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There are two divisions to this chapter.

  • The first section, MFS Introduction, provides basic information about what an MFS is and how it functions. The introductory section also describes how to install an MFS. Finally, this section contains general information about programming an MFS, which includes both general programming techniques as well as notes about specific MFS functions.

  • A second section, MFS Operations Reference, is a reference guide to all MFS functions. Described in the second section are all the arguments that an MFS can examine and modify for each filing system function supported in OpenInsight.

An MFS is a routine that stands between a file operation, such as READ or WRITE, and the filing system itself. The MFS routine has an opportunity to examine the data being used for a file operation, and to modify it before passing the data on to the filing system, or back to the program that requested the operation. In effect, an MFS is a shell around an existing filing system, one that monitors all input and output to that filing system.

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