ldd_fsname, ldd_svindex, and ldd_flags (LDD_F_SV_TYPE_XXX) contain duplicate data with ldd_svname. The duplication should be removed, at least from the new ZFS OSD LDD, to avoid confusion. I'm not sure how difficult it will be for LDiskFS OSD, but for ZFS OSD, this should be straightforward before ZFS is officially supported.