md/raid10: factor out dereference_rdev_and_rrdev()

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>
This commit is contained in:
Li Nan 2023-07-01 16:05:28 +08:00 • committed by Song Liu
commit b99f8fd2d9