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Computer system method and apparatus providing for various versions of a file without requiring data copy or log operations

  • US 5,761,677 A
  • Filed: 01/03/1996
  • Issued: 06/02/1998
  • Est. Priority Date: 01/03/1996
  • Status: Expired due to Term
First Claim
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1. In a computer having an operating system including a file system, for executing an application program, a method of consistently storing user data from said application program into said file system comprising the computer implemented steps of:

  • A) receiving from said application program, an argument indicating that a version of an existing file is to be created;

    B) allocating a version index structure;

    C) copying from an original index structure into said version index structure, file storage block allocation information;

    D) connecting said version index structure to said original index structure of said existing file; and

    E) resetting a connection to said original index structure of said existing file from a record of a name of said existing file and connecting said record of said name of said existing file to said version index structure.

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