We will be creating our own filesystem using fuse
Design and implement a simple file system with support for file creation, reading, writing, deletion, and Tree Structured directory management, considering key operating system principles.
Here are the tools and APIs used in this code: Standard C Library (#include<stdio.h>, #include<errno.h>, #include<stdlib.h>, #include<string.h>, #include<unistd.h>, #include<time.h>, #include<stddef.h>, #include<assert.h>): Standard C library functions for general-purpose programming. File Control (#include<fcntl.h>): Fcntl header file for file control operations. FUSE Library (#include<fuse.h>): Header file for the FUSE library, which provides functions like getattr and readdir for creating a FUSE-based file system. POSIX API (#include<unistd.h>): Header file for POSIX (Portable Operating System Interface) API functions.
- Macros (#define block_size 1024): Definition of a macro for the block size.
- Structures (struct Superblock, struct Inode, struct Node): Structures used for representing the superblock, inode, and node in the filesystem.
- fuse_main Function: Entry point for the FUSE-based file system. It initializes the superblock, creates the root node, and starts the FUSE file system.
COMMANDS :
Commands: Compilation command: cc -g -Wall -O2 -o fileSys fileStruct.c pkg-config fuse --cflags --libs
(Wall: enables all warnings || pkg-config finds the necessary compiler and linker flags for the FUSE library)
make all
To make mount: mkdir ~/mount_point
To Mount: ./fileSys -f ~/mount_point
Command to unmount: sudo umount -f ~/mount_point
FILESYSTEM FUNCTIONS:
cd ~/mount_point
ls, mkdir dir0 etc, echo less Simple >> file, less file
Echo is a Unix/Linux command tool used for displaying lines of text or string which are passed as arguments on the command line
Less command is a Linux utility that can be used to read the contents of a text file one page (one screen) at a time
The filesystem commands used: getattr: This function is called when you access information about a file or directory. $ ls -l /path/to/mounted/directory/file readdir: This function is called when you list the contents of a directory. $ ls /path/to/mounted/directory read: This function is called when you read the contents of a file. $ cat /path/to/mounted/directory/file mkdir: This function is called when you create a new directory. $ mkdir /path/to/mounted/directory/new_directory mknod: This function is called when you create a new file. $ touch new_file // Not implemented to show differernce write: This function is called when you write to a file. $ echo "content" > /path/to/mounted/directory/file