Store additional metadata about RBD Image owner(PVC name) in RBD Image

[krmayankk]

implement the following proposal for csi-rbd and in core kubernetes for rbd provisioner

https://github.com/kubernetes/community/pull/1790/files

I wrote this proposal and was interested in working on this , but since we are no longer using RBD, i do not have time to work on this. Putting this here so that someone can take it from here.

[humblec]

@krmayankk would you like to send a PR on this ?

[Madhu-1]

PVC name can be passed to CSI driver from external-provisioner kubernetes-csi/external-provisioner#399, this can be easily done I believe, we need to decide to add it to metadata or store the pvcname-backend image mapping in omap.

[chenxu1990]

I think it is fine to store it in metadata. What is the pros by storing in omap ? @Madhu-1

[ShyamsundarR]

I think it is fine to store it in metadata. What is the pros by storing in omap ? @Madhu-1

We also have the use case of RBD-Mirroring and would need a similar manner to do this for CephFS subvolumes.

Currently we are thinking along the lines of naming the image with the required pvcname-namespace-<uuid> or similar constructs. Leveraging image metadata, would mean leveraging xattrs for subvolumes in the CephFS space (or similar).

The desire would be to create a common manner of accessing the metadata, and a conclusion on the approach is not yet made. We may need more time to decide on this as we work through some of the other issues and features.

[stale]

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