[gentoo-user] How to verify stable system after fsck corrections

[Jake Moe]

The other night, my laptop decided it didn't want to start Gentoo
anymore.  Long story short, I ended up using fsck to fix the disk, after
which it booted ok.  However, the fsck was a bit destructive; at the
very least, a few files from my torrents had gone corrupt.  That's not a
big deal; Vuze lets me re-check all my torrents to make sure they're ok,
and I've re-downloaded the bits that weren't.  More worrysome is what
other files may be corrupt from the exercise.

My  question is: is there a way that Portage can compare what's
currently on the hard disk with what it installed, and do some sort of
checksum verification on it?  I'm going to assume not, unless I had
already generated my own checksums.  In that case, is the safest bet to
do an emerge -e world, and let it rebuild everything?  Or is there an
easier (i.e., shorter) way of doing it?

Thanks for your help.

Jake Moe