Hello,

I found snapshot APIs(like virDomainSnapshotNum) invoked with VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA will return 0 even there are internal no-metadata snapshots in the domain.

Then I find the reason is in virDomainSnapshotObjListGetNames():

   937     /* If this common code is being used, we assume that all snapshots
   938     ┆* have metadata, and thus can handle METADATA up front as an
   939     ┆* all-or-none filter. XXX This might not always be true, if we
   940     ┆* add the ability to track qcow2 internal snapshots without the
   941     ┆* use of metadata. */
   942     if ((data.flags & VIR_DOMAIN_SNAPSHOT_FILTERS_METADATA) ==
   943     ┆   VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA)
   944     ┆   return 0;

So currently, with VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA, no snapshot will be returned.

I checked the commit. It is really old(6478ec1673a Eric Blake 2012-08-13 18:09:12 -0600) . I guess it was initially designed for the function to list internal snapshots without metadata.

However, now internal snapshot seems lower prioritized than external snapshot.

Do we have plan to design this function? Since the APIs invoked with this flag don't return the **right** result, if the function for VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA will not be designed, how will we deal with the flag? Remove it from code OR update the docs to mark it unsupported?

Best regards,

-----------------------------------

Han Han
Quality Engineer
Redhat.

Email: hhan@redhat.com
Phone: +861065339333