[PATCH][SMB3] Add defines for various newer FSCTLs

[David Disseldorp]

Patch looks fine to me:
Reviewed-by: David Disseldorp <ddiss at suse.de>

On Sun, 22 May 2022 19:09:34 -0500, Steve French via samba-technical wrote:

>  #define FSCTL_DUPLICATE_EXTENTS_TO_FILE 0x00098344
> +#define FSCTL_DUPLICATE_EXTENTS_TO_FILE_EX 0x000983E8

This one looks interesting - I wonder what kind of client use it gets.
FICLONERANGE / BTRFS_IOC_CLONE_RANGE is atomic, so it should be possible
to extend Samba's current dup-extents support to handle the new flag
(DUPLICATE_EXTENTS_DATA_EX_SOURCE_ATOMIC) without needing any lower
level changes.

Cheers, David