For OpenAFS+OSD, it would be helpful for the clients to identify OSD capable fileservers early. Codepaths can then be separated more easily for OSD access vs. normal fileserver access.

Similarly, fileservers can store a hint about clients that are OSD capable, and send OSD-related data only to those. Other clients will (as is the case already) be forwarded actual file data instead of being supplied with OSD metadata.

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