* Florian Weimer:

> * Vít Novotný:
> > with the increasing support for copy-on-write (i.e. reflink) in modern
> > filesystems, it seems reasonable for head(1) and tail(1) to try calling
> > ioctl_ficlonerange(2) where available before copying.
> How does this relate to the availability of copy_file_range?

Both system calls first appeared in Linux 4.5, but they both serve a
different purpose:

- copy_file_range enables fast in-kernel copying.
- ioctl_ficlonerange enables CoW sharing of data between files.

Best Regards,

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