[PATCH 0/1] cloner: add support for clone_file_range for cifs

[Ronnie Sahlberg <lsahlber@redhat.com>]

This is a trivial patch that adds support for copy_file_range for cifs.
This uses the copy_file_range interface which cifs.ko supports.

Note that cloner.c uses an ioctl() for copying an entire file. This is
an older interface from before cifs.ko added proper copy_file_range
support but both interfaces eventually end up in the same codepaths
and use the same SMB2 commands on the wire.
Could argue that we could/should use copy_file_range() for the whole file
case as well but there is no harm leaving it as-is using the older interface.