我的 CIFS 驱动器出现了奇怪的问题。它在启动时无法挂载，而且在系统启动后，我再次尝试使用 mount -a 但没有成功。但是，当我卸载不存在的共享时，它会使用 mount -t 命令挂载（参见下面的代码）。当 df 和实际文件夹报告不同内容时，Ubuntu 似乎正在跟踪它已挂载。
这是在 Ubuntu 14.04 LTS 服务器上
我想说的是，这似乎是在我为该服务器为 KVM 添加桥接接口时开始的，所以我不确定这是否导致了这种情况。
john@Main-KVM:~$ sudo mount -a -vvv
mount: fstab path: "/etc/fstab"
mount: mtab path: "/etc/mtab"
mount: lock path: "/etc/mtab~"
mount: temp path: "/etc/mtab.tmp"
mount: UID: 0
mount: eUID: 0
mount: UUID=4449ee44-4389-4aa0-b47b-6ef85b43b7da already mounted on /boot
mount: UUID=FEFA-B2F0 already mounted on /boot/efi
mount: //192.168.0.10/Public/public already mounted on /home/john/UN_RAID
nothing was mounted
john@Main-KVM:~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/Main--KVM--vg-root 222912116 116356924 95208864 55% /
none 4 0 4 0% /sys/fs/cgroup
udev 8192876 4 8192872 1% /dev
tmpfs 1641356 1156 1640200 1% /run
none 5120 0 5120 0% /run/lock
none 8206772 4 8206768 1% /run/shm
none 102400 0 102400 0% /run/user
/dev/sda2 241965 97760 131713 43% /boot
/dev/sda1 523248 3468 519780 1% /boot/efi
/home/john/.Private 222912116 116356924 95208864 55% /home/john
john@Main-KVM:~$ sudo umount /home/john/UN_RAID
umount: /home/john/UN_RAID: not mounted
john@Main-KVM:~$ sudo mount -a -vvv
mount: fstab path: "/etc/fstab"
mount: mtab path: "/etc/mtab"
mount: lock path: "/etc/mtab~"
mount: temp path: "/etc/mtab.tmp"
mount: UID: 0
mount: eUID: 0
mount: UUID=4449ee44-4389-4aa0-b47b-6ef85b43b7da already mounted on /boot
mount: UUID=FEFA-B2F0 already mounted on /boot/efi
mount: spec: "//192.168.0.10/Public/public"
mount: node: "/home/john/UN_RAID"
mount: types: "cifs"
mount: opts: "guest,rw,iocharset=utf8,file_mode=0777,dir_mode=0777"
mount: external mount: argv[0] = "/sbin/mount.cifs"
mount: external mount: argv[1] = "//192.168.0.10/Public/public"
mount: external mount: argv[2] = "/home/john/UN_RAID"
mount: external mount: argv[3] = "-v"
mount: external mount: argv[4] = "-o"
mount: external mount: argv[5] = "rw,guest,iocharset=utf8,file_mode=0777,dir_mode=0777"
mount.cifs kernel mount options: ip=192.168.0.10,unc=\\192.168.0.10\Public,iocharset=utf8,file_mode=0777,dir_mode=0777,user=,prefixpath=public,pass=********
nothing was mounted
john@Main-KVM:~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/Main--KVM--vg-root 222912116 116356924 95208864 55% /
none 4 0 4 0% /sys/fs/cgroup
udev 8192876 4 8192872 1% /dev
tmpfs 1641356 1156 1640200 1% /run
none 5120 0 5120 0% /run/lock
none 8206772 4 8206768 1% /run/shm
none 102400 0 102400 0% /run/user
/dev/sda2 241965 97760 131713 43% /boot
/dev/sda1 523248 3468 519780 1% /boot/efi
/home/john/.Private 222912116 116356924 95208864 55% /home/john
//192.168.0.10/Public/public 9523094052 5631232832 3891861220 60% /home/john/UN_RAID
这是它当前在我的 fstab 文件中的显示方式。
//192.168.0.10/Public/public /home/john/UN_RAID cifs guest,rw,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0