The file object refers to a dentry object, which refers to an inode.
file对象引用dentry对象，后者引用inode。
When a dentry object exists, an inode object will also exist in the inode cache.
如果存在一个dentry对象，那么inode缓存中也将存在一个inode对象。
The hierarchical nature of a file system is managed by another object in VFS called a dentry object.
文件系统的层次结构由VFS中的另一个称为dentry的对象管理。
The hierarchical nature of a file system is managed by another object in VFS called a dentry object.
文件系统的层次结构由VFS中的另一个称为dentry的对象管理。
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