lvextend doesn't work ?

edit

Hi,

So I've run into a shortage of space for my system-root. I am using LVM. I used gparted to shrink one partition by 10gb, and tried to add these to my /dev/mapper/fedora-root using lvextend --size '+10gb' '/dev/mapper/fedora-root' I have a message telling me that System root size has been increased by 10gb, but when I reboot, it hasn't been. Is it because I used lvextend directly from my Fedora install ?

Thanks

Edit : Here is my parted -l : http://pastebin.com/6VsvcjB6 And df : http://pastebin.com/aHst4PEY