VFS是底层文件系统的主要接口。
The VFS is the primary interface to the underlying file systems.
底层文件描述符被关闭时被触发。
Emitted when the underlying file descriptor has been closed.
和文件存储区域一样，固定存储区域使用底层文件系统上的目录结构。
Like file storage areas, fixed storage areas use a directory structure on the underlying file system.
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