ext4 defragmentation

src/freedombone-utils-filesystem

 function defrag_filesystem {
     fs_type=$(stat -f /)
 
+    if [[ "$fs_type" != *"btrfs"* && "$fs_type" != *"ext4"* ]]; then
+        return
+    fi
+
+    echo $'Defragmenting root directory'
+
     if [[ "$fs_type" == *"btrfs"* ]]; then
-        echo $'Defragmenting root directory'
-        btrfs filesystem defragment -r /
-        echo $'Defragmentation completed'
+        btrfs filesystem defragment -r -clzo /
     fi
+
+    if [[ "$fs_type" == *"ext4"* ]]; then
+        e4defrag /
+    fi
+
+    echo $'Defragmentation completed'
 }
 
 # NOTE: deliberately no exit 0