如何识别文件在哪个存储设备中

Question

I'm developing a Java software that reads lots of possibly big files.

I'll try to parallelize it, so it reads in parallel files from different devices (HDD, SSD, flash drive, SMB, etc) and only 1 file at a time from each device. But for that I'd need to know in which device a given file is.

On Windows I guess I could just use substring its path for the drive letter, but for Linux I have no idea how that could be done. Is there a standardized way to do it?

Answer 1

The sun.nio.fs.UnixFileAttributes class, which is used for PosixFileAttributes , contains a st_dev field. Unfortunately, it is not public accessible, you might have to use reflection to get the value.

A different approach would be to call stat on the file and read the device id that way. Then you can use the device id to find out which device the file is on.

Also you might want to check the output of mount to check the paths you are using and where they are mounted on.