bug#21011: df utility bug

[erbenton]

Hi,
The -x option of 'df' doesnt seem to work, when I exclude type sysfs it still includes it. I was trying to get around this annoying error using the -x option.
e.g:
> df
df: ‘/sys/kernel/debug/tracing’: Permission denied
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs         4021028       16   4021012   1% /dev
tmpfs            4034396      608   4033788   1% /dev/shm
tmpfs            4034396     5488   4028908   1% /run
/dev/sda3      237244096 37634248 187535508  17% /
tmpfs            4034396        0   4034396   0% /sys/fs/cgroup
tmpfs            4034396     5488   4028908   1% /var/run
tmpfs            4034396     5488   4028908   1% /var/lock
/dev/sda1         488613    85005    373861  19% /boot

So, i used this to find the "type"
> df -T /sys
Filesystem     Type  1K-blocks  Used Available Use% Mounted on
sysfs          sysfs         0     0         0    - /sys

and this to try and exclude sysfs:

> df -x sysfs
df: ‘/sys/kernel/debug/tracing’: Permission denied
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs         4021028       16   4021012   1% /dev
tmpfs            4034396      608   4033788   1% /dev/shm
tmpfs            4034396     5488   4028908   1% /run
/dev/sda3      237244096 37634244 187535512  17% /
tmpfs            4034396        0   4034396   0% /sys/fs/cgroup
tmpfs            4034396     5488   4028908   1% /var/run
tmpfs            4034396     5488   4028908   1% /var/lock
/dev/sda1         488613    85005    373861  19% /b

But it doesnt work, it still includes sysfs

-- 
Eric Benton
Olympia WA
KG7RYU
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