It first looks to see whether it has a database entry matching both the path and device and inode number from the request.
它首先查看是否有一个与来自请求的路径、设备和inode号相匹配的数据库条目。
The first layer of defense is that queries to the database always include the file type and mode bits from the real file on disk, not just the device and inode.
第一层防御是在数据库的查询中总是包含文件类型和来自磁盘上实际文件的模式位 (mode bits)，而不只包含文件的设备和 inode 号。
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