Lecture22 - Note changes in the Calendar Monday, May 18...

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Monday, May 18 Monday, May 18 Note changes in the Calendar Note changes in the Calendar Project #3 Project #3 Scores are  Scores are  posted posted     delayed delayed Comments? Comments? Guest Speaker: Greg Kroah-Hartman Guest Speaker: Greg Kroah-Hartman Friday Friday  in class  in class Very important … do not miss Very important … do not miss Project #4 Project #4 Plan of Attack due by midnight  Plan of Attack due by midnight  Friday, May 22 Friday, May 22 Rob's Seminar Rob's Seminar Wednesday, May 27  Wednesday, May 27  in class in class Engineering Expo / Industry Advisory Board Engineering Expo / Industry Advisory Board Comments? Comments?
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Today’s topics Today’s topics More File Systems More File Systems
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File System  Directories Directory : a collection of nodes containing  information about files/sub-directories. Both the directory structure and the files  reside on secondary storage. An operating system attaches to a file  system’s directory structure by  mounting   the file system More later on this
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Directory Structure A directory is an  Abstract Data Type Attributes Operations Access methods
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Directory  Attributes Name  Date last accessed Date last updated Owner ID Protection information etc.
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Directory  Operations Search for a file Create a file Delete a file List a directory Rename a file Traverse the file system etc.
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Organize the Directory (Logically)  to Obtain Efficiency  – locating a file quickly. Naming  – convenient to users. Two users can have same name for different  files. The same file can have several different  names. Grouping  – logical grouping of files by  properties, (e.g., all Java programs, all  games, …)
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Tree-Structured Directories
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Tree-Structured Directories Efficient searching Recursive traversals/operations
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Lecture22 - Note changes in the Calendar Monday, May 18...

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