Android S Beta 1
Merge remote-tracking branch 'aosp/upstream-master' into aosp

* aosp/upstream-master:
  f2fs_io: Add get file name encryption mode
  f2fs-tool: increase debug level from 0 to 1 in migrate_block
  resize.f2fs: fix to check free space before shrink
  resize.f2fs: fix wrong sit/nat bitmap during rebuild_checkpoint()
  resize.f2fs: add force option to rewrite broken calculation
  resize.f2fs: fix wrong ovp calculation
  Add -P option to preserve file owner
  libf2fs: fix memory leak caused by get_rootdev()
  mkfs.f2fs: add VM disk files to hot data types

Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I63d16dfdb5d31e9ee15e2c26e9ab5c0c63edb947