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Date: Wed, 30 Nov 2016 11:30:11 -0800
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/6] xfs: fiemap support for cow fork
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To: Brian Foster <bfoster@redhat.com>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>, linux-xfs@vger.kernel.org

On Mon, Nov 28, 2016 at 02:31:19PM -0500, Brian Foster wrote:
> # xfs_io -c "bmap -c" /mnt/file 
> xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/file"]: Invalid
> argument
> 
> Is this under construction or expected to work as is?

You'll need a CONFIG_XFS_DEBUG build.