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Date: Sun, 02 Nov 2014 14:31:36 -0800
From: Robert White <rwhite@pobox.com>
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To: Florian Lindner <mailinglists@xgm.de>, linux-btrfs@vger.kernel.org
Subject: Re: Can't mount: open_ctree failed!
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On 11/02/2014 07:18 AM, Florian Lindner wrote:
> # btrfsck /dev/sdb1
> # btrfsck --init-extent-tree /dev/sdb1
> # btrfsck --init-csum-tree /dev/sdb1

Notably missing from all these commands is "--repair"...

I don't know that's your problem for sure, but it's where I would start...