Re: finding root filesystem of a subvolume?

["Austin S. Hemmelgarn" <ahferroin7@gmail.com>]

On 2017-08-22 09:53, Ulli Horlacher wrote:
> On Tue 2017-08-22 (09:37), Austin S. Hemmelgarn wrote:
> 
>>> root@fex:~# df -T /local/.backup/home
>>> Filesystem     Type  1K-blocks      Used Available Use% Mounted on
>>> -              -    1073740800 104252160 967766336  10% /local/.backup/home
>>
>> Hmm, now I'm really confused, I just checked on the Ubuntu 17.04 and
>> 16.04.3 VM's I have (I only run current and the most recent LTS
>> version), and neither of them behave like this.
> 
> I have this kind of output on all of my Ubuntu hosts:
> 
> root@moep:~# grep PRETTY_NAME /etc/os-release
> PRETTY_NAME="Ubuntu 16.04.3 LTS"
> 
> root@moep:~# df -T /usb/UF/tmp/blubb
> Filesystem     Type 1K-blocks    Used Available Use% Mounted on
> -              -     12581888 3690524   7253700  34% /usb/UF/tmp/blubb
> 
> root@moep:~# btrfs subvolume show /usb/UF/tmp/blubb
> /usb/UF/tmp/blubb
>          Name:                   blubb
>          UUID:                   ecf8c804-d4a3-9948-89fe-b0c1971c25cb
>          Parent UUID:            -
>          Received UUID:          -
>          Creation time:          2017-08-22 12:54:16 +0200
>          Subvolume ID:           262
>          Generation:             23
>          Gen at creation:        22
>          Parent ID:              5
>          Top level ID:           5
>          Flags:                  -
>          Snapshot(s):
> 
> root@moep:~# dpkg -l | grep btrfs
> ii  btrfs-tools                                 4.4-1ubuntu1                                 amd64        Checksumming Copy on Write Filesystem utilities
> 
Hmm, interesting.  Are you using qgroups by chance?