Newbie question about metadata_list.

[Łukasz Szymczyk <lukasz.szymczyk@xxxxxxxxxxxx>]

Hi,

I'm writing some program to replace image in cluster with it's copy.
But I have problem with metadata_list.
I created pool:
#rados mkpool dupa
then I created image:
#rbd create --size 1000 -p mypool image --image-format 2

Below is code which tries to get metadata, but it fails with -EOPNOTSUPP.
I compile it with command like this:
g++ file.cpp -lrbd -lrados -I/ceph/source/directory/src

#include <stdio.h>
#include <stdlib.h>
#include "include/rbd/librbd.h"
#include "include/rbd/librbd.hpp"
using namespace ceph;
#include "librbd/ImageCtx.h"

int main() {
	rados_t clu;
	int ret = rados_create(&clu, NULL);
	if (ret) return -1;

	ret = rados_conf_read_file(clu, NULL);
	if (ret) return -1;

	rados_conf_parse_env(clu, NULL);
	ret = rados_connect(clu);
	if (ret) return -1;

	rados_ioctx_t io;
	ret = rados_ioctx_create(clu, "mypool", &io);
	if (ret) return -1;

	rbd_image_t im;
	ret = rbd_open(io, "image", &im, NULL);
	if (ret) return -1;

	librbd::ImageCtx *ic = (librbd::ImageCtx*)im;
	std::string start;
	int max = 1000;
	bufferlist in, out;
	::encode(start, in);
	::encode(max, in);
	ret = ((librados::IoCtx*)&io)->exec(ic->header_oid, "rbd", "metadata_list", in, out);
	if (ret < 0) printf("fail\n");

	return 0;

}

So, my question is: what should be set/enabled to get those metadata?
Or maybe what I'm doing wrong here.
Thanks for your help.

Best regards,
Łukasz
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