/dev/mapper/root: clean, 29520/1210048 files, 190356/2419413 blocks
/dev/sda3:
The superblock could not be read or does not describe a correct ext2 filesystem
If the device is valid and it really contains an ext2 filesystem (and not swap ot ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device>

Sen orkar jag inte skriva mer :(