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In order to fully utilize xarray tagging to improve writeback we need to convert the buffer_radix to a proper xarray. This conversion is relatively straightforward as the radix code uses the xarray underneath. Using xarray directly allows for quite a lot less code. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>