xfs_repair 修复 CentOS 7 Metadata corruption detected 启动失败问题

一VMware虚拟机，CentOS7系统，启动后未能成功进到系统，提示 Corruption of in-memory data detected, shutting down filesystem, please umount the filesystem and rectify the problem.

过程：

1.CentOS7启动失败，自动转到急救模式

2.journalctl -xe # 查看错误日志，提示 /dev/mapper/cl-root 挂载失败

3.mount /dev/mapper/cl-root /dmnt # 尝试手动挂载，失败。提示 Structure needs cleaning

4.xfs_replair -L /dev/mapper/cl-root # 尝试重建

5.init 6 # 重建log后，重启机子，正常了

参考：

• https://serverfault.com/questions/777299/proper-way-to-deal-with-corrupt-xfs-filesystems
• https://prasadlinuxblog.wordpress.com/2017/12/26/xfs_check-and-xfs_repair-of-lvm-under-rescue-mode-on-centos-7-oraclelinux-7/
• https://forums.unraid.net/topic/42059-failed-disk-and-possible-xfs-repair/