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I know it is a condition of hard links that they cannot span filesystems. Does this apply to NFS mounts? Given the following directory structure, would I be able to create a hard link in directory A that points to a file in directory B?
/root
/A
/B <-NFS mount
For example, I’d like to run ln /root/B/file.txt /root/A/linkedfile.txt
Well, since
/Bis a separate file system (a mounted NFS file system) you cannot make a hard link between it and/A, because they are not on the same file system.It’s because a hardlink doesn’t make a copy of the data put only a copy of the pointer to that data, so they have to be in the same “address space”.