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Date: Wed, 14 Oct 2015 22:40:41 +0800
From: Anand Jain <anand.jain@oracle.com>
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To: Dmitry Katsubo <dmitry.katsubo@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: Recover btrfs volume which can only be mounded in read-only mode
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> # mount -o degraded /var
> Oct 11 18:20:15 kernel: BTRFS: too many missing devices, writeable
> mount is not allowed
>
> # mount -o degraded,ro /var
> # btrfs device add /dev/sdd1 /var
> ERROR: error adding the device '/dev/sdd1' - Read-only file system
>
> Now I am stuck: I cannot add device to the volume to satisfy raid pre-requisite.

  This is a known issue. Would you be able to test below set of patches
  and update us..

    [PATCH 0/5] Btrfs: Per-chunk degradable check

Thanks, Anand