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md: add a mddev_is_dm helper

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Add a helper to check for a DM-mapped MD device instead of using
the obfuscated ->gendisk or ->queue NULL checks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed--by: Song Liu <song@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240303140150.5435-4-hch@lst.de
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Christoph Hellwig 2024-03-03 07:01:42 -07:00 • committed by Song Liu
commit 176df894d7
6 changed files with 38 additions and 35 deletions
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