chenqiuhao1997

I have updated my code to meet the OpenZFS [code style requirements](https://github.com/openzfs/zfs/blob/master/.github/CONTRIBUTING.md#coding-conventions). Is there anything else I need to do before merging the PR?

Do you have any more suggestions? @youzhongyang We feel that this is a serious bug. It makes zfs inevitably hang on write requests without hardware problems when there are lots...

@amotin Thanks for your reply. We have found the macro `P2ALIGN_TYPED` before, but we have no idea of which option below is better. 1. Replace `P2ALIGN` with `P2ALIGN_TYPED` where necessary....

@youzhongyang Thanks for your suggestion. I have finished option 2 and updated the title and description of this PR. Please review it when you have time. Thanks a lot.

> @chenqiuhao1997 could you rebase this and force update the PR. That will let us a get a clean CI run so this can be merged. @behlendorf the rebased commit...