From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Date: Sat, 6 Oct 2018 03:41:34 -0700
Subject: [Ocfs2-devel] [PATCH 08/15] vfs: change clone and dedupe range
 function pointers to return bytes completed
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To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: david@fromorbit.com, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, ocfs2-devel@oss.oracle.com, sandeen@redhat.com

On Thu, Oct 04, 2018 at 05:45:35PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Change the clone_file_range and dedupe_file_range functions to return
> the number of bytes they operated on.  This is the precursor to allowing
> fs implementations to return short clone/dedupe results to the user,
> which will enable us to obey resource limits in a graceful manner.

For clone this doesn't make any sense, as we don't allow 'short clones'.