On 2017-08-22 09:30, Ulli Horlacher wrote:

On Tue 2017-08-22 (09:27), Austin S. Hemmelgarn wrote:

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root@fex:~# df -T
Filesystem     Type  1K-blocks      Used Available Use% Mounted on
-              -    1073740800 104244552 967773976  10% /local/.backup/home

     I've never seen the "- -" output from df before. Is this a bind
mount or something?

No, /local/.backup/home is just a btrfs subvolume

It arguably shouldn't be showing up here then if it's not been
explicitly mounted.  I'm betting you're running OpenSUSE or SLES

No:

root@fex:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="14.04.5 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.5 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

root@fex:~# df -T /local/.backup/home
Filesystem     Type  1K-blocks      Used Available Use% Mounted on
-              -    1073740800 104252160 967766336  10% /local/.backup/home

root@fex:~# type df
df is hashed (/bin/df)

root@fex:~# dpkg -S /bin/df
coreutils: /bin/df

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.