LFS201 - Chapter 16 Discussion // Questions // Banter

Referring to chapter 16 - Linux Filesystems and the VFS, I created a bash script to run the Demo: Filesystems

The script creates a 512M junk file filled with zeros, then creates a xfs file system inside, then mounts it. It then prints some info, unmounts and deletes the file.

#!/bin/bash
# xfs exercise

# Create file "junk" filled with zeros (512 Mbyte)
cmd="dd if=/dev/zero of=junk bs=1M count=512"
echo "$cmd"
${cmd}
echo -e "\n"

# Create a xfs file system inside junk
cmd="sudo mkfs.xfs junk"
echo "$cmd"
${cmd}
echo -e "\n"

# Mount the xfs file system to /mnt
# Note: there is no need for the -o loop option as Linux can figure out the
# loop file system by itself :-)
cmd="sudo mount junk /mnt"
echo "$cmd"
${cmd}
echo -e"\n"

# See if it's mounted
cmd="df"
echo "$cmd"
${cmd}
echo -e "\n"

# Here the output line relating to the xfs file system:
#/dev/loop0                 518816    30092    488724   6% /mnt

# Let's check if it's really a xfs file system:
cmd="grep xfs /proc/mounts"
echo "$cmd"
${cmd}
echo -e "\n"

# We could now create or copy content to the xfs file system, but we 
# unmount
cmd="sudo umount /mnt"
echo "$cmd"
${cmd}
echo -e "\n"

# and delete the file
cmd="rm junk"
echo "$cmd"
${cmd}

Perhaps you find it useful to play around or file the commands.