The file system will be handled as a block character device.
文件系统将被作为块字符设备来处理。
The root directory entry (dentry) object is cached here also, as is the block device on which this file system resides.
根目录条目(dentry)对象也缓存在这里，因为它是文件系统所在的块设备。
The loop device is a device driver that allows you to mount a file as a block device and then interpret the file system it represents.
loop 设备 是一个设备驱动程序，利用它可以将文件作为一个块设备挂载到系统中，然后就可以查看这个文件系统中的内容了。
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