Comment # 4 on bug 1203027 from Ancor Gonzalez Sosa

(In reply to Richard Brown from comment #3)
> 
> Users should be able to define subvolumes just the same way the installer
> already does.

Actually they can. The current limitations are shared by the users and by the
installer. As documented here[1] a subvolume in the control file is also
limited to defining "path", "copy_on_write" and "archs".

With the current implementation of libstorage-ng, the mount point of a
subvolume is always auto-calculated from the mount point of the file-system and
the path of the subvolume.

That's one of the several things that would need to be changed in order to
unleash all the potential for subvolume configuration.

[1]
https://github.com/yast/yast-installation/blob/master/doc/control-file.md#the-volumes-subsection