What is stored in a files inode on a Linux or unix system?

In native filesystems, the inode stores:

• the owner (userid and groupid)
• file type
• access permissions
• file access times (datetime file modified, accessed; datetime inode modified)
• number of links to the file
• table of disk addresses for the blocks used by the data of the file
• file size

Directories are special files which contains a mapping linking names to an inode.

In many filesystems, short data can be stored in the directory.