Christoph Hellwig 85c8c3c1f8 md: factor out a mddev_alloc_unit helper from mddev_find
Split out a self contained helper to find a free minor for the md
"unit" number.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Song Liu <song@kernel.org>
2021-04-15 11:06:32 -07:00
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