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From: Martin Steigerwald <martin@lichtvoll.de>
To: linux-btrfs@vger.kernel.org
Subject: Unclear error message when running btrfs check on a mountpoint
Date: Sat, 31 Oct 2015 12:14:07 +0100
Message-ID: <1773354.pT4juS7CCv@merkaba>
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Hi!

With kernel 4.3-rc7 and btrfs-progs 4.2.2 I get:

merkaba:~> btrfs check /daten
Superblock bytenr is larger than device size
Couldn't open file system


It took me a moment to see that I used a mountpoint and that this may be the
reason for the error message.

Maybe check for a device file as argument and give a clearer error message
in this case?

Thanks,
-- 
Martin