prototypes/types for discussion Was: [AFS3-std] File Server/Cache Manager Extended Status Information

[Jeffrey Altman]

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Matt Benjamin wrote:
> Based on comments made in the previous round of discussion, which seems
> now to have died down, I'd like to suggest an interface for further
> discussion.
>
> The intention is not to innovate beyond the ideas for which there
> appeared to be consensus (supporting snippet included).
>
> Thanks to Tom Kaiser, for initial check-over and comments.
>
> Thanks,
>
> Matt
The devil is in the details.   While the XG might be beneficial to help 
you solidify your thoughts, I recommend that you focus on the English 
description of each message exchange and how it will be used. 

I do have two technical comments:

   1. I think the file server should be able to cancel the callback
      contract as part of the delivery of any event.
   2. The AFSCB_Event_XXX messages that you list parallel the RPCs made
      to the file server by clients.  However, they do not necessarily
      describe the notifications that need to be sent to the receiver of
      the callback.   An RXAFS_RemoveFile RPC effects two objects, the
      directory that contains the entry and the file that was removed.  
      At present there are two callbacks that are sent.  One for each
      object.   I think there needs to be two different messages there. 
      One describing the change to the directory object and the other
      describing the removal of the file.  Note that removal of the file
      is going to be a message that cancels the callback contract since
      the file will no longer exist.

Spending the time to produce an Internet Draft style document will make 
it a lot easier to determine what has been missed.   The XG can be an 
appendix to that document but it cannot be a replacement for it.

Jeffrey Altman



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