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md/raid10: factor out dereference_rdev_and_rrdev()
[ Upstream commit b99f8fd ] Factor out a helper to get 'rdev' and 'replacement' from config->mirrors. Just to make code cleaner and prepare to fix the bug of io loss while 'replacement' replace 'rdev'. There is no functional change. Signed-off-by: Li Nan <linan122@huawei.com> Link: https://lore.kernel.org/r/20230701080529.2684932-3-linan666@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org> Stable-dep-of: 6736434 ("md/raid10: use dereference_rdev_and_rrdev() to get devices") Signed-off-by: Sasha Levin <sashal@kernel.org>
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