如何修复 CentOS？挂载 /sysroot 失败

Question

我已经在我的机器上安装了 centOS 7，过去 4-5 个月我一直在使用它，它运行良好。但是几天前由于停电（不正确关闭），我的机器发生了一些不好的事情。现在，当我启动系统时，它一开始就给了我这条消息。

XFS (dm-0): Internal error XFS_WAIT_CORRUPTED at line 1600 of file fs/xfs/libxfs/xfs_alloc.c. Caller xfs_free_extent+0xf9/0x130 [xfs]
XFS (dm-0): Failed to recover EFIs

带有结束错误消息

...
Mounting /sysroot...
[  ***] A start job is running for /sysroot (3min 59s / 4min 31s)[240.527013] INFO: task mount:406 blocked for more than 120 seconds.
[  240.527056] "echo 0 > /proc/sys/kernel/hung_task_timeout+secs" disables this message."
[FAILED] Failed to mount /sysroot.
See 'systemctl status sysroot.mount' for more details.
[DEPEND] Dependency failed for Initrd Root File System.
[DEPEND] Dependency failed for Reload Configration from the Real Root.
[  OK  ] Stopped dracut pre-pivot and cleanup hook.
[  OK  ] Stopped target Initrd Default Target.
[  OK  ] Reached target Initrd File System.
[  OK  ] Stopped dracut mount hook.
[  OK  ] Stopped target Basic System.
[  OK  ] Stopped System Initialization.
         Starting Emergency Shell...

Genrating "/run/initramfs/rdsosreport.txt"

Entering emergancy mode. Exit the shell to continue.
Type "journalctl" to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to usb stick or /boot
after mounting them and attach it to a bug report.

:/#

可以解决这个问题

1. 修复此错误（损坏的文件）。
2. 重新安装（修复）整个操作系统。就像我们通常在 Windows 中所做的那样。

请指导如何执行上述任何一项操作来解决我的问题。

注意：如果有另一种方法可以在不丢失旧数据的情况下重新安装操作系统，请告诉我。

编辑：1 我用 live-cd 运行 xfs_repair，输出是

sudo xfs_repair -v /dev/dm-0

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

Phase 1 - find and verify superblock...
superblock read failed, offset 0, size 524288, ag 0, rval -1

fatal error -- Input/output error

Answer 1

就我而言，以下命令有所帮助。

sudo xfs_repair -v -L /dev/dm-0

我的节点在断电后无法启动，并收到错误“无法挂载 /sysroot”并进入紧急模式。

挂载和卸载失败，所以继续使用-L选项运行，这有助于我的节点再次启动。

Answer 2

听起来您需要运行XFS Repair。断电肯定导致文件系统处于错误状态。