f2fs: don't clear CP_QUOTA_NEED_FSCK_FLAG

If we met this once, let fsck.f2fs clear this only.
Note that, this addresses all the subtle fault injection test.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/checkpoint.c

@@ -1267,8 +1267,10 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 
 	if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
 		__set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
-	else
-		__clear_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
+	/*
+	 * TODO: we count on fsck.f2fs to clear this flag until we figure out
+	 * missing cases which clear it incorrectly.
+	 */
 
 	if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
 		__set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);