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Methods and apparatus for updating file systems

  • US 20040093359A1
  • Filed: 11/12/2002
  • Published: 05/13/2004
  • Est. Priority Date: 11/12/2002
  • Status: Abandoned Application
First Claim
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1. A computer-implemented method for maintaining a file system, said file system being configured to service file access requests between an application program and a first data storage subsystem, said file system including a first persistent module and a first transparently unloadable module, said first persistent module and said first transparently unloadable module being associated with said first data storage subsystem, comprising:

  • blocking, using said first persistent module, a first file access request made by said application program to said first data storage subsystem, said blocking including maintaining information pertaining to said first file access request at said first persistent module;

    unloading said first transparently unloadable module, said unloading rendering file access functionalities in said transparently unloadable module inaccessible to said first persistent module; and

    loading a first substitute transparently unloadable module to render file access functionalities in said first substitute transparently unloadable module accessible to said first persistent module, said first substitute transparently unloadable module being associated with said first data storage subsystem after said loading, wherein said first file access request made by said application program to said first data storage subsystem does not cause a generation of an error condition with respect to said application program while said first transparently unloadable module is unloaded and wherein said unloading of said first transparently unloadable module and said loading of said substitute transparently unloadable module are made without rebooting a computer associated with said file system.

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