umount 强制卸载

umount -lf /mnt  强制卸载文件

-f     Force unmount (in case of an unreachable NFS system).  (Requires kernel 2.1.116 or later.)

 

-l     Lazy  unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as

              it is not busy anymore.  (Requires kernel 2.4.11 or later.)