Mumbai University > Information Technology > Sem5 > Operating System

Marks: 5M

Year: Dec 14

• 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