filesystems - 向 Unix 文件系统添加压缩的问题

Question

我正在修改操作系统课程，过去论文中的一个问题如下：

Some modern Unix filesystems support file-system internal compression.
That is, a file can be flagged so that within the filesystem, the file’s data
is compressed, although reading and writing to the file appears as normal
to users of the filesystem. What issues would you expect to have to be
addressed in adding compression to a traditional Unix filesystem?

我想不出任何需要解决的问题。谁能指出我正确的方向？谢谢

Answer 1

您的问题包含最初需要解决的问题-“尽管文件系统的用户对文件的读取和写入正常”。即压缩必须是透明的。另一个因素可能是使用的压缩算法必须足够快，以免在 I/O 期间压缩/解压缩文件时引入太多延迟。