File System in Operating System

File System in OS

A set of OS Services that provides Files and Directories for user applications is known as file system manager.

File:-A named, ordered collection of information.

File System:-A set of files and directories contained on a single drive. The raw data on the drive is translated to this abstract view of files and directories by the file system manager according to the specification of the file system standard.

The file manager administers the file system by:

1. Storing the information on a device
2. Mapping the block storage to a logical view
3. Allocating/deallocating storage
4. Providing directories

File Operations:-

• Creating a file
• Writing a File:-To write a file, we make a system call specifying both the
  name of the file and the information to be written to the file
• Reading a File
• Repositing withing a file
• Deleting a File
• Truncating a File

Types of File

File Attributes:-

• Name – only information kept in human-readable form
• Identifier – unique tag (number) identifies file within file system
• Type – needed for systems that support different types
• Location – pointer to file location on device
• Size – current file size
• Protection – controls who can do reading, writing, executing
• Time, date, and user identification – data for protection, security, and
  usage monitoring