Amir Goldstein 0d8097526b ovl: refactor layer parsing helpers
[ Upstream commit 819829f0319a759e8a6ccb7e4f1113f3f9f07aa3 ]

In preparation for new mount options to add lowerdirs one by one,
generalize ovl_parse_param_upperdir() into helper ovl_parse_layer()
that will be used for parsing a single lower layers.

Suggested-by: Miklos Szeredi <miklos@szeredi.hu>
Link: https://lore.kernel.org/r/CAJfpegt7VC94KkRtb1dfHG8+4OzwPBLYqhtc8=QFUxpFJE+=RQ@mail.gmail.com/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Stable-dep-of: 2824083db76c ("ovl: Always reject mounting over case-insensitive directories")
Signed-off-by: Sasha Levin <sashal@kernel.org>
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