修复磁盘解决不能写和清理结构问题

$ touch a.txt
touch: cannot touch 'a.txt': Read-only file system

$ cat /etc/fstab
/dev/mapper/lumi1--vg-root /               ext4    errors=remount-ro 0       1

boot           ext2    defaults        0       2
/dev/mapper/lumi1--vg-swap_1 none            swap    sw              0       0

$ sudo su
[sudo] password for lumi:

# mount -o rw,remount /
mount: cannot remount /dev/mapper/lumi1--vg-root read-write, is write-protected

# fsck -t ext4 /
fsck from util-linux 2.27.1
e2fsck 1.42.13 (17-May-2015)
/dev/mapper/lumi1--vg-root: recovering journal

# mount -o rw,remount /
mount: cannot remount /dev/mapper/lumi1--vg-root read-write, is write-protected