Description: This procedure for the secondary file system, while the realization of the basic functions. Users through the file system provided by system calls to achieve the operation of the document. Using the most basic file operations: create a file, on a paper, reading documents, writing paper. The file system can be divided into three levels, and its bottom is the objects and their attributes middle layer is the manipulation of objects and collections management software the most high-level file system is available to support the interface. This procedure basically realize functions such as user login, file directory lists, create/delete files, create/delete subdirectories and so on.
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