I have this line in fstab:
/dev/sda3 / ext3 defaults 1 2
I supposed I should change it to:
/dev/sda3 / ext3 defaults,acl 1 2
I also suppose I should run:
mount -t ext3 -o acl /dev/sda3 /
Oh, but I get an error that it's already mounted or "/" is busy. How do I do this without crashing the system?