6147a6148,6188
>     #BEGIN addition
>     my $src_storage_plugin = PVE::Storage::Plugin->lookup($src_scfg->{type});
>     my $dst_storage_plugin = PVE::Storage::Plugin->lookup($dst_scfg->{type});
> 
>     # in many cases the storage may have a better idea how to convert:
>     # if src and dst format is the same
>     # and src_storeid is dst_storeid
>     # and the storage has the feature
>     # and the feature is implemented as volume_copy / volume_snapshot_copy
>     # let the storage do the work as it quite sure is faster
>     if ( $src_format eq $dst_format ) {
>         if( $src_storeid eq $dst_storeid ) {
>             # this is the same storage
>             # and storage is capable of materializing snaps
>             if( $snapname ) {
>                 my $canCopySnap = PVE::Storage::volume_has_feature($storecfg, 'copy', $src_volid, $snapname, undef) && $src_storage_plugin->can('volume_snapshot_copy');
>                 if( $canCopySnap ) {
>                     print "delegate to storage plugin volume_snapshot_copy (snap $snapname)\n";
>                     $src_storage_plugin->volume_snapshot_copy($src_scfg, $src_volname, $snapname, $dst_volname);
> 
>                     $src_storage_plugin->deactivate_volume($src_storeid, $src_scfg, $src_volname, $snapname);
> 
>                     return 1;
>                 }
>             }
> 
>             my $canCopyVolume = PVE::Storage::volume_has_feature($storecfg, 'copy', $src_volid, undef, undef) && $src_storage_plugin->can('volume_copy');
>             if ( $canCopyVolume ) {
>                 print "delegate to storage plugin: volume_copy (base)\n";
>                 $src_storage_plugin->volume_copy($src_scfg, $src_volname, $dst_volname);
> 
>                 $src_storage_plugin->deactivate_volume($src_storeid, $src_scfg, $src_volname, $snapname);
> 
>                 return 1;
>             }
>         }
>         # @todo: two zfs-storages might be able to receive stream from each other
>     }
>     #END addition
> 
> 
6173a6215,6219
> 
> 	# added: deactivate the src-volume, even on failure
> 	# this can be safely called as qemu_img_convert is never called on a running volume (that is not a snap)
> 	$src_storage_plugin->deactivate_volume($src_storeid, $src_scfg, $src_volname, $snapname);
>