As far as I can deduce nothing untoward will happen as a result from the three(!) commands (you omitted the file system check)
Code:
tune2fs -O^has_journal /dev/hdxx
e2fsck /dev/hdxx
tune2fs -j /dev/hdxx
Reason: the journal is syncing its data every 5 seconds in the default setting (or did you change that?). So your data were either written out of that journal or there is a small chance that they are corrupt
in that journal. In the latter case you don't know which state your files are in anyhow. If you know what you did last, you might take a look at files open during the change in your file system from rw to ro and try to find out the state they are in.
Much less trouble would be: back up or clone the partition and unleash
those commands. If all is well -- okay, else you have that backup and you'll have to restore from there.