smb2:ioctl: support for OS X AAPL copyfile style copy_chunk
Apple's special copy_chunk ioctl that requests a copy of the whole file
along with all attached metadata.
These copy_chunk requests have a chunk count of 0 that we translate to a
copy_chunk_send VFS call overloading the parameters src_off = dest_off =
num = 0.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11317
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit
58480da5066bd33bc73aeb72bd17bd4797c22110)