求助：lfs无法正常启动，fsck.ext3

fsck.ext3: No such file or directory while trying to open /dev/sda7
/dev/sda7:
The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>

上网google了下，一般说是内核编译的问题，在setup general-->Create deprecated sysfs files 钩掉，仍然无法启动。

通过mke2fs -n /dev/sda7,再e2fsck -b n /dev/sda7
check完后，reboot错误仍旧。

请路过的帮忙看看。
谢谢！

犯了低级错误了，fstab。