diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 68df44a..1674f2f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -885,8 +885,13 @@
 	spin_lock_init(&sbi->stat_lock);
 
 	mutex_init(&sbi->read_io.io_mutex);
-	for (i = 0; i < NR_PAGE_TYPE; i++)
+	sbi->read_io.sbi = sbi;
+	sbi->read_io.bio = NULL;
+	for (i = 0; i < NR_PAGE_TYPE; i++) {
 		mutex_init(&sbi->write_io[i].io_mutex);
+		sbi->write_io[i].sbi = sbi;
+		sbi->write_io[i].bio = NULL;
+	}
 
 	init_rwsem(&sbi->cp_rwsem);
 	init_waitqueue_head(&sbi->cp_wait);