!8252 sysv: don't call sb_bread() with pointers_lock held

Merge Pull Request from: @ci-robot 
 
PR sync from: Yifan Qiao <qiaoyifan4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/XNYN55A7Z7E5EL3FKH3PX3F2VQUQ5WCF/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9QGIO 
 
Link:https://gitee.com/openeuler/kernel/pulls/8252

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>