From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f173.google.com ([209.85.223.173]:36018 "EHLO mail-ie0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752656AbbEFRcG (ORCPT ); Wed, 6 May 2015 13:32:06 -0400 Received: by iecnq11 with SMTP id nq11so19910114iec.3 for ; Wed, 06 May 2015 10:32:06 -0700 (PDT) Message-ID: <554A5012.1090801@gmail.com> Date: Wed, 06 May 2015 13:32:02 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: Chris Murphy CC: Qu Wenruo , Btrfs BTRFS Subject: Re: btrfs-progs 4.0 breaks btrfs fi show? References: <5549CCD8.2010000@cn.fujitsu.com> <5549DF66.5090900@cn.fujitsu.com> In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms050203030109050006090504" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms050203030109050006090504 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-05-06 13:05, Chris Murphy wrote: > Ok so now that my mea culpa is out of the way, I'm actually wondering > why non-root users can't do certain btrfs tasks when they're read-only > commands. > > [chris@f22m ~]$ btrfs fi show > ERROR: could not open /dev/sda7 ##this is new it wasn't doing this la= st night > btrfs-progs v4.0 > [chris@f22m ~]$ btrfs fi df / > Data, single: total=3D4.00GiB, used=3D3.57GiB > System, single: total=3D4.00MiB, used=3D16.00KiB > Metadata, single: total=3D1.01GiB, used=3D198.30MiB > GlobalReserve, single: total=3D80.00MiB, used=3D0.00B > [chris@f22m ~]$ btrfs fi usage / > WARNING: can't read detailed chunk info, RAID5/6 numbers will be > incorrect, run as root > WARNING: can't get filesystem info from ioctl(FS_INFO), run as root > ERROR: couldn't get space info on '/' - Operation not permitted > > > I think usage is more useful than df for users, and contains largely > the same information as df + show, so I think all three should be > non-root user usable. > That may be tricky to do, I think show and usage both access the=20 underlying block device directly (or try to in any case), which would=20 explain why they don't work as non-root; 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