f2fs: Squashed update from f2fs-stable

https://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs-stable.git
Branch: linux-3.4.y
Up to and including:
  f2fs: adjust other changes
  2ba43a590c3fd78b3d05edd49aab3d2c34ae7232

Change-Id: If67141f1a9d23e42bd972ad9aaef6e6aa3ac28b8
22 files changed