[Samba] Samba and BTRFS server-side copy

[Saint Germain]

Hello,

I would like to test Samba server-side copy with BTRFS:
https://wiki.samba.org/index.php/Server-Side_Copy#Btrfs_Enhanced_Server-Side_Copy_Offload

However it is not clear which server/client configuration I should use.

As far as I understand on the server-side, I should have at least Samba
4.1 on a BTRFS filesystem (with vfs objects = btrfs in the share).

But on the client side, what can I use ?

There is a warning on the page that:
"the client's FSCTL_SRV_COPYCHUNK server-side copy request must be
Btrfs filesystem aligned"

Digging a little more, I found some explanations here:
https://lists.samba.org/archive/samba-technical/2013-September/095135.html

> with Samba and Btrfs the request latency will be
> heavily effected by whether the FSCTL_SRV_COPYCHUNK wire request byte
> offsets and lengths align to the Btrfs sector-size (4K by default
> IIRC).
> If they do align, then each chunk in the request can be mapped to a
> BTRFS_IOC_CLONE_RANGE ioctl. Otherwise, we need to fall back to a
> server-side local read/write.
> 
> We should be able to provide underlying filesystem alignment
> requirements to SMB clients via the new FileFSSectorSizeInformation
> ioctl, but it's not currently supported by Samba.

So which client platform (Windows, Mac, Linux) and which client
software (smb, cifs, etc.) can I use to test this ?

Thanks in advance,