The lab adds three empty spare disks: /dev/loop40 (256 MiB), /dev/loop41 (256 MiB) and /dev/loop42 (512 MiB). They come back at every boot, before file systems are mounted, so /etc/fstab lines for them keep working. It also creates user student (password Lab-Pass-1) if there isn't one.

Tasks

Create a VFAT file system on /dev/loop40, ext4 on /dev/loop41 and XFS on /dev/loop42, and mount them at /mnt/fat, /mnt/ext and /mnt/xfs. As root, create a file in each.
Mount the VFAT file system so that user student owns everything on it, and make that permanent: after a reboot, touch /mnt/fat/test works as student.
cd into /mnt/xfs in one shell and try to unmount it from another. Find out which program keeps it busy and write its name to /root/lab-answers/3. Then leave the directory and unmount /mnt/xfs.

Hints

mkfs.vfat (package dosfstools), mkfs.ext4, mkfs.xfs; mkdir -p, mount, lsblk -f.
uid= and gid= mount options for VFAT; a line in /etc/fstab (by UUID=), then systemctl daemon-reload and mount -a. chown doesn't work on VFAT.
fuser -vm /mnt/xfs, or lsof /mnt/xfs; findmnt /mnt/xfs.
The check mounts /dev/loop42 for a moment to look for your file if it isn't mounted. Mount /mnt/ext at every boot too if you reboot for task 2, or mount it again afterwards.