On Fri, Oct 16, 2015 at 07:46:41AM -0400, Austin S Hemmelgarn wrote:
> I should have been specific, what I meant was that some people will assume
> that it actually creates a physical, on-disk byte-for-byte copy of the data.
> There are many people out there (and sadly I have to deal with some at work)
> who are absolutely terrified of the concept of data deduplication, and will
> likely refuse to use this syscall for _anything_ if it reflinks by default
> on filesystems that support it.

If they use a file system that supports COW or dedup they are toast
already.  It's not the system call that does the 'dedup', it's the file
system or storage device, that's where they need to set their
preferences.
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