mount failed to set loopback device: no such file or directory

[yzj0911]

-rw-r--r-- 1 root root 98457092096 12月 9 12:27 datto dr----x--x 2 root root 4096 12月 9 17:29 mount

[root@localhost /]# mount datto mount/ mount: /opt/howlink/linkBackup/touch/pekhuv/datto：设置回环设备失败: 没有那个文件或目录

setup-snapshot /dev/mapper/centos-root /datto0 0 if=/datto0 of=datto bs=1M mount /datto0 /moutn is error