f2fs: update to lastest version for 3.4y

f2fs: cleanup if-statement of phase in gc_data_segment

Little cleanup to distinguish each phase easily

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
[Jaegeuk Kim: modify indentation for code readability]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

f2fs: fix to return correct error number in f2fs_write_begin

Fix the wrong error number in error path of f2fs_write_begin.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

f2fs: cleanup redundant macro

We've already made fi and sbi for inode. Let's avoid duplicated work.

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

f2fs: support 3.4

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: DerRomtester <dieb.stefan.96@gmail.com>