> Random side note: on MacOS, the kernel does know all the filenames of a hardlink, because hardlinks are secretly implemented as fancy symlink-like data struct

> Random side note: on MacOS, the kernel does know all the filenames of a hardlink, because hardlinks are secretly implemented as fancy symlink-like data structures. Note that the link is outdated and refers to HFS+. HFS+ originated in classic Mac OS and originally didn't support hard links at all, so they had to be added after the fact [1] using a hacky format based on a hidden directory. APFS has a cleaner design, but it still tracks the list of hard links to an inode. [2] [1] http://www.wsanchez.net/papers/USENIX_2000/ http://www.wsanchez.net/papers/USENIX_2000/ [2] https://developer.apple.com/support/downloads/Apple-File-System-Reference.pdf https://developer.apple.com/support/downloads/Apple-File-Sys..., search for "Siblings"