Each unique mount instance of a file system object is represented by a virtual file system structure.
文件系统对象的每个唯一的装入实例通过一个虚拟文件系统结构进行表示。
A mount object that neither propagates nor receives a mount event is called a private mount.
既不传播也不接收挂载事件的挂载对象称为私有挂载(private mount)。
One other specialized mount object is called an unbindable mount, which is like a private mount but also disallows bind mounting itself.
另一种特殊的挂载对象称为不可绑定的挂载(unbindable mount)，它们与私有挂载相似，但是不允许执行绑定挂载。
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