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So it can be used for parsing the Opt_lowerdir.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Link: https://lore.kernel.org/r/20240705011510.794025-2-chengzhihao1@huawei.com

Signed-off-by: Christian Brauner <brauner@kernel.org>