如果已经将存储设备挂载在特定目录路径下，那么根据根目录路径选择文件存储区域的筛选器表达式比较有用。
A filter expression to select file storage areas based on its root directory path can be useful if you have organized your storage devices to be mounted under specific directory paths.
根目录条目(dentry)对象也缓存在这里，因为它是文件系统所在的块设备。
The root directory entry (dentry) object is cached here also, as is the block device on which this file system resides.
它会提供一个foo0的参数给devfs_register，从而告诉内核应该在devfs名称空间的根目录创建一个新的foo0设备。
It would supply an argument of foo0 to devfs_register , thus telling the kernel that a new foo0 device should be created at the root of the devfs namespace.
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