centos 7 无法进入系统 求大神解决

题主您好，

这个文档您可以参考一下：https://access.redhat.com/solutions/140543

是关于修复 xfs 文件系统的。

建议使用U盘恢复盘或者Live CD进入终端，获取root权限后进行修复。看楼主应该是用了LVM，先参照下列步骤：

# lvm pvscan
  PV /dev/sda1   VG rhel   lvm2 [96.00 MB / 0    free]
  Total: 1 [3.34 GB] / in use: 1 [3.34 GB] / in no VG: 0 [0 ]

# lvm vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "rhel" using metadata type lvm2

# lvm lvscan
  INACTIVE            '/dev/mapper/rhel-root' [3.34 GB] inherit

# lvm lvdisplay 

  --- Logical volume --- 
  LV Name                /dev/rhel/root 
  VG Name              rhel
  LV UUID                336qTi-Uguu-32O4-yQO7-xNON-eNON-biy0et 
  LV Write Access        read/write 
  LV Status              NOT available 
  LV Size                3.34 GB 
  Current LE             107 
  Allocation             inherit 
  Read ahead sectors     0 

# lvm vgchange -ay
  1 logical volume(s) in volume group "rhel" now active

然后尝试修复： xfs_repair /dev/mapper/rhel-root

如果还是不行，强制清理log后再修复： xfs_repair -L /dev/mapper/rhel-root