From owner-freebsd-stable@FreeBSD.ORG  Sun Nov 30 00:08:04 2014
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 1659EE08
 for <freebsd-stable@freebsd.org>; Sun, 30 Nov 2014 00:08:04 +0000 (UTC)
Received: from mail-pa0-x235.google.com (mail-pa0-x235.google.com
 [IPv6:2607:f8b0:400e:c03::235])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id D6BB58AF
 for <freebsd-stable@freebsd.org>; Sun, 30 Nov 2014 00:08:03 +0000 (UTC)
Received: by mail-pa0-f53.google.com with SMTP id kq14so8625640pab.26
 for <freebsd-stable@freebsd.org>; Sat, 29 Nov 2014 16:08:03 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=date:from:to:subject:message-id:in-reply-to:references:mime-version
 :content-type:content-transfer-encoding;
 bh=ivgbufDIoRy7XJL9egGIUJyNt5RRQeDU/1/3i3GykXM=;
 b=GGNWpQUAoc5S3BjJsnVV07c/4rGlqxldCLsenXcHFjokd7Bt5nWIV/tOVuy1Xr1RCO
 /sDm/wykZKCBzTb48UwLnVTgsDZArnrkTeM5sQzMLFaSBQIYUp745e+hZTzPvT60KHzJ
 IlqJaPCkPKSKDHcajy1Dl03lnRklg1nDmrigfBPGAqr1JVHH5flkIz3lRjfAHdLuLpOl
 6b5WAGz5tFNB5dw5mm4hpD4LCoZJ2c0b8+8y/2l5VqrQLw7jyPoFVQXRvybVaH3QlNnJ
 GA37yMPa8W6huSL+cocrbqGx8VGbwUMgkt9KvJZB3QOVCAr0OgssFTfGGf8ZQXY63CnD
 IWvw==
X-Received: by 10.70.100.199 with SMTP id fa7mr86891668pdb.114.1417306083501; 
 Sat, 29 Nov 2014 16:08:03 -0800 (PST)
Received: from splash.akips.com (CPE-120-146-191-2.static.qld.bigpond.net.au.
 [120.146.191.2])
 by mx.google.com with ESMTPSA id w4sm2863356pdq.28.2014.11.29.16.08.01
 for <freebsd-stable@freebsd.org>
 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
 Sat, 29 Nov 2014 16:08:02 -0800 (PST)
Date: Sun, 30 Nov 2014 10:07:20 +1000
From: Paul Koch <paul.koch137@gmail.com>
To: freebsd-stable@freebsd.org
Subject: Re: 10.1 mmap on zfs not updating mtime
Message-ID: <20141130100720.5b0bead7@splash.akips.com>
In-Reply-To: <20141125142302.1199041c@akips.com>
References: <20141125142302.1199041c@akips.com>
X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.22; amd64-portbld-freebsd10.1)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
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: Sun, 30 Nov 2014 00:08:04 -0000

Can probably ignore this.  We changed our application so it always calls
futimes() on the file descriptor after a fsync() or munmap().

	Paul.

On Tue, 25 Nov 2014 14:23:02 +1000
Paul Koch <paul.koch@akips.com> wrote:

> 
> Hi,
> 
> we have observed some odd behaviour with the mtime of a mmap'ed file
> when it has been updated on a zfs pool.  The mtime does not appear to
> be updated.  Seems to work ok on UFS.
> 
> Test program below...
> 
> On 10.0, the following works ok:
> 
>  dd bs=1k if=/dev/zero of=mdata count=1
>  ls -lT mdata; /tmp/mmap-mtime mdata; ls -lT mdata
> 
> but on 10.1 the mtime stays at its creation time.
> 
> 
> 
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <sys/mman.h>
> 
> #include <fcntl.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <string.h>
> #include <errno.h>
> 
> 
> int
> main (int argc, char **argv)
> {
>    int   fd,
>          i;
>    char *data,
>         *filename;
>    struct stat s;
> 
>    if (argc != 2)
>       exit (1);
> 
>    filename =argv[1];
> 
>    if (stat (filename, &s) != 0) {
>       fprintf (stderr, "stat: %s\n", strerror (errno));
>       exit (1);
>    }
>    else if ((fd = open (filename, O_RDWR, 0644)) == -1) {
>       fprintf (stderr, "open: %s\n", strerror (errno));
>       exit (1);
>    }
>    else if ((data = mmap (NULL, (size_t) s.st_size, 
>                           PROT_READ | PROT_WRITE, 
>                           MAP_SHARED,
>                           fd, (off_t) 0)) == MAP_FAILED) {
>       fprintf (stderr, "mmap: %s\n", strerror (errno));
>       exit (1);
>    }
> 
>    for (i = 0; i < s.st_size; i++) {
>       data[i] = 1;
>    }
> 
>    munmap (data, s.st_size);
>    close (fd);
> 
>    exit (0);
> }
> 
> 	Paul.