[Samba] Samba and BTRFS server-side copy

Saint Germain saintger at gmail.com
Thu Oct 27 21:27:29 UTC 2016


I would like to test Samba server-side copy with BTRFS:

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:

> 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,

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