umount卸载
umount /dev/mapper/centos-home
删除home
lvremove /dev/centos/home
重新调整root的大小
lvextend -L 90G /dev/centos/root
xfs_growfs刷新root
xfs_growfs /dev/mapper/centos-root
将剩下的空间重新划分到home中
lvcreate -l+100%free -n home centos
格式化home
mkfs.xfs /dev/centos/home
重新挂载mount home
mount /dev/mapper/centos-home
