Re: Reading about CoW architecture / Performance Limits

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On Wed, Jan 11, 2017 at 12:05:44AM -0800, Darrick J. Wong wrote:
> > 3. There appears to be code that allows retroactively creating CoW for
> > two files that existed separately before. Is that (planned to be)
> > exposed to userland?
> 
> No plans for that at the moment.  There used to be a debugging knob, but
> it was ripped out before upstreaming the code.

I think he's asking for the dedup ioctl, which is supported.
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