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Date: Wed, 01 Apr 2015 15:06:39 +0800
From: Anand Jain <Anand.Jain@oracle.com>
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To: Martin <m_btrfs@ml1.co.uk>, linux-btrfs@vger.kernel.org
Subject: Re: ERROR: error removing the device '/dev/sdXN' - Inappropriate
 ioctl for device
References: <mfcdep$d97$1@ger.gmane.org> <20150331173756.GF6821@twin.jikos.cz> <mfeo14$sib$1@ger.gmane.org>
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>>> btrfs device delete /dev/sdf5 /mnt/data2
>>>
>>> ERROR: error removing the device '/dev/sdf5' - Inappropriate ioctl for
>>> device

  very strange. 'btrfs fi show -m' shows btrfs fs(s) that are mounted.

- Anand