reflink support and Samba running over XFS

[Amir Goldstein]

On Tue, Nov 8, 2022 at 7:53 PM Jeremy Allison via samba-technical
<samba-technical at lists.samba.org> wrote:
>
> On Mon, Nov 07, 2022 at 10:47:48PM -0800, Christoph Hellwig wrote:
> >On Mon, Nov 07, 2022 at 04:53:42PM -0800, Jeremy Allison via samba-technical wrote:
> >> ret = ioctl(fsp_get_io_fd(dest_fsp), BTRFS_IOC_CLONE_RANGE, &cr_args);
> >>
> >> what ioctls are used for this in XFS ?
> >>
> >> We'd need a VFS module that implements them for XFS.
> >
> >That ioctl is now implemented in the Linux VFS and supported by btrfs,
> >ocfs2, xfs, nfs (v4.2), cifs and overlayfs.
>
> I'm assuming it's this:
>
> https://man7.org/linux/man-pages/man2/ioctl_ficlonerange.2.html
>
> Yeah ? I'll write some test code and see if I can get it
> into the vfs_default code.
>

Looks like this was already discussed during the work on generic
implementation of FSCTL_SRV_COPYCHUNK:
https://bugzilla.samba.org/show_bug.cgi?id=12033#c3

Forgotten?
Left for later?

Thanks,
Amir.