我有一些samba驱动器，每天都有多个用户访问。我已经有了识别共享驱动器(从SQL表)的代码，并将它们挂载到所有用户都可以访问它们的特殊目录中。
我想知道，如果我从我的SQL表中删除驱动器(有效地使其脱机)如何，甚至是，有一种方法来卸载繁忙的设备?到目前为止，我发现任何形式的umount都不起作用。
忽略破坏数据的可能性-是否有可能卸载当前正在读取的设备?
当前回答
看看umount2:
Linux 2.1.116 added the umount2() system call, which, like umount(), unmounts a target, but allows additional flags controlling the behaviour of the operation: MNT_FORCE (since Linux 2.1.116) Force unmount even if busy. (Only for NFS mounts.) MNT_DETACH (since Linux 2.4.11) Perform a lazy unmount: make the mount point unavailable for new accesses, and actually perform the unmount when the mount point ceases to be busy. MNT_EXPIRE (since Linux 2.6.8) Mark the mount point as expired. If a mount point is not currently in use, then an initial call to umount2() with this flag fails with the error EAGAIN, but marks the mount point as expired. The mount point remains expired as long as it isn't accessed by any process. A second umount2() call specifying MNT_EXPIRE unmounts an expired mount point. This flag cannot be specified with either MNT_FORCE or MNT_DETACH. Return Value On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
其他回答
是的! !有一种方法可以立即分离繁忙的设备-即使它繁忙且不能强制卸载。你可以稍后清理:
umount -l /PATH/OF/BUSY-DEVICE
umount -f /PATH/OF/BUSY-NFS (NETWORK-FILE-SYSTEM)
注意/警告
这些命令可能会中断正在运行的进程，导致数据丢失或损坏打开的文件。在强制卸载后，访问目标DEVICE/NFS文件的程序可能会抛出错误或无法正常工作。 不要在挂载路径(文件夹/驱动器/设备)内部执行以上umount命令。首先，您可以使用pwd命令验证您的当前目录路径(不应该是挂载路径)，然后使用cd命令退出挂载路径-稍后使用上述命令卸载它。
尝试下面的操作，但在运行之前请注意-k标志将终止所有使设备处于繁忙状态的正在运行的进程。
-i标志使fuser在kill前询问。
fuser -kim /address # kill any processes accessing file
unmount /address
使用exportfs -v检查导出的NFS文件系统。如果发现，使用exportfs -d share:/directory删除。这些不会在fuser/lsof列表中显示，并且会阻止umount成功。
看看umount2:
Linux 2.1.116 added the umount2() system call, which, like umount(), unmounts a target, but allows additional flags controlling the behaviour of the operation: MNT_FORCE (since Linux 2.1.116) Force unmount even if busy. (Only for NFS mounts.) MNT_DETACH (since Linux 2.4.11) Perform a lazy unmount: make the mount point unavailable for new accesses, and actually perform the unmount when the mount point ceases to be busy. MNT_EXPIRE (since Linux 2.6.8) Mark the mount point as expired. If a mount point is not currently in use, then an initial call to umount2() with this flag fails with the error EAGAIN, but marks the mount point as expired. The mount point remains expired as long as it isn't accessed by any process. A second umount2() call specifying MNT_EXPIRE unmounts an expired mount point. This flag cannot be specified with either MNT_FORCE or MNT_DETACH. Return Value On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
有人提到过，如果你正在使用终端，而你的当前目录在你想要卸载的路径中，你会得到错误。 作为补充，在这种情况下，你的lsof | grep path-to-be unmounted必须有以下输出:
bash ... path-to-be-unmounted
