[OpenAFS-devel] Initial implementation of RestrictedQuery, please comment

[Jeffrey Altman]

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On 3/19/2014 12:14 PM, Jeffrey Hutzelman wrote:
>> In this case a volume query or
>> a file query may be presented to the AFS cache manager by ID and the A=
FS
>> cache manager will have to query the volume location database by ID to=

>> retrieve the data.   The CM will use VL_GetEntryByName* to do so.
>=20
> OK, so Windows does not call VLGetEntryByID* either, then?

VL_GetEntryByID was not updated as part of the VL_*U RPC suite.
Anything that previously used VL_GetEntryByID now calls
VL_GetEntryByNameU with a numeric string.   The fileserver internally
calls the same internal function as VL_GetEntryByID in that case.

> This is sort of a moot point, since there is little purpose in
> restricting the by-id RPC interface when the necessarily-unrestricted
> by-name interface provides a superset of its functionality.

We are in complete agreement.

>> Semantics changes to RPCs in general should not take place.  New RPCs
>> should be issued if the behavior of the RPC is going to be modified.
>=20
> That's only necessary for _backward-incompatible_ changes, and not
> always even then.  Particularly for RPCs that have been around ~forever=
,
> making this determination can be challenging, but is sometimes
> necessary.  One of the changes proposed in this thread was for certain
> RPCs to return false volume names, possibly only to unauthenticated
> callers.  That's certainly a semantic change, and possibly a
> backward-incompatible one, but maybe not one that would actually break
> interoperability in a way we care about.  It's also a change that is
> completely pointless to do in a new RPC while leaving the old one
> alone. =20

Returning false volume names will break deployed code so that is not an
option.

Jeffrey Altman



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