From owner-freebsd-fs@FreeBSD.ORG  Tue Oct  1 16:34:08 2013
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id DDBB6994
 for <freebsd-fs@freebsd.org>; Tue,  1 Oct 2013 16:34:08 +0000 (UTC)
 (envelope-from jkh@mail.turbofuzz.com)
Received: from mail.iXsystems.com (newknight.ixsystems.com [206.40.55.70])
 (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id C30E0281F
 for <freebsd-fs@freebsd.org>; Tue,  1 Oct 2013 16:34:08 +0000 (UTC)
Received: from localhost (mail.ixsystems.com [10.2.55.1])
 by mail.iXsystems.com (Postfix) with ESMTP id 12B85666F4
 for <freebsd-fs@freebsd.org>; Tue,  1 Oct 2013 09:34:08 -0700 (PDT)
Received: from mail.iXsystems.com ([10.2.55.1])
 by localhost (mail.ixsystems.com [10.2.55.1]) (maiad, port 10024) with ESMTP
 id 43796-04-5 for <freebsd-fs@freebsd.org>;
 Tue,  1 Oct 2013 09:34:07 -0700 (PDT)
Received: from [10.20.30.11] (63.sub-70-197-2.myvzw.com [70.197.2.63])
 (using TLSv1 with cipher AES128-SHA (128/128 bits))
 (No client certificate requested)
 by mail.iXsystems.com (Postfix) with ESMTPSA id 7213B666CF
 for <freebsd-fs@FreeBSD.org>; Tue,  1 Oct 2013 09:34:02 -0700 (PDT)
Content-Type: text/plain; charset=windows-1252
Mime-Version: 1.0 (Mac OS X Mail 7.0 \(1811\))
Subject: Re: zfs: the exponential file system from hell
From: Jordan Hubbard <jkh@mail.turbofuzz.com>
In-Reply-To: <20130930234401.GA68360@neutralgood.org>
Date: Tue, 1 Oct 2013 09:33:29 -0700
Content-Transfer-Encoding: quoted-printable
Message-Id: <BFAE1DDE-B8F8-40E5-9D9B-CF954D5D6457@mail.turbofuzz.com>
References: <52457A32.2090105@fsn.hu>
 <77F6465C-4E76-4EE9-88B5-238FFB4E0161@sarenet.es>
 <20130930234401.GA68360@neutralgood.org>
To: freebsd-fs@FreeBSD.org
X-Mailer: Apple Mail (2.1811)
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 01 Oct 2013 16:34:08 -0000


On Sep 30, 2013, at 4:44 PM, kpneal@pobox.com wrote:

> Bottom line:
> The replacement for the 'df' command when using ZFS is 'zfs list'.

Given that we have the sources to df, I guess we should consider the =
question begged:  Do we want to change it to DTRT for zfs filesystems?  =
There's no Unix Law=99 that says "df(1) must use the output of statfs(2) =
directly and can use no longer sources of information!"

At the end of the day, df(1) is just a convenient status reporting tool =
aimed at human consumption.  It could easily reach out to "zfs list" for =
the data it prints for zfs volumes if what's reported by statfs(2) just =
isn't suitable.

- Jordan