Comment 58 for bug 344878

The way the patch is currently setup you don't need a new ecryptfs-utils, but I think that will likely change before the final iteration. If you want to test this in a fedora kernel you will need to pull the patch from the git repo and apply it to the fedora kernel and build.

pulling the patch out of the git tree is relatively simple
git clone git://kernel.ubuntu.com/jj/ubuntu-natty.git
cd ubuntu-natty.git
git format-patch HEAD^

this will drop a patch file in the directory 0001-EcryptFS-Add-support-for-file-names-that-are-too-lon.patch (or something similar) and then you can apply this to the fedora kernel