Virtq refactor #1174
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Virtq refactor #1174
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cagatay-y
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Transfer was a wrapper around TransferToken, which in turn is a wrapper around BufferToken with the state of the transfer and the queue which the transfer is to be returned. The receiving queues do not need a reference to themselves and the transfer state is no longer needed as a variable since we do not share the transfer with the caller while the transfer in process. As a result, we are able to replace the uses of Transfer with BufferToken. Most methods on Transfer are also wrappers around the underlying BufferToken and could be removed in entirely. Those that didn't have an exact analogue in the implementation of BufferToken were moved there.
The TransferState was needed to check the status of the Transfer when it was shared between the caller and the callee. However, this is no longer the case and the caller cannot access a in-progress transfer anymore. Thus, the related checks are no longer needed and the field is no longer necessary.
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