patch repository
http://repo.or.cz/w/ext4-patch-queue.git
git tree
http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
quilt patches
http://www2.kernel.org/pub/linux/kernel/people/tytso/ext4-patches