root@ubuntu:~# fsck -f /dev/ubuntu-vg/root
fsck from util-linux 2.20.1
e2fsck 1.42.5 (29-Jul-2012)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/ubuntu--vg-root: 208611/14196736 files (0.2% non-contiguous), 2562097/56756224 blocks