T12641: Refactor KFileProtocol::copy

[Méven Car]

meven added a comment.


  copy https://github.com/coreutils/coreutils/blob/master/src/copy.c#L301 use https://man7.org/linux/man-pages/man2/copy_file_range.2.html or https://github.com/coreutils/gnulib/blob/master/lib/full-write.h
  Did not know about copy_file_range, it was introduced in kernel 4.5 and improved/reworked in 5.3 apparently.
  It is simply newer than sendfile (but older than io_uring), it seems to be just almost a drop-in replacement for sendfile with reflink aka COW support for supporting fs built-in.
  That should be the next area for investigation, it is way simpler than our current reflink support, but it is Linux only.

TASK DETAIL
  https://phabricator.kde.org/T12641

To: meven
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