!406 [sync] PR-399: Backport fs, block and net bugfixes

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/399 
 
Pull fs bugfixes from Zhihao Cheng and ZhaoLong Wang
block bugfix from Yu Kuai
net bugfixes from Liu Jian 
 
Link:https://gitee.com/openeuler/kernel/pulls/406

 

Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>