!970 [sync] PR-903: backport block bugfix

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/903 
 
This patch series fix block layer bug.
3 patchs fix iocost bug. Other patchs fix raid10 and badblocks bug.
 
 
Link:https://gitee.com/openeuler/kernel/pulls/970

 

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