Ceph » rgw

It seems like the place to do this is in RGWRados::cls_bucket_list_unordered. Ideally cls_rgw_bucket_list_op has a result of -ENOENT when a bucket index shard is missing....

Here's the code:

while (count <= num_entries &&
     ((shard_id >= 0 && current_shard == uint32_t(shard_id)) ||
      current_shard < num_shards)) {
    const std::string& oid = oids[current_shard];
    rgw_cls_list_ret result;

librados::ObjectReadOperation op;
    cls_rgw_bucket_list_op(op, marker, prefix, num_entries,
                           list_versions, &result);
    r = index_ctx.operate(oid, &op, nullptr);
    if (r < 0)
      return r;