So here's a thing...
If you've got a BTRFS root file system and you mount go to resize a
removable media and you make a typo you can easily resize your root
instead of a target.
mkdir /media/vol1 /media/vol2
mount /dev/sdz1 /media/vol2 # intended vol1
btrfs resize -32G /media/vol1
umount /dev/sdz1
#proceed to fark up /dev/sdz1 with partitioning tools
Since resize will accept _any_ existing directory (or even filename?) as
the target of a resize instead of limiting the targets to known
mount-points it pretty much invites mistakes.
The system _should_ error out on any path thats not a mount point in the
name of safety alone.
A message like "/some/path not a mounted file system" would be less
surprising than operating on a file system when any arbitrary directory
is named.
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