VFS由超级块、inode、dentry、vfsmount等结构来组成。 Linux系统中存在很多的文件系统，例如常见的**ext2,ext3,ext4,sysfs,rootfs,proc...**等等。 从用户的使用角度，Linux下的文件系统中宏观上主要分为三层： 1.上层的文件系统的系统调用（System-call ）； 2.虚拟文件系统VFS ...

The following distilled code snippet shows how a stackable null-mode pass-through filesystem called Wrapfs handles the ->unlink() operation: int wrapfs_unlink(struct inode *dir, struct dentry *dentry) ...

Exceptions include cases where parent directories time out, such as in distributed filesystems like NFS. Figure 4. dentry Hash Table Each dentry references its inode using the d_inode pointer. This ...