FSCK

— run to find out the hd location.
df -hT

— as root
init 1
umount /dev/sda4 — change to each of your mapped entries above

fsck -NVr — for a trail run
fsck -Vr to actually fix

if you are presented with warning about unmount drive go to above and unmount.
Without specifying a partition to check all partitions in fstab are checked. Make sure they are all unmounted first. You are warned if a check on a mounted drive is going to be performed.

then either

reboot
shutdown -r now

or
init 6

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