f2fs: fix to tag gcing flag on page during file defragment

In order to garantee migrated data be persisted during checkpoint,
otherwise out-of-order persistency between data and node may cause
data corruption after SPOR.

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

fs/f2fs/file.c

@@ -2602,6 +2602,7 @@ do_map:
 			}
 
 			set_page_dirty(page);
+			set_page_private_gcing(page);
 			f2fs_put_page(page, 1);
 
 			idx++;