mount之后super block checksum不对

现象

    [home]# mount  /dev/sda  test
    EXT4-fs (sda): warning: mounting fs with errors, running e2fsck is recommended
    [home]# dmesg
    EXT4-fs (sda): warning: mounting fs with errors, running e2fsck is recommended
    EXT4-fs (sda): Errors on filesystem, clearing orphan list.
    EXT4-fs (sda): recovery complete
    EXT4-fs (sda): mounted filesystem with ordered data mode. Quota mode: none.
    [home]# debugfs /dev/sda
    debugfs 1.46.5 (30-Dec-2021)
    Checksum errors in superblock!  Retrying...

期望的现象

checksum正常

Hi cool-water, welcome to the openEuler Community.
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If you have any questions, please contact the SIG: Kernel, and any of the maintainers: @Xie XiuQi , @YangYingliang , @成坚 (CHENG Jian) , @jiaoff , @AlexGuo , @hanjun-guo , @woqidaideshi , @zhengzengkai , @Jackie Liu , @Zhang Yi , @colyli , @ThunderTown , @htforge , @Chiqijun , @冷嘲啊 , @zhujianwei001 , @kylin-mayukun , @wangxiongfeng , @Kefeng , @SuperSix173 , @WangShaoBo , @Zheng Zucheng , @lujialin , @陈结松 , @刘恺 , @whoisxxx , @wuxu_buque , @koulihong , @柳歆 , @朱科潜 , @Xu Kuohai , @Lingmingqiang , @juntian , @OSSIM , @郑振鹏 , @刘勇强 , @yuzenghui , @Qiuuuuu , @xiehaocheng , @chen wei , @CTC-Xibo.Wang , @Jason Zeng , @Yuehaibing , @guzitao , @zhanghongchen

ext4_orphan_cleanup：

2721         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2722                 /* don't clear list on RO mount w/ errors */
2723                 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2724                         ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2725                                   "clearing orphan list.\n");
2726                         es->s_last_orphan = 0;  
--> 这里会修改超级块的数据但是不会更新checksum最终可能挂载之后也不会有机会更新checksum 
这就导致内存中一直残留着的超级块checksum是错误的
2727                 }
2728                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2729                 return;
2730         }

复现方式：
一、构造一个有孤儿链表并且有错的镜像

/sdat@localhost home]# mkfs.ext4 -F -E lazy_itable_init=0  -O metadata_csum /dev/sda 
mke2fs 1.46.5 (30-Dec-2021)
/dev/sda contains a ext4 file system
        last mounted on /home/test on Thu Jun  9 14:21:22 2022
Discarding device blocks: done
Creating filesystem with 262144 4k blocks and 65536 inodes
Filesystem UUID: 8ad7fb1e-4c44-4959-93b0-3653c75f3cdd
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376

Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

[root@localhost home]# mount  /dev/sda  test
[root@localhost home]# mkdir  test/orphan
[root@localhost home]# cd test/orphan/
[root@localhost orphan]# rmdir ../orphan/
[root@localhost orphan]#  echo 1 > /sys/fs/ext4/sda/trigger_fs_error
[  383.550331] EXT4-fs error (device sda): trigger_test_error:125: comm bash: 1
[root@localhost orphan]# sync
[root@localhost orphan]# QEMU: Terminated

构造好之后可以把这个镜像备份一份，后面复现和回归可以一直使用该镜像

二、复现问题

[root@localhost home]# mount /dev/sda test
[  209.355600] EXT4-fs (sda): warning: mounting fs with errors, running e2fsck is recommended
[root@localhost home]# tune2fs -l /dev/sda
tune2fs 1.46.5 (30-Dec-2021)
tune2fs: Superblock checksum does not match superblock while trying to open /dev/sda
Couldn't find valid filesystem superblock.

src-openEuler / kernel

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mount之后super block checksum不对

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期望的现象

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src-openEuler / kernel