[sles-beta] btrfs & tooling

Wed May 28 06:00:41 MDT 2014

Hi Richard,

Honestly it'll be a mess to dismiss "df" for a lot of people, especially 
the guys coming from any UNIX.

As i mentioned: on my beta7 install the commands you issued do not work 
well or hard to read:

For example btrfs fi df shows a lot of information and it's hard to filter 
at a glance.

btrfs qgroup show does not work for me at all....what's the quota? have a 
guess!

# btrfs qgroup show /tmp
qgroupid rfer       excl 
-------- ----       ---- 
0/5      16384      16384 
0/257    2359185408 2359185408 
0/258    16384      16384 
0/259    102576128  102576128 
0/260    16384      16384 
0/261    16384      16384 
0/262    16384      16384 
0/263    97067008   97067008 

Dipl.-Inf. Christoph Schumacher
FAI5 Competence Center Dezentrale Server
Dr. Ing. h.c. F. Porsche AG
Porscheplatz 1, D-70435 Stuttgart Zuffenhausen
Telefon:  +49 (0)711/911-23729
Fax:      +49 (0)711/911-23171
E-Mail:   christoph.schumacher at porsche.de

From:   Richard Brown <rbrown at suse.de>
To:     sles-beta at lists.suse.com
Date:   28/05/2014 13:53
Subject:        Re: [sles-beta] btrfs & tooling
Sent by:        sles-beta-bounces at lists.suse.com

Hello Christoph,

I'm afraid I can't answer all your questions, but I'll take a stab at a
few that I believe I know the answer to

On Wed, 2014-05-28 at 13:39 +0200, Christoph Schumacher wrote:
> - on subvolume with limits/quota df always shows the size of the
> parent volume also for all subvolumes 
> IMHO it should either show the limited size or not show the subvolume
> at all because it's only disturbing 

> - also after "mirroring" a btrfs with a raid1 df shows the sum of both
> volumes in the btrfs despite the real size 

Because of the nature of how btrfs works, df isn't the best tool to use

btrfs has it's own tools for the purpose, such as 'btrfs fi show' which
shows you the raw disk usage, and 'btrfs fi df <filepath>' which will
show you the equivalent of df, taking into account things like btrfs
RAID, for the subvolume selected by <filepath>

> - i can't figure out how to show the quota of a btrfs volume easily
> and clearly ..... what the common known btrfs-tools show is cr....not
> good. 

'btrfs qgroup show <filepath>' where <filepath> is a location for your
btrfs volume/subvolume, should give you the information you require.

Hope this helps,

- Rich

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