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To: linux-btrfs@vger.kernel.org
From: Konstantin Svist <fry.kun@gmail.com>
Subject: btrfs-progs confusing message
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Date: Wed, 20 Apr 2016 13:23:54 -0700
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Pretty much all commands print out the usage message when no device is
specified:

[root@host ~]# btrfs scrub start
btrfs scrub start: too few arguments
usage: btrfs scrub start [-BdqrRf] [-c ioprio_class -n ioprio_classdata]
<path>|<device>
...

However, balance doesn't

[root@host ~]# btrfs balance start
ERROR: can't access 'start': No such file or directory