XFS parent pointers

Oh right. I'm only worrying because I'm hacking up a replacement for GNU Stow that uses hardlinks where possible, unstowing by comparing the st_dev/st_ino of appropriately-located files in the target and stow tree, to reduce the visible behaviour change GNU stow and graft can cause with their huge symlink farms (since lots of programs care whether things are symlinks or not but almost none check their own read-only files to see what their link count is). If this works, systems that use it would end up with hundreds of thousands of files with link count 2.

However, I suspect that for your average file, two hardlinks is fine for inline storage of the parent pointers as well (inodes aren't *that* small). If a file has ten twenty or fifty hardlinks, I'd frankly *expect* parent pointers to be moved out of line. :)