Filesystem Project (FUSE + RAID)

Overview

This project implements a custom filesystem using FUSE (Filesystem in Userspace) with integrated RAID (Redundant Array of Independent Disks) capabilities. The filesystem supports RAID 0 (striping) and RAID 1 (mirroring), handling basic operations like file creation, deletion, reading, and writing.

The layout of a disk is shown below.

Features

• Create and remove files/directories.
• Read/write file contents with support for large files via indirect blocks.
• RAID 0 and RAID 1 functionality.
• Basic attributes (st_uid, st_gid, st_atime, st_mtime, st_mode, st_size) filled for files and directories.

Setup and Usage

1. Compile the Code

make

2. Initialize the Disks

truncate -s 1M <disk_name>

• 1M: 1 MB for simplicity
• disk_name: Your own disk pathname

3. Initialize the Filesystem

./mkfs -r <raid_mode> -d <disk_name1> -d <disk_name2> -i <num_inodes> -b <num_blocks>

• raid_mode: RAID type (0 for striping, 1 for mirroring, 1v for verified mirroring).
• disk_name1, disk_name2: Paths to disk images.
• num_inodes: Number of inodes.
• num_blocks: Number of data blocks (rounded to nearest multiple of 32).

Example:

./mkfs -r 1 -d <disk_name1> -d <disk_name2> -i 32 -b 224

4. Mount the Filesystem

./wfs <disk_name1> <disk_name2> [FUSE options] <mount_point>

• Use -s to disable multi-threading (mandatory).
• Use -f for running FUSE in the foreground (recommended for debugging).

Example:

./wfs disk1.img disk2.img -f -s mnt

5. Interact with the Filesystem

Once mounted, you can use standard file commands like mkdir, ls, echo, and cat to interact with the filesystem:

mkdir mnt/new_dir
ls mnt
stat mnt/new_dir
echo "Hello" > mnt/file.txt
cat mnt/file.txt

6. Unmount disk after done interacting

./umount.sh mnt

Example Workflow

truncate -s 1M disk1.img
truncate -s 1M disk2.img
./mkfs -r 1 -d disk1.img -d disk2.img -i 32 -b 224
mkdir mnt
./wfs disk1.img disk2.img -f -s mnt
stat mnt
mkdir mnt/test_dir
ls mnt
echo "data" > mnt/file.txt
cat mnt/file.txt
./umount.sh mnt