This is exactly how the list implementation in the Linux kernel works [1]. I've extracted this header file and used it in user-space before, too. The cool trick is in calculating an offset to the start of the struct containing the link.

But I do not think this trick or list implementation is newly introduced in Wayland. It existed at least as far back as kernel 2.6.11 [2].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

[2] https://elixir.bootlin.com/linux/v2.6.11/source/include/linu...