Re: workaround for buggy GNU df

[Andrei Borzenkov <arvidjaar@gmail.com>]

On 25.06.2024 22:12, Remi Gauvin wrote:
> On 2024-06-25 2:13 p.m., Phillip Susi wrote:
>>> The GNU tool df does not work correctly on btrfs, example:
>>>
>>> root@fex:/test/test/test# df -T phoon.png
>>> Filesystem     Type 1K-blocks     Used Available Use% Mounted on
>>> -              -     67107840 16458828  47946692  26% /test/test
>>>
>>> root@fex:/test/test/test# grep /test /proc/mounts || echo nope
>>> nope
>>>
>>> The mountpoint is wrong, the kernel knows the truth.
>> How did you get this to happen?
>>
> 
> Very easy to replicate.  If you call df with a path, it prints the
> location of the subvolume in the "Mounted As" column.  No other steps
> necessary.
> 
> 

bor@tw:~> df -T /home
Filesystem     Type  1K-blocks     Used Available Use% Mounted on
/dev/sda2      btrfs  39835648 20799988  16982220  56% /home
bor@tw:~> df -T /home/bor
Filesystem     Type  1K-blocks     Used Available Use% Mounted on
/dev/sda2      btrfs  39835648 20799988  16982220  56% /home
bor@tw:~> df -T /home/bor/bin
Filesystem     Type  1K-blocks     Used Available Use% Mounted on
/dev/sda2      btrfs  39835648 20799988  16982220  56% /home
bor@tw:~>