This patch uses ->writepage of meta mapping in sync_meta_pages instead of
f2fs_write_meta_page, by this way, in its caller we can ignore any changes
(e.g. changing name) of this registered function.
Signed-off-by: NChao Yu <chao2.yu@samsung.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>