015 14:28:31 +0100
Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes
To: freebsd-stable@freebsd.org
Date: Thu, 22 Jan 2015 14:27:42 +0100
Subject: mmap on tmpfs not updating mtime
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: "Ronald Klop" <ronald-lists@klop.ws>
Message-ID: <op.xsu80gb9kndu52@ronaldradial.radialsg.local>
User-Agent: Opera Mail/1.0 (Win32)
X-Authenticated-As-Hash: 398f5522cb258ce43cb679602f8cfe8b62a256d1
X-Virus-Scanned: by clamav at smarthost1.samage.net
X-Spam-Level: -
X-Spam-Score: -1.0
X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,
 BAYES_20 autolearn=disabled version=3.3.1
X-Scan-Signature: 9090f8a1960d7f777b94d17b6f36e747
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 22 Jan 2015 13:28:35 -0000

Hello,

Tested on 10.1-STABLE/amd64 and 11-CURRENT/arm.

I spotted this because rrdtool didn't update mtime of the database files  
so they were not backuped by my rsync scripts.

I remembered and found these mails from November 2014 about mtime+mmap on  
ZFS.
https://lists.freebsd.org/pipermail/freebsd-stable/2014-November/081138.html
which resulted in
https://lists.freebsd.org/pipermail/freebsd-stable/2014-December/081184.html

My tests with the test program in the November mails result in:
On 10.1-STABLE/ZFS its OK:
$ 14:18:08 ronald@sjakie [~/test]
ls -lT mdata; /tmp/a.out mdata; ls -lT mdata
-rw-------  1 ronald  staff  1024 Jan 22 14:18:08 2015 mdata
-rw-------  1 ronald  staff  1024 Jan 22 14:18:10 2015 mdata

On 11/UFS its OK:
$ 14:16:16 ronald@sheeva [~/test]
ls -lT mdata; /tmp/a.out mdata; ls -lT mdata
-rw-------  1 ronald  staff  1024 Jan 22 14:16:16 2015 mdata
-rw-------  1 ronald  staff  1024 Jan 22 14:16:21 2015 mdata

On 11/tmpfs it fails: (same on 10.1-STABLE/tmpfs)
$ 14:15:44 ronald@sheeva [/tmp]
ls -lT mdata; /tmp/a.out mdata; ls -lT mdata
-rw-------  1 ronald  wheel  1024 Jan 22 14:15:37 2015 mdata
-rw-------  1 ronald  wheel  1024 Jan 22 14:15:37 2015 mdata

Should a similar patch as ZFS got be applied to tmpfs?

Regards,
Ronald.