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Re: [Libguestfs] [PATCH nbdkit] protocol: Implement NBD_OPT_GO.



On Mon, Aug 6, 2018 at 5:46 PM Eric Blake <eblake redhat com> wrote:
On 08/06/2018 09:31 AM, Nir Soffer wrote:
> Eric, can you point us to the part of the spec allowing ignoring the export
> name sent by the client?

Nothing in the NBD spec requires the server to reject unknown export
names. So nbdkit never rejects export names (which means it behaves as
if all names work, regardless of whether or not it was the name it was
configured with, since it exports exactly one volume all the time).

The spec mention this about NBD_OPT_EXPORT_NAME:

   If the chosen export does not exist or requirements for the chosen export are not met
    (e.g., the client did not initiate TLS for an export where the server requires it), the
    server MUST terminate the session.

and for NBD_OPT_GO, we have NBD_REP_ERR_UNKNOWN:

    The chosen export does not exist on this server. In this case, the server SHOULD NOT
    send NBD_REP_INFO replies.

And the spec also says:

    If the server is unwilling to allow the export, it MUST terminate the session

Why would a server want to allow an export using different name? What is the point
of the export name in this case?

Again, if export name is not useful when a server export only one export, both server and
client can use the default empty export name.

Nir

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