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Short note on: I-node.

Mumbai University > Information Technology > Sem5 > Operating System

Marks: 5M

Year: Dec 14

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  • I-node is a data structure that keeps track of all the information about a file. You keep your information in a file and the OS stores the information about a file in an I-node.

  • Data structures that contain information about files in UNIX file systems that are created when a file system is created.

  • Each file has an I-node and is identified by an I-node number (I-number) in the file system where it resides.

  • I-nodes provide important information on files such as user and group ownership, access mode (read, write, execute permissions) and type.

The I-node contains the following pieces of information:

  • Mode/permission (protection)

  • Owner ID

  • Group ID

  • Size of file

  • Number of hard links to the file

  • Time last accessed

  • Time last modified

  • Time I-node last modified

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