How to change lable partition on RHEL

When I want to change mount point in '/etc/fstab' in RHEL, if found it use Label to identified partition disk.

[root@tatshuya]# cat /etc/fstab
LABEL=/ / ext3 defaults 1 1
LABEL=/opt /opt ext3 defaults 1 2
LABEL=/usr /usr ext3 defaults 1 2
LABEL=/var /var ext3 defaults 1 2
LABEL=/boot /boot ext2 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda6 swap swap defaults 0 0

I want to change '/opt' to '/oracle'.

*** List existing label
[root@tatshuya]# e2label /dev/sda7
/opt

*** Change to new lable
[root@tatshuya]# e2label /dev/sda7 /oracle

*** List new label
[root@tatshuya]# e2label /dev/sda7
/oracle


-- TaTsHuYa --