Boot into system rescue CD 
mount /dev/sda1 /mnt 
lvdisplay 
vgchange -ay 
xfs_repair /dev/centos/root 
xfs_repair /dev/centos/home 

IF REPAIR REQUIRES A MOUNT 
mount /dev/centos/root /mnt 
umount /mnt 
mount /dev/centos/home /mnt 
umount /mnt