System and method for using cached data at a local node after re-opening a file at a remote node in a distributed networking environment

  • US 4,897,781 A
  • Filed: 02/13/1987
  • Issued: 01/30/1990
  • Est. Priority Date: 02/13/1987
  • Status: Expired due to Term
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First Claim
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1. A system for determining the validity of data residing in a plurality of blocks in a client cache, of a client data processing system at a client mode, from a file residing in a server data processing system at a server node, wherein said server data processing system and said client data processing system are connected by means of a communications link, said system comprising:

  • means for determining, at the server node, a latest modification time of the file;

    means, in the client data processing system, for saving, corresponding to each of the blocks in the client cache, the latest determined modification time of the file, received from the server data processing system, when the file is closed at the client;

    means for recording, in the client data processing system, another determined latest modification time, received from the server data processing system, when said file is subsequently reopened at said client processing system; and

    means coupled to said saving means and said recording means for comparing, in the client data processing system, the latest determined modification time corresponding to one of said blocks with the recorded another determined latest modification time to determine the validity of said block.

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