f2fs: add f2fs_may_inline_{data, dentry}

This patch adds f2fs_may_inline_data and f2fs_may_inline_dentry.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --cc fs/f2fs/f2fs.h
Simple merge

diff --cc fs/f2fs/file.c
Simple merge

diff --cc fs/f2fs/inline.c
Simple merge

diff --cc fs/f2fs/namei.c
Simple merge