Re: [PATCH v5 8/9] vfs: Add vfs_copy_file_range() support for pagecache copies

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On Wed, Oct 14, 2015 at 11:49 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Wed, Oct 14, 2015 at 11:38:13AM -0700, Andy Lutomirski wrote:
>> One might argue that reflink is like copy + immediate dedupe.
>
> Not, it's not.  It's all that and more, because it is an operation that
> is atomic vs other writes to the file and it's an operation that either
> clones the whole range or nothing.  That's a very important difference.

Fair enough.

Would copy_file_range without the reflink option removed still be
permitted to link blocks on supported filesystems (btrfs and maybe
XFS)?

--Andy
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