!3379 md: do not return existing mddevs from mddev_find_or_alloc

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/Y3S6BLLOQH7K5HXD762ADZB52A6D6VBO/ 
Do not return existing mddevs from mddev_find_or_alloc.

Christoph Hellwig (3):
  md: factor out a mddev_alloc_unit helper from mddev_find
  md: refactor mddev_find_or_alloc
  md: do not return existing mddevs from mddev_find_or_alloc


-- 
2.31.1
 
https://gitee.com/openeuler/kernel/issues/I8O6NL 
 
Link:https://gitee.com/openeuler/kernel/pulls/3379

 

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>