Root FS Read only: Remounting gives "cannot change data mode on remount" when not changing data mode

After messing with the settings in fstab, my root filesystem is being mounted read-only.

I was able to solve this error in the past by running

# remount -o remount,rw /

However, I am getting the error "cannot change data mode on remount". I understand that this means that the "data=" option does not match between the mounting and remounting. The problem is, no matter what option I give for the data mode, it gives this same error.

According to mount, / is mounted as ro,relatime,data=ordered. However -o remount,rw,data=ordered gives the same error.

According to /etc/fstab, / is supposed to be mounted as discard,errors=remount-ro,noatime,data=writeback. However -o rmount,rw,data=writeback gives the same error.

even data=joual has the same error.

I have also tried to enable and disable other options listed in mount and /etc/fstab, but nothing will cause mount to do anything other than output this error.

How to I remount this drive as read-write? What is causing this nonsensical error?

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