The iocb argument can usually be treated as an opaque cookie used by the AIO subsystem; if you need the struct file pointer for this file descriptor, however, you can find it as iocb->ki_filp.
通常可以把iocb看作AIO子系统使用的不透明数据结构。 然而，如果需要文件描述符的struct file指针，可以通过iocb->ki_flip获取。
Returns a struct containing a member named url, which provides the url of the file using either HTTP or FTP.
返回一个结构体，其中包含一个名为url的成员，该成员使用HTTP或ftp格式提供文件的url。
If the entry is a file, you print the name and the number of bytes it's currently using (found using the st_size member of the struct stat).
如果该条目是一个文件，那么显示其名称和字节数(可在struct stat的st_size成员中找到)。
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