title: write error (file system full?) on fc 18
body: <p>I'm not able to edit any file on my linux machine. 
  I checked the free space available on my system,</p>
  
  <pre><code>    df -h
      Filesystem               Size  Used Avail Use% Mounted on
      devtmpfs                  16G     0   16G   0% /dev
      tmpfs                     16G   84K   16G   1% /dev/shm
      tmpfs                     16G   18M   16G   1% /run
      tmpfs                     16G     0   16G   0% /sys/fs/cgroup
      /dev/mapper/fedora-root   50G  4.9G   42G  11% /
      tmpfs                     16G   40K   16G   1% /tmp
      /dev/mapper/fedora-home  428G  428G     0 100% /home
      /dev/xvda1               477M   90M  358M  21% /boot
  </code></pre>
  
  <p>"/dev/mapper/fedora-home" is consuming complete memory, I'm not sure what this file signifies. How can I free the space consumed by this?</p>