Re: Gvfs and Server-side SMB copy

[Saint Germain <saintger gmail com>]

On Fri, 4 Nov 2016 14:00:06 -0700, Jeremy Allison <jra samba org>
wrote :

> On Fri, Nov 04, 2016 at 09:00:21PM +0100, Saint Germain wrote:
> > On Fri, 4 Nov 2016 11:55:08 -0700, Jeremy Allison <jra samba org>
> > wrote :
> >
> > However the copy doesn't seem to be done server-side. And especially
> > the copy doesn't seem to be done instantaneously (like what we
> > should expect from a copy with BTRFS reflink).
> >
> > Perhaps I am misunderstanding something ?
> >
> > I thought that Gvfs would use my smbclient (v4.4.6) and
> > automatically send the FSCTL_SRV_COPYCHUNK which would be
> > interpreted as BTRFS_IOC_CLONE_RANGE by the samba server (v4.2.10).
> >
> > Connection manually through smbclient and issueing 'scopy'
> > instructions works (instantaneous copy) so the problem doesn't seem
> > to be on the server.
>
> You are misunderstanding how gvfs works. It doesn't invoke smbclient,
> but uses the libsmbclient library. This is a separate code base from
> smbclient.
>
> Both smbclient and libsmbclient call into an underlying library
> whose ABI we don't expose externally to Samba, called the cli_XXX
> functions.
>
> The internal interface - cli_splice() works and is called directly
> from smbclient via the 'scopy' command. That's why it works from
> smbclient.
>
> gvfs uses the libsmbclient interface, in which cli_splice is
> exposed as the SMBC_splice_ctx() call. gvfs doesn't currently
> call that interface from the gvfs_copy command, it needs to be
> updated to do so. That's what we're planning to do.

Thanks for the explanation, indeed I misunderstood.
So any software using libsmbclient should call SMBC_splice_ctx in order
to trigger the server-side copy ?

Which available software is currently calling this SMBC_splice_ctx ?
Is it also valid for Windows and Mac platform ?
I think that I have read somewhere that Windows and Mac could trigger
this server-side copy, but I am not sure.

Thanks again !